rne fundamentals b9 3fl11820

Section 1 - Module - 3FL 11820 ACAA Edition 1

All rights reserved © 2005, AlcatelEvolium BSS - RNE Fundamentals

3FL 11820 ACAA Edition 1

RNE Fundamentals


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Objectives

By the end of the course, participants will be able to: - Plan a standard GSM (single band and single layer)

network in urban, suburban and rural areas fulfillingdefined coverage probability;

- Choose suitable BTS site configurations for different clutter types: - Omni sites/sectorized sites, - Number of TRX, - Antenna height and antenna type, - Feeder cable. - Plan site locations: - To achieve planned coverage probability - Inter site distance Antenna azimuth and tilt.


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Objectives [cont.]



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Table of Contents

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1 Introduction 141.1 Standardisation & Documentation 15

1.1.1 www.3GPP.org organizational partners 161.1.2 TSG Organisation 171.1.3 Specifications and Releases 181.1.4 Specifications out of Release 1999 19

1.2 Radio Network Architecture 201.2.1GSM Network Architecture with out GPRS 211.2.2 GSM Network Architecture with GPRS 221.2.3 OMC-R 231.2.4 GSM Network Elements 241.2.5 RF Spectrum 25

1.3 Mobile Phone Systems 261.3.1 Access Methods 271.3.2 FDMA 281.3.3 TDMA 291.3.4 CDMA (Code Division Multiple Access) 301.3.5 Analogue Cellular Mobile Systems 311.3.6 AMPS (Advanced Mobile Phone System) 321.3.7 AMPS - Technical objectives 331.3.8 AMPS Frequency Range 341.3.9 TACS Total Access Communications System 351.3.10 TACS - Technical objectives 361.3.11 Different TACS-Systems 371.3.12 TACS (Total Access Communications System) 381.3.13 Why digital mobile communication ? 391.3.14 GSM - Technical objectives 401.3.15 DECT (Digital European Cordless Telephone) 411.3.16 DECT - Technical objectives 421.3.17 CDMA - Technical objectives 431.3.18 CDMA - Special Features 441.3.19 CDMA - Technical objectives 451.3.20 TETRA - Features 461.3.21 TETRA - Typical Users 471.3.22 TETRA - Technical objectives 481.3.23 Universal Mobile Telecommunication System 49

1.4 RNP Process Overview 501.4.1 Definition of RN Requirements 511.4.2 Preliminary Network Design 521.4.3 Project Setup and Management 531.4.4 Initial Radio Network Design 541.4.5 Site Acquisition Procedure 551.4.6 Technical Site Survey 561.4.7 Basic Parameter Definition 571.4.8 Cell Design CAE Data Exchange over COF 581.4.9 Turn On Cycle 591.4.10 Site Verification and Drive Test 601.4.11 HW / SW Problem Detection 611.4.12 Basic Network Optimization 621.4.13 Network Acceptance 631.4.14 Further Optimization 64

2 Coverage Planning 652.1 Geo databases 66

2.1.1 Why are geographical data needed for Radio Network Planning ? 672.1.2 Maps are flat 68


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Table of Contents [cont.]


2.1.3 Mapping the earth 692.1.4 Map Projection 702.1.5 Geodetic Ellipsoid 712.1.6 Global & Regional Ellipsoids 722.1.7 Geodetic Datum 732.1.8 Different Map Projection’s 742.1.9 Geo-Coordinate System 752.1.10 WGS 84 (World Geodetic System 1984) 762.1.11 Transverse Mercator Projection 772.1.13 Universal Transverse Mercator System 792.1.14 UTM - Definitions 802.1.15 UTM Zones (e.g. Europe) 812.1.16 UTM-System 822.1.17 UTM Zone Numbers 832.1.18 UTM-System: Example "Stuttgart" 842.1.19 Lambert Conformal Conic Projection 852.1.20 Geospatial data for Network Planning 862.1.21Creation of geospatial databases 872.1.22 Parameters of a Map 882.1.23 Raster- and Vectordata 892.1.24 Rasterdata / Grid data 902.1.25 Vectordata 912.1.26 Digital Elevation Model (DEM) 922.1.28 Morphostructure (2) 942.1.29 Morphoclasses 952.1.30 Morphoclasses (2) 962.1.31Background data (streets, borders etc.) 972.1.32 Orthophoto 982.1.33 Scanned Maps 992.1.34 Buildings 1002.1.35 Buildings (2) 1012.1.36 Traffic density 1022.1.37 Converting one single point (1a) 1032.1.38 Converting one single point (1b) 1042.1.39 Converting one single point (2a) 1052.1.40 Converting one single point (2b) 1062.1.41 Converting a list of points (3a) 1072.1.42 Converting a list of points (3b) 1082.1.43 Converting a list of points (3c) 1092.1.44 Provider for Geospatial data 1102.1.45 Links for more detailed infos 111

2.2 Antennas and Cables 1122.2.1 The Antenna System 1132.2.2 Antenna Theory 1142.2.3 Antenna Data 1152.2.4 Antenna Pattern and HPBW 1162.2.5 EIRP 1172.2.6 Linear Antennas 1182.2.7 Monopole Antenna Pattern 1192.2.8 Panel Antenna with Dipole Array 1202.2.9 Dipole Arrangement 1212.2.10 Omni Antenna 122


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2.3 Antenna Parameters 1232.3.1 X 65° T6 900MHz 2.5m 1242.3.2 X 65° T6 900MHz 1.9m 1252.3.3 X 90° T2 900MHz 2.5m 1262.3.4 V 65° T0 900MHz 2.0m 1272.3.5 V 90° T0 900MHz 2.0m 1282.3.6 X 65° T6 1800MHz 1.3m 1292.3.7 X 65° T2 1800MHz 1.3m 1302.3.8 X 65° T2 1800MHz 1.9m 1312.3.9 V 65° T2 1800MHz 1.3m 1322.3.10 V 90° T2 1800MHz 1.9m 133

2.4 Cable Parameters 1342.4.1 7/8" CELLFLEX® Low-Loss Coaxial Cable 1352.4.2 1-1/4" CELLFLEX® Coaxial Cable 1362.4.3 1-5/8" CELLFLEX® Coaxial Cable 1372.4.4 1/2" CELLFLEX® Jumper Cable 138

2.5 Radio Propagation 1392.5.1 Propagation effects 140

2.5.1.1 Reflection 1412.5.1.2 Refraction 1422.5.1.3 Diffraction 1432.5.1.4 Fading 1442.5.1.5 Fading types 1452.5.1.6 Signal Variation due to Fading 1462.5.1.7 Lognormal Fading 147

2.6 Path Loss Prediction 1482.6.1 Free Space Loss 1492.6.2 Fresnel Ellipsoid 1502.6.3 Fresnel Ellipsoid 1512.6.4 Knife Edge Diffraction 1522.6.5 Knife Edge Diffraction Function 1532.6.6 "Final Solution" for Wave Propagation Calculations? 1542.6.7 CCIR Recommendation 1552.6.8 Mobile Radio Propagation 1562.6.9 Terrain Modeling 1572.6.10 Effect of Morphostructure on Propagation Loss 1582.6.11 Okumura-Hata for GSM 900 1592.6.12 CORRECTIONS TO THE HATA FORMULA 1602.6.13 Hata-Okumura for GSM 900 1612.6.14 COST 231 Hata-Okumura GSM 1800 1622.6.15 Alcatel Propagation Model (Standard Propagation Model) 1632.6.16 Alcatel Propagation Model 1642.6.17 Exercise ‘Path Loss’ 165

2.7 Link Budget Calculation 1662.7.1 Maximum Propagation Loss (Downlink) 1672.7.2 Maximum Propagation Loss (Uplink) 1682.7.3 GSM900 Macro Evolium Evolution A9100 BTS 1692.7.4 GSM1800 Link Budget 1702.7.5 Additional Losses Overview 171


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2.8 Coverage Probability 1722.8.1 Indoor propagation aspects 1732.8.2 Indoor propagation: empirical model 1742.8.3 Indoor Penetration 1752.8.4 Body Loss (1) 1762.8.5 Body Loss (2) 1772.8.6 Body Loss (3) 1782.8.7 Interference Margin 1792.8.8 Degradation (no FH) 1802.8.9 Diversity Gain 1812.8.10 Lognormal margin 1822.8.11 Consideration of Signal Statistics (1) 1832.8.12 Consideration of Signal Statistics (2) 184

2.9 Cell Range Calcolation 1852.9.1 Calculation of Coverage Radius R 1862.9.2 Coverage Probability 1872.9.3 Coverage Ranges and Hata Correction Factors 1882.9.4 Conventional BTS Configuration 1892.9.5 Coverage Improvement by Antenna Diversity 1902.9.6 Radiation Patterns and Range 1912.9.7 Improvement by Antenna Diversity and Sectorization 1922.9.8 Improvement by Antenna Preamplifier 193

2.10 Antenna Engineering 1942.10.1 Omni Antennas 1952.10.2 Sector Antenna 1962.10.3 Typical Applications 1972.10.4 Antenna Tilt 1982.10.5 Mechanical Downtilt 1992.10.6 Electrical Downtilt 2002.10.7 Combined Downtilt 2012.10.8 Assessment of Required Tilts 2022.10.9 Inter Site Distance in Urban Area 2032.10.10 Downtilt in Urban Area 2042.10.11 Downtilt in Urban Area 2052.10.12 Downtilt in Suburban and Rural Area 2062.10.13 Antenna configurations 2072.10.14 Antenna Configurations for Omni and Sector Sites 2082.10.15 Three Sector Antenna Configuration with AD 2092.10.16 Antenna Engineering Rules 2102.10.17 Distortion of antenna pattern 2112.10.18 Tx-Rx Decoupling (1) 2122.10.19 TX-RX Decoupling (2) 2132.10.20 TX-RX Decoupling (3) 2142.10.21 Space Diversity 2152.10.22 Power Divider 2162.10.23 Power Divider 2172.10.24 Panel Configurations (1) 2182.10.25 Panel Configurations (2) 2192.10.26 Panel Configurations (3) 220


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2.10.27 Feeders 2212.10.28 Feeder Installation Set and Connectors 2222.10.29 Feeder Parameters 2232.10.30 Feeder attenuation (1) 2242.10.31 Radiating Cables 2252.10.32 Components of a radiating cable system 2262.10.33 Comparison of field strength: Radiating cable and standard antenna 2272.10.34 Example of a radiating cable in a tunnel 2282.10.35 Microwave antennas, feeders and accessories 2292.10.36 Parabolic antenna 2302.10.37 High performance antenna 2312.10.38 Horn antennas 2322.10.39 Specific Microwave Antenna Parameters (1) 2332.10.40 Specific Microwave Antenna Parameters (2) 2342.10.41 Data sheet 15 GHz 2352.10.42 Radiation pattern envelope 2362.10.43 Feeders (1) 2372.10.44 Feeders (2) 2382.10.45 Feeders (3) 2392.10.46 Feeders (4) 2402.10.47 Feeders (5) 2412.10.48 Antenna feeder systems (1) 2422.10.49 Antenna feeder systems (2) 2432.10.50 Antenna feeder systems (3) 244

2.11 Alcatel BSS 2452.11.1 Architecture of BTS - Evolium Evolution A9100 2462.11.2 EVOLIUMTM A9100 Base Station (1) 2472.11.3 EVOLIUMTM A9100 Base Station (2) 2482.11.4 EVOLIUMTM A9100 Base Station (3) 2492.11.5 EVOLIUMTM BTS Features (1) 2502.11.6 EVOLIUMTM BTS Features (2) 2512.11.7 Generic Configurations for A9100 G4 BTS 2522.11.8 Generic configurations for cabinets MBI (1) 2532.11.9 Generic configurations for cabinets MBI (2) 2542.11.10 Generic configurations for cabinets MBO (1) 2552.11.11 Generic configurations for cabinets MBO (2) 2562.11.12 TRX Types 2572.11.13 BTS Output Power 2582.11.14 Feature Power Balancing 2592.11.15 Cell Split Feature 2602.11.16 Influence of Cell Split feature on BTS configurations 2612.11.17 Cell Split Example: Deployment of multi-band cells 2622.11.18 Cell Split Example: Migration to multiband cells 2632.11.19 Cell Split Example: High Power Configuration 2642.11.20 Cell Split Example: Configuration extension 2652.11.21 Cell Split Example: Large configurations 2662.11.22 Indoor BTS Rack Layout 2672.11.23 Outdoor BTS Rack Layout 2682.11.24 3 Level Architecture 2692.11.25 Micro BTS types 2702.11.26 Technical Data 2712.11.27 Evolium™ BSC Characteristics 2722.11.28 BSC Architecture 2732.11.29 BSC Rack Layouts 274


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2.12 Coveradge Improvement 2752.12.1 Antenna Diversity 276

2.12.1.1 Diversity 2772.12.1.2 Selection Diversity (1) 2782.12.1.3 Selection Diversity (2) 2792.12.1.4 Selection Diversity (3) 2802.12.1.5 Equal Gain Combining (1) 2812.12.1.6 Equal Gain Combining (2) 2822.12.1.7 Maximum Ratio Combining (1) 2832.12.1.8 Maximum Ratio Combining (2) 2842.12.1.9 Comparison of combining methods 2852.12.1.10 Enhanced Diversity Combining (1) 2862.12.1.11 Enhanced Diversity Combining (2) 2872.12.1.12 Diversity systems in Mobile Radio Networks 2882.12.1.13 Space Diversity Systems 2892.12.1.14 Space Diversity - General Rules 2902.12.1.15 Achievable Diversity Gain 2912.12.1.16 Polarization Diversity 2922.12.1.17 Principle of Polarization Diversity 2932.12.1.18 Air Combining 2942.12.1.19 Air Combining with Polarization Diversity 2952.12.1.20 Air Combining with Space Diversity 2962.12.1.21 Decoupling of Signal Branches 2972.12.1.22 Cross Polarized or Hor/Ver Antenna? (1) 2982.12.1.23 Cross Polarized or Hor/Ver Antenna? (2) 2992.12.1.24 Conclusion on Antenna Diversity 300

2.12.2 Repeater Systems 3012.12.2.1 Repeater Application 3022.12.2.2 Repeater Block Diagram 3032.12.2.3 Repeater Applications (2) 3042.12.2.4 Repeater Types 3052.12.2.5 Repeater for Tunnel Coverage 3062.12.2.6 Repeater for Indoor coverage 3072.12.2.7 Planning Aspects 3082.12.2.8 Repeater Gain Limitation (1) 3092.12.2.9 Repeater Gain Limitation (2) 3102.12.2.10 Intermodulation Products 3112.12.2.11 Repeater Link Budget 3122.12.2.12 High Power TRXs 3132.12.2.13 3x6 TRXs High Power Configuration 3142.12.2.14 Mixed TRX Configuration 315

3 Traffic & Frequency Planning 3163.1 Traffic Caspacity 317

3.1.1 Telephone System 3183.1.2 Offered Traffic and Traffic Capacity 3193.1.3 Definition of Erlang 3203.1.4 Call Mix and Erlang Calculation 3213.1.5 ERLANG B LAW (2) 3233.1.6 Erlang´s Formula 3243.1.7 Blocking Probability (Erlang B) 3253.1.8 BTS Traffic Capacity (Full Rate) 326


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3.2 Network Evolution 3273.2.1 Network Evolution - Capacity Approach (1) 3283.2.2 Network Evolution - Capacity Approach (2) 3293.2.3 Network Evolution - Capacity Approach (3) 3303.2.4 Network Evolution - Capacity Approach (4) 331

3.3 Cell Structures 3323.3.1 Cell Structures and Quality 3333.3.2 Cell Re-use Cluster (Omni Sites) (1) 3343.3.2 Cell Re-use Cluster (Omni Sites)(2) 3353.3.4 Cell Re-use Cluster (Sector Site) (1) 3363.3.5 4x3 Cell Re-use Cluster (Sector Site) (2) 3373.3.6 Irregular (Real) Cell Shapes 338

3.4 Frequency Reuse 3393.4.1 GSM Frequency Spectrum 3403.4.2 Impact of limited Frequency Spectrum 3413.4.3 What is frequency reuse? 3423.4.4 RCS and ARCS (1) 3433.4.5 RCS and ARCS (2) 3443.4.6 Reuse Cluster Size (1) 3453.4.7 Reuse Cluster Size (2) 3463.4.8 Reuse Distance 3473.4.9 Frequency Reuse Distance 3483.4.10 Frequency Reuse: Example 349

3.5 Cell Planning 3503.5.1 Cell Planning - Frequency Planning (1) 3513.5.2 Cell Planning - Frequency Planning (2) 3523.5.3 Influencing Factors on Frequency Reuse Distance 3533.5.4 Conclusion 3543.5.5 Examples for different frequency reuses 355

3.6 Interference Probabiliti 3563.6.1 Interference Theory (1) 3573.6.2 Interference Theory (2) 3583.6.3 CPDF - Cumulative Probability Density Function 3593.6.4 Interference Probability dependent on Average Reuse 360

3.7 Carrier Types 3613.7.1 Carrier Types - BCCH carrier 3623.7.2 Carrier Types - TCH carrier 363

3.8 Multiple Reuse Pattern MPR 3643.8.1 Meaning of multiple reuse pattern (1) 3653.8.2 Meaning of multiple reuse pattern (2) 3663.8.3 GSM restrictions 367

3.9 Intermodulation 3683.9.1 Intermodulation problems (1) 3693.9.2 Intermodulation problems (2) 3703.9.3 Intermodulation problems (3) - Summary 3713.9.4 Treating “neighbor” cells 3723.9.5 Where can I find neighbor cells? 373

3.10 Manual Frequency Planning 3743.10.1 Frequency planning (1) 3753.10.2 Frequency planning (2) 3763.10.3 Exercise: Manual frequency planning (1) 3773.10.4 Exercise: Manual frequency planning (2) 3783.10.5 Discussion: Subdivide Frequency Band? 3793.10.6 Hint for creating a future proofed frequency plan 3803.10.7 Implementing a frequency plan 381


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3.11 BSCI Planning 3823.11.1 BSCI allocation 3833.11.2 BSIC Planning Rules 3843.11.3 Spurious RACH 3853.11.4 Summary 386

3.12 Capacity Enhancement Techniques 3873.12.1 Capacity enhancement by planning 3883.12.2 Capacity enhancement by adding feature 3893.12.3 Capacity enhancement by adding TRX 3903.12.4 Capacity enhancement by adding cells 3913.12.5 Capacity enhancement by adding sites 392

4 Radio Interface 3934.1 GSM Air Interface 394

4.1.1 Radio Resources 3954.1.2 GSM Transmission Principles (1) 3964.1.3 GSM Transmission Principles (2) 3974.1.4 Advantages of Signal Processing 3984.1.5 Signal Processing Chain 399

4.2 Channel Coding 4004.2.1 Speech Coding 4014.2.2 Error Protection 4024.2.3 Interleaving and TDMA Frame Mapping 4034.2.4 Encryption 4044.2.5 Burst Structure 4054.2.6 Synchronisation 4064.2.7 Modulation 4074.2.8 Propagation Environment 4084.2.9 Equalizing 4094.2.10 Definition of Bit Error Rates 4104.2.11 Speech Quality 4114.2.12 Dependence of BER on Noise and Interference 4124.2.13 Frequency Hopping (1) 4134.2.14 Frequency Hopping (2) 4144.2.15 The OSI Reference Model 4154.2.16 GSM Burst Types (1) 4164.2.17 GSM Burst Types (2) 4174.2.18 Logical Channels 4184.2.19 Possible Channel Combinations 4194.2.20 Channel Mapping (1) 4204.2.21 Channel Mapping (2) 4214.2.22 TDMA Frame Structure for TCHs 422


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1 Introduction


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1 Intruduction

1.1 Standardisation & Documentation


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1.1.1 www.3GPP.org organizational partners

Project supported by ARIB Association of Radio Industries

and Businesses (Japan) CWTS China Wireless

Telecommunication Standard group ETSI European Telecommunications

Standards Institut T1 Standards Committee T1

Telecommunication (US) TTA Telecommunications

Technology Association (Korea) TTC Telecommunication

Technology Committee (Japan)

The Organizational Partners shall determine the general policy and strategy of 3GPP and perform the following tasks: Approval and maintenance of the

3GPP scope Maintenance the Partnership Project

Description Taking decisions on the creation or

cessation of Technical Specification Groups, and approving their scope and terms of reference

Approval of Organizational Partner funding requirements

Allocation of human and financial resources provided by the Organizational Partners to the Project Co-ordination Group

Source: www.3gpp.org


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TSG ORGANIZATION

Project Co-ordination Group(PCG)

TSG RANRadio Access Networks

RAN WG1Radio Layer 1 specification

RAN WG2Radio Layer2 &3 spec

RAN WG3UTRAN O&M requirements

RAN WG4Radio &Protocol Aspects

RAN WG5 (ex T1)Mobile TerminalTesting

TSG SAServices & System Aspects

SA WG1Services

SA WG2Architecture

SA WG3Security

SA WG4Codec

SA WG5Telecom Management

TSG CTCore Network & Terminals

CT WG1 (ex CN1)MM/CC/SM (lu)

CT WG3 (ex CN3)Networks Interworking

CT WG4 (ex CN4)MAP/GTP/BCH/SS

CT WG5 (ex CN5)Open Service Access

CT WG6 (ex T3)Card Application Aspects

TSG GERANGSM EDGE

Radio Access Network

GERAN WG1Radio Aspects

GERAN WG2Protocol Aspects

GERAN WG3Terminal TestingGERAN WG3Terminal Testing


1.1.2 TSG Organisation

Source: www.3gpp.org


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1.1.3 Specifications and Releases

GSM/Edge Releases: http://www.3gpp.org/specs/releases.htm TR 41.103 GSM Phase 2+ Release 5

• Freeze date: March - June 2002

TR 41.102 GSM Phase 2+ Release 4• Freeze date: March 2001

TR 01.01 Phase 2+ Release 1999• Freeze date: March 2000

For the latest specification status information please go to the 3GPP Specifications database: http://www.3gpp.org/ftp/Information/Databases/Spec_Status/The latest versions of specifications can be found on ftp://ftp.3gpp.org/specs/latest/

TS – Technical SpecificationTR – Technical Report


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1.1.4 Specifications out of Release 1999

TR 01.04 Abbreviations and acronyms TS 03.22 Functions related to Mobile Station (MS) in idle mode and group

receive mode TR 03.30 Radio Network Planning Aspects TS 04.04 Layer 1 - General Requirements TS 04.06 Mobile Station - Base Stations System (MS - BSS) Interface Data

Link (DL) Layer Specification TS 04.08 Mobile radio interface layer 3 specification TS 05.05 Radio Transmission and Reception TS 05.08 Radio Subsystem Link Control TS 08.06 Signalling Transport Mechanism Specification for the Base Station

System - Mobile Services Switching Centre (BSS-MSC) Interface TS 08.08 Mobile-services Switching Centre - Base Station system (MSC-

BSS) Interface Layer 3 Specification


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1 Intruduction

1.2 Radio Network Architecture


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1.2.1GSM Network Architecture with out GPRS

HLR GCRAuC

E

B C

D

F

G H

I

Abis

BCDEFGHI

PSTNISDN

BTS - BSC

MSC-VLR(SM-G)MSC-HLR

HLR-VLR(SM-G)MSC-MSC (SS7 basic) +

MAP MSC-EIRVLR-VLR

HLR-AuCMSC-GCR

MSC-PSTN (SS7 basic) + TUP or ISUP MSC-ISDN

LapD(ISDN type)

GSM Circuit-switching:

(BSSAP = BSSMAP + DTAP)

A BSC - MSC (SS7 basic) + BSSAP

BTSLapDm

(GSM specific)Um MS - BTS

BSCBSC

MSCMSC

BTS

PSTN /ISDN

MS

VLR VLR EIR

AuC

AuC Authentication Center

BTS Base Transceiver Station

BSC Base Station Controller

BSS Base Station System

EIR Equipment Identity Register

HLR Home Location Register

ISDN Integrated Services Digital Network

MS Mobile Station

OMC-R Operation and Maintenance Centre – Radio

PSTN Public Switched Telephone Network

VLR Visitor Location Register

GCR Group Call Register -The general architecture of GSM is maintained. In addition, a network function is required which is used for registration of the broadcast call attributes, the Group Call Register.


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Gc GGSN-HLR IP/SS7

LAPDm(GSM specific)

Gs

Gb

Um (Radio)

Gi GGSN-Data Network IP

MS

BSS - SGSN

Gr SS7SGSN-HLR

Gf SS7SGSN-EIRSGSN-MSC/VLR

GnSGSN-GGSN IP

IPSGSN-SGSN

MS - BTS

Gs

GfGr

Gn

Gn

Gc SS7

GSM Packet-switching (GPRS/EDGE):

BSSGP

BSSwithPCU

BSSwithPCU

HLR EIR

DataNetwork

SGSN

GGSN

SGSN MSC


1.2.2 GSM Network Architecture with GPRS

Note: according to GSM 03.60, the PCU function (Packet Control Unit) may be implemented on the BTS, the BSC or the SGSN site.

MFS Multi – BSS Fast Packet Server A935

PSTN Public Switched Telephone Network

SGSN Serving GPRS Support Node

GGSN Gateway GPRS Support Node

VLR Visitor Location Register


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1.2.3 OMC-R

BSS

BTS

BTS

Alcatel9135 MFS SSP

+ RCPBSC

SGSN

OMC-R

MS

A bis A ter

TC

Gb

A

GGSNGn

OMC-G

NSS

GPRS CN

GPRS Core Network (CN): Alcatel 1000 GPRS

Packet Control Unit (PCU) function for several BSS: Alcatel 9135 MFS

TC Transcoder


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1.2.4 GSM Network Elements

Base Station System BSS Base Transceiver Station BTS Base Station Controller BSC

Terminal Equipment Mobile Station MS

Operation and Maintenance Center-Radio OMC-R

Network Subsystem NSS Mobile Services Switching Center

MSC Visitor Location Register VLR Home Location Register HLR Authentication Center AuC Equipment Identity Register EIR

Operation and Maintenance Center OMC

Multi-BSS Fast Packet Server (GPRS) MFS

Serving GPRS Support Node SGSN Gateway GPRS Support Node

GGSN


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1.2.5 RF Spectrum

System Total Bandwidth Uplink frequency band /MHz

Downlink frequency band /MHz

Carrier Spacing

GSM 450 2x7.5MHz 450.4-457.6 460.4-467.6 200 kHz

GSM 480 2x7.2MHz 478.8-486 488.8-496 200 kHz

GSM 850 2x25MHz 824-849 869-894 200 kHz

GSM 900 2x25MHz 890-915 935-960 200 kHz

E-GSM 2x35MHz 880-915 925-960 200 kHz

DCS 1800 (GSM)

2x75MHz 1710-1785 1805-1880 200 kHz

PCS 1900 (GSM)

2x60MHz 1850-1910 1930-1990 200 kHz

AMPS : UK

TACS : UK

DECT: Cordless

CDMA: System of next Generation

TETRA: Digital communication System for Commercial use

Frequency Ranges depends on country.


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1 Intruduction

1.3 Mobile Phone Systems


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FDMA (Frequency Division Multiple Access)

TDMA (Time Division Multiple Access)

CDMA (Code Division Multiple Access)

1.3 Mobile Phone Systems Access Methods

1.3.1 Access Methods


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All rights reserved © 2005, Alcatel@@PRODUCT - @@COURSENAME

@@SECTION - @@MODULE - 25


1.3.2 FDMA

Used for standard analog cellular mobile systems(AMPS, TACS, NMT etc.)

Each user is assigned a discrete slice of the RF spectrum Permits only one user per channel since it allows the user to use the

channel 100% of the time.


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1.3.3 TDMA

Multiple users share RF carrier on a time slot basis Carriers are sub-divided into timeslots Information flow is not continuous for an user, it is sent and received in

"bursts"


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1.3.4 CDMA (Code Division Multiple Access)

Multiple access spread spectrum technique Each user is assigned a sequence code during a call No time division; all users use the entire carrier

What is CDMA ?

One of the most important concepts to any cellular telephone system is that of "multiple access", meaning that multiple,

simultaneous users can be supported. In other words, a large number of users share a common pool of radio channels and

any user can gain access to any channel (each user is not always assigned to the same channel). A channel can be thought

of as merely a portion of the limited radio resource which is temporary allocated for a specific purpose, such as

someone's phone call. A multiple access method is a definition of how the radio spectrum is divided into channels and

how channels are allocated to the many users of the system.


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1.3.5 Analogue Cellular Mobile Systems

Analogue transmission of speech One TCH/Channel Only FDMA (Frequency Division Multiple Access) Different Systems

AMPS (Countries: USA) TACS (UK, I, A, E, ...) NMT (SF, S, DK, N, ...) ...

NMT: Nordic Mobile Telephone System. Allianz von Nordischen Systembetreibern.

AMPS: Advanced Mobile Phone System

TACS: Total Access Communications System

UK United Kingdom

I Italy

A Austria

E Spain

SF Finnland

S Schweden

DK Denmark

N Norwegen


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1.3.6 AMPS (Advanced Mobile Phone System)

Analogue cellular mobile telephone system Predominant cellular system operating in the US Original system: 666 channels (624 voice and 42 control channels) EAMPS - Extended AMPS

Current system: 832 channels (790 voice, 42 control); has replaced AMPS as the US standard

NAMPS - Narrowband AMPS New system that has three times more voice channels than EAMPS with no loss of signal quality

Backward compatible: if the infrastructure is designed properly, older phones work on the newer systems


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1.3.7 AMPS - Technical objectives

Technology FDMARF frequency band 825 - 890 MHzChannel Spacing 30 kHzCarriers 666 (832)Timeslots 1Mobile Power 0.6 - 4 WTransmission Voice, (data)HO possibleRoaming possible


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1.3.8 AMPS Frequency Range

991 1023 1 666 667 799

Extended AMPS

AMPSUplink

Channel number

Frequency of Channel(MHz)

824.040 825.030 844.980

845.010

845.010

Duplex distance45 MHz

Downlink

Channel number

Frequency of Channel(MHz)

991 1023 1 666 667 799

Extended AMPS

AMPS

869.040 870.030 889.980 893.980

890.010


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1.3.9 TACS Total Access Communications System

Analogue cellular mobile telephone system The UK TACS system was based on the US AMPS system TACS - Original UK system that has either 600 or 1000 channels (558 or

958 voice channels, 42 control channels) RF frequency band: 890 - 960

Uplink: 890-915 Downlink: 935-960 Channel spacing: 25 KHz


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1.3.10 TACS - Technical objectives

Technology FDMARF frequency band 890 - 960 MHzChannel Spacing 25 kHzCarriers 1000Timeslots 1Mobile Power 0.6 - 10 WTransmission Voice , (data)HO possibleRoaming possible

Tacs disturb GSM because the same frequency- range!


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1.3.11 Different TACS-Systems

ETACS - Extended TACS Current UK system that has 1320 channels (1278 voice, 42 control)

and has replaced TACS as the UK standard

ITACS and IETACS - International (E)TACS Minor variation of TACS to allow operation outside of the UK by allowing flexibility in

assigning the control channels

JTACS - Japanese TACS A version of TACS designed for operation in Japan

NTACS - Narrowband TACS New system that has three times as many voice channels as ETACS with no loss of

signal quality


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1.3.12 TACS (Total Access Communications System)

1329 2047 0 23 44 323

344

600

100011

890.0125(935.0125

)

905(950

)

915(960

)

1st Assignment in the UK (600 channels)

Organisation B

Organisation A

Original concept (1000 channels)

890935

889.9875(934.9875

)

889.9625(934.9625

)

872.0125(917.0125

)

872917

Frequency of channel

[Mhz]

Number of Channel

E-TACS - 1320 Channels

Borders of channels

[Mhz]

Mobile Station TX

(Base Station TX)


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1.3.13 Why digital mobile communication ?

Easy adaptation to digital networks

Digital signaling serves for flexible adaptation to operational needs

Possibility to realize a wide spectrum of non-voice services

Digital transmission allows for high cellular implementation flexibility

Digital signal processing gain results in high interference immunity

Privacy of radio transmission ensured by digital voice coding and encryption

Cost and performance trends of modern microelectronics arein favour of a digital solution


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1.3.14 GSM - Technical objectives

Technology TDMA/FDMARF frequency band 890 - 960 MHzChannel Spacing 200 kHzCarriers 124Timeslots 8Mobile Power (average/max) 2 W/ 8 WBTS Power class 10 ... 40 WMS sensitivity - 102 dBmBTS sensitivity - 104 dBmTransmission Voice, dataHO possibleRoaming possible


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1.3.15 DECT (Digital European Cordless Telephone)

European Standard for Cordless Communication Using TDMA-System Traditional Applications Domestic use ("Cordless telephone") Cordless office applications

Combination possible with ISDN GSM

High flexibility for different applications


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1.3.16 DECT - Technical objectives

Technology TDMA/FDMARF frequency band 1880 - 1900 MHzChannel Spacing 1.728 MHzCarriers 10Timeslots 12 (duplex)Mobile Power (average/max) 10 mW/250 mWBTS Power class 250 mWMS sensitivity -83 dBmBTS sensitivity -83 dBmTransmission Voice, dataHO possible

Frequency Range with 10 carriers, 1728 KHz channel spacing

10 carrier 24 timeslots

120 Duplex channels

cell radius 200-300 meter

no Equalizer

HO und Macro Diversity Optional


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1.3.17 CDMA - Technical objectives

Spread spectrum technology(Code Division Multiple Access)

Several users occupy continuously one CDMA channel(bandwidth: 1.25 MHz) The CDMA channel can be re-used in every cell

Each user is addressed by A specific code and Selected by correlation processing

Orthogonal codes provides optimumisolation between users


Vocoder:

8Kbps oder 13 Kbps.

Multiple Forms of diversity:

Frequency diversity (Spektrum 1.25 MHz)

Spatial diversity (2 different receiving Antennas)

Path diversity (Usage of Multi-path propagation)

Time diversity (Interleaving, error correction codes….)

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1.3.18 CDMA - Special Features

Vocoder allows variable data rates Soft handover Open and closed loop power control Multiple forms of diversity Data, fax and short message services possible


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1.3.19 CDMA - Technical objectives

Technology CDMARF frequency band 869-894 / 824-849

or 1900 MHzChannel Spacing 1250 kHzChannels per 1250 kHz 64Mobile Power (average/max) 1-6.3 W / 6.3 WTransmission Voice, dataHO ("Soft handoff") possibleRoaming possible


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1.3.20 TETRA - Features

Standard for a frequency efficient european digital trunked radio communication system (defined in 1990)

Possibility of connections with simultaneous transmission of voice and data

Encryption at two levels: Basic level which uses the air interface encryption End-to-end encryption (specifically intended for public safety users)

Open channel operation "Direct Mode" possible Communication between two MS without connecting via a BTS

MS can be used as a repeater


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1.3.21 TETRA - Typical Users

Public safety

Police (State, Custom, Military, Traffic)

Fire brigades

Ambulance service

...

Railway, transport and distribution companies

For use in:

Police, ambulance and fire Services Security Services Military Transport Services Closed User Groups (CUGs) Factory site services


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1.3.22 TETRA - Technical objectives

Technology TDMA/FDMARF frequency band 380 - 400 MHzChannel Spacing 25 or 12.5 KHzCarriers not yet specifiedTimeslots 4Mobile Power (3 Classes) 1, 3, 10 WBTS Power class 0.6 - 25 WMS sensitivity -103 dBmBTS sensitivity -106 dBmTransmission Voice, data, images,

short messageHO possibleRoaming possible


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1.3.23 Universal Mobile Telecommunication System

Third generation mobile communication system

Combining existing mobile services (GSM, CDMA etc.) and fixed telecommunications services

More capacity and bandwidth

More services (Speech, Video, Audio, Multimedia etc.)

Worldwide roaming

"High" subscriber capacity

http://www.vtt.fi/tte/nh/UMTS/


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1 Intruduction

1.4 RNP Process Overview


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1.4.1 Definition of RN Requirements

The Request for Quotation (RfQ) from the customer prescribes the requirements mainly

Coverage Definition of coverage probability

• Percentage of measurements above level threshold

Definition of covered area

Traffic Definition of Erlang per square kilometer Definition of number of TRX in a cell Mixture of circuit switched and packed switched traffic

QoS Call success rate RxQual, voice quality, throughput rates, ping time


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1.4.2 Preliminary Network Design

The preliminary design lays the foundation to create the Bill of Quantity (BoQ) List of needed network elements

Geo data procurement Digital Elevation Model

DEM/Topographic map Clutter map

Definition of standard equipment configurations dependent on clutter type traffic density

Coverage Plots Expected receiving level

Definition of roll out phases Areas to be covered Number of sites to be installed Date, when the roll out takes place.

Network architecture design Planning of BSC and MSC locations

and their links

Frequency spectrum from license conditions


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1.4.3 Project Setup and Management

This phase includes all tasks to be performed before the on site part of the RNP process takes place.

This ramp up phase includes: Geo data procurement if required Setting up ‘general rules’ of the project Define and agree on reporting scheme to be used

• Coordination of information exchange between the different teams which are involved in the project

Each department/team has to prepare its part of the project Definition of required manpower and budget Selection of project database (MatrixX)


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1.4.4 Initial Radio Network Design

Area surveys As well check of correctness of geo data

Frequency spectrum partitioning design RNP tool calibration

For the different morpho classes:• Performing of drive measurements• Calibration of correction factor and standard deviation by comparison of

measurements to predicted received power values of the tool

Definition of search areas (SAM – Search Area Map) A team searches for site locations in the defined areas The search team should be able to speak the national language

Selection of number of sectors/TRX per site together with project management and customer

Get ‘real’ design acceptance from customer based on coverage prediction and predefined design level thresholds


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1.4.5 Site Acquisition Procedure

Delivery of site candidates Several site candidates shall be the result

out of the site location search

Find alternative sites If no site candidate or no satisfactory

candidate can be found in the search area Definition of new SAM (Search Area Map) Possibly adaptation of radio network design

Check and correct SAR (Site Acquisition Report) Location information Land usage Object (roof top, pylon, grassland)

information Site plan

Site candidate acceptance and ranking If the reported site is accepted as

candidate, then it is ranked according to its quality in terms of

• Radio transmission-High visibility on covered area-No obstacles in the near field of the antennas-No interference from other systems/antennas

• Installation costs-Installation possibilities-Power supply-Wind and heat

• Maintenance costs-Accessibility-Rental rates for object-Durability of object


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1.4.6 Technical Site Survey

Agree on an equipment installation solution satisfying the needs of RNE Radio Network Engineer Transmission planner Site engineer Site owner

The Technical Site Survey Report (TSSR) defines Antenna type, position,

bearing/orientation and tilt Mast/pole or wall mounting

position of antennas EMC rules are taken into account

• Radio network engineer and transmission planner check electro magnetic compatibility (EMC) with other installed devices

BTS/Node B location Power and feeder cable mount Transmission equipment installation Final Line Of Site (LOS)

confirmation for microwave link planning

• E.g. red balloon of around half a meter diameter marks target location

If the site is not acceptable or the owner disagrees with all suggested solutions The site will be rejected Site acquisition team has to

organize a new date with the next site from the ranking list


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1.4.7 Basic Parameter Definition

After installation of equipment the basic parameter settings are used for

Commissioning• Functional test of BTS and VSWR check

Call tests

RNEs define cell design data Operations field service generates the basic software using the cell design CAE data

Cell design CAE data to be defined for all cells are for example:

CI/LAC/BSIC Frequencies Neighborhood/cell handover

relationship Transmit power Cell type (macro, micro, umbrella, …)


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1.4.8 Cell Design CAE Data Exchange over COF

A9156 RNO

OMC 1

COF

ACIE

ACIE

POLOBSS Software offline production

3rd Party RNP or Database

A955 V5 /A9155 V6

RNP

A9155PRC Generator

Module

ConversionOMC 2

ACIE = PRC file

ACIE ASCII Configuration Import Export PRC Provisioning Radio Configuration

SC Supervised Configuration

COF CMA Offsite

CMA Customer Management Application

CAE Customer Application Engineering


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1.4.9 Turn On Cycle

The network is launched step by step during the TOC A single step takes typically two or three weeks

Not to mix up with rollout phases, which take months or even years

For each step the RNE has to define ‘TOC Parameter’ Cells to go on air Determination of frequency plan Cell design CAE parameter

Each step is finished with the ‘Turn On Cycle Activation’ Upload PRC/ACIE files into OMC-R Unlock sites


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1.4.10 Site Verification and Drive Test

RNE performs drive measurement to compare the real coverage with the predicted coverage of the cells.

If coverage holes or areas of high interference are detected Adjust the antenna tilt and orientation

Verification of cell design CAE data To fulfill heavy acceptance test requirements, it is absolutely essential to

perform such a drive measurement. Basic site and area optimization reduces the probability to have

unforeseen mysterious network behavior afterwards.


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1.4.11 HW / SW Problem Detection

Problems can be detected due to drive tests or equipment monitoring Defective equipment

• will trigger replacement by operation field service

Software bugs Incorrect parameter settings

• are corrected by using the OMC or in the next TOC

Faulty antenna installation• Wrong coverage footprints of the site will trigger antenna re-alignments

If the problem is serious Lock BTS Detailed error detection Get rid of the fault Eventually adjusting antenna tilt and orientation


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1.4.12 Basic Network Optimization

Network wide drive measurements It is highly recommended to perform network wide drive tests before doing

the commercial opening of the network Key performance indicators (KPI) are determined The results out of the drive tests are used for basic optimization of the

network Basic optimization

All optimization tasks are still site related Alignment of antenna system Adding new sites in case of too large coverage holes Parameter optimization

• No traffic yet -> not all parameters can be optimized

Basic optimization during commercial service If only a small number of new sites are going on air the basic optimization

will be included in the site verification procedure


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1.4.13 Network Acceptance

Acceptance drive test Calculation of KPI according to acceptance requirements in contract Presentation of KPI to the customer Comparison of key performance indicators with the acceptance targets in

the contract The customer accepts

the whole network only parts of it step by step

Now the network is ready for commercial launch


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1.4.14 Further Optimization

Network is in commercial operation Network optimization can be performed Significant traffic allows to use OMC based statistics by using A9156

RNO and A9185 NPA End of optimization depends on contract and mutual agreement between

Alcatel and customer Usually, Alcatel is only involved during the first optimization activities directly

after opening the network commercially


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2 Coverage Planning


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2 Coverage Planning

2.1 Geo databases


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2.1.1 Why are geographical data needed for Radio Network Planning ?

Propagation models dependon geographical data

Geographical information for site acquisition Latitude (East/West) / Longitude (North/South) Rectangular coordinates

(e.g. UTM coordinates)


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2.1 Geo databases

2.1.2 Maps are flat

Longitude

Latitude

x, y

Problem: Earth is 3D, the maps are 2D


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2.1 Geo databases

2.1.3 Mapping the earth

The Earth is a very complex shape To map the geography of the earth,

a reference model (-> Geodetic Datum) is needed The model needs to be simple so that it is easy to use It needs to include a Coordinate system which allows the

positions of objects to be uniquely identified It needs to be readily associated with the physical world so that

its use is intuitive


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2.1 Geo databases

2.1.4 Map Projection

Geodetic Datume.g. WGS84, ED50

Ellipsoide.g. WGS84,

International 1924

GeocoordinateSystem

e.g. UTM

Map Projectione.g. Transverse Mercator (UTM),

Lambert Conformal Conic


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2.1 Geo databases

2.1.5 Geodetic Ellipsoid

Definition: A mathematical surface (an ellipse rotated around the earth's polar axis) which provides a convenient model of the size and shape of the earth. The ellipsoid is chosen to best meet the needs of a particular map datum system design.

Reference ellipsoids are usually defined by semi-major (equatorial radius) and flattening (the relationship between equatorial and polar radii).


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2.1 Geo databases

2.1.6 Global & Regional Ellipsoids

Global ellipsoidse.g. WGS84, GRS80 Center of ellipsoid is

“Center of gravity” Worldwide consistence of

all maps around the world

Regional ellipsoidse.g. Bessel, Clarke, Hayford, Krassovsky Best fitting ellipsoid for a part of the world

(“local optimized”) Less local deviation


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2.1 Geo databases

2.1.7 Geodetic Datum

A Geodetic Datum is a Reference System which includes:

A local or global Ellipsoid One “Fixpoint”

Attention: Referencing geodetic coordinates to the wrong map datum can result in positionerrors ofhundreds of meters

Info:In most cases the shift, rotation and scale factor of a Map Datum is relative to the “satellite map datum” WGS84.


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2.1 Geo databases

2.1.8 Different Map Projection’s

Cylindrical e.g. UTM,

Gauss-Krueger

Conical e.g.Lambert Conformal

Conic

Planar/Azimuthal

Info: In 90% of the cases we will have a cylindrical projection in 10% of the cases a conical projection


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2.1 Geo databases

2.1.9 Geo-Coordinate System

To simplify the use of maps aCartesian Coordinates is used

To avoid negative values a False Easting value and a False Northing value

is added

Also a scaling factor is used to minimize the “projection error”over the whole area

X = EastingY = Northing


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2.1 Geo databases

2.1.10 WGS 84 (World Geodetic System 1984)

Most needed Geodetic Datumin the world today (“Satellite Datum”)

It is the reference frame usedby the U.S. Department of Defenseis defined by the National Imageryand Mapping Agency (NIMA)

The Global Positioning System (GPS)system is based on the World GeodeticSystem 1984 (WGS-84).

Optimal adaption to the surface of the earth


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2.1 Geo databases

2.1.11 Transverse Mercator Projection

Projection cylinder is rotated 90 degrees from the polar axis (“transverse”)

Geometric basisfor the UTMand theGauss-KruegerMap Projection

ConformalMap projection


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2.1 Geo databases 2.1.12 Transverse Mercator Projection (e.g. UTM )

Middle-Meridian


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2.1 Geo databases

2.1.13 Universal Transverse Mercator System

60 zones, each 6o (60 · 6o = 360o )±3o around each center meridian

Beginning at 180o longitude(measured eastward fromGreenwich)

Zone number = (center meridian + 183o ) / 6o


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2.1 Geo databases

2.1.14 UTM - Definitions

False Easting: 500 000 m(Middle-meridian x = 500 000 m)

False Northing:Northern Hemisphere: 0 m Southern Hemisphere: 10 000 000 m

Scaling Factor: 0,9996(used to minimize the“projection error” over the whole area)


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2.1 Geo databases

2.1.15 UTM Zones (e.g. Europe)

UTM-Zones

9° 15° 21° 27° 33° 39°3°-3°-6° Middle-Meridian


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UTM-System

False origin on the central meridian of the zone has an easting of 500,000 meters.

All eastings have a positive values for the zone

Eastings range from 100,000 to 900,000 meters

The 6 Degree zone ranges from 166,667 to 833,333 m, leaving about a 0.5° overlap at each end of the zone(valid only at the equator)

This allows for overlaps and matching between zones

2.1 Geo databases

2.1.16 UTM-System


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2.1 Geo databases

2.1.17 UTM Zone Numbers


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UTM-Zone: 32

Middle meridian: 9o

(9o = 500 000 m“False Easting”)

2.1 Geo databases

2.1.18 UTM-System: Example "Stuttgart"

Transformation: latitude / longitude → UTM system

North 48o 45' 13.5''

East 9o 11' 7.5''

y = 5 400 099 m

x = 513 629 m


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2.1 Geo databases

2.1.19 Lambert Conformal Conic Projection

Maps an ellipsoid onto a cone whose central axis coincides with the polar axis

Cone touches the ellipsoid=> One standard parallel (1SP)(e.g. NTF-System in France)

Cutting edges of cone and ellipsoid=> Two standard parallels (2SP)(e.g. Lambert-Projection in Austria)


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2.1 Geo databases

2.1.20 Geospatial data for Network Planning

DEM (Digital Elevation Model)/ Topography Morphostructure / Land usage / Clutter Satellite Photos /

Orthoimages Scanned Maps Background data

(streets, borders,coastlines, etc. )

Buildings Traffic data


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2.1 Geo databases

2.1.21Creation of geospatial databases

Satellite imagery Digitizing maps Aerial photography

Geospatial data


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2.1 Geo databases

2.1.22 Parameters of a Map

Coordinate system Map Projection

(incl. Geodetic Datum) Location of the map (Area …) Scale:

macrocell planning1:50000 - 1:100000

microcell planning1:500 -1:5000

Thematic Source Date of Production


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Raster data DEM /Topography Morphostructure /

Land usage / Clutter Traffic density

Vector data Background data

(streets, borders, coastlines, etc. ) Buildings

2.1 Geo databases

2.1.23 Raster- and Vectordata

x

y

(x1,y1)

(xn,yn)


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2.1 Geo databases

2.1.24 Rasterdata / Grid data

Pixel-oriented data Stored as row and column Each Pixel stored in one or two

byte Each Pixel contents information

(e.g. morphoclass,colour of a scanned map, elevation of a DEM)


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2.1 Geo databases

2.1.25 Vectordata

Vector mainly used are: airport, coastline, highway, main roads, secondary roads, railway, rivers/lakes

Each vector contents Info about kind of vector

(e.g. street, coastline) A series of several points

Each point has a corresponded x / y -value(e.g. in UTM System or as Long/Lat)

Info about Map projection and used Geodetic Datum

(x1,y1)

(xn,yn)


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2.1 Geo databases

2.1.26 Digital Elevation Model (DEM)

Raster dataset that showsterrain features such as hillsand valleys

Each element (or pixel) inthe DEM image represents the terrain elevation at that location

Resolution in most cases: 20 m for urban areas50-100 m for other areas

DEM are typically generatedfrom topographic maps,stereo satellite images,or stereo aerial photographs


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2.1 Geo databases 2.1.27 Morphostructure / Land usage / Clutter (1)

Land usage classificationaccording to the impact on wave propagation

In most cases:7...14 morpho classes

Resolution in most cases:20 m for cities50…100m other areasfor radio networkplanning

The clutter files describe the land cover (dense urban, buildings, residential, forest, open, villages....). Ground is

represented by a grid map where each bin is characterised by a code corresponding to a main type of cover (a clutter

class). The clutter maps are 8 bits/pixel (256 classes)-raster maps, they show an image with a colour assigned to each

clutter class (by default, grey shading).

Clutter file provides clutter code per bin. Bin size is defined by pixel size (P stated in metre). Pixel size must be the same

in both directions. Abscissa and ordinate axes are respectively oriented in right and down directions. First point given in

the file corresponds to the upper-left corner of the image. This point refers to the northwest point geo-referenced by A9155


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2.1 Geo databases

2.1.28 Morphostructure (2)

Besides the topo database the basic input for radio network planning

Each propagation area has different obstacles like buildings, forest etc.Obstacles which have similar effects on propagation conditions are classified in morphoclassesEach morphoclass has a corresponding value for the correction gain

The resolution of the morphodatabases should be adaptedto the propagation model

Morpho correction factor for predictions:

0 dB (”skyscapers") … 30 dB (”water")

Morphodatabases (Landuse/Clutter) are a special kind of geodatabases. The morphodatabase is beside the topodatabase the basic input for radio network planning. Each morphoclass has a corresponding value of propagation loss. Together with a topographical database it is possible to predict the radio wave propagation.

Each propagation area has different obstacles like buildings, forest etc. Those obstacles, which have similar effects on propagation conditions are classified in morphoclasses.

This resolution of the morphodatabases should be adapted to the empirical propagation model for macrocellular radio network planning and the necessary planning resolution. In most cases the resolution of the rasterdatabasesfor morphostructure is around 50 ...100 m. With those values an optimum between calculation time and the necessary resolution of the prediction is reached in most radio network planning projects.

For microcellular radio network planning a buildingdatabase is needed with a higher resolution.

Each morphoclass is corresponding with a morpho-correction factor. The propagation loss is between 30 dB ("skyscrapers") ... and around 0 dB ("open area") The morphocorrection factors are achieved by calibration measurements


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2.1 Geo databases

2.1.29 Morphoclasses

Code Morpho-

structure Description

0 not classified e.g. edge of a database

1 skyscrapers / buildings

very high buildings ( >40m), very high density of buildings, no vegetation on ground level e.g. cities like NewYork, Tokio etc.

2 dense urban 4 or more storeys, areas within urban perimeters, inner city, very little vegetation, high density of buildings, most buildings are standing close together, small pedestrian zones and streets incl.

3 medium urban / mean

urban

3 or 4 storeys, areas within urban perimeters, most buildings are standing close together, less vegetation, middle density of buildings, small pedestrian zones and streets included

4 lower urban / suburban

2 or 3 storeys, middle density of buildings, some vegetation, terraced houses with gardens

5 residential 1-2 storeys, low density of buildings with gardens e.g. farmhouses, detached houses

6 industrial zone / industrial

factory, warehouse, garage, shipyards


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2.1 Geo databases

2.1.30 Morphoclasses (2)

Code Morpho-

structure Description

7 forest all kinds of forest, parks, with high tree density

8 agriculture / rural

high vegetation, plants: 1... 3 m, high density of plants, e.g. crop fields, fruit plantation

9 low tree density / parks

low vegetation, low height of plants, low density of plants, some kinds of parks, botanical garden

10 water sea, rivers, all kind of fresh- and saltwater

11 open area no buildings, no vegetation e.g. desert, beach, part of an airport, big streets etc. huge parking areas, large

12 (optional)

defined by networkplanner if necessary

13 (optional)

defined by networkplanner if necessary


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2.1 Geo databases

2.1.31Background data (streets, borders etc.)

All kinds of information data like streets, borders, coastlines etc.

Necessary for orientationin plots of calculation results

The background data arenot needed for the calculationof the fieldstrength, power etc.

These data represent either polygons (regions...), or lines (roads, coastlines...) or points (towns...).


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2.1 Geo databases

2.1.32 Orthophoto

Georeferenced Satellite Image Resolution:

most 10 or 20 m Satellite: e.g. SPOT, Landsat

These geographic data regroup the road maps and the satellite images ; they are only used for display and provide information about the geographic environment. A9155 supports scanned image files with TIFF (1, 4, 8, 24-bits/pixel), BIL (1, 4, 8, 24-bits/pixel), PlaNET© (1, 4, 8, 24-bits/pixel), BMP (1-24-bits/pixel) and ErdasImagine (1, 4, 8, 24-bits/pixel) formats.


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2.1 Geo databases

2.1.33 Scanned Maps

Mainly used asbackground data

Not used for calculationbut for localisation

Has to be geocodedto put it into a GIS (Geographic Information System) e.g. a Radio Network Planning Tool


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2.1 Geo databases

2.1.34 Buildings

Vectordata Outlines of

• single buildings• building blocks

Building heights Material code

• not: roof shape


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2.1 Geo databases

2.1.35 Buildings (2)

Microcell radio network planningis mainly used in urban environment

The prediction of mircowavepropagation is calculated witha ray-tracing/launching model

A lot of calculationsteps are needed

Optimum building databaserequired (data reduction) tominimize the pre-calculation time


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2.1 Geo databases

2.1.36 Traffic density

Advantageous in theinterference calculation,thus for frequencyassignment andin the calculationof average figures innetwork analysis

Raster database of traffic densityvalues (in Erlangs) of thewhole planning area

Resolution: 20...100 m


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2.1 Geo databases

2.1.37 Converting one single point (1a)

Example “Stuttgart” (Example 1)Long/Lat (WGS84) => UTM (WGS84)

Input:Longitude: 9 deg 11 min 7.5 secLatitude: 48 deg 45 min 13.5 secDatum “WGE: World Geodetic System 1984”; Projection: “Geodetic”

Exercise: Convert following example with the program “Geotrans”:

Output: Easting: 513629 mNorthing: 5400099 mDatum “WGE: World Geodetic System 1984”Projection: “Universersal Transverse Mercator (UTM)”Zone: 32 ; Hemisphere: N (North)

Preset of thisvalues necessary

Values, which willcalculated by program


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2.1 Geo databases

2.1.38 Converting one single point (1b)

GEOTRANS(Geographic Translator)is an application program which allows you to convert geographic coordinates easily among a wide variety of coordinate systems, map projections, and datums.

Example “Stuttgart” (Example 1)Long/Lat (WGS84) => UTM (WGS84)

Source: http://164.214.2.59/GandG/geotrans/geotrans.html


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2.1 Geo databases

2.1.39 Converting one single point (2a)

Input:Longitude: 9 deg 11 min 7.5 secLatitude: 48 deg 45 min 13.5 secDatum “WGE: World Geodetic System 1984”; Projection: “Geodetic”

Exercise: Convert following example with the program “Geotrans”:

Output: Easting: 513549 mNorthing: 5403685 mDatum “EUR-A: EUROPEAN 1950, Western Europe”Projection: “Universersal Transverse Mercator (UTM)”Zone: 32 ; Hemisphere: N (North)

Example “Stuttgart” (Example 2)Long/Lat (WGS84) => UTM (ED50) (ED50 = EUR-A = European Datum 1950)


Values, which willcalculated by program


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2.1 Geo databases

2.1.40 Converting one single point (2b)

Example “Stuttgart” (Example 2)Long/Lat (WGS84) => UTM (ED50)(ED50 = EUR-A = European Datum 1950)

Attention: For flat coordinates (e.g. UTM) as well as for geographic coordinates (Long/Lat) a reference called “Geodetic Datum” is necessary.

Diff. X (Ex.2 - Ex.1): 69 mDiff. Y (Ex.2 - Ex.1): 200 mDifference because of different Geodetic Datums


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2.1 Geo databases

2.1.41 Converting a list of points (3a)

Example “Stuttgart” (Example 3 )Long/Lat (WGS84) => UTM (WGS84)

Input:text-file with the values (list) of the longitudeand latitude of different points(How to create the inputfile see on page 3c)

Output:Datum: “WGE: World Geodetic System 1984”Projection: “Universal Transverse Mercator (UTM)”Zone: 32



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2.1 Geo databases

2.1.42 Converting a list of points (3b)

Example “Stuttgart” (Example 3 )Long/Lat (WGS84)

=> UTM (WGS84)


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2.1 Geo databases

2.1.43 Converting a list of points (3c)

Example “Stuttgart” (Example 3)Long/Lat (WGS84)=> UTM (WGS84)

Latitude Longitude UTM-ZoneHemisphere

Easting (x)Northing (y)

Optional: different error-infos,depending on the input-datadefault: “Unk”=“unknown”

Geotrans V2.2.3 Geotrans V2.2.3

deg min sec deg min sec


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2.1 Geo databases

2.1.44 Provider for Geospatial data

Geodatasupplier InternetBKS www.bks.co.ukComputaMaps www.computamaps.comGeoimage www.geoimage.frInfoterra www.infoterra-global.comIstar www.istar.frRMSI www.rmsi.com


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2.1 Geo databases

2.1.45 Links for more detailed infos

Maps Projection Overviewhttp://www.colorado.edu/geography/gcraft/notes/mapproj/mapproj.htmlhttp://www.ecu.edu/geog/faculty/mulcahy/mp/http://www.wikipedia.org/wiki/Map_projection

Coordinate Transformation (online)http://jeeep.com/details/coord/http://www.cellspark.com/UTM.html

Map Collectionhttp://www.lib.utexas.edu/maps/index.html

Finding out Latitude/Longitude of cities etc. http://www.maporama.com


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2 Coverage Planning

2.2 Antennas and Cables


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2.2.1 The Antenna System

Antennas Power divider Cables (jumper) Feeder cables Connectors Clamps Lightning protection Wall glands Planning

Rxdiv

Tx

Rx

Feedercable

Earthingkit

Wallgland

Jumper cables

Feederinstallationclamps

Plugs7/16“

Sockets7/16“

Mountingclamp

Grounding

Lightningrod Antennas

Earthing kit

Jumpercable Jumper

cable

Mechanicalantennasupportstructure


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2.2.2 Antenna Theory

50Ω is the impedance of the cable 377Ω is the impedance of the air Antennas adapt the different impedances They convert guided waves, into free-space waves (Hertzian waves)

and/or vice versa

Z =377ΩZ =50Ω


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2.2.3 Antenna Data

Polarization Specification due to certain wave polarization (linear/elliptic, cross-

polarization)

Half power beam width (HPBW) Related to polarization of electrical field Vertical and Horizontal HPBW

Antenna pattern Yields the spatial radiation characteristics of the antenna

Front-to-back ratio Important for interference considerations


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2.2.4 Antenna Pattern and HPBW

0 dB

-3 dB

-10 dB

0 dB

-3 dB

-10 dB

verticalhorizontal

sidelobe

null direction

main beam

HPB

W


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2.2.5 EIRP

Pt = 45 dBm

Gain =11dBi

Isotropic radiated Power Pt

Effective isotropicradiated power:EIRP = Pt+Gain

= 56 dBm

V1

V2 = V1

radiatedpower


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For the link between base station and mobile station, mostly linear antennas are used:

Monopole antennas• MS antennas, car roof antennas

Dipole antennas• Used for array antennas at base stations for increasing the directivity of RX and TX

antennas


2.2.6 Linear Antennas


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2.2.7 Monopole Antenna Pattern

Influence of antenna length on the antenna pattern


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2.2.8 Panel Antenna with Dipole Array

Many dipoles are arranged in a grid layout Nearly arbitrary antenna patterns may be designed

Feeding of the dipoles with weighted and phase-shifted signals Coupling of all dipole elements


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2.2.9 Dipole Arrangement

Dipole arrangement

Typical flat panel antenna

Dipole element

Weightedandphaseshiftedsignals


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2.2.10 Omni Antenna

Antenna with vertical HPBW for omni sites Large area coverage

Advantages Continuous coverage around the site Simple antenna mounting Ideal for homogeneous terrain

Drawbacks No mechanical tilt possible Clearance of antenna required


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2 Coverage Planning

2.3 Antenna Parameters


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2.3 Antennas Parameters

2.3.1 X 65° T6 900MHz 2.5m

Rural road coverage with mechanical uptilt

Antenna RFS Panel Dual Polarized Antenna

872-960 MHz APX906516-T6 Series

Electrical specification Gain in dBi: 17.1 Polarization: +/-45° HBW: 65° VBW: 6.5° Electrical downtilt: 6°

Mechanical specification Dimensions HxWxD in mm: 2475 x

306 x 120 Weight in kg: 16.6

Horizontal Pattern


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2.3.2 X 65° T6 900MHz 1.9m

Dense urban area Antenna

RFS Panel Dual Polarized Antenna 872-960 MHz

APX906515-T6 Series

Electrical specification Gain in dBi: 16.5 Polarization: +/-45° HBW: 65° VBW: 9° Electrical downtilt: 6°


306 x 120 Weight in kg: 16.6

Vertical Pattern


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2.3.3 X 90° T2 900MHz 2.5m

Rural area with mechanical uptilt Antenna


APX909014-T6 Series

Electrical specification Gain in dBi: 15.9 Polarization: +/-45° HPBW: 90° VBW: 7° Electrical downtilt: 6°


306 x 120 Weight in kg: 15.5

Vertical Pattern


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2.3.4 V 65° T0 900MHz 2.0m

Highway Antenna

RFS CELLite® Panel Vertical Polarized Antenna 872-960 MHz

AP906516-T0 Series

Electrical specification Gain in dBi: 17.5 Polarization: Vertical HBW: 65° VBW: 8.5° Electrical downtilt: 0°


265 x 130 Weight in kg: 10.9

Vertical Pattern


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2.3.5 V 90° T0 900MHz 2.0m

Rural Area Antenna


AP909014-T0 Series



265 x 130 Weight in kg: 9.5

Vertical Pattern


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2.3.6 X 65° T6 1800MHz 1.3m



APX186515-T6 Series




Vertical Pattern


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2.3.7 X 65° T2 1800MHz 1.3m



APX186515-T2 Series




Vertical Pattern


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2.3.8 X 65° T2 1800MHz 1.9m

Highway Antenna


APX186516-T2 Series

Electrical specification Gain in dBi: 18.3 Polarization: +/-45° HBW: 65° VBW: 4.5° Electrical downtilt: 2°



Vertical Pattern


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2.3.9 V 65° T2 1800MHz 1.3m

Highway Antenna


AP186516-T2 Series




Horizontal Pattern


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2.3.10 V 90° T2 1800MHz 1.9m

Highway Antenna


AP189016-T2 Series




Vertical Pattern


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2 Coverage Planning

2.4 Cable Parameters


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2.4.1 7/8" CELLFLEX® Low-Loss Coaxial Cable

Feeder Cable 7/8" CELLFLEX® Low-Loss Foam-

Dielectric Coaxial Cable LCF78-50J Standard LCF78-50JFN Flame Retardant

• Installation temperature >-25°C

Electrical specification 900MHz Attenuation: 3.87dB/100m Average power in kW: 2.65


Mechanical specification Cable weight kg\m: 0.53 Minimum bending radius

• Single bend in mm: 120• Repeated bends in mm: 250

Bending moment in Nm: 13.0 Recommended clamp spacing: 0.8m


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2.4.2 1-1/4" CELLFLEX® Coaxial Cable

Feeder Cable 1-1/4" CELLFLEX® Low-Loss Foam-









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2.4.3 1-5/8" CELLFLEX® Coaxial Cable

Feeder Cable 1-5/8" CELLFLEX® Low-Loss Foam-









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2.4.4 1/2" CELLFLEX® Jumper Cable

CELLFLEX® LCF12-50J Jumpers Feeder Cable

• LCF12-50J CELLFLEX® Low-Loss Foam-Dielectric Coaxial Cable

Connectors• 7/16” DIN male/female• N male/female• Right angle

Molded version available in 1m, 2m, 3m

Mechanical specification Minimum bending radius

• Repeated bends in mm: 125

Electrical specification 900MHz Attenuation: 0.068db/m Total losses with connectors are

0.108dB, 0.176dB and 0.244dB

Electrical specification 1800MHz Attenuation: 0.099dB/m Total losses with connectors are

0.139dB, 0.238dB and 0.337dB


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2 Coverage Planning

2.5 Radio Propagation


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2.5 Radio Propagation

2.5.1 Propagation effects

Free space loss Fresnel ellipsoid Reflection, Refraction, Scattering

in the atmosphere at a boundary to another material

Diffraction at small obstacles over round earth

Attenuation Rain attenuation Gas absorption

Fading


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ϕ

P0

∆h


2.5.1.1 Reflection

Pr = Rh/v ⋅ P0

Rh/v = f(ϕ, ε, σ, ∆h) horizontal reflection factorvertical reflection factorangle of incidencepermittivityconductivitysurface roughness

Rh

Rv

ϕεσ∆h

Pr


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2.5.1.2 Refraction

k = 4/3

k = 1 k = 2/3

k =

true earth

Ray paths with different k over true

∞

Considered via an effective earth radius factor k

Radio path plotted as a straight line by changing the earth's radius

k = 4/3k = 1

k = 2/3

k =

radio path

∞


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2.5.1.3 Diffraction

Occurs at objects which sizes are in the order of the wavelength λRadio waves are ‘bent’ or ‘curved’ around objects Bending angle increases if object thickness is smaller compared to λ Influence of the object causes an attenuation: diffraction loss

diffractedradio shadow

zone obstacle

radio


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2.5.1.4 Fading

Caused by delay spread of original signal Multi path propagation Time-dependent variations in heterogeneity of environment Movement of receiver

Short-term fading, fast fading This fading is characterised by phase summation and cancellation of signal

components, which travel on multiple paths. The variation is in the order of the considered wavelength.

Their statistical behaviour is described by the Rayleigh distribution (for non-LOS signals) and the Rice distribution (for LOS signals), respectively.

In GSM, it is already considered by the sensitivity values, which take the error correction capability into account.


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2.5.1.5 Fading types

Mid-term fading, lognormal fading Mid-term field strength variations caused by objects in the size of 10...100m

(cars, trees, buildings). These variations are lognormal distributed.

Long-term fading, slow fading Long-term variations caused by large objects like large buildings, forests, hills,

earth curvature (> 100m). Like the mid-term field strength variations, these variations are lognormal distributed.


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2.5.1.6 Signal Variation due to Fading

-70

-60

-50

-40

-30

-20

-10

0

0.1

2.8

5.4

8.0

10.6

13.2

15.9

18.5

21.1

23.7

26.3

29.0

31.6

34.2

36.8

39.4

42.1

44.7

47.3

49.9

Distance [m]

Rec

eive

dPo

wer

[dB

m]

Lognormal fadingRaleygh fading

Fading hole

Raylaight/Rician Fading: Fast Fading.

Rayleight : Statistical behaviour of Fast Fading signals for NON LOS-Signals.

Lognormal Fading


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2.5.1.7 Lognormal Fading

Lognormal fading (typical 20 dB loss by entering a village)

Fading hole

Lognormal fading (entering a tunnel)


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2 Coverage Planning

2.6 Path Loss Prediction


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2.6.1 Free Space Loss

The simplest form of wave propagation is the free-space propagation The according path loss can be calculated with the following formula Path Loss in Free Space Propagation

L free space loss d distance between transmitter and receiver antenna f operating frequency

L dkm

fMHzfreespace = + ⋅ + ⋅324 20 20. log log


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2.6.2 Fresnel Ellipsoid

The free space loss formula can only be applied if the direct line-of-sight (LOS) between transmitter and receiver is not obstructed This is the case, if a specific region around the LOS is cleared from any obstacles The region is called Fresnel ellipsoid

Transmitter

Receiver

LOS


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2.6.3 Fresnel Ellipsoid

21

21

ddddr+⋅⋅= λ

The Fresnel ellipsoid is the set of all points around the LOS where the total length of the connecting lines to the transmitter and the receiver is longer than the LOS length by exactly half a wavelength It can be shown that this region is carrying the main power flow from transmitter to receiver

Transmitter Receiver

LOS

LOS + λ/2

Fresnel zone


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2.6.4 Knife Edge Diffraction

1st Fresnel zone

r

BTS

MS

d1 d2

h0

line of sight

path of diffracted wave

d1 d2

h0

replaced obstacle (knife edge)

h0 = height of obstacle over line of sight

d1, d2 = distance of obstacle from BTS and MS

• Knife edge diffraction

In case of an obstruction of the LOS path, the free-space formula with an additional correction term can be used if the obstacle is small compared to the distance from transmitter to receiver. Based on the assumption that this obstacle can be replaced by an ideal conducting half-plane which extends to infinity in the direction perpendicular to the propagation path and which is of infinitesimal thickness („knife-edge“), this situation refers to a field theory problem which can be solved in a deterministic way.

In the case that this knife-edge obstacle type enters the Fresnel region, diffraction occurs (similar to the diffraction known from optics) and introduces some additional diffraction loss compared to the free-space propagation.

The diffraction loss can be described by

with h0 the height of the obstacle above the LOS. v is a parameter which represents the number of „cleared“Fresnel ellipsoids. The function F(v) is shown in . One can see that the diffraction loss is 6dB if the obstacle is just touching the LOS.

λ2where)(

21

210

0 ⋅⋅+

⋅−=−==ddddh

rhvvFLdiff


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2.6.5 Knife Edge Diffraction Function

Knife-edge diffraction function

-5

0

5

10

15

20

25

30

35

-9 -8 -7 -6 -5 -4 -3 -2 -1 0 1 2 3

Clearance of Fresnel ellipsoid (v)

F(v)

[dB]

Additional diffraction loss F(v)v: clearance parameter, v=-h0/rNote: h0 = 0 ⇒ v =0 ⇒ L = 6 dB

V=0:1=0

The function F(v) is shown on the top . One can see that the diffraction loss is 6dB if the obstacle is just touching the LOS. For v>1, some oscillation is noted, which appears due to the fact that the obstacle moves over several Fresnel regions where the phase of the transmitted signal is alternating between +180° and -180° phase shift.

In reality, the conductivity of the obstacle´s material is not ideal, and the oscillations appears „smoothed“ to an average value.

h0

r

d1 d2

LOS

h0

LOS


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2.6.6 "Final Solution" for Wave Propagation Calculations?

Exact field solution requires too much computer resources! Too much details required for input Exact calculation too time-consuming Field strength prediction rather than calculation

Requirements for field strength prediction models Reasonable amount of input data Fast (it is very important to see the impact of changes in the network layout

immediately) Accurate (results influence the hardware cost directly) Tradeoff required (accurate results within a suitable time) Parameter tuning according to real measurements should be possible


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2.6.7 CCIR Recommendation

The CCIR Recommendations provide various propagation curves Based on Okumura (1968) Example (CCIR Report 567-3):

Median field strength in urban areaFrequency = 900 MHzhMS = 1.5 mDashed line: free space

How to use this experience in field strength prediction models? Model which fits the curves in certain ranges

→ Hata's modelwas modified later by the European Cooperation in Science and Technology (COST): COST 231 Hata/Okumura


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2.6.8 Mobile Radio Propagation

Free-space propagation (Fresnel zone not obstructed) → L ~ d2

Fresnel zone heavily obstructed near the mobile station → L ~ d3.7

d


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2.6.9 Terrain Modeling

Topography Effective antenna height Knife edge diffraction

• single obstacles• multiple obstacles

Surface shape/Morpho-structure Correction factors for Hata-Okumura

formula


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2.6.10 Effect of Morphostructure on Propagation Loss

Open area Open areaUrban area

Distance

Fiel

dstr

engt

h

urban area

open area


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Path loss (Lu) is calculated (in dB) as follows:

Lu= A1 + A2 log(f) + A3 log(hBTS) + (B1 + B2log(hBTS)) log d

The parameters A1, A2, A3, B1 and B2 can be user-defined. Default values are proposed in the table below:


2.6.11 Okumura-Hata for GSM 900

-6.55-6.55B2

44.9044.90B1

-13.82-13.82A3

33.9026.16A2

46.3069.55A1

Cost-HataF>1500 MHz

Okumura-Hataf< 1500 MHz

Parameters

Hata formula empirically describes the path loss as a function of frequency, receiver-transmitter distance and antenna heights for an urban environment. This formula is valid for flat, urban environments and 1.5 metre mobile antenna height.


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2.6.12 CORRECTIONS TO THE HATA FORMULA

As described above, the Hata formula is valid for urban environment and a receiver antenna height of 1.5m. For other environments and mobile antenna heights, corrective formulas must be applied.

Lmodel1=Lu-a(hMS) for large city and urban environments

Lmodel1=Lu-a(hMS) -2log² (f/28) -5.4 for suburban area

Lmodel1=Lu -a(hMS) - 4.78log² (f)+ 18.33 log(f) – 40.94 for rural area

a(hMS) is a correction factor to take into account a receiver antenna height different from 1.5m.

3.2log² (11.75hMS) – 4.97Large city

(1.1log(f) – 0.7)hMS – (1.56log(f) -0.8)Rural/Small city

A(hMS)Environments

Note: When receiver antenna height equals 1.5m, a(hMS) is close to 0 dB regardless of frequency.


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2.6.13 Hata-Okumura for GSM 900

Formula valid for frequency range: 150…1000 MHz

Lmorpho [dB] Morpho/surface shape-Correction factor 0 dB: ‘Skyscrapers’->27 dB: ‘open area’

f [MHz] Frequency (150 - 1000 MHz)hBTS [m] Height of BTS (30 - 200 m)hMS [m] Height of Mobile (1 - 10m)d [km] Distance between BTS and MS (1 - 20 km)

Power law exponent shown colored

LossHata = 69.55 + 26.16 log (f) - 13.82 log (hBTS)- a(hMS) +(44.9 - 6.55 log (hBTS)) log (d) - Lmorpho

a (hMS) = (1.1 log (f) - 0.7) hMS - (1.56 log (f) - 0.8)

2.6 Path Loss Prediction 2.6 Path Loss Prediction


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2.6.14 COST 231 Hata-Okumura GSM 1800

Formula is valid for frequency range: 1500...2000 MHz Hata’s model is extended for GSM 1800

Modification of original formula to the new frequency range

For cells with small ranges the COST 231 Walfish-Ikegami model is more precisely

LossHata = 46.3 + 33.9 log (f) - 13.82 log (hBTS)- a(hMS) +(44.9 - 6.55 log (hBTS)) log (d) - Lmorpho

a (hMS) = (1.1 log (f) - 0.7) hMS - (1.56 log (f) -0.8)


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With: K1: constant offset (dB). K2: multiplying factor for log(d). d: distance between the receiver and the transmitter (m). K3: multiplying factor for log(HTxeff). HTxeff: effective height of the transmitter antenna (m). K4: multiplying factor for diffraction calculation. K4 has to be a positive number. Diffraction loss: loss due to diffraction over an obstructed path (dB). K5: multiplying factor for log(HTxeff)log(d). K6: multiplying factor for . : effective mobile antenna height (m). Kclutter: multiplying factor for f(clutter). f(clutter): average of weighted losses due to clutter.

( ) ( ) ( ) ( ) ( ) ( )clutterfKHKHdKlossnDiffractioKHKdKKL clutterRxeffTxeffTxeffel ++×+×+++= 654321mod loglog loglog


2.6.15 Alcatel Propagation Model (Standard Propagation Model)


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2.6.16 Alcatel Propagation Model

Using of effective antenna height in the Hata-Okumura formula:

ΤhRx eff = f(α, d, hBTS, hMS)


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2.6.17 Exercise ‘Path Loss’

Scenario Height BTS = 40m Height MS = 1.5m D (BTS to MS) = 2000m

1. Calculate free space loss for A.) f=900MHz B.) f=1800MHz

2. Calculate the path loss for f = 900MHz A.) Morpho class ‘skyscraper’ B.) Morpho class ‘open area’

3. Calculate the path loss for f = 1800MHz A.) Morpho class ‘skyscraper’ B.) Morpho class ‘open area’

Morpho correction factors:

-Skyscraper: 0dB;

-Open area: 27dB

1. Calculate free space loss for

A.) f=900MHz: 97.6dB

B.) f=1800MHz: 103.6dB

2. Calculate the path loss for f = 900MHz

A.) Morpho class ‘skyscraper’: 135dB

B.) Morpho class ‘open area’: 108dB

3. Calculate the path loss for f = 1800MHz

A.) Morpho class ‘skyscraper’: 144.8dB

B.) Morpho class ‘open area’: 117.8dB


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2 Coverage Planning

2.7 Link Budget Calculation


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2.7.1 Maximum Propagation Loss (Downlink)

Feeder Cable LossLcable = 3 dB

BTS Antenna GainGantBS = 16.5 dBi

Effective Isotropic Radiated PowerEIRPBTS = 59.5 dBm

MS Antenna GainGantMS = 2 dBi

Internal LossesLint = 2 dB

ALCATEL EvoliumTM

Propagation LossLprop

Minimum Received PowerPRX,min,MS = -102 dBm

Maximum allowed downlink propagation loss: Lprop,max = EIRPBTS - PRX,min,MS = 161.5 dB

MS RXSensitivity-102 dBm

Output Power at antenna connector 46.0 dBm

Add. Losses:

ANx = 1.8 dB

ANy = 3.5 dB

----------

5.3 dB

Pathloss without ANy = 153.6 dB


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Max. allowed uplink propagation loss: Lprop,max = EIRPMS - PRX,min,BTS = 157.5 dBWith antenna diversity gain of 3dB: Lprop,max,AD = EIRPMS - PRX,min,BTS + GAD = 160.5 dBWith TMA compensating cable loss: Lprop,max,AD,TMA = EIRPMS - PRX,min,BTS + GAD + GTMA = 163.5 dB


2.7.2 Maximum Propagation Loss (Uplink)

Feeder Cable LossLcable = 3 dB

BTS Antenna GainGantBS = 16.5 dBi

Minimum Received PowerPRX,min,BTS = -124.5 dBm

MS Antenna GainGantMS = 2 dBi

Internal LossesLint = 2 dB

ALCATEL EvoliumTM

Propagation LossLprop

EIRPMS = 33 dBm

MS TX Power33 dBm

Receiving sensitivity at ant. conn. -111 dBm

AD = Antenna Diversity ~3dB Gain

TMA = Tower Mounted Amplifier ~3-4 dB Gain


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2.7.3 GSM900 Macro Evolium Evolution A9100 BTS

dB133,0dB133,0Max. Pathloss

dBm-87,0dBm-104,0Isotr. Rec. Power:

dB0,0Antenna Pre-Ampl.

dB0,0dB0,0Degradation (no FH)

90,9%

dB8,0dB8,0Lognormal Margin 50%→

dB3,0dB3,0Interferer Margin

dB3,0Diversity Gain

dBi2,0dBi11,0Antenna Gain

dB2,0dB3,0Cables, Connectors Loss

dB4,0Body/Indoor Loss

dBm-102,0dBm-104,0Rec. Sensitivity

DownlinkUplinkRX

dBm46,0dBm29,0EIRP

dBi11,0dBi2,0Antenna Gain

dB4,0Body/Indoor Loss

dB3,0dB2,0Cable,Connectors Loss

dBm38,0dBm33,0Output Power

dB3,0dB0,0Comb+Filter Loss, Tol.

dBm41,0dBm33,0Internal Power

DownlinkUplinkTXBS to MSMS to BS


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2.7.4 GSM1800 Link Budget

TX Uplink DownlinkInternal Power 33 dBm 45.4 dBmComb+Filter Loss - 0 dBm - 5.3 dBmOutput Power 33 dBm 40.1 dBmCable+Conn Loss - 2 dB - 3 dBmBody/Indoor Loss - 4 dBAntenna Gain + 2 dBi + 11 dBiEIRP 29.0 dBm 48.1 dBm

RX Uplink DownlinkRec. Sensitivity - 109 dBm - 102 dBmBody/Indoor Loss + 4 dBCables, Con. Loss + 3 dB + 2 dBAntenna Gain - 11 dBi - 2 dBiDiversity Gain - 3 dBiInterferer Margin + 3 dB + 3 dBLognormal Margin + 8 dB + 8 dB

Isotr. Rec. Power - 109 dB - 87 dBmMax. Pathloss 138 dB 135.1 dB


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2.7.5 Additional Losses Overview

Loss type Reason Value

Indoor loss Electrical properties of wall material 20dB (3...30dB)

Incar loss Brass influencing radio waves 7dB (4...10dB)

Body loss Absorption of radio waves by thehuman body

3dB (0...8dB)

Interferer margin Both signal-to-noise ratio and C/I low 3 dB

Lognormal margin Receiving the minimum field strengthwith a higher probability

According toprobability


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2 Coverage Planning

2.8 Coverage Probability


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2.8.1 Indoor propagation aspects

Penetration Loss

Multiple Refraction

Multiple Reflection

Exact modeling of

indoor environment

not possible Practical solution:

empirical model!


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2.8.2 Indoor propagation: empirical model

d

Additional Loss in [dB] relative to loss at vertical incidence

Power relative to power at d=0

ϕ

d

0

5

10

15

20

25

30

35

0 6 12 18 24 30 36 42 48 54 60 66 72 78 84 90

Angle of incidence in degree

Ad

dit

ion

ala

tten

ua

tion

ind

B


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2.8.3 Indoor Penetration

Incident wave

Incident wave

Lindoor = 3 ... 15 dB

Lindoor = 13 ... 25 dBLindoor = ∞ dB (deep basement)

Lindoor = 17 ... 28 dB

-2.7 dB / floor(1st ... 10th floor)

-0.3 dB / floor(11th ... 100th floor)

Lindoor = 7 ... 18 dB(ground floor)

Depending on environment

Line-of-sight to antenna? Interior unknown

general assumptions


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2.8.4 Body Loss (1)

Measured attenuation versus

time for a test person walking

around in ananechoic chamber


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2.8.5 Body Loss (2)

Head modeled as sphere

Calculation model

Near field of MS antenna•without head•with head


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2.8.6 Body Loss (3)

Indirect measured field strength penetrated into the

head (horizontal cut)

Test equipment for indirectfield strength measurements


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2.8.7 Interference Margin

In GSM, the defined minimum carrier-to-interferer ration (C/I) threshold of 9 dB is only valid if the received server signal is not too weak.

In the case that e.g. the defined system threshold for the BTS of -111dBm is approached, a higher value of C/I is required in order to maintain the speech quality.

According to GSM, this is done by taking into account a correction of 3 dB.


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2.8.8 Degradation (no FH)

GSM uses a frame correction system, which works with checksum coding and convolutional codes.

Under defined conditions, this frame correction works successfully and copes even with fast fading types as Rayleigh or Rician fading.

For lower mobile speed or stationary use, the fading has a bigger influence on the bit error rate and hence the speech quality is reduced.

In such a case, a degradation margin must be applied. The margindepends on the mobile speed and the usage of slow frequency hopping, which can improve the situation for slow mobiles again.


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2.8.9 Diversity Gain

This designates the optional usage of a second receiver antenna. The second antenna is placed in a way, which provides some

decorrelation of the received signals. In a suitable combiner, the signals are processed in order to achieve a

sum signal with a smaller fading variation range. Depending on the receiver type, the signal correlation, and the antenna

orientation, a diversity gain from 2…6 dB is possible.


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2.8.10 Lognormal margin

Lognormal margin is also called fading margin Due to fading effects, the minimum isotropic power is only received with a certain

probability Signal statistics, lognormal distribution with median power value Fmed and standard deviation σ

(sigma) Without any margin, the probability is 50%, which is not a sufficient value in order to

provide a good call success rate. A typical design goal should be a coverage probability of 90...95%. The following

normalised table can be applied to find fading margins for different values of σ. The fading margin is calculated by multiplying the value of k (in the table) with the standard deviation:

Lognormal/Fading Margin = kσ.

k -∞ -0.5 0 1 1.3 1.65 2 2.33 +∞

Coverage Probability

0% 30% 50% 84% 90% 95% 97.7%

99% 100%

k -∞ -0.5 0 1 1.3 1.65 2 2.33 +∞

Coverage Probability

0% 30% 50% 84% 90% 95% 97.7%

99% 100%

kk -∞-∞ -0.5-0.5 00 11 1.31.3 1.651.65 22 2.332.33 +∞+∞

Coverage Probability Coverage

Probability 0%0% 30%30% 50%50% 84%84% 90%90% 95%95% 97.7

%97.7%

99%99% 100%

100%


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2.8.11 Consideration of Signal Statistics (1)

100 m10

0m

BS

x

Field strength at location xlognormally distributedarround Fmedian


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2.8.12 Consideration of Signal Statistics (2)

0

0,05

0,1

0,15

0,2

0,25

0,3

received signal level F [dBm]

PDF

Local coverage probability: Pcov = P [ F > Fthreshold ]

σ

FmedianFthreshold

Area representing thecoverage probability

probability density function (pdf)

Folie large Scale (slow) Fading:

The lognormal distribution, described by a mean fieldstrength Fmed and a standard deviation s, is shown in the diagram. A coverage probability Pcov can be calculated, which defines the chance that a certain fieldstrengththreshold Fthr is reached or exceeded by the calculated (or predicted) mean fieldstrength level Fmed.

The variation of the probability in dependence on Fmed is shown in the diagram. The required difference between Fmed and Fthr in order to achieve a required probability is called the fading margin.

Without any margin, the probability is 50% (Fmedian), which is not a sufficient value in order to provide a good call success rate. A typical design goal should be a coverage probability of 90...95%. This can be reached by applying a factor s (Fthreshold). (Additional System margin). -> Next Chapter


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2 Coverage Planning

2.9 Cell Range Calcolation


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For what Radius R is the average coverage probability in the cell area 95% ?

2.9 Cell Range Calculation

2.9.1 Calculation of Coverage Radius R

r = distance between BTS and MSFrec = received powerσ = Standard deviation

F rec, thr

F rec

Frec,med (r)

0 r

σ

R

R

<Pcov(R)> = = 0.95∫20

π

πR²

Pcov (r) dr !

Frec,med (r) = EIRP - LossHata (r)

Loss Hata = f(hBS, hMS, f, r) + Kmor

Pcov(r)= P(Frec (r) > Frec,thr)

R = f (hBS, hMS, f, Kmor, EIRP, Frec,thr)


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2.9.2 Coverage Probability

0

0,5

0,951

Pcov (r)

R r

Pcov = P ( Frec > Frec, thr )


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2.9.3 Coverage Ranges and Hata Correction Factors

Area Coverage Probability

70%

75%

80%

85%

90%

95%

100%

0,0 1,5 3,0 4,5 6,0 7,5 9,0 10,5

d [km]

P cov

155

150

145

140

135

130

125

120

115

110

ReferencePathloss [dB]

Calculation conditions:

Correction = 3; Sigma = 7hBS = 30 m; hMS = 1.7m; f = 900 Mhz

Clutter type Cor [dB] σ [dB]

Skyscrapers 0 6Dense urban 2 6Medium urban 4 7Lower urban 6 7Residential 8 6Industrial zone 10 10Forest 8 8Agricultural 20 6Low tree density 15 8Water 27 5Open area 27 6

The lognormal distribution, described by a mean fieldstrength Fmed and a standard deviation s, is shown in in the left diagram. A coverage probability Pcov can be calculated, which defines the chance that a certain fieldstrengththreshold Fthr is reached or exceeded by the calculated (or predicted) mean fieldstrength level Fmed. This probability is represented by the area enclosed by the graph of the probability density function and the vertical line at F=Fthrin the left diagram. The variation of the probability in dependence on Fmed is shown in the right diagram. The required difference between Fmed and Fthr in order to achieve a required probability is called the fading margin.

Without any margin, the probability is 50%, which is not a sufficient value in order to provide a good call success rate. A typical design goal should be a coverage probability of 90...95%. The following normalized table can be applied to find fading margins for different values of s. The fading margin is calculated by multiplying the value of k (in the table) with the standard deviation (Fading Margin = k s).

k -∞ -0.5 0 1 1.3 1.65 2 2.33 +∞Coverage

Probability 0% 30% 50% 84% 90% 95% 97.7% 99% 100%


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2.9.4 Conventional BTS Configuration

ALCATEL EvoliumTM

TX → 45.4 dBmRX → -109dBm

TX

TXan

dRX

1 BTS Omnidirectional antenna for both TX and RXCoverage Range R0

Coverage Area A0

R0

A0


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2.9.5 Coverage Improvement by Antenna Diversity

ALCATEL EvoliumTM

TX → 45.4 dBmRX → -109dBm

TX RX D

IV

RX

an

dTX

1 BTS Omnidirectional antennas

one for both RX and TX one for RXDIV

Antenna diversity gain (2...6 dB) Example: 3 dB

Coverage rangeRDiv = 1.23 · R0

Coverage areaADiv = 1.5 · A0

R0RDiv

A0

ADiv


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2.9.6 Radiation Patterns and Range

3 antennas at sector site,Gain: 18 dBi, HPBW: 65°

Resulting antenna footprint ("cloverleaf")compared to an 11 dBi omni antenna

omni

sector


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2.9.7 Improvement by Antenna Diversity and Sectorization

TX

RX D

IV

3 BTS Directional antennas (18 dBi) Antenna diversity (3 dB)Max. coverage range

Rsec,div = 1.95 · R0

Coverage areaAsec,div = 3 · A0

ALCATELEvoliumTM

ALCATELEvoliumTM

ALCATELEvoliumTM

R0

Rsec,div

Asec,div


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2.9.8 Improvement by Antenna Preamplifier

TX

RX D

IV

3 BTS Directional antennas (18 dBi) Antenna diversity (3 dB) Antenna preamplifier (3dB) Max. coverage range

Rsec,div,pre = 2.22 · R0

Coverage areaAsec,div,pre = 3.9 · A0

General:Asec = g · A0

g: Area gain factorR0

Rsec,div,pre

Asec,div,pre

ALCATELEvoliumTM

ALCATELEvoliumTM

ALCATELEvoliumTM


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2 Coverage Planning

2.10 Antenna Engineering


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2.10.1 Omni Antennas

Application Large area coverage Umbrella cell for micro cell layer

Advantages Continuous coverage around the site Simple antenna mounting Ideal for homogeneous terrain

Drawbacks No mechanical tilt possible Clearance of antenna required Densification of network difficult


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2.10.2 Sector Antenna

Antenna with horizontal HPBW of e.g. 90° or 65° Advantages

Coverage can be focussed on special areas Low coverage of areas of no interest (e.g. forest) Allows high traffic load Additional mechanical downtilt possible Wall mounting possible

Drawbacks More frequencies needed per site compared to omni sites More hardware needed Lower coverage area per sector


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2.10.3 Typical Applications

Wide horizontal beam width (e.g. 90°) For areas with few reflecting and scattering objects (rural area) Area coverage for 3-sector sites Sufficient cell overlap to allow successful handovers

Small horizontal beam width (e.g. 65°) For areas with high scattering (city areas) Coverage between sectors by scattering and by adjacent sites (mostly site

densification in urban areas)


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2.10.4 Antenna Tilt

Downtilting of the Antenna main beam related to the horizontal line

Goals: Reduction of overshoot Removal of insular coverage Lowering the interference Coverage improvement of the near area (indoor coverage) Adjustment of cell borders (handover zones)

Mechanical / Electrical or Combined downtilt


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2.10.5 Mechanical Downtilt

Advantages Later adjustment of vertical tilt possible Antenna diagram is not changed, i.e. nulls and side lobes remain in

their position relative to the main beam Cost effective (single antenna type may be used) Fast adjustments possible

Drawbacks Side lobes are less tilted Accurate adjustment is difficult Problems for sites with difficult access


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2.10.6 Electrical Downtilt

Advantages Same tilt for both

main and side lobes Antenna mounting is more simple → no

adjustment errors

Drawbacks Introduction of additional antenna types necessary New antenna installation at the site if downtilting is introduced Long antenna optimization phase Adjustment of electrical tilt mostly not possible

τ = 0

τ = t

τ = 2 t

τ = 3 t

τ = delay time

downtilt angle


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2.10.7 Combined Downtilt

Combination of both mechanical and electrical downtilt High electrical downtilt: Distinct range reduction in sidelobe direction

(interference reduction) Less mechanical uptilt in main beam direction

Choose sector antennas with high electrical downtilt (6°...8°) and apply mechanical uptilt installation for optimum coverage range in main beam direction


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2.10.8 Assessment of Required Tilts

Required tilt is estimated using Geometrical Optics

Consideration of Vertical HPBW of the antenna Antenna height above ground Height difference antenna/location to be covered Morpho-structure in the vicinity of the antenna Topography between transmitter and receiver location

Tilt must be applied for both TX and RX antennas!


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2.10.9 Inter Site Distance in Urban Area

Using sectorized sites with antennas of 65° horizontal half power beam width

The sidelobe is approximately reduced by 10dB.

This is a reduction of cell range to 50%.

The inter site distance calculation factor depends on

Type of antenna Type of morpho class

• Multi path propagation• Scattering• Sigma (fading variations)

X XA B

0.5* R2R2


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2.10.10 Downtilt in Urban Area

Cell range R2

Main beam

0.5* R2

Side lobe

Tilt 2 Tilt 2Site A Site B

Inter Site Distance A-B = 1.5* R2


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2.10.11 Downtilt in Urban Area

The upper limit of the vertical half power beam widthis directed towards the ground at maximum cell range Upper –3dB point of the vertical antenna pattern

To be used in areas with Multi path propagation condition Good scattering of the beam

Aim Reduction of interference

Optimization Coverage Optimization in isolated cases using less downtilt Interference Reduction in isolated cases using more downtilt


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2.10.12 Downtilt in Suburban and Rural Area

Downtilt planning for Suburban Rural Highway Coverage

The main beam is directed towards the ground at maximum cell range

Main beamMain beam

Cell range R1 Cell range R1

Tilt 1 Tilt 1

Inter Site Distance C-D = 2* R1

Site C Site D


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2.10.13 Antenna configurations

Application of Duplexer Consists of a TX/RX Filter and a combiner one antenna can be saved

Tower Mounted Amplifier (TMA) Increase Uplink Sensitivity TMA needs to have TX bypass

=> in case of duplexer usage

Diversity Space diversity Polarization diversity

Rx/Tx

RxTx

DuplexFilter

To BTS


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2.10.14 Antenna Configurations for Omni and Sector Sites

Antenna Configurations for Omni and Sector Sites

RxRxdiv

TxRx

Tx

Rxdiv

Bracons

Sectorantenna

Pole

SectorAntenna

Pole

Tower mounting for omni antennas Tower mounting for directional antennas

Pole mounting for roof-top mounting

Pole mounting for wallor parapet mounting


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2.10.15 Three Sector Antenna Configuration with AD


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2.10.16 Antenna Engineering Rules

Distortion of antenna pattern: No obstacles within Antenna near field range HPBW Rule plus security margin of 20° First fresnel ellipsoid range (additional losses!)

TX-RX Decoupling to avoid blocking and intermodulation Required minimum separation of TX - RX antennas dependent on antenna

configuration (e.g. duplexer or not)

Diversity gain Required antenna separation for space diversity


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2.10.17 Distortion of antenna pattern

Antenna Near Field Range: Rmin = 2D²/λ D = Aperture of antenna (e.g. 3m) => Rmin = 60 / 120m for GSM / DCS

HPBW Rule with securtiy margin of 20° and tilt α

Roof Top = Obstacle

ϕϕ = HPBW/2 + 20° + α

D

H

D[m] 1 5 10H[m] 0.5 2.5 5

HPBW = 8°, α = 2°


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2.10.18 Tx-Rx Decoupling (1)

TX

RX

fuse

fint

f[MHz]

P [dBm]

fuse fint

-101

-13

n*200kHz

Pout

Pin

ReceiverCharacteristic

Pblock

P1dB

Out of Band Blocking Requirement (GSM Rec. 11.21) GSM 900 = +8 dBm GSM 1800 = 0 dBm

Required Decoupling (n = number of transmitters)

TX-TX = 20 dB TX-RX GSM = 30 + 10 log (n) dB TX-RX DCS = 40 + 10 log (n) dB


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2.10.19 TX-RX Decoupling (2)

Horizontal separation (Approximation)

IH=22+20log(d

H/λ)-(G

T+G

R) [dB]

dH

Isolation for Horizontal Separation - omni 11dBi

15

20

25

30

35

40

45

1,7 2,7 3,7 4,7 5,7 6,7 7,7 8,7 9,7 10,4

10,8

11,2

11,6 12 12

,412

,813

,213

,6 14 14,4

14,8

15,2

Separation [m]

Isol

atio

n[d

B]

GSM1800

GSM900


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2.10.20 TX-RX Decoupling (3)

Vertical separation (Approximation)

IV=28+40log(d

V/λ) [dB]

dv

dm

Mast

Isolation for Vertical Separation

0

10

20

30

40

50

60

70

0,2 0,3 0,4 0,5 0,6 0,7 0,8 0,9 1

Separation [m]

Isol

atio

n[d

B] GSM1800

GSM900


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Required separation for max. diversity gain = F(λ)


2.10.21 Space Diversity

dH

RXA RXB dV

RXA

RXBFor a sufficient low correlation coefficient ρ < 0.7:

dH = 20λ => GSM 900: 6m / GSM1800: 3m

dV = 15λ => GSM 900: 4.5m / GSM1800: 2.25m


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2.10.22 Power Divider

Power dividers connect severalantennas to one feeder cable

For combination of individualantenna patterns for a requested configuration Quasi-omni configuration Bidirectional configuration

(road coverage)

4-to-1 Power splitter(6 dB loss)

To BTS: Receiver input

To BTS: Duplexer output(TX plus RX diversity)

Quasi-OmniConfiguration


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Power divider Also called "power splitter" or "junction box" Passive device (works in both (transmit and receive)

direction)

3 dB

Pin

Pin

2Pin

2

Pin

3

4.5 dB

Pin

Pin

3Pin

3

6 dB

Pin

Pin

4Pin

4Pin

4Pin

4


2.10.23 Power Divider


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2.10.24 Panel Configurations (1)

Radial Arrangementof 6 Panel Antennas with horizontal beamwidth = 105 °gain = 16.5 dBi, mast radius = 0.425 m, mounting radius = 0.575 m


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Example 2: Quasi Omni Arrangementof 3 antennas with horizontal beamwidth = 105 °, gain =13.5 dBi,mounting radius = 4 m


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Example 3: Skrew Arrangement

of 4 Panel Antennas with horizontal beamwidth = 65 °,gain = 12.5 dBi, mast radius = 1 m,mounting radius = 1.615 m


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2.10.27 Feeders

Technical summary

Inner conductor: Copper wire

Dielectric: Low density foam PE

Outer conductor: Corrugated copper tube

Jacket: Polyethylene (PE)black

Inner conductor Outer conductor

Dielectric Jacket


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2.10.28 Feeder Installation Set and Connectors

1Cable Clamps2Antenna Cable3Double Bearing4Counterpart5Anchor tape

7/16 Connector:Coaxial ConnectorRobustGood RF-Performance


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Type Minimum bending radius Jacket(outer diameter)

Weight (m) Recommendedclamp spacing

Single bending Repeated bending

LCF 1/2’’ 70 mm 210 mm 16 mm 0.35 kg 0.6 m

LCF 7/8’’ 120 mm 360 mm 28 mm 0.62 kg 0.8 m

LCF 1 5/8’’ 300 mm 900 mm 49.7 mm 1.5 kg 1.2 m

These values are based on feeder types with an impedance of 50 ohms

GSM 900 GSM 1800 GSM 1900

Type Attenuation /100 m [dB]

Recommendedmax length [m]

Attenuation /100 m [dB]


Attenuation /100 m [dB]


LCF 1/2“ 6.6 45 10.3 30 10.6 28LCF 7/8“ 4.0 75 6.0 50 6.3 47LCF 1_5/8“ 2.6 115 4.0 75 4.2 71


2.10.29 Feeder Parameters


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2.10.30 Feeder attenuation (1)

Main contribution is given by feeder loss Feeder Cable 4dB/100m => length 50m Loss =2.0dB Jumper Cable 0.066dB/1m => 5m Loss =0.33dB Insertion Loss of connector and power splitter < 0.1dB Total Loss 2.0dB+2x0.33dB+5x0.1dB+0.1dB =3.26dB

Cable type is trade off between Handling flexibility Cost Attenuation


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2.10.31 Radiating Cables

Provide coverage in Tunnels, buildings, along side tracks or lines

Principle: Radiate a weak but constant electromagnetic wave

Suitable for coverage over longer distances (Repeater)

Fieldstrength distribution more constant as with antennas

F

FThr

Repeater

F

FThr

Terminat-ing Load


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Components are shown with black lines

BTS

Tx

Rx

Radiating cable Termination load

Earthing kitMounting clips with 50 mm wall standoff

N-connections

Jumper cabel

1-leg radiating cable system


2.10.32 Components of a radiating cable system


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-40

-50

-60

-70

-80

-90

-100

-110

[dBm]

Cable attenuationbetween the antennas

Radiating cable field strength

Antenna field strength

Distance

2.10 Antenna Engineering 2.10.33 Comparison of field strength: Radiating cable and standard antenna


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Example of a radiating cable in a tunnel


2.10.34 Example of a radiating cable in a tunnel


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2.10.35 Microwave antennas, feeders and accessories

Microwave point to point systems use highly directional antennas Gain

with G = gain over isotropic, in dBiA = area of antenna aperturee = antenna efficiency

Used antenna types parabolic antenna high performance antenna horn lens antenna horn antenna

G A e= 10 42lg π

λ


Parabolic dish, illuminated by a feed horn at its focus.

Available in a wide variety of sizes [1’ (0.3 m), 2’ (0.6 m), 4’ (1.2 m), 6’ (1.8 m), 8’ (2.4 m), 10’ (3.0 m) and sometimes up to 16’ (4.8 m) in most frequency bands.

Sizes over 4’ are seldom used due to the installation restrictions on private buildings

Mostly with single plane polarised feed, which can be either vertical (V) or horizontal (H)

Dual polarized feeds (DP), with separate V and H connections possible

DP`s usually have lower gain than single polarized antennas

Front-to-back ratios of about 45 dB are not high enough to use these antennas back-to-back on the same frequency (interference calculations)

Antenna patterns are absolutely necessary for interference calculations

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2.10.36 Parabolic antenna

Parabolic dish, illuminated by a feed horn at its focus

Available sizes: 1’ (0.3 m) up to 16’ (4.8 m)

Sizes over 4’ seldom used due to installation restrictions

Single plane polarized feed vertical (V) or horizontal (H)

Also: dual polarized feeder (DP), with separate V and H connections (lower gain)

Front-to-back ratios of 45 dB not high enough for back-to-back configuration on the same frequency

Antenna patterns are absolutely necessary for interference calculations


Similar to the common parabolic antenna, except for an attached cylindrical shield

Improvement of the front-to-back ratio, and wide angle radiation discrimination

Available in the same sizes as parabolic ones, either single or double polarised

Substantially bigger, heavier, and more expensive than the ordinary parabolics

Allow back-to-back transmision at the same frequency in both directions (refer to interference calculation)

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2.10.37 High performance antenna

Similar to common parabolic antenna, except for attached cylindrical shield

Improvement of front-to-back ratio and wide angle radiation discrimination

Available in same sizes as parabolic, single or dual polarized

Substantially bigger, heavier, and more expensive than parabolic antennas

Allow back-to-back transmission at the same frequency in both directions (refer to interference calculation)


Horn lens antenna

Only available for very high frequencies (above 25 Ghz)

Replacement for small parabolic antennas (1’)

Electrical data nearly the same, but easier to install due to their size and weight

Horn reflector antenna

Consists of a very large parabola, mounted at such an angle that the energy from the feed horn is reflected at right angle (90°)

Gain in the region of a 10’ parabolic antenna (60 dBi), but it has much higher front-to-back ratios ( 70 dB or more)

Very big, heavy and requires a complex installation procedure

Only used on high capacity microwave backbones (example: MSC-MSC interconnections).

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2.10.38 Horn antennas

Horn lens antenna For very high frequencies > 25 GHz Replacement for small parabolic

antennas (1’) Same electrical data, but easier to

install due to size and weight Horn reflector antenna Large parabola, energy from the feed

horn is reflected at right angle (90°) Gain like 10’ parabolic antenna (60

dBi), but higher front-to-back ratios > 70 dB

Big and heavy, requires a complex installation procedureOnly used on high capacity microwave backbones (e.g. MSC-MSC interconnections)


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2.10.39 Specific Microwave Antenna Parameters (1)

Cross polarization discrimination (XPD) highest level of cross polarisation radiation relative to the main

beam; should be > 30 dB for parabolic antennas

Inter-port isolation isolation between the two ports of dual polarised antennas; typical

value: better than 35 dB

Return loss (VSWR) Quality value for the adaption of antenna impedance to the

impedance of the connection cable Return loss is the ratio of the reflected power to the power fed at

the antenna input (typical> 20 dB)


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Radiation pattern envelope (RPE) Tolerance specification for antenna pattern (specification of antenna

pattern itself not suitable due to manufacturing problems) Usually available from manufacturer in vertical and horizontal

polarisation (worst values of several measurements)

Weight

Wind load


2.10.40 Specific Microwave Antenna Parameters (2)


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2.10.41 Data sheet 15 GHz

Parabolic antenna 15 GHz High performance antenna 15 GHz

Bandwidth (GHz) 14.4 - 15.35 14.4 - 15.35 14.4 - 15.35Model number PA2- 144 PA4- 144 PA6- 144Nominal diameter (m) 0.6 1.2 1.8

(ft) 2 4 6

Half-power beamwidth (deg) 2.3 1.2 0.8Gain low band (dBi) 36.2 42.3 45.8Gain mid band (dBi) 36.5 42.5 46.0Gain high band (dBi) 36.7 42.8 46.3Front-to-back ratio (dB) 42 48 52Cross polar discrimination (dB) 28 30 30Return loss (dB) 26 26 28

Weight (kg) 19 43 73WindloadElevation adjustment (deg) +/- 5 +/- 5 +/- 5

Bandwidth (GHz) 14.4 - 15.35 14.4 - 15.35 14.4 - 15.35Model number DA 2 - 144 DA 4 - 144 DA 6 - 144Nominal diameter (m) 0.6 1.2 1.8

(ft) 2 4 6

Half-power beamwidth (deg) 2.3 1.2 0.8Gain low band (dBi) 36.2 42.3 45.8Gain mid band (dBi) 36.5 42.5 46.0Gain high band (dBi) 36.7 42.8 46.3Front-to-back ratio (dB) 65 68 68Cross polar discrimination (dB) 28 30 30Return loss (dB) 26 26 26

Weight (kg) 28 55 130WindloadElevation adjustment (deg) +/- 12 +/- 12 +/- 12


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2.10.42 Radiation pattern envelope


Depending on the frequency coaxial cables and waveguides are used for the transmission of RF energy between radio systems and antennas. The most important characteristic of feeders is their loss, but alsotheir impedance (return loss).

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2.10.43 Feeders (1)

Coaxial cables or waveguides (according to frequency) Most important characteristic: loss and return loss Coaxial cables Used between 10 MHz and 3 GHz Dielectric material: foam or air Parameters of common coaxial cables:

type dielectric diameter(mm)

loss(dB/100m)

powerrating (kW)

bendingradius (mm)

LCF 1/2’ CU2Y foam 16.0 10,9 / 2 GHz 0.47 20013.8 / 3 GHz

LCF 7/8’ CU2Y foam 28.0 6.5 / 2 GHz 0.95 3608.5 / 3 GHz

LCF 1 5/8’ CU2Y foam 49.7 4.4 / 2 GHz 1.7 3805.6 / 3 GHz


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2.10.44 Feeders (2)

Waveguides Used for frequency bands above 2.7 GHz Three basic types available: circular, elliptical and rectangular

Rigid circular waveguide Very low loss Supports two orthogonal polarisations Capable to carry more than one frequency band Usually, short components of this type are used Disadvantages: cost, handling and moding problems


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2.10.45 Feeders (3)

Elliptical semiflexible waveguides Acceptable loss, good VSWR performance Low cost and easy to install Various types optimised for many frequency bands up to 23 GHz Used for longer distances (easy and flexible installation) Can be installed as a "single run" (no intermediate flanges)

type loss /100 m FrequencyEW 34 2.0 4 GHzEW 52 4.0 6GHzEW 77 5.8 8GHzEW 90 10.0 11 GHzEW 220 28.0 23 GHz


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2.10.46 Feeders (4)

Solid and flexible rectangular waveguides Solid rectangular waveguides

Combination of low VSWR and low loss High cost and difficult to install Used for realising couplers, combiners, filters

type loss /100 m FrequencyWR 229 2.8 4 GHzWR159 4.5 6GHzWR112 8.5 8GHzWR 90 11.7 11 GHzWR 75 15.0 13 GHz


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2.10.47 Feeders (5)

Flexible rectangular waveguides Worse VSWR and losses than for solid waveguides Often used in short lengths (<1 m), where position between connection

points depends on actual installation place Common applications: connection of microwave system to antenna

(close together on rooftops or towers) for frequencies >13 Ghz

type loss / m FrequencyPDR140 0.5 15GHzPDR180 1 18 GHzPDR220 2 23 GHz


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2.10.48 Antenna feeder systems (1)

Direct radiating system Most commonly used for frequencies up

to 13 Ghz Depending on accepted feeder

loss/length, higher frequencies may be possible

Excessive attenuation and costs in long runs of wave guide

Occurence of echo distortion due to mismatch in long runs of waveguide possible


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Periscope antenna system Used for

• considerable antenna heights• waveguide installation problems

Negligible wave guide cost and easy installation

System gain is a function of antenna and reflector size, distance and frequency

Used above 4 GHz , because reflector size is prohibitive for lower frequencies


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Combined antenna with transceiver Antenna and transceiver are combined as a

single unit to cut out wave guide loss (higher frequencies)

Units are mounted on top of a mast and connected to multiplex equipment via cable


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2 Coverage Planning

2.11 Alcatel BSS


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2.11 Alcatel BSS

2.11.1 Architecture of BTS - Evolium Evolution A9100

3 levels

Antennacoupling level

TRX level

BCF level Station unit module

Abis interface

AbbreviationsBCF Base station Control FunctionTRX Transceiver

Antenna network stage ANc

Air interface

Combiner stage (ANy)Combiner stage (ANy)

TRXTRX TRXTRX TRXTRX TRXTRXTRXTRX TRXTRX TRXTRX TRXTRX TRXTRX TRXTRX TRXTRX TRXTRX

Antenna network stage ANc


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2.11 Alcatel BSS

2.11.2 EVOLIUMTM A9100 Base Station (1)

The Antenna network Combiner (ANc)- combining mode

DuplexerFilter Filter

LNA

Splitter

Splitter SplitterWBC


LNA

Splitter

SplitterSplitter WBC

Antenna ATXA, RXA, RXBdiv

Antenna BTXB, RXB, RXAdiv

TX RX RX div

TRX 1

TX RX RXdiv

TRX 2

Rxdiv RX TX

TRX 4

Rxdiv RX TX

TRX 3


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2.11 Alcatel BSS


The Antenna network Combiner (ANc)- bypass mode


LNA

Splitter

Splitter SplitterWBC


LNA

Splitter

SplitterSplitter WBC

Antenna ATXA, RXA, RXBdiv

Antenna BTXB, RXB, RXAdiv

TX RX RXdiv

TRX 1

Rxdiv RX TX

TRX 2

By-passfunction

By-passfunction


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2.11 Alcatel BSS


ANy: Twin Wide Band Combiner Stage

2 types of AnyFor GSM 900 and GSM 1800, two versions each are available:

Splitter SplitterWBC SplitterSplitter WBC

TXA RXA RXAdiv

TX RX RXdiv

TRX 1

TX RX RXdiv

TRX 2

Rxdiv RX TX

TRX 4

Rxdiv RX TX

TRX 3

RXBdiv RXB TXB

Band Variant Function

3BK 07237 AAxx Up to four standard TRX, up to two high-power TRXGSM 900

3BK 07237 ABxx Up to four standard TRX, up to four high-power TRX

3BK 07245 AAxx Up to four standard TRX, up to two high-power TRXGSM 1800

3BK 07245 ABxx Up to four standard TRX, up to four high-power TRX


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2.11 Alcatel BSS

2.11.5 EVOLIUMTM BTS Features (1)

Standard Features according to GSM• DR (Dual Rate), EFR (Enhanced Full Rate coder), AMR (Adaptive Multi Rate) requires

that the BSS software release and the other network elements also support these codecs

• HW supports GSM 850, E-GSM, GSM 900, GSM 1800 and GSM 1900 bands• Multi Band Capabilities (supporting of 850/1800 TRX, 850/1900TRX, and, 900

/1800 can be located in the same cabinet)• All known A5 algorithms to be supported; HW provisions done

Standard Features due to new Architecture and new SW Releases• SUS (Station Unit Sharing)

Only one central control unit (SUM) for all BTS per cabinet• Multiband BTS (GSM 900/1800) in one cabinet• Static (Release 4) and statistical (Release 6) submultiplexing on Abis

- Better use of Abis-interface capacity: More BTS/TRX to be supported in a multidrop loop

• Introduction of GPRS and HSCSD without HW changes• EDGE compatible TRX


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2.11 Alcatel BSS

2.11.6 EVOLIUMTM BTS Features (2)

Features specific to Radio Performance TX Output Power

RX Sensitivity: -111 dBm certified(GSM request: -104 dBm)

Synthesized Frequency Hopping as general solution• Standard RF hopping mode• Pseudo baseband RF hopping mode

Antenna Diversity in general• Two antennas per sector• One cross-polarized antenna

Duplexer (TX and RX on one antenna) as general solution


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2.11 Alcatel BSS

2.11.7 Generic Configurations for A9100 G4 BTS

The configurations for indoor (MBI) and outdoor (MBO) cabinet are presented in the next slides

larger configurations with more than one cabinet can be derived from the tables

configurations are valid for EDGE capable TRX (Evolution step 2) availability of multiband configurations other than GSM 900 / GSM

1800 must be checked with product management (authorization required)

Notation: BBU - Battery Backup Unit BATS - Small Battery Backup LBBU - Large Battery Backup Unit


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2.11 Alcatel BSS

2.11.8 Generic configurations for cabinets MBI (1)

R A CK

C O N F I G U R A T I O N T Y P E D C A C w /oB B U

A C w ithB A T S

A C w it hL B B U

G S M8 5 0

G S M9 0 0

G S M1 8 0 0

G S M1 9 0 0

S t a n d a r d c o n f ig u r a t io n sM B I 3 1 x 1 . . .4 X X ( 2 ) X X X

M B I 3 1 x 1 . . .8 X ( 2 ) X X ( 1 )

M B I 3 2 x 1 . . .2 X X ( 2 ) X X X

M B I 3 2 x 1 . . .4 X ( 2 ) X X ( 1 )

M B I 3 3 x 1 X X ( 2 ) X X X

M B I 3 3 x 1 . . .2 X ( 2 ) X X X

M B I 5 1 x 1 . . .8 X X X X X X X X

M B I 5 1 x 9 . . .1 2 X X X ( 2 ) X X ( 1 )

M B I 5 2 x 1 . . .4 X ( 2 ) X X X

M B I 5 2 x 1 . . .6 X X X X X X ( 1 )

M B I 5 1 x 1 .. .8 + 1 x 1 . . .4 X X X ( 2 ) X X

M B I 5 3 x 1 . . .2 X ( 2 ) X X X

M B I 5 3 x 1 . . .4 X X X X X X ( 1 )

M B I 5 4 x 1 … 3 X X X X ( 1 )

M B I 5 2 x 4 + 2 x 2 X X X X ( 1 )

( 1 ) R e s t r ic t io n s fo r G S M 1 9 0 0 :(1 ) U p to + 4 5 º C a m b ie n t t e m p e ra tu re p o s s ib le if m a x im u m 6 T R E s in M B I3 , 1 0 T R E s in

M B I5(2 ) L im ita t io n to + 4 0 º C o th e r w is e ( + 4 5 º C p o s s ib le if p o w e r is r e d u c e d to 2 8 W (P m a x – 2

d B ) )( 2 ) N o t in g e n e r ic l is t , b u t p o s s ib le ( c h e c k w i th S D o r p r o d u c t m a n a g e m e n t b e fo r e u s e )


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2.11 Alcatel BSS

2.11.9 Generic configurations for cabinets MBI (2)

RACK

CONFIGURATION TYPE DC AC w/oBBU

AC withBATS

AC withLBBU

GSM850

GSM900

GSM1800

GSM1900

Low Losses configurationsMBI3 1x3...4 X X X (2) X X X

MBI5 1x3...8 X X X X (2) X X X

MBI5 1x9...12 X X X (2) X X (1)

MBI5 2x3...6 X (2) X X (1)

High Power configurationsMBI3 2x1 X X X X X

MBI5 1x1...4 X X X X X



Extended Cells configurationsMBI5 1x1...4LL/1x1...4 X X X X X

MBI5 1x1...4/1x1...4 with TMA X X X X X

(1) Restrictions for GSM 1900:(1) Up to +45ºC ambient temperature possible if maximum 6 TREs in MBI3, 10 TREs in

MBI5(2) Limitation to +40ºC otherwise (+45ºC possible if power is reduced to 28W (Pmax –2

dB))(2) Not in generic list, but possible (check with SD or product management before use)


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2.11 Alcatel BSS

2.11.10 Generic configurations for cabinets MBO (1)

RACK


AC withBBU

GSM850

GSM900

GSM1800

GSM1900

Standard configurationsCBO 1x1…2 X (1) X (2) (1)

CBO 2x1 X (1) X (2) (1)

MBO1 1x1...6 X X

MBO1 1x1...8 X X X X

MBO1 2x1...3 X X


MBO1 3x1...2 X X X X X

MBO2 1x9...12 X X X X X


MBO2 1x1...8+1x1...4 X X X X X


MBO2 4x1…3 X X X X X

MBO2 2x4 + 2x2 X X X X X(1) CBO for GSM 850 and GSM 1900 are planned for 2004. For availability, check with SD or the

product management (authorization required).(2) CBO for GSM 1800 planned for Q4 2003 (check with SD)


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2.11 Alcatel BSS

2.11.11 Generic configurations for cabinets MBO (2)

RACK


AC withBBU

GSM850

GSM900

GSM1800

GSM1900

Low Losses configurationsMBO1 1x5...6 X X




High Power configurationsCBO 1x1…2 X X (2)

CBO 2x1 X X (2)

MBO1 1x1...4 X X X

MBO1 2x1...2 X X X

MBO1 3x1...2 X X X

MBO2 2x1…4 X X X

MBO2 3x1…4 X X X(1) CBO for GSM 850 and GSM 1900 are planned for 2004. For availability, check with SD or the

product management (authorization required).(2) CBO for GSM 1800 planned for Q4 2003 (check with SD)


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2.11 Alcatel BSS

2.11.12 TRX Types

This slide is referring only to Evolium macro BTS A9100 Overview on TRX types of A9100 Evolium Evolution BTS (G4)

M odule O utput pow ernam e G M SK 8PSK

Evolution Step 1TRG M G SM 900 35 W atts 45.44 dBmTRDM G SM 1800 35 W atts 45.44 dBmTRDH G SM 1800 60 W atts 47.78 dBm

Evolution Step 2TRAL G SM 850 45 W atts 46.53 dBm 15 W a tts 41.76 dBmTRAG G SM 900 45 W atts 46.53 dBm 15 W a tts 41.76 dBmTAG H G SM 900 60 W atts 47.78 dBm 25 W a tts 43.98 dBmTRAD G SM 1800 35 W atts 45.44 dBm 12 W a tts 40.79 dBmTADH G SM 1800 60 W atts 47.78 dBm 25 W a tts 43.98 dBmTRAP G SM 1900 45 W atts 46.53 dBm 25 W a tts 43.98 dBm

GMSK – Gaussian Minimum Shift Keying

8PSK – 8 phase shift keying


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2.11 Alcatel BSS

2.11.13 BTS Output Power

What is monitored during validation is the BTS output power at antenna connector

The individual losses for duplexer, combiner and internal cabling are not systematically measured

for detailed info consult the BTS product description


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2.11 Alcatel BSS

2.11.14 Feature Power Balancing

G4 BTS it is allowed to use TRXs of different power within the same sector, or to use of different combining path for TRX belonging to the same sector.

Reason: the G4 BTS is able to detect unbalanced losses/powers within a sector and automatically compensate it for GMSK modulation.

Consequence: All TRX connected to one ANc are automatically adjusted to the GMSK output power of the weakest TRX (required for BCCH recovery)


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2.11 Alcatel BSS

2.11.15 Cell Split Feature

Principle Cell Split allows to provide one logical cell with one common BCCH over

several BTS cabinets. The cabinets must be synchronized Benefits

Same number of TRX in fewer racks No need to touch/modify the configuration of existing BTS (cabling) Take full benefit of 12 TRX per cabinet

Drawback: more complex antenna system Applications

Multi-band cells Configuration extension of sites by adding TRX Large configurations

Condition: BTS must be synchronized


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2.11 Alcatel BSS

2.11.16 Influence of Cell Split feature on BTS configurations

One slave cabinet can only have one master One master can control three slave cabinets

Cabinet 1

4 TRXGSM 900

Master

4 TRXGSM 900

Master

Cabinet 2

4 TRXGSM 900

Master

4 TRXGSM 1800

Slave

4 TRXGSM 1800

Slave

4 TRXGSM 1800

Slave

Cabinet 3

4 TRXGSM 1800

Slave

4 TRXGSM 1800

Slave

4 TRXGSM 1800

Slave

Cabinet 1

6 TRXGSM 900Master

6 TRXGSM 1800

Master

Cabinet 2

6 TRXGSM 900Master

6 TRXGSM 1800

Master

Cabinet 4

2 TRXGSM 1800

Slave

2 TRXGSM 1800

Slave

Possible cell split configuration Not allowed cell split configuration


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2.11 Alcatel BSS

2.11.17 Cell Split Example: Deployment of multi-band cells

BTS 1 BTS 1 BTS 2

4TRX

4TRX

4TRX

4TRX

4TRX

4TRX

GSM 900 GSM 9002TRX

2TRX

2TRX

GSM1800

cell1

cell3

cell2

cell3

cell2

cell1

4TRX

4TRX

4TRX

GSM 900

4 TRX 9002TRX 1800

4 TRX 9002TRX 1800 4 TRX 900

2TRX 1800

BTS 1 BTS1 BTS 2

cell1

cell3

cell2

cell2

cell1

cell3

With cell split:- No antenna re-cabling- No TRX moving- Connection to the first BTS while the BTS is working- Short service interruption during radio conf. change

With cell split:- No antenna re-cabling- No TRX moving- Connection to the first BTS while the BTS is working- Short service interruption during radio conf. change

Without cell split:- Complete re-configuration

Without cell split:- Complete re-configuration


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2.11 Alcatel BSS

2.11.18 Cell Split Example: Migration to multiband cells

Example: Migration from multiband BSS (single BCCH) to multiband cells (dual BCCH)

No more limitation to have the 900 and the 1800 TRX‘s installed inside the same cabinet

4TRX

4TRX

4TRX

GSM 900

4TRX

4TRX

4TRX

GSM1800

BTS 1 BTS 2

Cell 3

Cell 2

Cell 1

4TRX

4TRX

4TRX

GSM 900

BTS 1

Cell 1

Cell 3

Cell 2

4TRX

4TRX

4TRX

GSM 1800

BTS 2

Cell 4

Cell 6

Cell 5


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2.11 Alcatel BSS

2.11.19 Cell Split Example: High Power Configuration

For a MBI5, in a 3 sector configuration, max. 3 HP TRX /sector are allowed (thermal reasons).

The only way´to have 3x6 in MBI5 is with the cell split feature.


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BTS 1 (with900 or 1800TRX)

4TRX

4TRX

4TRX

BTS 1 (with 12 TRX900 or 1800)BTS 2 (with 6 TRX

900 or 1800)

4TRX

4TRX

4TRX

LinkedBTS

2 TRX

4TRX

cell1

cell2

cell3 cell3

cell2

cell1

Two shared sectors

2.11 Alcatel BSS

2.11.20 Cell Split Example: Configuration extension

3x4 sector cells extended to cell 1(6 TRX), cell 2 (4 TRX), cell 3 (8 TRX)


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3x8 TRX with 2 racks:

16 TRX’s per cell

4TRX

4TRX

4TRX 4TRX

4TRX

4TRX

BCCH

BTS 1 BTS 2 Without cell split: -3 racks with 8 TRX/sector, empty space

With cell split: -2 racks with 12 TRX, 8 TRX per sector

Without cell split: -3 racks with 8 TRX/sector, empty space

With cell split: -2 racks with 12 TRX, 8 TRX per sector

2.11 Alcatel BSS

2.11.21 Cell Split Example: Large configurations


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2.11 Alcatel BSS

2.11.22 Indoor BTS Rack Layout

IND mini: 4carrier, 1 Duplexer (Anx), 1 Combiner (Any), SUM (CPU, Link to BSC)

IND Medi: 12carrier, 3 Duplexer (Anx), 3 Combiner (Any), SUM (CPU, Link to BSC)


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2.11 Alcatel BSS

2.11.23 Outdoor BTS Rack Layout


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2.11 Alcatel BSS

2.11.24 3 Level Architecture


13

14

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2.11 Alcatel BSS

2.11.25 Micro BTS types

EVOLIUM A910 Micro Base Station (internal reference M4M)

still operational in a large number

is being out phased

up to 6 TRX-es

M5M EVOLIUM A9110 Micro-BTS (M5M)

Introduced in Q3 2003

up to 12 TRX-es

site configurations can mix older A910 with newer A9110-E

support for GPRS and EDGE (release dependent)


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2.11 Alcatel BSS

2.11.26 Technical Data

A910(2 TRX)

A9110(2 TRX)

Frequency band GSM 850, E-GSM,GSM900, GSM 1800, GSM

1900

GSM 850, E-GSM,GSM900, GSM 1800, GSM

1900Tx output power(at antenna connector)

Up to 4.5 W 7 W

Rx sensitivity -107 dBm -110 dBm

Radio FH Yes yes

Temperature range (max.) 55 °C 55 °C

Max. power consumption 130 W 145 W

Size (volume) 54 litres 54 litres

Weight 39.6 kg (incl. connectionbox)

32.5


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2.11 Alcatel BSS

2.11.27 Evolium™ BSC Characteristics

Capacity Maximum physical capacity: 352 FR TRX or 176 DR TRX in 255 BTS Traffic and signalling capacity: up to 1500 erlang->∅13,5 erl/BTS traffic capacity

Flexibility 6 Abis interfaces per SM module with integrated cross connect function Integrated in BSC subracks (no cabling), 100% Alcatel No BSC internal recabling for network extensions/modifications

Compactness Maximum BSC configuration in three standard Alcatel 1000 S12 cabinets (90 cm width,

52 cm depth)

Technology Two stage Alcatel 1000 S12 switching technology Distributed processing in trunk control units and processing resources Same application SW running on both BSC generations


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2.11 Alcatel BSS

2.11.28 BSC Architecture

BIUA

TCUC

TCUC

TCUC

TCUC

TCUC

TCUC

TCUC

TCUC

AS

DTCC

DTCC

DTCC

DTCC

DTCC

DTCC

DTCC

AS

DTCC

CPRC CPRC CPRC CPRC CPRC CPRC CPRC CPRC

AS

6 xG.703AbisI/F

2 xG.703AtermuxedI/F

Abis TSU Ater TSU

Common Functions TSU

Group Switch8 Planes2 Stages

TSCA

TSL

ASMB

ASMB

Q1 bus

Broadcast bus

self-routing, non-blocking


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2.11 Alcatel BSS

2.11.29 BSC Rack Layouts

A-BIS TSU

AIRBAFFLE

A-BIS TSUGS

GSCOMMON TSUTSCA

ClockStage 1

Stage 2Stage 2 Stage 2

A-BIS TSU

Group Switch GS GS

A-TER TSU

A-TER TSU A-TER TSU

A-BIS TSU

Stage 2

A-BIS TSU

AIRBAFFLE

A-BIS TSUGS

GSA-BIS TSUTSCA

ClockStage 1

Stage 2Stage 2 Stage 2

A-BIS TSU

Group Switch GS GS

A-TER TSU

A-TER TSU A-TER TSU

A-BIS TSU

Stage 2

A-BIS TSU

AIRBAFFLE

A-BIS TSUGS

A-BIS TSUTSCA

ClockStage 1

A-BIS TSU

A-TER TSU

A-TER TSU A-TER TSU

A-BIS TSU

6 Configurations possible

Cabinet #1 Cabinet #2 Cabinet #3


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2 Coverage Planning

2.12 Coveradge Improvement


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2.12 Coveradge Improvement

2.12.1 Antenna Diversity


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2.12.1.1 Diversity

Purpose Improvement in fading probability

statistics leads to a better total signal level or

better total S/N ratio

Principle Combining signals with same

information from different signal branches

Demands correlation between different signal

branches should be low

Combining methods Selection Diversity Maximum Ratio Combining Equal Gain Combining

Purpose

The purpose of using diversity is to reduce short-term fading effects, such that an acceptable level of performance (receiver sensitivity) can be achieved, without having to increase the transmitted power or the bandwidth.

Principle

The principle relies on the combination of two or more signals, containing the same information, which are at least partially de-correlated. If two signals of the same level are completely de-correlated, the probability that both signals experience the same depth of fade is very low. Therefore the signal reliability is increased.


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Time [sec]

Field

stre

ng

th[d

Bm

]

0.1 0.2 0.3 0.4

-80

-90

-100

Antenna 1 Antenna 2


2.12.1.2 Selection Diversity (1)

Principle selection of the highest baseband

signal-to-noise ratio (S/N) or of the strongest signal (S+N)

Correlation of signal levels a lower correlation between signal

levels of different branches improves the total signal level

Correlation of signal levels should be low

The algorithm for the selective diversity combining technique is based on the principle of selecting the best signal among all of the signals received from different branches, at the receiving end.


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Time [sec]

Field

stre

ng

th[d

Bm

]

0.1 0.2 0.3 0.4

-80

-90

-100

Antenna 1

Antenna 2



Difference in signal level a high difference in signal levels of two

branches doesn’t improve the total signal level

Difference in signal levels should be low


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Theoretical diversity gain 10dB for two-branch diversity at the

99% reliability level 16dB for four branches at the 99%

reliability level

The theoretical diversity gain doesn’t improve linear with the number of branches


In comparison with MRC, in this technique the branch weights are all set to unity but the signal from each branch are co-phased to provide equal gain combining diversity.

The possibility of producing an acceptable signal from a number of unacceptable inputs is still retained, and performance is only marginally inferior to maximal ratio combining an superior to selection diversity.

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2.12.1.5 Equal Gain Combining (1)

Principle cophase signal branches sum up signals

Coherent addition of signals and incoherent addition of noises Theoretical diversity gain

11dB for two-branch diversity at the 99% reliability level


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2.12.1.6 Equal Gain Combining (2)

Difference in signal level Assuming equal noise in the branches,

the higher the difference in signal levels is, the higher is the loss of S/N ratio of the better signal branch after summation



levels of different branches improves the total S/N ratio



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2.12.1.7 Maximum Ratio Combining (1)

Principle weight signals proportionally to their

S/N ratios cophase signal branches sum up the weighted signals

Coherent addition of signals and incoherent addition of noises Improved S/N

In this method the signals from all the branches are weighted according to their individual S/N and then summed. Here the individual signals must be co-phased before being summed ( unlike selection diversity ) which generally requires an individual receiver and phasing circuit for each antenna .

Maximal ratio combining produces an output SNR equal to the sum of the individual SNRs. Thus, it has the advantage of producing an output with an acceptable SNR even when none of the individual signals are themselves acceptable.

This technique gives the best statistical reduction of fading of any known diversity combiner. Modern DSPs and digital receivers are now making this optimal form of diversity practical.


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levels of different branches improves the total S/N ratio



2.12.1.8 Maximum Ratio Combining (2)

Difference in signal level Assuming equal noise in the branches,

the higher the difference in signal levels is, the higher is the loss of S/N ratio of the better signal branch after summation

comparing to equal ratio combining, this combining reduces influence of worse signal branches



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2.12.1.9 Comparison of combining methods

Improvement of average SNR from a diversity combiner compared to one branch

(a) Maximum Ratio Combining (b) Equal Gain Combining (c) Selection Diversity

The maximum ratio combining, which is used in the ALCATEL BTS, gives the best statistical reduction of any known linear diversity combiner.


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2.12.1.10 Enhanced Diversity Combining (1)

Principle: 2 algorithms

• Beam forming algorithm (available also for MRC)• Interference reduction algorithm (new)

best efficiency when the useful signal and the interfering signals come from different directions.

Requirements to benefit from this feature: Hardware: G4 TRE (Edge capable TRX) installed in Evolium Evolution BTS

step1 resp. step 2 (internal name: G3 resp. G4) Software release: from B6.2 onwards For a maximum gain: antenna engineering rules respected

• Correct antenna choice for the considered environment• Correct antenna spacings and orientations (in case of space diversity)

Beam forming algorithm (available also for MRC):

improves the received signal by steering a beam into the direction of the mobile; it estimates the phase difference between the two antennas, corrects this phase difference, weightens the signals in proportion to their signal to noise ratio before the co-phased signals are added; there is coherent addition of the signals and incoherent addition of the noises; this increases the signal to noise ratio

Interference reduction algorithm (new)

it cancels interferers by steering a null into their directions (it estimates the phase difference between the two antennas for the interfering signals and then, it rejects these interfering signals by adding the signals with an inversed phase).


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2.12.1.11 Enhanced Diversity Combining (2)

The values in the right column are due to the feature Enhanced Diversity Combining, Selective Beam-forming Combining

Antenna d iversity gain recom mendation for link budgetEnvironm ent Evolu tion

step 1,Evolu tionstep 2 up

to B5

Evolutionstep2sinceB6.2

Urban, dense urban 5 dB 6 dBResidentia l, suburban 3.5 dB 5 dBRural (horizontal space diversity) 3 dB 3.5 dB


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2.12.1.12 Diversity systems in Mobile Radio Networks

Two diversity systems are used in Mobile Radio Networks :

Space DiversitySpace Diversity• horizontal• vertical

Polarization DiversityPolarization Diversity

dH

RXA RXB

+45° -45°

RXA RXB


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2.12.1.13 Space Diversity Systems

Diversity gain depends on spatial separation of antennas

dH

RXA RXB

dV

RXA

RXB

Horizontal separation(e.g. Roof Top)

Vertical separation(e.g. Mast)

For Optimum Diversity GaindH = 20λ dV =

15λGSM900 = 6m GSM900 = 4.5mGSM1800 = 3m GSM1800 = 2.25m


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The larger the separation the higher the diversity gain Prefer horizontal separation (more effective) The higher the antenna the higher the required

separation, rule: d > h/10 Highest diversity gain from the "broadside” Select orientation of diversity setup according to orientation of cell /

traffic

h

d

Optimum diversity Gain


2.12.1.14 Space Diversity - General Rules


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2.12.1.15 Achievable Diversity Gain

Depends on fading conditions Varies in between 2.5 - 6dB Higher diversity gain in areas with multipath propagation (urban and

suburban areas)

General rule: consider diversity gain with 3dB in the link budget


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Horizontal / vertical polarization:Hor/Ver Antenna

Polarization of +/- 45°:cross polarized antennaor Slant antenna

Big Advantage: Only one panel antenna is required to profit from diversity gain using this configuration

V H +45° -45°

RXA RXB RXA RXB


2.12.1.16 Polarization Diversity

Diversity gain in using orthogonal orientated antennas


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DiversityGain

multipath-propagation

reflection,diffraction

reception with

reception with

a hor / verpolarisedantenna

a X-polarisedantenna

EV

EH

EX2

EX1

G = f( ρ,∆ )

Time [sec]

Ex1 or Ev

Ex2 or Eh


2.12.1.17 Principle of Polarization Diversity

ρ correlation coeficient (0.7)

∆ difference in signal level

---> diversity gain with dual polarized antennas depends on :

ρ, ∆ and the orientation of the sending and receiving antenna

To achieve low correlation and low differences in signal level, reflection and diffraction under multipath condition is necessary. ---->

In rural areas neglectible diversity gain can be expected from polarization diversity.


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2.12.1.18 Air Combining

Features only one TX per antenna combining signals "on air" and not in a

combiner 3dB combiner loss can be saved to

increase coverage

Can be realized with two vertical polarized antennas one cross polarized panel antennaTX1 TX2

TX1 TX2

The idea of air combining is to combine transmitted signals in the air and not with an internal combiner, in order to save combining losses. Thus the maximum achievable coverage range will be increased.Air combining can be realized with• two sector or omni antennas• one cross polar antenna transmitting different carriers on +/-45°.


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2.12.1.19 Air Combining with Polarization Diversity

One antenna system cross polarized antennas

recommended for urban/suburban area (less space req.)

No Air combiningBandfilter if De-coupling too low

Air combiningRecommended forEvolium BTS

V H

DUPL BF

TX RXA RXB

DUPL

TX1 RX1 TX2 RX2RX2D RX1D

DUPL

or

1 TRX 2 TRX


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2.12.1.20 Air Combining with Space Diversity

Two antenna system Vertical or horizontal spacing

(recommended for rural area)

RXA RXB TX

or or

RXARXB

TX


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2.12.1.21 Decoupling of Signal Branches

One antenna system: TX / RX decoupling cannot be achieved by spatial separation

Decoupling between both polarization branches needs to be sufficiently high to avoid blocking problems intermodulation problems

Required decoupling values G2 BTS: 30 dB Evolium A9100 BTS: 25dB (Integrated duplexer Anx)


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2.12.1.22 Cross Polarized or Hor/Ver Antenna? (1)

Receiving Application same diversity gain for cross polarized and hor/ver antennas in urban and suburban area polarization diversity gainpolarization diversity gain equal to space space

diversity gaindiversity gain (2.5 - 6dB) negligible polarization diversity gain polarization diversity gain in rural areas (not recommended) accordingly consider polarization diversity gainpolarization diversity gain with 3dB in the link budget


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2.12.1.23 Cross Polarized or Hor/Ver Antenna? (2)

Transmission Application: Air combining

3dB loss when transmitting horizontal/vertical polarized (use of combiner)

1-2dB losses when transmitting at 45°(optimum antenna is straighten vertically)

Air combining only recommended with cross polarized antenna

3dB2dB


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2.12.1.24 Conclusion on Antenna Diversity

Rural Areas installation space not limited apply Space Diversity (higher gain)

Urban and Suburban Area apply space or polarization diversity use cross polarized antennas for air combining

Diversity Gain consider diversity gain in link budget with 3dB


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2.12. Coveradge Improvement

2.12.2 Repeater Systems


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2.12.2.1 Repeater Application

BTS (donor cell)repeater

original service areaarea covered by repeater


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2.12.2.2 Repeater Block Diagram

Required Isolation > 70…90 dB

A repeater is a bi-directional amplifier. It receives the downlink signal from the BTS, amplifies it and transmits the signal to the mobile. In the uplink direction, the signal of the mobile is received, amplified and transmitted to the BTS.


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2.12.2.3 Repeater Applications (2)

Coverage Improvement of Cells (‘Cell Enhancer’) removal of coverage holes caused by

• topography (hills, ravines, ...)• man made obstacles

Provision of tunnel coverage street, railway tunnels underground stations

Provision of indoor coverage at places of low additional traffic


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2.12.2.4 Repeater Types

Channel selective repeaters high selectivity of certain channels high traffic areas, small cell sizes

Band selective repeaters adjustment to operator’s frequency

band no (accidental) usage by competitors

Broad band repeaters low cost solution for low traffic areas

(rural environment) medium to high repeater gain

Personal repeaters low gain broad band indoor coverage improvement for

certain rooms


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Antennatodonor cell

Repeater

Radiatingcable

Tunnel


2.12.2.5 Repeater for Tunnel Coverage

Choice of repeater type due to tunnel dimensions wall materials

feeding by directional antennas leaky feeder cables

long tunnels chains of several repeaters fiber optic backbone for repeater

feeding


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Personal repeater

Antennatodonor cell

Fiber opticdistribution

Remoteunits

Master unit

Radiatingcable


2.12.2.6 Repeater for Indoor coverage

For smaller buildings Compensation for wall losses, window

losses (heat insulated windows) Low cost personal repeaters installed in

certain rooms

For larger buildings (shopping malls, convention centers, sport centers)

multispot transmission using• co-axial distribution network• fiber-optic distribution network


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2.12.2.7 Planning Aspects

Repeater does not provide additional traffic capacity risk of blocking if additional coverage area catches more traffic possible carrier upgrading required

Repeater causes additional signal delay delay: 4..8µs max. cell range of 35 km reduced by 1 to 2km special care needed for total delay of repeater chain! delayed signal and original signal could cause outage in urban environment if

total delay exceeds 16 ... 22µs


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2.12.2.8 Repeater Gain Limitation (1)

Intermodulation products should be low when amplifier reaches saturation point, intermodulation products go up

Signal to noise ratio should be high when amplifier reaches saturation point, signal to noise ratio is getting worse

Antenna isolation between transmission and receiving antenna should be high if signal feedback from transmission antenna to receiving antenna is too high,

amplifier goes into saturation


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2.12.2.9 Repeater Gain Limitation (2)

Pin Poutgain78 dB

isolation90 dB

Pback =Pin - 12 dB

Repeater gain limited by antenna isolation:

GRepeater < IDonor, Repeater - M M (Margin) ~ 12 dB

Measure isolation after installation

inMAmplifierGI argδ+=


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2.12.2.10 Intermodulation Products

A Non-linear system produces higher-order intermodulation

products as soon as output power reaches the saturation point

Parameter 1 dB compression point 3rd order intercept point (ICP3) Intermodulation reduction (IMR) Amplifier back-off

GSM900/GSM1800 requirements IM products ≤ -36 dBm or IM distance > 70 dBc whichever is higher

Each amplifier has a limited linear operation range.

In the linear range the input power is amplified by the amplification factor v. But this is only valid until a certain maximum input power. As soon as you feed the amplifier with too high input power the input signal will less and less amplified. The point were the degradation from the specified amplification is 1dB is called the one dB compression point.

Lower amplification is one effect when you operate an amplifier in the non linear region, another effect which can cause even worse problems is the intermodulation. Especially the 3rd order intermodulation product (2f1+-f2) is very significant. The amplifier produces interfering signals based on available frequencies (f1 and f2).

dbc = is the power of one signal referenced to a carrier signal


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Uplink Loss = Downlink Loss ⇒ Uplink Gain = Downlink Gain!


2.12.2.11 Repeater Link Budget

Different gains may be needed in Up- and Downlink if the sensitivity of the repeater is worse than the sensitivity of the BTS

!

Downlink Path Unit ValueReceived power at repeater dBm -65Link antenna gain dBi +19Cable loss dB -2Repeater input power dBm -48Repeater gain dB +78Repeater output power dBm 30Cable loss dB -2Repeater antenna gain dBi +18EIRP dBm 46


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2.12.2.12 High Power TRXs

High Power TRXs: solution for coverage improvement HP must be used together with TMA: due to unbalanced Link Budget A9100 BTS supports

High Power TRX Medium Power TRX type is chosen by:

• environment conditions • required data throughput (GPRS/EDGE)

TX power of EVOLIUM™ Evolution step 2 TRX :Frequency band TX output power, GMSK TX output power, 8-PSK (EDGE)GSM 900 HP 60 W = 47.8 dBm 25 W = 44.0 dBmGSM 1800 HP 60 W = 47.8 dBm 25 W = 44.0 dBm


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2.12.2.13 3x6 TRXs High Power Configuration

Configuration made with EVOLIUM™ A9100 Base Station Obs:

All TRX are HP The configuration is using cell split feature

Cabinet1(High power 3x3TRX)

Sector3: 1x6 TRXSector2: 1x6 TRXSector1: 1x6 TRX

Cabinet2(High power 3x3TRX)

No-com-bining

ANc

HPTRX1 HPTRX 2

Combi-ning

MPTRX 3

No-com-bining

ANc

HPTRX1 HPTRX 2

Combi-ning

MPTRX 3

No-com-bining

ANc

HPTRX1 HPTRX 2

Combi-ning

MPTRX 3

No-com-bining

ANc

HPTRX1 HPTRX 2

Combi-ning

MPTRX 3

No-com-bining

ANc

HPTRX1 HPTRX 2

Combi-ning

MPTRX 3

No-com-bining

ANc

HPTRX1 HPTRX 2

Combi-ning

MPTRX 3


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2.12.2.14 Mixed TRX Configuration

BTS EVOLIUM™ supports a mix of: EVOLIUM™ TRX (TRE) - supports GSM/GPRS and EDGE EVOLIUM™ Evolution step 2 TRX (TRA) with Medium Power EVOLIUM™ Evolution step 2 TRX (TRA) with High Power

TRE

TRE

TRA

MP

TRA

HP

Hardware configuration

Logical cell

TRX1 (BCCH)

TRX2 (1 SDCCH)

TRX3

TRX4

Packet VoiceAllocation


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3 Traffic & Frequency Planning


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3 Fraffic & Frequency Planning

3.1 Traffic Caspacity


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3.1 Traffic Capacity

3.1.1 Telephone System

subscriber

1

2

3

4

line to PSTN

sub 1

sub 2

sub 3

sub 4

timeobservation period, e.g.main busy hour (MBH)

blocked callattempts

Parameters:

λ: arrival rate [1/h]µ: release rate [1/h]1/µ: mean holding time [sec]

"offered" traffic = # of calls arriving in MBH × mean holding time ρ = λ × 1/µ [Erlang]

automaticswitch


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3.1.2 Offered Traffic and Traffic Capacity

Handled Traffic, Traffic Capacity: TBlocking Probability, Grade of Service (GoS): pblock = R / ρSystem load: τ = T / n, i.e. T < n

Loss System(n slots)

HandledTraffic (T)

OfferedTraffic (ρ)

Rejected Traffic (R)

T = ρ - R


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3.1.3 Definition of Erlang

ERLANG : Unit used to quantify traffic

T = (resource usage duration)/(total observation duration) [ERLANG]


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3.1.4 Call Mix and Erlang Calculation

CALL MIX EXAMPLE• 350 call/hour• 3 LU/call• TCH duration : 85 sec• SDCCH duration : 4,5 sec

ERLANG COMPUTATION• TCH = (350 * 85)/3600 = 8,26 ERLANG• SDCCH = [ (350 + 350*3) * 4,5 ] / 3600 = 1.75 ERLANG


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3.1.5 ERLANG B LAW

ERLANG B LAW

Relationship between

• Offered traffic• Number of resources• Blocking rate


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3.1.5 ERLANG B LAW (2)

call request arrival rate (and leaving) is not stable number of resources = average number of requests mean

duration is sometime not sufficent => probability of blocking

=> Erlang B law Pblock : blocking probability N : number of resources E : offered traffic [Erlang]

Calculated with Excel - Makro or Table


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3.1.6 Erlang´s Formula

How to calculate the traffic capacity T? Basics: Markov Chain (queue statistics)

Calculation of the blocking probability using Erlang´s formula (Erlang B statistics):

Varation of ρ until pblock reached: ρ → T

pn iblock

n i

i

n= ∑

=

ρ ρ! !0

p0 p1

2µµ

λ

pi

λ

pnnµ

p2

3µ

no callestablishe

d

i channels occupied

all channels occupied


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3.1.7 Blocking Probability (Erlang B)

Nr. of Blocking Probability Erlang Bchannels 0.1% 0.2% 0.5% 1% 2% 3% 4% 5% 10% 15% 20% 50%

1 0.001 0.002 0.005 0.010 0.020 0.031 0.042 0.053 0.111 0.176 0.250 1.0002 0.046 0.065 0.105 0.153 0.223 0.282 0.333 0.381 0.595 0.796 1.000 2.7323 0.194 0.249 0.349 0.455 0.602 0.715 0.812 0.899 1.271 1.602 1.930 4.5914 0.439 0.535 0.701 0.869 1.092 1.259 1.399 1.525 2.045 2.501 2.945 6.5015 0.762 0.900 1.132 1.361 1.657 1.875 2.057 2.218 2.881 3.454 4.010 8.4376 1.146 1.325 1.622 1.909 2.276 2.543 2.765 2.960 3.758 4.445 5.109 10.3897 1.579 1.798 2.157 2.501 2.935 3.250 3.509 3.738 4.666 5.461 6.230 12.3518 2.051 2.311 2.730 3.128 3.627 3.987 4.283 4.543 5.597 6.498 7.369 14.3209 2.557 2.855 3.333 3.783 4.345 4.748 5.080 5.370 6.546 7.551 8.522 16.294

10 3.092 3.427 3.961 4.461 5.084 5.529 5.895 6.216 7.511 8.616 9.685 18.27311 3.651 4.022 4.610 5.160 5.842 6.328 6.727 7.076 8.487 9.691 10.857 20.25412 4.231 4.637 5.279 5.876 6.615 7.141 7.573 7.950 9.474 10.776 12.036 22.23813 4.831 5.270 5.964 6.607 7.402 7.967 8.430 8.835 10.470 11.867 13.222 24.22414 5.446 5.919 6.663 7.352 8.200 8.803 9.298 9.730 11.473 12.965 14.413 26.21215 6.077 6.582 7.376 8.108 9.010 9.650 10.174 10.633 12.484 14.068 15.608 28.20116 6.721 7.258 8.099 8.875 9.828 10.505 11.059 11.544 13.500 15.176 16.807 30.19117 7.378 7.946 8.834 9.652 10.656 11.368 11.952 12.461 14.522 16.289 18.010 32.18218 8.046 8.644 9.578 10.437 11.491 12.238 12.850 13.385 15.548 17.405 19.216 34.17319 8.724 9.351 10.331 11.230 12.333 13.115 13.755 14.315 16.579 18.525 20.424 36.16620 9.411 10.068 11.092 12.031 13.182 13.997 14.665 15.249 17.613 19.647 21.635 38.15921 10.108 10.793 11.860 12.838 14.036 14.885 15.581 16.189 18.651 20.773 22.848 40.15322 10.812 11.525 12.635 13.651 14.896 15.778 16.500 17.132 19.692 21.901 24.064 42.14723 11.524 12.265 13.416 14.470 15.761 16.675 17.425 18.080 20.737 23.031 25.281 44.14224 12.243 13.011 14.204 15.295 16.631 17.577 18.353 19.031 21.784 24.164 26.499 46.13725 12.969 13.763 14.997 16.125 17.505 18.483 19.284 19.985 22.833 25.298 27.720 48.13230 16.684 17.606 19.034 20.337 21.932 23.062 23.990 24.802 28.113 30.995 33.840 58.11335 20.517 21.559 23.169 24.638 26.435 27.711 28.758 29.677 33.434 36.723 39.985 68.09940 24.444 25.599 27.382 29.007 30.997 32.412 33.575 34.596 38.787 42.475 46.147 78.08845 28.447 29.708 31.656 33.432 35.607 37.155 38.430 39.550 44.165 48.245 52.322 88.07950 32.512 33.876 35.982 37.901 40.255 41.933 43.316 44.533 49.562 54.029 58.508 98.072


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3.1.8 BTS Traffic Capacity (Full Rate)

Number of Speech Traffic (Erlang B) Signalling Traffic (Erlang B)TRX SDCCH TCH 1% 2% 5% 0.1% 0.2% 0.5%1 4 7 2.501 2.935 3.738 0.439 0.535 0.7012 8 14 7.352 8.2 9.73 2.051 2.311 2.733 8 22 13.651 14.896 17.132 2.051 2.311 2.734 16 29 19.487 21.039 23.833 6.721 7.258 8.0995 16 37 26.379 28.254 31.64 6.721 7.258 8.0996 24 44 32.543 34.682 38.557 12.243 13.011 14.2047 24 52 39.7 42.124 46.533 12.243 13.011 14.2048 32 59 46.039 48.7 53.559 18.205 19.176 20.678


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3.2 Network Evolution


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3.2.1 Network Evolution - Capacity Approach (1)

The roll out of a network is dedicated to provide coverage

Network design changes rapidly

Planning method must be flexible and fast (group method)

Manual frequency planning possible


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With the growing amount of subscribers, the need for more installed capacity is rising

Possible Solutions:

Installing more TRXs on the existing BTS

Implementing additional sites

Discussion!

Also new services like GPRS are demanding more capacity


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Installing more TRXs - Advantages No site search/acquisition process No additional sites to rent (saves cost) Trunking efficiency Higher capacity per cell

Installing more TRXs - Disadvantages More antennas on roof top (Air combining) Additional losses if WBC has to be used

• Less (indoor) coverage

More frequencies per site needed Tighter reuse necessary decreasing quality

Trunking efficiency

1TRX 2.9 Erl. +2.9 Erl

2TRX 8.2 Erl +5.3 Erl (+1 Signalling TS)

3TRX 14.9 Erl +6.7 Erl





….


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Implementing additional sites - Advantages Reuse can remain the same (smaller cell sizes) Needs less frequency spectrum

• higher spectrum efficiency

Implementing additional sites - Disadvantages Additional site cost (rent) Re-design of old cells necessary (often not done)


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3.3 Cell Structures


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3.3 Cell Structures

3.3.1 Cell Structures and Quality

Frequency re-use in cellular radio networks allow efficient usage of the frequency spectrum but causes interference

Interdependence of Cell size Cluster size Re-use distance Interference level Network Quality

interfererregion


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3.3 Cell Structures

3.3.2 Cell Re-use Cluster (Omni Sites) (1)

1

2 3

47

6 5 1

2 3

47

6 5RD


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3.3 Cell Structures

3.3.2 Cell Re-use Cluster (Omni Sites)(2)

5 64

1 2 3

7 8 9

10 11 12

D


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3.3 Cell Structures

3.3.4 Cell Re-use Cluster (Sector Site) (1)


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3.3 Cell Structures

3.3.5 4x3 Cell Re-use Cluster (Sector Site) (2)


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3.3 Cell Structures

3.3.6 Irregular (Real) Cell Shapes

12 3

4

56

5

7Network Border

CoverageHole Island


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3.4 Frequency Reuse


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3.4 Frequency Reuse

3.4.1 GSM Frequency Spectrum

GSM 900 DL: 935-960 MHz UL: 890-915 MHz 200 kHz channel spacing 124 channels ARFCN 1 - 124

E-GSM DL: 925-935 MHz UL: 880-890 MHz 200 kHz channel spacing Additional 50 channels ARFCN 0, 975 - 1023 200 kHz channel spacing 124 channels

GSM 850 DL: 869-894 MHz UL: 824-849 MHz ARFCN: 128 - 251

GSM 1800 DL: 1805-1880 MHz UL: 1710-1785 MHz 200 kHz channel spacing 374 channels ARFCN 512 - 885


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3.4 Frequency Reuse

3.4.2 Impact of limited Frequency Spectrum

Bandwidth is an expensive resource

Best usage necessary

Efficient planning necessary to contain good QoS when the traffic in

the network is increasing smaller reuse Multiple reuse pattern (MRP) usage implementation of concentric cells / microcells/dual band implementation of Frequency Hopping

• Baseband• Synthezised


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3.4 Frequency Reuse

3.4.3 What is frequency reuse?

As the GSM spectrum is limited, frequencies have to be reused to provide enough capacity

The more often a frequency is reused within a certain amount of cells, the smaller the frequency reuse

Aim:Minimizing the frequency reuse for providing more capacity

REUSE CLUSTER:Area including cells which do not reuse the same frequency (or frequency group)


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3.4 Frequency Reuse

3.4.4 RCS and ARCS (1)

Reuse Cluster Size - RCS If all cells within the reuse cluster have the same amount of TRXs, the reuse per

TRX layer can be calculated:

cellTRXBRCS

/#=

cellTRXBARCS

/#=

Average Reuse Cluster Size - ARCS If the cells are different equiped, the average number of TRXs has to be

used for calculating the average reuse cluster size:


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3.4 Frequency Reuse

3.4.5 RCS and ARCS (2)

The ARCS is giving the average reuse of the network when using the whole bandwidth and all TRXs per cell

E.g: if we want to have the reuse of all non hopping TCH TRXs, we have to use the dedicated bandwidth and the average number of non hopping TCH TRXs per cell to get the ARCS of this layer type.

Each cell has only one BCCH. Therefore the BCCH reuse is an RCS and not an ARCS!


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3.4 Frequency Reuse

3.4.6 Reuse Cluster Size (1)

Sectorized sites 4 sites per reuse cluster 3 cells per site

REUSE Cluster Size:4X3 =12

1 2

3

4 5

6

7 8

9

10 11

12

1 2

3

4 5

6

7 8

9

10 11

12


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3.4 Frequency Reuse

3.4.7 Reuse Cluster Size (2)

Sectorized sites 3 sites per reuse cluster 3 cells per site

REUSE Cluster Size3X3 = 9

1 2

3

4 5

6

7 8

9

1 2

3

4 5

6

7 8

9


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3.4 Frequency Reuse

3.4.8 Reuse Distance

RCSRfD ⋅⋅⋅= 3

= cells sectorized-three32

cells ionalomnidirect1f

re-use distancecell A

cell B

interfererregion

In theory reuse distance and reuse shouldn’t be dependent.

In reality, when the cells are not well designed: bigger cell overlapp =>higher frequency reuse, smaller reuse distance


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3.4 Frequency Reuse

3.4.9 Frequency Reuse Distance

site A site B

distance DR

D = distance between cell sites with the same frequenciesR = service radius of a cellB = number of frequencies in total bandwidthRCS = reuse cluster size, i.e. one cell uses B/RCS frequencies

In hexagonal cell geometry: D/R = f · 3 RCS

omni cells: f=1; sector cells: f=2/3

Examples (omni):RCS = 7: D/R = 4.6RCS = 9: D/R = 5.2RCS =12: D/R = 6.0

Received Power

Frec

σC/I

Frec, A Frec, B

0


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3.4 Frequency Reuse

3.4.10 Frequency Reuse: Example

No sectorization 7 cells per cluster

BCCH RCS = 7 TCH Reuse: Depending on BW

and Number of installed TRXs per cell

Example: B= 26 4TRXs per cell

interfererregion

63

1726 =−−= GuardBCCHRCSTCH

RCSTCH

RCSBCCH

BCCH reuse is always RCS, because we don’t need to use an average (always one BCCH per cell).

Omni cells

To calculate the TCH reuse in the example, the BCCH RCS is subtracted from the bandwidth B and the average number of TCH TRX per cell is4 minus 1 BCCH = 3


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3.5 Cell Planning


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3.5 Cell Planning

3.5.1 Cell Planning - Frequency Planning (1)

Can frequency planning be seen independently from cell planning?

Discussion


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3.5 Cell Planning

3.5.2 Cell Planning - Frequency Planning (2)

Bad cell planning Island coverage disturbing the reuse pattern Big overlap areas bigger reuse necessary

Good cell planning Sharp cell borders good containment of frequency Small overlap areas tighter reuse possible


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3.5 Cell Planning

3.5.3 Influencing Factors on Frequency Reuse Distance

Topography

Hilly terrain Usage of natural obstacles to define sharp cell borders tighter frequency reuse possible

Flat terrain Achieveable reuse much more dependent on the accurate cell design

Morphology

Water low attenuation high reuse distance

City high attenuation low reuse distance


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3.5 Cell Planning

3.5.4 Conclusion

In cellular mobile networks, the frequency reuse pattern has a direct influence on the interference and hence the network quality

Regular hexagonal patterns allow the deduction of engineering formulas In real networks, cell sizes and shapes are irregular due to

Variation in traffic density Topography Land usage

Engineering formulas allow the assessment of the network quality and worst-case considerations, but the real situation must be proved!


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3.5 Cell Planning

3.5.5 Examples for different frequency reuses

Big city in the south of Africa: BCCH reuse 26

• Irregular cell design• Mixed morphology• Lots of water• Flat terrain plus some high sites

Big city in eastern Europe BCCH reuse 12

• Regular cell design• Flat area• Only urban environment


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3.6 Interference Probabiliti


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3.6 Interference Probability

3.6.1 Interference Theory (1)

C/I restrictions 9dB for co-channel interference -9 dB for adjacent channel interference

distance DR

Received PowerP rec

σC/ I

Prec, A Prec, B

0

C/I is the difference between the two received power lines

when shifting the two transmitters towards each other, the area where the C/I is > 9dB shrinks

At a certain distance of the two transmitters, the C/I can never fulfil the GSM criteria -> minimum site distance.

It has to be kept in mind, that of course other cells will be inbetween two cells transmitting at the same frequency!


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3.6.2 Interference Theory (2)

Probability density function [%]

0,0%

1,0%

2,0%

3,0%

4,0%

5,0%

C/I [dB] →C/ImedC/Ithr

Margin

Interferer probability [%]

0%

20%

40%

60%

80%

100%

-20 -15 -10 -5 0 5 10 15 20

C/I - C/Ithr[dB]

Interference probability C/Imed is the calculated carrier to

interference ratio at a certain location (pixel)

ARCS Pint[%]6.5..9.0 107.0..9.5 7.58.5..11.0 5.012.0..16.0 2.5


The marked area left of C/Ithr is the area of interference. Although the received level is above the threshold, there is a certain probability to get interference because of the standard deviation of the received signal.


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3.6.3 CPDF - Cumulative Probability Density Function

Pint = P ( C/I < C/I thr)

00,10,20,30,40,50,60,70,80,9

1

P int

Distance from serving cellDR

CPDF - Cumulative Probability Density Function


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3.6.4 Interference Probability dependent on Average Reuse

ARCS =# of frequencies in used bandwidth

average # of carriers per cellPint [%]

ARCS0

3

6

9

12

5 10 15 20 25

Examples:Pint[%] ARCS10 6.5...97.5 7...9.558.5...112.5

12...16


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3.7 Carrier Types


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3.7 Carrier Types

3.7.1 Carrier Types - BCCH carrier

BCCH frequency is on air all the time

If there is no traffic/signaling on TS 1 to 7 dummy bursts are transmitted

PC (Power Control) and DTX (Discontinuous Transmission) are not allowed

Important for measurements of the mobile

The BCCH frequency must be transmitted with full power all the time!

Otherwise the measurements of the neighborcell levels would be useless.


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3.7 Carrier Types

3.7.2 Carrier Types - TCH carrier

PC allowed and recommended for UL and DL Reduction of transmit power according to the actual path loss Careful parameter tuning for DL necessary

DTX allowed and recommended for UL and DL Discontinuous Transmission If there is no speech, nothing is transmitted Generation of comfort noise at receiving mobile

TCH not in use no signal is transmitted

Special case: Concentric cells Different re-uses for inner and outer zone are possible

PC and DTX are reducing the overall interference in the network.

As a TCH is not transmitting anything when not in use, the interference level is strongly related to the traffic on theinterfereing cells.


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3.8 Multiple Reuse Pattern MPR


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3.8 Multiple reuse pattern

3.8.1 Meaning of multiple reuse pattern (1)

For different types of carriers, different interference potential is expected

As the BCCH carrier has the highest interferer potential because of being on air all the time and the BCCH channel itself is accepting only low interference, the REUSE on the BCCH layer is higher then on other layers

TCH layers can be planned with a smaller REUSE

Inner zones of concentric cells are able to deal with the smallest reuse in non hopping networks


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3.8.2 Meaning of multiple reuse pattern (2)

REUSE clusters for INNER ZONE layer

TCH layer

BCCH layer

When applying different reuses in the different cell layers, of course separated bands are necessary!


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3.8.3 GSM restrictions

Intra site minimum channel spacing 2Intra cell minimum channel spacing 2 (ETSI recommends 3, but with Alcatel EVOLIUM capabilities this value can be set to 2) constrains:

• Uplink power control enabled• Intra cell interference handover enabled

f A1,

f A2,f A

3,...

fB1 ,fB2 ,fB3 ,...f C1

,f C2,f C3

,...

Frequencies fAx,fBx,fCx,… must have at least 2 channels spacing

Frequencies fx1,fx2,fx3,… must have at least 3 channels spacing

The Intra cell minimum channel spacing of 3 is given by the combiner in the BTS, to avaoid IM problems

Important remark: the whole training is compliant to the co-cell constraint of 3 channels ; this is more restrictive than the BTS capability of filtering the channels on frequency n*200 kHz

Acc to A.Krause: for Evolium BTS standard equipped with WBC the co-cell constraint can be only 2 channels.

(A channel spacing of 2 was tested @Vodacom in 1999 but the result was not better than with channel spacing of 3.)


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3.9 Intermodulation


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3.9 Intermodulation

3.9.1 Intermodulation problems (1)

IM Products GSM900 In a GSM 900 system intermodulation products of 3rd and 5th order

can cause interference• 2 * f1,t – f2,t = f2,r / 2 * f2,t – f1,t = f1,r

• 3 * f1,t – 2 * f2,t = f2,r / 3 * f2,t – 2 * f1,t = f1,r

Frequency planning must avoid fulfilling these equations

Both frequencies must be on the same duplexer

To avoid intra band IM inside GSM900 the following frequency separations shall be avoided:

• 75/112/113 channels

IM5 IM3

Info from techn. dept: If a WBC has to be used because of the number of TRXs, the output power is not high enough to cause problems. -> No intermodulation problems .


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3.9 Intermodulation

3.9.2 Intermodulation problems (2)

IM Products GSM1800 In a GSM 1800 system, only intermodulation products of 3rd order can

cause measurable interference 2 * f1,t – f2,t = f2,r / 2 * f2,t – f1,t = f1,r

Frequency separations to be avoided

• 237/238 channels

IM Products Dual Band (GSM900/GSM1800)

f1800,t – f900,t = f900,r

Decoupling between the GSM 1800 TX path and the GSM 900 RX path is less than 30 dB (e.g. same antenna used!)


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3.9 Intermodulation

3.9.3 Intermodulation problems (3) - Summary

carrier/antenna restrictionG3 900 1 noG3 900 2 ore more 112/113 (IM3) and 75 (IM5)G3 1800 1 noG3 1800 2 or more 237/238 (IM3) no IM5 quality degradation measurable

carrier/antennaG2 900 w/o dupl 1 no

2 or more noG2 900 with dupl 1 no

2 or more 112/113 (IM3) and 75 (IM5)G2 1800 w/o dupl 1 no

2 or more noG2 1800 with dupl 1 no

22

G3 900 G2/G3 1800 f(1800,t) - f(900,t) = f(900,r)

G2 900 w/o dupl G2/G3 1800 no

G2 900 with dupl G2/G3 1800 f(1800,t) - f(900,t) = f(900,r)

Colocated BTSs

dud2(high Power) -> nodupd -> 237/238

OUTSIDE Problem: Dual Band

INSIDE Problem: IM3 / IM5

Problem only for non hopping and BCCH carriers

Problem can be solved by hopping over more than 10 frequencies

Caution: SFH doesn’t bring additional benefits when hopping over more than 4 frequencies


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3.9 Intermodulation

3.9.4 Treating “neighbor” cells

Cells, which are not declared as neighbor cells but are located in the neighborhood may use adjacent frequencies if it is not avoidable, but no co channel frequencies

Cells which are declared as neighbors, thus have HO relationships, must not use co or adjacent frequencies

If an adjacent frequency is used, the HO will be risky and at least audible by the user


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3.9 Intermodulation

3.9.5 Where can I find neighbor cells?

At the OMC-R for each cell a list of neighbor cells is defined

Maximum number of neighbors: 32

The list of neighbors and their frequencies is transmitted to the mobile to be able to perform measurements on these frequencies

In case of a HO cause, the HO will be performed towards the bestneighbor


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3.10 Manual Frequency Planning


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3.10.1 Frequency planning (1)

No fixed method

Free frequency assignment possible, but very time consuming for larger networks

For easy and fast frequency planning: use group assignment

Example:18 channels, 2TRX per cell ARCS 9


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3.10.2 Frequency planning (2)

GSM restrictions are automatically fulfilled, if on one site only groups A* or only B* are used

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18

A1B1A2B2A3B3A4B4A5


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3.10.3 Exercise: Manual frequency planning (1)

A1

A2 A3

A2

A4 A5

B4

B1

B2 B3

B1

B2

A1

A2 A3A2A4

A5

B4

B1B2

A1

A2 A3


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3.10.4 Exercise: Manual frequency planning (2)

A1

A2A3

A2

A4 A5

B4

B1

B2 B3

B1

B2

A1

A2A3A2A4

A5

B2

B4B1

A3

A2A1


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3.10.5 Discussion: Subdivide Frequency Band?

Any subdivision of the frequency band is reducing the spectrum efficiency!

Separations should be avoided if possible!

As the BCCH has to be very clean, it is nevertheless recommendedto use a separated band and select a bigger reuse

The focus in the discussion is not the fx band splitting by fx management authorities.


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3.10.6 Hint for creating a future proofed frequency plan

If a frequency plan is implemented, using all available frequencies in the most efficient way, it is very difficult to implement new sites in the future!

New sites would make a complete re-planning of the surrounding area or the whole frequency plan necessary

To avoid replanning every time when introducing new sites, it is recommended to keep some Joker frequencies free

These Joker frequencies can be used for new sites (especially BCCH TRXs) unless it is impossible to implement new sites without changing a big part of the frequency plan

New frequency plan necessary!


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3.10.7 Implementing a frequency plan

If only a few frequencies have to be changed, the changes can bedone at the OMC-R Disadvantage: Every cell has to be modified separately Downtime of the cell approx. 5 minutes

If lots of changes have to be done, it is of advantage to use external tools Since B6.2 the complete frequency plan can be uploaded from the OMC the uploaded file can be modified by the tool (A9155 PRC Generator) the the new plan is downloaded into the network and activated at once


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3.11 BSCI Planning


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3.11 BSIC Planning

3.11.1 BSCI allocation

Together with the frequencies the Base Transceiver Station Identity Code (BSIC) has to be planned

The BSIC is to distinguish between cells using the same BCCH frequency

BSIC = NCC (3bits) + BCC (3bits) NCC Network (PLMN) Colour Code BCC - Base Transceiver Station (BTS) Colour Code

BSIC planning is supported by the A9155 (Alcatel Radio Network Planning Tool)


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3.11 BSIC Planning

3.11.2 BSIC Planning Rules

The same combination BCCH/BSIC must not be used on cell influencing on each other (having a mutual interference <>0)

BSIC allocation rules: Avoid using same BCCH/BSIC combination of:

• neighbours cells• second order neighbour cells (the neighbours of neighbour cell (OMC limitation))

Neighbour Cell

BCCH:24

BSIC:36

Neighbour Cell

BCCH:24

BSIC: must NOT be 36

Serving Cell

BCCH:10

BSIC: any

A

B C


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3.11 BSIC Planning

3.11.3 Spurious RACH

Bad BSIC planning can cause SDCCH congestion cause by the spurious RACH problem, also known as “Ghost RACH”

This problem occurs, when a mobile sends an HO access burst to aTRX of cell A using the same frequency as a nearby cell B uses on the BCCH

Both cells using the same BSIC and Training Sequence Code TSQC, the HO access burst is understood by the cell B as a RACH for call setup

Therefore on cell B SDCCHs are allocated everytime a HO access burst is sent from the mobile to the cell A

If in cell B the BCCH and TRX 2 exchange their frequencies (BCCH gets the fx of TRX2 and TRX2 gets the fx of BCCH): no problem with spurious RACH

Cell BF1 F2

BSIC=1

Cell AF5F1

BSIC=1

Cell C


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3.11 BSIC Planning

3.11.4 Summary

For optimal usage of your frequency spectrum a good cell design is essential

Use larger reuse for BCCH frequencies Use spectrum splitting only when necessary


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3.12 Capacity Enhancement Techniques


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3.12.1 Capacity enhancement by planning

Interference reduction of cells Check of antenna type, direction and down tilt

• This is a check of cell size, border and orientation

Check of proper cabling• Is TX and RX path on the same sector antenna?

Check of the frequency plan• Introduction of a better frequency plan


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3.12.2 Capacity enhancement by adding feature

Frequency hopping Base band hopping Synthesized frequency hopping

Concentric cells Half rate


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3.12.3 Capacity enhancement by adding TRX

Adding TRX to existing cells Multi band cells Concentric cells


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3.12.4 Capacity enhancement by adding cells

Adding of cells at existing site locations Adding new cell = adding new BCCH Dual band

Adding cells using another frequency band

Cell splitting Reduction of cell size Change of one omni cell into several cells/sector cells


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3.12.5 Capacity enhancement by adding sites

Dual band/multi band network Adding of new sites in new frequency band

Multi layer network Adding of new sites in another layer

• E.g. adding micro cells for outdoor coverage

Indoor coverage Adding micro cells indoor coverage Adding macro cells indoor coverage


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4 Radio Interface


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4 Radio Interface

4.1 GSM Air Interface


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4.1.1 Radio Resources

Radio Spectrum Allocation

Frequency(FDMA)

Time(TDMA)

Timeslot0<TN<7

TDMA Frames0<FN<FN_MAX

Carrier Frequencies (ARFCN)

Cell Allocation(CA)

Mobile Allocation(MA)

FDMA Frequency division multiple accessTDMA Time division multiple accessARFCN Absolute radio frequency channel numberTN Timeslot numberFN Frame number


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FDMA and TDMA with 8 time slots per carrier RF frequency band

(E)GSM: (880) 890 ... 915 MHz Uplink (MS → BS)(925) 935 ... 960 MHz Downlink (BS → MS)

GSM1800: 1710 ... 1785 MHz Uplink1805 ... 1880 MHz Downlink

200 kHz bandwidth Number of carriers: 124 (GSM); 374 (DCS); 49 (E-GSM)


4.1.2 GSM Transmission Principles (1)

GSM: Flower (n) = 890 + 0.2 · n MHz with 1 ≤ n ≤ 124E-GSM: Flower (n) = 890 + 0.2 · n MHz with 0 ≤ n ≤ 124

Flower (n) = 890 + 0.2 · (n -1024) MHz with 975 ≤ n ≤ 1023DCS : Flower (n) = 1710.2 + 0.2 · (n - 512) MHz with 512 ≤ n ≤ 885

(E)GSM: Fupper (n) = Flower (n) + 45 MHzDCS: Fupper (n) = Flower (n) + 95 MHz


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4.1.3 GSM Transmission Principles (2)

Channel types Traffic Channels (TCH)

• Full rate• Half rate

Control Channels (CCH)• Broadcast Control Channel (BCCH)• Common Control Channel (CCCH)• Dedicated Control Channel (DCCH)

TDMA frame cycles 26 cycle for traffic channels 51 cycle for control channels


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4.1.4 Advantages of Signal Processing

Spectrum limitationsBad propagation

conditions

P

t

Good spectrum efficiency Good transmission quality

Operator


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4.1.5 Signal Processing Chain

stealing bit and FACCH

speechcoding

errorprotection

interleaving encryption modulation

radiochannel

stealing bit and FACCH

speechinput

speechdecoding

errorcorrection

de-interleaving decryption demodulation

speechoutput

LossNoise

InterferenceFading


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4 Radio Interface

4.2 Channel Coding


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4.2 Channel Coding

4.2.1 Speech Coding

260 bits speech block

182 class 1 bits

20 ms of coded speech

78 class 2 bits

sensitive to bit errorsmust be protected

robust to bit errors

Coding algorithm: RPE-LTP Pre-computation RPE = Regular Pulse Excitation

• Model of human voice generation

LTP = Long Term Prediction• Reduction of bit rate

Bit rate: 13 kBit/s

Coding at fixed network: PCM A-lawBit rate: 64 kBit/s


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4.2 Channel Coding

4.2.2 Error Protection

Messages (signalling data)

Fire Code

184 bits

184 40

4

Convolutional Coder = 1/2, K = 5

456 = 24 x 19

456 bits in 20 ms = 22.8kbit/s

Convolutional Coder = 1/2, K = 5

Tail bits

Parity check

Cycliccode

Speech (full rate)

Tail bits

Class 1a50 bits

Class 1b132 bits

Class 278 bits

= 456= 8 x 5737

878

50

3 132 4

260 bits


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4.2 Channel Coding

4.2.3 Interleaving and TDMA Frame Mapping

1 2 3 4 5 6 70 1 2 3 4 5 6 70

Mappingonto bursts

....

.

....

.

Addition of stealing flags

....

.

Interleaving

....

.

....

.

....

.

2 x 57 bits

Block n-1 (456 bits)

57 bits Block n (456 bits) Block n+1 (456 bits)

1 2 3 4 5 6 70

1 time slot

114 bits 114 bits 114 bits 114 bits 114 bits 114 bits 114 bits 114 bits

116 bits 116 bits 116 bits 116 bits 116 bits 116 bits 116 bits 116 bits

burst n-3 burst n-2 burst n-1 burst n burst n+1 burst n+2 burst n+3 burst n+4


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4.2 Channel Coding

4.2.4 Encryption

AlgorithmA3

Randomnumber

generator

AlgorithmA8

IMSIKi

Ki RAND (128 bit)

+

Authentication

yes/noAlgorithm

A3

AlgorithmA8

RAND

SRES (32 bit)

SIMCard

Ki

AlgorithmA5

AlgorithmA5

+

Kc (64 bit)

+

RAND

Kc

originaldata

originaldata

encrypted

data

encrypted

data

Network Mobile station

AuC


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4.2 Channel Coding

4.2.5 Burst Structure

0 1 2 3 4 5 6 7

TDMA frame = 4.615 ms

Data TrainingSequence Data

57 bits3 26 bits1 31 57 bits

tail bits tail bitsstealing flags

156.25 bit periods = 0.577 ms

GP GP

A burst contains one data "portion" of one timeslot

TDMA frame: time between two bursts with same timeslot number

The burst also consists of: Guard period (GP): allows for

transition and settling times Tail bits: allow for small shifts in

time delay (synchronisation) Stealing flags: to indicate FACCH

(control channel) data Training sequence: for

equalization purposes

Normal Burst

0


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4.2 Channel Coding

4.2.6 Synchronisation

received at MS(downlink)

transmitted from MS(uplink)

transmitted from BTS(downlink)

received at BTS(uplink)

Transmitted bursts need a travelling time (TT) to the receiver For network access, the MS sends a (non-synchronized) shortened RACH burst The BSS measures the TT and generates a timing advance value TA which is transmitted

to the MS

0 1 2 3

1 2

0 1 2

1 2

TT TT

non-synchronized

3 TSdelay

0 1 2 3 4 5 6 7 0 1

0 1 2 3 4 5 6 7 0 1

0 1 2 3 4 5 6 7 0 1

0 1 2 3 4 5 6 7 0 1

TT

TT

synchronized

RACH

MS delay line setting

1

4

2

3


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4.2 Channel Coding

4.2.7 Modulation

Gaussian minimum shift keying Based on phase shift keying Reduction of required bandwidth

• Maximum phase change during one bit duration• Baseband filtering to achieve continuous phase changes

∫

cos

sin

+

x

x

≈90°

to RF modulatorDataϕ


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4.2 Channel Coding

4.2.8 Propagation Environment

Radio propagation is characterised by dispersive multi-path caused by reflection and scattering

Moving MS causes Doppler spectrum→ Definition of propagation models in the time

domain to allow channel simulations TUxx (Typical Urban) RAxx (Rural Area) HTxx (Hilly Terrain) xx = speed in km/h

see also GSM 05.05, 11.20, 11.21


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4.2 Channel Coding

4.2.9 Equalizing

Purpose: equalize distortions in transmission spectrum Adaptive filtering required

Filter parameters determined out of the training sequence Filter parameters change from burst to burst

Equalizer takes advantage from multipath propagation (path diversity)

0.001

0.01

0.1

0 1 2 3 4 5 6 7 8

Delay of second path [chips]

BER

noneAlcatelMLSE

Equalizer


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4.2 Channel Coding

4.2.10 Definition of Bit Error Rates

FER = Frame Erasure Rate Ratio of corrupted frames, indicated by a wrong CRC (cyclic redundancy

checksum) and BFI (bad frame indicator)

RBER = Residual Bit Error Rate considering corrupted frames not recognized as bad frames

BER = total bit error rate Consideration of class 1 or 2 bits → e.g. RBER1b, RBER2

see also GSM 05.05, 11.20, 11.21


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BER Quality

>0.01 no communication<0.005 “bad”<0.0025 “marginal”<0.0003 “good”<0.0001 “excellent”

Thresholds:

C/I: 9 dBEc/No: 8 dBBTS (GSM900): -104 dBmHH (GSM900): -102 dBmBTS (GSM1800): -104 dBmHH (GSM1800): -100 dBm

4.2 Channel Coding

4.2.11 Speech Quality

HH - handheld

RXQUAL_0 BER <0,2%

RXQUAL_1 0,2%<BER<0,4%





RXQUAL_6 6,4%<BER<12,8%

RXQUAL_7 12,8%<BER


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4.2 Channel Coding

4.2.12 Dependence of BER on Noise and Interference

Variation of BER1 over C/I Parameter: Ec/N0

How to find a quality figure? BER1 for marginal speech quality: 0.25% required C/I ≈ 9 dB for TU50 environment but: signal must not be close to noise floor!

C/I [dB] →

TU50BER1

→


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4.2 Channel Coding

4.2.13 Frequency Hopping (1)

-70

-60

-50

-40

-30

-20

-10

0

0.1

2.8

5.4

8.0

10.6

13.2

15.9

18.5

21.1

23.7

26.3

29.0

31.6

34.2

36.8

39.4

42.1

44.7

47.3

49.9

Distance [m]

Rec

eive

dPo

wer

[dB

m]

Lognormal fadingRaleygh fading

Problem: specific fading pattern for each used frequency

Fast MS cope with the situation (due to signal processing)

Slow MS suffer from fading holes

Solution: change the fading pattern by frequency hopping

Fading holes


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4.2 Channel Coding

4.2.14 Frequency Hopping (2)

Variation of BER1 over Ec/N0 TU environment, flat fading, v = 0

km/h (worst case) Parameter: number of hopping

frequencies

Compensation with 4 hopping frequencies possible

Ec/N0 [dB] →

BER→


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4.2 Channel Coding

4.2.15 The OSI Reference Model

Definition in GSM recommendations: layers 1 to 3Notion of "Physical" channels and "Logical" channels

7

6

5

4

3

2

1

Application layer

Presentation layer

Session layer

Transport layer

Network layer

Data link layer

Physical layer

End system End systemTransportation system

04.0408.54

04.05/0608.56

04.07/0808.58/4.0

8


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4.2 Channel Coding

4.2.16 GSM Burst Types (1)

Normal Burst For regular transmission

Frequency Correction Burst Contains 142 zeros (0) → pure sine wave Allows synchronisation of the mobile's local oscillator

Synchronisation Burst Consists of an enlarged unique training sequence code (TSC) Contains the actual FN → time synchronisation

Access Burst Shortened burst (unique TSC and enlarged guard period) Timeslot overlapping avoided at BTS when MS accesses network

Dummy Burst "Filler" for unused BCCH timeslots → BCCH permanently on air Similar to normal burst (defined mixed bits for data, no stealing flag)


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4.2 Channel Coding

4.2.17 GSM Burst Types (2)

TB3

57 data bits 126 bit training

sequence1 57 data bits

TB3

Normal burstGP

8.25

TB3

142 fixed bits (pure sine wave)TB3

Frequency correction burstGP

8.25

TB3

39 data bits 64 bit trainingsequence

39 data bits TB3

Synchronisation burstGP

8.25

TB8

36 data bits41 bit synchronisationsequence

Access burstenlarged GP

68.25 bitTB3


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4.2 Channel Coding

4.2.18 Logical Channels

Trafficchannel

Controlchannel

Speech Data

TCH/FS

TCH/HS

TCH/F9.6

TCH/F4.8

TCH/F2.4

TCH/H4.8

TCH/H2.4

CCCHBroadcastchannel

Associatedchannel

Dedicatedchannel

FCCH

SCH

BCCH

RACH

PCH

AGCH

FACCH

SACCH

SDCCH

CBCH


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4.2 Channel Coding

4.2.19 Possible Channel Combinations

1

2

3

4

5

6

7

TCH/F+FACCH/F+SACCH/TF

TCH/H(0.1)+FACCH/H(0.1)+SACCH/TH(0.1)

TCH/H(0.0)+FACCH/H(0.1)+SACCH/TH(0.1)+TCH/H(1.1)

FCCH+SCH+BCCH+CCCH

FCCH+SCH+BCCH+CCCH+SDCCH/4(0..3)+SACCH/C4(0..3)

BCCH+CCCH

SDCCH/8(0..7)+SACCH/C8(0..7)

CCCH = PCH+RACH+AGCH Combination 4 and 5 is only possible on TS0 of the first (BCCH)

carrier Combination 6 is possible on TS2, TS4, or TS6 of the BCCH carrier


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4.2 Channel Coding

4.2.20 Channel Mapping (1)

time

.......

.......

.......

0 0 0 01 1 112 2 223 3 334 4 445 556 6 67 7 7

one TDMA frame = 4.616 ms

Information packages are always related to the same timeslot number!

Bursts are transmitted and received every TDMA frame duration (4.616 ms)Presentation of consecutive

TDMA frames on the vertical axis


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4.2 Channel Coding

4.2.21 Channel Mapping (2)

SCH

FCCH RACH

SCH

FCCH

SCH

FCCH

SCH

FCCH

SCH

FCCH

RACH

RACH

RACH

RACH

RACH

RACH

RACH

RACH

RACH

RACH

RACH

RACH

RACH

RACH

RACH

RACH

RACH

RACH

RACH

RACH

RACH

RACH

RACH

RACH

RACH

RACH

RACH

RACH

RACH

RACH

RACH

RACH

RACH

RACH

RACH

RACH

RACH

RACH

RACH

RACH

RACH

RACH

RACH

RACH

RACH

RACH

RACH

RACH

RACH

RACH

SCH

FCCH

SCH

FCCH

SCH

FCCH

SCH

FCCH

SCH

FCCH

SCH

FCCH

SCH

FCCH

SCH

FCCH

SCH

FCCH

SCH

FCCH

RACH

RACH

RACH

RACH

RACH

RACH

RACH

RACH

RACH

RACH

RACH

RACH

RACH

RACH

RACH

RACH

RACH

RACH

RACH

RACH

RACH

RACH

RACH

RACH

RACH

RACH

RACH

RACH

RACH

RACH

RACH

RACH

RACH

RACH

RACH

RACH

RACH

RACH

RACH

RACH

RACH

RACH

RACH

RACH

RACH

RACH

RACH

RACH

RACH

RACH

RACH

RACH

RACH

RACH

BCCH

CCCH

CCCH

CCCH

CCCH

CCCH

CCCH

CCCH

CCCH

CCCH

BCCH BCCH

CCCH

CCCH

CCCH

CCCH

CCCH

CCCH

SDCCH0

SDCCH1

SDCCH2

SDCCH3

SDCCH0

SDCCH1

SDCCH2

SDCCH3

SDCCH0

SDCCH1

SDCCH0

SDCCH1

SDCCH2

SDCCH3

SDCCH2

SDCCH3

SACCH0

SACCH1

SACCH2

SACCH3

TCH

TCH

TCH

TCH

TCH

TCH

TCH

TCH

TCH

TCH

TCH

TCH

SACCH

TCH

TCH

TCH

TCH

TCH

TCH

TCH

TCH

TCH

TCH

TCH

TCH

TCH

TCH

TCH

TCH

TCH

TCH

TCH

TCH

TCH

TCH

TCH

TCH

SACCH

TCH

TCH

TCH

TCH

TCH

TCH

TCH

TCH

TCH

TCH

TCH

TCH

SDCCH0

SDCCH1

SDCCH2

SDCCH3

SDCCH4

SDCCH5

SDCCH6

SDCCH7

SACCH0

SACCH1

SACCH2

SACCH3

SACCH0

SACCH1

SACCH2

SACCH3

SDCCH0

SDCCH1

SDCCH2

SDCCH3

SDCCH4

SDCCH5

SDCCH6

SDCCH7

SACCH4

SACCH5

SACCH6

SACCH7

SDCCH0

SDCCH1

SDCCH2

SDCCH3

SDCCH4

SDCCH5

SDCCH6

SDCCH7

SACCH0

SDCCH0

SDCCH1

SDCCH2

SDCCH3

SDCCH4

SDCCH5

SDCCH6

SDCCH7

SACCH1

SACCH2

SACCH3

SACCH4

SACCH5

SACCH6

SACCH7

0

10

20

30

40

50

0

10

20

30

40

50

0

12

25

0

12

25

not combined BCCH

downlink uplink downlink uplink downlink uplink

combined BCCH TCH SDCCH

up/downlink

Control channels Follows a 51-cycle Duration: 235.4 msec Consists mostly of four consecutive

blocks Synchronisation with FCCH and

SCH

Traffic channels Follows a 26-cycle Duration: 120 msec


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4.2 Channel Coding

4.2.22 TDMA Frame Structure for TCHs

TB3

57 data bits 126 bit trainingsequence

1 57 data bits TB3

GP8.25

0 1 2 3 4 5 6 7

0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25

Time slot

Frame

Multiframe

Superframe

Hyperframe

51 multiframes of 120 ms duration

2048 superframes of 6.12 s duration

0.577 ms

4.615 ms

120 ms

6.12 s

3 h 28 m 53 s


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Abbreviations and Acronyms

AMR Advanced Multi Rate (TC)AMSS Aeronautical Mobile Satellite ServicesAN Antenna Network (BTS)ARCS Average Reuse Cluster SizeARFCN Absolute Radio Frequency ChannelAS Access Switch (BSC)AS Alarm Surveillance (O&M)ASMA A-ter Submultiplexer AASMB A-ter Submultiplexer BAuC Authentication CenterBC BroadcastBCU Broadcast UnitBCLA BSC Clock ABCR Broadcast RegisterBCU Broadcast UnitBCCH Broadcast Common Control Channel

(GSM TS)BCF Base station Control Function (BTS)BG Border Gate (GPRS)

BIE Base Station Interface EquipmentBIEC Base Station Interface Equipment (BSC)BIUA Base Station Interface Unit ABPA Back Panel AssemblyBSC Base Station ControllerBSIC Base Transceiver Station Identity CodeBSS Base Station (sub)SystemBSSGP Base Station System GPRS Protocol

(GPRS)BTS Base Transceiver StationCAE Customer Application EngineeringCAL Current Alarm List (O&M)CBC Cell Broadcast CenterCBCH Cell Broadcast Channel (GSM TS)CBE Cell Broadcast EntityCCCH Common Control Channel (GSM TS)CCU Channel Coding Unit


RNE Fundamentals -


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Abbreviations and Acronyms [cont.]

CDMA Code Division Multiple AccessCE Control Element (BSC)CEK Control Element KernelC/I Carrier to Interferer ratioCLK ClockCLSI Custom Large Scale Integrated circuitCMA Configuration Management Application (O&M)CMDA Common Memory Disk ACMFA Common Memory Flash ACPR Common Processor (Type: CPRA, CPRC)CRC Cyclic Redundancy CheckCS Circuit Switching (Telecom)CS Coding Scheme (GPRS):

CS-1, CS-2, CS-3, CS-4CU Carrier Unit (BTS)DCE Data Circuit Terminating EquipmentDCN Data Communication NetworkDL DownLink

DLS Data Load SegmentDMA Direct Memory AccessDRFU Dual Rate Frame UnitDRX Discontinuous Reception (GSM TS)DSE Digital Switching ElementDSN Digital Switching NetworkDTX Discontinuous Transmission (GSM TS)DTC Digital Trunk Controller

(Type: DTCA, DTCC)DTE Data Terminal EquipmentEDGE Enhanced Data rates for GSM EvolutionEI Extension interfaceEML Element Management LevelEPROM Erasable Programmable Read Only

MemoryETSI European Telecom Standard InstituteFPE Functional and Protective EarthFR Full Rate (GSM TS)


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Switch to notes view!FR Frame Relay (Telecom)FRDN Frame Relay Data Network (Telecom)FU Frame Unit (BTS)FW FirmwareGCR Group Call RegisterGGSN Gateway GPRS Support Node (GPRS)GMLC Gateway Mobile Location CenterGMM GPRS Mobility Management (GPRS)GMSC Gateway Mobile Switching CenterGPRS General Packet Radio ServiceGPU GPRS Packet UnitGS-1 Group Switch of stage 1 (BSC)GS-2 Group Switch of stage 2 (BSC)GSL GPRS Signalling LinkGSM Global System for Mobile CommunicationsGSM TS GSM Technical SpecificationHAL Historical Alarm List (O&M)HDSL High rate Digital Subscriber LineHDLC High Level Datalink Control

HLR Home Location RegisterHMI Human Machine InterfaceHO HandOverHR Half RateHW HardwareIDR Internal Directed RetryILCS ISDN Link ControllerIMT Installation and Maintenance Terminal

(MFS)IND Indoor (BTS)IP Internet ProtocolISDN Integrated Services Data NetworkIT Intelligent TerminalLA Location Area (GSM TS)LAC Location Area Code (GSM TS)LAN Local Area NetworkLED Light Emitting DiodeLEO Low Earth Orbit (Satellite)LCS Location Services


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Switch to notes view!PCH Paging CHannel (GSM TS)PCM Pulse Coded ModulationPCU Packet Control Unit (GPRS)PDCH Packet Data CHannelPDN Packet Data Network (Telecom)PDU Protocol Data Unit (generic terminology)PLL Phase Locked LoopPLMN Public Land Mobile NetworkPMA Prompt Maintenance Alarm (O&M)PMC Permanent Measurement Campaign

(O&M)PPCH Packet Paging CHannel (GPRS)PRACH Packet Random Access CHannel (GPRS)Prec Received PowerPRC Provisioning Radio Configuration (O&M)PSDN Packet Switching Data Network

(Telecom)

PSTN Public Switching Telephone Network(Telecom)

PTP-CNLS Point To Point CoNnectionLeSs datatransfer (GPRS)

QoS Quality of ServiceRA Radio AccessRACH Random Access CHannel (GSM TS)RAM Random Access MemoryRCP Radio Control PointRLC Radio Link Control (GPRS)RLP Radio Link Protocol (GSM TS)RML Radio Management LevelRNO Radio Network OptimisationRNP Radio Network PlanningRSL Radio Signalling Link


RNE Fundamentals -


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Switch to notes view!RTS Radio Time SlotRxLev Received LevelRxQual Received QualitySACCH Slow Associated Control Channel

(GSM TS)SAU Subrack assembly unit (BSC)SC Supervised Configuration (O&M)SCC Serial Communication ControllerSCP Service Control PointSCCP Signalling Connection Control PartSCSI Small Computer Systems InterfaceSDCCH Standalone Dedicated Control Channel

(GSM TS)SDU Service Data Unit (generic terminology)SGSN Serving GPRS Support Node (GPRS)SIEA SCSI Interface Extension A

SM SubmultiplexerSMLC Serving Mobile Location CenterSMP Service Management PointSMS Short Message ServiceSMS-CB Short Message Service - Cell BroadcastSM-GMSC Short Message Gateway Mobile Switching

CenterSRAM Static RAMSRS SubRate SwitchSS7 Signalling System ITU-T N°7 (ex CCITT)SSD Solid State DiskSSP Service Switching PointSW SoftwareSWEL Switch ElementTBF Temporary Block Flow (GPRS)TAF Terminal Adaptor Function


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Switch to notes view!TC TranscoderTC Terminating CallTCC Trunk Controller ChipTCH Traffic CHannel (GSM TS)TCIL TransCoder Internal LinkTCSM TransCoder / SubMultiplexer equipmentTCU TRX Control Unit (Type: TCUA, TCUC)TDMA Time Division Multiple AccessTFO Tandem Free Operation (TC)TFTS Terrestrial Flight Telecom SystemsTLD Top Level DesignTMN Telecommunication Management

NetworkTRAC Trunk Access CircuitTRAU Transcoder and Rate Adapter UnitTRCU Transcoder UnitTRE Transceiver EquipmentTRS Technical Requirement SpecificationTRU Top Rack Unit

TRX TransceiverTS Time SlotTS Technical Specification (GSM TS)TSS Time Space Switch TSCA Transmission Sub-System Controller A

(BSC) TSU Terminal Sub Unit (BSC)TU Terminal Unit (BSC)UL UpLinkUMTS Universal Mobile Transmission SystemUSSD Unstructured Supplementary Services DataVBS Voice Broadcast ServiceVGCS Voice Group Code ServiceVLR Visitor Location RegisterVPLMN Visited PLMNVSWR Voltage Standing Wave Ratio (BTS)WAN Wide Area NetworkWAP Wireless Application ProtocolWBC Wide Band Combiner


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End of Module

rne fundamentals b9 3fl11820

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