zxg10 ibsc (v6[1].00) board

ZXG10 iBSCBase Station Controller

Technical Manual

Version 6.00

ZTE CORPORATION ZTE Plaza, Keji Road South, Hi-Tech Industrial Park, Nanshan District, Shenzhen, P. R. China 518057 Tel: (86) 755 26771900 800-9830-9830 Fax: (86) 755 26772236 URL: http://support.zte.com.cn E-mail: [email protected]

LEGAL INFORMATION Copyright 2006 ZTE CORPORATION. The contents of this document are protected by copyright laws and international treaties. Any reproduction or distribution of this document or any portion of this document, in any form by any means, without the prior written consent of ZTE CORPORATION is prohibited. Additionally, the contents of this document are protected by contractual confidentiality obligations. All company, brand and product names are trade or service marks, or registered trade or service marks, of ZTE CORPORATION or of their respective owners. This document is provided as is, and all express, implied, or statutory warranties, representations or conditions are disclaimed, including without limitation any implied warranty of merchantability, fitness for a particular purpose, title or non-infringement. ZTE CORPORATION and its licensors shall not be liable for damages resulting from the use of or reliance on the information contained herein. ZTE CORPORATION or its licensors may have current or pending intellectual property rights or applications covering the subject matter of this document. Except as expressly provided in any written license between ZTE CORPORATION and its licensee, the user of this document shall not acquire any license to the subject matter herein. The contents of this document and all policies of ZTE CORPORATION, including without limitation policies related to support or training are subject to change without notice.

Revision History

Date Revision No. Serial No. Reason for Revision

12/19/2006 R1.0 sjzl20062156 First edition

ZTE CORPORATION Values Your Comments & Suggestions! Your opinion is of great value and will help us improve the quality of our product documentation and offer better services to our customers.

Please fax to: (86) 755-26772236; or mail to Documentation R&D Department, ZTE CORPORATION, ZTE Plaza, A Wing, Keji Road South, Hi-Tech Industrial Park, Shenzhen, P. R. China 518057.

Thank you for your cooperation!

Document Name ZXG10 iBSC (V6.00) Base Station Controller Technical Manual

Product Version V6.00 Document Revision Number R1.0

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Contents

About this Manual............................................................. i Purpose................................................................................ i Intended Audience ................................................................. i Prerequisite Skill and Knowledge .............................................. i What is in This Manual............................................................ i Related Documentation.......................................................... ii Conventions......................................................................... ii How to Get in Touch............................................................. iii

Declaration of RoHS Compliance..................................... v

Chapter 1.......................................................................... 1

System Overview............................................................. 1 System Background ..............................................................1 Position of iBSC in Network ....................................................2 System Features...................................................................2 System Functions .................................................................3 Standards Complied ..............................................................8

Chapter 2........................................................................11

System Indices ..............................................................11 Physical Indices .................................................................. 11 Clock Indices...................................................................... 12 Power Supply Indices .......................................................... 13 Environmental Conditions..................................................... 14 Reliability Indices................................................................ 15 Interface Indices................................................................. 15 Capacity Indices ................................................................. 17

Chapter 3........................................................................19

System Architecture ......................................................19 System Composition............................................................ 19

Hardware System................................................................20 Shelves..............................................................................21 Boards...............................................................................21 Software System.................................................................23

Chapter 4........................................................................27

Interfaces and Protocols ...............................................27 External Interfaces........................................................ 27

A-Interface.........................................................................28 Abis Interface .....................................................................29 Gb Interface .......................................................................29 Foreground/Background Interface..........................................29

Protocols ..................................................................... 30 Protocols in CS domain ........................................................30 Protocols in PS Domain ........................................................33

Chapter 5........................................................................37

Data Flow Direction .......................................................37 System clock Signal Flow......................................................37 User Plane Data Flow ...........................................................38 Control Plane Data Flow .......................................................39

Chapter 6........................................................................43

Networking Modes and System Configuration .............43 Networking Modes......................................................... 43

Abis Interface Networking Modes...........................................43 A Interface Networking Modes...............................................47 Gb Interface Networking Modes.............................................47 Operation and Maintenance System Networking.......................48

System Configuration .................................................... 51 Cabinet Configuration ..........................................................51 Shelf Configuration..............................................................53

Appendix A.....................................................................59

Abbreviations.................................................................59

Appendix B .....................................................................65

Figures............................................................................65

Tables.............................................................................67

Index..............................................................................69

This page is intentionally blank

Confidential and Proprietary Information of ZTE CORPORATION i

About this Manual

Purpose

The purpose of this manual is to introduce the technical specifications and working of ZXG10 iBSC (V6.00). In addition, to provide information about the technology involved in the designing of ZXG10 iBSC (V6.00) system.

Intended Audience

This document is intended for engineers and technicians who perform operation activities on the ZXG10 iBSC Base Station Controller.

Prerequisite Skill and Knowledge

To use this document effectively, users should have a general understanding of wireless telecommunications technology. Familiarity with the following is helpful:

The ZXG10 system and its various components

User Interface on Base Station Controller (BSC)

Local operating procedures

What is in This Manual

This manual contains the following chapters.

T AB L E 1 M AN U AL S U M M AR Y

Section Summary

Chapter 1, System Overview

This chapter describes the system background, features, and standards complied in ZXG10 iBSC (V6.00) system.

ZXG10 iBSC (V6.00) Base Station Controller Technical Manual

ii Confidential and Proprietary Information of ZTE CORPORATION

Chapter 2, System Indices

This chapter describes the physical, clock, power, capacity, and interface indices of ZXG10 iBSC (V6.00).

Chapter 3, System Architecture

This chapter describes the ZXG10 iBSC (V6.00) hardware system, software system, and shelf introduction.

Chapter 4, Interfaces and Protocols

This chapter describes about A, Abis, and Gb interfaces, and protocols of ZXG10 iBSC (V6.00).

Chapter 5, Data Flow Direction

This chapter describes the control plane and user plane signal flow in PS and CS domain under A/Gb mode.

Chapter 6, Networking Modes and System Configuration

This chapter describes about the networking modes and system configuration of ZXG10 iBSc (V6.00).

Appendix A, Abbreviations List of abbreviation used in the manual.

Appendix B, Figures and Tables List of figures and tables in the manual.

Index Contains the index of manual.

Related Documentation

The following documents are related to this manual:

ZXG10 iBSC (V6.00) Base Station Controller Documentation Guide

ZXG10 iBSC (V6.00) Base Station Controller Hardware Manual

ZXG10 iBSC (V6.00) Base Station Controller Installation Manual

ZXG10 iBSC (V6.00) Base Station Controller Maintenance Manual (Routine Maintenance)

Conventions

ZTE documents employ the following typographical conventions.

T AB L E 2 TY P O G R AP H I C A L C O N V E N T I O N S

Typeface Meaning

Typographical Conventions

About this Manual

Confidential and Proprietary Information of ZTE CORPORATION iii

Typeface Meaning

Italics References to other Manuals and documents.

Quotes Links on screens.

Bold Menus, menu options, function-names, input fields, radio button names, check boxes, drop-down lists, dialog box names, window names.

CAPS Keys on the keyboard and buttons on screens and company name.

Constant width Text that you type, program code, files and directory names.

[ ] Optional parameters.

{ } Mandatory parameters.

| Select one of the parameters that are delimited by it.

Note: Provides additional information about a certain topic.

Checkpoint: Indicates that a particular step needs to be checked before proceeding further.

Tip: Indicates a suggestion or hint to make things easier or more productive for the reader.

T AB L E 3 M O U S E OP E R AT I O N C O N V E N T I O N S

Typeface Meaning

Click Refers to clicking the primary mouse button (usually the left mouse button) once.

Double-click Refers to quickly clicking the primary mouse button (usually the left mouse button) twice.

Right-click Refers to clicking the secondary mouse button (usually the right mouse button) once.

Drag Refers to pressing and holding a mouse button and moving the mouse.

How to Get in Touch

The following sections provide information on how to obtain support for the documentation and the software.

If you have problems, questions, comments, or suggestions regarding your product, contact us by e-mail at [email protected]. You can also call our customer support center at (86) 755 26771900 and (86) 800-9830-9830.

Mouse Operation

Conventions

Customer Support


iv Confidential and Proprietary Information of ZTE CORPORATION

ZTE welcomes your comments and suggestions on the quality and usefulness of this document. For further questions, comments, or suggestions on the documentation, you can contact us by e-mail at [email protected]; or you can fax your comments and suggestions to (86) 755 26772236. You can also browse our website at http://support.zte.com.cn, which contains various interesting subjects like documentation, knowledge base, forum, and service request.

Documentation Support

Confidential and Proprietary Information of ZTE CORPORATION v

Declaration of RoHS Compliance

To minimize the environmental impact and take more responsibility to the earth we live, this document shall serve as formal declaration that the ZXG10 iBSC (V6.00) manufactured by ZTE CORPORATION is in compliance with the Directive 2002/95/EC of the European Parliament - RoHS (Restriction of Hazardous Substances) with respect to the following substances:

Lead (Pb)

Mercury (Hg)

Cadmium (Cd)

Hexavalent Chromium (Cr (VI))

PolyBrominated Biphenyls (PBBs)

PolyBrominated Diphenyl Ethers (PBDEs)

Compliance is evidenced by written declaration from our suppliers, assuring that any potential trace contamination levels of the substances listed above are below the maximum level set by EU 2002/95/EC, or are exempt due to their application.

The ZXG10 iBSC (V6.00) manufactured by ZTE CORPORATION meet the requirements of EU 2002/95/EC; however, some assemblies are customized to client specifications. Addition of specialized, customer-specified materials or processes which do not meet the requirements of EU 2002/95/EC may negate RoHS compliance of the assembly. To guarantee compliance of the assembly, the need for compliant product must be communicated to ZTE CORPORATION in written form.

This declaration is issued based on our current level of knowledge. Since conditions of use are outside our control, ZTE CORPORATION makes no warranties, express or implied, and assumes no liability in connection with the use of this information.


vi Confidential and Proprietary Information of ZTE CORPORATION


Confidential and Proprietary Information of ZTE CORPORATION 1

C h a p t e r 1

System Overview

This chapter contains following topics:

System background

Position of iBSC in network

System functions

System features

Standards complied

System Background

The idea of developing ZXG10 iBSC (V6.00) is to improve the capacity and make it compatible with 3G networks in the future.

ZXG10 iBSC (V6.00) is highly integrated system and has five times more capacity than ZXG10-BSC (2.96). It provides E1 and Fast Ethernet based Abis interface, which is a new feature.

ZXG10 iBSC (V6.00) is a part of GERAN (GSM/EDGE Ground Radio Access Network), which includes one or more BSS.

Structure of iBSC is based on the hardware structure of ZXWR RNC (WCDMA Radio Network Controller).

ZXG10 iBSC (V6.00) can be upgraded in future to support and work together with WCDMA. It can work as an intermediate BSC between the GSM and WCDMA networks. Following features of GERAN and iBSC can be provided in future:

To provide smooth access to mobile subscribers from GSM/EDGE network to UMTS.

GERAN can be accepted into the network system of UMTS, and provides the same service as UMTS network to end users, including various services such as session, streaming, and interactivity.

The connection of GERAN with CN (Core Network) through A/Gb/Iu interfaces.

Future Usage


2 Confidential and Proprietary Information of ZTE CORPORATION

The connection of iBSC with the WCDMA RNC through Iur-g interface.

Position of iBSC in Network

The position of iBSC in the network is shown in Figure 1.

F I G U R E 1 PO S I T I O N O F I BSC I N T H E N E T W O R K

GERAN

Gb

A

IuGSM/UMTS Core Network

MSUm

Iur-g

iBSC

BTS

BTS

BSS

BSS

MS

Iur-g

UTRANRNC

ZXG10 iBSC (V6.00) is a part of GERAN (the GSM EDGE Radio Access Network). GERAN includes one or multiple BSS, and one BSS consists of one BSC and one or multiple BTS. BSC is connected with BTS via Abis interface, and BSC-BSC, BSC-RNC are connected with each other via Iur-g interface.

GERAN is connected with GSM/UMTS Core Netwrok via A/Gb/Iu interface. GERAN has two working modes: A/Gb mode and Iu mode and can work in these two modes at the same time. In this case, the 2G MS uses A/Gb working mode, the working mode used by the MS supporting Iu mode depends on GERAN and MS together.

System Features

ZXG10 iBSC (V6.00) is the high capacity base station controller developed by ZTE cooperation independently, and the following are the main features:

All IP hardware platform

ZXG10 iBSC employs the all IP hardware platform the same as the 3G products of ZTE Corporation. The hardware platform based on all IP ensures powerful PS service support

Chapter 1 System Overview


capability and facilitates to realize IP Abis interface and IP Gb interface.

High capacity and strong processing capability

ZXG10 iBSC (V6.00) supports maximum 1536 sites and 3072 carriers with strong processing capability. High capacity and strong processing capability can reduce the complexity of networking, improve network quality and save the investment on equipment room.

Standard A interface

ZXG10 iBSC (V6.00) provides completely open A interface to ensure the interconnection of the equipment from different vendors.

Modulization, easy capacity expansion

ZXG10 iBSC (V6.00) employs modularized design, which facilitates the capacity expansion. Smooth expansion can be realized by module overlay.

Flexible networking mode

ZXG10 iBSC (V6.00) supports star, link, tree and ring networking of Abis interface, and also supports transmission equipment such as E1, satellite, microwave and optical fiber.

High integration and low power consumption

ZXG10 iBSC (V6.00) is highly integrated and occupies less area, which saves the investment in the equipment room.

ZXG10 iBSC (V6.00) has low overall power consumption, which reduces the operators investment on auxiliary power and air conditioning.

High reliability

The key components of ZXG10 iBSC (V6.00) employs 1+1 redundancy backup, which increases the system reliability.

System Functions

ZXG10 iBSC (V6.00) supports the service functions of base station controller in GSM Phase II and Phase II+ standards. Its main functions are as follows:

Supports GSM 900, GSM 850, GSM 1800 and GSM 1900 network.

Supports the base station management functions in the standard. It can manage the hybrid access of ZXG10 BTS series products.

Connects with OMC by foreground/background interface to realize the operation and maintenance management of BSS.

Supports various types of services.



i. Circuit Voice Services

f Full rate voice service

f Advanced full rate voice service

f Half rate voice service

f AMR voice service

AMR is one of the voice coding algorithms with variable rate. It adjusts the voice coding rate automatically according to the C/I value to ensure the best voice quality under different C/I.

According to the protocol, there are 8 AMR-FR voice coding rates. ZXG10 iBSC (V6.00) supports all 8 modes. And there are 5 AMR-HR voice coding rates (7.4 kbps, 6.7 kbps, 5.9 kbps, 5.15 kbps, 4.75 kbps), all supported by ZXG10 iBSC (V6.00).

ii. Circuit Data Services

f 14.4 kbps full rate data service




iii. Short Message Service, Chinese SMS supported

f Point to point SMS in case that MS is the called party

f Point to point SMS in case that MS is the calling party

f Cell broadcast service from SMS center or OMC

iv. GPRS

At present, main services available are point to point interactive telecommunication services, such as access database, session service, Tele-action service and so on.

v. EDGE Service

Supports channel management, including ground channel management, service channel management and control channel management.

f Ground channel management

It includes the ground channel management between MSC and BSC, the ground channel management between BSC and BTS and the channel management between BSC and SGSN.

f Service channel management includes channel allocation, link monitoring, channel release, and function control determination.

f Available channels: FCCH, SCH, BCCH, PCH, AGCH, RACH, SDCCH, SACCH, FACCH, PACCH, PAGCH, PBCCH, PCCCH, PPCH, PRACH, and PTCCH.



Supports frequency hopping

Supports DTX and VAD

Supports various handover types

f Supports synchronous handover, non-synchronous handover and pseudo-synchronous handover.

f Supports the handover intra 900 MHZ frequency band, 1800 MHZ frequency band and between 900 MHZ and 1800 MHZ frequency band.

f Handles handover measurement and switch over.

f Supports the handover originated by network since service or interference management.

f Supports the handover between the channels with different voice coding rate.

f Supports the handover when using DTX.

f Supports the handover caused by traffic.

f Supports the concentric ring handover based on carrier-to-interference ratio.

Supports 6-level static power control and 15-level dynamic power control of MS and BTS. Supports fast power control based on reception quality.

Supports overload and flow control

iBSC is able to locate and analyze the overload, and send the cause to the background. If the traffic is too heavy, control the flow at A interface, Abis interface, and/or Gb interface to reduce the flow and guarantee maximum network utilization.

Supports call-reestablishment when radio link is faulty

iBSC supports call queuing and forced call release during assignment and handover.

High end user preferential access

High end user preferential access, also called high priority user preferential access or EMLPP. It is used to divide the users into different priorities, and allocate the channel resource to the users according to the priority. The higher the priority of the user is, the easier to access the network.

Supports Co-BCCH.

Co-BCCH is usually used in dual-frequency common cell. Dual-frequency common cell is a cell that supports the carriers of two frequency bands, and the carriers of different carrier bands share one BCCH.

Co-BCCH networking has the following advantages:

f Save one BCCH time slot

f Configure the 1800 MHz carrier directly in 900 MHz cell. There is no need to change the original cell adjacent



relation, re-arrange network, and no need to consider the reselection and handover between the dual-frequency cell with common site.

Supports dynamic HR channel conversion

ZXG10 iBSC supports dynamic HR channel conversion. System is able to adjust HR/FR channel dynamically according to the traffic, and realize the conversion between HR/FR channels automatically.

Supports flow control

Flow control is a method to protect the system. It controls the overload by limiting some services to ensure that the system runs normally.

Supports dynamic radio channel allocation

ZXG10 iBSC supports the dynamic allocation of CS and PS channels.

In dynamic radio channel allocation, the logic type of radio channel is generated according to the current call type rather than configured at background NM. The advantage of dynamic radio channel is that it uses the radio resource the best according to the service type.

ZXG10 iBSC allocates the channel according to various factors, such as channel rate selection, carrier priority, interference band, the channel allocation in intra-cell handover, allocation of reservation channel, and the selection of sub-cell channel.

Supports voice version selection

ZXG10 iBSC provides the function of setting prior voice version; one prior voice version can be set for full rate and half rate channel. Full rate voice version is one of version I (FR), version II (EFR) and version III (AMR); half rate voice rate voice version is one of version I (HR) and version III (AMR).

Supports 3 digits network number

ZXG10 iBSC supports 3 digits network number. The current network number can be set as 2 or 3 digits. It interprets the MNC in the received signaling message at A interface and Gb interface, confirms the MNC format in the transmitted signaling, and confirms the MNC format in the broadcast message at Um interface according to the network number.

Supports the handover between 2G/3G system

f Support handover from 3G to 2G in CS service

f Support handover from 2G to 3G in CS service

Supports full dynamic Abis

Full dynamic Abis is that the corresponding relation of radio channel and Abis transmission channel is not generated in OMC, but is configured dynamically in service process.



Dynamic Abis is to provide more bandwidth in case the Abis transmission bandwidth is fixed.

Supports coding control

Compared with GPRS, the measurement report of EDGE is improved a lot. The EDGE measurement is based on each pulse, which means the measurement is performed by the granularity of Burst.

The fast measurement of EDGE makes the network is able to respond the change of the radio environment rapidly so that it can select the most proper coding mode and carry out power control.

In downlink direction, iBSC supports selecting the coding mode by time slot and by TBF.

In uplink direction, iBSC selects the uplink TBF coding mode according to the measurement parameters of the uplink channel reported by BTS.

Supports retransmission

In packet service, the negative feedback is employed to control the retransmission, which means that the transmitter finds out the packets that are not received correctly by the receiver according to the bitmap fed back from the receiver, then determines if to retransmit the corresponding packet.

In GPRS, the packet data is retransmitted in original transmission coding mode, for example, the block transmitted in CS4 coding is retransmitted in CS4 mode.

In EDGE, there are two new retransmission methods: segmentation and reassembly, and incremental redundancy.

Optimization of packet channel allocation algorithm

ZXG10 iBSC supports the multiple time slot ability of the MS. It allocates GPRS TBF or EDGE TBF to the MS according to the different GPRS/EDGE availability of MS.

When ZXG10 iBSC allocates the PDTCH channel to the MS, it selects the carrier with lower load first; after selecting the carrier, it selects the most proper PDTCH channel combination in the carrier according to the MS requirement.

Supports satellite Abis and satellite Gb

There is a bi-directional time delay about 540 ms, which impacts the GRPS and EDGE services a lot. ZXB10 iBSC eliminates this impact as much as possible and ensures that the GPRS and EDGE services run normally.

Supports various interfaces

ZXG10 iBSC supports STM-1 interface, Fast Ethernet (FE) interface, and E1 interface.



Standards Complied

ZXG10 iBSC (V6.00) development standards are given below:

3GPP 23.060 General Packet Radio Service (GPRS) Service description Stage 2 (Release 5) version V5.10.0

3GPP 44.160 General Packet Radio Service (GPRS) Mobile Station (MS) Base Station System (BSS) interface Radio Link Control/Medium Access Control (RLC/MAC)protocol Iu mode(Release 5) version V5.8.0

3GPP 43.051 Radio Access Network Overall description Stage 2 (Release 5) version V5.10.0

3GPP 23.221 Technical Specification Group Services and System Aspects Architectural requirements(Release 5) version V5.11.0

3GPP 23.236 Intra-domain connection of Radio Access Network (RAN) nodes to multiple Core Network (CN) nodes (Release 5) version V5.3.0

3GPP 24.008 Mobile radio interface Layer 3 specification Core network protocols Stage 3(Release 5) V5.13.0

3GPP 25.323 Packet Data Convergence Protocol (PDCP) specification (Release 5) Version V5.4.0

3GPP 48.016 General Packet Radio Service (GPRS) Base Station System (BSS) Serving GPRS Support Node (SGSN) interface Network service Version V5.4.0

3GPP 48.018 General Packet Radio Service (GPRS) Base Station System (BSS) Serving GPRS Support Node (SGSN) BSS GPRS protocol (BSSGP) version V5.13.0

3GPP 44.018 - Mobile radio interface layer 3 specification Radio Resource Control (RRC) protocol (Release 5) version V5.20.0

3GPP 44.060 General Packet Radio Service (GPRS) Mobile Station (MS) Base Station System (BSS) interface Radio Link Control/Medium Access Control (RLC/MAC) protocol(Release 5) version V5.10.0

3GPP 44.118 Mobile radio interface layer 3 specification Radio Resource Control (RRC) protocol Iu Mode (Release 6) version V6.4.1

3GPP 44.008 Technical Specification Group GSM/EDGE Radio Access Network Radio subsystem link control (Release 5) version V5.19.0

3GPP 43.130 Iur-g interface Stage 2 version V5.0.0

3GPP 23.271 Functional stage 2 description of Location Services (LCS) version V5.13.0



3GPP 45.002 Multiplexing and multiple access on the radio path version V5.13.0

3GPP 43.059 Functional stage 2 description of Location Services (LCS) in GERAN version V5.5.0

3GPP 49.031 Location Services (LCS) Base Station System Application Part LCS Extension (BSSAP-LE) version V5.4.0

3GPP 48.071 - Location Services (LCS); Serving Mobile Location Centre - Base Station System (SMLC-BSS) interface; Layer 3 specification version V5.1.0

3GPP 44.031 - Location Services (LCS); Mobile Station (MS) - Serving Mobile Location Centre (SMLC) Radio Resource LCS Protocol (RRLP) version V5.13.0

3GPP 44.071 - Location Services (LCS); Mobile Radio Interface Layer 3 LCS Specification version V5.0.1

3GPP 48.008 Mobile Switching Centre Base Station System(MSC-BSS) interface Layer 3 specification(Release 5) version V5.12.0


C h a p t e r 2

System Indices

This chapter contains following topics:

Physical indices

Clock indices

Power indices

Environmental conditions

Reliability indices

Interface indices

Capacity indices

Physical Indices

Physical structure of ZXG10 iBSC (V6.00) is the same as ZXWR RNC. Structure of ZXG10 iBSC cabinet is shown in Figure 2.

Table 4 describes the size of ZXG1 iBSC (V6.00).

T AB L E 4 S I Z E AN D C O L O R O F ZXG10 I BSC (V6.00)

Dimensions and Color

Rack size

(Height x Width x Depth)

Single rack

2000 mm x 600 mm x 800 mm

Size



F I G U R E 2 PH Y S I C AL S T R U C T U R E O F ZXG10 I BSC (V6 .00)

Table 5 describes the weight of ZXG1 iBSC (V6.00) equipment and load bearing capacity of equipment room floor.

T AB L E 5 W E I G H T O F I BSC C AB I N E T AN D LO AD C AP AC I T Y O F R O O M FL O O R

Weight and Weight Bearing Requirements

Weight for single cabinet

350 kg

Weight for dual cabinet

700 kg

Clock Indices

ZXG10 iBSC clock indices are given in Table 6.

T AB L E 6 C L O C K I N D I C E S O F ZXG10 I BSC (V6.00)

Index Value

Clock level Level 3 A class clock

Minimum clock accuracy 4.6 10-6

Overall Weight

Chapter 2 System Indices


Index Value

Pull-in range 4.6 10-6

Maximum frequency deviation

210-8/day

Maximum initial frequency deviation

1 10-10

Clock working mode Fast pull-in, trace, hold, and free run

Clock synchronization mode

External clock synchronization, extract from line clock

2MBITS 2

2MHz 2

Clock synchronization interfaces Line 8k 2

Power Supply Indices

Table 7 describes the power supply ranges for ZXG10 iBSC (V6.00).

T AB L E 7 P O W E R S U P P L Y R AN G E

Power Supply Range

Voltage

-48 V DC

Voltage fluctuation range DC: - 40 V ~ - 57 V

Table 8 describes the power consumptions of ZXG10 iBSC (V6.00).

T AB L E 8 P O W E R C O N S U M P T I O N O F ZXG10 I BS C (V6 .00 )

Power Consumption

Power Supply Range

Power Consumptions

Index



Power Consumption

Power consumption of full configured single Cabinet

2200 W

Power consumption for full configuration dual Cabinet

5200 W

Environmental Conditions

The grounds of the ZXG10 iBSC (V6.00) system are -48 V ground, working ground, and protection ground. All grounds are connected with the rack via the bus bar and can be connected to the DC grounding pole via the rack.

Table 9 describes ZXG10 iBSC grounding requirements:

T AB L E 9 GR O U N D I N G R E Q U I R E M E N T S O F ZXG10 I BSC (V6 .00)

Requirement Range

Cabinet grounding resistance

0.1 ~ 0.3

Equipment room grounding resistance

< 1

Table 10 describes the temperature and humidity requirements.

T AB L E 10 TE M P E R AT U R E A N D H U M I D I T Y R E Q U I R E M E N T S F O R I BSC(V6 .00)

Requirement Range

Long-term operating temperature: 0 C ~ 40 C

Operating temperature

Short-term operating temperature: -5C ~ 45C

Relative humidity for long-term operation: 20% ~ 90%

Relative humidity

Relative humidity for short-term operation: 5% ~ 95%

Air inside the equipment room must be free of explosive, conductive, and corrosive gases that may corrode metallic parts

Grounding Requirements

Temperature and Humidity Requirements

Air Pollution Requirements



and degrade insulation. Table 11 describes the air pollution requirements of ZXG10 iBSC (V6.00).

T AB L E 11 AI R P O L U T I O N AN D AT M O S P H E R I C P R E S S U R E R E Q U I R E M E N T S

Requirement Range

Density of dust particles in the equipment room

Within the diameter of 5 m must be 3104 grains/m3

Atmospheric pressure requirement

70 kPa to 106 kPa

Reliability Indices

Reliability indices of ZXG10 iBSC (V6.00) are shown in Table 12.

T AB L E 12 RE L I AB I L I T Y I N D I C E S O F ZG10 I BSC (V6 .00 )

Index Value

Mean Time Between Failure (MTBF)

100,000 hours

Mean Time To Repair

30 min

System Restart Time



T AB L E 13 A- I N T E R F AC E I N D E X

Maximum Capacity

Index

Single Cabinet Dual Cabinet

E1 224 672

A-Interface

STM-1

4 12

GB-interface uses the following media:

1. E1 Link

2. FE Link

Table 14 describes the Gb-interface index for internal TC.

T AB L E 14 GB I N T E R F AC E I N D E X

Maximum Capacity

Index


A-interface E1

32 Mbps 96 Mbps

Gb-Interface

A- interface STM-1

32 Mbps 160 Mbps

Abis interface uses following media:

E1 Link

Fast Ethernet link

Table 15 describes the Abis-interface index.

Gb-Interface Index

Abis-Interface Index



T AB L E 15 AB I S I N T E R F AC E I N D E X O F IN T E R N AL I N D E X

Maximum Capacity

Index


E1

208 624

FE + E1 4 FE + 104 E1 12 FE + 312 E1

Abis Interface

FE 4 12

Capacity Indices

Table 16 describes the capacity index of ZXG10 iBSC (V6.00) configuration.

T AB L E 16 CAP AC I T Y I N D E X O F ZXG10 IBSC (V6.00 )

Index Maximum Capacity

E1 672

A-Interface

STM-1 12

E1 624

FE + E1 12 FE + 312 E1

Abis Interface

FE 12

A-interface E1 96 Mbps

Gb-Interface

A-interface STM-1 160 Mbps

64 kbit/s link 16 No. of No.7 link

2M No.7 link 2

No. of Carriers 3072

No. of Sites 1536

BHCA 4200K



Index Maximum Capacity

Traffic 15000Erlang


C h a p t e r 3

System Architecture

This chapter explains the following topics:

System composition

Hardware system

Shelf introduction

Board

Software system

System Composition

ZXG10 iBSC (V6.00) works smoothly in the GSM system and is compatible to all parts of GSM network. Position of ZXG10 iBSC (V6.00) with GSM system composition is shown in Figure 3.



F I G U R E 3 SY S T E M C O M P O S I T I O N

ZXG10 iBSC (1.0) communicates with BTS by Abis interface. A-interface is used for the communication between iBSC and MSC. Gb-interface connects the iBSC with SGSN.

Hardware System

ZXG10 iBSC (V6.00) uses peer solution when TC is internal, and uses large T network solution when TC is external. Figure 4 show the system diagram of ZXG10 iBSC (V6.00) having internal TC.

F I G U R E 4 ZXG10 I BSC (V6 .00 ) S Y S T E M D I AG R AM

ZXG10 iBSC

BTS

MSC

SGSN

ZTE

TCAccess Unit

Switching Unit

Processing Unit

TC Unit

O&M Unit

Power Fan

Monitroing Unit forAuxiliary Device

Overview

Chapter 3 System Architecture


Shelves

ZXG10 iBSC (V6.00) system includes three shelves: control shelf, resource shelf, and packet switching unit shelf. The functional description of each shelf is given in Table 17.

T AB L E 17 SH E L V E S D E S C R I P T I O N

Shelf Type Functions

Control Shelf

Implements the system global operation and maintenance, global clock function, control plane processing, and control plane Ethernet switching functions.

Resource Shelf

Implements the system access and form various common service processing sub-systems.

Packet Switching Unit Shelf

Provides non-blocking IP switching platform with large-capacity.

Refer to ZXG10 iBSC (V6.00) Base Station Controller Hardware Manual for details about shelves.

Boards

The boards configured in the shelves are classified into front board and back board according to the assembly relation. The front board and back board are inserted in the slot on the backplane. The indicators for board running status are installed on the front board panel. The back board assists the front board to lead out the external signal interface (the optical fiber is led out from front board panel) and debugging port to realize the connection between different shelves on the same rack, between different racks, and between the system and the external NE.

The description of the boards in ZXG10 iBSC (V6.00) is given in Table 18.



T AB L E 18 ZXG10 I BSC (V6 .00 ) BO AR D S L I S T

Board Name

Functions Board Function Name

Corresponding Back Board

BIPI

Provide FE interface for iBSC system, there are 4 FE interfaces on each BIPI.

IPBB,

IPAB,

IPGB

RMNIC

CHUB

CHUB and UIMC/UIMU together control the exchange and convergence of the system internal control plane data.

CHUB RCHB1,

RCHB2

CLKG Implement the clock function of iBSC system.

CLKG RCKG1,

RCKG2

CMP

Implement the service call control management in PS/CS domain, the resource management in sub-layer, such as BSSAP, BSSGP, and system itself.

CMP -

DTB Each DTB provides 32 E1 interfaces.

DTB RDTB

GLI

Provide interface and processing function for the interconnection of each resource shelf.

GLI -

GUP Realize the Abis interface processing, transcoding and rate adaptation.

BIPB

DRTB -

OMP

Implement the system global processing, provide an external FE interface and iOMCR connection; monitor and manage the boards in the system directly or indirectly.

OMP RMPB

PSN Implement the exchange of user plane data with large capacity.

PSN -

SDTB Provide a standard 155M STM-1 interface.

SDTB RGIM1

SPB Implement the signal processing and external interface function.

SPB,

GIPB,

LAPD

RSPB

SVR

Store some files needed by OMP, and organize these files according to the requirement of OMC.

SVR RSVB



Board Name

Functions Board Function Name

Corresponding Back Board

UIMC

Provide switching plane for control shelf and packet switching unit shelf.

UIMC RUIM2,

RUIM3

UIMU Provide internal platform for resource shelf.

UIMU RUIM1

UPPB

Implement the PS service processing in A/Gb mode and user plane service processing in Iu mode.

UPPB -

Note:

Each board has two names: board hardware name and board function name. The board hardware name is the board name, and board function name reflects the function that the board implements after loading the software. The same hardware board can realize a different function by loading different software.

Refer to ZXG10 iBSC (V6.00) Base Station Controller Hardware Manual for details on boards.

Software System

The software system of ZXG10 iBSC (V6.00) includes foreground software and background software. The foreground software runs on ZXG10 iBSC equipment, and the background software runs on the NM server and client.

The software structure of ZXG10 iBSC is shown in Figure 5.

F I G U R E 5 - ZXG10 I BSC S O F T W AR E S T R U C T U R E

iBSC

TCP/IP

iBSC Equipment

ForegroundSoftware

BackgroundSoftware

Background NM



Foreground Software

The foreground software system structure of ZXG10 iBSC (V6.00) is shown in Figure 6.

F I G U R E 6 FO R E G R O U N D SO F T W AR E S Y S T E M S T R U C T U R E

HARDWARE

BSP&DRIVER

SCS

DBS

OMS

RANRANC

BRSOSS

VxWorks

RAN

RANSS

RANRANUSCS DBS OMS

SignalingSubsystem

RANC RANSSRANU

BRSOSS

Description of the main parts of software system is as follows:

BSP subsystem implements the hardware drivers of the whole system. It shields the upper level software module from the operation details of hardware device, extracts the hardware function and only provides the logic function level of the hardware device to the other software module.

OSS subsystem works above the BSP subsystem and below all other subsystems, it shields the user process from all device driver interfaces. The main tasks of OSS include process communication, file management, device driver and process scheduling.

Database subsystem works above the OSS subsystem. It manages the physical resources of NE, manages the configuration information of services, signaling and protocol, and provides the database access interface to other subsystems.

The bearer subsystem provides the bearer services of IP and TDM to the service support subsystem, signaling subsystem and OMS, and implements LAPD function and Frame Relay (FR) function.

Operation and maintenance subsystem is a foreground realization of OMCR and LMT. It performs following functions:

Performance management

BSP Subsystem

OSS Subsystem

Database Subsystem

Bearer Subsystem

Operation and Maintenance

Subsystem



Signal tracing

Performance statistic of radio service

Service alarm, and dynamic observation of service data

SCS works above the OSS and DBS. It performs the monitoring, startup, and version download of the whole system.

Signaling subsystem works above OSS, DBS, and bearer subsystem. It realizes the narrow band No. 7 signaling, broadband No. 7 signaling, calling signaling, IP signaling and gateway control signaling, and it provides services to RANC and RANSS.

RAN control plane subsystem performs the following functions:

Implements processing of layer 3 control plane protocols at Um, Abis, A, and Gb interface.

Implements function of calling signaling connection control, including; radio resource management, dynamic channel resource adjustment, load control, acceptance control, handover, and signaling connection management.

RAN user plane subsystem performs the following functions:

For the PS in A/Gb mode and Iu mode, it provides data forwarding and scheduling at radio interface, Gb interface, and Iu interface according to the QoS demand.

For CS in A/Gb mode, it provides the TC function on GUP board.

RAN service supporting subsystem provides support to control plane and user plane subsystem and performs the following functions:

Guarantees the proper process of service.

Provides monitoring of various services.

Implements BSC global processing, including signaling tracing, load control, acceptance control, and performance measurement.

Background Software

Background software runs on the NM server and client, it is called ZXG10 NetNumen-G and it communicates with iBSC by TCP/IP protocol. The main functions of ZXG10 NetNumen-G are as follows:

Configuration management

Fault management

Performance management

System management

SCS

Signaling Subsystem

RAN Control Plane

Subsystem

RAN User Plane

Subsystem

RAN Service Supporting Subsystem


C h a p t e r 4

Interfaces and Protocols

This chapter describes the following topics:

A interface

Gb interface

Abis interface

Main protocol model protocols

User plane stack protocol in PS domain

Control plane stack protocol in PS domain

User plane stack protocol in CS domain

Control plane stack protocol in CS domain

Abis interface protocols

External Interfaces The external interfaces of ZXG10 iBSC (V6.00) are shown in Figure 7.

F I G U R E 7 EX T E R N AL I N T E R F AC E S O F ZXG10 I BSC

MSC

BTS

iBSC

SGSN

A Gb

Abis

MSC

A

BTS iOMCR

Abis

AInterface

AbisInterface

AbisInterface

AInterface

GbInterface

Foreground/BackgroundInterface



The functional description of ZXG10 iBSC external interfaces is given in Table 19.

T AB L E 19 FU N C T I O N AL D E S C R I P T I O N O F ZXG10 I BSC E X T E R N AL I N T E R F AC E S

External System

External System Function

Relative Interfaces

BTS Establish the radio environment under the control of iBSC.

Abis interface, providing the control and maintenance information of BTS, and providing the transmission of voice information and GPRS data at Abis interface.

MSC

Control iBSC and MS to establish voice radio channel, implement the function of voice exchange.

A interface, providing relative message about connection establishment and deleting at A interface, forwarding the higher-level message between MS and MSC transparently, and also transmitting voice information.

SGSN

Control iBSC and MS to establish the GPRS radio channel, and implement the function of data information exchange.

Gb interface, providing relative message about connection establishment and deleting at Gb interface, forwarding the higher-level message between MS and MSC transparently, and also transmitting GPRS data information.

OMC The system operators maintain and control the iBSC by OMC.

Foreground/Background interface, providing the control and maintenance to iBSC for OMC.

A-Interface

The interface between BSC and MSC is called A interface. More accurately, A interface is the interface between TC and MSC.

Transcoder implements the voice transformation between voice coding and 64 kbps A law PCM coding. At the same time, it performs the data rate adaptation in the circuit data service. TC can be either at BSC side or MSC side.

The iBSC A interface supports three kinds of interfaces.

In this case, iBSC is connected with MSC by 75 coaxial cable or 120 twisted pair.

At A interface, data link layer employs MTP2 protocol, network layer employs MTP3 and SCCP protocol, and application layer employs BSSMAP protocol.

E1 Interface

Chapter 4 Interface and Protocols


In this case, iBSC is connected with MSC by optical fiber.

In this case, iBSC is connected with MSC by network cable.

iBSC implements IP-related protocol, SCTP protocol and M3UA protocol.

Abis Interface

The interface between BSC and BTS is called Abis interface. BSC is connected with BTS via Abis interface. Abis interface is the internal user-defined interface of ZXG10 iBSC. When using E1 for transmission, Abis interface supports various networking modes such as star, chain, tree, and ring.

The Abis interface of iBSC supports two kinds of interfaces.

If the Abis interface is an E1 interface, iBSC is connected with BTS by 75 coaxial cable or 120 twisted pair.

At Abis interface, data link layer employs LAPD protocol, and the upper layer employs application protocol such as RR.

In this case, iBSC is connected with BTS by network cable.

Date link layer employs RUDP protocol.

Gb Interface

The interface between BSC and SGSN is called Gb interface. BSC is connected to SGSN via Gb interface.

Gb interface supports two kinds of interfaces.

iBSC is connected with SGSN by E1 line, the data access rate could be N 64 kbps (1 N 32). The time slot and bandwidth used on E1 line is appointed by the operator.

At Gb interface, iBSC realizes FR protocol, NS protocol and BSSGP protocol.

In this case, iBSC and SGSN is connected by network cable.

iBSC implements IP-related protocol, NS protocol and BSSGP protocol.

Foreground/Background Interface

The foreground/background interface is the interface connecting ZXG10 iBSC background NM and iBSC foreground device. The background NM software cannot manage and configure the iBSC

STM-1 Interface

FE Interface

E1 Interface

FE Interface

E1 Interface

FE Interface



foreground board without this interface. The foreground communicates with the background through TCP/IP protocol.

The background computer on which the ZXG10 iBSC NM software runs is connected with the OMP and SVR board of iBSC via 100 Mbps Fast Ethernet interface.

Protocols Protocols in CS domain

CS domain stack protocol is used to process the protocol related to voice data of each layer.

User Plane Stack Protocol in CS Domain

Figure 8 shows the user plane stack protocol in CS domain.

F I G U R E 8 US E R P L AN E S T AC K P R O T O C O L I N CS D O M A I N

G.711/TFO

AUm

MS

Relay

GERAN 2G-MSC

L1L1PHY

AMR/FR/EFR/HR

PHY

Transcoding /TRAU RelayRLPRLP

AMR/FR/EFR/HR coding can be used for transmitting voice service and RLP protocol can be used for transmitting data service.

Control Plane Stack Protocol in CS Domain

Figure 9 shows the control plane stack protocol in CS domain.



F I G U R E 9 CO N T R O L P L AN E S T AC K P R O T O C O L I N CS D O M AI N

CM

MM

RR

LapDm

MS

RR

LapDm

Um

LapD

BTSM

LapD

Abis

RRBTSM SCCP

MTP3

BSSAP

BTS iBSC

MTP2

SCCP

MTP3

BSSAP

MTP2

CM

MM

MSC

A

RUDP RUDP

PhysicalLayer

The protocol layers of control plane in CS domain at UM interface are shown in Figure 10.

F I G U R E 10 C I R C U I T S E R V I C E P R O T O C O L S T R U C T U R E AT UM I N T E R F AC E

CM

MM

RR

LAPDm

Layer1 Layer1

LAPDm

RR

MS BTS

UmUmInterface

Transmission Layer (Physical Layer)

The first layer of UM interface. It provides the transmission channel of the radio link, transmits the data by radio wave, and provides channels with different functions for the upper layers, including service channel and logic channel.

Data Link Layer

The second layer of Um interface. It provides reliable data link between MS and BTS, employs LAPDm protocol that is the dedicated protocol for GSM and the transformed version of the ISDN D channel protocol LAPD.

Application Layer

The third layer of Um interface. It processes control and management protocol, arranges the control process information of the user and the system to the appointed logic channels according to certain protocol group. It includes three sub-layers: CM, MM and RR.

Um Interface



f CM Layer

It implements the communication management: establishes connection between users, holds and releases the calls, which can be divided into CC, SSM and SMS.

f MM Layer

It realizes mobility and security management and the processing done by MS when it initiates location update.

f RR Layer

It manages radio resources and establishes and releases the connection between MS and MSC during the call.

In iBSC this interface can transmit data in two ways: E1 and IP

The protocol layers of the control plane stack protocol at Abis interface in CS domain are shown in Figure 11.

F I G U R E 11 H I E R AR C H I C A L S T R U C T U R E O F C O N T R O L P L AN E P R O T O C O L AT AB I S I N T E R F AC E

Abis

BTS

BTSM

LAPD

Layer1

iBSC

Layer1

RUDP

BTSM

RR

RUDP LAPD

AbisInterface

Layer1 Physical Layer

It could employ 2 Mbps E1 cable or Cat-5 network cable.

Layer2 Data Link Layer

f When Abis interface employs E1 for transmission, the data link layer employs LAPD protocol, which is a one to many communication protocol and a subset of Q.921 standard, LAPD is frame structure, including flag field, control field, information field, check field, and flag sequence. The flag field includes SAPI and TEI, which indicate the accessed service and entity.

f When Abis interface employs IP for transmission, data link layer employs RUDP protocol.

Layer3 Application Layer

It transmits the application part of BTS, including radio link management function and operation & maintenance function.

Abis Interface



The layers of control plane protocol in CS domain at A interface are shown in Figure 12.

F I G U R E 12 H I E R AR C H I C A L S T R U C T U R E O F C O N T R O L P L AN E P R O T O C O L I N CS D O M AI N A T A I N T E R F AC E

BSC

MTP3

MTP2

Layer1MSC

A

Layer1

MTP2

MTP3

RR

SCCP

SCCP

BSSAP

BSSAP

MM

CM

AInterface

Layer1 Physical Layer

f It defines the physical layer structure of MSC and BSC, including physical and electrical parameters and channel structure.

f It employs the first level of MTP in SS7 to realize, and uses 2 Mbps PCM digital link as transmission link.

Layer2 Data Link Layer and Network Layer

f MTP2 is a varied version of HDLC protocol. The frame structure includes flag field, control field, information field, check field and flag sequence.

f MTP3 and SCCP implements functions such as signaling route selection.

Layer3 Application Layer

f It includes BSS application rules and BSSAP.

f It maintains and manages the resource and connection of BTS subsystem, controls the service connection and release.

Protocols in PS Domain

PS domain stack protocol is used to process the protocol of each layer related with packet data.

A Interface



User Plane Stack Protocol in PS Domain

Figure 13 shows the user plane stack protocol in PS domain.

F I G U R E 13 U S E R P L AN E S T AC K P R O T O C O L I N PS D O M AI N

Figure 14 shows the protocol layer at Um interface.

F I G U R E 14 - H I E R AR C H I C AL S T R U C T U R E O F PS P R O T O C O L AT U M I N T E R F AC E

MS

Um

BSS

RLC

MAC

relay

RLC

MAC

LLC

SNDCP

PHYPHY

Um Interface

GSM RF

The physical layer of Um interface is the RF interface part. The RF part employs the same transmission mode as GSM circuit service, specifying carrier characteristics, channel structure, modulization mode and RF index and so on.

RLC is the radio link control protocol of the air interface between BTS and MS. The main functions are error detection of data block, retransmission selection and confirmation of error data block at Um interface and so on.

Um Interface

RLC/MAC Layer



MAC controls the access signaling flow on radio channel. It makes decision when a great deal of MSs access the common media, and also it maps the LLC to the GSM physical channel.

Compared with the MAC function in A/Gb mode, the MAC of GERAN has the following important differences:

f Supports one MAC entity with many TBF

f Support MAC layer encryption

LLC is a radio link protocol based on HDLC, which can provide highly reliable encrypted logical link. LLC layer generates LLC address and frame filed from the SDDC data unit of upper layer SNDC layer for generating complete LLC frame. In addition, LLC can realize the one to many addressing and the retransmission control of data frame. LLC is independent from the bottom layer radio interface protocol for the least modification of NSS when introducing the other optional GPRS radio resolution. GSM04.64 standardizes LLC.

As the transition between network layer and data link layer, the main function of SNCDP is to packet the transmitted data and sent it to the LLC layer for transmission to find out the TCP/IP address and encryption method.

In SNDC layer, the transmitted data between MS and SGSN is divided into one or more SNDC data packet units. SNDC data packet unit is put into LLC frame after being generated.

Relay forwards the LLC PDU between Um and Gb interface.

Physical and Transmission Layer employs 2 Mbps E1 cable or cat-5 network cable.

Network service is based on frame relay, and it is used to transmit the upper layer BSSGP PDU.

In transmission platform, this protocol provides connectionless link to transmit data without confirmation between BSS and SGSN.

It is the internet protocol defined in RFC 791, which is used for routing user data and control signaling. When it employs FE for transmission between iBSC and SGSN, the data link layer at Gb interface uses IP protocol.

Frame relay provides permanent virtual circuit, which transmits the user data and signaling at Gb data. When it employs E1 for transmission between iBSC and SGSN, the data link layer at Gb interface uses FR protocol.

Control Plane Stack Protocol in PS Domain

Figure 15 shows the control plane stack protocol in PS domain.

LLC Layer

SNDCP

Relay

Layer1

Network Service

BSSGP

IP

FR



F I G U R E 15 C O N T R O L PL AN E S T AC K P R O T O C O L I N PS D O M AI N

GMM/SM implements GPRS mobility management and session management protocol processing, such as attach/detach, security management, route area update, location area update, and PDP context activation/deactivation.

For the details of the other layers, refer to User Plane Stack Protocol in PS Domain.


C h a p t e r 5

Data Flow Direction

This chapter explains the following topics:

System clock signal flow

User plane data flow

Control plane data flow

System clock Signal Flow

Figure 16 shows the system clock signal flow of ZXG10 iBSC (V6.00).

F I G U R E 16 S Y S T E M C L O C K S I G N AL FL O W



CLKG is responsible for following two functions:

1. CLKG board in the control unit of ZXG10 iBSC (V6.00) is responsible for providing the clock signals to other parts.

2. CLKG takes clock signal from 8K BITS interface line. CLKG provides separate clock signals to resource unit and packet switching unit. It provides 8K clock to resource unit by the UIMU and packet switching unit through UIMC.

User Plane Data Flow

User plane data flow is divided in to following two parts:

1. User plane data flow in CS domain

2. User plane data flow in PS domain

Figure 17 shows the user plane data flow in CS domain.

F I G U R E 17 U S E R P L AN E D AT A FL O W I N CS D O M AI N

BIU

Abis AIU

A

PCUGb

CMP OMP

UPPB TCU

1

2

AbisInterface

AInterface

GbInterface

User PlaneSwitching Network

Control PlaneSwitching Network

Taking uplink direction as an example, the downlink direction is opposite.

BIU detaches the user plane data and control plane data, sends the user plane data to TCU for processing. After the processing of TCU, the data is sent to AIU. The flow direction is 12. Figure 18 shows the user plane data flow in PS domain.

User Plane Data Flow in

CS Domain

User Plane Data Flow in

PS Domain

Chapter 5 Date Flow Direction


F I G U R E 18 U S E R P L AN E D AT A FL O W I N PS D O M AI N

BIU

Abis AIU

A

PCUGb

1

CMP OMP

UPPB TCU

2Abis

Interface

AInterface

GbInterface



Taking uplink direction as an example, the downlink direction is opposite.

The PCU frame detached by BIU interface is sent to UPPB via user plane switching network and then the user data in PS domain is detached by UPPB for processing. After that, the data is sent to PCU via user plane switching network. The flow direction is 12.

Control Plane Data Flow

Control plane data flow is divided in to following two parts:

1. Control plane data flow in CS domain

2. Control plane data flow in PS domain

Figure 19 shows the control plane data flow in CS domain:

F I G U R E 19 C O N T R O L PL AN E D AT A FL O W I N CS D O M A I N

BIU

Abis AIU

A

PCUGb

1

2

CMP OMP

3

UPPB TCU

AbisInterface

AInterface

GbInterface



The description of diagram is as follows:

Control Plane Data Flow in

CS Domain



Abis interface signaling flow

f BIU separate the user plane data and control plane signaling data.

f BIU sends the control plane signaling data to CMP through the LAPD channel via the control switching network.

f CMP process the control signaling data and send part of it back to the BIU directly, the data flow direction is 11.

f The other part of signaling generates A interface signaling flow, which is sent to AIU. The flow direction is 12.

A interface signaling flow

f A-interface unit (AIU) performs the MTP2 processing and sends the control plane signaling data to the CMP for MTP3 processing via control plane switching network.

f CMP perform the MTP3 processing and also send some data to the OMP for processing.

f OMP send the process result to CMP. CMP send all the processed data to the AIU via the control plane switching network.

f Alternatively the control plane data flow direction can be from AIU to the CMP via the control plane switching network and vice versa.

f The data flow direction is 2 3 3 2 or 2 2. Figure 20 shows the control plane data flow in PS domain.

F I G U R E 20 C O N T R O L PL AN E D AT A FL O W I N PS D O M A I N

BIU

Abis AIU

A

PCUGb

1

4

CMP OMP

6

UPPB TCU

2

35

AbisInterface



AInterface

GbInterface

The description of diagram is as follows:

Abis signaling flow

f BIU sends the control plane signaling data to the CMP for processing. CMP process and send back some immediate

Control Plane Data Flow in

PS Domain

Chapter 5 Date Flow Direction


data (like immediate assignments) to BIU. The data flow direction is 1 1.

f Control data of some users containing more assignments need to be sent to user plane/PCU processing unit via the control plane switching network. User plane/PCU processing unit process this data and send back to CMP. CMP transfer this data to BIU through the control plane switching network. The data flow direction is 1 3 3 1.

f By LAPD board of Abis interface unit send user data (PACCH uplink channel request) to the user plane/PCU processing unit via the user plane switching network. Use plane/PCU processing unit send the control signaling data to CMP for processing. CMP process it and send back to user plane /PCU processing unit. At the end the user plane processing unit transfers back the processed data by user plane switching network to the BIU. The data flow direction is 2 3 3 2.

Gb signaling flow

PCU sends the control data to the corresponding board for processing, including CMP, OMP and UPPB. After the processing is finished, the data is sent to Gb interface via PCU, the data flow direction is 4 4, 5 5 or 6 6.


C h a p t e r 6

Networking Modes and System Configuration

This chapter contains the following topics:

Abis interface networking modes

A interface networking modes

Gb interface networking modes

Operation and maintenance system networking

TC internal rack configuration

Shelf configuration of RCBU shelf

Control shelf configuration

Packet switching shelf configuration

Networking Modes There are interfaces on iBSC for OMC, BTS, MSC and SGSN. ZXG10 iBSC provides various networking modes at each interface. In actual practice, select the networking mode according to the environment flexibly. The following topics describes various networking modes supported by ZXG10 iBSC according to the four interfaces respectively.

Abis Interface Networking Modes

ZXG10 iBSC (V6.00) supports all series of ZXG10-BTS models and can configure corresponding BTS networking modes including star, chain, tree, and ring types. In practice, these modes are used in combination to achieve the best price-performance ratio.



Using E1 for Transmission

The configuration of star networking is shown in Figure 21.

F I G U R E 21 AB I S I N T E R F AC E S T AR N E T W O R K I N G

iBSC

SITE0

SITE1

SITEn

.

.

.

Each site is directly connected to BSC in a star network. The networking mode is simple, links are reliable, and maintenance and construction is convenient. This mode is applicable in a densely populated region.

The configuration of chain networking is shown in Figure 22.

F I G U R E 22 AB I S I N T E R F AC E C H AI N -N E T W O R K I N G

SITE0iBSC SITE1 SITE2

A chain network uses less transmission equipment as the sites are connected using the by-pass or straight through function. If a shallow depth BTS encounters any broken link, the cascaded BTS with deeper depth can be directly connected without affecting normal operation. This mode is applicable in regions with strip-shaped population distribution.

The configuration of tree networking is shown in Figure 23.

Star Networking

Chain Networking

Tree Networking

Chapter 6 Networking Modes and System Configuration


F I G U R E 23 AB I S I N T E R F AC E TR E E N E T W O R K I N G

iBSC

SITE0

S IT E 1

S IT E 2

S IT E n

.

.

.

Tree networking mode is more complex and signal passes through more nodes with low link reliability. Any fault in upper level site may affect the normal operation of a lower level site. This mode is applicable for large areas with sparse population but not frequently applied.

The configuration of ring networking is shown in Figure 24.

F I G U R E 24 AB I S I N T E R F AC E R I N G N E T W O R K I N G

iBSC

SITE0

SITE2

SITE1

SITE3

Ring networking is the most useful and advanced networking mode in GSM communication structure. If any of site links is broken, the communication starts from the opposite way. This enhances the system performance and reliability. Due to ring

Ring Networking



networking mode the inter-site and iBSC communication becomes almost uninterruptible.

Using IP for Transmission

When use IP for transmission, the BTS accessing iBSC include macro cell BTS and micro cell BTS.

The typical application scenario of iBSC IP Abis is shown in Figure 25.

F I G U R E 25 ZXG10 I BSC TY P I C AL IP AB I S AC C S E S S

MS

ADSL MODEM

ADSL MODEM

MSxDSL

MS

MS

MS

MS

Site1

Site2

MS

iBSCIP

ZTE

INTERNET

Intranet

Micro Cell BTS

Macro Cell BTS

Micro Cell BTS

Micro Cell BTS

Micro Cell BTS

Micro Cell BTS

IP DedicatedCable

IntranetEnterprise Network

Internet PublicNetwork

xDSL Access Device

Generally, macro cell BTS access iBSC directly by IP dedicated cable.

Micro cell BTS access iBSC in many ways, including:

f Access via internet from family by ADSL.

f Access the internet via enterprise gateway by deploying the BTS inside the enterprise.

f Access the iBSC via the IP dedicated cable of macro cell BTS.



A Interface Networking Modes

Figure 26 shows the two ZXG10 iBSC (V6.00) A interface networking modes when using E1 for transmission.

F I G U R E 26 ZXG10- I BSC (V 6 .00 ) A I N T E R F AC E S Y S T E M N E T W O R K I N G

iBSC TC

A

MSC

A Interface

Gb Interface Networking Modes

E1 and Fast Ethernet based frame relay protocol is used to implement Gb interface function between ZXG10 iBSC (V6.00) and SGSN. The Gb interface networking mode includes crossover and BSC cascade modes. Figure 27 shows the Gb interface crossover and BSC cascade networking modes.

F I G U R E 27 ZXG10- I BSC (V 1 .0 ) GB I N T E R F AC E S Y S T E M N E T W O R K I N G

Multiple iBSCs can be cascaded and then connected to SGSN to save Gb interface line resources if bandwidth permits. The iBSC cascade mode is very convenient. For example, iBSC1 is directly connected to SGSN. iBSC2 can be directly connected to the other PCM ports of DTB via E1. A transparent transmission from iBSC2 to SGSN can be implemented via configuration, saving resource with no need for an E1 between iBSC2 and SGSN.



Operation and Maintenance System Networking

ZXG10 iBSC (V6.00) supports two types of maintenance:

1. Local maintenance

2. Remote maintenance

Local maintenance implies that BSC and OMCR are interconnected via LAN. The simplest and most common mode is the local maintenance mode. In this mode, the iBSC and OMCR are located on the same LAN and connected via Ethernet. The OMCR server is directly connected to the BSCs that it manages via LAN. The BSCs managed by OMCR need to be physically present in the same location. Figure 28 shows local maintenance networking.

F I G U R E 28 ZXG10- I BSC (V6 .00 ) LO C AL M AI N T E N A N C E N E T W O R K I N G

iBSC 1iBSC 2

LAN

1 2Server Client 1 Client 2

Remote maintenance implies that BSC and OMCR are connected via PCM, X.25, Defense Data Network (DDN) or other modes.

In the PCM networking mode for remote maintenance, the 2 Mbps PCM link available between MSC and the BSC or other dedicated PCM links, can be used to transmit NM information. In this mode, the timeslot in PCM link is borrowed to transmit OMCR information at a rate of n x 64 kbps (n is the number of occupied timeslots). PCM equipment is used to extract a certain number of timeslots from the PCM links that are then used by the OMCR. This approach is economical, practical, and fully utilizes available resources. Figure 29 shows the PCM networking mode for remote maintenance.

Local Maintenance

Remote Maintenance



F I G U R E 29 ZXG10- I BSC (V6 .00 ) R E M O T E PCM M O D E N E T W O R K I N G

iOMCR-R Server

The router + baseband Modem scheme is applied to X.25 and DDN networking for remote maintenance. This implies that MP at the BSC end is accessed via an Ethernet interface to the router that is connected with leased line via the baseband modem. At OMCR, leased line is accessed via an Ethernet interface with the same method. Figure 30 and Figure 31 show the X.25 and DDN leased line remote networking schemes respectively.



F I G U R E 30 ZXG10- I BSC (V6 .00 ) R E M O T E X .25 M O D E N E T W O R K I N G

iOMCR-R Server

F I G U R E 31 ZXG10- I BSC (V6 .00 ) R E M O T E DDN M O D E N E T W O R K I N G

Router

Router

Remote BSCn

Client 1

LAN

OMC-R server Client 1 Client 2

Local BSC1

Local BSCn

LAN

DDN

Base band MODEM

Base band MODEM

iOMCR-R Server

iBSC1

iBSCn

iBSCn



System Configuration In ZXG10 iBSC system, two resource shelves form a Resources Board Configuration Basal Unit (RCBU). It only needs to add RCBU for capacity expansion.

Cabinet Configuration

ZXG10 iBSC supports single cabinet configuration and dual cabinet configuration.

In case of single cabinet configuration, the position of each shelf in the cabinet is shown in Figure 32.

F I G U R E 32 S I N G L E C AB I N E T C O N F I G U R AT I O N

1

4

3

2

Layer 1

Layer 2

Layer 3

Layer 4

ResourceShelf

ControlShelf

ResourceShelf

PacketSwitching Shelf

The description of single cabinet configuration is given in Table 20.

T AB L E 20 S I N G L E C AB I N E T C O N F I G U R AT I O N D E S C R I P T I O N

Shelf Name If Necessary Position in the Cabinet

Control Shelf Necessary Position fixed, layer 2

Packet Switching Shelf

Necessary Position fixed, layer 4

Resource Shelf

Configure one layer or two layers according to requirements.

Either layer 1 or layer 3

Single Cabinet Configuration



Fully configured single cabinet capacity description is given in Table 21.

T AB L E 21 S I N G L E C AB I N E T C AP AC I T Y D E S C R I P T I O N

Parameter Name Value

Supported carrier No. 1024

Flow at Gb interface 32

E1 208 Abis interface capacity FE + E1 104 E1+ 4 FE

A interface E1/STM-1 224/4

E1 6792 A interface TC resource STM-1 7812

In case of dual cabinet configuration, the position of each shelf in the cabinet is shown in Figure 33.

F I G U R E 33 D U AL C AB I N E T C O N F I G U R AT I O N

1

1 2

4

3

2

ResourceShelf

ResourceShelf

ResourceShelf

ResourceShelf

ResourceShelf

ResourceShelf

ControlShelf

PacketSwitching Shelf

Layer 1

Layer 2

Layer 3

Layer 4

Cabinet 1(MasterCabinet) Cabinet 2

The dual cabinet configuration description is given in Table 22.

T AB L E 22 DU AL C AB I N E T C O N F I G U R AT I O N D E S C R I P T I O N

Shelf Name

If Necessary

Position in the Cabinet

Control Shelf

Necessary Position fixed, at cabinet 1 shelf 2


Necessary Position fixed, at cabinet 1 shelf 4

Resource Configure In cabinet 1 it is in the first layer and

Dual Cabinet Configuration



Shelf Name

If Necessary

Position in the Cabinet

Shelf depending on requirements.

the third layer; in cabinet 2, it could be in any layer.

Fully configured dual cabinet capacity description is given in Table 23.

T AB L E 23 DU AL C AB I N E T C AP AC I T Y D E S C R I P T I O N

Parameter Name Value

Supported carrier No. 3072

Use E1 for transmission at A interface

96

Flow at Gb Interface (Mbps) Use STM-1 for

transmission at A interface

160

E1 624 Abis Interface Capacity FE + E1 312 E1+ 12 FE

A Interface E1/STM-1 672/12

E1 20376 A Interface TC Resource STM-1 23436

Shelf Configuration

Packet switching configuration is shown in Figure 34.

F I G U R E 34 P AC K E T S W I T C H I N G C O N F I G U R AT I O N

RUIM2

RUI

M3

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

GLI

GLI

GLI

GLI

PSN

PSN

UIMC

UI

MC

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

BPSN


BPSN

Back BoardFront Board

Packet Switching

Shelf Configuration



The description of packet switching shelf configuration is shown in Table 24.

T AB L E 24 PAC K E T S W I T C H I N G S H E L F CO N F I G U R AT I O N D E S C R I P T I O N

Board Name UIMC PSN GLI

Quantity 2 2 2~8

Remark Necessary Necessary Configure according to requirements

Corresponding Back board

RUIM2/RUIM3 - -

UIMC implements the control plane switching function of packet switching shelf. It is inserted in slot 15 and slot 16 fixedly and it is necessary to configure. The corresponding back board is RUIM2/RUIM3, which are also necessary. RUIM2 and RUIM3 are fixedly inserted into slot 15 and 16 respectively.

PSN implements the data switching between line cards

GLI implements GE line card function. It could be inserted in slot 1~6 or slot 9~14, the quantity can be selected according to configuration capacity and must appear in pair. The configuration order principle is increasing from left to right.

The control shelf configuration is shown in Figure 35.

F I G U R E 35 C O N T R O L S H E L F C O N F I G U R AT

zxg10 ibsc (v6[1].00) board

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