g-lii 202 planning for radio coverage capacity-20080312-a-2.1

8/13/2019 G-LII 202 Planning for Radio Coverage Capacity-20080312-A-2.1

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HUAWEI TECHNOLOGIES CO., LTD.

www.huawei.com

HUAWEI Confidential

Security Level:

Planning for Radio

Coverage Capacity

Wireless Case & Training DepartmentISSUE 2.1


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HUAWEI TECHNOLOGIES CO., LTD. HUAWEI Confidential Page 3

Planning for coverage and capacity

Principles of selecting combiner-divider

Technology of improving coverage

Estimation of capacity

After learning this course, you should be

familiar with:

Purpose


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Contents

Chapter 1 Radio Network Planning

Chapter 2 Radio Coverage Planning

Chapter 3 Radio Capacity Planning


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Radio Network Planning

The radio network planning consists of coverage planning and

capacity planning that are interactional.

Output

Single-BTS

capacity

Output

Single-BTS

configuration

Input

Subscriber

number/traffic

model

Input

Coverage

acreage/communica

tion probability

Capacity

planning

Coverageplanning

Output

Network

capacity

Output

BTS quantity


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Radio Network Planning

New-constructed

network

Reconstruction network

expanded network

Swapped network

Category of radio network:

Different networks require different input information and focuses.


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Contents





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Basic Knowledge of Radio Coverage

Basic knowledge of radio coverage:

Balance of uplink and downlink Communication probability

Propagation model

Forecast for coverage distance


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Antenna

TTA

Antennastand

Jumper betweenantenna and TTA

Jumper betweenTTA and feeder

Feeder

Lighteningarrester

Jumper betweenlightening arresterand cabinet

BTS312

cabinet

SWITCH BOX

FAN BOX

AIR BOX

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Balance of Uplink and Downlink

Why the balance of uplink and downlink is

required?

What are the factors that may affect the

balance of uplink and downlink?


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Communication ProbabilityConcept of communication probability: Success call rate of MS on the

radio coverage border or in the cellCategory of communication probability: location probability and time

probability

In general, the time change has little impact on the communication probability,

so it can be neglected.

System Margin

Probability

Distribution


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HUAWEI TECHNOLOGIES CO., LTD. HUAWEI Confidential

Propagation Model

Propagation model of free space (Lp=32.4+20logf+20logd)

Okumura-Hata model (Applying to forecast of 900M macro cell)

COST231-Hata model (Applying to forecast of 1800M macro cell)

COST231 Walfish Ikegami model (Applying to forecast of 900M and

1800M micro cells)

Indoor propagation model (Keenan-Motley, applying to 900M and

1800M cells)

Common propagation model


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Forecast of Coverage Distance

Principles

1. According to the communicationprobability, obtain the receiving

level median.

2. According to the balance of

uplink and downlink, estimatethe maximum path loss.

3. According to the features of

environment, confirm the

propagation model.

4. Forecast the coverage distance

of cell.


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Forecast of Coverage Distance


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Forecast of Coverage DistanceCase

To construct a 900MHz Network in the suburb that requires about

100 square kilometer coverage acreage, -94dBm minimum

receiving level, and 91% border coverage probability, forecast the

coverage distance and calculate the required quantity of BTSs.

Useful input information

Band: 900MHz

Network environment: suburb

Coverage acreage: 100km2

Efficient receiving level: -94dBm

Border coverage probability: 91


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Forecast of Coverage DistanceFrequency

Environment

Probability

Level

Required BTS

quantity

Coverage

acreage

Coverage

radius


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Question

What parameters are required in the

coverage planning?

How to select coverage schemeaccording to coverage requirements?


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Contents





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Contents

Section 1 Basic Knowledge of Capacity

Planning Section 2 Capacity Planning

Section 3 Location Area Planning

Section 4 Expanding Network Capacity


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Basic Knowledge of Capacity PlanningFor the capacity planning, you need to know about the

following basic concepts:

Traffic

Call exchange volume of a subscriber in a particular

time

Another name: traffic load ; Unit: Erlang;

Busy-hour traffic per subscriber:A=

Call loss rate (service grade)

When all the channels of a system are occupied, use

the following formula to calculate call loss rate:


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Basic Knowledge of Capacity PlanningErlang-B


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Capacity Planning

According to the number of subscribers, traffic model, and local

economic situations, forecast network traffic.

According to the number of BTSs, obtain the average traffic load of asingle BTS and channel configuration data.

Description about Capacity Planning


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Capacity Planning

A local network will be constructed. After two years, the

number of subscribers may attain 100,000. Provide that the

traffic per subscriber is 0.02Erl, 120 BTSs are required, and

the call loss rate is 2%.

Case about Capacity Forecast

Useful information

Subscriber quantity: 100,000

Call loss rate: 2%

Traffic model: 0.02Erl

Number of BTSs: 120


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Capacity PlanningCase about Capacity Forecast

Roaming factor (traffic and developing trend): 10%; dynamic factor (burst

traffic): 15%

Network capacity: 10(1+10%+15%)=125000

In terms of congestion, use 85% to calculate the bearer capability for traffic.

Thus, the design capacity of network is: 12.5/(85%)=147100, that is 150000.

According to the provided traffic model, that is average 0.02Erl traffic, forecast

the busy-hour traffic of the whole network: 150000 0.02=3000Erl.

The average traffic per BTS is: 3000/120=15Erl, average traffic per cell:

15/3=5Erl.

Based on 2% call loss rate, query the Erlang-B to find the number of voice

channels: 10 channels/every cell

The number of control channels: 12 channels/every cell, 2TRX/every cell


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Questions

What data are required for capacity

planning?

For a new network, how to plan

coverage and capacity and how to

obtain number of BTSs and that of

carriers?


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SDCCH Configuration

Common cell Inner cell Border cell Common cell Inner cell Border cell

1 SDCCH/4 SDCCH/4 SDCCH/4 SDCCH/8 SDCCH/8 SDCCH/8

2SDCCH/8 SDCCH/8 SDCCH/8 SDCCH/8 SDCCH/8

SDCCH/8+

SDCCH/4

3

SDCCH/8+

SDCCH/4

SDCCH/8+

SDCCH/4

SDCCH/8+

SDCCH/4

SDCCH/8+

SDCCH/4

SDCCH/8+

SDCCH/4

SDCCH/8+

SDCCH/4

42SDCCH/8

SDCCH/8+

SDCCH/42SDCCH/8 2SDCCH/8 2SDCCH/8 2SDCCH/8

52SDCCH/8 2SDCCH/8 2SDCCH/8 2SDCCH/8 2SDCCH/8

2SDCCH/8

+SDCCH/4

6

2SDCCH/8

+SDCCH/4 2SDCCH/8

2SDCCH/8

+SDCCH/4

2SDCCH/8

+SDCCH/4

2SDCCH/8

+SDCCH/4

2SDCCH/8

+SDCCH/4

7

2SDCCH/8

+SDCCH/4

2SDCCH/8

+SDCCH/43SDCCH/8 3SDCCH/8

2SDCCH/8

+SDCCH/43SDCCH/8

83SDCCH/8 3SDCCH/8 3SDCCH/8 3SDCCH/8 3SDCCH/8

3SDCCH/8

+SDCCH/4

TRXNumber SDCCH config. SDCCH config.

None-CBCH CBCH


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Thank You

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g-lii 202 planning for radio coverage capacity-20080312-a-2.1

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