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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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HUAWEI TECHNOLOGIES CO., LTD. HUAWEI Confidential Page 4
Contents
Chapter 1 Radio Network Planning
Chapter 2 Radio Coverage Planning
Chapter 3 Radio Capacity Planning
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HUAWEI TECHNOLOGIES CO., LTD. HUAWEI Confidential Page 5
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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HUAWEI TECHNOLOGIES CO., LTD. HUAWEI Confidential Page 6
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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HUAWEI TECHNOLOGIES CO., LTD. HUAWEI Confidential Page 7
Contents
Chapter 1 Radio Network Planning
Chapter 2 Radio Coverage Planning
Chapter 3 Radio Capacity Planning
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HUAWEI TECHNOLOGIES CO., LTD. HUAWEI Confidential Page 8
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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HUAWEI TECHNOLOGIES CO., LTD. HUAWEI Confidential Page 9
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
P
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TDU
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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HUAWEI TECHNOLOGIES CO., LTD. HUAWEI Confidential Page 10
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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HUAWEI TECHNOLOGIES CO., LTD. HUAWEI Confidential Page 12
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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HUAWEI TECHNOLOGIES CO., LTD. HUAWEI Confidential Page 13
Forecast of Coverage Distance
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HUAWEI TECHNOLOGIES CO., LTD. HUAWEI Confidential Page 14
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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HUAWEI TECHNOLOGIES CO., LTD. HUAWEI Confidential Page 15
Forecast of Coverage DistanceFrequency
Environment
Probability
Level
Required BTS
quantity
Coverage
acreage
Coverage
radius
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HUAWEI TECHNOLOGIES CO., LTD. HUAWEI Confidential Page 16
Question
What parameters are required in the
coverage planning?
How to select coverage schemeaccording to coverage requirements?
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HUAWEI TECHNOLOGIES CO., LTD. HUAWEI Confidential Page 17
Contents
Chapter 1 Radio Network Planning
Chapter 2 Radio Coverage Planning
Chapter 3 Radio Capacity Planning
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HUAWEI TECHNOLOGIES CO., LTD. HUAWEI Confidential Page 18
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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HUAWEI TECHNOLOGIES CO., LTD. HUAWEI Confidential Page 19
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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HUAWEI TECHNOLOGIES CO., LTD. HUAWEI Confidential Page 20
Basic Knowledge of Capacity PlanningErlang-B
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HUAWEI TECHNOLOGIES CO., LTD. HUAWEI Confidential Page 21
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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HUAWEI TECHNOLOGIES CO., LTD. HUAWEI Confidential Page 22
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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HUAWEI TECHNOLOGIES CO., LTD. HUAWEI Confidential Page 23
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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HUAWEI TECHNOLOGIES CO., LTD. HUAWEI Confidential Page 24
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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HUAWEI TECHNOLOGIES CO., LTD. HUAWEI Confidential Page 25
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
www.huawei.com