CDMA450 RF Network CDMA450 RF Network Planning And OptimizationPlanning And Optimization

CDMA450 RF Network CDMA450 RF Network Planning And OptimizationPlanning And Optimization

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Content

CDMA Network Plan and Optimization CDMA Network Plan and Optimization

CDMA characteristic OverviewCDMA characteristic Overview

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Overview

To build a network with as much To build a network with as much capacitycapacity and and coveragecoverage as possible as possible and certain and certain quality quality of service and of service and cost cost budget, and supporting smooth budget, and supporting smooth evolutionevolution and and expansionexpansion for higher for higher

capacity and larger coveragecapacity and larger coverage。。

To build a network with as much To build a network with as much capacitycapacity and and coveragecoverage as possible as possible and certain and certain quality quality of service and of service and cost cost budget, and supporting smooth budget, and supporting smooth evolutionevolution and and expansionexpansion for higher for higher

capacity and larger coveragecapacity and larger coverage。。

CoverageCoverage QualityQuality CostCostCapacityCapacity

Balance all through network planningBalance all through network planning

Objectives——

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CDMA450 Network ProjectCDMA450 Network Project Preliminary Planning

Network Simulation

Site Survey

System Parameter Design

Equipment Installation and Testing

Network Optimization

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Preliminary PlanningPreliminary Planning- Estimate the RF network configuration based on the initial customer requirements and projections- Create a RF network plan

Video E-Mail

VOD

Multimedia Game

Video Clip

Location ServiceM-Commerce

–service classificationservice classification

–

–cost Limitationcost Limitation

–coverage coverage

requirementrequirement

–capacity capacity

requirementrequirement

–QOS (quality of service)QOS (quality of service)

–spectrum availablespectrum available

–BTSBTS、、 TRXTRX、、 channel channel

etcetc

•mapsmaps•projection on future projection on future capacity and capacity and coveragecoverage

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Voice PlanVoice Plan

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Data Plan Data Plan

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Capacity Plan Capacity Plan

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Coverage Plan Coverage Plan

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Network SimulationNetwork Simulation

Update the plan by software simulation• Site location (latitude and longitude)• Antenna type, height, azimuth and tilte• Antenna feeding system• TX channel power allocation per sector• Radio resources per site

ASSETASSET、、 PLANET are PLANET are software used software used by top vendorsby top vendors

Huawei

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Site SurveySite Survey

Verify and adjust the network plan:• Finalize site location and antenna parameters

• Collect neighbor system info

– Clear spectrum

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System DesignSystem Design

Enhance the network plan to an implementable plan including:

•PN plan

•Neighbor list

•Pilot Power

•Seacher Windows Size

•Power Contronl Parameter

•Handoff Parameter

•System Access Parameter

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Equipment Installation and TestingEquipment Installation and Testing

• Install all equipment

• Test to ensure normal working without any defects

• Update the network plan for any changes.

PC

GPS Receiver

Software…...

GSM Test Mobile

Receiver Receiver ReceiverGSM Test Mobile

GSM Test Mobile

CDMA Mobile

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Network OptimizationNetwork Optimization Based on good implementation of network plan fine-tune the plan for any missing details or special conditions hot-spot 、 blind-spot 、 special-spot etc.

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Content

CDMA Network plan and optimizationCDMA Network plan and optimization• CDMA characteristic OverviewCDMA characteristic Overview

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Content

CDMA Network plan and optimizationCDMA Network plan and optimization

CDMA characteristic OverviewCDMA characteristic Overview

CDMA CapacityCDMA Capacity

CDMA CoverageCDMA Coverage

Capacity and Coverage analyzeCapacity and Coverage analyze

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Capacity Calculation – S CityCapacity Calculation – S City

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eMXRW

QBcdma

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2433Subscribers953Subscribers

280.3Average Throughput109.8Average Throughput (kbps)

73Traffic (Erl)28.6Traffic (Erl)

2.55Sector Factor1Sector Factor

Sector SiteOmni Site

5.08Traffic Channel Eb/Nt

2%Soft Block Ratio

21Spread spectrum gain

0.4Voice Activation Factor

0.086Second Order Interference Factor

0.55Interference Factor

75%Cell Load

Need ? sites

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Capacity CalculationCapacity Calculation

Urban Surburb Country

Voice Speed 9600 9600 9600Band wind 1228800 1228800 1228800System Loading 60% 70% 80%Blocking Rate 2% 2% 2%Interference fact 0. 55 0. 2 0.1

Voice active fact 0. 4 0. 4 40%Demoduation 5. 08 5. 08 5. 08Power control 2. 5 2. 5 2. 5Capacity (Erl ) 24 36 45

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Content

CDMA Network plan and optimizationCDMA Network plan and optimization

CDMA characteristic OverviewCDMA characteristic Overview

CDMA CapacityCDMA Capacity

CDMA CoverageCDMA Coverage

Capacity and Coverage analyzeCapacity and Coverage analyze

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Link Budget--- Work out the path loss under a certain conditions, then get the cell radius with

Propagation model.

Link Budget--- Work out the path loss under a certain conditions, then get the cell radius with

Propagation model.

The maximum allowed path loss

Coverage area of a single site

The number of sites to meet the coverage

CoverageCoverage

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CoverageCoverage

mhbbp AdhhfL log)log55.69.44(log82.13log16.2655.69

Lp f

bh

mh

d

mhA

Path loss (dB)

BS antenna height (m)

MS antenna height (m)

Carrier frequency (MHz)

Distance between the BS and MS (Km)

MS antenna correction factor (dB)

)8.0log56.1()7.0log1.1( fhfA mhm

97.4)75.11(log2.3 2 mh hAm

Middle or small-size cities:

Big cities:

Frequency range: 150MHz to 2000MHz.Frequency range: 150MHz to 2000MHz.

Propagation Model– Okumura-Hata & Cost 231

Propagation Model– Okumura-Hata & Cost 231

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CoverageCoverage

Propagation Model– Terrain Correction

Propagation Model– Terrain Correction

In urban areas, adjusted as:

In rural areas (open country), adjusted as:

In rural areas (quasi open country), adjusted as:

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Tx/Rx power

Tx/Rx power

fading allowance

fading allowance

Antenna gain

Antenna gain

Feeder loss

Feeder loss

Interference allowance

Interference allowance

Antenna gain

Antenna gain

Path loss

Path loss

Forward linkReverse link

Tx/Rx power

Tx/Rx power

Soft handoff gain

Soft handoff gain

Balance

Cell Radius

CoverageCoverageLink Budget --- Link Budget ---

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Coverage – S CityCoverage – S CityLink Budget --- Cell Radius

Link Budget --- Cell Radius

7.49Km1.76Km1.45KmCell Radius

50m40m40mAntenna Height Of BS

1.5m1.5m1.5mAntenna Height Of MS

136.45dB125.29dB122.36dBMAPL

90%98%98%Required coverage probability

50%50%50%Cell Load

15dB20dB25dBPenetration loss(Indoor planning)

3.01dB3.01dB3.01dBInterference margin

0.50dB0.50dB0.50dBPower control Margin

3.7dB3.7dB3.7dBSHO gain

3.5dB3.5dB3.5dBDemodulation Threshold Eb/Nt

3.20dB3.20dB3.20dBNoise factor

125.41dBm125.41dBm127.48dBmSensitivity

15dB15dB15dBAntenna Gain

2.2dB1.93dB1.66dBLoss of Feeder and Connectors

21.55dBm21.55dBm21.55dBmMaximum power of traffic channel

RuralUrbanDense UrbanItem

Need ? sites for coverage

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450M Link budget450M Link budget

Basic parameter Rural Highway Suburb UrbanBS antennal height 50m 50m 35m 30m

7/8 Cable length 60m 60m 50m 40m

MS hight 1.5m 1.5m 1.5m 1.5m

BS antennal Gain 10dBi 10dBi 15dBi 15dBi

Cell loading 50% 50% 50% 50%

Soft handoff Gain 0dB 0dB 3.7dB 3.7dB

Require FER 2% 2% 2% 2%

Area cover probability 90% 90% 90% 90%

MS state Qui escence 30km/s Qui escence Qui escence

Rural（Open area）Suburb（Open area） Urban Megapol i s HighwayOut door 43.1 17.4 10.0 9.4 34.1

In door 25.0 6.5 2.7 1.8

In car 21.8 9.0 5.2 4.9 17.2

Wood 17.8 7.4 4.3 4.0 14.0

Water 52.8 21.2 12.3 11.4 41.8

Item

Explain It only support voice Link budget

Promulgate modeCell Radio（km）

CDMA 450 Link budget（voice only 9.6kbps）

The CDMA system is Complex interaction influencing system-wide capacity coverage and voice quality.

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Content

CDMA Network plan and optimizationCDMA Network plan and optimization

CDMA characteristic OverviewCDMA characteristic Overview

CDMA CapacityCDMA Capacity

CDMA CoverageCDMA Coverage

Capacity and Coverage analyzeCapacity and Coverage analyze

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Analysis of Link BudgetAnalysis of Link Budget Comparison of coverage between different rates of CDMA450 services

CDMA450Service type 9.6kbps

voice 19.2 kbps 38.4 kbps 76.8 kbps 153.6 kbps

Coveragesemi-diameter

ratio1 0.85 0.74 0.63 0.54

• • The differences between coverage radius are caused by different service rates and reverse link The differences between coverage radius are caused by different service rates and reverse link demodulation thresholds.demodulation thresholds.• • Compared with the voice service, when the permitted maximum path loss of the data service is Compared with the voice service, when the permitted maximum path loss of the data service is reduced, the coverage distance will shrink. The shrinkage is different for different rates of data sereduced, the coverage distance will shrink. The shrinkage is different for different rates of data services. rvices. • • The coverage shrinking degree increases slightly as the BS antenna height increases.The coverage shrinking degree increases slightly as the BS antenna height increases.

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Capacity and coverage Capacity and coverage

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Capacity and coverageCapacity and coverage

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Capacity and coverageCapacity and coverage

Thank You