cdma450 rf network planning and optimization1.ppt
TRANSCRIPT
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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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