Radio Network Tuning and Optimization for Universal Mobile Telecommunications System (UMTS)

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Radio Network Tunning and Optimization for UMTS

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AGENDA Motivation 2G-3G, What is different Tuning Process Flow Tools used for Tuning Activity Equipments Configuration Pilot Tuning UE Tuning Final Words

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MOTIVATION 3G networks are becoming commercially available all over the world To check the functionality of the networks before commercial launch Network designs are based on propagations models and simulations (coverage verification) 3G technology (WCDMA) is different from 2G Tools and methods for 3G Networks

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Differences compared to 2G In General - The Technology is more complicated (Overlapping cells, soft hand over, power control, cell breathing etc) - High performance requirements on products (UE & Network nodes) - In Particular for Tuning & Optimzation - Process & tools are under development - Co-located GSM/3G sites - Shared Antenna System - Inter-working with GSM5

Tuning or Optimization, What is the difference During Tuning No traffic in the network, No subscribers Network tuned only based on drive test data Labour intensive with repeated drive test All is about Pre-launch activities During Optimization Commercial traffic, subscribers using the network Statistics used widely to monitor network performance Drive testing just in case All is about Postlaunch activities6

Tuning Process FlowRadio Network Initial Tuning for WCDMA

Preparations

Parameter Audit

Drive Testing & Post Processing

Analysis & Change Proposals

Change Verification & Reporting

Commercial Launch

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Tuning Process Flowchart

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Tools For Tuning/Optimization & Data Post ProcessingActive measurement needed due to lack of statistics TEMS Investigation for WCDMA (Software) TEMS Scanner (Software + HW) External GPS User Equipment (UE) TEMS DeskCat for post processing MCOM3g/Mapinfo MS Access/Excel based tools

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Drive test tools configurationDrive Test Equipments for Voice, CS64 & PS callShort call Long Call CS64 PS

USB1

USB2 USB1

USB1

GPS

Com 1

scanner

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Drive Test Routes

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PILOT TUNINGThe basic measurements of scanner are CPICH_RSCP (received signal code power) CPICH_Ec/No (received energy per chip divided by the power density in the band) RSSI (received signal strength indicator) What can you achieve with scanner? Crossed feeder issues (DL) Coverage verification Interference problems (overshooting cell, pilot pollution) Missing neighbours12

COVERAGE VERIFICATION - Primary Common Pilot ChannelVerify P-CPICH detection to minimize coverage holes P-CPICH RSCP P-CPICH Ec/NoCoverage level Sufficient Poor No coverage RSCP [dBm] RSCP u 100 115 e RSCP