CPICH Optimization

EUGAP, Singapore, Nov 2011

Presentation by:

David Thayalan

Agenda

• Objective

• Technical Background

• Deployment Area

• Performance Results

• Traffic Results

• Capacity Results

• Summary

CPICH Optimization Drivers

• Deployment of CPICH optimization is driven by:

– Improving current 3G coverage and increase 3G traffic

– Improve in-building penetration for 3G

– Reduce IRAT HO to 2G

– Offload traffic from 2G layer

Technical Background

To expand current 3G network coverage, the CPICH power was increase on all

sites by 1.7dBm, hence the RBS will be using 10% of the total MCPA power

instead of 6.7% previously.

To avoid power limitation, admission for power was also increased by 4%.

W dBm

%

primaryCpich

Power

CPICH +

Common

Channel

User Traffic

44.7 30

38.8

99

25

34.7 10 3

7.5

Congestion Control kicks in

CPICH Increase

Common Channel

Available Power

Deployment Area

3G Sites

Malaysia

Penang Island

CPICH power was increased (22/06/2011) in Penang Island where it has a dense

urban topology with a mixture of high rise buildings, condominiums, residential

and factory areas.

Performance - CSSR

• Speech & PS CSSR is maintained

Performance – Retainability

• Speech DCR is maintained

Traffic – Speech Erlang

• ~10% increase in total speech Erlang,

Traffic - Data

• Slight increase in overall PS traffic ~8 %

• Slight degradation in HSDPA throughput ~6 %

Traffic - IRAT

• IRAT HO Activity has reduced by 2% as more deep indoor users

can be served by 3G network

• Slight increase in IRAT HO Success Rate

Capacity – Admission Failures

• Increase in admission failures due to Power, Channel Element

Capacity – Power & Channel Element

% of Max Power

Distribution Used

Increased by 10%

Avg CE Increased by 8%

Power Utilization

CE Utilization

CPICH Optimization - Summary

.

• Significant increase in 3G Traffic

- Speech Erlang increased by 10%

- Data Traffic increased by 8%

• Decrease in IRAT HO Activity

- 2% decrease in IRAT HO Activity

- In lower CPICH setting, possible of areas where 3G coverage was

poor hence IRAT HO was required.

- With higher CPICH power setting hence enhance coverage, UE will be served

by 3G network and avoid IRAT HO to GSM network

• CSSR, DCR, HO SR KPI are maintained.

• Power & Channel Element utilization increased 10% and 8% respectively

• Slight degradation in HS Throughput by 6%

THANK YOU

Backup

Capacity – Power & Channel Element

% of Max Power

Distribution Used

Increased by 10%

Avg CE Increased by 8%

Power Utilization

CE Utilization