Pilot Channel failure - High Downlink Interference

Symptoms:

From the drive test, following symptoms will be observed by using TEMS:

• Received Ec/No of the pilot channel is less than –16dB and

• Received RSCP of the pilot channel is high enough to maintain the connection,e.g. >-   100dBm and

• DL RSSI is very high and

• The connection finally drops.

Good Excel Sheet on CPICH Calculator

CPICH Optimization

Good Document on CPICH Optimization from Maxis

CPICH Optimization

You can view Document Here

Content

• Objective
• Technical Background
• Deployment Area
• Performance Results
• Traffic Results
• Capacity Results
• Summary

Download Full Document in PDF from Here

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

How Can We Avoide IRAT Handover?
Traffic Shift Strategy for 3G to 2G

What is a typical CPICH power?

CPICH power typically takes about 10% of the total NodeB power.  For a 20W (43dBm) NodeB, CPICH is around 2W (33dBm).

In urban areas where in-building coverage is taken care of by in-building installations, the CPICH may sometimes go as low as 5% because:

• The coverage area is small since users are close to the site, and
• More power can be allocated to traffic channels.

Find UMTS Questions and Answers

Nemo Outdoor and Analyzer Training Slides