HSDPA Frame Loss

These counters relating to frame loss are available on the RBS to monitor HighSpeed data service in the downlink direction.

IubDataStreams::pmHsDataFramesLostSpiXX
- the number of HSdata frames lost, destroyed and errored over Iub in the RBS. There areseparate counters for each of the priority classes.

IubDataStreams::pmHsDataFramesReceivedSpiXX
- the totalnumber of HS data frames correctly received over Iub in the RBS. Thereare separate counters for each of the priority classes.

The XX suffix represents the priority class and can range from 00 to 15.The counters can be used to indicate data loss rate for the HS service.High frame loss will indicate potential congestion problems. RecommendedPerformance Indicator for this is:



Frame Loss Rate on the path from SRNC to RBS

Find more HSDPA Counters at www.telecomfunda.com/forum

How to get HSDPA users in Ericsson System?

This is the formula:

HSDPA users average cell:

HS_Users = (pmSumBestPsHsAdchRabEstablish) / (pmSamplesBestPsHsAdchRabEstablish)

Click on counter to view detail description in counter.

If you know another way than please share it.

Know more on HSDPA Low Throughput Analysis

How can I find RRU Type in Ericsson NodeB?

There are several ways to Find RRU type in Node B.

For Ericsson System connect through MOSHELL and

Enter command cabx you can find the RRU type.

Also enter INVH Command for RRU and DUW type.

If You Know More Ways to Know than Discuss Here

What are the possible causes for an Access Failure in UMTS?

• Missing Neighbors
• Poor Coverage
• Pilot Pollution / Spillover
• Poor Cell Reselection
• Core Network Issues
• Non – availability of resources. Admission Control denies
• Hardware Issues
• Improper RACH Parameters
• External Interference

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What are the possible causes for an IRAT Failure?

There are several reasons for IRAT failure in cellular network optimization.
Major 4 reasons which played good role in WCDMA Optimization.

·         Missing 2G relations

·         Non availability of 2G Resources

·         Poor 2G Coverage

·         Missing 3G Relations

What are fast fading and slow fading?

Fast fading is also called multi-path fading, as a result of multi-path propagation.  When multi-path signals arriving at a UE, the constructive and destructive phases create a variation in signal strength.

Slow fading is also called shadowing.  When a UE moves away from a cell the signal strength drops down slowly.

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Detail Doc on Layer 3 Messages

Call Flow with Layer 3 Messages on Ericsson System