Huawei PDCH establishment success rate is low

[kentck86]

Hi all,

I am having issue on PDCH establishment success rate low for one cell. Where it is seen that this cell is having CS and ps traffic trend and PDCH config as follows:

Please advise on what is the exact issue here and whats the direction of optimization should i heading for on this case? Thank you.

CS_Traffic_Trending.jpgNo_of_configured_PDCH.jpgPDCH_SR.jpgPDCH_Utilization.jpgULDL_TBF_Attempt.jpg

[jayk]

Must be congestion in cell at that time. Suggest to increase Static TS in cells.

[kentck86]

Must be congestion in cell at that time. Suggest to increase Static TS in cells.

Hi Jayk,

There were only one type of congestion founded for this cell,Kindly please find the TCH congestion as follows:

TCH Congestion(%)=([K3020:TCH Seizure Requests (Signaling Channel)]+[K3010A:TCH Seizure Requests (Traffic Channel)]+[K3010B:TCH Seizure Requests in TCH Handovers (Traffic Channel)]-[CR443B:Completed Handovers])/([K3020:TCH Seizure Requests (Signaling Channel)]+[K3010A:TCH Seizure Requests (Traffic Channel)]+[K3010B:TCH Seizure Requests in TCH Handovers (Traffic Channel)])*{100}

However, it is seen that the cell 3 which is the issue cell which having PDCH success rate low issue doesnt show the congestion trending match with the success rate. Please advise further on what are the possible issue? thank you

TCH_Congestion.jpg

[RF engineer]

dear

How many TRX configured per cell , it seem you have some kind of TRX hardware
problem, tell the bss to make reset for you with level 4 (reload all configuration) then see if it gone or not.

[kentck86]

dear

How many TRX configured per cell , it seem you have some kind of TRX hardware
problem, tell the bss to make reset for you with level 4 (reload all configuration) then see if it gone or not.

Hi,

Per cell configured 2 TRXs. no any other way besides this?

thank you

[jayk]

It is due to congestion, Voice call is always priority, it takes all resources from PS. Check out the TBF congestion "downlink TBF congestion rate"

[RF engineer]

Dear

This the reason for the moment it seems also you have congestion for CS so PS also
have problem try to activate Half rate and add fixed PDCH.

[nikolay.gelsin]

Hi.

You need to find the most often reason of fails. For instance,

DOWN.GPRS.TBF.ESTB.FAIL.NO.CHAN.RES

DOWN.GPRS.TBF.ESTB.FAIL.MS.NO.RESP

DOWN.GPRS.TBF.ESTB.FAIL.OTHER.CAUSE

DOWN.EGPRS.TBF.ESTB.FAIL.NO.CHAN.RES

DOWN.EGPRS.TBF.ESTB.FAIL.MS.NO.RESP

DOWN.EGPRS.TBF.ESTB.FAIL.OTHER.CAUSE

After clarification of this, you will see what to do next. If its NO.CHAN.RES - add 1 more PDCHTS, etc.
Also check overload in CCCH.

Kindly feedback the results.

[Syed Fahad]

Dear,

Kindly check the MAX PDCH Rate for the cell, if it is configured to 7 / 10, you can increase it to 25/30 and than check.
Kindly note that increasing the Value on Concentric cells, returns increase in DCR.

Syed Fahad