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Abnormal TBF drop on a cell(Ericsson)

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  • #65311 Reply

    Hi All,

    Good day. I am facing a problem with one of my Ericsson cells. It’s an EDGE cell. Defined PDTCH 3, Though cell throughput is very low, around 10~20Kbps. TBF drop rate is also abnormal. 20~30%. CS KPI is very good. DT has been conducted but often speed drops. Analyzing the log file I cant find out nothing. (Nemo log). Can u please help me to overcome the issue. This issue has been raised from a corporate client. Which parameters or KPI can i check in this regard.

    Thanks in advance.


    #65312 Reply

    Hi Pix,

    Please suggest me to solve the issue.

    Thanks and BR.


    #65313 Reply


    if you don’t see anyting abnormal during drivetest, i would suspect a customer problem… could you check
    – dl tbf congestion ?
    – dl tbf throughput ? (not per cell, but per tbf)
    – anything related to DL gprs activity : llc volume ? tbf avg duration ? volume per DL TBF ?

    it might be that you have only very very little gprs traffic in that cell therefore you have statistically a lot of chance of seeing gprs signalling for MS with poor radio quality.

    also, what is the DL RLC retransmission rate ?


    #65314 Reply

    hi all,

    please any one can help me to find formullas for the below KPIs:

    1. TBF Drop
    2.(total DL TBF abnormal released/total DL TBF normal release)

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Reply To: Abnormal TBF drop on a cell(Ericsson)
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