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TASR/Rxqual Low

Viewing 15 posts - 1 through 15 (of 16 total)
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  • #63930 Reply
    Saurabh Singh
    Guest

    In my bSC SOME Stand alon Site Having
    Low TASR/RxQual
    Please help to Improve this
    suggest any parameter.

    #63931 Reply
    Lex
    Guest

    Have you checked the reason for poor RX qual?

    #63932 Reply
    Mania
    Guest

    try finding which TRX is having bad quality BCCH, GSM hopping or DCS and then investigate for frequency clashes, Wrong inner zone settings, wrong MAL / MAIO settings, faulty Radio/ Issue with Path balance etc.

    #63933 Reply
    Saurabh Singh
    Guest

    Tnaks for the help Mania

    #63934 Reply
    anshu
    Guest

    Can any one tell me cascading is also reason for Poor TASR.

    #63935 Reply
    Saurabh Singh
    Guest

    Hi Mania,

    Please help me again
    here some cells are coming of ageing 2-3 days in TASR& TCR.
    Then Its automatically disappear in bad KPI.

    #63936 Reply
    Mania
    Guest

    Hi Saurabh,
    Could you please explain, I am not familier with the terms TASR& TCR..
    I can assume TASR to be TCH_Assign_Success_Rate but no idea of TCR. Also which vendor are you working on.

    #63937 Reply
    Saurabh Singh
    Guest

    TCR – TCH Comp rate
    I am working for Huawei.

    #63938 Reply
    Bijoy
    Guest

    TCR=100-TCH Drop Rate

    #63939 Reply
    Saurabh Singh
    Guest

    Yes

    #63940 Reply
    Mania
    Guest

    Well not familiar with Huawei I think you should start with the usual checking. if the cells are of the same cluster check if IOI is on the increase with same trend. Check if the whole BSC gets effected then it might be some hardware level issue. however if these are random cells at random locations then analyse individually as mentioned below.
    As to which TRX / set of hardware gets degraded for each site when the degradation occurs. Also it might be environmental issue so check if any specific band gets degraded. check if distance drops increase or RACH failures increase with the same trend.

    #63941 Reply
    Saurabh Singh
    Guest

    What the reason for delay handovers?
    While attempting the handover Rxqual and Rx level degraded?why?

    #63942 Reply
    sandy
    Guest

    any one can help me to explain rach failure

    #63943 Reply
    pix
    Guest

    hi,

    rach failure could be due to two main reasons:
    1) the channel request contains an invalid “cause” field.
    2) the timing advance is greater than the max timing advance allowed (“rach ta filter” or “max ta”)

    Reason 2 is quite straightforward. Maximum TA possible is 63, but it can be reduced by operator.

    Reason 1 : mostly due to electromagnetic noise which sounds like a near-perfect channel request. Except the field “cause” contains an invalid value.
    -> possibly HO ACCESS aimed at another cell (TCH, BSIC) where TCH(n)=BCCH(s) and BSIC(n)=BSIC(s).
    -> possibly self-generated noise from the BTS itself
    -> a crazy MS
    -> an external device that sends bursts of signal, which actually sounds like a ch. req. (i think we’ve seen an army radar which was doing this, on this forum, a while ago)

    regrds
    pix

    #63944 Reply
    guru
    Guest

    Cascading will have impact on TASR….iF you configure more than 12 trx in a single E1 ,you are going to get issues.

Viewing 15 posts - 1 through 15 (of 16 total)
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