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SDCCH Failed Location Update

Viewing 9 posts - 1 through 9 (of 9 total)
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  • 15th January 2009 at 08:59 #55380
    ababil
    Guest

    Dear all beloved friends,

    I have a problem with SDCCH Failed Location Update (Seimens system)that seriously impact to the SDSR rate.
    Can anybody help me what possibly can cause this problem and how to reduce this problem.

    Really appreciate all of your help and answer…

    Regards,

    ababil

    15th January 2009 at 10:52 #55381
    Kamaz
    Guest

    Hi ababil.
    I think that we have the same Pb in our Network.
    Can you please give me more details about the Pb (Values, periode, geografical destribution (on the border of LAC’s…)?

    Br’s

    15th January 2009 at 11:06 #55382
    ababil
    Guest

    Dear Kamaz,

    What is Pb??

    where can we get that value if we do optimization based only on daily monitoring statistic??

    I’m new in optimization, so I will realy appreciate your help.

    Regards,

    ababil

    15th January 2009 at 17:46 #55383
    pix
    Guest

    pb = problem

    what i would do is a drivetest or an A interface trace, in order to understand what is actually the problem.
    I could assume that the MS sends the LU request to the MSC, but why is there a failure?
    LU Request contains wrong info?
    There is no answer from MSC?
    The answer from MSC contains wrong info?

    All those questions could be answered by Air traces or A interface traces.

    16th January 2009 at 02:55 #55384
    ababil
    Guest

    Dear pix,

    In my project we don’t do drivetest for TRX upgrade so it’s hard to analyze or do Air traces or A interface traces.

    Is there any other solution to fix this problem??
    I would appreciate anykind of information.

    Regards,

    ababil

    16th January 2009 at 09:50 #55385
    pix
    Guest

    ababil,

    your problem is about location update failures… now you’re talking about tRX upgrade ? I don’t understand.

    If you want to fix a problem, the first step is to understand the problem. And you do this with investigation: in your case : traces.

    The other solution is to check with Siemens engineers if they already faced this problem in another network. Perhaps they already have the experience?

    20th January 2009 at 13:15 #55386
    Masud
    Guest

    Hello PIX

    would you please tell me why SDCCH Congestion Rate% is become too much high.

    I have been faceing this prob for a long time.
    Though i chk my BSC data base all SDCCH and TRX are fixed properly.yet why ?

    20th January 2009 at 18:09 #55387
    Pix
    Guest

    hello,

    a lot of SDCCH traffic, perhaps?

    please describe the problem with more qos indicators and capacity information. This is way too vague…

    21st January 2009 at 19:42 #55388
    Masud
    Guest

    Dear PIX.

    i put my SDCCH & TCH on time slot properly.where in one time slot One SDCCH and & 7 TCH.

    Some site i hv 2/2/2 confg, some 4/4/3 confg.

    So..how its happend SDCCH drop rate high.

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