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UL quality

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Viewing 8 posts - 61 through 68 (of 68 total)
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  • #43396 Reply
    GEO
    Guest

    Hi
    What are the reasons for abis drop in Nokia BTS

    #43397 Reply
    yogesh_rf
    Guest

    hi PIX,
    I am facing a pblm . in INTER MSC handover,handover command is given from one MSC to another(HUWAII and ERICSSON MSC)but one side handover is happening and other side is not happening,will be highly thankful for your comments

    Rgds
    yogesh_rf

    #43398 Reply
    pix
    Guest

    hi yogesh,

    i got this kind of problems before… but there are lots of possible solutions.

    first of all, check that the LAC, CI of the external neighbors cells are defined in both OMCR and in both MSC. 50% of the case, the people in charge of OMCR or MSC will ensure you they did it correctly. Don’t trust them and ask them to check it again thoroughly.

    second thing, you can ask a NSS guy to check an internal “addressing” table in the MSC, or something. Unfortunately I can’t remember what is was exactly… I just remember that the external LAC or external BSC wasn’t correctly defined in the NSS, but I’m not able to explain more.

    as far as i recall, that’s it… but as i said, many things can go wrong. And most of them are linked to NSS.. sit down around a table with a NSS QoS expert and isolate the problem (problem hapenning during the handover preparation or execution ? where exactly is the failure ocuring ? which message exactly ? on which interface ?).

    #43399 Reply
    krishnan
    Guest

    hi yogesh

    one more solution if u find everthing ok just check the handover controlling party is it the MSC or the BSC .It should be MSC..

    #43400 Reply
    yogesh_rf
    Guest

    hi krishnan,
    Case was solved and i think in intermsc HO we should see for BSSMAP between BSC and MSC.

    Rgds
    yogesh_rf

    #43401 Reply
    tremalnike
    Guest

    Hi Tag,
    please see matrix of average timing advance per UL RxQual and per RxLev. Rural or city is problem BTS ? May be under antenna ampfiler will help you ….

    #43402 Reply
    binh
    Guest

    can i ask everyone some questions ? what is prime reason drop call rate high in GSM ? can you give some document about drop call rate ? Thank you very much

    #43403 Reply
    Pix
    Guest

    Binh,

    A very high call drop rate is most probably the consequence of one of these two causes :

    1. equipment failures (especially poor ABIS links, or faulty BSC/TC boards)

    2. poor frequencly planning & poor cell planning (too much overlap, not enough downtilt)

    Other problems, such as wrong parameters, low coverage, etc, can also cause problems, but usually not so critical.

Viewing 8 posts - 61 through 68 (of 68 total)
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