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SDCCH utilization

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  • #59784 Reply
    cool
    Guest

    hi.. has anybody experienced this? i have a cell with only ~15% sdcch utilization but experiencing sdcch blocking. what could be the cause? thanks..

    #59785 Reply
    raman
    Guest

    hardware issue….or media having errors ….

    #59786 Reply
    Jaspreet
    Guest

    Hi

    It may be due to LAC boundaries.
    Also check neighbouring cell’s LAC
    due to frequent updations SD blocking is occuring.

    Hope this help.
    //BR
    Jaspreet

    #59787 Reply
    Bijoy
    Guest

    Hi jaspreet.
    Dont you think SDCCH peak Utilisation will be high in case of very High LU.

    Br\\
    Bijoy

    #59788 Reply
    Jaspreet
    Guest

    bijoy sir,

    you are right(I misread the question as only SD blocking) but In case it is utilized at peak then it wud lead to SD congestion not Blocking because at that time no attempt for SD channel will be made so no point of blocking.

    If I m wrong then, you can pls elaborate this as it wud add to my knowledge.

    thanks

    #59789 Reply
    Bijoy
    Guest

    Hi Jaspreet
    Which system are you working on?
    That would help me to explain better.
    Also I would like to rectify you that even if there is no free SDCCH (i,e SDCCH Congestion),BSC has no intelligence that it will prevent MS for SDCCH requests to that cell.

    Br\\
    Bijoy

    #59790 Reply
    Jaspreet
    Guest

    Hi Bijoy

    I m working on huawei system.

    #59791 Reply
    Bijoy
    Guest

    Ok Jaspreet
    If in Huawei system you are facing such type of issue,check for the following
    1.check for HDLC congestion.
    2.Check whether you have set “Concentric cell”=”yes” for a normal cell.
    3.Check if the feature “Dynamic MAIO” is kept “ON”

    Br\\
    Bijoy

    #59792 Reply
    MAkarand S Dere
    Guest

    Hi Bijoy,

    Can SDCCH hop & In case of SDCCH when on Non BCCH TRX will radiate by which freq.

    #59793 Reply
    Bijoy
    Guest

    Makarand
    SDCCH TS will hop if on Hopping TRX,otherwise not.

    #59794 Reply
    kenji
    Guest

    hi bijoy.. how about in nokia system? what should i check when im experiencing sd blocking but low utilization? please help.. thanks,,

    #59795 Reply
    Austin
    Guest

    I have this alarm for nokia bts – Working SDCCH channel below threshold. please i need assistant on howto resolve this issue. thanks.

    #59796 Reply
    Bijoy
    Guest

    Kenji
    Check my reply on the topic”Abrupt nature of SDCCH Blocking in N/W”.
    Austin
    This ratio is set in BSC .The parameter name is “ALSDC”.The recommended value is 30%.
    To handle this alarm,you can check the following
    1.If any TRX containing SDCCH has gone faulty or blocked.
    2.If the parameter ALSDC is set too high.
    3.Wheteher Dynamic SDCCH is disabled

    Br\\
    Bijoy

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