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How to improve SDCCH Access

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  • #69539 Reply

    Hi All,

    Is there someone can help me to fix IASR issue. CSR is going down on BH (18h to 22h). Sometime there is LAPD Link Congestion alarm on the concerned sites.
    Even the ratio of Attempted Imm Ass by Succussful Imm Ass is going down on BH, too much attempted failed on SDCCH and TCH on BH.
    Thanks in advance for your support!

    #69540 Reply


    do you know the reason of the failure ?

    It’s probably congestion, isn’t it ?

    If it is congestion, then try :
    1/ activating the dynamic SDCCH adaptation
    2/ increase the TCH HR usage in the cell.
    3/ add one more TRX
    4/ Reduce number of ts for packet transfer.



    #69541 Reply

    Thx Pix for your support.
    The Poor SD is due to high traffic on Busy Hour (6pm to 10pm).
    I’ll try to increase Tch HR usage and reduce Ts packet transfer but other actions have already done.
    Merci beaucoup.

    #69542 Reply

    Hi All,
    Thanks alot to each of you for your support.
    I am happy to inform you that i fixed the issue about poor SDCCH Acc by changing the Multiplex Mode from 2:1 to 1:1 and add 1 more E1 because the issue was LapDLink congestion during Busy Hour.
    Now my KPIs are looking very good
    CSR from 40% to 99% for the concerned cells.
    Again, thanks alot to all of you.

    #69543 Reply

    hi mikmas, thanks for the feedback. Indeed, lapd congestion was one of the possibilities. Well done 😉

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