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high number Immediate Assignments

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  • #64921 Reply
    Water
    Guest

    Please good people may you help me. We have a problem of low CSSR as low as 80% daily.
    CSSR is affected by low SDCCH Assignment Success rate, when going further i noticed that we have a high number of immediate assignments failures (due to time out).
    When looking into this, collecting some log file(using Nemo)and checking the layer 3 messages it shows for just 1 channel request we get as high as 10 immediate Assignments. even in idle mode we get a lot of immediate assignments.
    CSSR= random access*sdcch assignment*tch assignment

    #64922 Reply
    Water
    Guest

    Please help me

    #64923 Reply
    pix
    Guest

    hello water,

    since you have done traces, could you please check what is the content of the immediate assignments ? To which Channel request do they refer ?

    1 Channel request = Establishment Cause + Random Number
    1 Immediate Assignment = SDCCH info +
    the same Random Number as the ch req it is replying to.

    when the BSC receives 1 CH REQ, it replies with only 1 Imm. Assg. So your situation is very weird !

    What you see in NEMO is all the immediate assignments of the cell, those are not all targeting your MS only ! All imm assg are sent on the AGCH, which is a common channel heard by all MS.

    Could you please share the exact values of the indicators:
    CSSR = ?
    Radom Access Failure % ?
    SDCCH Assignment Failure % ?
    SDCCH Congestion % ?
    TCH Assignment Failure %
    TCH Congestion %
    SDCCH Drop %
    Just to avoid any ambiguity :
    Those indicators should come from your QoS tool, not from NEMO.

    Thank you
    Regards
    pix

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