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sdcch_radio_fail

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  • #65116 Reply
    lfgarciath
    Guest

    Hi everyone,

    I’m studing the sdcch_radio_fail (c1003 NSN)causes and it seems that SABM message aren´t recieved at the BTS.

    The sdcch_radio_fail(c1003 NSN) are not incremented by the T3101 so, Does any one know how many SABM retransmissions the MS attemps?? How much time the BTS waits for the SABM before sending the Connection failure to the BTS??

    Thanks!!

    #65117 Reply
    Bijoy
    Guest

    This counters increment when there is a RLT timeout on a SDCCH Transaction.

    how many SABM retransmissions the MS attemps?? >> N200+1

    How much time the BTS waits for the SABM before sending the Connection failure to the BTS?? >> T3101

    Br\\
    Bijoy

    #65118 Reply
    lfgarciath
    Guest

    Thanks for the info Bijoy,

    I have another question… What effects can you expect if you change T200 from 240ms to 540ms?? I have seen a sdcch_radio_fail reduction, but there is any collateral konwn issues??… Is it OK??

    #65119 Reply
    Bijoy
    Guest

    Higher the T200,higher will be the SDCCH Holding time.

    Br\\
    Bijoy

    #65120 Reply
    lfgarciath
    Guest

    Hi Bijoy,

    I’ve made a test in a complete BSC. Results:

    1. A 30% of Sdcch_radio_fail reduction (less Denied)
    2. A 50% of tch_abis_fail increment (more Drop call)

    What we’ve seen is that you are moving the problem from the sdcch to the TCH assignment procedure.

    BR

    #65121 Reply
    Bijoy
    Guest

    Hi lfgarciath

    Plz check if tch_abis fail is occuring due to T3109 expiry as tch drop due to T3109 expiry is not a user perceived drop.

    Br\\
    Bijoy

    #65122 Reply
    hanumant
    Guest

    Hi,

    I have observed decrase in sdcch drop in cell level after incraseing the RLT.

    Can anyone explain me?

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