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T3101 expiry on TCH

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  • #60205 Reply
    Zbigniew
    Guest

    Hi all,

    what is the customer impact if the timer T3101 expires on the TCH ? Is is noticed as a drop call or not ?

    Kind Regards

    Zbigniew

    #60206 Reply
    Bijoy
    Guest

    The user will never know of it.
    Only the call setup time will be slightly higher depending on the parameter MAXRET.

    P.s. T3101 expires generally in case of SDCCH.It expires for TCH only if “Immediate assignment on TCH” is enabled.

    Br\\
    Bijoy

    #60207 Reply
    Zbigniew
    Guest

    Hi Bijoy,

    the behaviour on SDCCH is understood and I agree with your explanation, but the TCH behaviour is unclear for me.

    We have “Immediate Assignment on TCH” enabled and the counter for “TCH T3101 Expiry” shows high values. Are you sure that this expiry has bo impact on the customer (i.e. call dropping) ? How will the system react when “TCH T3101” expires ?

    Thank you !

    Zbuigniew

    #60208 Reply
    Bijoy
    Guest

    Hi Zbuigniew
    TCH 3101 expiry will not be noted by user if it is less than MAXRET.After that,no RACH retry will take place & user have to redial(here is the problem).

    The MS resends RACH each time T3101 expires till it reaches MAXRET(BTS parameter).

    Regarding call drop,it is totally a vendor dependent issue.Some incorporate it in call drop,some doesn’t.

    Br\\
    Bijoy

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