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  • #49548

    We connected EIR to our system and realized that SDCCH drop has increased (worsened).How can I reduce SDCCH drop but keep the EIR connected. Is it a problem with SDCCH dimensioning?


    Hello Kuuku 🙂

    By putting an EIR in your network, it forces the MS’s to send their IMEI to the network. It is done thanks to the UL message “IDREQ”. The MSC replies with the “IDRES”.

    As this message is vendor’s dependent, there is no specific time when these messages shall be performed. Usually, it is done during the call setup, over the SDCCH channel.

    Due to wrong configuration, maybe the IDRES takes a lot of time to reach the MS. This procedure might increase the time the user stays on the SDCCH. –> it increases the chances of SDCCH drop.

    The SDCCH dimensioning is not the problem : if you had SDCCH dimensioning problems, it would lead to more SDCCH congestion. Not to more SDCCH drops.

    In order to investigate the problem, you can perform an A-trace of a few call setups, and check the duration of the SDCCH phase (starting with the AUTREQ authentication request, ending with ASCMP assignment complete)



    Are you working on LU or call? Better to be with LU (When n/w has few LAI) & increase the acess limit


    I work with E/// equipment, and would like to know how to plan and dimension for EIR IMEI-CHECK capacity and SS7 requirements given total HLR subs, BHCA, VLR subs

    please help

Viewing 4 posts - 1 through 4 (of 4 total)
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