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SD Drop Rate after MSC shifting

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  • #49778 Reply

    Hi All..

    We have shifted one BSC from one MSC to other & after that SD Drop rate of some cells has been increased to a large value.. wat can be the possible reasons???

    #49779 Reply

    it sounds like there is a misconfig in the MSC.

    the SDCCH drop is caused by the expiry of a timer during the sdcch phase. The sdcch phase is a dialog between MS and MSC : authentication, ciphering, call setup, equipment check (= DTAP messages).

    Timer expiry is normally caused by a radio failure, but in your case it might be due to a non-response from MSC or from MS.

    Have you performed a A trace to detect when is the failure occuring ?


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Reply To: SD Drop Rate after MSC shifting
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