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3G drop calls – Downlink Direct Transfer

  • This topic has 0 replies, 1 voice, and was last updated 11 years ago by Blert.
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    Hi all,

    Hoping I can get some help from you guys. I’m getting a lot of CS drops that all point to the same message in the layer 3. The problem I have is that I dont know how to interpret it. The “drop” message is a DDT message and shows a “Disconnect to Mobile” message that the cause of the drop is Type 41 (temporary Network failure). Can anyone explain a bit more about the message as I dont know if its a RF/Core problem/or a PSTN problem.

    Although RSCP levels are quite low (-95ish) the ECIO measurements are well within spec (-11).

    Sorry, but I cant cut and paste the L3 messaging, but its sequence is basically:

    UL-DCCH Active set update complete
    DL-DCCH -Downlink Direct Transfer
    DL Call Control Disconnect
    UL_DCCH Uplink Direct transfer
    UL Call Control release

    Dropped call

    DL_DCCH Downlink Direct Transfer
    DL Call Control Release Complete

    Then RRC clearing commences.

    Any help appreciated


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