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High SD Fail rate after B10 migration

  • This topic has 4 replies, 1 voice, and was last updated 11 years ago by Hellsing.
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  • #62083 Reply

    hi all, after B10 migration we faced sporadic SD Fail rate increase (about 30%) in many cells in our network (in both G2 and MX BSCs)?

    how to investiguate in this case? is this normal behaviour? what are the curative actions to be done?

    #62084 Reply

    Hello hellsing,

    It is not a standard behaviour. Having done a migration, you should get a heavy support from ALU engineering teams, you should quickly check with them.
    Usually, i recommend a TRX/RSL/BTS reset, but if it comes and goes by itself then there is perhaps another issue.


    #62085 Reply

    we have alcatel support but since ten days they were not able do fix it, and they made only TCUC restart and problem is still there, could i fix this problem by having some traces, if so A interface or Air?

    #62086 Reply


    have you tried the actions on the BTS, rather than the TCUC ? Locating the SDCCH ts on another ts ?

    Abis trace would show the contents of the channel requests which are subsequently lost (cause estab, timing advance,..). But I’m not sure you’ll find anything interesting here… who knows, you still can try 🙂

    Can you please check the main usage of the SDCCH Request (MC02 x) : loc upd ? MOC ? MTC ? SMS ?
    During the fail time, do you notice anything different about this distribution ?


    #62087 Reply

    Distribution is quite same as before and no changes during fail, i’ll check if we could have Abis Trace to check, but really ubnormal 🙂

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