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Relation of SDCCH Drops with N200

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  • #69841

    Hi Everyone,

    I have a query related to SDCCH Drops. In my network (ZTE BSC ZXUR-9000), I increased value of N200 from 1 to 4 for SACCH, FACCH F/H, Establish and Release to optimize TCH Call drops due to T200 expiry. Significant improvement in TCH drops has been observed but on other hand SDCCH drops have been increased. I changed N200 for SDCCH from 1 to 4 as well but no improvement. All SDCCH drops are due to Radio link Timeout. In addition, I have also observed 1s increase in TCH Mean holding time and SDCCH mean holding time is stable.

    Some timers values in my network:

    T3101: 2sec
    T3103: 10 sec
    T3107: 10 sec

    Can you please guide me that why increase in N200 is impacting SDCCH drops? any additional timer I am missing?

    roland b

    Make the N200 Establish and Release 1. Keep the SACCH, FACCH F/H at 4


    I suspect its some failure from Location update procedure.

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