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call drop due to expiry of T200 timer

Viewing 9 posts - 61 through 69 (of 69 total)
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  • 4th September 2010 at 13:52 #54423
    Bijoy
    Guest

    Makarand
    1st Query
    T200 is a basic timer in the LAPDm & LAPD protocol (default value 240ms). T200 is the time between retransmissions, T200 is started for every transmission of a frame, and if the timer expires the frame is retransmitted. If the error persists after N200 retransmissions a link failure is detected and the data link is re-established. If the contact between the BSC and the BTS (or BTS & the MS)is broken the protocol will detect a link failure in approximately one second when using default values, calculated as (N200+1)*T200 + transmission and processing time.

    2nd Query
    It is just the other way round.Data link failure is the cause of HO failure

    3rd Query
    As HO process is break before make,so the data link in case of HO is from MS to target BTS.
    After the HO command ,if a data link failure is observed,HO faiure happens,& then either return to old channel or call drop happens.

    Br\\
    Bijoy

    13th October 2010 at 13:39 #54424
    Marco
    Guest

    PLESE HELPE ME, WHATS THE OPTIMUM VALUE TO T200 IN BTS SIEMENS?

    12th January 2011 at 09:37 #54425
    anurag
    Guest

    Hi ,
    plz let me know about max cap and its effect on network KPIs

    21st June 2011 at 09:36 #54426
    yogesh
    Guest

    Is SIGDEl parameter Impact Cndrop & Tndrop when it is LONG?

    8th August 2011 at 06:42 #54427
    SAYAN SARKAR
    Guest

    HOW CAN I CHANGE T200F AND T200S VALUE FROM BSC END.THE BSC IS A NOKIA DX-200 BSC.CAN YOU PLEASE SUPPLY THE COMMAND..OR THE PROCESS…

    WHY THIS TIMER IS NEEDED IN GSM ??

    21st January 2012 at 06:06 #54428
    sumit mathur
    Guest

    hi,

    can anyone please let me know why sd drop increases when nokia bsc is migrated from MSC to MSS. To reduce sd drop we have to increase the T200s timer value.

    22nd April 2012 at 18:41 #54429
    ahmad
    Guest

    i am GSM optimization engineer. I want to know optimum value of T200F timer to reduce TCH assignment failure rate in Nokia BSC?
    if anybody has experence about it or know other counters have effect in TCH Assignment Failure, please help me

    18th May 2012 at 20:54 #54430
    Arvind S Inani
    Guest

    We are using Nortel BSS. And facing high SD drops due to T200 timer being elapsed. Can anyone let me know the reason.

    26th July 2015 at 16:36 #54431
    Rakesh solanki
    Guest

    Values for T200 timer in NSN Bsc

    T200F – 300 & T200S – 1200

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