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High SD drop

Viewing 15 posts - 1 through 15 (of 39 total)
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  • 22nd December 2008 at 06:24 #55113
    Toufic
    Guest

    Dears I am experiencing a problems as such High SDCCH drops in some coastal sites!!

    SDCCH Mean holding time is long
    SDCCH Assigment fail rate is 0%
    SDCCH Abis fail is high > 20%
    SDCCH Radio fail is high > 20%

    What could be the reason,
    My Equipment is NSN our transmission system is Huwawi!!

    22nd December 2008 at 15:51 #55114
    Pix
    Guest

    Abis fail is really high… i don’t know Huawei equipment, but usually if there is an Abis failure, then it is the first thing to fix. Only when all your transmission resources are fine can you start optimize your Radio.

    Contact your transmission engineers, ask them to fix the Abis and then check again the SDCCH drop.

    22nd December 2008 at 17:22 #55115
    ATTO
    Guest

    I don’t know this KPI but if u’ve got SDCCH Abis fail is high > 20%
    it tells u that u need to check transmission equipments. U should have some alarms that can tell u how high is BER.

    As Pix say, check ur Abis before optimizing ur sites.

    23rd December 2008 at 08:17 #55116
    Toufic
    Guest

    The amazing thing is that our transmission Engineer say that there is no problem!!!
    though I suspect it is because of the Clock, which mean there is a problem in the synchronization!!!

    Cheers,
    T

    23rd December 2008 at 15:43 #55117
    ATTO
    Guest

    Hi,

    U need to check by yourself ,check with alarms.

    What is the config of your sites? 1 , 2 or 3 sectors do u have?
    Because if u’ve got problems in all ur sectors it means that ur Abis need really checkings.

    23rd December 2008 at 20:06 #55118
    Evgen
    Guest

    Toufic, in last time we also survey same problem on Ultrasites with BTS SW5.0 CD3.0. Please try find TRX with low MHT (2-3 sec.) on this cell and change corresponding BB2 card. As secondary reason – need made extention for LAPD links from 16kbps to 32 (strongly recomended Nokia if AMR use on cell). Gud luck.

    11th June 2009 at 16:02 #55119
    Dilip
    Guest

    Toufic,
    if
    sdcch radio fail is high remove sd from tch trx..

    check ut TRP it shud be 1 if ur BCCH freq is clean.

    generally sd allocation is done from the low traffic carrying trx.

    regarding ur Abis fail

    u can change ur RET and SLO paramter

    2nd September 2009 at 06:02 #55120
    Austin
    Guest

    SD DROP, HIGH Particularly in sector 2 and 3.

    SD DROP RATE
    SECTOR 1 : TRX5&6, SECTOR 2 : TRX 1&2, SECTOR 3 : TRX3&4. PLEASE how do i resolve this.

    13th October 2009 at 07:07 #55121
    pankaj
    Guest

    sd drops

    13th October 2009 at 07:15 #55122
    Pankaj
    Guest

    SDCCH Mean holding time is long
    SDCCH Assigment fail rate is 0%
    SDCCH Abis fail is high > 20%
    SDCCH Radio fail is high > 20%

    What could be the reason,
    My Equipment is NSN

    31st October 2009 at 17:28 #55123
    Rajiv
    Guest

    Plz tell me wat parameter use for sd drop to solve……..

    2nd November 2009 at 09:49 #55124
    Bijoy
    Guest

    Pankaj
    For Abis fail,check for Transmission alarms,ghost RACH,etc.
    For Radio fail,check for
    1.CO-BSIC & BCCH
    2.Frequency Plan
    3.High TA
    4.Hardware & Path Imbalance Issues
    5.High TA
    6.TSC,etc etc etc

    7th November 2009 at 07:01 #55125
    Rajiv
    Guest

    WHAT’S THE REASON ?If ALL SITE OF ONE BSC’S , HANDOVER IS FAIL ,LIKE 75%.

    2nd December 2009 at 08:34 #55126
    PANKAJ KUMAR
    Guest

    REASON FOR SD DROPS , WHAT REPORT CAN I SEE IN NOKIA ENVIRONMENT

    2nd December 2009 at 08:39 #55127
    sanjay sahni
    Guest

    How to reduce congestion on netqork level

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Viewing 15 posts - 1 through 15 (of 39 total)
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