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High_UL_TBF_Estab_Fail_Radio

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  • 21st August 2009 at 23:35 #58536
    CF
    Guest

    Hello, I am working in an Alcatel-Lucent network and we have been facing some issues with the UL_TBF_Estab_Fail_Radio_Rate; the problem is seeing in some cells where the fails raise in one hour and then it suddenly dissappears. When we have a look at the GSM stats everything looks just fine so we are discarting RF problems. This issue is affecting the Global KPI. Gamma and Alpha parameters are set to 0.
    Just FYI the KPI is around 2.6% and is needed to be below 1.5%.
    Any clues?

    22nd August 2009 at 08:16 #58537
    Pix
    Guest

    Hello CF,

    The problem comes and goes by itself ? Do you perform any action to make it disappear ?

    In ay case, I suspect that it is a little bug, hidden deep down in the software or in the database…
    In other words, it can only be fixed by some action from your tac support.

    Regards,
    Pix

    24th August 2009 at 16:07 #58538
    CF
    Guest

    Hello PIX, thanks for your answer.
    Yes, we have seen in some cells that the problem comes and goes by itselt while in others actions (such as BTS reset, recreation, GPU reset or HW changes) improve the performance of the sectors. Nevertheless in case that the problem is fixed by some of these actions some times comes again.
    I will managed to handle the issue with the support guys.
    Rgds,
    CF

    14th October 2009 at 05:23 #58539
    ahmad
    Guest

    hello CF,

    what is alpha & gamma ?

    BR
    ahmad

    14th October 2009 at 05:32 #58540
    Pix
    Guest

    Alpha and Gamma are parameters related to the Uplink Power Control in GPRS.
    If they are set to 0, it means that the UL PC GPRS is disabled.

    14th October 2009 at 21:54 #58541
    ahmad
    Guest

    thank’s pix

    but where i can found them.

    ahmad

    15th October 2009 at 03:24 #58542
    pix
    Guest

    in the omcr ?

    1st February 2010 at 09:45 #58543
    Ds
    Guest

    Hi can anyone tell me how one can optimise the values for alpha-gamma.
    what should be the values of these two when power control is enabled and alpha n gamma are having default values.

    band is 1800.

    1st February 2010 at 12:10 #58544
    pix
    Guest

    hello,

    alpha/gamm is for GPRS uplink power control. They should be set in such a way that the PC is disabled. Indeed, it can lead to some failures if the PC is enabled.

    I’m talking about GPRS UL PC. These 2 parametres won’t impact the GSM PC.

    the values should be gamma = 0 and alpha = 1 (or 0 ?? I can’t remember)

    -pix

    3rd February 2010 at 06:41 #58545
    Ds
    Guest

    thanks Pix,

    is alpha-gamma used for GPRS UL PC n not for EDGE PC?

    n what kind of failures this cav cause. UL TBF failures for GPRS services???

    how these values impact as increased from 0. as in our system default values are not 0.
    they r mch higher than 0.
    so can anyone explain this impact.

    thanks in advance

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