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SDCCH Drop – Alcatel vendor

Viewing 9 posts - 1 through 9 (of 9 total)
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  • 4th January 2008 at 19:57 #50282
    remix
    Guest

    Hi,
    what is the reason for high rate of SDCCH drops? They appeared sudenly and are observed only for one cell.I work with Alcatel equipment.
    10x

    5th January 2008 at 11:34 #50283
    Pix
    Guest

    If something appears suddenly in alcatel equipment, and if there was no modification of frequencies (so it is not relate to interference), then it is linked to a little hardware bug.

    Have you tried :
    TRX RESTART
    if still not okay then, RA LOCK/UNLOCK
    if still not okay, then BTS LOCK/UNLOCK

    But first of all, be sure nobody changed anything in the frequencies or some radio parameters.

    Regards,
    Pix

    14th January 2008 at 08:30 #50284
    Vladislav
    Guest

    Hi, if the type of tre (trx) is TRAGe or TRADe and BaseBandHopping is used, the reason of SDCCH drop ( more than 15%) would be the incorrect work of one of these trx in BBH. You could be disable BBH and after check KPI’s.

    24th January 2008 at 06:31 #50285
    lvin
    Guest

    hi every body
    we have SDCCH congestion how we can solve this problem?
    we have adabtive configuration.for many cells is on,in slevel=1.but aslo we have SDCCH congestion.our support is Ericsson.

    24th January 2008 at 08:03 #50286
    pix
    Guest

    1. increase number of sdcch static timeslots
    does the congestion disappear ?

    2. is the sdcch traffic very high (much higher than normal) ?

    3. what is the cause of sdcch traffic (OC, TC, LU, SMS, Emerg call ?)

    4. check the SDCCH traffic on each timeslot, or on each TRX. Do you notice some TRX with poor SDCCH usage (very short or very long SDCCH duration, low or high number of sdcch allocations, …)

    24th January 2008 at 08:38 #50287
    lvin
    Guest

    thanks Mr.PIX for ur information……
    the SDCH traffic is higher than normal,because normal is(2%)but we have for some cells are higher than this.for examle one cell:
    1-TCHCong: %41.41
    2-SDCCH Cong :%53.63
    3-No.of SDCCH:26
    we have also adaptive configuration.for this cell on and in slevel=1.

    24th January 2008 at 09:18 #50288
    pix
    Guest

    40% of tch congestion
    50% of sdcch congestion

    yes, that’s a very difficult problem, and maybe i’m wrong but do you think there is a lot of traffic in this cell ? 🙂

    just add some TRX, or activate half-rate, my friend, that’s all. there are no other solution for such a high amount of congestion.

    3rd February 2008 at 05:35 #50289
    shrawan
    Guest

    cause of sd drop and tch drop on mokia system

    3rd February 2008 at 14:45 #50290
    mehrdad
    Guest

    hi elvin,
    the coverage of your cell is right? Check TA report for this cell, maybe it is a overshoot cell.

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