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TCH Assignment Failure

  • This topic has 13 replies, 1 voice, and was last updated 14 years ago by akuiser.
Viewing 14 posts - 1 through 14 (of 14 total)
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  • 26th November 2010 at 06:43 #65131
    akuiser
    Guest

    Hi,

    I have a problem which is TCH Assignment failure & TCH drop become higher after TRX upgrade.
    Any idea why this happened and how to analysis the root cause? Also the solution. Is this cause by hardware?Thank in advance.

    26th November 2010 at 08:47 #65132
    b
    Guest

    What vendor r u using?
    what type of upgrade?

    30th November 2010 at 03:02 #65133
    akuiser
    Guest

    Hi b,

    thank for reply.
    we are using ALU and we have performed upgrading from 3 to 5 TRX due to congestion issues.Any idea?

    30th November 2010 at 04:32 #65134
    Tanuj
    Guest

    is this in all sites where you have gone from 3 to 5 trx

    30th November 2010 at 04:42 #65135
    akuiser
    Guest

    only 1 site.We upgrade this site only on sector 2 & 3 from 3 to 5 TRX. we suspect TRX problem but the problem still persist after change TRX. We also check for new freq applied but it’s clean freq and freq hopping also enable at this site.

    30th November 2010 at 06:55 #65136
    Pramit
    Guest

    Dear Can you plz confirm whether the problem has been solved?

    30th November 2010 at 08:57 #65137
    akuiser
    Guest

    the problem still not solve

    30th November 2010 at 10:09 #65138
    Tanuj
    Guest

    Are there any slips in the dip

    30th November 2010 at 15:26 #65139
    K.K.nath
    Guest

    If there are no issue with maio i.e.maio planing are good,then check the RF cables which you for expansion.There may be mino variation of VSWR.Also enable DTX and 4th maio put in low priority.

    30th November 2010 at 17:54 #65140
    Tanuj
    Guest

    Yes check trx connections with the cdu there may be wrong connections

    1st December 2010 at 07:01 #65141
    akuiser
    Guest

    ok…we plan to change the RF cable & see how the outcome.beside that, if there any other plan that we can perform? i’m not sure whether this problem was cause by poor coverage at boundry area.What is parameter that i can analysis to confirm this?is it posibble if we increase RXLEV_ACCESS_MIN value?so the cells which having poor coverage can’t access this serving cell & avoid drop call.

    1st December 2010 at 17:45 #65142
    pix
    Guest

    hi akuiser,

    in the alu system, you can get more details about your problem :
    – check the tch efficiency rate per trx
    – check the path balance avg per trx
    – check the idle band measurements per trx (if available)
    – check the dl rxlev avg & the ul rxlev avg per trx
    – check the timing adv avg per trx
    – check the noise calls due to abnormal FER per trx

    based on those indicators, you can know whether your problem is coverage related (when adding more trx, you add more combining losses, therefore decrease the dl coverage of your cell) ,or interference related, or hardware related.

    regards
    pix

    1st December 2010 at 21:24 #65143
    Rex
    Guest

    Hi akuiser,
    you didn’t answer to K.K.nath, what is your MAIO planning after upgrade to 5th TRX (if you use SFH). Check whether you use same MAIO for two TRXs from different sectors.
    Regards,

    2nd December 2010 at 09:10 #65144
    akuiser
    Guest

    thank Pix for details explanation. I will try to get more data & perform further analysis.
    Rex,
    currently we applied BBH for this site.
    Thank you for all bro for sharing your knowledges.

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