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UL Level

Viewing 10 posts - 1 through 10 (of 10 total)
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  • 21st November 2011 at 07:53 #67531
    Man U
    Guest

    Dears

    I have some cells suffer from bad UL as compare with DL level your support Plz ,

    Vendor is huawei

    21st November 2011 at 09:18 #67532
    pix
    Guest

    hello,
    can you check their path balance ?

    regards,
    pix

    23rd November 2011 at 11:42 #67533
    Man U
    Guest

    Hi Pix I already checked PB &TA both of them are OK

    23rd November 2011 at 22:06 #67534
    pix
    Guest

    hi,

    what ul rxlev and dl rxlev do you observe ?

    how do you measure those values ?

    how many trx in this cell ?

    regards
    pix

    28th November 2011 at 06:57 #67535
    Man U
    Guest

    Hi Pix The difference reach to 20dB for some cells ,
    6 TRXs &4TRXs

    28th November 2011 at 16:08 #67536
    pix
    Guest

    so you mean RXLEV_UL = -90dBm and RXLEV_DL = -70dBm ?

    here is a simplified link budget, for a cell with 6 TRX:
    DL:
    trx tx = 46dBm
    2 * combiners = -9dB
    feeder/antenna/radio loss = -100dB (as an example.)
    –> RXLEV_DL = -63dBm

    UL:
    ms tx = 33dBm
    feeder/antenna/radio loss = -100dB
    ul diversity gain = +3dB
    –> RLEV_UL = -64dBm

    So for such cell, the UL and DL should be similar (assuming your trx-tx-power are around 46dBm).

    Since you are seeing a big difference it’s either:
    -bad path balance on at least one trx
    – power control in UL but no in DL -> either you didn’t activate it , or there is a bad quality in DL therefore the TRX has to transmit stronger.

    regards
    pix

    29th November 2011 at 08:27 #67537
    Man U
    Guest

    Dear Pix

    many thanks for your answer
    Just small note

    DL&UL PC =YES FOR ALL BSC

    30th November 2011 at 10:54 #67538
    pix
    Guest

    man u,

    so you think the difference you saw was caused by power control ?

    30th November 2011 at 11:21 #67539
    Man U
    Guest

    No , pix cuz both of them are Activate UL\DL

    30th November 2011 at 14:26 #67540
    pix
    Guest

    yes, they can be activated but they will not attenuate the signal symmetrically. If there is a bad RXQUAL in DL? then the DL signal is less reduced than the UL.
    I’m quite certain that what you are seeing is due to PC.
    Otherwise you should see an unbalanced Path_Balance in the TRX. Since you don’t see it… it has to be PC.

    pix

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