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Interference

  • This topic has 13 replies, 1 voice, and was last updated 16 years ago by pix.
Viewing 14 posts - 1 through 14 (of 14 total)
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  • 25th November 2008 at 06:23 #54756
    nish
    Guest

    Dear All

    How to identify the interference in a particular cell. Are ther any special index should be considered.. or measures…? plz let me know asp……

    25th November 2008 at 09:39 #54757
    Pix
    Guest

    Check out the number of HO due to bad quality or due to interference in the cell. This is the easiest way to detect interference.
    To see how severe they are, check out the TCH assignment failure and the call drop rate.

    IF available, check the IDLE BAND measurements (in alcatel system)

    26th November 2008 at 05:06 #54758
    nish
    Guest

    Dear Pix

    I didn’t understand what do you mean by HO…
    As you say there are TCH assignment failures and call drops….but we cannot say that its due to interference……so I want the definite identification for that………Plzzzzz

    26th November 2008 at 07:56 #54759
    RH
    Guest

    here’s some more procedure:

    1)If you have any optimization tool to plot the measurment graph of rx_level and rx_qual in the same graph, and if you see that rx_qual is poor and rx_level is strong,then you can guess interference in that cell.

    2)Get the BER statistics for each TRX of a prticularly cell. Interference affected TRX should have high BER.(But high BER,may also due to faulty HW,so check this first).

    3)Perform drivetest, try to setup call both in BCCH carrier and in non-BCCH carrier to see which are affected.

    ..and…Pix already mentioned to guess quickly probably the presence of interference.

    26th November 2008 at 09:35 #54760
    Kamaz
    Guest

    Hi experts,
    In case of interference Pb, you will have low RxQual ( > 3) with high RxLev + Degradation of Call Drop, TCH Fail, HO Better Cell

    If you have alcatel System check RMS measurments (RMS_Call_noisy_interference.
    But you need in last tstep to perform Drivetest

    26th November 2008 at 09:36 #54761
    pix
    Guest

    HO = handovers

    26th November 2008 at 10:30 #54762
    nish
    Guest

    Hi all

    Thank you all of your concerns.

    27th November 2008 at 09:18 #54763
    mas
    Guest

    Dears;
    If you mean interference due to frequacy it is better to check the SDDCH faiualr

    9th December 2008 at 14:11 #54764
    Mahesh
    Guest

    How c/i is mesured in Hopping ???could any one explain this

    12th December 2008 at 13:47 #54765
    Atapé
    Guest

    HI

    Is there any OMC indicator for detecting interference in a cell for alcatel BSS?

    12th December 2008 at 16:14 #54766
    ATTO
    Guest

    Hi pix,
    Could u plz tell me more about IDLE BAND measurements?

    13th December 2008 at 09:46 #54767
    Pix
    Guest

    Atto,

    Idle band measurements are done in UL by the BTS : when a TS is not used by a MS, the BTS listens to the noise on this particular timeslot.
    It gives an indication of the interference noise on this particular TRX.

    Regards
    Pix

    17th December 2008 at 13:49 #54768
    Antapé
    Guest

    Hi pix,

    Is there any counter or indicator for interference measurement, in idle band? if not how can we observe result of idle measurement on free time slot?

    17th December 2008 at 17:47 #54769
    pix
    Guest

    antapé, of course, there is an indicator for idle band measurement.
    You’ll find it in the PM Viewer, or in RNO.

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