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RF Link Balance

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  • #43405 Reply
    RF engr
    Guest

    Please throw some light on RF Link Balnce. Wat is this and wat should be the values for good link balance

    #43406 Reply
    dizz
    Guest

    To have a good link balance i.e. Uplink = downlink pathloss.

    #43407 Reply
    RF Engr
    Guest

    Please elaborate your answer and also tell me the difference between Link Balance and Path Balance

    #43408 Reply
    nall
    Guest

    Path balance = (UL loses – DL loses)+100

    *addition of the 100 is make the overall figure a positive value in stat. Plz correct me if I’m wrong!

    further there is set parameter value which defines the stability of the overaall system.

    #43409 Reply
    RF Engr
    Guest

    I think we add 110 in UL-DL value.
    Also explain in detail what should be the mean value of this and the standard deviation

    #43410 Reply
    t28
    Guest

    hi guys,

    there is nothing the same between path balance and link balance.
    RF link balance=DL level-UL level.
    superb value (900 DRX)is 2.5, or 12.5 in case of LNA, on 1800 DRXs good value is about 4 – 5.

    #43411 Reply
    BlessCurlz
    Guest

    Path Balance:
    The method used analyzes downlink vs. uplink path balanced path and reliability (based upon lognormal fading). The contour limit becomes the received signal level set to balanced path conditions with the appropriate reliability. It is dependent upon a number of factors, including: tower height,power,combiner, and receive sensitivity.

    #43412 Reply
    John
    Guest

    Path balance = (ul losses – dl losses) + 105

    where 105 is the optimum value for the path balance

    in case of -ve path balance this means the dl losses is greater which means a tx calibration for the bts is needed (adjust tx power)

    and in case of +ver path balance this means the ul losses is greater which means a rx calibration is needed to adjust the sensitivity of the rx of the bts

    #43413 Reply
    nall
    Guest

    please advise on a project to carry to test the Parameter settings of Motorola BTS n Ericsson BTS !

    #43414 Reply
    Pix
    Guest

    John,

    maybe we don’t calculate the path bal in the same way. “my” path balance is centered around 0..

    path balance < 0 means losses in the UL (poor UL RX) path balance > 0 means losses in the DL (weak DL TX)

    path bal = (Pow(TRE TX) – RXLEV(DL)) – (Pow(MS TX) – RXLEV(UL))

    #43415 Reply
    Mohan
    Guest

    Good article for Huawei path balance.

    hubpages.com/hub/Path-Balance-in-Huawei

    #43416 Reply
    Eng
    Guest

    Hi guys 🙂

    Understood, that if your unbalance value close to ZERO then it is OK.
    But what is permissible value of unbalance between UL&DL?
    From which value will strong problem with KPIs begin?

    Please, share. Thank you)

    #43417 Reply
    pix
    Guest

    eng,

    typically, path balance should be between -5dB and +5/+8dB

    but when the PB is outside these values, sometimes you won’t see a problem. KPI remain fine because the neighbours will handle areas where the loss of coverage happens.
    Typically, in urban areas, the overlap with the neighbours is good enough -> a site with bad PB will still have good KPI.
    But you will notice that the neighbours are handling traffic which is outside their “comfort” zone, and that they are having some KPI issues (sometimes).

    Regards
    pix

    #43418 Reply
    jalloul
    Guest

    What about Power Control when calculated Path Balance ?

    #43419 Reply
    pix
    Guest

    the attenuations caused by power control should not be taken into account in the calcul, for best restuls.

    In ALU, they are removed from the computations.

    In E/, they are not, so one must either disable the PC during the MRR recording, or take into account the MS Pwr and BS Pwr graphs when looking at the Path Balance graph.

    Cheers,
    pix

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