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Alcatel concentric cell

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  • 11th October 2011 at 07:47 #67359
    New_boy
    Guest

    Hi all,
    I have a problem. I have a concentric cell with Half Rate for DCS and GSM.
    But even though i have high call congestion.The traffic is higher in the outer zone. How can i move the traffic in inner zone.
    RXLEV_DL_ZONE=-92
    RXLEV_UL_ZONE=-102
    ZONE_HO_HYST_DL=18
    ZONE_HO_HYST_UL=18
    Which of the parameters should i changed and what will be the value.

    11th October 2011 at 09:55 #67360
    pix
    Guest

    try
    RXLEV_DL_ZONE=-92
    RXLEV_UL_ZONE=-102
    ZONE_HO_HYST_DL=16
    ZONE_HO_HYST_UL=13

    it should be better.

    how much is your offset margin inner ?
    your mstxpwr_max, bs_txpwr_max and bstxpwr_max_inner ? (i’m not sure about the names anymore, i hope you’ll understand what i’m looking for 🙂 )

    regards
    pix

    11th October 2011 at 11:42 #67361
    New_boy
    Guest

    OFFSET_HO_MARGIN_INNER=10

    Is it good to try with:
    RXLEV_DL_ZONE=-92
    RXLEV_UL_ZONE=-102
    ZONE_HO_HYST_DL=16
    ZONE_HO_HYST_UL=16

    In this way can i move the traffic in the inner zone and eliminate the call congestion.

    11th October 2011 at 12:59 #67362
    pix
    Guest

    new boy,

    well, i don’t know why you want to use 16 instead of 13 as I suggested, but yeah, go ahead.

    also, ensure that:
    En_better_zone = enable
    to allow outer->inner zone HO

    EN_LOAD_BALANCE = disable
    to allow the inner zone to be fully loaded.
    that will create some artificial congestion in “HO_cong_%” but it’s not degrading the qos, it’s just an artefact 🙂

    regards

    11th October 2011 at 13:36 #67363
    New boy
    Guest

    OK pix,thnks.
    But i want to ask you something:
    if i make
    ZONE_HO_HYST_DL=20
    ZONE_HO_HYST_UL=20
    what will be the effect?
    Is it possible to creat more Blocking?
    And if i make this parameter higher then what will be the effect?
    Thank you very match

    11th October 2011 at 13:49 #67364
    pix
    Guest

    new boy,

    with zone_ho_hyst = 20, MS can barely enter the inner zone.
    the condition to enter the inner zone is :
    Rxlev(DL OUTER) > RXLEV_DL_ZONE + ZONE_HO_HYST_DL

    AND

    Rxlev(UL OUTER) > RXLEV_UL_ZONE + ZONE_HO_HYST_UL + 3dB

    you shall not go below an hysteresis of 12dB, otherwise there will be ping-pong.
    higher than 18dB – and the probability to have enough rxlev to enter the inner zone becomes very thin ! so yes, with 20dB you will create more blocking.

    regards
    pix

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