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RXTA- RX Level Based TCH Access

  • This topic has 5 replies, 1 voice, and was last updated 15 years ago by Bijoy.
Viewing 6 posts - 1 through 6 (of 6 total)
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  • 17th November 2009 at 13:26 #59674
    naeem ahmed
    Guest

    hi,
    can any of you please share technical description on RX Level Based TCH Access.

    18th November 2009 at 04:49 #59675
    Bijoy
    Guest

    Naeem
    In the RX level based TCH allocation method the downlink RX level measured by the MS is used to determine whether the BTS is acceptable for TCH allocation. . TCH allocation for emergency calls is not restricted because of a too low RX level.
    The minimum allowed RX level per call type is calculated as in the equation

    DL_Rx_Lev(min)=C/N + DL noise level + NBL + 110.

    If a downlink RX level measurement is not present, it is assumed that all call types on BCCH BTS are allowed and RX level is calculated by using the highest C/N value as in the equation

    DL_Rx_Lev=C/N(max) + DL noise level + NBL + 110.

    Br\\
    Bijoy

    18th November 2009 at 08:52 #59676
    naeem
    Guest

    hi bijoy,

    DL_Rx_Lev(min)=C/N + DL noise level + NBL + 110.

    1)does NBL mean NON BCCH LAYER?
    2)For implementing this in BSC do i just need to change the value of RXTA=1 or 2 or is there any additional paramenters do i need to change.
    3) doest it have any relation to RXP(Rx-Levl min acess).
    3) does this parameter give any improvement in TCH Drop.

    18th November 2009 at 10:20 #59677
    Bijoy
    Guest

    naeem
    1.Yes,it is Non-BCCH Layer Offset
    2.Nothing
    3.DL_Rx_Lev(Min) >= RXP
    4.Not as such,But improper settings may increase SDCCH Drop & HFR.

    19th November 2009 at 06:30 #59678
    naeem
    Guest

    hi bijoy,
    1) can u plz clarify why SD drop will effect.
    2) if RXTA=1, then DL RX_lev is used in call setup only and it has nothing to do with SD Drop and HSR.

    19th November 2009 at 07:21 #59679
    Bijoy
    Guest

    Naeem
    This feature is used only for TCH allocation & not for SDCCH.
    So,if your Rx_Lev of TCH is lower than DL_Rx_Lev(min),your SDCCH will get released(T3101 expiry).

    If your SDCCH Drop rate includes T3101 expiry,you will observe huge SDCCH Drops Rate.
    Since you have set RXTA=1,no impact on HOSR.
    But if you keep RXTA=2,your HO may get dropped if it doesn’t meet the DL_Rx_Lev(min) criteria and no other suitable neighbour cells.

    Got it??
    Br\\
    Bijoy

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