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rx_lev threshold for intracell HO

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  • #56727 Reply
    RQ
    Guest

    What should be the value for the rx_lev threshold for intracell handover for uplink and downlink (u_rxlev_ul_ih / u_rxlev_dl_ih)?

    In our network its value is 30 (-80 dbm).Is it not high enough? I mean when there will be poor quality(quality worse then the threshold) and the rx_level for the serving cell is greater then -80 dbm it will always try for intracell handover.So by giving this value (-80 dbm) we are reducing the chance for quality based inter cell ho.Should I reduce it (for example default value is 45.i.e. -65 dbm)?…what is the drawback and benefit of using -65 dbm or -80 dbm if that network has lots of interferences(both in hopping and BCCH)
    Any body please suggest the value for this threshold….

    #56728 Reply
    RQ
    Guest

    Any 1 can help me please about that issue?
    thanks

    #56729 Reply
    TNS
    Guest

    Hi,

    -65 dBm is oK.
    It’s useless in case of hopping.

    BR,

    #56730 Reply
    RQ
    Guest

    Hi TNS,
    Can u please describe why does it useless in case of hopping as u mentioned.
    thanks

    #56731 Reply
    RQ
    Guest

    hellow…………..
    by giving the threshold to -80 dbm I think we are giving more priority to the intracell ho.
    So I think I should increase it like (-65 dbm)

    #56732 Reply
    TNS
    Guest

    Hi,

    So, this is the idea…

    Let’s say you have two TRXs with BCCH freq 20 and TCH freq 35.

    Without BBH you get a TCH on freq 35. Very good level -60 dBm but low quality => interference.
    Then the BSC assign you a TCH on the BCCH TRX ( freq 20 ). There you have the same level but better quality due to clear BCCH freq.

    With BBH you get a TCH on the TCH TRX. Very good level but bad average quality due to very bad freq ( BCCH 20 or TCH 35) or both.
    You perform a intracell HO and you get a TCH on the BCCH TRX. The same level again, but the same quality because of the average value on the hopping sequence ( freq 20 and freq 35 ).
    Then you perform a new intracell HO and again… and again…
    A loop with unknown end :- )

    Of course performing this HO we keep the freq band ( it’s not inner zone to outer zone HO and vs… ).

    BR,

Viewing 6 posts - 1 through 6 (of 6 total)
Reply To: rx_lev threshold for intracell HO
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