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IDLE vs DEDICATED Rxlevel

Viewing 4 posts - 1 through 4 (of 4 total)
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  • #54299 Reply
    MKT
    Guest

    Hi,

    When you are having a good Rxlevel in a cell( -55 dBm or so) for the BCCH carrier.

    AND

    when you initiates a call
    (naturally the first phase will use the BCCh frequency only until SDCCH gets assigned to the MS)…the Rxlevel are still same as that was in the IDLE case..

    BUT

    the moment TCH is assigned and it is hopping now…

    the Rxlevel jumps to the ranges between -80dBm to -90dBm????

    Why????

    This is not binded to a single cell rather it is with all the cells ….

    Thus without even bothering to test the hardware i am declaring that the hardware for the hopping TRX’s is OK.

    And if a feeder/jumper/antenna can work fine with BCCH then why not with other..ARFCNS!!!

    Finally…

    Give me advice to pick the parameter at cell level which is the root.

    Regards

    #54300 Reply
    pix
    Guest

    it’s a very common problem.. it has nothing to do with parameters.

    It’s just that the TRX that carry the TCH on which you’re going is being transmitted on a different sector. This is a cross-cable situation.
    I assume you’re using one X-polar antenna per sector? There are two feeders per X-pol antenna. So if you send the BCCH feeder on the correct sector, but the TCH feeder on another sector, you’re going to experience exactly what you’re seeing now in your drivetest.

    That, or the “TCH” TRX is faulty (low TX power). Check the path balance of this TRX to rule that out.

    #54301 Reply
    dadabe
    Guest

    Hi,
    Are you already verify your cabling.
    Regards
    dadabe

    #54302 Reply
    QIP
    Guest

    are you watching RXlev sub or full?

    do you use downlink power control?

Viewing 4 posts - 1 through 4 (of 4 total)
Reply To: IDLE vs DEDICATED Rxlevel
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