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Sharing TCH among TRX (low utilize cell)

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  • #68019 Reply

    Hi Experts,

    If we have 20% traffic utilization for a certain cell, does all TRX (example for 6 trx) will have traffic or some will not?
    What is the factor for TCH assignment?

    Please help.

    #68020 Reply


    it is a vendor-specific algorithm, so there is no global rule. The most logical way of distributing traffic is to allocate it TRX per TRX. So if you have only 20% of traffic over 6 TRX, only 2 of them will be used most of the time.


    #68021 Reply

    Thanks Pix for reply.
    I’m using ALU B10. If using BBH, can traffic distributed among TRX even in low utilization?

    #68022 Reply

    no, because bbh in ALU is not really a baseband hopping. A call is put (and stays) on 1 TRX, and this TRX modifies its frequency every TDMA frame. In other words, BBH in ALU is working as SFH.

    The only ways to push traffic to other TRX are:
    1/ modify the TRX PREF MARK
    2/ lock the other TRX


    #68023 Reply

    Hi Pix,

    Thanks for the good info. Now I know why some trx not carried trafic even we using BBH. Another query,without remove/lock non traffic TRX on low utilization cell, how can we modify the TRX PREF MARK to make the traffic distributed to non traffic TRX?
    Here current setting:
    TRXs (+) TRX PREF MARK zone type
    TRX 01 0 Outer
    TRX 02 0 Outer
    TRX 03 1 Inner
    TRX 04 1 Inner
    TRX 05 1 Inner
    There is no traffic for TRX03. Can I modify TRX PREF MARK to make TRX03 can carry some traffic?
    For info, our management directions to let non utilize TRX on site with carry some traffic.

    Pls help.

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