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PLz Help

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  • #55542 Reply
    Awacs
    Guest

    What’s the difference between BCH TRx and TCH TRx in GSM?Are they seperate radios in a given cell?Your help will be much appreciated..Thanks

    #55543 Reply
    adcguy
    Guest

    Hmmm……well, suppose there are 2 TRXs under a BTS, then, for obvious reasons BCCH will be on, say TRX0, and TRX1 will hv all the remaining TCHs. So in this case TRX0 is a BCCH TRX while TRX1 is a TCH TRX. But it should not matter though, except for some extraordinary behaviour!!

    #55544 Reply
    Awacs
    Guest

    Thanx adcguy….But in a frame, we have 8 timeslots,you are right that 0 is BCH and rest are for TCH.But sometime BCH and TCH ARFCN are same,I have still the same question…BCH and TCH TRX are seperate antennas?

    #55545 Reply
    adcguy
    Guest

    Awacs, remember that GSM is a TDM access method, so on the BCCH ARFCN, there will be 8 TS which are TDMed, and one of them is BCCH, and the remainging 7 is the TCH. All this is very abstract and its a bit difficult to understand. U can google GSM TDM frames and get some pictorial info so that u will understand it better(difficult to explain in words).

    So if you go by this logic, 2 TRXs will have 2 ARFCNs, and they use a duplexer or something and radiate using the same antenna.

    Other members can probably explain better:))

    #55546 Reply
    Pix
    Guest

    ADCGuy,

    Your explanation is amazing !

    Awacs,

    BCCH TRX is just a nickname used to describe the first TRX of a cell, which carries the BCCH on the first timeslot.
    This TRX is a bit special because it always emit (even when there’s no call on it) during all timeslots, and there is no power control : it emits at full power all the time.

    Regards,
    Pix

Viewing 5 posts - 1 through 5 (of 5 total)
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