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Power Control on BCCH TRX

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  • #67724 Reply
    prof
    Guest

    1. When we say that power control is disabled on BCCH TRX. Does it mean all 8 time slots of BCCH TRX or only 0th time slot?

    2. Suppose time slot 6 of BCCH TRX is defined to be TCH. What if this time slot is idle? Will the BTS transmit some dummy data or will it remain silent?

    3. Do we have power control enabled in the uplink on BCCH TRX time slots?

    #67725 Reply
    pix
    Guest

    hi prof,

    1/ it means that the DOWNLINK PC is disabled on ALL the 8 timeslots of the BCCH TRX. The principle is that the BCCH frequency in DL should always be emitted at max power.

    2/ it will transmit dummy data at max power (btw, DL DTX is disabled on BCCH TRX as well, for the same reason)

    3/ yes, UL PC works the same on all TRX.

    Cheers,
    pix

    #67726 Reply
    BT
    Guest

    @pix

    2/ The BTS will remain silent in idle mode because there is no communication with the mobile device.

    #67727 Reply
    prof
    Guest

    Thanks pix and BT.
    I see a little debate on my 2nd question. Can there be an agreement?

    #67728 Reply
    pix
    Guest

    prof,
    indeed there is a disagreement… but i hope you know who to trust 😉 i would always tell if i’m not sure about something…

    … but here, i know *for sure* the BTS transmits dummy blocks on the BCCH carrier in downlink when there are no actual calls. that’s one of the reason why the bcch frequency needs a “cleaner” frequency planning. And that’s also a reason why BCCH frequency is the one which is NOT hopping in SFH hopping mode.

    regards
    pix

    #67729 Reply
    BT
    Guest

    @pix

    And how is possible that tracing my phone in idle mode I do not see any dummy data?

    What are you using to trace this dummy data?

    #67730 Reply
    pix
    Guest

    BT,

    well, you are actually seeing it : it’s thanks to this “dummy signal” that your ms is able to measure the dl_rxlev(serving) in idle mode, and to measure the dl_rxlev(n) in dedicated mode.

    it might not be “dummy blocks” at layer 3, but perhaps just a pure sinus signal. I don’t know those details.

    regards

    #67731 Reply
    paraHO
    Guest

    I agree with you Pix

    GSM 0502

    #67732 Reply
    pix
    Guest

    give me five !

    #67733 Reply
    BT
    Guest

    Yes 🙂

    #67734 Reply
    prof
    Guest

    thanks you pix/all.

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Reply To: Reply #67731 in Power Control on BCCH TRX
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