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EDGE/GPRS on BCCH

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  • #54655 Reply
    Fahim
    Guest

    Is there any drawbacks associated with enabling edge/gprs in the TRX which carries BCCH ?

    In my Alcatel system all are so defined by default – any suggestion ?

    #54656 Reply
    pix
    Guest

    it’s a good setting to prefer the GPRS on BCCH. It means that the first PDCH are allocated on the BCCH TRX first, and then if more PDCH are needed, they’ll be allocated on the other TRX.

    The BCCH is better because of:
    – better frequency planning (usually)
    – no DL power control / no DL DTX

    #54657 Reply
    Fahim
    Guest

    Hello Pix,

    Lately I had been trying to find out more info about this issue.

    In 3GPP TS 05.08 version 8.23.0, particulalry in section 7 it has been said that if 8PSK is used in BCCH carrier then cell selection, reselection and HO procedures invloving these cells will be somewhat sub-optimal.

    If you have time could u plz check it out.

    #54658 Reply
    pix
    Guest

    Fahim,

    Sub-optimal because the BCCH carrier will send some timeslots in GMSK (max power) and other timeslots in 8PSK (with a power which is a bit less than GMSK).

    So neighbours MS will measure this particular with a level which is somewhat lower than reality. (measurements are performed on any timeslots of the BCCH carrier, not the TS0 only)

    Usually, the delta between GMSK and 8PSK is less than 2dB… it’s somewhat acceptable 🙂

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Reply To: EDGE/GPRS on BCCH
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