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BSIC Planning

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  • #50989 Reply
    Bilal
    Guest

    Hi,

    Can anybody explain how BSIC planning can impact Random Access Success Rate?

    #50990 Reply
    ARPAN
    Guest

    Try to use co-channel co-bsic as far as possible and in opposite directions.. it will reduce the probability of random access failure rate…

    #50991 Reply
    Pix
    Guest

    The BSIC of two cells should be different ONLY if they use the same BCCH.
    The TSC shall be equal to the BSIC.

    Finally, the impact of co BSIC and co BCCH : SDCCH Assignment failures (and or Random Access failures), HO failures, and possibly wrong decoding of TCH (interference) due to same TSC.

    One RACH sent to one cell will also be decoded to the other cells. Both cells will send an Immediate assignment, but only one will receive an answer from MS. The other one will count this as a sdcch assignment failure due to poor radio (alcatel systems).

    Regards,
    Pix

    #50992 Reply
    BILAL
    Guest

    So if we have 15 BCCHs and 64 BSICs, having unique combination of BCCH and BSIC for every cell in an area can never be problem. Am i right?

    #50993 Reply
    Pix
    Guest

    You don’t have 64 BSIC’s, because BSIC = NCC & BCC. The NCC is the network country code, which was allocated to your operator by the telecom regulation agency. Normally, you have only 1 or 2 NCC’s (right ?). Then you have only 8 BCC’s to play around with (from 0 … 7)

    But still : this is plenty enough to avoid problem.

    #50994 Reply
    Bilal
    Guest

    What is the point in having different NCC’s for different networks in a country? As we know that every operator has different band of frequencies so there is no chance of co-BCCH-BSIC across the operators. Anyways in our country every operator is using all available NCC’s and BCC’s i.e. 0-7

    #50995 Reply
    Pix
    Guest

    Bilal,

    yes, you’re right… i don’t know why the NCC should be unique, it’s something i took for granted, but your explanation makes much more sense.

    #50996 Reply
    MKT
    Guest

    In countries like India the license is given on state basis, not a single
    license to operate throughout the country. One license area normally corresponds to one state.Hence in neighboring states the same operator
    (same BCCH frequencies)situation can
    exits. This is common at state borders.

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