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  • This topic has 2 replies, 1 voice, and was last updated 17 years ago by davidt.
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  • #38046 Reply

    could you please any one let me know where the BSIC is used

    #38047 Reply
    Daniel Dong

    BSIC: Stands for Base Station Identity Code which is
    transmitted on the SCH. It is expressed as:
    NCC = National Color Code of PLMN. Numeric 0 – 7.
    BCC = Base Station Color code. Numeric 0 – 7.
    Each operator in a country is assigned one NCC value n to
    ensure that the same NCC is not used in adjacent PLMNs. The
    purpose of the BSIC is to distinguish between cells with the
    same carrier frequency but from different clusters. It can also be
    used to distinguish between cells from different operators at the
    border between two countries. It is essential for the locating
    algorithm that the correct neighboring cells are evaluated.

    #38048 Reply

    Actually, an operator in a country can use any BSIC/NCC and should do so except where there is possibility of overlap with co-channel border PLMNs.

    You will have to adjust the ‘NCC permitted’ or ‘PLMN permitted’ (whatever its called in your BSC)parameter accordingly at those border cells.

    You can use the all NCCs including those of any other non-cochannel operator in the same region too without any problem.

    If you use the same single NCC everywhere in your network then you are likely to get co-BCCH co-BSIC neighbour of neighbour problems that appears to cause lots of HO failures.

    The NCC part of the BISC is one of the most misunderstood parameters. It is only used to prevent mobiles in co-channel PLMN border regions reporting BCCHs that don’t belong to the home network.

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