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different LAC for BTSs from the same BSC

Viewing 8 posts - 1 through 8 (of 8 total)
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  • #61409 Reply
    campus
    Guest

    hi,
    Cells from the same BSC having different LAC could that be a problem??

    #61410 Reply
    Pix
    Guest

    hello,

    no problem, but watch the A interfaces from MSC to BSC, and the BSC processing capacity : the N7 will bring 2x more Paging messages to the BSC.
    1 LAC for 1 BSC : only pagings for that LAC goes through A interface
    2 LACs : twice more pagings must be carried by N7 and processed by BSC.

    #61411 Reply
    Ds
    Guest

    Hi Pix,

    can u tell something more about N7.what is this?

    Thanks in advance

    #61412 Reply
    pix
    Guest

    N7 : there is a “N7” TS on the A interface (BSC – MSC) that carries all the “N7” signalling 🙂
    this signalling is used to carry call setup information (Authentication, Ciphering, Calls Numbers, Handover Messages, etc)

    1 N7 Timeslot can take care of 120 calls.
    The call itself (the TCH if you prefer) is carried by another A nterface timeslot, which is called the “CIC”)

    Cheers
    pix

    #61413 Reply
    campus
    Guest

    pix you are an angel thanks a lot

    #61414 Reply
    Ds
    Guest

    Thanks Pix.

    #61415 Reply
    Taib
    Guest

    Hi Pix,

    I dont think there will be twice number of pagings, as the LAC size will be halved, so the MS present in each LAC will be almost halved assuming the 2 LAC areas are of same size. The bottomline is that the number of paging will be same in the whole BSC as the MS present will remain same.

    #61416 Reply
    pix
    Guest

    taib,

    yes, you are totally right. why did I say something so stupid ?

    Maybe I meant to describe the case where the LACs are shared among several BSC… = the case where the size of the LAC doesn’t depend on the size of the BSC.

    1 LAC is spread over several BSCs -> 1x pagings over n BSC.
    2 LACs = 2x pagings.

    Cheers (and thanks for the correction !!)

Viewing 8 posts - 1 through 8 (of 8 total)
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