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Freq Planning

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  • #53174 Reply
    Learner
    Guest

    I hv got 6.2 Mhz of freq spectrum.
    Can someone suggest how can I plan the Freq Hopping in the system. i.e how many freq for BCCH & TCH.What will b the MA List & how to plan MAIO.

    #53175 Reply
    pix
    Guest

    hello,

    6.2MHz = 31 ARFCN, correct ?
    3 sectors per sites
    1 TRX “bcch” per cell
    now, let’s assume :

    freq reuse = 12 for BCCH –> 12 freq. are reserved for bcch only.
    1 guard band channel
    there are 31 – 12 – 1 = 18 ARFCN left for TCH
    assuming a freq reuse of 9 for TCH (quite aggressive), it means you can put 2 additional “tch” TRX per cell.
    So altogether : 3 TRX per cell max.

    this is without hopping.

    activating BBH will give you little bit more room to place your frequency, so once in a while you can put more than 3 trx in a cell.

    with SFH :
    18 ARFCN for tch trx
    assuming a 1×1 reuse and a max radio load of 12%, it gives you a max number of trx per cell of 2.16.
    –> an average of 3 trx / cell (1 bcch + 2 tch), and once every 6 cells, you can move up to 4 trx.

    The maio is useful only in SFH, and it’s easy to plan. Just avoid identical or adjacent MAIO between TRX within the same BTS. And don’t forget to use the same HSN within the cells of the same BTS. And different HSN between different BTS.

    regards,
    pix

    #53176 Reply
    syed sajjad sattar
    Guest

    which ARFCN is allocated to U-FONE Pakistan.
    waiting for reply.

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