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Paging group calculation

Viewing 14 posts - 1 through 14 (of 14 total)
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  • #53563 Reply
    somnath dutta
    Guest

    With some IMSI value,CCCH_CONFIG=0,BS_AG_BLK_RES=1,BS_PA_MFRMS=4,how to calculate the actual paging group?I want the actual value of the paging group.Plz help.

    #53564 Reply
    Garry
    Guest

    32 paging groups with non combined and 8 with combined.

    #53565 Reply
    somnath dutta
    Guest

    No I want the actual paging group which is assigned for me.That means how to calculate the actual paging group based on my IMSI/TMSI which is assigned to me.

    #53566 Reply
    pix
    Guest

    there’s a formula, that you can find in a 3GPP document.
    http://www.3gpp.org

    #53567 Reply
    somnath
    Guest

    Actually I have tried to calculate the same using that formula…but there Im facing some prob where mod value is returning a ‘0’…which is meaningless…so I feel Im doing some mistake somewhere.So can you help?

    #53568 Reply
    pix
    Guest

    yes, but you’ll have to give me the formula, so i can give it a try. No time to look for the formula by myself, sorry…

    #53569 Reply
    somnath
    Guest

    pagging_group(0….N-1)= (IMSI mod 1000)mod N

    N=(no of CCCH group in a multiframe-no of blk for AGCH)*no of multiframe between pagging
    for instance no of CCCH blk available=9,AGCH blobked=1,
    no of pagging between multiframe=4

    plz help

    #53570 Reply
    pix
    Guest

    IMSI mod 1000 –> gives you the 3 last digits of the IMSI

    3 last digits mod 48 –> in excel, type the formula
    “=MOD(3digits;48)”

    why 48 : because (9-1)x4 = 48

    the result is the value of the paging group…

    regards,
    pix

    #53571 Reply
    somnath
    Guest

    It will be 32 instead of 48 because
    (9-1)*4=32

    #53572 Reply
    pix
    Guest

    what a shame… thx somnath, i’m doing really stupid mistakes sometimes ! :))

    i was even wondering how come a “modulo 48” was used, while there is about 20 to 30 paging groups normally… never crossed my mind that 8×4 = 32.

    #53573 Reply
    anh
    Guest

    Let say, we have 100 IMSIs belonging to paging group No.2
    With paging request type 3 (4 MS per paging msg), how will these 100 IMSIs be paged?

    Thanks,

    #53574 Reply
    pix
    Guest

    hi,
    these Ms will be paged by their TMSI, if the MSC has allocated a TMSI to these MS, and if the “TMSI paging” method is defined in the MSC.

    If anyone has more info, welcome to share…

    regards
    pix

    #53575 Reply
    Mick
    Guest

    In case of Paging Request Type the mobile stations are identified by their TMSIs (TS 04.08)

    #53576 Reply
    Deepak
    Guest

    CCCH-CONF Value tells,Whether you are using COMBINED or NON-COMBINED Configuration.
    I dont remember exactly, What exactly CCCH_CONFIG=0 stands for.

    First lets Consider COMBINED config

    COMBINED : Total CCCH = 9
    BS_AG_BLK_RES=1
    So Channels reserved for Pagig = 9-1 = 8

    BS_PA_MFRMS=4 : This tells After how many multiframes paging group repeats.

    So total Paging groups = 8*4 = 32

    Lets IMSI Value = x

    Paging Group for a particular Mobile =

    (x MOD 1000) MOD 32 where 32 is total Paging Groups.

    e.g. if IMSI = 404685505601234
    Paging Group = (404685505601234 MOD 1000)MOD32
    i.e. => 234 MOD 32 => 10

    Paging Group = 10.

    NON-COMBINED:

    Total CCCH = 3
    BS_AG_BLK_RES=1
    So Channels reserved for Pagig = 3-1 = 2

    BS_PA_MFRMS=4
    So total Paging groups = 2*4 = 8

    Paging Group = (IMSI MOD 1000)MOD 8

    e.g
    404685505601234 MOD 1000 MOD 8
    => 234 MOD 8 = 2
    Paging Group = 2

    I hope this answers your query

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