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# of TRX a LAC can carry

Viewing 14 posts - 16 through 29 (of 29 total)
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  • #58024 Reply
    ashraf
    Guest

    hello guys,
    Pls, explain onee thing. as i know paging retransmitts for all cells in bsc. How could it be that number paging commands for bsc/per hour is different from number of paging comands for one cel/per hour in this bsc?
    Thank in advance

    #58025 Reply
    Pix
    Guest

    Are you both looking at hourly values ?? I’m amazed by this number of 3 millions !!
    I’m checking it out right now.

    One thing : the numbers I have given you are MAXIMUM capacity, not 60%. Sorry for my mistake.

    #58026 Reply
    Pix
    Guest

    If MC8A is different between cells within same LAC, 3 possibilities:
    1/ MC8a have some problems
    2/ corrupted BSC database: try changing your LAC ID to another number then back to the initial value (for all cells in the LAC)
    3/ wrong CELL / BSC / LAC mapping in the MSC
    4/ MSC paging method is done based on CELL LIST IDENTIFIER containing certain cells only, and not the whole LAC.

    Good luck…
    I can’t really help you more than that, you should ask help from your local ALU support.

    Cheers,
    Pix

    #58027 Reply
    Abdel
    Guest

    how can i calculate the load of my paging using the below indices.
    paging messages=80,000 per hour
    Number of AGCH blocks=2
    Multiframes PCH=5
    I got this formula from a book
    =======================
    CAPACITY of PAGING CHANNEL
    Combined BCCH: YES
    Blocks for Access Grant:1
    Number of Pages/Block:3

    Max. Capacity: 25 pages / sec
    91915 Pages per Hour
    =============================

    #58028 Reply
    Abdel
    Guest

    I get some info,plz confirm

    1. combined bcch has 3 CCCH blocks
    2. noncombined bcch has 9 blocks.
    3. In our network i have 2 agch blocks and 5 for pch a total of 7 blocks,therefore can increase the PCH from 5 to 7 cuz i have still 2 CCH blocks left for me?
    4.This is how i did to calculate the PCH load, (in the cell parameter the load threshold for pch is 60)
    =========
    paging times per hour=80,000
    PCH blocks=5
    length of a single frame=235ms
    TMSI or IMSI paging: TMSI paging

    5 pch blocks X 3 paging messages per block=15 paging messages/235 ms
    64 paging messages/second
    230,400 messages per hour

    60% load X 230,400=138,240 per hour.

    I think I still get some paging space for this lac?

    #58029 Reply
    Abdel
    Guest

    In the Paging request message i got both the IMSI and TMSI and in the paging response i got only TMSI, I thought that if TMSI paging is activated at MSC side then in the paging request only the TMSI must include, why there is an IMSI too???!

    #58030 Reply
    Pan
    Guest

    Dear, Abdel!
    Paging request may identify several MS. Perphaps these Ids belong to different MS?

    #58031 Reply
    Abdel
    Guest

    No i have only two IDs, by the way i thought when TMSI is activated then IMSI can not be traced from A interface is this right. What i have seen it is that i put trace on my imsi and i see a pag_req with both the imsi i am tracing and a a TMSI.

    #58032 Reply
    Pan
    Guest

    Abdel, sorry – you are saying about A-interface but I am – about radiointrfc. Paging message on A-interface is related only to one MS. This message contains IMSI as mandatory parameter and TMSI if MSC wishes to page on IMSI. IMSI is used by BSS for e.g. paging group calculation in DRX-mode. See Paging message format in 08.08.

    #58033 Reply
    Pan
    Guest

    mistake:’wishes to page on IMSI’ = ‘wishes to page on TMSI’

    #58034 Reply
    Abdel
    Guest

    thanks pan, i traced the radio interface and i got the tmsi paging there is no imsi available.

    #58035 Reply
    Askari
    Guest

    Dear Ashraf,
    For your question of different cells having different Pagings.

    Two more possibilities could be (provided you have GPRS enabled).

    1. Cells in same LAC are in different RAC as the MS are paged per RAC + LAC basis. or
    2. Packet paging is disabled on some cells / BSCs.

    #58036 Reply
    Ankit
    Guest

    Hello Sir,
    I want to know that in bts where we use the TSDA.
    What is the main difference between TSDA & TSDB.
    Please clear my confusion.
    Thanks.

    Regards.
    Ankit

    #58037 Reply
    jose Lukanda kasongo
    Guest

    i have 14 frenquency in my Frequency hopping set.
    I want to implement hopping synthsis 1/1
    somme one can help me to do the MAIO planning?

Viewing 14 posts - 16 through 29 (of 29 total)
Reply To: Reply #58028 in # of TRX a LAC can carry
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