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Mobile Network Design

Viewing 15 posts - 1 through 15 (of 16 total)
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  • 31st January 1999 at 12:27 #32328
    Annchoon Pan
    Guest

    Hi,

    I need to calculate the trunks capacity/allocation from the BSC to the MSC base on the BTS traffic capacity. I also need to know how the traffic from the BTS is groomed and transported to the MSC.

    Pls give me your advise or direct me to any useful web site.

    Thanks.

    my e-mail address: enjun@usa.net

    10th May 2000 at 16:01 #32329
    Bill
    Guest

    Good Day,
    We have establish a SOA network in the Northeast. What are you using for your trunking controllers? Are you using your repeaters for Voice only , data only or a combination of bot?

    18th September 2008 at 17:12 #32330
    kk
    Guest

    please i’ll like to know the maximum traffic a bts can carry.
    contact me on rafflinks@yahoo.co.uk

    18th September 2008 at 17:36 #32331
    pix
    Guest

    it depends on the number of TRX in the BTS.
    an alcatel lucent bts can fit 24 TRX, therefore it can carry up to 168 calls at once in full rate, and 336 calls in half rate. I’ve never tried that myself though 🙂
    in terms of erlang, that’s about 150 erlangs FR, or 300 erlangs HR.

    23rd September 2008 at 08:21 #32332
    kk
    Guest

    does anyone have an idea on the mathematical relation between the offered traffic and the carried. pls let me know or you can direct me to websiste

    23rd September 2008 at 09:40 #32333
    pix
    Guest

    http://www.erlang.com/calculator/

    the formula is quite complex.

    24th September 2008 at 07:36 #32334
    RH
    Guest

    Carried Traffic = Offered Traffic*(1-Grade of Service)

    Where Grade of Service refers to the Probability of Blocking.

    24th September 2008 at 11:41 #32335
    Mahesh
    Guest

    hello,i want to know at which position in the Syn burst BISIC is present??& why??can somone help me

    24th September 2008 at 12:45 #32336
    pix
    Guest

    in gsm, the sync burst does not contain the BSIC.

    RH > good one 🙂 i misunderstood the question (misread, actually)

    25th September 2008 at 05:11 #32337
    Mahesh
    Guest

    Hello pix,thanx a lot for ur reply,actually i am new in gsm ,could u pls explain me this.

    25th September 2008 at 07:56 #32338
    pix
    Guest

    hello,

    the BSIC is transmitted in BCCH blocks, not in the SCH blocks.
    the SCH contains only a “beacon” signal so that mobiles can re-synchronize with the BCCH frequency.

    If you’re new to GSM, you should just google “GSM tutorial” or “GSM explanation”, because it’s a rather vast topic.

    Regards,
    pix

    25th September 2008 at 12:26 #32339
    fedem
    Guest

    Hi Pix,
    sorry but I dont agree.
    According to spec 45.002 par. 3.3.2.2.1,
    the BSIC is encoded in the SCH.
    Regards,
    Federico

    26th September 2008 at 12:42 #32340
    pix
    Guest

    yes, sorry for the mistake and thx for correcting.

    what a coincidence, i’m just reading this chapter too 🙂

    1st October 2008 at 09:39 #32341
    Mahesh
    Guest

    Hi Pix

    coud u give me idea about the exact position of bisic in sch

    1st October 2008 at 10:00 #32342
    pix
    Guest

    hello mahesh,

    for this kind of question, you should download these documents:

    http://www.3gpp.org/ftp/Specs/html-info/44-series.htm

    44.006 and 44.018 specify the precise bit ordering

    http://www.3gpp.org/ftp/Specs/html-info/45-series.htm

    45.002, chapter 3.3.2.2.1 Synchronization channel (SCH) description

    45.003 the channel coding of the SCH

    45.010 defines how the TDMA frame number can be calculated from T1, T2, and T3′

    i’m sorry, i don’t know the details for those channels because it’s totally useless for optimization 🙂

    have fun 🙂

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