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BTS erlang

Viewing 15 posts - 1 through 15 (of 17 total)
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  • #44381 Reply
    vijender singh
    Guest

    i want to know about the BTS erlang . how it is calculated and how it effect the BTS. we are working on hyundai syscomm BTS.about the capacity of a BTS.

    #44382 Reply
    RF Learner
    Guest

    what is that.

    is it concern to TRX or anything else, i wanna know

    #44383 Reply
    neeraj
    Guest

    Hi vijendra,
    BTS erlang capacity depends on two factor:
    1-GOS that is grade of service
    2- no. of trx’s
    say a sector(bts) comprises of 3 trx’s one trx is as BCCH.

    NOW ACCORDING TO GOS=2% and Erlang B table -one trx means 8 channels as good as 8 trunks the erlang capacity is 3.63erlangs. now for BCCH TRX -2channels are used for signalling on Air intrface remaining is 6 channels now as per GOS=2% AND ERLANG b TABLE the traffic carrying capacity is 2.27erlangs.so two trx’s with 8 channels and 1 with 6 channels gives you the total erlang capacity of whol sector as 2.27+3.63+3.63=9.53erlangs……..
    I think that may clear your doubts

    #44384 Reply
    Fabio
    Guest

    Neeraj,

    Actually, if you have 3 TRX on a same sector (2 with 8TCH and 1 with 6TCH, as you mentioned) you’ll have 22 TCH wich gives you 14,9 erl (at 2%).

    And the calculation has others considerations like percentage of Half-Rate traffic, number and type of signalling channels, dedicated GPRS channels.

    But just as you explained, all we have to do is sum all TCH avaiable and look up the Erlang B table.

    Regards

    #44385 Reply
    shahnawaz
    Guest

    dear neeraj,

    by wat formula u calculated the earling for one TRX

    thnx

    #44386 Reply
    Tufail
    Guest

    Dear shahnawaz

    It is computed using Erlang B Table, tht is readily available traffic table..

    there v need 2 thing
    1. GOS
    2. No. of TCH available

    NO. of TCh =

    if u have 2 TRX with 1 Signalling TS. then u have 8+7= 15TCH

    take a look in erlang B Table and cal no. of erlang offered.

    Thanx

    Hope it will help
    TUfail

    #44387 Reply
    tufail
    Guest

    To shahnawaz

    for 15TCh total erlang comes out 9 erlang@2%GOS

    to Neeraj

    total no. of channel is 6+8+8 = 22Ch

    hence total erlang capacity = 14.85 @2%GOS

    thanx

    #44388 Reply
    Naveen Dankal
    Guest

    Hi,
    In the typical BTS/BSC specifications, the power consumption is given per TRX wise or around the total no. of TRX supported by that BTS…e.g. in one of the BTS specifications it is given:-

    no. of TRX 12
    Power consumed 3960 w

    #44389 Reply
    naveen dankal
    Guest

    Hi ,
    I would like to know what is affect on the power consumed if the number of TRX are increased in a partcular BTS configuration.
    Thanks,
    navs

    #44390 Reply
    Sunil
    Guest

    What is the Power and Voltage consumed by a Base Station Controller? If a rectifier is used for two two BSC’s, what are the design factors that needs to be considered?

    #44391 Reply
    nct
    Guest

    hi in a thumb rule what is the traffic carried out by 1 trx

    #44392 Reply
    lvin
    Guest

    hi
    please who can help me?
    as sample:
    in our statistics
    i have TCH congestion(15%),TCH availability(100),half rate (42%),TCH Traffic Erlang(11).
    the question is:
    why Erlang is little?
    so must Erlang more than 30 because we used RBS 2202.
    thanks..

    #44393 Reply
    Kina
    Guest

    Can any of you pls explain why do we have Prep fails on BSC level in Alcatel BSC, as i know prep fail normally occurs when ever DCS cabinet is down but it is for cell level, but i could not figure out why it happened on BSC level, as there is no alarm on any of the ater mux,nor any of the BSC card, pls help

    #44394 Reply
    lvin
    Guest

    hi
    please who can help me?
    as sample:for one cell.
    in our statistics
    i have TCH congestion(15%),TCH availability(100),half rate (42%),TCH Traffic Erlang(11).
    the question is:
    why Erlang is little?
    so must Erlang more than 30 because we have half rate.each cell have 4 TRx.we used RBS 2202.
    thanks…

    #44395 Reply
    pix
    Guest

    kina,

    prep failures during TCH assignment are usually caused by faulty BTS/BSC hardware, as you mentionned, or a problem of in the NSS.
    have you changed BSS release or NSS release (or path ?) lately ?

    if it happens to only one BSC, i’m keen to think it might be a problem in the BSC itself. Try to isolate exactly which cells have this problem : all cells of the BSC, or just the cells that share one specific TSU ?
    No omcr alarms doesn’t mean there is no problem with the board.

    Once you have isolated the problem, perform some A interface or Air interface traces, to see where exactly is occuring the issue (during which message ?). Then raise the issue to TAC 🙂

    regards,
    pix

Viewing 15 posts - 1 through 15 (of 17 total)
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