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GSM basics

Viewing 15 posts - 121 through 135 (of 157 total)
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  • #34535 Reply
    pix
    Guest

    hi robbin,

    ok, now i understand better… maybe i can help.

    your software is supposed to work at a network level ?

    then let’s say you have the busy hour of the network.
    you need to introduce the notion of “area” in your software. Basically, this “area” concept include the covered area in your network and the density of site you’re planning to put (number of sites / sq. kilometer).

    You can also define different types of area (dense urban = high density of sites, etc..)

    Once you have the density of sites (this is give by the planning team and/or the tendering team), you can compute the average amount of TRX needed per site.

    However, let me tell you, your software will only provide you with an average needed capacity. If you want more detail, you need a planning tool, which uses not only the concept of “area” but also of “coverage”….

    I know i’m not very clear, but i hope to give you some leads here.

    #34536 Reply
    Chathura
    Guest

    Hi Robbin Coker,
    are you looking to calculate NW capacity by BH Traffic?, if so, it can be done easily.

    or else if u r looking to forecast Nw capacity/BH Traffic by available BH Traffic data, several methods can be used.

    Pls tell me, what do u want to calculate?

    Atleast if u can find NW Congestion, ur calculation will be more accurate..

    Regards,
    Chathura

    #34537 Reply
    Pix
    Guest

    Chathura,

    Easy… ? Dimensionning a network simply by knowing the amount of traffic it will carry ? It can work on a small area ( city, a rural region) but it can’t work on mixed environment. In the latter case, you can’t now how many BTS and TRX you’ll need to provide enough coverage.

    Let’s not forget that a network is primarily design to cover a certain surface of land (in sq. km). The national government will force the operator to cover a certain percentage of land.

    Let’ take a stupid example : With one site, with 12 sectors and 12 TRX per sector, you can provide capacity for a whole province, but you will not be able to provide coverage.

    #34538 Reply
    Chathura
    Guest

    Pix, Robin,

    I agree with you PIX, but I guess robin just need to know the NW capacity from carried BH traffic. I’ve mentioned only abt capacity dimensioning & not anything abt coverage planning

    rgds

    #34539 Reply
    Vaughan
    Guest

    Hi,

    I am working with the following configuration: –

    2 TRX – (16 TS)
    1 BCCH – (1 TS)
    SDCCH – (2 TS)
    2 Reserved GPRS (2 TS)
    Remaining GSM= 11 TS

    How do I work out how many TSs are being used for GSM assuming the Half rate percentage?

    Average GSM Blocking in BH = 0.000949785%
    Offered Average GSM traffic =
    12.17574554 Erlangs (including Blocking)
    Half rate = 95%

    Kind regards,

    Vaughan

    #34540 Reply
    Pix
    Guest

    Chathura,

    I fully agree with you, it is possible to compute a capacity out of a predicted offered traffic… It works at a cell level for instance.

    I’m just pointing out that any serious dimensionning engineer will never based a study on the traffic offered only (talking about radio capacity). It is possible, but it is useless.

    If you’re dimensionning a BSC, or A interface, or a MS, etc.. ok, a capacity-based study will work.

    I’m sorry if i’m being stubborn, but the guy is gonna build a tool that is absurd… it’s a pity ! he’d rather spend his time doing something that’ll help us roll-out a network 😉

    #34541 Reply
    maria
    Guest

    hi everybody,
    i m new in GSM, i have mini-project about conception of traffic for GSM network.

    i ‘ll be glad if someone help me how to prvide documentation about.

    regards

    #34542 Reply
    Pix
    Guest

    hello maria,

    you can easily simulate a GSM network by using the same hypothesis as the ones used for Erlang B Law (check on wikipedia)

    basically, it’s random usage of resources, etc..

    #34543 Reply
    Soumendra Panda
    Guest

    How can i improve the Quality of GSm Networks.Pls give me the basics and guidelines related to this topic.

    #34544 Reply
    Pix
    Guest

    Hello Pandra,

    Basics for optimization:

    – clean frequency planning (no interference)
    – all neighbours are correclty defined
    – avoid same bcch/bsic among cells of the same LAC (or at least the same geographical area)
    – check orientation and tilt of antennas, so that coverage is good, but not too much overlap in cities.

    Once you’ve done that, your netwtork is optimized at 95%

    Final step : check all your radio parameters are set to their default values (cf your vendor documentation)

    #34545 Reply
    sanmi isinkaye
    Guest

    please if any one can just help me with how congestion is being controled on the GSM network, and the various congestion that we have. you can mail isinkayes@yahoo.com

    #34546 Reply
    Soumendra Panda
    Guest

    What is MAIO and how it is related to the network?

    #34547 Reply
    Soumendra Panda
    Guest

    Half rete or full rate ,

    wghich one is better and how

    #34548 Reply
    Pix
    Guest

    Hi Soumendra,

    The half-rate is better, but the full-rate is also better. But in a way, we’re all better.

    MAIO is related to the network in the sense that it is a radio parameter.

    If you have more of those questions, please keep them coming, they are very better.

    #34549 Reply
    Jaspreet Singh
    Guest

    Can anyone throw some light about GSM Basics like BCCH/Bsic/Frequency Planning.

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