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AMR traffic

Viewing 14 posts - 1 through 14 (of 14 total)
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  • #55064 Reply
    AMR
    Guest

    Hi
    Can any body tell me how AMR increase traffic on cell with out increasing Congestion let say before AMR the traffic is 20 ERL but when AMR activated traffic increased without increase in Congestion.

    #55065 Reply
    pix
    Guest

    because you activated AMR Half Rate, I suppose ?
    The benefit you see is mostly linked to the “half rate” part of the AMR HR 🙂

    #55066 Reply
    AMR
    Guest

    Pix
    as for normal speech mode also there is halfrate but the thing that pay my attention is that let say cell A with both FR and HR took 32 ERl and whe i activate the AMR the traffic increased to 40 ERL with out increase in Congestion on TCH.
    regards

    #55067 Reply
    TZH
    Guest

    Check your dimensioning of traffic for the cell/site, existing cell/site using static TCHs or dynamic TCHs settings?
    AMR uses smooth transition between different bit rates and TCH HR-FR modes by determining the C/I condition, and also determining the congestion. The feature is also an anti-inteference tech, so you’d be allow to use more HR under bad air interface conditions. So it actually “increases” your capacity. (Only from Huawei equipment point of view, not sure other vendors using these paramters in AMR feature)

    #55068 Reply
    AMR
    Guest

    TZH
    also my operator is huawei

    #55069 Reply
    Pix
    Guest

    yes, it’s the same AMR, whichever vendor.
    In other words, TMZ, instead of a call drop, the call is kept with AMR under poor radio conditions, so there is more erlang in the cell. That makes perfect sense.

    The smooth transition you’re talking about is the fact that an AMR phone can start a call in FR and change to HR if asked by the network. Whereas a “dual rate” phone must keep the same codec from start to end of call (within the same cell).

    #55070 Reply
    MCI
    Guest

    HI
    I wanna know about activation of AMR in SIEMENS systems.
    Could anyone please send me this information in my email: kalankh@gmail.com

    #55071 Reply
    Evgen
    Guest

    TZH, you fully right – it depend from thresholod parameters for reselection from AMRFR to AMRHR (C/I, HOC,POC). But in our network main reason for increasing traffic after AMRHR activation – it MS which not support HR, but support AMRHR (such as Nokia 6630 and Nokia smartphones OS Symbian 9 with old SW version).

    #55072 Reply
    MCI
    Guest

    thank you for your attention but could you please tell me for steps of activation AMR in seimens systems or tell me the address of these procedure in Siemns documents?

    #55073 Reply
    AMR
    Guest

    Dear
    I would like to know if We activated AMR so there will be different traffic for each sppeech mode let say
    EFR is 40 erl
    HR is 30 erl
    AMRFR is 10 erl
    AMRHR is 20
    how to calculate the real traffic is the sum of all traffic or there is onter summation could you please help me

    #55074 Reply
    Pix
    Guest

    You can divide the HR and AMR HR traffic by 2, sum up everything and compare it to the Erlang B capacity of the cell

    40+15+10+10 = 75 erl / xxx capacity

    1 HR erlang = 0.5 FR erlang 🙂

    #55075 Reply
    AMR
    Guest

    PIX
    Thank you for your support but iam little bit confused if a cell takes 75 erlang with 6 TRXs after AMR active Congestion is not increase in the same time traffic increased as from erlang B 6 TRX with all TCH full rate and GOS 2% it will be around 33 Erl and If 50% HR active it be around 54 Erl . so what iwas supposing the Congestion must be increased.

    #55076 Reply
    AMR
    Guest

    is it possible to use in Cell let say four TRX two TRX support AMR and other Two TRX support EFFR/HR and how they make handover.

    #55077 Reply
    pix
    Guest

    6 TRX = 42 timeslots FR or 84 timeslots HR
    42 channels –> 32.8 erlangs capacity @ 2% congestion
    84 channels –> 72.5 erlangs capacity @ 2% congestion

    If you’re seeing 75 erlangs, it means that most of your traffic is probably in half rate (AMR or not), and that your congestion rate is around 2%.

    The erlang B is not exact in GSM, because of the TCH queue…

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