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Uplink TBF & Downlink TBF

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  • #65044 Reply
    George
    Guest

    Number of Uplink TBF Establishment Attempts: 1799
    Number of Downlink TBF Establsihment Attempts: 1507

    I think Uplink attempts should be more and Downlink Attempts should be very less. When I want to attempt to any Web Site I use UL TBF. When I need DL TBF?

    Could you give more information in which service request we use DL and UL?

    Thanks a lot

    #65045 Reply
    pix
    Guest

    to access a website, you need UL TBF to send the request
    but to download the webpage, you need a DL TBF ! 🙂

    #65046 Reply
    George
    Guest

    Thanks a lot Pix, I’m new in GPRS system. Could you give more information for the following questions:

    1. Is there any value for TBF?
    2. Why do we use TFI if we already have TBF?
    3. Is TFI cell parameter and changeable?
    4. If I want to know the downloaded/uploaded traffic in a cell. To which counter should I look at?
    5. If I want to know the average DL/UL speed. To which KPI should I look at: RLC throughput or LLC throughput?

    Thanks a lot in advance.

    #65047 Reply
    pix
    Guest

    1. Is there any value for TBF?
    _ no, a tbf is the list of timeslot “pdch” that the MS can use in one direction.

    2. Why do we use TFI if we already have TBF?
    _ to identify the TBF that this MS uses compared to other MS in the same TRX. It is just a logical identifier.

    3. Is TFI cell parameter and changeable?
    _ no, it is dynamically allocated by the MFS. It doesn’t mean anything to us, mere mortals.

    4. If I want to know the downloaded/uploaded traffic in a cell. To which counter should I look at?
    _ indicators are vendor dependant. in ALU, you can check the RLC throughput per cell.

    5. If I want to know the average DL/UL speed. To which KPI should I look at: RLC throughput or LLC throughput?
    _ LLC throughput per TBF = throughput from user point of view. If you don’t have it, then you can use the useful RLC throughput per TBF. It is almost as precise.
    You can also check the usage of MCS per TBF, that gives a good indication too.

    Regards
    pix

    #65048 Reply
    George
    Guest

    Thanks again, Pix.

    2. Why do we use TFI if we already have TBF?
    _ to identify the TBF that this MS uses compared to other MS in the same TRX. It is just a logical identifier.

    So I understood like that: TBF is just logical connection between MS & BSS during data transfer and TFI is a identifier of each logical connection (TBF). If it is correct, please give you opinion.

    Does one TFI belong to one MS during data transfer in the same cell/TRX? Or in the same time multiple MSs can use same TFIs?

    Thanks in advance

    #65049 Reply
    pix
    Guest

    george,

    each MS in a transfer is using one unique TFI in the TRX, in one direction.

    For example, on TRX1:
    TFI=1 is the UL TBF of MS2 and corresponds to the TS n°2 and n°3
    TFI=2 is the UL TBF of MS3 and corresponds to the TS n°2
    TFI=3 is the UL TBF of MS4 and corresponds to the TS n°2 & n°3
    etc…

    in DL
    TFI=1 is the DL TBF of MS5 and corresponds to the TS n°1, 2 & 3
    TFI=2 is the UL TBF of MS2 and corresponds to the TS n°2, 3, 4
    TFI=3 is the UL TBF of MS6 and corresponds to the TS n°1, 2, 3
    etc…

    When the TBF is released (no more data to transmit -for ul tbf- or receive -for DL tbf-), the TFI can be reallocated to another MS.

    Cheers
    pix

    #65050 Reply
    SRK
    Guest

    Hi Pix i have been reading your answers in this post for last so many months and could say in a nutshell that you are the best in business .Plz continue your dissemination of knowledge which helps each one of us in our work front.Thanks .

    #65051 Reply
    Pix
    Guest

    SRK,

    And guess what, no I’m also learning LTE ! Soon I’ll be disseminating infectious LTE tips 🙂

    Thanks for the compliment by the way, i appreciate it 🙂

    Cheers
    pix

    #65052 Reply
    az
    Guest

    Hi Pix.
    thanks For your good Infotmation About Mobile Network. Im new in Huawei GSM Optimization. Please Send Me More document about that if you can.
    Tx.

    #65053 Reply
    da
    Guest

    please tell me what is this number in huawei : NCS412C

    #65054 Reply
    Akn
    Guest

    Hi all,
    Can anyone explain this HUAWEI counter ?

    “A334:Number of Failures to Decode the Code Streams on the RACH(none)”

Viewing 11 posts - 1 through 11 (of 11 total)
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