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  • #58186 Reply
    msa
    Guest

    helow pix
    can u expalin to me the difference between TBF and PDCH and how i know the utilizain of FRL link if we used GB over framelay
    thank beforehand

    #58187 Reply
    Pix
    Guest

    TBF = group of PDCHs allocated to one user for one transfer in one direction. In normal situation, a user needs to transfer data in downlink and uplink at the same time (useful data in dl, “clicks” and ack in uplink) –> one user usually gets 1 UL TBF and 1 DL TBF.
    The TBF is released a bit after the transfer is finished. One transfer, for example, is one webpage, or one MMS, or one file.

    PDCH = one physical timeslot, configured for packet transfer

    1 TBF = 1 user = n consecutive PDCHs
    but …
    1 PDCH can be shared by several TBF at the same time.

    so ..
    1 TBF = n consecutive PDCHs, but those PDCHs may or may not be only allocated to this TBF only.

    Utilization of FRL = volume of LLC frames transmitted or received.

    #58188 Reply
    DS
    Guest

    Utilisation of FRL=
    (LLC frames(bytes)transmitted/received)*100 / bandwidth of FRL

    #58189 Reply
    msa
    Guest

    excuse me and what LLC mean , and what FRL bandwidth u mean is u mean number of TS configure to FRL link.

    #58190 Reply
    DS
    Guest

    bandwidth= timeslots of FRL * 64

    #58191 Reply
    msa
    Guest

    thanx DS , and what is the LLC

    #58192 Reply
    Pix
    Guest

    LLC in “Google” : Logical Link Control

    –> 3GPP defines the LLC precisely.

    enjoy !

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