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different throughput in LLC and RLC

Viewing 15 posts - 1 through 15 (of 28 total)
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  • #59062 Reply
    Eric
    Guest

    Can any help me why there are some time RLCthroughput is higher than LLC throughput .

    #59063 Reply
    Pix
    Guest

    I-Hi,

    In the RLC throughput, are you taking into account the retransmissions or only the useful data ?

    Could you share what kind of values you see ?

    #59064 Reply
    eric
    Guest

    The values are for example throughput on RLC is 56kbit/s and LLC is 52kbit/s but some times for instance is viseversa LLC throughput is higher than RLC and indicator for throughput been checked it is really for me not clear to say it count retransmission but any way what is the real throughput in order to make EDGE dimensioning if it is possible give me a help

    #59065 Reply
    Pix
    Guest

    Hi Eric,

    For EDGE dimensionig, you should actually start from the Downlink RLC throughput required by users, on Air interface + the amount of EDGE users. That is your initial assumption. For example, as a EDGE user, I would want to get at least 130kb/s most of the time.
    And in average, you can assume there are 1.5 users at the same time in one cell. So you need : 6 or 7 PDCH with a throughput in MCS9, etc etc

    From this, you will deduce:
    1/ number of required TS & TRX
    2/ capacity required on Abis
    3/ capacity required in PCU (MFS in ALU)
    4/ capacity required in Ater PS & Gb interface

    #59066 Reply
    deep_k
    Guest

    hi pix/eric

    need a refresh

    could you guys help me with diffrence b/w RLC throughput and LLC throughput.

    #59067 Reply
    Pix
    Guest

    Hi,

    LLC is a big frame (max 1500 bytes)
    RLC is a small block that contains just one segment of a LLC frame.
    Each time one LLC frame goes through the PCU, it is segmented into smaller RLC blocks.

    Differences between both throughputs come from the RLC headers and RLC retransmissions (if they are included)

    pix

    #59068 Reply
    deep_k
    Guest

    hey pix

    am i reading the model correct:

    1.IP
    2.Transport
    3.N/w layer
    4.DLL
    a. LLC
    b. RLC
    c. MAC
    5.Physical

    is the order correct ?

    rgrds

    #59069 Reply
    pix
    Guest

    …the order is not correct.
    layer 1 is physical, etc

    where does your ip layer come from ?

    #59070 Reply
    name
    Guest

    can anybody like to share some sort of notes on EDGE/GPRS dimensioning wiht me

    #59071 Reply
    Edge user
    Guest

    What about SNDCP, what’s the difference between SNDCP and RLC/LLC?

    #59072 Reply
    Vikas Sehrawat
    Guest

    Subnetwork Dependent Convergence Protocol:-
    .Multiplexer/demultiplexer for different network layer entities onto LLC layer
    .Compression of protocol control information (e.g. TCP/IP header)
    .Compression of data content (if used)
    .Segmentation/de-segmentation of data to/from LLC layer

    Logical Link Control (LLC) Layer:-

    .Reliable logical connection between SGSN and MS
    .Independent of underlying radio interface protocols

    #59073 Reply
    Shakeel Khan
    Guest

    what is RLC? abbrevation of RLC, Definition and full detail of RLC??? Plz any one help me.

    #59074 Reply
    Monjur
    Guest

    Difference between LLC/RLC/TBF/PDCH throughput????

    #59075 Reply
    pix
    Guest

    you should re-read the whole topic, all the answers are there.

    #59076 Reply
    Bryan
    Guest

    Based on the trend of the discussion, does it mean that the RLC Throughput reflects more of the user experience compared to LLC Throughput?

Viewing 15 posts - 1 through 15 (of 28 total)
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