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Data session throughput

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  • #67010 Reply
    mXa
    Guest

    I am trying 2 methodologies for data sessions
    1- Single file download
    2- Multiple files download at same time

    Throughput is higher for case 2 than that of 1 with a big percentage. Does anyone know the reason for this variance?

    Thanks,
    mXa

    #67011 Reply
    SHELDON
    Guest

    I think the difference is as a result of downloading a smaller file in case 1. In case 2, the combined effect of downloading multiple files is equivalent to downloading a big file.

    In order to correctly measure throughput, you need to download a big file (eg 20Mb). Otherwise, the throughput will be fictitiously low. This is because the throughput starts increasing from zero(just before u start downloading), and if the file is small, it will finish downloading before you achieve the maximum throughput.

    Hope this helps

    Sheldon

    #67012 Reply
    mXa
    Guest

    Thanks Sheldon for ur reply. What u r saying makes sense, I will try it.

    There is another thing in my mind. What are the things that delay me from reaching my maximum throughput ? (if i assumed downloading a large file)

    mXa

    #67013 Reply
    pix
    Guest

    hi mxa,

    are you in EGPRS or in 3G ? HSDPA ?

    the reason for slow transfer at the beginning is that the system is being cautious : it assumes you have bad radio quality so it encodes the signal with high % of protection + it modulates the signal with a robust modulation.

    pix

    #67014 Reply
    mXa
    Guest

    hi pix,
    I am on 3G. I checked TCP window value and it is in an adequate range.

    What u r saying implies for both 2G and 3G ? Can I change that % of protection to make a faster start ?

    mXa

    #67015 Reply
    mXa
    Guest

    Pix,

    I meant HSDPA in 3G.

    Thx

    #67016 Reply
    mXa
    Guest

    Pix,
    what is the deal with protection bits ?

    mXa

Viewing 7 posts - 1 through 7 (of 7 total)
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