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DL DTX

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  • #59949 Reply
    slim OTT
    Guest

    hello Pix,
    we have implemented DL DTX in 2 BSC in our network.But the global result was an increase in DL Quality HO.Some BTS were the most impacted , the others less.
    The parameters related to DL DTX are at BSC level not cell level
    What’s the cause of that degradation?Is there some tunning to overcome that??recommendations?

    #59950 Reply
    pix
    Guest

    hi slim,

    there is another thread about this, but in AMR only.

    http://www.erlang.com/forum/erlang/thread.htx?thread=5535

    do you suffer from DTX in non AMR calls too ?

    regards,
    pix

    #59951 Reply
    2112
    Guest

    Please check 3GPP Series 05.08 section 8.3 i.e Radio Link Measuremens and Aspects of DTX, apparently this increase in DL Quality is because of relatively inaccurate RXQUAL Measurements by Moble Station as lesser number of frames are being transmittted in DL because of DTX.

    #59952 Reply
    slim OTT
    Guest

    Thanks Pix and 2112 for clarifications, But i have a question.
    If it’s a story of inaccurate measurements reported by MS , there’s a non DTX parameter (to affect a weight) for Quality HO in non DTX mode : from 1 to 3.
    So if the decision of a DL quality HO is token for example with 6 consecutive measurements reported to the BTS and let’s say that 3 of them are DTX (weight =1) and for the 3 others real measurements the weight is 2 (we have affected the value 2) then the decision will be token especially on non DTX SACCH’s since the weight is 2.the decision is so more logic.
    But even with this parameter no decrease in DL quality HO.
    Any reply??

    #59953 Reply
    Pix
    Guest

    Slim,

    The DTX measurements are usually precise enough, they should not degrade your HO QUALITY so badly.

    Are you using AMR ?

    Pix

    #59954 Reply
    slim OTT
    Guest

    yes Pix ,
    the rate of AMR is high (upper than 80 %)

    #59955 Reply
    Aso
    Guest

    If the network DTZ is active does the averaging take into consideration the DTX as to weight the averging.
    BR
    aso

    #59956 Reply
    pix
    Guest

    slimott,

    check the other thread, answer is there 🙂

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