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RLT & ARLT

  • This topic has 9 replies, 1 voice, and was last updated 6 years ago by Nitin Giri.
Viewing 10 posts - 1 through 10 (of 10 total)
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  • #60694 Reply
    M
    Guest

    Hi All,

    Can anybody tell me y we generally give ARLT higher value than that of RLT ?

    Lets Say:
    RLT :20 SACCH Frames.
    ARLT :28 SACCH Frames.

    //

    #60695 Reply
    Bijoy
    Guest

    because AMR codecs are more prone to signalling Drops.

    Br\\
    Bijoy

    #60696 Reply
    M
    Guest

    Thnx Bijoy,

    Can u explain a bit more about this.

    //

    #60697 Reply
    Bijoy
    Guest

    Let me try.
    With AMR we are increasing speech robustness,but not of the SACCH.So,though the subscriber may not experience degraded speech quality,call drop may take place due to RLT timeout,so we increase the RLT value for AMR.

    #60698 Reply
    Pix
    Guest

    The AMR RLT is just a workaround, very ugly one…

    The proper solution proposed by 3GPP is actually to implement Repeated SACCH, to increase SACCH Robustness, in case of AMR call.

    Pix

    #60699 Reply
    Bijoy
    Guest

    Thats correct.
    Repeated SACCH & FACCH feature though came quite late as a remedy

    Br\\
    Bijoy

    #60700 Reply
    Pix
    Guest

    Yes, something like 5 years after AMR implementation :))

    you would think that GSM 3gpp people are mainly working on improving speech quality. Because that is what GSM does best : voice…

    But no, they spend time improving the packet domain (DTM, EDA, NC2 Reselections, superb codecs and retransmissions, etc)….

    Strange…

    #60701 Reply
    JOE
    Guest

    Hi,
    I have question about repeated Facch, Sacch in ALU:
    Why after activation of repeated SACCH/FACCH the call drop increase mainly with reason DL Quality??? Pls help!

    #60702 Reply
    pix
    Guest

    hi joe,

    what do you mean “call drop with bad quality” ? which indicator do you refer too ?

    the “RTCH Drop rate due to radio” increased, is that it?

    Please detail your issue, I’ll do my best to help.

    Regards,

    pix

    #60703 Reply
    Nitin Giri
    Guest

    what is use arlt & ahrlt and what is impact after value increament

Viewing 10 posts - 1 through 10 (of 10 total)
Reply To: RLT & ARLT
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