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Half Rate effect to the QoS.

Viewing 7 posts - 1 through 7 (of 7 total)
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  • 5th September 2008 at 05:12 #53794
    SM
    Guest

    Dear all,

    I would like to know that the Half Rate will effect to the QoS(such as increase the call drop) or not?

    Thank you very much for your time.

    BRs,

    5th September 2008 at 06:50 #53795
    pix
    Guest

    hi sm,
    normally, it shouldn’t have any effect on call drop rate…

    BR
    pix

    5th September 2008 at 08:17 #53796
    SM
    Guest

    Dear Pix,

    That’s mean it doesn’t have any effect to any QoS? (except the vioce quality should be more poor than the FR,right?)

    This result is from the theory or in the actual network which is using the HR?

    We are using Alcatel and Motorola BSS.

    BRs,

    5th September 2008 at 16:26 #53797
    pix
    Guest

    it’s from theory… in reality

    1. your BSS is carrying more subscribers –> more load, more signalling –> more risk of failures

    2. the HR codec is a little less protected than the enhanced full rate, so it’s *slightly* more sensitive to interferences. But it’s noticeable only if the frequency planning is bad in many areas.

    to fight problem 1 –> contact your vendor so they can fix their machines
    to fight problem 2 –> activate AMR HR, which provides more resistant codecs than the legacy HR.

    7th September 2008 at 14:17 #53798
    rf fan
    Guest

    I think that signaling channels don’t depend of used codec, so it has not any effect over call drop.

    7th September 2008 at 17:03 #53799
    pix
    Guest

    hi rf fan,

    the fact is:

    if you put twice more calls on a cell, it means the BSC has to double its “signalling” processing. Meaning it has to monitor twice more calls than before.

    so yes, half rate is putting more load on the system, from a signalling point of view (i’m not talking about Air/Abis signalling ! i’m talking about BSC processing load & also BTS load). But perhaps the BTS/BSC can support this load without any problem. Or perhaps it can’t. I’ve heard stories about some systems that couldn’t (in the past… –> i don’t know what is the situation right now)

    regards,
    pix

    15th September 2008 at 10:35 #53800
    eng
    Guest

    I have noticed that in HR mode, SQI is more affected, the fact that the maximum SQI in HR mode is only 17. And fast SQI degradation is observed especially in areas where RxLevel is not good. Yes, if there is interference, subscriber experience is not that good, which would relate to bad RxQuality.

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