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Increase in Interferance HOs with DTX

Viewing 15 posts - 31 through 45 (of 77 total)
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  • 14th July 2010 at 13:30 #59888
    pix
    Guest

    ALU,

    good to know, and now we just need to find out at which B10 edition the problem was fixed… and perhaps, what was the problem initially…

    my email is pix_erlang (at) yahoo dot com

    try again, it should work.

    regards
    pix

    25th April 2011 at 01:06 #59889
    bjushka
    Guest

    Dear all,

    After seaching on high HO due to DL interference, I found this disscussion very interesting. We are having the same problem in our network.

    we have tried BCCH re-planning,even tunning from hopping to fix frequencies but with no results 🙁

    Maybe we have incompatibility of DTX and AMR as disscused,,, we have these features activated.

    If anyone has find a solution of high HO due to DL interference,,, please share it with us.

    thanks

    25th April 2011 at 03:02 #59890
    pix
    Guest

    hi,

    you should try a quick fix, for few hours. If you see an improvement, then it means that the problem comes from DTX/AMR.
    Otherwise, just put it back on.
    Here is what you can try : disable DTX for AMR calls.

    regards
    pix

    26th April 2011 at 16:10 #59891
    bjushka
    Guest

    Hi pix,

    we have disabled DTX but there were no effect in the network (only HO due to UL interference were increased a little bit, but this is normal, I suppose, without DTX).

    Maybe I will check AMR parameters!!! They are set default value but I dont know what could be the problem in this moment,,, any suggestion is welcomed 🙂

    thanks
    .bjushka.

    3rd May 2011 at 14:49 #59892
    bjushka
    Guest

    hi,

    good results are reported only after ARM deactivation,,, so HO due to DL interference are decreased only after AMR deactivation,,, how can this be possible???

    anyone can explain???

    BR

    3rd May 2011 at 23:22 #59893
    HI
    Guest

    We had the same problem with AMR in B10.

    Need to deactivate DTX_UL for AMR and then it should work. (DtxUplinkAMR=false, DtxUplinkAMR_HR=false)

    One question, if you are doing some hopping, Deactivate Intracell (all intracell, EN_INTRA_DL_AMR=EN_INTRA_UL_AMR=EN_INTRA_DL=EN_INTRA_UL=false), there is no sense using it in a hopping mode, it might trigger useless HO.

    BR
    Ian

    6th May 2011 at 21:25 #59894
    bjushka
    Guest

    hi,

    we did deactivate DTX but it didnt effect at all.

    yes, we are using frequency hopping.
    I have one question:
    about intra cell HO, you think isn’t compatible with AMR or with frequency hopping, can you please explain,,, I dont understand.

    Thanks

    bjushka

    6th May 2011 at 21:41 #59895
    Rex
    Guest

    Hi bjushka,
    IntraCell HO didn’t succeed with frequency hopping in our network. So we disabled it and after that it was Ok, HO failures and Incomming HO congestion were decreased. IntraCell HO is suitable with No Hopping. I think it’s better to disable IntraCell HO as HI said and keep them AMR, DTX and Frequency Hopping, you’ll see improvements.
    Regards,
    Rex

    6th May 2011 at 21:59 #59896
    bjushka
    Guest

    hi rex,

    we have deactivated today only intra cell HO for interference, and the result is HO due to DL interference decreased to 0% is noticed(this is good but to good to be true! )
    What bother me is that we can have internal interference in our network or just that intra cell HO for interference cause problems to AMR feature or to frequency hopping feature, normal functioning?

    Do you have any explanation?

    Improvement is good thing but as long as I dont know what have caused this problem I am not sure that deactivating HO intracell is a good thing to do,,, please help

    thanks for the help

    .bjushka.

    7th May 2011 at 01:41 #59897
    Ian
    Guest

    Hi bjushka,

    This is completely normal, when the mobile is hopping, there is no sense doing Intracell HO as TRXs are all hopping.

    So deactivating Intracell when Hopping is completely normal.

    Hope you solved your pbs.

    BR
    Ian

    7th May 2011 at 07:05 #59898
    bjushka
    Guest

    hi Ian,

    we have deactivated intracell Ho interference and the problem seems to be solved.
    Anyway, not all kind of intracell HO are needed to be deactivated, i think!
    In my case the quality is improved and the HO due to DL interference are decreased only after deactivating intracell HO interference UL/DL, but the cells are having intracell attempts for other causes different from interference.

    Am I right?

    Thanks for the help

    .bjushka.

    7th May 2011 at 07:18 #59899
    pix
    Guest

    hi,

    just for info :
    in alu, the parameter intracell_ho is used to activate only the interference handovers (cause 15/16). Other intracell ho, such as AMR, TFO, inter zone or cause 30, are not impacted by this parameter.

    cheers
    pix

    7th May 2011 at 08:49 #59900
    bjushka
    Guest

    Hi,

    Thanks Pix 🙂

    do you have any comment regarding the deactivation of intracell HO interference, in my case, do you think that intracell HO is not needed when SFH is used in a network?

    thanks

    .bjushka.

    7th May 2011 at 09:35 #59901
    pix
    Guest

    well, i personally don’t like it because in sfh, the interference HO could be useful ONCE. The system could TRY to move the MS to a better trx (the BCCH trx, ie). But if the MS still suffers interference, then the BSS should send the MS to another cell. So only one interference HO per MS… that would be god. But with ALU, the MS will be stuck in a loop, jumping from trx to trx, without any chance of changing cell.

    Therefore it is better to deactivate it when in BBH or SFH systems. Even in NH, it is questionnable to use it…

    Just my opinion,

    pix

    7th May 2011 at 16:50 #59902
    Ian
    Guest

    Hi bjushka,

    Did you activate the DL Pwr control, it might help you as well.

    We are now testing it on a cluster and it helped us to reduce interferences.

    By the way, are u using SFH 1*1 or 1*3 ?

    BR
    Ian

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