- This topic has 7 replies, 1 voice, and was last updated 11 years, 4 months ago by pix.
2nd December 2009 at 15:59 #59949slim OTTGuest
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?2nd December 2009 at 16:11 #59950pixGuest
there is another thread about this, but in AMR only.
do you suffer from DTX in non AMR calls too ?
pix3rd December 2009 at 03:47 #599512112Guest
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.3rd December 2009 at 07:58 #59952slim OTTGuest
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??3rd December 2009 at 08:56 #59953PixGuest
The DTX measurements are usually precise enough, they should not degrade your HO QUALITY so badly.
Are you using AMR ?
Pix3rd December 2009 at 09:03 #59954slim OTTGuest
yes Pix ,
the rate of AMR is high (upper than 80 %)3rd December 2009 at 10:49 #59955AsoGuest
If the network DTZ is active does the averaging take into consideration the DTX as to weight the averging.
aso3rd December 2009 at 12:57 #59956pixGuest
check the other thread, answer is there 🙂