- This topic has 22 replies, 1 voice, and was last updated 9 years, 11 months ago by Dell.
12th May 2010 at 15:23 #62629JACKGuest
i read in one POST that:
“DL power control and DL DTX are a way to decrease downlink interference in a network. Combining them is the most effective, but just using one of them is possible.”
why we can only use one of them?13th May 2010 at 04:45 #62630ManiaGuest
Yup you can use both combined and independently.
but why would you want to use them indipendently as both only have advantages and no disadvantage that I can think of.13th May 2010 at 05:19 #62631jackGuest
what is advantages & advantages of each other and both of them?20th May 2010 at 05:43 #62632ManiaGuest
Both decrease interference DTX by not transmitting during silences in speach and Power control by transmitting only that level that is necessary to maintain desired quality.
Again both effect to reduce interference. and both should be logically be enabled, you can have a trial of enabling one after the other and your KPIs would improve.21st May 2010 at 15:49 #62633JACKGuest
it is very very helpful1st March 2011 at 19:39 #62634DellGuest
we’ve made indoor measurement in basement of one building and in Idle mode the power was about -85 dBm to -90 dBm but stable. After starting call in Dedicated mode RxLev_Sub (also RxLev_Full) decreases and varies between -95 dBm to -100 dBm. DTX is enabled. Frequency hopping is used (SFH). Why is this hapening? What’s the cause of this. Should we disable Power Control, if yes, how? If no, what should we do?
Hope someone will help me.
Dell2nd March 2011 at 13:19 #62635DellGuest
Anybody?2nd March 2011 at 16:29 #62636SHELDONGuest
I think there are two possible causes of your problem
1. The transmit power on non-BCCH TRXs is lower than that on the BCCH TRX
2. Too aggressive power control settings.
Case 1 can be corrected by changing the relevant parameters, and case 2 can be corrected by either disabling power control or changing the desired signal level values.
How these changes can be done are very much dependent on your vendor.
Best Regards2nd March 2011 at 19:32 #62637DellGuest
Thank you very much for your response. The vendor is ALU, version B10.
Dell2nd March 2011 at 20:44 #62638PixGuest
the DL Power Control is activated ?
what is the setting of PWRC ?
pix3rd March 2011 at 05:13 #62639ManiaGuest
I am not sure if there is any issue. Either you have harsh Power control settings or or faulty Radio… for testing a faulty TRX you can disable Power control and check calls on both TRXs should be getting same levels.
If the issue is of Harsh Power control settings and your Quality / Voice quality is not being degraded then you need not worry and and if your quality is being degraded then you should see what your quality window is as even in degraded quality its not increaseing power…3rd March 2011 at 10:20 #62640DellGuest
MS_PC and BS_PC is enabled (if you meant by that power control). PWRC is disabled, should we enable it?
Dell3rd March 2011 at 13:53 #62641pixGuest
yes, that’s the PC parametrs, thanks.
pwrc cannot be disabled… the good value should be:
“1: measurements made on BCCH frequency are not included”
kindly test mania’s recommendations (welcome back mania 🙂 )
– disable BS_PC
– to simplify the analysis, stop base band hopping and use “no hopping” instead.
– do the drive test
– 1/ connect on tch on the BCCH TRX
– 2/ connect on a tch on a non BCCH TRX
problem still here ?
another to investigate … chec the qos indicators “path balance” and “rtch erlang total” per TRX. are some trx’s having a path balance far away from 0, while carrying erlang > 2 erlangs ?
pix3rd March 2011 at 14:11 #62642DellGuest
Hi Pix & Mania,
thanks. Again, we are using Synthesized FH not BBH nor NoHopping. As I know PWRC should be NOT_INCLUDED for SFH (for BBH yes). Should I include PWRC and BS_PC disable or just first to try with BS_PC? The problem is indoor not outside. The quality and level outside is fine. No path balance issue, no problem with TRXs.
Dell3rd March 2011 at 17:58 #62643pixGuest
pwrc must always be set to “not included”, whatever your hopping (sfh, bbh, nh).
the problem doesn’t happen outdoor ? then you don’t have a problem…
just to be sure : when you get rxlev_idle = -85dBm, there is no drop of rxlev when you make a call ?