- This topic has 29 replies, 1 voice, and was last updated 10 years, 1 month ago by bill.
30th November 2007 at 10:15 #49762pixGuest
no ! the GAMMA & ALPHA don’t work this way at all (or maybe you didn’t explain it clearly enough for me).
please refer to the formula i posted a few posts before.1st October 2009 at 11:46 #49763lilyGuest
I just want to say THANK YOU VERY MUCH!
I faced the problem described below (low TBF_est_successful_rate_UL for all cells in BSC, when in DL everything was OK). During 4 days for 6 BSCs enormous GPRS KPI degradation was detected (all BSCs had same symptoms). We performed all usual manipulations, but – in vain (also reset GPUs, even changing them).
We were ready to initiate FaultReport to our TAC, but then I’ve decided to find something in erlang.com…
… After deactivating PC for GPRS (set ALPHA to 0 and GAMMA to 0) our problem was solved!!!!
:))2nd October 2009 at 13:00 #49764PixGuest
I hope that your team will build a statue in my honour, right in the middle of your office :))4th October 2009 at 15:59 #49765BijoyGuest
what i got from this whole discussion that you guys have set the alpha & gamma incorrectly.i dont know,but have u checked for any bsc level gps pc parametrs.
i’ve worked in ericson,nokia,huawe,zte & motorola systems(except alu),but never found such a solution4th October 2009 at 20:23 #49766PixGuest
ALU system is rather temperamental, and some problems have a weird solution sometimes 🙂
you can set alpha and gamma correctly, it works for years. Then suddenly, a BSC shows UL TBF estab failures. Only way to decrease it (quickly) is to disable alpha and gamma.
there’s magic in the air…5th October 2009 at 11:15 #49767lilyGuest
Bijoi, as Pix said it’s “unusual” solution, but it really works! Today I’ve changed back ALPHA and GAMMA but problem hasn’t appeared again 🙂 such a little trick!
… yes, Pix, on a pedestal just in the middle of our main office. And every morning all engineers from operational department will pray at it with words: “bless us to work with ALU HW, give us defense from Misalignments and VSWR etc….”
Before difficult and especially danger works (like moving BSC from MSC to MSC or something like this 🙂 we’ll make sacrifice (oh, what kind would you prefer?) to propitiate formidable prophet 🙂
What do you think? :)))
I wouldn’t be surprised that after such actions our network will work better 🙂 As you said, ALU equipment is “rather temperamental” 🙂5th October 2009 at 16:59 #49768PixGuest
A good sacrifice… mmm… burn a Huawei BTS every morning 🙂14th October 2009 at 03:36 #49769ahmadGuest
hi all ,
am a NOC enginner , could you plz explain more about alpha & gamma, where i can find them , and what a recomended value for them?
our vendor is huawei & ZTE.
ahmad15th October 2009 at 06:47 #49770lilyGuest
Good morning Pix
… two huawei BTS and two huawei sales managers every morning 🙁
…yesterday they persented “grandiose” project for our company – swap BSS from Alcatel/Siemens to huawei … hr-r-r …
Fortunately they got a unambiguous refusal yesterday, but their persistent was very irritating
so – 2 BTS + 2 managers :))))15th October 2009 at 20:41 #49771PixGuest
That’s good news 😉 By the way, a GSM trainer will come give a training to your company next year. But that won’t be me…
I understood that 3G is on the way in your company ?16th October 2009 at 15:37 #49772lilyGuest
Good evening, Pix!
Oh, we’re looking forward to this training :)))) Very very pity that it won’t be you…
But things may change 🙂 I hope that it will happen and we we’ll have possibility to say “thanks a million” to you personally :))))
Yes, we’ve started deploying 3G-network (1xEVDO as CDMA-450) on Alcatel-Lucent equipment :)))
Have a nice evening!
…in Alcatel we trust…22nd October 2009 at 06:54 #49773RGGuest
I am facing the problem of high downlnk data and signal TBF failure.
Formula defined for TBF Failure is : TBF Abnormal Release / TBF Establish.
Pls recommend what i need to do.
Also pls tell me about the power control strategy (Open, Closed and Quality based)
Best Regards11th May 2010 at 06:47 #49774KGuest
I still have problem many cell.
(BSS B10 already set ALPHA to 0 and GAMMA to 0) but when disable BH to NH ,problem was fixed
Thank you11th May 2010 at 07:17 #49775PixGuest
Sometimes, just by resetting the cell, it will jumpstart the GPRS.
I can’t explain neither.24th February 2011 at 10:45 #49776billGuest
can you please explain what are the usual reasons for TBF drop rate in siemens equipment? what performance parameters to check for correction?