- This topic has 19 replies, 1 voice, and was last updated 8 years, 10 months ago by Boniphace Meshacky.
19th December 2007 at 17:33 #50093flavioGuest
does anybody knows if this formulae is correct? It concerns Ericsson equipment/counters.
[RA Failure] = RAACCFA/(CNROCNT+RAACCFA)
If so, what are the reasons that can lead a n/w to present bad performance, about 18-20% of failure rate?
It is present of Ericsson and Siemens nets.19th December 2007 at 17:46 #50094flavioGuest
additionally, does it imply on any kind of bad end-user perception? which ones?19th December 2007 at 20:44 #50095pixGuest
can you write down the counters definitions (trigger messages ?)7th January 2008 at 10:37 #50096flavioGuest
sorry but i don´t have anything but the formulae. i´ll try to find related document from the vendor.9th January 2008 at 06:17 #50097WaterGuest
The counters definitions are as follows:
RAACCFA:- this is incremented every time there is a failure in random access
CNROCNT:- this counter is incremented for all random access attemtps, failed or successful.
We have the same problem, there are some of our cells that register as low as 20% of random access success.9th January 2008 at 09:50 #50098ralaGuest
How to see the random access fail in Alcatel network?
Thank you in acvance. 🙂9th January 2008 at 13:21 #50099pixGuest
random access fail is counted as a SDCCH ASSIGNMENT UNSUCCESS (sdnaur)
in alcatel, the unsuccess varies between 5% and 20% in terrestrial-ABIS BTS, and it is about 50% for satellite ABIS BTS. Those are normal values.
pix10th January 2008 at 03:13 #50100ralaGuest
a SDCCH ASSIGNMENT UNSUCCESS(sdnaur)is the counter or indicator in Alcatel?
I cannot search from the Alcatel customer doc.
or is it the formular?
Regards,10th January 2008 at 10:03 #50101pixGuest
open RNO, go to QOS INDICATORS, in the family SDCCH ASSIGN, subfamily UNSUCCESS CAUSES. You will find it here.
It is an indicator.
The SDNAUR is the correct name :
SDCCH_assign_unsuccess_rate ( SDNAUR )
( ( [MC04] + ( [MC148 – MC01 – MC02 – MC149] + [MC149])) / [MC04 + MC148])10th January 2008 at 10:34 #50102ralaGuest
Oh, I see..
It’s the SDCCH access failures, right?
Regards,10th January 2008 at 11:01 #50103pixGuest
hooo, that’s a rookie mistake :
failure = radio failures + BSS failures
unsuccess = congestion rejects + radio failures + BSS failures10th January 2008 at 13:19 #50104flavioGuest
5-20% are normal values for GSM, or it is vendor related? I checked Nokia performance and it is lower than 1%.10th January 2008 at 17:14 #50105pixGuest
it has nothing to do with the equipment performances. it has only to do with “how is computed this indicator ?”
Alcatel is taking into account ghost RACH, while I assume Nokia isn’t.
Using the same QOS counters, the values should be quite close.
Pix7th October 2009 at 05:20 #50106PrakashGuest
Can any one give the formula for Access failure rate (CDMA)formula for Lucent and ZTE.22nd June 2010 at 03:11 #50107vinodGuest
what is the reasons for RACH FAILURE in gsm