- This topic has 14 replies, 1 voice, and was last updated 8 years, 9 months ago by Sergio.
28th April 2009 at 15:52 #56902JackyGuest
Since an inter BSC site mutation, we observed that the UL and DL TBF Drop rate increased in the BSC source with MSC9 usage increase and GCH Load decrease. I assume that this behaviour is normal since MCS9 usage induces more TBF retransmission and therefore more TBF Drop. any comment about this behaviour plz?
Thanks28th April 2009 at 19:16 #56903RexGuest
I think until the TBF_Establishment_Failure (UL/DL)is low, there is no wory about that.
Regards,29th April 2009 at 08:00 #56904JackyGuest
Thanks Rex, can i have a threshold for TBF_Establishment_Failure(UL/DL), otherwise how explain the TBF drop increase?4th May 2009 at 14:41 #56905RexGuest
the threshold for tbf_est_failure in our net is 5%. About TBF drop increase, I’m not sure. Maybe redeclaring NSVCs on SGSN side will improve (decrease) tbf drop, once we tried and there were improvements.
Regards,5th May 2009 at 10:07 #56906JackyGuest
Thanks Rex for the tbf_est_failure we have the same values as yours.15th June 2009 at 08:52 #56907Anis ZayaniGuest
with drive test tool as TEMS Investigation where can I locate the TBF DROP rate and the TBF Establishement succes rate
thanks16th September 2009 at 05:03 #56908MacGuest
Can u pl tel what exactly do u mean by redeclaring NSVCs on SGSN side?
And I too am interested to know answer to Anis’s querry.
Thnx in advance!!16th September 2009 at 05:20 #56909MacGuest
INIT MCS parameters are recommended fir TBF drop improvement. Just to share with you, I changed the INIT MCS (DL/UL) from 6/5 to 2/1 & I got good improvement in the Attach Success rate!!! But there was no impact on TBF drop. Perhaps u may try & share the results.
Thanks.12th October 2009 at 13:34 #56910HamzaGuest
any chance of improving UL TBF Est. Success Rate?
what parameters to hit?!
all this data for 2.5G is meaningless13th October 2009 at 19:37 #56911PixGuest
Wrong thread… try this one :
pix23rd March 2010 at 07:45 #56912VIKASGuest
WAT IS THE RLTIMEOUT IN GPRS?23rd March 2010 at 10:02 #56913pixGuest
the equivalent for “TBF drop” is called N3101 and N3103.
pix1st April 2010 at 13:50 #56914van_guenGuest
could you please, give me more information about drops due to N3101,N3103 and Npolling, because I have problems with high level of TBF Drops in UL. The N3101,N3103 and Npolling drop causes are so high…
Is it possible to adjust some parameter related to N3101 and N3103?
The problems with TBF_Drop_UL comes after Extended_TBF_UL activation.
Thank you in advance and wish you Happy Easter holiday :))
Rado_bg23rd June 2010 at 13:34 #56915DebashisGuest
What is explain more on RLTIMEOUT and INIT MCS (DL/UL) from 6/5 to 2/1.
Debashis26th June 2012 at 19:37 #56916SergioGuest
In the formula we have the accessibility seguintres plots: SDCCH Blocking, Fall and Fail SDCCH channel traffic. I wonder what the relationship between them for this indicator.