- This topic has 61 replies, 1 voice, and was last updated 2 years, 4 months ago by sandeep harkude.
1st September 2010 at 10:27 #47377MANOJGuest
What we have to do improve TBF drop, when suggested has applied.
For Nokia 1800 can improve 2 to 3 % TBF drop if KPI is 90%11th October 2010 at 12:57 #47378ANAND AGARWAL (INDIA)Guest
What is a TBF drop.
DOES TBF DROP MEANS TEMPORARY drop in Packet data connection and same is resumed again. However subscriber will not face drop in connection.
If yes than is it drop at Air Interface/abis/Gb.
Is it related to TCH drop.
If not than what are the reasons for a TBF Drop in NSN BSS.11th October 2010 at 18:36 #47379pixGuest
TBF drop means the user looses throughput for a while (few seconds), but that’s usually enough to stop the ftp transfer or prevent the webpage from being displayed fully. So yes, in the end, a tbf drop is impacting the subscriber experience.
It is mostly due to radio problems (interference, coverage, mobility…), but other reasons can happen : PCU software failure, TCH traffic preempting the TBF’s radio timeslots, or abis/ater failures. The failure of the Gb interface does not impact the TBF drop (but the Gb should never fail, anyway).
If it is a DL drop, the PCU will establish a new TBF for that MS in order to retransmit the data. But as I said above, it is probably too late for the MS : the webpage or the download is already stopped.
If it is a UL drop, the MS is not obligated to establish the UL TBF again. It is up to the subscriber it establish it again.
pix1st April 2011 at 12:41 #47380billGuest
what should be the target value of tbf drop rate? and how can we improve it?20th May 2011 at 14:22 #47381sudharGuest
what is the best value for N3101,N310518th June 2011 at 11:17 #47382AbhijitGuest
Can any one tell me what is PCU Reject?
What is the process to stop this rejection?
Please Help me…20th June 2011 at 05:23 #47383billGuest
i need to improve my nw tbf drop rate, vendor is siemens, current value is b/w 6–8, i need to improve it to 03–04, what should i do? :S25th August 2011 at 15:14 #47384surendra yadavGuest
i want to know that what is the impact of tbf rejection on DL_mas11th September 2012 at 13:14 #47385TAPAL ROY BASUNIAGuest
HOW WE IMPROVE TBF SUCCESS RATE IN 2G ,DATA KPI…NOKIA SYSTEM13th September 2012 at 10:27 #47386GuruGuest
Setting the higher value for dynamic setting also result high TBF drop14th September 2012 at 12:57 #47387manishGuest
please provide four reason to improve TBF SUCESS RATE,
I AM USIN NOKIA EYESPOT SERVER FOR KPI.6th December 2012 at 14:32 #47388ouchfaGuest
what is the stagnat drop, reallocation drop?
please, can you explaine how to reduce the tbf fail and tbf drop, for each cause of drop or fail,, thanks20th January 2013 at 04:53 #47389parthGuest
System is NSN.Having high TBF Drops in all the BSCs(around 4%-5%).Extended UL TBF is enabled and is mandatory.Please suggest parametric changes to bring it down to < 1%.Activities already done were as follows:: 1.Increased CDED 2.Increased CDEF 3.Changed settings of alpha & gamma 4.Increased RRH values Main observation is that TBF Drop due to Flush and MS no response is high.Please suggest urgently. Rgds16th March 2013 at 05:51 #47390parthGuest
Hi Can any one please respond to my query?16th March 2013 at 18:05 #47391pixGuest
for the FLUSH ->
– identify the TIMER_FLUSH in NSN, and increase its value.
– activate NC2 in order to reduce the number of cell reselections
– push data transfers to the 3G layer 🙂
for the MS NO RESPONSE ->
This encompasses several possible causes. Are they mostly occuring during UL or in DL TBF ?
But let’s focus on MS NO RESPONSE due to “POOR RADIO” conditions. In such cases, you want to make the data transfer less sensitive to poor radio conditions. A good way to do that is to:
1/ reduce MCS usage (from MCS9 to MCS6 for example)
2/ activate IRQ in DL and UL
3/ reduce inactivity timers (less time in TBF = less chances to drop !)