improve TBF drop rate

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%

hi anand,

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.

Regards
pix

what is the best value for N3101,N3105

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? :S

HOW WE IMPROVE TBF SUCCESS RATE IN 2G ,DATA KPI…NOKIA SYSTEM

please provide four reason to improve TBF SUCESS RATE,

I AM USIN NOKIA EYESPOT SERVER FOR KPI.

Hi,
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. Rgds

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 !)

Regards,
pix