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improve TBF drop rate

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Pritam - 23rd January 2014  (17:46 GMT)

Hi please share your experience in
1.How to improve DL LLC discarded frames.
2.TIMER used to tune the TBF drop(NSN hardware and QOS is good).
3.Data in erlang for one time slot and MAX data erlang in one TRX considering GOS.

ashwani sharma - 12th December 2013  (17:52 GMT)

Thanks pix,
for the info. I will check with Ericsson experts about Ready timer. Till now what i understand about this timer from Ericsson docs is as below:-
The READY timer controls the time a MS remains in READY state in the MS and the SGSN. The value of the READY timer may be negotiated between the MS and the network using the GPRS attach or GPRS routing area updating procedure. The default value is used if neither the MS nor the network send another value, or if the network sends this value.
Please do let me know about this parameter. what should be the ideal value? and does it impact any other KPI?

pix - 4th December 2013  (06:16 GMT)

Hi,

the only one i know is the T_READY timer. It's the only one from SGSN that I know of, and I know it has an impact on GPRS QoS. Increasing it should decrease the number of TBF establishments, therefore affecting your TBF estab sr.

Regards

pix

ashwani sharma - 3rd December 2013  (15:20 GMT)

hi! freinds

Is there any parameter in SGSN that can improve the TBF success rate. Or let me ask in this way that is there any parameter of SGSN that can anyway effect TBF success rate.

Parth - 26th November 2013  (12:44 GMT)

Pl suggest how to improve TBF Drop

prasad - 12th July 2013  (16:04 GMT)

How to improve TBF drop in NSN BSCs,
Pls suggest timers which can be changed.

Deb - 10th June 2013  (10:51 GMT)

Recently Huawei has shared this formula for TBF drop:

downlink:
(A9118+A9318)/(L9545+L9549+L9550+L9551+L9552+L9546+L9547+L9548)
uplink:
(A9006+A9007+A9206+A9207)/ (L9441+L9445+L9446+L9447+L9448+L9442+L9443+L9444)

is this OK for use. To me it looks OK.

Agha - 30th May 2013  (11:11 GMT)

Hi KP,
which is suitable for link adaption either LA or IR for bad radio condition ?

KP - 27th May 2013  (13:01 GMT)

Enable the link adaption and check whether the situation is improved or not.
Reg,

pix - 16th March 2013  (18:05 GMT)

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

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