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Enable the link adaption and check whether the situation is improved or not.
Reg,Hi KP,
which is suitable for link adaption either LA or IR for bad radio condition ?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.
How to improve TBF drop in NSN BSCs,
Pls suggest timers which can be changed.Pl suggest how to improve TBF Drop
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.
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
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?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.Please suggest action plan to improve TBF drop rate in Huawei system .
hi everyone ,
i am facing high TBF drop rate on some sites in one bsc.on the other hand TBF success rate is ok.kindly share me any suggestion for getting drop rate down.Although payload is maintained, TBF attempts showing a reduction after SGSN migration
how can i improve UL TBF success rate
Inputs to help with TBF dropping for GSM.
– Make sure no Hardware problem especially related TRX module. You need to fix Hardware issue first if you found hardware problem
– Make sure no Interference. You have to do re-tune or change frequency that suspected Frequency Interference to improve TBF drop rate
– Make sure No overshooting Cells. You can adjust Antenna Tilt/Down tilt for overshooting cells to improve TBF drop rate and avoid access traffic in low RX level thus can improve TBF drop call.
– Reduce Dynamic PDCH(MAXPDCHRATE) and add static PDTCH to avoid preemption channel by voice services especially for cells with high Voice traffic.
-Shifting Static PDCH from TRX non BCCH to TRX BCCH and make priority setting by set TRX layering priority which can be set by OPTL value in GTRXDEV object.With this strategy data services will be concentrated in TRX BCCH with full power(no power control) thus can improve TBF drop rate and getting better than data services in TRX non BCCH.how to improve TBF drop
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