PDASR(Packet Data access Success Rate) also called TBF Success rate indicate Success percentage of Data call GPRS in GSM. This KPI is familiar in Indonesia especially in Hutchison Operator(HCPT) project if you work there for 2G GSM Enginer. In this note I would like to share how to improve Packet Data access Success rate(PDASR) in Huawei GSM Network.Please follow below step to improve PDASR.
Step 1: Check for PDCH Blocking or TBF Blocking due to No channel
PDCH Blocking indicate insufficient data channel for EDGE/GPRS services.For PDCH Blocking you can check also by counter TBF Blocking due to no channel. If you found TBF Blocking then you need to add Channel allocation for Data or you can add static PDCH channel and finally you need to upgrade TRX if found high PDCH blocking. Before propose upgrade TRX you need to change below parameter to improve PDASR.
-Increase MAXPDCHRATE to maximum value: ex: change to 90.
-Increase UPDYNCHNTRANLEV to maximum: 70
-Increase DWNDYNCHNTRANLEV to maximum: 80
-Increase PDCHDWNLEV to 160
-Increase PDCHUPLEV to 70
-Increase DNTBFRELDELAY
-Increase UPEXTTBFINACTDELAY
- Reduce PSServiceBusyThreshold to 10(give impact to low throughput)
Step 2: Check for TBF fail due to MS no response
TBF fail due to MS no response(UL/DL) occurred on cells due to some reasons such as: Frequency interference,Overshooting Cells or hardware problem.You need to check and clear Frequency interference,overshooting and hardware issue include transmission problem. If after check no problem such as mentioned the you need to optimize by parameter as below recommendation.
- Set DNDEFAULTMCS to MCS3(Give negative impact to DL PS throughput will be decreased)
- Set QUICKSTARTDLTBFONDL to ON(BSC Parameter), Give negative impact to increase of DL TBF drop rate
- Set QUICKSTARTDLTBFONUL to ON(BSC Parameter), Give negative impact to increase of DL TBF drop rate.
Don't forget to check initial step such as: Hardware, Overshooting, Frequency interference to improve all KPI include PDASR(Packet Data Acces Success Rate).
You might also Need to know:
- How to optimize Handover Success Rate(HOSR) in GSM Network
- Drop Call Rate improvement in 3G WCDMA by Parameter
- WCDMA CSSR Optimization tips
- Power Control Tril in GSM Huawei for Quality Improvement
Step 1: Check for PDCH Blocking or TBF Blocking due to No channel
PDCH Blocking indicate insufficient data channel for EDGE/GPRS services.For PDCH Blocking you can check also by counter TBF Blocking due to no channel. If you found TBF Blocking then you need to add Channel allocation for Data or you can add static PDCH channel and finally you need to upgrade TRX if found high PDCH blocking. Before propose upgrade TRX you need to change below parameter to improve PDASR.
-Increase MAXPDCHRATE to maximum value: ex: change to 90.
-Increase UPDYNCHNTRANLEV to maximum: 70
-Increase DWNDYNCHNTRANLEV to maximum: 80
-Increase PDCHDWNLEV to 160
-Increase PDCHUPLEV to 70
-Increase DNTBFRELDELAY
-Increase UPEXTTBFINACTDELAY
- Reduce PSServiceBusyThreshold to 10(give impact to low throughput)
Step 2: Check for TBF fail due to MS no response
TBF fail due to MS no response(UL/DL) occurred on cells due to some reasons such as: Frequency interference,Overshooting Cells or hardware problem.You need to check and clear Frequency interference,overshooting and hardware issue include transmission problem. If after check no problem such as mentioned the you need to optimize by parameter as below recommendation.
- Set DNDEFAULTMCS to MCS3(Give negative impact to DL PS throughput will be decreased)
- Set QUICKSTARTDLTBFONDL to ON(BSC Parameter), Give negative impact to increase of DL TBF drop rate
- Set QUICKSTARTDLTBFONUL to ON(BSC Parameter), Give negative impact to increase of DL TBF drop rate.
Don't forget to check initial step such as: Hardware, Overshooting, Frequency interference to improve all KPI include PDASR(Packet Data Acces Success Rate).
You might also Need to know:
- How to optimize Handover Success Rate(HOSR) in GSM Network
- Drop Call Rate improvement in 3G WCDMA by Parameter
- WCDMA CSSR Optimization tips
- Power Control Tril in GSM Huawei for Quality Improvement
Pls show KPI fomula about PDASR or TBF success rate
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