RRC Setup Success Rate Improvement due to high L.RRC.SetupFail.NoReply in 4G LTE Huawei Network

Welcome back again to my blog. In this Article I would like to share about RRC Setup Success Rate Improvement in Worst performing cells (WPC) due to high rejection L.RRC.SetupFail.NoReply in 4G LTE Huawei. Rejection of  L.RRC.SetupFail.NoReply commonly due to coverage issue such as overshooting but I have experienced low RRC Setup Success Rate was due to low user(low sample) and the rejection still figure out by L.RRC.SetupFail.NoReply. Previously I was tried to clear up No reply by reset MRFU and swap MRFU to other sector (I thought may be because RF module problem because User's are very low) but still no improvement. I also did Physical tuning by down tilt Antenna 2 degree from previous configuration ( I thought may be due to coverage issue) and the result is nothing.Finally I get some improvement after reazimuth antenna and up tilt to get more user's.RRC setup success rate was improved,traffic increased and L.RRC.SetupFail.NoReply has cleared after reorientation and up tilt antenna.This action is working to improve RRC Setup Success Rate in cells with low user's(commonly L.Traffic.User.Avg less than 10).
Graph below is the result of RRC Setup Success Rate Improvement after Physical Optimization  ; Re-azimuth from 340 to 290 and  set  Total Tilt from 11 to 6 in 601116 sector-3.

From above chart Traffic and RRC setup SR have improved after Physical Optimization ; Re-azimuth from 340 to 290 and  set  Total Tilt from 11 to 6 on 15 November 2017,L.RRC.SetupFail.NoReply also decreased(improved). So in my opinion, here are the conclusion to improve RRC Setup Success Rate:

1. Check  number of user in counter L.Traffic.User.Avg, if less than 10 then try to reazimuth to potential coverage or up tilt to obtain more traffic.

2. Check TA coverage for cells with high number of user(L.Traffic.User.Avg>50),if found high TA then try reduce coverage by down tilt antenna(suspect low RRC setup SR due to overshooting).

3. Next action may be reset MRFU or try swap to other sector if suspect RF module issue.

If you have other solution or experienced in improving RRC Setup Success Rate,you can share or give feedback in comment,so will help other people in improving Network KPI.

You might also need to know:
4G-4G Traffic sharing for LTC(Low Throughput Cells) improvement in Huawei LTE
2G to 4G LTE Cell reselection Parameter setting in Huawei Network
Enable PS Redirection from 3G to 4G in Huawei Network
3G Call SetUp Time(CST) optimization by EFD state transition optimization in Huawei
3G UMTS/WCDMA Drop Call Rate Improvement(DCR CS/PS) in 3G Network Huawei
VQI Optimization Improvement by turn off Speech codec 5.9, 7.4 and 4.75 Kbps in Huawei 2G Network
VQI(Voice Quality Index) and Drop Call rate improvement in 2G Huawei by Setting more Full Rate and redimension channel
2G Theory and Concept
Common question about RF Optimization
TCH Block Rate Optimization Tips in Huawei GSM
2G Voice Quality Improvement by TRX Layering priority in Huawei GSM
TBF Drop Improvement tips in Huawei GSM
GPRS Packet Data Access Success Rate(PDASR) Improvement in Huawei GSM
Call Drop Rate improvement by Parameter change in 3G UMTS/WCDMA Huawei Network
Trial Power Control in GSM Huawei for Quality Improvement
Power Control activation for Electricity Saving in Huawei GSM
Handover Meaning in GSM and How to Optimize Handover Success Rate (HOSR) for GSM KPI Improvement
WCDMA CSSR Optimization Tips
CSSR Optimization for GSM and WCDMA
Drop Call Rate Optimization, How to identify and finding root cause for Optimization solution on GSM and UMTS Network

4G-4G Traffic sharing for LTC(Low Throughput Cells) improvement in Huawei LTE

In This Chapter I would like to share about LTC improvement by traffic sharing/offload traffic 4G-4G in Huawei 4G LTE. There are many way to improve throughput in 4G Huawei such as:Bandwidth Upgrade,Sharing traffic 4G-3G,sharing traffic 4G-4G(High traffic 4G cells to surroundings low traffic), Parameter adjustment such as:activate EPFENHANCEDSWITCH,Clearing overshooting,Upgrade transmission Capacity,Physical traffic sharing(antenna adjustment) and etc.

User DL Throughput will be improved by traffic sharing only if surroundings cells are in light load(not high traffic) because traffic shifting from cells with low throughput  to surroundings cells with low traffic and high throughput. Choose candidate cells for sharing traffic manually in map to maximize the result.Here are parameter setting that need to be set for 4G sharing traffic in Huawei LTE:

Parameter setting in cells LTC(Low Throughput cells):

Parameter setting in Candidate cells:

Script for Source_Congested cells:MOD EUTRANINTRAFREQNCELL: LocalCellId=XX, Mcc="YYY", Mnc="ZZ", eNodeBId=AA, CellId=BB, CellIndividualOffset=dB10, CellQoffset=dB-10, CellMeasPriority=HIGH_PRIORITY;  {NE Name}

Script for Target Non-Congested cells: MOD EUTRANINTRAFREQNCELL: LocalCellId=XX, Mcc="YYY", Mnc="ZZ", eNodeBId=AA, CellId=BB, CellIndividualOffset=dB-10, CellQoffset=dB10;  {NE NAME}

Fallback Script:

MOD EUTRANINTRAFREQNCELL: LocalCellId=XX, Mcc="YYY", Mnc="ZZ", eNodeBId=AA, CellId=BB, CellIndividualOffset=dB0, CellQoffset=dB0;  {NE NAME}

Here are the result after sharing traffic/offload 4G traffic to surroundings:

Mostly User DL throughput improved in cell level and traffic move to surroundings

Parameter Description:

CellIndividualOffset:

Indicates the cell individual offset for the inter-frequency neighboring cell, which is used in evaluation for handovers. It affects the probability of triggering inter-frequency measurement reports. A larger value of this parameter indicates a higher probability.

Impact on radio Network:

A larger value of this parameter results in a larger probability of triggering measurement reporting and handovers, increasing the number of handovers. A smaller value of this parameter results in the opposite effects. Whether the value of this parameter is too large or too small, the handover success rate decreases

CellQoffset:Indicates the offset for the inter-frequency neighboring cell, which is used in evaluation for cell reselections. A larger value of this parameter results in a lower probability of cell reselections. If this parameter is not set to dB0, it is delivered in SIB5. For details, see 3GPP TS 36.331. If this parameter is set to dB0, it is not delivered in SIB5. In this situation, UEs use 0 dB as the offset for cell reselections.

Impact on radio Network:

A larger value of this parameter leads to a lower probability of reselections to an inter-frequency neighboring cell. A smaller value leads to the opposite effects. Whether the value of this parameter is too large or too small, the access success rate of the inter-frequency neighboring cell decreases

CellMeasPriority:

Indicates the priority of measurement on the inter-frequency neighboring cell. The eNodeB preferentially contains the information about a neighboring cell with this priority set to HIGH_PRIORITY while delivering a measurement configuration

Impact on radio Network:

In the measurement configuration for an inter-frequency handover, the eNodeB includes information about a limited number of inter-frequency neighboring cells whose cell individual offsets (CIOs) are not zero. If this parameter is set to HIGH_PRIORITY and this neighboring cell has a non-zero CIO, it is more likely that this neighboring cell is included in the measurement configuration, thereby increasing the probability of a timely handover to this inter-frequency neighboring cell. If this neighboring cell is eventually not included in the measurement configuration, the UE uses zero as the CIO for this neighboring cell during handover evaluation, resulting in a delayed or premature handover to this neighboring cell.

Thank you for reading this chapter related Throughput improvement by 4G-4G Traffic sharing to solve LTC(low throughput cells) in Huawei 4G LTE Network, hope can helpful and improve your network.

You might also need to know:
2G to 4G LTE Cell reselection Parameter setting in Huawei Network
Enable PS Redirection from 3G to 4G in Huawei Network
3G Call SetUp Time(CST) optimization by EFD state transition optimization in Huawei
3G UMTS/WCDMA Drop Call Rate Improvement(DCR CS/PS) in 3G Network Huawei
VQI Optimization Improvement by turn off Speech codec 5.9, 7.4 and 4.75 Kbps in Huawei 2G Network
VQI(Voice Quality Index) and Drop Call rate improvement in 2G Huawei by Setting more Full Rate and redimension channel
2G Theory and Concept
Common question about RF Optimization
TCH Block Rate Optimization Tips in Huawei GSM
2G Voice Quality Improvement by TRX Layering priority in Huawei GSM
TBF Drop Improvement tips in Huawei GSM
GPRS Packet Data Access Success Rate(PDASR) Improvement in Huawei GSM
Call Drop Rate improvement by Parameter change in 3G UMTS/WCDMA Huawei Network
Trial Power Control in GSM Huawei for Quality Improvement
Power Control activation for Electricity Saving in Huawei GSM
Handover Meaning in GSM and How to Optimize Handover Success Rate (HOSR) for GSM KPI Improvement
WCDMA CSSR Optimization Tips
CSSR Optimization for GSM and WCDMA
Drop Call Rate Optimization, How to identify and finding root cause for Optimization solution on GSM and UMTS Network