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.

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