Hi Experts,
What are the best RSRP/CQI level to have MOS better than 3.5?
Look for SINR, it shouldn’t be negative - at least greater then 0 db.
Any global results or establishment.
What are the best RSRP level for MOS >3?
It is not related to RSRP but to SINR and CQI for both parties UL and DL.
Yes, it’s linked with SINR.
You need to have a view on both A party and B party.
And you cannot measure UL SINR.
All you can do is to look at PHR of the UE and PUSCH values.
We have UL SINR KPI as well for PUCCH / PUSCH.
Calculated at eNB end.
Yes, at eNB sure, but at UE log you cannot see this.
Yes no, in UE log only DL SINR.
For UE log all you can do is to look at PHR of the UE and PUSCH values and look at BSR.
For all complaints of mute calls, voice breaks we observed if RSRQ is above -16/-17 then UE will have issues on VoLTE irrespective of RSRP.
Any good level of PUSCH SINR, CQI vs MOS concluded.
It’s observed at poor SINR (-4 to -6 db ) RTP packets having dl/ul bytes reached 0 reason for most of volte issues in field.
Whether it’s poor mos, mute call, one way audio, call drop, etc.
I seen same correlation in edat tool where we can see RTP packet field as well.
By coverage optimization we can kill most of VoLTE related issues.
Whether it’s overlapping/overshooting / number of users reduction, etc.
Parameter wise we can play with handover thresholds, srvcc thresholds for VoLTE.
Main parameter is tdiscard timer for PDCP, very helpful in reduction of mute call.
What’s the best value of SRVCC thresholds and SRVCC delay timer?
Please confirm your vendor.
What is IRAT setting, like A2 and B1 threshold?
Your network VoLTE settings must be higher than Data services:(D: -112dBm, V:-106dBm).
SRVCC delay timer 40 s.
Other thresholds I will confirm.
I remember we fine tuned B1 time to trigger for cells having poor SRVCC SR.
We have -118 PS and -114 VoLTE.
We are throwing VoLTE users early from TDD layer, i.e. at -104 ie A2 and B1 threshold -106.
We kept all VoLTE traffic on FDD only no VoLTE on TDD.
So SRVCC to 2G/3G I am keeping -118/-120 why to have leakage.
From LTE.
GSM should be better than -95.
Yes good! 