Call Drop VoLTE Due To UE Lost With Good Radio Condition

[phuc]

Dear Expert,
We face an issue related to drop VoLTE call continuously due to UE lost with good radio condition (vendor E//). It happened continuously at sometimes ( with some models: SAMSUNG SM-M205G/DS,SAMSUNG SM-N975F/DS...).
Example log trace 4G VoLTE E//. Cell has 14 drops VoLTE/ 74 attempt, all drops belong to 1 UE (SAMSUNG SM-M205G/DS).
1. Radio condition: RSRP ~ -95 dBm, RSRQ ~ -12 dB.
2. Time: Sometime but if occur it drops continuously.
3. Model: SM-M205G/DS

Included log celltrace, help me figure out root cause (parameter, device). Thank you very much.

Log_drop.zip

Capture.jpg

[justdream]

if I remember well, I read before about similar case happened because Samsung UEs have such a problem
try to compare with another UE brand and see you will get same problem or not

[phuc]

Thank you Justdream,
Any ideas to solve this issue ?

[justdream]

no idea about solution for such cases as long as it is UE issue

[dennielone]

Any disconnect cause in the SIP?

[rffreeconsult]

UE models from different manufacturers have a diverse range of RxLev (RSCP or RSRQ) sensitivities. If the tests on a different UE reveal no drops, it means the Samsung UE has issues either with software upgrades that does not "drive" the UE correctly to detect the radio levels and conditions...or there is a bug in the operating systems upgrade (either by the carrier and UE manufacturer-SAMSUNG here).

[dennielone]

It is good to joint test and have both UE and network log for troubleshooting.