UE LTE registration failure Problem Analysis using high-level UE logs

 

Problem Analysis using high-level UE logs

When the above LTE registration test scenario is executed, the following output is received with high-level details. However, only the “registration denied” status is conveyed from the registration attempt, and the root reason for the failure remains unknown.

 Running test scenario BCALL VoLTE DeREG VoLTE 01

                    Signal Strength ... ✔ OK in  2.504s | 87

                    Getting IMSI ... ✔ OK in  2.705s |   134550007900125 OK  

                    Attaching to LTE ... ✖ FAILED in  16.863s | Status: Registration denied, +CEREG: 0, 3

 Execution completed

Problem Analysis using detailed device log

• Obtain the UE device logs and decode the logs.
• Analyse the decoded logs and verify that the Attach Request is rejected due to the core network rejection for the attach request with cause of "#8" EPS services and non-EPS services not allowed.