3GPP 24.501 v20.0.0 — the document's own text
5.6.3.5 Abnormal cases on the UE side
Taught in 4. Inside TS 24.501, the document at the centre (CT1 — the group that writes what your phone says, overview).
The following abnormal cases can be identified:
- NOTIFICATION message received via non-3GPP access with access type indicating 3GPP access when UE-initiated 5GMM specific procedure or service request procedure over 3GPP access is ongoing.
The UE shall proceed with 5GMM specific procedure or service request procedure. If for registration procedure and service request procedure lower layers indicate that the access attempt is barred, then the UE shall handle the pending NOTIFICATION message as specified in clause 5.6.3.2. Otherwise, the UE shall ignore the NOTIFICATION message once lower layers confirms the establishment of the signalling connection.
- NOTIFICATION message received via non-3GPP access with access type indicating 3GPP access when the unavailability period is activated in the UE or the UE is about to activate unavailability period.
The UE shall respond with NOTIFICATION RESPONSE message over non-3GPP access indicating inability of the UE to initiate a service request procedure or a registration procedure over 3GPP access.