School of Specs 24.501v20.0.0

3GPP 24.501 v20.0.0 — the document's own text

5.4.4.5 Abnormal cases in the UE

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:

  • Transmission failure of the CONFIGURATION UPDATE COMPLETE message with TAI change from lower layers

If the current TAI is not in the TAI list, the generic UE configuration update procedure shall be aborted and a registration procedure for mobility and periodic registration update shall be initiated.

If the current TAI is still part of the TAI list, it is up to the UE implementation how to re-run the ongoing procedure that triggered the generic UE configuration update procedure.

  • Transmission failure of CONFIGURATION UPDATE COMPLETE message indication without TAI change from lower layers

It is up to the UE implementation how to re-run the ongoing procedure that triggered the generic UE configuration update procedure.

  • Generic UE configuration update and de-registration procedure collision

If the UE receives CONFIGURATION UPDATE COMMAND message after sending a DEREGISTRATION REQUEST message and the access type included in the DEREGISTRATION REQEUST message is same as the access in which the CONFIGURATION UPDATE COMMAND message is received, then the UE shall ignore the CONFIGURATION UPDATE COMMAND message and proceed with the de-registration procedure. Otherwise, the UE shall proceed with both the procedures.

  • Void
  • Generic UE configuration update and service request procedure collision

If the SERVICE REQUEST message does not include UE request type IE with Request type value set to "NAS signalling connection release" and the UE receives a CONFIGURATION UPDATE COMMAND message before the ongoing service request procedure has been completed, the UE shall proceed with both the procedures.

If the SERVICE REQUEST message includes UE request type IE with Request type value set to "NAS signalling connection release" and the UE receives a CONFIGURATION UPDATE COMMAND message before the ongoing service request procedure has been completed, the UE shall ignore the CONFIGURATION UPDATE COMMAND message and proceed with the service request procedure.

  • "CAG information list" is received and the UE is operating in SNPN access operation mode

If the UE receives the CAG information list IE in the CONFIGURATION UPDATE COMMAND message and the UE is operating in SNPN access operation mode, the UE shall ignore the content of CAG information list IE.