Section: 5.3.2.2.2 RM-DEREGISTERED state
Content: In the RM-DEREGISTERED state, the UE is not registered with the network. The UE context in AMF holds no valid location or routing information for the UE so the UE is not reachable by the AMF. However, some parts of UE context may still be stored in the UE and the AMF e.g. to avoid running an authentication procedure during every Registration procedure. In the RM-DEREGISTERED state, the UE shall: - attempt to register with the selected PLMN using the Initial Registration procedure if it needs to receive service that requires registration (see clause 4.2.2.2 of TS 23.502[ Procedures for the 5G System (5GS) ]  [3]). - remain in RM-DEREGISTERED state if receiving a Registration Reject upon Initial Registration (see clause 4.2.2.2 of TS 23.502[ Procedures for the 5G System (5GS) ]  [3]). - enter RM-REGISTERED state upon receiving a Registration Accept (see clause 4.2.2.2 of TS 23.502[ Procedures for the 5G System (5GS) ]  [3]). When the UE RM state in the AMF is RM-DEREGISTERED, the AMF shall: - when applicable, accept the Initial Registration of a UE by sending a Registration Accept to this UE and enter RM-REGISTERED state for the UE (see clause 4.2.2.2 of TS 23.502[ Procedures for the 5G System (5GS) ]  [3]); or - when applicable, reject the Initial Registration of a UE by sending a Registration Reject to this UE (see clause 4.2.2.2 of TS 23.502[ Procedures for the 5G System (5GS) ]  [3]).