Section: 5.3.2.2.3 RM-REGISTERED state
Content: In the RM-REGISTERED state, the UE is registered with the network. In the RM-REGISTERED state, the UE can receive services that require registration with the network. In the RM-REGISTERED state, the UE shall: - perform Mobility Registration Update procedure if the current TAI of the serving cell (see TS 37.340[ Evolved Universal Terrestrial Radio Access (E-UTRA) and NR; Multi-connectivity; Overall Description; Stage-2 ]  [31]) is not in the list of TAIs that the UE has received from the network in order to maintain the registration and enable the AMF to page the UE; NOTE: Additional considerations for Mobility Registration Update in case of NR satellite access are provided in clause 5.4.11.6. - perform Periodic Registration Update procedure triggered by expiration of the periodic update timer to notify the network that the UE is still active. - perform a Mobility Registration Update procedure to update its capability information or to re-negotiate protocol parameters with the network; - perform Deregistration procedure (see clause 4.2.2.3.1 of TS 23.502[ Procedures for the 5G System (5GS) ]  [3]), and enter RM-DEREGISTERED state, when the UE needs to be no longer registered with the PLMN. The UE may decide to deregister from the network at any time. - enter RM-DEREGISTERED state when receiving a Registration Reject message or a Deregistration message. The actions of the UE depend upon the cause value' in the Registration Reject or Deregistration message. See clause 4.2.2 of TS 23.502[ Procedures for the 5G System (5GS) ]  [3]. When the UE RM state in the AMF is RM-REGISTERED, the AMF shall: - perform Deregistration procedure (see clauses 4.2.2.3.2, 4.2.2.3.3 of TS 23.502[ Procedures for the 5G System (5GS) ]  [3]), and enter RM-DEREGISTERED state for the UE, when the UE needs to be no longer registered with the PLMN. The network may decide to deregister the UE at any time; - perform Implicit Deregistration at any time after the Implicit Deregistration timer expires. The AMF shall enter RM-DEREGISTERED state for the UE after Implicit Deregistration; - when applicable, accept or reject Registration Requests or Service Requests from the UE.