Registration

To enable UE tracking and reachability, a UE must register with the authorized network to receive services.

  • Initial Registration—The AMF supports initial UE registration to 5GS network.

  • Mobility Registration Update—The AMF supports mobility registration update:

    • When changing to new Tracking Area (TA) outside the UE’s Registration Area in Connected/Idle state.

    • When the UE needs to update its capabilities or negotiated parameters.

    AMF also supports registration with AMF change.

  • Periodic Registration Update—The AMF supports periodic registration to the UE to confirm its availability. The procedure is controlled in the UE by the periodic registration update timer, T3512. The value of the T3512 timer is sent by the AMF to the UE in the Registration Accept message. The UE registers periodically as per the T3512 timer interval.

  • Emergency Registration—The AMF supports Emergency Registration without authentication/subscription.

The following feature is related to this use case: