5.4.11.9 N2 interface and connection management for regenerative satellite payload

The NG Removal procedure defined in TS 38.413 [34] can be used to remove the interface between a gNB and an AMF in a controlled manner, e.g. when the gNB is leaving the service area of an AMF when using regenerative satellite payload.

The serving AMF for a UE can remain the same during feeder link switchover.

NOTE 1: If a gNB IP address changes due to feeder link switchover, then the procedures described in e.g. clause 5.21.1 can be used.

NOTE 2: RAN transitioning between different NTN GWs, TAIs and potentially between AMFs can be supported by using existing procedures, e.g. the gNB releasing UEs to CM-IDLE before changing NTN gateway, or by using existing load re-balancing, triggering handover when it realizes it is going to leave a tracking area due to its own movement, etc.