3GPP 23.501 v20.2.0 — the document's own text
5.3.2.2.1 General
Taught in 9. Registration, reachability and paging (The 5G system architecture, in depth), 4. Knowing who you are and where you are (The 5G system architecture, overview), 3. What happens when a phone switches on (The 5G system architecture, quick start).
Two RM states are used in the UE and the AMF that reflect the registration status of the UE in the selected PLMN:
- RM-DEREGISTERED.
- RM-REGISTERED.