3GPP 23.501 v20.2.0 — the document's own text
5.3.3.2.1 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 CM states are used to reflect the NAS signalling Connection of the UE with the AMF:
- CM-IDLE
- CM-CONNECTED
The CM state for 3GPP access and Non-3GPP access are independent of each other, i.e. one can be in CM-IDLE state at the same time when the other is in CM-CONNECTED state.