3GPP 23.501 v20.2.0 — the document's own text
8.2.2.2 UE - AMF
Taught in 8. What actually travels on the wire (The 5G system architecture, in depth).

Legend:
- NAS-MM: The NAS protocol for MM functionality supports registration management functionality, connection management functionality and user plane connection activation and deactivation. It is also responsible of ciphering and integrity protection of NAS signalling. 5G NAS protocol is defined in TS 24.501 [47]
- 5G-AN Protocol layer: This set of protocols/layers depends on the 5G-AN. In the case of NG-RAN, the radio protocol between the UE and the NG-RAN node (eNodeB or gNodeB) is specified in TS 36.300 [30] and TS 38.300 [27]. In the case of non-3GPP access, see clause 8.2.4.