3GPP 23.501 v20.2.0 — the document's own text
5.19.7.5 Group specific NAS level congestion control
Taught in 27. Overload, energy, deployment and the rest (The 5G system architecture, in depth).
The group specific NAS level congestion control applies to a specific group of UEs. Group specific NAS level congestion control is performed at the 5GC only and it is transparent to UE. The AMF or SMF or both may apply NAS level congestion control for a UE associated to an Internal-Group Identifier (see clause 5.9.7).
NOTE: 5GC logic for Group specific NAS level congestion control is not described in this Release of the specification.