3GPP 23.501 v20.2.0 — the document's own text
5.31.15 Control Plane Data Transfer Congestion Control
Taught in 25. Small devices, small messages (The 5G system architecture, in depth).
NAS level congestion control may be applied in general for all NAS messages. To enable congestion control for control plane data transfer, a Control Plane data back-off timer is used, see clause 5.19.7.6.