3GPP 24.501 v20.0.0 — the document's own text
8.2.30.13 Paging restriction
Taught in 4. Inside TS 24.501, the document at the centre (CT1 — the group that writes what your phone says, overview).
The UE shall include this IE if the Request type is set to "NAS signalling connection release" or to "Rejection of paging" in the UE request type IE and the UE requests the network to restrict paging.