3GPP 24.501 v20.0.0 — the document's own text
8.2.16.6 UE request type
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 MUSIM UE requests the release of the NAS signalling connection or rejects the paging request from the network.