3GPP 24.501 v20.0.0 — the document's own text
8.2.7.63 Negotiated LP-WUSPS assistance information
Taught in 4. Inside TS 24.501, the document at the centre (CT1 — the group that writes what your phone says, overview).
The network shall include the Negotiated LP-WUSPS assistance information IE if the network needs to provide the LP-WUSPS assistance information to the UE.