3GPP 24.501 v20.0.0 — the document's own text
8.3.7.18 Non-3GPP device information
Taught in 4. Inside TS 24.501, the document at the centre (CT1 — the group that writes what your phone says, overview).
This IE shall be included in the message when the UE requests QoS differentiation of traffic or requests suspend of QoS differentiation of traffic from one or more non-3GPP devices connecting through the UE.