3GPP 23.501 v20.2.0 — the document's own text
8.3.6 User Plane for Trusted WLAN Access for N5CW Device
Taught in 8. What actually travels on the wire (The 5G system architecture, in depth).

Legend:
- Transport: this layer refers to the transport of PDUs between the N5CW device and TWIF (see clause 4.2.8.5.4).
In this Release of the specification, Trusted WLAN Access for N5CW Device only supports IP PDU Session type.