School of Specs 23.501v20.2.0

3GPP 23.501 v20.2.0 — the document's own text

8.2.5 Control Plane for trusted non-3GPP Access

Taught in 8. What actually travels on the wire (The 5G system architecture, in depth).

Figure 8.2.5-1: Control Plane before the NWt connection is established between UE and TNGF
Figure 8.2.5-1: Control Plane before the NWt connection is established between UE and TNGF
Figure 8.2.5-2: Control Plane after the NWt connection is established between UE and TNGF
Figure 8.2.5-2: Control Plane after the NWt connection is established between UE and TNGF

Large NAS messages may be fragmented by the "inner IP" layer or by TCP.

Figure 8.2.5-3: Control Plane for establishment of user-plane via TNGF
Figure 8.2.5-3: Control Plane for establishment of user-plane via TNGF

In the above figures 8.2.5-2 and 8.2.5-3, the UDP protocol may be used between the UE and TNGF to enable NAT traversal for IKEv2 and IPsec traffic.

The NWt connection is defined in clause 4.2.8.3 and in clause 4.12a.2.2 of TS 23.502 [3].