Reference point between the N5CW devices and the TWAP. It is defined in clause 188.8.131.52.
Reference point between the UE and N3IWF for establishing secure tunnel(s) between the UE and N3IWF so that control-plane and user-plane exchanged between the UE and the 5G Core Network is transferred securely over untrusted non-3GPP access.
Reference point between the UE and the TNGF. A secure NWt connection is established over this reference point, as specified in clause 4.12a.2.2 of TS 23.502. NAS messages between the UE and the AMF are transferred via this NWt connection.
A reference point between the TNAP and the TNGF, which is used to support an AAA interface. Ta requirements are documented in clause 184.108.40.206.2.
A reference point between two TNGFs, which is used to facilitate UE mobility between different TNGFs (inter-TNGF mobility).
Tn and inter-TNGF mobility are not specified in this Release of the specification.
Carry EAP-5G traffic and user location information before the NWt connection is established between the UE and the TNGF.
Allow the UE and the TNGF to exchange IP traffic.
In deployments where the TNAP does not allocate the local IP addresses to UE(s), Ta shall be able to:
Allow the UE to request and receive IP configuration from the TNAN (including a local IP address), e.g. with DHCP. This is to allow the UE to use an IP stack to establish a NWt connection between the UE and the TNGF.
In this Release of the specification, Ta is not specified.