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

4.3.4.2 Roaming architectures

Taught in 19. Living next to 4G (The 5G system architecture, in depth), 7. Roaming, other accesses, the edge and the outside (The 5G system architecture, overview).

Figure 4.3.4.2-1 represents the Roaming architecture with local breakout and Figure 4.3.4.2-2 represents the Roaming architecture with home-routed traffic for interworking between ePDG/EPC and 5GS.

Figure 4.3.4.2-1: Local breakout roaming architecture for interworking between ePDG/EPC and 5GS

NOTE 1: The details of the interfaces between the UE and the ePDG and between EPC nodes (i.e. SWm, SWd, SWx, S2b and S6b), are documented in TS 23.402 [43].

NOTE 2: Interworking with ePDG is only supported with GTP based S2b. S6b interface is optional (see clause 4.11.4.3.6 of TS 23.502 [3]).

Figure 4.3.4.2-2: Home-routed roaming architecture for interworking between ePDG/EPC and 5GS

NOTE 1: The details of the interfaces between the UE and the ePDG and between EPC nodes (i.e. SWm, SWd, SWx, S2b and S6b), are documented in TS 23.402 [43].

NOTE 2: Interworking with ePDG is only supported with GTP based S2b. S6b interface is optional (see clause 4.11.4.3.6 of TS 23.502 [3]).