6 Reference Architecture

29.5613GPP5G SystemInterworking between 5G Network and external Data NetworksRelease 17Stage 3TS

Figure 6-1 shows the access interfaces for the 5G Network. Figure 6-2 shows the access interfaces for the 5G and EPC interworking network.

The 5G Network includes both the 3GPP access and the non-3GPP access.

The NSS-AAA may belong to the H-PLMN in the 5G Network (without AAA-P interworking) or a 3rd party (with AAA-P interworking).

Figure 6-1: Reference Architecture for 5G Network Interworking

Figure 6-2: Reference Architecture for 5G and EPC Interworking

NOTE 1: The SMF represents the H-SMF and the SMF+PGW-C represents the H-SMF+ H-PGW-C in the home routed scenario.

NOTE 2: If the DN-AAA server located in 5GC or in the external PDN is reachable directly, then the SMF can communicate with the DN-AAA server directly without involving the UPF, applicable to all the message flows on N6 interface in clause 11 and clause 12 in this specification.