4 Architecture considerations

32.2563GPP5G connection and mobility domain chargingCharging managementRelease 16Stage 2TS

4.1 High-level 5G System architecture

4.1.1 Non-roaming reference architecture

Figure 4.1.1.1 shows the 5G System high level architecture in the service-based representation, as defined in TS 23.501 [200], with AMF encompassing 5G registration, connection and mobility management functionalities:

Figure 4.1.1.1: 5G System architecture

4.1.2 Roaming reference architecture

Figure 4.1.2.1 shows the 5G System roaming architecture with local breakout in the service-based representation, as defined in TS 23.501 [200], with AMF encompassing 5G registration, connection and mobility management functionalities:

Figure 4.1.2.1: Roaming 5G System architecture- local breakout scenario in service-based interface representation

Figure 4.1.2.2 shows the 5G System roaming architecture in the case of home routed scenario the service-based representation, as defined in TS 23.501 [200], with AMF encompassing 5G registration, connection and mobility management functionalities:

Figure 4.1.2.2: Roaming 5G System architecture – home routed scenario in service-based interface representation

4.2 5G connection and mobility domain converged charging architecture

4.2.1 Non-roaming

Architectural options for 5G connection and mobility converged charging achieved by AMF embedding the CTF, are depicted in figure 4.2.1.1.

Figure 4.2.1.1: 5G connection and mobility converged charging architecture

Details on the interfaces and functions can be found in TS 32.240 [1] for the general architecture components. Ga is described in clause 5.2.4 and Bam in clause 5.2.5 of the present document, and Nchf is described in TS 32.290 [57].

4.2.2 Roaming

Figure 4.2.2.1 shows the 5G connection and mobility converged charging architecture in roaming service based representation:

Figure 4.2.2.1: 5G connection and mobility converged charging architecture in roaming

The architectural options of figure 4.2.1.1 apply with AMF located in VPLMN, V-CHF and corresponding Billing domain/CGF located in VPLMN.

The architectural options of figure 4.2.1.1 apply with AMF located in VPLMN, H-CHF and corresponding Billing domain/CGF located HPLMN. The Security Edge Protection Proxy (SEPP) specified in TS 23.501 [200] is used for inter-PLMN Nchf.

Figure 4.2.2.2 shows the 5G connection and mobility converged charging architecture in roaming, reference point representation:

Figure 4.2.2.2: 5G connection and mobility converged charging architecture in roaming – reference point representation

The N41 reference point is defined for the interactions between AMF and H-CHF in the reference point representation.

The N42 reference point is defined for the interactions between AMF and V-CHF in the reference point representation.