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Content for  TS 23.222  Word version:  17.5.0

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6  Functional modelWord‑p. 20

6.1  GeneralWord‑p. 20

The Common API framework (CAPIF) functional architecture is described in this subclause. The CAPIF architecture is defined as service-based and interactions between the CAPIF functions are represented in two ways:
  • A service-based representation, where CAPIF functions enable other authorized CAPIF functions to access their services;
  • A reference point representation, where interactions between any two CAPIF functions (e.g. CCF, AEF) is shown by an appropriate point-to-point reference point (e.g. CAPIF-3).
The CAPIF functional architecture can be adopted by any 3GPP functionality providing 3GPP northbound service APIs.
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6.2  Functional model descriptionWord‑p. 21

6.2.0  Functional model description for the CAPIF |R16|Word‑p. 21

Figure 6.2.0-1 shows the reference point based functional model for the CAPIF.
Reproduction of 3GPP TS 23.222, Fig. 6.2.0-1: Functional model for the CAPIF
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The CAPIF is hosted within the PLMN operator network. The API invoker is typically provided by a 3rd party application provider who has service agreement with PLMN operator. The API invoker may reside within the same trust domain as the PLMN operator network.
In a reference point based model, the API invoker within the PLMN trust domain interacts with the CAPIF via CAPIF‑1 and CAPIF‑2. The API invoker from outside the PLMN trust domain interacts with the CAPIF via CAPIF‑1e and CAPIF‑2e. The API exposing function, the API publishing function and the API management function of the API provider domain (together known as API provider domain functions) within the PLMN trust domain interacts with the CAPIF core function via CAPIF‑3, CAPIF‑4 and CAPIF‑5 respectively.
Reproduction of 3GPP TS 23.222, Fig. 6.2.0-2: Functional model for interactions between API exposing functions
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As illustrated in Figure 6.2.0-2, the interactions between the API exposing functions within the PLMN trust domain is via CAPIF‑7.
The CAPIF core function provides CAPIF APIs to the API invoker over CAPIF‑1 and CAPIF‑1e. The API exposing function provides the service APIs to the API invoker over CAPIF‑2 and CAPIF‑2e.
The detailed information of the APIs provided by the CAPIF core function is specified in clause 10.
The security aspects of CAPIF reference points are specified in TS 33.122.
Figure 6.2.0-3 illustrates the CAPIF functional model using service-based interfaces.
Reproduction of 3GPP TS 23.222, Fig. 6.2.0-3: CAPIF functional model representation using service-based interfaces
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Table 6.2.0-1 specifies the service-based interfaces supported by CAPIF.
Service-based interface Entity APIs offered
CccfCAPIF core functionSpecified in subclause 10
CaefAPI exposing functionSpecified in subclause 11
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6.2.1  Functional model description to support 3rd party API providers |R16|Word‑p. 23

Figure 6.2.1-1 shows the functional model for the CAPIF to support 3rd party API providers.
Reproduction of 3GPP TS 23.222, Fig. 6.2.1-1: Functional model for the CAPIF to support 3rd party API providers
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The CAPIF core function in the PLMN trust domain supports service APIs from both the PLMN trust domain and the 3rd party trust domain having business relationship with PLMN. The API invokers may exist within the PLMN trust domain, or within the 3rd party trust domain or outside of both the PLMN trust domain and the 3rd party trust domain. The API provider domain 1 offers the service APIs from the PLMN operator. The API provider domain 2 offers the service APIs from the 3rd party. When the 3rd party API provider is a trusted 3rd party of the PLMN, the API provider domain 1 also offers the service APIs from the 3rd party.
The API invoker 2 within the PLMN trust domain interacts with the CAPIF core function via CAPIF‑1, and invokes the service APIs in the PLMN trust domain via CAPIF‑2 and invokes the service APIs in the 3rd party trust domain via CAPIF‑2e. The API invoker 3 within the 3rd party trust domain interacts with the CAPIF core function via CAPIF‑1e, and invokes the service APIs in the PLMN trust domain via CAPIF‑2e and invokes the service APIs in 3rd party trust domain via CAPIF‑2. The API invoker 1 from outside the PLMN trust domain and 3rd party trust domain, interacts with the CAPIF core function via CAPIF‑1e and invokes the service APIs in the PLMN trust domain and the service APIs in the 3rd party trust domain via CAPIF‑2e.
The API exposing function, the API publishing function and the API management function of the API provider domain 1 within the PLMN trust domain interacts with the CAPIF core function via CAPIF‑3, CAPIF‑4 and CAPIF‑5 respectively. The API exposing function, the API publishing function and the API management function of the API provider domain 2 within the 3rd party trust domain interacts with the CAPIF core function in the PLMN trust domain via CAPIF‑3e, CAPIF‑4e and CAPIF‑5e respectively. The API exposing function within the PLMN trust domain and the 3rd party trust domain provides the service APIs to the API invoker, offered by the respective trust domains.
The interactions between the API exposing functions within the PLMN trust domain is via CAPIF‑7 (not shown in the Figure 6.2.1-1 for simplicity). The API exposing function within the PLMN trust domain interacts with the API exposing function in the 3rd party trust domain via CAPIF‑7e.
The detailed information of the APIs provided by the CAPIF core function is specified in clause 10.
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6.2.2  Functional model description to support CAPIF interconnection |R16|Word‑p. 24

Figure 6.2.2-1 shows the architectural model for the CAPIF interconnection which allows API invokers of a CAPIF provider to utilize the service APIs from the 3rd party CAPIF provider.
Reproduction of 3GPP TS 23.222, Fig. 6.2.2-1: High level functional architecture for CAPIF interconnection with multiple CAPIF provider domains
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Figure 6.2.2-2 shows the architectural model for the CAPIF interconnection within the same CAPIF provider domain, which allows API invokers of CAPIF core function 1 to utilize the service APIs from CAPIF core function 2, where both CAPIF core function 1 and CAPIF core function 2 are hosted within the trust domain of the CAPIF provider A.
Reproduction of 3GPP TS 23.222, Fig. 6.2.2-2: High level functional architecture for CAPIF interconnection within a CAPIF provider domain
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The CAPIF provider A and CAPIF provider B host the CAPIF in their trust domains. A business relationship exists between the CAPIF providers.
The CAPIF providers in their respective trust domain hosts multiple CAPIF instances where each CAPIF instance consists of the CAPIF core function (local), the API provider domain and the API invokers. All interactions within the CAPIF instance is according to the functional model specified in subclause 6.2.0.
When multiple CAPIF instances are deployed by a CAPIF provider there may be a hierarchy associated with the multiple CAPIF core function deployed which allows:
  • the designated CAPIF core function of the CAPIF provider A to interconnect with the designated CAPIF core function of the CAPIF provider B; and
  • within CAPIF provider A, one or more CAPIF core function interacts with the designated CAPIF core function 1.
The designated CAPIF core function of the CAPIF provider A provides the information about the CAPIF instances and service APIs deployed by the CAPIF provider A to the designated CAPIF core function of the CAPIF provider B and vice versa over CAPIF‑6e reference point.
The CAPIF core function 2 of CAPIF provider A provides the information about the service APIs to the CAPIF core function 1 over CAPIF‑6 reference point.
The API invokers may exist within the trust domain of CAPIF provider A, or within the trust domain of CAPIF provider B or outside of the trust domains of both CAPIF provider A and CAPIF provider B. The API invoker of a CAPIF provider is onboarded with the CAPIF core function in the corresponding trust domain of the CAPIF provider.
One or more CAPIF core function can publish service APIs to the designated CAPIF core function over CAPIF‑6 reference point and, also discover the service APIs from the designated CAPIF core function and vice versa over CAPIF‑6 reference point.
The API invoker within the trust domain of CAPIF provider A interacts with the CAPIF core function of the CAPIF provider A via CAPIF‑1 and discovers the service APIs of both CAPIF providers, and invokes the service APIs in the trust domain of CAPIF provider A via CAPIF‑2 and invokes the service APIs in the trust domain of CAPIF provider B via CAPIF‑2e. The API invoker from outside the trust domain of CAPIF providers, interacts with the CAPIF core function of th CAPIF provider A via CAPIF‑1e and invokes the service APIs in the trust domain of the CAPIF providers via CAPIF‑2e.
The detailed information of the APIs provided by the CAPIF core function is specified in clause 10.
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