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Content for  TS 29.513  Word version:  17.1.0

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4  Reference architectureWord‑p. 10
The policy framework functionality in 5G is comprised of the functions of the Policy Control Function (PCF), the policy and charging enforcement functionality supported by the SMF and UPF, the access and mobility policy enforcement functionality supported by the AMF, the Network Data Analytics Function (NWDAF), the Network Exposure Function (NEF), the Charing Function (CHF), the Unified Data Repository (UDR) and the Application Function (AF). For the roaming scenario, the Security Edge Protection Proxy (SEPP) is deployed between the V-PCF and H-PCF. TS 23.503 specifies the 5G policy framework stage 2 functionality.
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Figure 4.1-1a: Overall non-roaming 5G Policy framework architecture (service based representation)
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Figure 4.1-1b: Overall non-roaming 5G Policy framework architecture (reference point representation)
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The Nchf service for online and offline charging consumed by the SMF is defined in TS 32.240.
The Nchf service for Spending Limit Control consumed by the PCF is defined in TS 29.594.
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Figure 4.1-2a: Overall roaming policy framework architecture - LBO (service based representation)
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Figure 4.1-2b: Overall roaming policy framework architecture - LBO (reference point representation)
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Figure 4.1-3a: Overall roaming policy framework architecture - home routed scenario (service based representation)
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Figure 4.1-3b: Overall roaming policy framework architecture - home routed scenario (reference point representation)
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To allow the 5G system to interwork with AFs related to existing services, e.g. IMS based services, Mission Critical Push To Talk services, the PCF shall support the corresponding Rx procedures and requirements defined in TS 29.214. This facilitates the migration from EPC to 5GC without requiring these AFs to upgrade to support the N5 interface.
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Figure 4.1-4: Interworking between 5G Policy framework and AFs supporting Rx interface
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