5G Binding Support: enables scaling the policy/charging network . The 5G Binding Support Function (BSF) is comparable with the Session Binding Function on the Diameter Routing Agent (DRA) used in 4G. It becomes a mandatory requirement when multiple Policy Control Function (PCF) systems are deployed in the network.
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N5: Reference point between the PCF and an AF . N7: Reference point between the SMF and the PCF. N8: Reference point between the UDM and the AMF. N10: Reference point between the UDM and the SMF. N11: Reference point between the AMF and the SMF.
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