Feature Description

The PCF interfaces with the User Data Repository (UDR) to receive subscriber-related policies for User Equipment (UE) attach and session establishment. When a UE attaches to the network, AMF requires AM policies of the subscriber from PCF for the UE. Similarly, when a UE makes a PDU Session, SMF requires policy rules from PCF. Subscriber attributes are stored in the UDR. PCF communicates with UDR to receive these attributes which are used in the evaluation of policies.

PCF invokes the Nudr_DataRepository service to retrieve the AM and SM Policy attributes. PCF carries out the discovery of UDR URL through the Nnrf_NFDiscovery service which is NRF service.