Section: 5.2.5.7.2 Npcf_EventExposure_Subscribe service operation
Content: Service operation name: Npcf_EventExposure_Subscribe. Description: The consumer NF uses this service operation to subscribe to or modify event reporting for a group of UE(s) or any UE accessing a combination of (DNN, S-NSSAI). NF Consumers: NEF. Inputs, Required: NF ID, Target of Event Reporting (Internal Group Identifier or indication that any UE accessing a combination of (DNN, S-NSSAI)is targeted, (set of) Event ID(s) defined in clause 5.2.5.7.1, Notification Target Address (+ Notification Correlation ID) and Event Reporting Information defined in Table 4.15.1-1. Inputs, Optional: Event Filter (s) associated with each Event ID, Expiry time. Outputs, Required: Operation execution result indication. When the subscription is accepted: Subscription Correlation ID, Expiry time (required if the subscription can be expired based on the operator's policy). Outputs, Optional: First corresponding event report is included, if corresponding information is available (see clause 4.15.1). The NF consumer subscribes to the event notification by invoking Npcf_EventExposure to the PCF. The PCF allocates a Subscription Correlation ID for the subscription and responds to the consumer NF with the Subscription Correlation ID. Event receiving NF ID identifies the NF that shall receive the event reporting.