NF service operations: request/response and subscribe/notify

Two Communication Patterns in SBA

Network functions communicate using two fundamental patterns. Request-response is synchronous: a consumer NF sends an HTTP request using GET, POST, PUT, or DELETE to a producer NF and waits for the response before proceeding. This pattern suits operations like creating a PDU session context or fetching subscription data. Subscribe-notify is asynchronous: a consumer registers a callback URI with a producer and the producer pushes HTTP POST notifications to that callback whenever a subscribed event occurs, such as a UE changing location or a policy update being triggered.