Embodiments of the present disclosure provide external parameters for an Application Function (AF) session in a more efficient and dynamic manner. A method of operation of the AF comprises transmitting a request to a Network Exposure Function (NEF). Herein, the request comprises information indicating one or more User Equipments (UEs). Herein, the one or more UEs may include a UE that has not established a Protocol Data Unit (PDU) session yet. The information indicating the one or more UEs includes a UE ID for a specific UE, a group UE ID for multiple UEs, or a UE indication indicating any UE, and optionally includes one or more conditions defining geographic zones and/or time windows.