Question: In a 4G network, when implementing Downlink (DL) traffic throttling for non-priority traffic of UEs in idle mode, what determines whether the Serving Gateway Control plane (SGW-C) sends a Downlink Data Notification (DDN) to the Mobility Management Entity (MME)?
Option 1: The availability of network resources and the UE's Quality of Service (QoS) profile.
Option 2: The bearer's Access Point Name (APN) and the user's subscription type.
Option 3: The MME's load balancing requirements and the time of day.
Option 4: The bearer's Allocation and Retention Priority (ARP) level and operator policy.
Explanation: The decision for the SGW-C to throttle Downlink Data Notifications is based on the priority of the traffic, determined by the bearer's ARP level, combined with operator-defined policies, ensuring efficient network resource utilization while maintaining service quality for priority traffic.