Question: In MBMS, what is the primary purpose of including specific parameters in a service announcement sent to User Equipment (UE)?
Option 1: To enable the UE to randomly select its joining time, preventing overload in the Serving GPRS Support Node (SGSN), Gateway GPRS Support Node (GGSN), and Broadcast/Multicast Service Centre (BM-SC).
Option 2: To provide the UE with a list of available multimedia content for manual selection.
Option 3: To initiate an immediate join response from all UEs receiving the announcement, ensuring simultaneous service start.
Option 4: To update UEs on network maintenance schedules affecting MBMS services.
Explanation: Including specific parameters in service announcements allows the BM-SC to manage the timing of UEs joining a service. By enabling UEs to randomly select their join time based on these parameters, the network prevents sudden, simultaneous joins that could overload critical infrastructure components like SGSN, GGSN, and BM-SC, ensuring smoother service initiation and maintaining network stability.