Question: In a scenario with multiple active MBMS bearers for a VAL (Vertical Application Layer) service in the same area, what is the recommended method for announcing additional MBMS bearers to the NRM client?
Option 1: Always use a unicast bearer for all MBMS bearer announcements to ensure interactive feedback.
Option 2: Utilize an existing MBMS bearer designated for application-level control signaling, with adjusted QoS settings prioritizing packet loss sensitivity.
Option 3: Cycle through available unicast bearers to distribute the announcement load and enhance security.
Option 4: Suspend announcements when multiple MBMS bearers are active, relying on initial setup configurations.
Explanation: This approach is preferred in scenarios with multiple active MBMS bearers for VAL services. Using an MBMS bearer for application-level control signaling (with tailored QoS settings to mitigate packet loss) efficiently announces additional bearers without the overhead of unicast bearers, which are more suited for interactive or initial setup needs. This method balances resource utilization with the sensitivity of control signaling.