Question: In an MBMS Session Start procedure for MBSFN operation, what action may an MCE take if it determines that radio resources are insufficient for establishing new MBMS services in its controlled area?
Option 1: Immediately send an error message to the MME and terminate the procedure.
Option 2: Pre-empt radio resources from other non-MBMS radio bearers according to Admission Control (AC) rules.
Option 3: Pre-empt radio resources from other ongoing MBMS service(s) according to Allocation and Retention Priority (ARP).
Option 4: Delay the procedure until sufficient resources become available without notifying the MME.
Explanation: In the context of MBSFN operation during an MBMS Session Start procedure, if the MCE finds insufficient radio resources for new MBMS services, it may decide to pre-empt resources from other ongoing MBMS services based on their Allocation and Retention Priority (ARP), ensuring efficient resource utilization while maintaining priority services.