Question: In an Isolated Operation for Public Safety (IOPS) mode, how does a primary Mission Critical (MC) service server become aware of an active IOPS MC connectivity function after a backhaul failure?
Option 1: Through periodic broadcasts from the IOPS MC system within its coverage area.
Option 2: Via information provided by MC service users when they register to the primary MC service server after being recently registered to the IOPS MC connectivity function.
Option 3: Automatically, as the primary MC system continuously monitors for activations of IOPS MC connectivity functions within its coverage.
Option 4: Through direct notification from the network's Operation and Maintenance (O&M) system.
Explanation: In the context of IOPS mode, due to backhaul failure, direct communication between the primary MC system and the IOPS MC system is not possible. Therefore, reliance on user equipment (UE) - in this case, MC service users' devices - to convey information about the active IOPS MC connectivity function when they transition back to the primary MC system's coverage is a practical solution. This method allows the primary MC service server to gain awareness of the IOPS MC connectivity function's status without requiring direct connectivity with the IOPS MC system.