Question: What is the primary condition for a UE (User Equipment) to send an event-triggered measurement report over the Uu interface in a TDD (Time Division Duplexing) system?
Option 1: When the UE's power level exceeds a predefined threshold.
Option 2: Upon receiving a specific RRC (Radio Resource Control) signaling message from the network.
Option 3: At regular intervals, regardless of the reporting criteria fulfillment.
Option 4: Only when the reporting criteria are fulfilled, as defined in section 9 of the specifications.
Explanation: This is correct because, according to the specifications, the UE shall not send event-triggered measurement reports unless the reporting criteria (as outlined in section 9) are met. This ensures that reports are only transmitted when necessary, optimizing network resource utilization and reducing unnecessary signaling overhead.