Question: What is the primary condition for a UE to send an event-triggered measurement report over the Uu interface, according to radio resource management requirements for TDD?
Option 1: The reporting criteria are fulfilled, and there is available bandwidth on the uplink DCCH.
Option 2: The UE has completed a handover to a new cell, and the new cell requires an immediate report.
Option 3: A predefined time interval has elapsed since the last measurement report was sent.
Option 4: The UE's power level exceeds a certain threshold, necessitating an update.
Explanation: According to radio resource management requirements for TDD, the primary condition for sending event-triggered measurement reports is that the reporting criteria are fulfilled, optimizing network resource utilization by only sending reports when necessary.