Question: In a TDD/FDD handover scenario, if the UE receives an RRC message with an activation time later than the RRC procedure delay seconds from the end of the last TTI containing the RRC command, what determines when the UE should start transmitting the new uplink DPCCH?
Option 1: Immediately after receiving the RRC message
Option 2: At the designated activation time + interruption time
Option 3: After Dhandover seconds from the end of the last TTI containing the RRC command, regardless of the activation time
Option 4: Based on the UE's current power status and buffer occupancy
Explanation: According to the specified behavior for TDD/FDD handovers with delayed access, if the indicated activation time is later than the RRC procedure delay seconds from the end of the last TTI containing the RRC command, the UE's readiness to start transmitting the new uplink DPCCH is determined by adding the interruption time to the designated activation time. This ensures a coordinated and smooth handover process, taking into account both the scheduled activation and any necessary pause (interruption time) before initiating the new transmission.