Question: In a TDD/TDD inter-frequency handover scenario, what is the primary factor that influences the interruption time (Tinterrupt) when the target cell's SFN needs to be decoded by the UE?
Option 1: Type of handover command (intra/inter-frequency)
Option 2: Whether the target cell is known or unknown to the UE, affecting the KC and UC values
Option 3: The frame timing uncertainty between cells (Toffset) and the time until UL timeslot appearance (TUL)
Option 4: Requirement for SFN decoding (FSFN), directly adding a fixed duration (30*FSFN ms) to Tinterrupt
Explanation: The correct answer highlights that when the target cell's System Frame Number (SFN) needs to be decoded, it directly impacts the interruption time by adding a specific duration (30*FSFN ms) to Tinterrupt, introducing an additional delay for ensuring synchronization with the target cell.