Question: In an NR (New Radio) network, during an inter-frequency handover from an NR FR2 cell to an NR FR1 cell, what is the key factor determining the timeline for a UE (User Equipment) to start transmitting on the new uplink PRACH (Physical Random Access Channel) after receiving a handover command?
Option 1: The applicable RRC (Radio Resource Control) procedure delay plus the interruption time.
Option 2: The UE's current connection bandwidth in the source cell.
Option 3: The target NR FR1 cell's load level at the time of handover.
Option 4: The number of active bearers for the UE during the handover process.
Explanation: This is because the timeline for the UE to start transmitting on the new uplink PRACH after receiving a handover command is determined by adding the applicable RRC procedure delay to the interruption time, ensuring a coordinated and efficient handover process, minimizing service interruption.