Question: In a cellular network, what event marks the end of the cell re-selection delay for a User Equipment (UE) transitioning to a new cell in an FDD system?
Option 1: When the UE's signal strength from the new cell surpasses that of the current cell.
Option 2: When the UE sends the RR Channel Request message for location update to the new cell.
Option 3: Upon completion of the handover procedure initiated by the network.
Option 4: Immediately after the UE detects a new cell with a stronger signal.
Explanation: The correct answer is Option 2 because, according to the definition, the cell re-selection delay ends when the change in cell levels results in the UE camping on a new cell and subsequently sending the RR Channel Request message for a location update to that new cell. This action signifies the UE's successful transition and initiation of registration with the new cell, marking the end of the cell re-selection delay.