Question: In a UMTS FDD (Frequency Division Duplex) network, what event marks the end of the timeframe used to measure the hard handover delay of a User Equipment (UE)?
Option 1: Receipt of the first TTI (Transmission Time Interval) containing an RRC (Radio Resource Control) message implying hard handover at the new cell.
Option 2: Transmission of the last TTI containing an RRC message implying hard handover from the source cell.
Option 3: Successful decoding of the first downlink DPCCH (Dedicated Physical Control Channel) from the target cell.
Option 4: Transmission of the new uplink DPCCH to the target cell.
Explanation: The hard handover delay in a UMTS FDD network is specifically measured until the UE successfully initiates communication with the new cell, which is marked by the transmission of the new uplink DPCCH. This event signifies the completion of the handover process from the UE's perspective, making it the correct endpoint for measuring hard handover delay.