Question: In E-UTRA handover testing, what is the maximum allowed time for a User Equipment (UE) to complete transmitting all repetitions of the Physical Random Access Channel (PRACH) to the target cell after initiating handover?
Option 1: Less than 30 ms from the start of the handover procedure
Option 2: Less than 50 ms from the beginning of time period T3
Option 3: Within 100 ms of receiving the handover command from the source cell
Option 4: Before the expiration of the RRC procedure delay (15 ms) plus any additional processing time
Explanation: This option correctly reflects the test requirement for E-UTRA handovers, ensuring the UE completes PRACH transmissions to the target cell within a tightly constrained timeframe (less than 50 ms from T3's start), crucial for minimizing handover delays and maintaining seamless connectivity.