Question: In E-UTRA, during RRC connection release redirection to NR, what is the maximum allowed time for a UE to start transmitting PRACH to the target cell (Cell 2) after the beginning of the specified time period (T2), to meet the test requirements?
Option 1: Less than 1500 ms
Option 2: Less than 2000 ms
Option 3: Less than 2500 ms
Option 4: Less than 2240 ms
Explanation: To ensure compliance with the test requirements for RRC connection release redirection to NR, the UE must initiate PRACH transmission to Cell 2 within a tightly defined timeframe. This specific duration of less than 2240 ms is critical for meeting the 90% success rate for correct RRC connection release redirection, considering the cumulative delays from various procedures.