Question: In the context of handover testing for a User Equipment (UE) moving at a speed of 30m/s, what is the primary condition that must be met for the UE to initiate transmission of the Physical Random Access Channel (PRACH) to Cell 2 within the specified time frame?
Option 1: The UE must have completed at least one successful RRC procedure with Cell 1.
Option 2: The distances D1-1 and D1-2 must both be less than 500m with a location margin of >=20m.
Option 3: The handover delay (DCHO) components, excluding TRRC, sum up to exactly 11660ms.
Option 4: The conditions for distances D1-1 and D1-2 are fulfilled with a location margin of at least 50m, prompting the UE to transmit PRACH to Cell 2 between 11670ms and 11741ms after T2 starts.
Explanation: This question requires understanding of the handover process. The correct answer highlights the crucial condition for initiating PRACH transmission to Cell 2: fulfilling D1-1 and D1-2 distance conditions with a sufficient location margin (>=50m) within the specified time frame, ensuring a successful handover. Other options are incorrect due to unrelated procedures, incorrect distance thresholds, or misinterpreted handover delay components.