Question: What constitutes the Handover Delay (Dhandover) in E-UTRAN when a UE receives an RRC message for handover to HRPD?
Option 1: The sum of the RRC procedure delay and the interruption time.
Option 2: The time between the end of the last E-UTRAN TTI containing the RRC command and the UE starting transmission in HRPD, without any additional delays.
Option 3: The interruption uncertainty when changing timing from E-UTRAN to HRPD (TIU) plus the reverse link silence interval.
Option 4: The total time for the UE to measure an unknown target HRPD cell and complete the handover.
Explanation: The Handover Delay (Dhandover) is defined as the sum of two components: the RRC procedure delay, which has a fixed value of 50 ms, and the interruption time, varying based on conditions like whether the target cell is known or unknown to the UE.