Question: In a scenario where a User Equipment (UE) is camped on a 3.84 Mcps TDD cell and then reselects to a GSM cell, what event marks the end of the cell re-selection delay period?
Option 1: When the UE's receiver detects a stronger signal from the target GSM cell.
Option 2: Upon completion of the handover procedure to the new GSM cell.
Option 3: When the UE initiates a call setup on the newly selected GSM cell.
Option 4: The moment the UE starts sending a LOCATION UPDATING REQUEST message for location update to the new GSM cell.
Explanation: According to telecom principles, the cell re-selection delay is measured until the UE takes a specific action following the detection of a better-ranked cell. In this context, initiating the LOCATION UPDATING REQUEST to perform a location update to the new cell signifies the UE's response to the changed cell quality levels, marking the end of the delay period. This highlights the importance of efficient location management in maintaining seamless connectivity during inter-system (e.g., TDD to GSM) handovers.