Question: What is the maximum allowed interruption time for a UE to monitor downlink channels for paging reception during inter-frequency cell re-selection in a UTRAN environment, considering the time required to receive relevant system information?
Option 1: 20 ms
Option 2: TSI (Time for receiving system info) + 50 ms
Option 3: 100 ms
Option 4: TBCCH (Maximum time to read BCCH data in GSM) + 30 ms
Explanation: During inter-frequency cell re-selection, the UE needs to balance monitoring its current serving cell for paging with preparing to monitor the target cell. The correct answer accounts for both the time required to receive all relevant system information (TSI) and an additional 50 ms, ensuring a seamless handover without excessive interruption in receiving potential page messages.