Question: What condition must be met for a GSM cell's BSIC to be considered 'verified' by a UE requiring idle intervals for GSM measurements, after initial identification?
Option 1: The UE decodes the SCH of the BCCH carrier at least once every Tidentify abort seconds.
Option 2: The UE identifies the BSIC through initial BSIC identification and then re-confirms it at least once within the available idle intervals.
Option 3: The UE successfully performs initial BSIC identification and then re-confirms the BSIC at least once every Tre-confirm abort seconds.
Option 4: The UE measures the GSM carrier RSSI to a level above the reference sensitivity as specified in cellular standards for radio performance.
Explanation: For a UE requiring idle intervals for GSM measurements, after the initial BSIC identification, the BSIC is considered 'verified' if it is re-confirmed at least once every Tre-confirm abort seconds. This ensures continuous validation of the BSIC after the first successful identification, aligning with standard requirements for maintaining verified status over time.