Question: Under what condition(s), as specified for FDD, will the DRNC (Drift RNC) initiate the Radio Link Failure procedure during a radio link reconfiguration in UTRAN?
Option 1: If the new transport bearer is available at the requested configuration switching point.
Option 2: If Fast Reconfiguration Mode IE is included in the RADIO LINK RECONFIGURATION COMMIT message but was not permitted by the DRNC.
Option 3: If either (a) the Transmission Gap Pattern Sequence for affected HS-DSCH Serving Cells is partially activated, or (b) an Activation Delay IE is present without a supported Fast TTI switching Mode Requested Synchronized setting.
Option 4: When the RADIO LINK RECONFIGURATION COMMIT message does not contain any IEs related to Fast Reconfiguration.
Explanation: Condition (a) refers to inconsistent Transmission Gap Pattern Sequence activation across serving cells. Condition (b) involves an Activation Delay IE without necessary support for synchronized Fast TTI switching, indicating a capability mismatch. Both conditions necessitate initiating the Radio Link Failure procedure to prevent operational inconsistencies during UTRAN radio link reconfigurations.