Question: After a handover resulting in a change of Primary Cell (PCell) in RRC_CONNECTED, what action should a Non-BL (Non-Bluetooth Low Energy) UE (not in Coverage Enhancement) take regarding access barring checks if SystemInformationBlockType25 is broadcasted in the target cell?
Option 1: Immediately perform access barring checks using previously acquired SystemInformationBlockType25.
Option 2: Defer access barring checks until valid UAC information from SystemInformationBlockType25 of the target cell is obtained, but only if the UE was previously in idle mode.
Option 3: Defer access barring checks until valid UAC information (from SystemInformationBlockType25) from the target cell is obtained, as the handover changed the PCell.
Option 4: Assume SystemInformationBlockType25 is not broadcast in the target cell and initiate a new RRC connection setup.
Explanation: According to the Unified Access Control procedure for UEs in RRC_CONNECTED (except for BL UEs or those in Coverage Enhancement), after a handover that changes the PCell, the UE must wait to obtain valid UAC information from SystemInformationBlockType25 of the target cell before proceeding with access barring checks. This ensures the UE adheres to the new cell's access control policies.