Question: What is implied if a User Equipment (UE) indicates support for aperiodic Channel State Information (CSI) reporting for Short Transmission Time Interval (STTI) in its radio access capabilities?
Option 1: The UE only supports aperiodic CSI reporting for normal TTI.
Option 2: The UE does not support any legacy CSI reporting capabilities.
Option 3: The UE's support is limited to periodic CSI reporting for short TTI.
Option 4: The UE also supports legacy aperiodic CSI capabilities for short TTI.
Explanation: If a UE indicates support for aperiodic CSI reporting for Short Transmission Time Interval (STTI), it implies the UE also retains compatibility with and thus supports the legacy aperiodic CSI capabilities designed for short TTI, ensuring backward compatibility and flexibility in the UE's operation within the network.