CSI Reporting in Mixed Duplex Carrier Aggregation

The patent segments CSI reporting by dividing it into two distinct types: Type 1 CSI reporting for FDD cells and Type 2 CSI reporting for TDD cells. This segmentation allows each type to be handled according to its specific duplex mode requirements, preventing collisions between CSI reports from different duplex modes while maintaining high data transmission capacity through Carrier Aggregation.

The patent merges the CSI reporting timing configurations of FDD and TDD cells by aligning their reporting periods to a common time base. Specifically, it configures the CSI reporting period for TDD cells to be an integer multiple of the FDD cell's reporting period, ensuring that CSI reports from both duplex modes are transmitted at synchronized intervals. This merging approach eliminates timing conflicts and prevents report drops while preserving the flexibility needed for different traffic conditions.

The patent applies local quality by allowing different duplex modes (FDD or TDD) to be configured for different Component Carriers based on their specific service requirements and channel conditions. Each cell can independently select the most appropriate duplex mode for its local characteristics, while the system maintains unified CSI reporting mechanisms. This approach reduces overall system complexity by providing localized optimization without requiring complex global coordination.