CSI Feedback via Uplink Grant Bit Mapping in Carrier Aggregation

The patent segments the channel status information reporting by dividing serving cells into first serving cell set and second serving cell set. The CSI request field is segmented into multiple bits where each bit corresponds to a specific serving cell or cell set. This segmentation allows the UE to report CSI for specific cells independently, reducing the complexity of managing CSI for multiple carriers while maintaining high transmission capacity.

The patent implements partial action by allowing the CSI request field to selectively trigger CSI reporting for specific serving cells or cell sets based on the bit pattern. Not all serving cells need to report CSI simultaneously - only those indicated by the set bits in the CSI request field. This reduces the average overhead compared to requesting CSI from all cells continuously, while maintaining the precision to target specific cells when needed.

The patent introduces dynamic CSI reporting where the UE transmits aperiodic CSI for specific serving cells based on the dynamic content of the CSI request field received in uplink grants. The system adapts which cells report CSI at each time instant rather than using a fixed reporting pattern. This dynamic approach ensures high accuracy feedback when needed while reducing resource consumption during periods when fewer cells require reporting.