HARQ-ACK Feedback Segmentation for NR-U Overhead Reduction

The patent segments the HARQ-ACK feedback into two parts: a first part indicating whether at least one CBG was received correctly, and a second part providing detailed CBG-level feedback only when needed. This segmentation allows the system to maintain reliability through detailed feedback when necessary while reducing overhead by using simpler feedback when all CBGs are received correctly, resolving the contradiction between feedback reliability and overhead reduction.

The patent implements partial feedback by providing detailed CBG-level feedback information only when necessary (when at least one CBG was not received correctly), rather than always providing full codebook feedback. This partial action approach reduces feedback overhead in successful transmissions while maintaining reliability when errors occur, addressing the contradiction between comprehensive feedback and overhead reduction.

The patent segments the feedback structure into a first feedback part (indicating at least one CBG received correctly) and a second feedback part (providing detailed CBG feedback). This segmentation simplifies the codebook design by using a two-stage feedback mechanism rather than requiring a completely new complex codebook structure, while still achieving CBG-based precision when needed.

The patent makes the feedback structure universal by using a unified feedback format that can handle both successful transmissions (first part only) and error cases (first and second parts). This multi-functional feedback structure reduces device complexity by avoiding separate codebook designs for different scenarios while maintaining the precision benefits of CBG-based feedback when required.

The patent applies partial feedback by transmitting detailed CBG-level feedback information only when necessary (when at least one CBG was not received correctly). For successful transmissions, only the first feedback part is sent. This partial action approach reduces the average feedback amount while maintaining high precision when errors occur, resolving the contradiction between feedback precision and feedback quantity.

The patent implements dynamic feedback adaptation where the feedback structure changes based on transmission conditions. The feedback amount and detail level are dynamically adjusted: full detailed feedback when errors occur, simplified feedback when transmissions are successful. This dynamic approach maintains measurement precision when needed while significantly reducing average feedback overhead, addressing the contradiction between precision and quantity.