CSI Feedback Using Multi-Level Beam Selection

The beam set is segmented into multiple groups, where a first beam group is selected from a first set and a second beam group is selected from a second set. This segmentation allows the system to achieve finer CSI feedback precision by selecting beams from different groups independently, while keeping the feedback overhead manageable through structured selection processes.

The patent introduces a two-dimensional beam selection approach by dividing beams into first and second beam groups from different sets. Instead of selecting beams from a single one-dimensional list, the system operates in a two-dimensional space of beam groups, enabling finer precision without proportionally increasing the total number of beams.

The patent performs preliminary beam selection by first selecting a first beam group from a first set and a second beam group from a second set before final beam determination. This preliminary action organizes the complex selection process into manageable stages, reducing the overall computational complexity while achieving fine-grained CSI feedback precision.