RIS Codebook Adaptation for UE Density

The patent applies dynamics by transitioning from a static codebook to a dynamic codebook that adapts to changing UE density conditions. The codebook is configured based on detected UE density in different geographical regions, allowing the RIS to adjust beam parameters dynamically. This resolves the contradiction by making the codebook versatile enough to handle varying UE densities while maintaining manageable complexity through automated detection and configuration processes.

The patent changes key parameters of the codebook including field of view (FOV), beam direction, and beam width based on UE density conditions. By modifying these parameters dynamically according to the detected UE density, the system achieves better coverage and reduced beam overhead without requiring an overly complex codebook structure, thus resolving the adaptability versus complexity contradiction.

The patent applies local quality by configuring the codebook differently for different geographical regions based on UE density. In regions with higher UE density, the codebook uses narrower beams with smaller FOV to concentrate resources, while in regions with lower UE density, wider beams with larger FOV are used. This localized adaptation achieves comprehensive coverage while minimizing beam overhead by avoiding unnecessary broad beams in high-density areas.

The patent uses partial action by selecting codebook configurations that are sufficient for the current UE density conditions rather than using a maximally comprehensive codebook. By detecting actual UE density and configuring the codebook accordingly, the system avoids excessive beam overhead while maintaining adequate coverage for the present conditions, resolving the contradiction between coverage and overhead.

The patent uses dynamics to switch between different codebook configurations based on detected UE density conditions. When high UE density is detected, the system adopts a codebook optimized for spectral efficiency with narrower beams. When low UE density is detected, the system transitions to a codebook configuration that provides wider coverage. This dynamic adaptation allows the system to achieve high spectral efficiency in dense areas while maintaining adequate coverage in sparse areas.

The patent changes codebook parameters such as beam width and FOV based on UE density conditions to balance spectral efficiency and coverage. By adjusting these parameters dynamically, the system optimizes for spectral efficiency in high-density regions while maintaining sufficient coverage in low-density regions, resolving the contradiction between productivity and coverage area.

The patent applies local quality by adjusting beam width locally according to UE density in different geographical regions. In high UE density areas, narrower beams are used to concentrate power and increase received power for nearby users. In low UE density areas, wider beams are used to maintain coverage area. This localized adaptation allows the system to achieve high received power where needed while preserving coverage where users are sparse.

The patent uses partial action by applying narrow beams only in high-density regions where increased received power is beneficial, rather than using narrow beams throughout the entire coverage area. This selective application of beam narrowing achieves the power improvement goal without excessively reducing overall coverage area, resolving the contradiction between received power and coverage area.