RIS Beam Configuration via Pre-Configured Codebooks
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Solution Overview
Problem
Existing reconfigurable intelligent surface (RIS) technologies face challenges in efficiently configuring beams to cover wider shadowed areas and enhance communication performance, particularly in millimeter-wave communication systems where path loss and blockage are significant.
Innovation Solution
The method involves generating installation information for both the base station and the RIS, determining shadowed areas covered by transmission and reflection beams, and configuring a codebook with specific phase shift values to optimize beamforming. This approach allows for the selection of appropriate transmission and reflection beams to cover shadowed areas effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a codebook with specific phase shift values is used for RIS beam configuration, then beamforming accuracy is improved and shadowed area coverage is enhanced, but device complexity and configuration overhead increase
Solution Approach 1:
The codebook with specific phase shift values is pre-configured and stored in the RIS device before actual communication operations. This preliminary preparation allows the RIS to quickly select appropriate beams during operation without performing complex real-time calculations, thereby improving beamforming accuracy while managing configuration complexity through advance preparation
Solution Approach 2:
The patent employs discrete phase shift values from a pre-designed codebook instead of continuous phase adjustments. By changing the parameter space from continuous to discrete values, the system achieves sufficient beamforming accuracy while reducing the computational complexity and configuration overhead associated with managing continuous parameters
2Length of stationary object
If multiple transmission and reflection beams are configured to cover wider shadowed areas, then coverage distance is improved, but system complexity and beam management difficulty increase
Solution Approach 1:
The patent divides the coverage area into multiple shadowed regions and configures specific transmission and reflection beams for each region. By segmenting the overall coverage task into discrete beam pairs targeting specific shadowed areas, the system extends coverage distance while making beam management more systematic and tractable through region-based organization
Solution Approach 2:
The RIS device is configured with a universal codebook that contains phase shift values for multiple beam configurations. This single multi-functional codebook structure enables the RIS to serve multiple shadowed areas with different beam pairs, achieving extended coverage while avoiding the complexity of managing separate configuration systems for each region
3Measurement precision
If installation information and mapping tables are collected and processed, then shadowed area identification is improved, but information processing overhead and base station complexity increase
Solution Approach 1:
Installation information of the base station and RIS, including location coordinates and beam parameters, is collected and processed in advance to pre-generate mapping tables. This preliminary processing identifies shadowed areas and creates beam-to-region mappings before actual communication operations, improving identification accuracy while reducing real-time information processing overhead during data transmission
Solution Approach 2:
Instead of processing raw installation information and beam parameters in real-time, the patent creates simplified mapping tables that copy and represent the essential relationships between beams and shadowed areas. These compact mapping tables serve as simplified representations that maintain identification accuracy while significantly reducing the information processing overhead during operational phases
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This solution enhances the accuracy of RIS reflection beamforming, improves coverage distance, and allows the RIS to cover wider shadowed areas, thereby enhancing communication performance and reducing communication disruptions.
Implementation Method 1
determining at least one shadowed area covered by the at least one transmission beam and the at least one reflection beam
Data Source
AI summary
The present disclosure relates to a beam configuration technique for a reconfigurable intelligent surface. A method of a base station may comprise: generating first installation information of the base station including information on at least one transmission beam; requesting second installation information of an RIS from an RIS controller, the RIS being located nearby the base station; receiving, from the RIS controller, the second installation information including information on at least one reflection beam of the RIS; and determining at least one shadowed area covered by the at least one transmission beam and the at least one reflection beam based on the first installation information and the second installation information.