RIS Precoding Type Indication for Blockage Recovery
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Solution Overview
Problem
Current wireless communication technologies, such as LTE and NR, face challenges in improving spectral efficiency and adapting to increasing demand for mobile broadband access, particularly in scenarios with communication blockages between base stations and user equipment.
Innovation Solution
The implementation of a reconfigurable intelligent surface (RIS) that uses precoding techniques, including codebook-based and non-codebook-based methods, to re-radiate signals and overcome obstacles, enabling efficient communication by adjusting precoding types and weights for RIS elements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If traditional wireless communication systems (LTE, NR) are used to provide mobile broadband access, then basic communication services are delivered, but spectral efficiency is insufficient and demand for mobile broadband access cannot be adequately met
Solution Approach 1:
The patent introduces a reconfigurable intelligent surface (RIS) as an intermediary device between the base station and user equipment. The RIS reflects and re-radiates wireless signals to create alternative communication paths, enabling communication to continue when direct paths are blocked. This mediator approach directly addresses the reliability issue under blockage conditions while maintaining spectral efficiency through intelligent signal routing.
Solution Approach 2:
The RIS is configured with multiple communication elements that can dynamically adjust their precoding weights and phases in real-time. This dynamic reconfiguration allows the system to adapt to changing communication conditions, optimize signal paths, and maintain high spectral efficiency while overcoming blockages. The dynamic nature of the RIS enables continuous optimization of communication quality.
2Productivity
If precoding techniques are applied to improve spectral efficiency, then communication efficiency is enhanced, but system complexity increases due to the need to manage multiple precoding types and configurations
Solution Approach 1:
The patent segments the precoding function into distinct types (codebook-based precoding and non-codebook-based precoding), each handled by dedicated components. The codebook-based approach uses pre-configured weight sets stored in memory, while the non-codebook approach uses dynamically calculated weights. This segmentation allows the system to manage complexity by selecting appropriate precoding types for different scenarios rather than implementing all possibilities simultaneously.
Solution Approach 2:
The system manages precoding complexity by changing operational parameters rather than structural complexity. The base station and RIS dynamically adjust parameters such as the selected precoding type, codebook index, or weight configuration based on channel conditions. This parameter-based adaptation allows efficient communication while keeping the control logic manageable through standardized switching between precoding modes.
Data Source
AI summary
Aspects of the present disclosure provide apparatus, methods, processing systems, and computer readable mediums for indicating or switching among or between different precoding types for one or more communication elements. The one or more communication elements may be antennas of a wireless communication device (e.g., a UE or a BS) or elements of a reconfigurable intelligent surface (RIS). Techniques herein relate to indicating to one or more devices which precoding type to use for precoding one or more communication elements. For example, the techniques herein may be used for precoding communication elements of any suitable wireless communication device, such as antennas of a UE or BS, or RIS elements of a RIS.