RIS Codebook Beamforming With Dynamic Precoder Selection
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Solution Overview
Problem
Current wireless communication systems face challenges in efficiently redirecting signals using reconfigurable surfaces, particularly in extending wireless coverage and managing signal throughput, as they lack effective methods for dynamic codebook-based beamforming and precoder management.
Innovation Solution
The implementation of codebook-based beamforming techniques for reconfigurable surfaces, which involve generating and adjusting codebooks with specific weights for antenna elements, allowing for the use of multiple precoder types and polarization support, and transmitting capability signaling to base stations for optimal channel measurements and communication link training.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If reconfigurable surfaces are used to redirect signals, then wireless coverage is extended, but signal redirection efficiency is insufficient without effective codebook-based beamforming
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting precoder weights and codebook configurations for reconfigurable surface elements. The base station transmits capability signaling indicating supported precoder types, and the reconfigurable surface adjusts its signal redirection parameters based on channel measurements and codebook selections, thereby optimizing signal redirection efficiency while extending wireless coverage.
2Adaptability or versatility
If multiple precoder types are supported for codebook generation, then beamforming flexibility is improved, but device complexity increases
Solution Approach 1:
The patent implements dynamics by enabling the reconfigurable surface to dynamically select and switch between multiple precoder types based on channel conditions and capability signaling. The system transitions from static single-precoder configurations to dynamic multi-precoder selection, allowing the reconfigurable surface to adapt its beamforming approach while the base station manages the complexity through capability indication and codebook configuration.
3Reliability
If capability signaling is transmitted for precoder types, then communication link optimization is improved, but signaling overhead increases
Solution Approach 1:
The patent extracts only the essential capability information from the full precoder configuration set and transmits it through capability signaling. Instead of transmitting complete codebook configurations, the base station extracts and signals supported precoder types, and the reconfigurable surface extracts the necessary codebook index from the signaled capabilities, thereby reducing signaling overhead while maintaining communication link optimization.
Data Source
AI summary
Methods, systems, and devices for codebook-based beamforming considerations for reconfigurable intelligent surfaces (RISs) are described. For example, an RIS may transmit, to a first wireless device, an indication of a capability of using different types of precoders for generating a codebook for the RIS for redirecting wireless signals. The codebook may include codewords associated with weights for respective elements of the RIS. In some cases, the RIS may receive, from the first wireless device, a type of precoder for generating the codebook. As such, the RIS may adjust one or more elements using the weights for the respective elements based on receiving the indication and in accordance with training a communication link between the first wireless device and a second wireless device via the plurality of elements. In some examples, the RIS may receive, from the first wireless device, an index corresponding to a codeword.