RIS Codebook Updates for Intelligent Surface Deformation Mitigation
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Solution Overview
Problem
Reconfigurable intelligent surfaces (RIS) deployed in wireless communications systems are susceptible to deformation due to manufacturing and environmental factors, leading to degraded performance and limiting their potential to enhance wireless communication quality.
Innovation Solution
Techniques for RIS deformation mitigation involve estimating the deformation of RIS elements using observation information, sensor data, or image analysis to update precoding weights in a codebook, compensating for the deformation and maintaining optimal RIS performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If RIS elements are deployed to enhance wireless communication coverage and capacity, then communication performance is improved, but RIS elements are susceptible to deformation due to manufacturing and environmental factors
Solution Approach 1:
The patent applies preliminary action by estimating RIS element deformations before they fully impact communication performance. The system proactively identifies deformation characteristics through observation information and deformation databases, then applies codebook pattern updates in advance to compensate for these deformations, preventing performance degradation rather than reacting after degradation occurs.
Solution Approach 2:
The patent implements feedback mechanisms where the system continuously monitors RIS element performance through observation information (signal strength, phase, amplitude) and compares it against expected values from deformation databases. This feedback loop enables real-time detection of deformation and automatic adjustment of codebook patterns to maintain optimal RIS performance despite manufacturing variations and environmental factors.
2Productivity
If RIS elements are configured with precise codebook patterns, then communication quality is optimized, but any deformation in RIS elements degrades the optimized performance
Solution Approach 1:
The patent applies dynamics by making the codebook patterns adaptive rather than static. The system dynamically adjusts codebook patterns based on real-time deformation estimates, transitioning from fixed precise configurations to flexible adaptive configurations that can accommodate RIS element deformations while maintaining optimal communication performance.
Solution Approach 2:
The patent changes the parameters of the codebook patterns to compensate for RIS element deformations. By modifying the codebook patterns (changing phase, amplitude, or other relevant parameters) based on deformation estimates, the system maintains optimal communication capacity even when RIS elements are deformed, effectively decoupling communication performance from physical precision.
3Reliability
If the system continuously monitors and adjusts for RIS deformation, then performance is maintained, but system complexity increases
Solution Approach 1:
The patent uses copying by creating a deformation database that stores observation information and deformation characteristics as reference copies. Instead of complex real-time calculation, the system queries pre-stored deformation patterns and matching observation information from the database, simplifying the mitigation process while maintaining accurate performance monitoring and adjustment.
Data Source
AI summary
Certain aspects of the present disclosure provide techniques for reconfigurable intelligent surface (RIS) deformation mitigation. A method generally includes configuring a plurality of nodes with a plurality of resources for communicating a plurality of signals with the apparatus or a network entity via a RIS comprising a plurality of RIS elements; obtaining observation information associated with the plurality of signals communicated between the plurality of nodes and the apparatus or the network entity via the RIS; determining an RIS element deformation for at least one RIS element based on the observation information and a deformation database associated with the RIS, the deformation database providing a mapping between a plurality of RIS element deformations and one or more observations expected for each of the plurality of RIS element deformations; and sending a codebook pattern update to compensate for the RIS element deformation for the at least one RIS element.