RIS Selection Using Partial Channel Measurements
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Solution Overview
Problem
Current technologies lack efficient methods for selecting reconfigurable intelligent surfaces (RIS) in wireless communication networks without detailed channel information or exhaustive measurements, leading to potential communication degradation.
Innovation Solution
A method for selecting RIS based on simple measurements of signals between a base station and user equipment (UE), utilizing slow-varying RIS information, such as capability and geometric data, to determine optimal RISs for communication, considering path delay differences and interference management.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If exhaustive channel measurements are performed for RIS selection, then measurement precision is improved, but measurement overhead and complexity increase
Solution Approach 1:
The patent applies partial action by performing only essential measurements rather than exhaustive channel measurements. The base station measures signals from multiple RISs and selects the best one based on these limited measurements, avoiding the need for complete channel state information while still achieving effective RIS selection and preventing communication degradation
Solution Approach 2:
The patent extracts only the necessary measurement information from the full channel state. Instead of measuring and processing complete channel matrices, the system extracts key metrics like signal strength or quality indicators from a subset of measurements, enabling RIS selection with reduced measurement overhead and complexity
2Reliability
If detailed channel information is collected for RIS selection, then reliability is improved, but loss of time and measurement overhead increase
Solution Approach 1:
The patent implements preliminary action by having the base station pre-measure and evaluate multiple RISs before communication degradation occurs. The base station proactively identifies and selects the optimal RIS based on current measurements, preparing the system in advance to prevent outages without requiring continuous exhaustive monitoring
Solution Approach 2:
The system performs partial measurements on a selected subset of RISs rather than continuously measuring all possible RISs. This approach maintains communication reliability by monitoring key candidates while significantly reducing the time and resources required for measurement
3Adaptability or versatility
If multiple RISs are selected and configured, then adaptability is improved, but device complexity increases
Solution Approach 1:
The patent applies segmentation by dividing the RIS selection process into distinct stages: measurement phase, evaluation phase, and configuration phase. The base station measures multiple RISs, evaluates them independently, and configures only the selected optimal RIS. This segmented approach enables flexible RIS selection while managing complexity through structured process separation
Data Source
AI summary
The techniques described herein can include solutions for selection of reconfigurable intelligent surfaces (RISs). RIS selection can be performed by a base station and/or a user equipment (UE). RIS selection can be directed to reducing signal degradation, addressing dynamic signal blocking, reducing outage probabilities, interference, and more. RIS selection can include selection of signaling resources, such as channels, bands, and sub-bands.