RIS Sensing Compensation for Frequency-Dependent Reflection Errors
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Solution Overview
Problem
The frequency-based characteristics of amplitude and phase reflection coefficients in reconfigurable intelligent surfaces (RIS) can disturb propagation delay and reduce estimation accuracy in wireless communication systems, particularly affecting target object distance estimation.
Innovation Solution
Wireless devices estimate frequency-based characteristics for each sensing signal resource based on incident and reflection beam direction angles, and adjust sensing operations using frequency-domain compensation factors to improve accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If frequency-based characteristics of RIS reflection coefficients are considered, then sensing accuracy is improved, but system complexity increases due to the need for frequency-domain compensation
Solution Approach 1:
The patent applies preliminary action by pre-calculating and indicating frequency-domain compensation factors to the wireless device before sensing operations. The network node determines these compensation factors based on RIS configuration and beam direction angles, then provides them to the wireless device in advance, allowing the device to apply corrections during sensing without real-time computational complexity.
Solution Approach 2:
The patent uses an intermediary approach by introducing frequency-domain compensation factors as a mediating element between the RIS reflection characteristics and the sensing measurements. These compensation factors act as correction parameters that bridge the gap between the frequency-dependent RIS behavior and the distance estimation process, enabling accurate sensing without directly modeling complex frequency responses.
2Measurement precision
If frequency-domain compensation factors are applied for each sensing signal resource, then estimation precision is improved, but processing overhead increases
Solution Approach 1:
The patent applies local quality by providing frequency-domain compensation factors specific to each sensing signal resource and beam direction angle. Instead of using a single global compensation factor, the system tailors compensation parameters to local conditions (specific resources and directions), improving estimation precision for each individual sensing operation while maintaining manageable processing requirements through selective application.
Data Source
AI summary
A first network node may be configured to transmit a configuration of a set of resources for at least one sensing signal. Each of the set of resources is associated with at least one of an incident beam direction angle of a wireless device or a reflection beam direction angle of the wireless device. The wireless device may be configured to receive the configuration of the set of resources for the at least one sensing signal. The wireless device may be configured to transmit an indication of at least one frequency-domain compensation factor for each of the set of resources based on the configuration. The first network node may be configured to transmit the at least one sensing signal based on the configuration of the set of resources. The wireless device may be configured to receive and forward the at least one sensing signal based on the set of resources.