RIS Beam Sensing With Backtracking Reflection Coefficients
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Solution Overview
Problem
Existing wireless communication systems face challenges in accurately determining the position of reconfigurable intelligent surfaces (RIS) for enhanced sensing and communication capabilities, particularly in scenarios with limited coverage and non-line-of-sight conditions, due to the lack of precise positioning reference points.
Innovation Solution
Employing backtracking reflection coefficient sweeping to transmit and measure reference signal beams from a RIS, allowing for the determination of a selected beam direction and reflection coefficient to accurately position the RIS.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional wireless communication systems are used without RIS, then the system structure is simple, but the coverage is limited and positioning accuracy is insufficient
Solution Approach 1:
The patent introduces RIS as an intermediary element between the base station and user equipment. The RIS reflects and redirects wireless signals to extend coverage and provide positioning reference points. By using RIS as a mediator, the system achieves improved positioning accuracy and coverage without requiring fundamental changes to the core communication architecture, thus resolving the contradiction between positioning precision and system complexity.
Solution Approach 2:
The patent employs preliminary actions through reference signal beams transmitted to the RIS before actual communication. The base station transmits reference signals to the RIS, which then reflects these signals back to establish positioning reference points in advance. This preliminary signal transmission enables accurate RIS positioning to be determined before data communication begins, improving positioning accuracy while maintaining system simplicity.
2Area of stationary object
If RIS is introduced to extend coverage, then coverage distance is extended and coverage holes are eliminated, but the complexity of signal processing increases
Solution Approach 1:
The patent segments the signal processing task into distinct phases: reference signal transmission, reflection coefficient measurement, and beam direction determination. By dividing the complex RIS positioning and coverage extension process into manageable segments, the system achieves extended coverage through systematic signal reflection while keeping the processing complexity organized and controllable through structured algorithms.
Solution Approach 2:
The patent utilizes parameter changes by measuring reflection coefficients and adjusting beam directions based on signal strength measurements. The system changes parameters such as reflection coefficients and beam angles to optimize signal coverage and positioning accuracy. This parameter adjustment approach enables coverage extension while managing processing complexity through efficient algorithmic optimization rather than brute-force methods.
3Measurement precision
If backtracking reflection coefficient sweeping is used, then RIS positioning accuracy is improved, but the time required for measurement increases
Solution Approach 1:
The patent implements continuous measurement and optimization through backtracking reflection coefficient sweeping. The system continuously measures signal strengths for different reflection coefficients and beam directions, using the results to refine positioning accuracy. This continuous action ensures that the most accurate positioning is achieved efficiently by leveraging all available measurement data rather than requiring exhaustive searches, thus balancing measurement precision with time efficiency.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enhances the accuracy of RIS positioning, extending coverage distance and eliminating coverage holes by using RIS beamforming, thereby improving the overall efficiency of wireless communication networks.
Implementation Method 1
receiving, from the RIS, a plurality of reflection reference signal beams in the plurality of directions based on a plurality of backtracking reflection coefficients
Data Source
AI summary
Disclosed are systems, apparatuses, processes, and computer-readable media for wireless communications. For example, an example of a process includes transmitting, to a reconfigurable intelligent surface (RIS), a plurality of reference signal beams in a plurality of directions. The process may further include receiving, from the RIS, a plurality of reflection reference signal beams in the plurality of directions based on a plurality of backtracking reflection coefficients. The process may include measuring a signal strength of each reflection reference signal beam in each direction of the plurality of directions for each backtracking reflection coefficient of the plurality of backtracking reflection coefficients. The process may further include determining, basing on measuring the signal strength, a selected beam direction from the plurality of directions and a selected backtracking reflection coefficient of the plurality of backtracking reflection coefficients.