Reconfigurable Surface Device Near-Field Beamforming Adaptation
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Solution Overview
Problem
Current Reconfigurable Intelligent Surface (RIS) technologies face challenges in achieving effective near-field performance due to inadequate access to information, significant loss of signal strength, and poor robustness, making it difficult to provide high-rate outdoor coverage in wireless communication systems.
Innovation Solution
A base station determines configuration information based on user equipment location and transmits it to a reconfigurable surface device, allowing the device to adaptively adjust its codebook and array element state for improved beamforming, reducing near-field performance loss and enhancing signal gain through user-location-based adaptive beamforming.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If a large-area RIS panel is used to achieve high-rate outdoor coverage, then coverage capability is improved, but users are located in the near-field range where traditional beamforming performs poorly
Solution Approach 1:
The patent implements dynamic codebook selection based on user location. The base station determines whether a user is in near-field or far-field range and configures appropriate codebooks accordingly. This dynamic adaptation allows the system to maintain reliable beamforming performance across different user distances while using large-area RIS panels for extended coverage.
Solution Approach 2:
The patent changes the codebook parameter based on user location. Different codebooks are configured for near-field and far-field users, optimizing the beamforming characteristics for each scenario. This parameter change resolves the contradiction by allowing the system to adapt its beamforming approach to match the user's distance from the RIS panel.
2Speed
If traditional beamforming is used for RIS transmission, then far-field signal transmission is achieved, but near-field performance is poor
Solution Approach 1:
The system dynamically switches between different codebook configurations based on user location. For near-field users, a specialized near-field codebook is applied that accounts for spherical wave propagation characteristics. For far-field users, traditional far-field codebooks are used. This dynamic adaptation enables reliable beamforming for both near-field and far-field transmissions.
Solution Approach 2:
The patent applies different codebook qualities locally based on user position. Near-field users receive beamforming optimized for close-proximity characteristics (spherical waves, phase curvature), while far-field users receive beamforming optimized for plane-wave characteristics. This local quality differentiation resolves the contradiction between near-field and far-field performance.
3Device complexity
If RIS parameters are statically configured, then device complexity is reduced, but adaptability to different user locations is poor
Solution Approach 1:
The system implements feedback mechanisms where the base station receives user location information and determines the appropriate codebook configuration. The base station then transmits this configuration information to the RIS panel. This feedback loop enables the RIS to adapt its parameters dynamically without requiring complex local decision-making at the RIS itself, maintaining relatively simple device architecture while achieving high adaptability.
Solution Approach 2:
The base station acts as an intermediary that processes user location information and determines the optimal RIS codebook configuration. This intermediary role allows the system to achieve adaptive beamforming without requiring complex intelligence at the RIS panel, distributing the computational complexity to the base station which has greater processing capabilities.
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
This approach enhances signal gain and reduces near-field performance loss by dynamically adjusting the RIS parameters based on user location, improving the overall coverage and capacity of wireless communication systems.
Implementation Method 1
RIS can collect signals sent by a signal-transmitting side and transmit them to a signal-receiving side by beamforming
Data Source
AI summary
The present disclosure provides a base station. The base station includes: a control unit configured to determine configuration information regarding a reconfigurable surface device based on location of a user equipment; and a transmitting unit configured to send the configuration information to the reconfigurable surface device so that the reconfigurable surface device determines a codebook used by the reconfigurable surface device based on the configuration information.