Programmable Smart Surface Bus Control for Scalable RIS Beamforming
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Solution Overview
Problem
Existing Reconfigurable Intelligent Surfaces (RIS) technologies face limitations such as limited beamforming precision due to 1 or 2 bit phase shifters, unnecessary active antenna elements leading to high overhead, fixed number and spacing of active antenna elements, and poor scalability due to direct connections between unit cells and the control element.
Innovation Solution
A reflective device with a control element and a reflective surface comprising multiple reflective elements, each with an antenna and a phase shifting arrangement, connected via a cell selection bus system for joint control, allowing for adjustable phase shifts and dynamic adaptation of active antenna elements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If phase shifters with 1 or 2 bit are used for beamforming steering, then the device complexity is reduced, but the beamforming precision is significantly limited
Solution Approach 1:
The patent implements dynamic reconfiguration of the RIS by allowing unit cells to be selectively activated or deactivated based on current communication requirements. This dynamic capability enables the system to adapt beamforming precision to actual needs without permanently complex hardware, resolving the contradiction between fixed complexity and variable precision requirements
Solution Approach 2:
The system changes the operational parameters of reflective elements by controlling their impedance states through the bus system. By dynamically adjusting which unit cells are active and their phase states, the system achieves variable beamforming precision without requiring permanently complex phase shifters at each element
2Area of stationary object
If all reflective elements are kept active, then the coverage area is maximized, but the overhead in RIS configuration increases significantly
Solution Approach 1:
The patent enables dynamic activation and deactivation of unit cells through the control bus system. This allows the RIS to adaptively adjust the number of active reflective elements based on current communication needs, reducing configuration overhead when full coverage is not required while maintaining the capability for full coverage when needed
Solution Approach 2:
The system implements partial activation of reflective elements by selectively enabling only the necessary unit cells for current operational requirements. This partial action approach reduces configuration overhead and power consumption while maintaining sufficient coverage area through intelligent selection of active elements
3Device complexity
If the number of active antenna elements is fixed by design, then the device complexity is reduced, but the adaptability to different communication scenarios is limited
Solution Approach 1:
The patent implements dynamic reconfiguration of the number of active antenna elements through the control bus system. Unit cells can be selectively activated or deactivated to match different communication scenarios, providing adaptability without requiring physically reconfigurable antenna structures or complex permanent configurations
Solution Approach 2:
The RIS is segmented into independently controllable unit cells that can be selectively activated. This segmentation allows the system to adapt the number of active antenna elements by controlling individual cells through the bus system, achieving versatility without complex integrated configurations
4Speed
If direct connections are made between antenna elements and control unit, then the control speed is improved, but the scalability is limited due to limited free lines
Solution Approach 1:
The patent introduces a bus system as an intermediary between the control unit and unit cells. This bus-based architecture allows multiple unit cells to be controlled through shared communication lines, enabling scalability to thousands of elements while maintaining control speed through efficient bus arbitration and addressing mechanisms
5Device complexity
If a RIS board is designed as a standalone device, then the device complexity is reduced, but the ease of cooperation with additional boards is limited
Solution Approach 1:
The patent implements a universal bus interface that allows RIS boards to cooperate with each other and with additional functionality boards. The same bus system used for controlling unit cells can also facilitate inter-board communication and coordination, enabling modular expansion and cooperative operations without increasing fundamental system complexity
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
The solution achieves high scalability and reconfiguration speed in communication infrastructure, enabling precise beamforming and dynamic adjustment of active antenna elements to enhance communication efficiency and reduce interference.
Implementation Method 1
Each reflective element comprises an antenna element and a phase shifting arrangement and is under control of the control element so as to reflect a radio-frequency (RF) signal incident on the reflective surface with an adjustable phase shift
Implementation Method 2
reflective device including a control element, and a reflective surface including a plurality of reflective elements... to reflect a radio-frequency (RF) signal incident on the reflective surface
Data Source
AI summary
A reflective device includes a control element, and a reflective surface with a plurality of reflective elements. Each reflective element of the plurality of reflective elements includes an antenna element and a phase shifting arrangement and is under control of the control element so as to reflect a radio-frequency (RF) signal incident on the reflective surface with an adjustable phase shift. The plurality of reflective elements are connected to the control element via a cell selection bus system that interconnects the plurality of reflective elements.