Multi-Point RIS Relay Control Using Shared Reflection Elements
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Solution Overview
Problem
Conventional relay control systems using reconfigurable intelligent surfaces (RIS) face increased network costs and installation challenges when multiple transmission points are involved, as each transmission point requires a separate RIS, making it difficult to secure installation places efficiently.
Innovation Solution
A relay control system employing a single relay apparatus with multiple reflection elements that can apply independent phase shifts, utilizing a communication unit to receive transmission point information, an element allocation unit to determine reflection element allocation, and a phase control unit to generate beams directed to reception points, thereby establishing multiple communication links.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a separate RIS is installed for each transmission point, then communication coverage is improved, but network cost increases and installation places become difficult to secure
Solution Approach 1:
The patent merges multiple RIS functions into a single relay apparatus that can simultaneously serve multiple transmission points. The relay apparatus includes multiple reflection element groups, each corresponding to a different transmission point, allowing one device to perform the function of multiple separate RIS installations, thereby reducing network cost and installation complexity while maintaining communication coverage
Solution Approach 2:
The relay apparatus is designed with multi-functionality to handle communications from multiple transmission points simultaneously. It includes multiple reflection element groups that can independently control reflections for different transmission points, making a single apparatus universal enough to replace multiple dedicated RIS installations
2Reliability
If multiple reflection elements are allocated to each transmission point, then communication quality is improved, but the number of required reflection elements increases
Solution Approach 1:
The patent combines reflection elements that would otherwise be dedicated to individual transmission points into shared pools within a single relay apparatus. Multiple transmission points share access to the same reflection elements through time-division or spatial-division multiplexing, reducing the total quantity of reflection elements needed while maintaining communication quality through coordinated control
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 reduces network costs and facilitates easy installation by allowing a single relay apparatus to handle multiple transmission and reception points, ensuring efficient communication coverage without the need for multiple RIS installations.
Implementation Method 1
The phase control unit 24 performs a process for controlling a phase to be applied to the reflection wave based on the control information
Implementation Method 2
The reflection unit 26 is provided with a large number of reflection elements disposed two-dimensionally. Each of the reflection elements can reflect an incoming wave incident in a high frequency band after controlling a phase
Implementation Method 3
When appropriate phase control is performed in each of the reflection elements, the communication wave reflected by the reflection unit 26 becomes a beam directed in a specific direction
Data Source
AI summary
A relay apparatus includes a plurality of reflection elements that applies independent phase shifts to an incoming wave, a communication circuitry that receives transmission point information from one or more transmission points, an element allocation circuitry, and a phase control circuitry. The element allocation circuitry determines the number of communication links to be established via the relay apparatus based on the transmission point information, determines the number of reflection elements to be allocated to each of the communication links, and determines a reflection element to be allocated to each of the communication links according to the number of the reflection elements. The phase control circuitry determines the phase weights so that a beam directed to a reception point being a communication destination of each communication link is generated by a reflection wave generated by each reflection element allocated to each of the communication links.