Multi-RIS Channel Estimation via Position-Based Reference Selection
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Solution Overview
Problem
Current RIS technologies are limited by the use of single RIS devices, which result in deteriorated signal quality and reduced frequency efficiency due to disconnection of direct and reflection paths, failing to meet data demands and enhance performance in communication systems.
Innovation Solution
Implementing a multi-RIS system where multiple RIS devices cooperatively control radio waves by forming reflection patterns of phase and amplitude, allowing the base station to estimate the position of user equipment (UE) using selected reference RIS devices and reduce the overhead of uplink pilot signals for channel estimation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single RIS device is used, then the device complexity is reduced, but the signal quality deteriorates and frequency efficiency is reduced due to disconnection of direct and reflection paths
Solution Approach 1:
The patent combines multiple RIS devices to work cooperatively, merging their reflection capabilities to provide multiple reflection paths alongside direct paths. This integration of multiple RIS units resolves the signal quality deterioration issue while maintaining manageable system complexity through coordinated control.
Solution Approach 2:
The patent segments the communication path into multiple independent components: direct paths and multiple reflection paths through different RIS devices. This segmentation allows each path to be independently controlled and optimized, improving overall signal reliability while enabling selective use of paths based on communication needs.
2Device complexity
If a single RIS device is used, then the system configuration is simplified, but frequency efficiency is reduced due to disconnection of direct and reflection paths
Solution Approach 1:
The patent merges direct transmission paths with multiple reflection paths through coordinated RIS devices, creating a hybrid communication system that utilizes all available paths simultaneously. This combination improves frequency efficiency by providing redundant and diverse transmission routes while maintaining systematic control through unified management.
Solution Approach 2:
The patent adds spatial dimensionality to the communication system by deploying multiple RIS devices at different locations, creating reflection paths from multiple spatial dimensions. This dimensional expansion provides additional communication routes that improve frequency efficiency while the systematic arrangement maintains configuration manageability.
3Productivity
If multiple RIS devices are deployed, then data transmission rate and reliability are enhanced, but the overhead of uplink pilot signals for channel estimation increases
Solution Approach 1:
The patent segments the channel estimation process by having different RIS devices report channel information independently to the base station. This segmentation allows parallel processing of channel data from multiple RIS units, reducing the overall overhead compared to sequential estimation methods while maintaining accurate multi-RIS channel characterization.
Solution Approach 2:
The patent introduces the base station as an intermediary that coordinates channel estimation across multiple RIS devices. The base station receives and processes channel information from multiple RIS units, managing the estimation overhead centrally while enabling high data transmission rates through the combined RIS system.
4Area of stationary object
If multiple RIS devices are deployed, then cell coverage and signal quality are improved, but the system complexity increases
Solution Approach 1:
The patent expands cell coverage by adding spatial dimensionality through multiple RIS devices positioned at different locations. Each RIS device covers a specific spatial zone, and their coordinated operation extends the overall coverage area while the modular deployment approach keeps system complexity manageable through standardized configuration.
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 data transmission rate, reliability, and cell coverage by combining direct and reflection paths, providing improved signal quality and frequency efficiency in wireless communication systems.
Implementation Method 1
RIS technology, a reflection pattern of reflecting elements (REs) included in the RIS device is formed as a combination of phase and/or amplitude, and the transmission beam of the base station incident on the RIS device may be reflected in a desired direction according to the reflection pattern
Data Source
AI summary
The present disclosure relates to a method and device for communication by a base station in a wireless communication system supporting multiple reconfigurable intelligent surface (RIS) devices. According to an embodiment A method for operating a base station, the method comprises selecting at least two reference reconfigurable intelligent surface (RIS) devices for estimating a position of a user equipment (UE) from among a plurality of RIS devices, estimating position information about the UE using the selected at least two reference RIS devices, receiving an uplink pilot signal of the UE through the selected at least two reference RIS devices; and estimating a multi-RIS channel for the plurality of RIS devices based on the uplink pilot signal of the UE and the estimated position information about the UE.