RIS Channel Measurement for Reliable Wireless Signal Reception
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Solution Overview
Problem
Existing wireless communication systems face challenges in managing large communication capacities, reliability, and latency, particularly in environments requiring enhanced mobile broadband and massive machine type communications, with limited effectiveness in controlling radio channel environments.
Innovation Solution
The implementation of a reconfigurable intelligent surface (RIS) in wireless communication systems, utilizing artificial intelligence (AI) for channel measurement and beamforming, to enhance signal transmission and reception by controlling radio channel environments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If reconfigurable intelligent surface (RIS) is implemented to control radio channel environment, then communication capacity and reliability are improved, but device complexity and measurement difficulty increase
Solution Approach 1:
The channel measurement process is segmented into multiple measurement opportunities (MOs), where different reference signals are transmitted in different MOs. The terminal measures channels separately for each MO and combines results to estimate the overall channel, breaking down the complex RIS-controlled channel measurement into manageable segments.
Solution Approach 2:
The base station transmits reference signals through the RIS before actual data transmission. The terminal performs channel measurement and estimation in advance using these reference signals, obtaining channel state information that will be used for subsequent data reception and beamforming optimization.
2Measurement precision
If channel measurement is performed through RIS with multiple measurement opportunities, then measurement precision is improved, but loss of time increases
Solution Approach 1:
The channel measurement process continues across multiple measurement opportunities without interruption. The terminal continuously receives reference signals and accumulates channel information from each MO, maintaining the measurement process as an ongoing useful action rather than separate discrete measurements.
Solution Approach 2:
Channel measurement is performed in advance during dedicated measurement opportunities before actual data transmission begins. This preliminary measurement allows the system to prepare channel state information and beamforming parameters ahead of time, reducing latency during actual communication.
3Measurement precision
If reference signals are transmitted through RIS for channel estimation, then channel state information accuracy is improved, but use of energy increases
Solution Approach 1:
The base station transmits reference signals through the RIS with controlled power levels during specific measurement opportunities. Instead of continuous high-power transmission, the system uses partial action by transmitting reference signals only when needed for measurement, with power levels optimized for measurement accuracy rather than maximum data throughput.
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 enables effective channel measurement and signal transmission in smart radio environments, improving communication capacity, reliability, and reducing latency through AI-driven RIS control.
Implementation Method 1
at least one of the first reference signal and the second reference signal may be transmitted to the terminal through a reconfigurable intelligent surface (RIS)
Data Source
AI summary
The present disclosure may include, by a terminal in a wireless communication system, receiving a first reference signal transmitted from a base station, measuring a channel based on the first reference signal and generating first channel state information, receiving a second reference signal transmitted from the base station, measuring a channel based on the second reference signal and generating second channel state information, and receiving data through a first signal based on the first channel state information and the second channel state information. Herein, at least one of the first reference signal and the second reference signal may be transmitted to the terminal through a reconfigurable intelligent surface (RIS).