RIS Channel State Information Measurement via Direct and Reflected Paths
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Solution Overview
Problem
Existing wireless communication systems face challenges in effectively utilizing reconfigurable intelligent surfaces (RIS) for channel state information (CSI) acquisition, as current methods do not adequately address the need for precise measurement and reporting of CSI using RIS.
Innovation Solution
A wireless transmit/receive unit (WTRU) is configured to perform measurements using both direct and reflected transmission paths involving a reconfigurable intelligent surface, allowing for separate and time-division multiplexed reference signals, and reports these measurements to a network device, which can then determine RIS updates based on the received information.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If separate reference signals are used for direct and reflected transmission paths, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The patent segments the measurement process by configuring separate reference signals (first reference signal for direct path, second reference signal for reflected path) for different transmission paths. This allows independent measurement of each path's channel state, improving measurement precision while managing complexity through structured resource allocation.
Solution Approach 2:
The patent introduces time-division multiplexing as an additional dimension to separate the measurement of direct and reflected paths. By allocating different time resources (first measurement resource, second measurement resource) to different paths, the system achieves precise measurements without overwhelming complexity in resource management.
2Measurement precision
If time-division multiplexing is used for reference signals, then measurement accuracy is improved, but loss of time increases
Solution Approach 1:
The patent implements periodic reference signal transmissions with different patterns for direct and reflected paths. The network device periodically sends first reference signals and second reference signals in a time-multiplexed manner, allowing the WTRU to perform measurements at specific periodic intervals, thus achieving accurate measurements while minimizing time loss through efficient scheduling.
3Loss of information
If detailed measurement reports are transmitted, then information completeness is improved, but loss of information is reduced
Solution Approach 1:
The patent segments the CSI reporting into separate components for direct path and reflected path measurements. The WTRU generates and transmits measurement reports that include distinct information for each path, ensuring complete CSI information is conveyed to the network device without mixing the measurement data, thus maintaining information completeness while enabling efficient processing.
Data Source
AI summary
Described herein are systems, methods and instrumentalities associated with a wireless communication network comprising a reconfigurable intelligent surface (RIS). A wireless transmit/receive unit (WTRU) in such a communication network may receive measurement configuration information that may indicate at least a first measurement resource and a second measurement resource. The first measurement resource may be associated with a first transmission path associated with a first subset of elements of the RIS, while the second measurement resource may be associated with a second transmission path independent of the RIS. The WTRU may perform measurements based on the measurement configuration information, and may transmit a report regarding at least one of the measurements to the network.