Dynamic Beam-Set CSI Reporting With Reduced CSI-RS
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Solution Overview
Problem
Existing wireless communication systems face challenges in efficiently measuring and reporting channel state information (CSI) for beam operation, particularly when the amount of CSI-RS is reduced, which affects beamforming performance.
Innovation Solution
A method and apparatus that enables a terminal to receive and report CSI by configuring and adjusting beam sets based on periodic CSI-RS configuration information and changes in the beam set, allowing for high-quality beam reception sensitivity and reduced CSI-RS usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the amount of CSI-RS is reduced, then resource efficiency is improved, but beamforming performance deteriorates
Solution Approach 1:
The patent extracts only the essential CSI-RS resources needed for beam measurement by introducing beam set concepts that selectively identify which CSI-RS resources should be measured and reported, thereby reducing unnecessary CSI-RS usage while maintaining beamforming performance
Solution Approach 2:
The patent implements dynamic beam set configuration where the base station can update beam sets based on channel conditions and service requirements, allowing the system to adaptively adjust the amount of CSI-RS needed while maintaining optimal beamforming performance
2Measurement precision
If beam set configuration is updated frequently, then beamforming accuracy is improved, but signaling overhead increases
Solution Approach 1:
The patent performs preliminary beam set configuration through RRC signaling before actual beamforming operations, establishing a baseline beam set that can be used for multiple transmissions, thereby reducing the need for frequent updates and lowering signaling overhead
Solution Approach 2:
The patent implements feedback mechanisms where the terminal reports beam measurement results and channel state information, allowing the base station to intelligently determine when beam set updates are necessary, thus balancing beamforming accuracy with signaling overhead
Data Source
AI summary
The present disclosure relates to a 5G or 6G communication system for supporting higher data transmission rates. A method performed by a terminal of a communication system according to one embodiment of the present invention may comprise the steps of: receiving, from a base station, periodic channel state information reference signal (CSI-RS) configuration information including IDs of N CSI-RSs; determining a beam set for beam measurement and reporting as a first beam set on the basis of the periodic CSI-RS configuration information; receiving, from the base station, information indicating a change in at least a part of the beam set for the beam measurement and reporting; determining the beam set for beam measurement and reporting as a second beam set on the basis of the information indicating a change in at least a part of the beam set; and receiving a physical downlink shared channel (PDSCH) from the base station on the basis of measurement and reporting based on the second beam set.