CSI Reporting Framework for CJT Resource Pairing Selection
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Solution Overview
Problem
The current NR system lacks accurate CSI measurement and reporting for coherent joint transmission (CJT) and incurs high overhead when reporting CSI for multiple transmission points, especially with four or more TRPs, making it impossible to optimize feedback for coordinated transmission.
Innovation Solution
A method for configuring CSI-RS resource and reporting configurations to enable accurate CSI measurement and feedback based on recommended resource pairing groups and transmission schemes, optimizing CSI reporting for CJT and reducing overhead.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If CSI reporting is performed for coordinated channels of all transmission points, then measurement precision is improved, but feedback overhead increases greatly
Solution Approach 1:
The patent segments the CSI reporting process by dividing transmission points into two categories: selected transmission points (whose CSI is reported) and non-selected transmission points (whose CSI is not reported). The network device configures a selection criterion that enables the terminal to selectively report CSI only for certain transmission points based on channel quality thresholds, thereby reducing feedback overhead while maintaining measurement precision for the most important TRPs
Solution Approach 2:
The patent extracts only the essential CSI information from the complete set of transmission points. By configuring a selection criterion, the system extracts and reports CSI only for transmission points that meet the channel quality threshold, removing unnecessary CSI reporting for other transmission points, thus reducing feedback overhead while preserving measurement precision for relevant TRPs
2Device complexity
If CSI enhancement is performed only on NCJT mode, then device complexity is reduced, but adaptability deteriorates
Solution Approach 1:
The patent implements a universal CSI reporting framework that can adapt to multiple transmission modes (both NCJT and CJT) through a single configurable selection criterion. The same framework structure handles different transmission schemes by adjusting the selection criterion parameters, providing multi-functionality without requiring separate complex frameworks for each mode, thus improving adaptability while controlling device complexity
3Productivity
If four or more transmission points are added for coherent coordinated transmission, then transmission performance is improved, but feedback overhead becomes unmanageable
Solution Approach 1:
The patent applies segmentation by dividing the set of four or more transmission points into selected and non-selected groups based on channel quality. The selection criterion enables the terminal to identify and report CSI only for the most relevant transmission points (e.g., those with channel quality above a threshold), thereby managing feedback overhead even when many transmission points are available, while still achieving high transmission performance through coordinated transmission from multiple selected TRPs
Data Source
AI summary
Embodiments of the present disclosure provide a CSI reporting method, a terminal, a network device, an apparatus, and a storage medium. The method is applied to a terminal, and comprises: receiving a CSI-RS resource configuration and a CSI reporting configuration sent by a network device; determining one or more recommended resource pairing groups in a plurality of resource pairing groups, and/or determining some of recommended CSI-RS resources in the groups; and reporting, on the basis of the CSI reporting configuration, CSI obtained by measurement using the CSI-RS resources in the recommended resource pairing groups, and reporting the recommended resources. By means of the CSI reporting method provided by the embodiments of the present disclosure, the terminal can implement feedback of CSI situations of different transmission schemes and recommended selection of corresponding resource pairing groups under the different transmission schemes according to the CSI-RS resource configuration and the CSI reporting configuration, to further feed back a more real channel state, thereby improving the transmission performance during multi-point cooperation, and reducing the feedback overhead.