CSI Reporting Reducing Reference Signal Overhead
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Solution Overview
Problem
As the number of antenna ports increases in LTE systems, the reference signal resource overheads in CSI processes become significant, particularly between non-beamforming and beamforming CSI-RS resources, affecting spectrum efficiency.
Innovation Solution
The method involves using a terminal to determine and report precoding matrix indicators (PMIs) for a non-beamforming reference signal resource, which are then used by the base station to determine PMIs for a beamforming resource, reducing resource overheads by leveraging a lower-dimensional PMI to improve beamforming accuracy and system performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the number of antenna ports is increased to improve spectrum efficiency, then the reference signal resource overheads in CSI processes increase
Solution Approach 1:
The patent segments the PMI reporting into two parts: first PMIs for non-beamforming reference signal resources and second PMIs for beamforming reference signal resources. This segmentation allows the system to use lower-dimensional first PMIs to indicate non-beamforming resources, reducing the overall PMI dimension and reference signal overhead while maintaining support for multiple antenna ports
Solution Approach 2:
The patent changes the parameter dimension of PMI by introducing a reduced-dimensional first PMI for non-beamforming resources. Instead of using full-dimensional PMIs for all resources, the system uses lower-dimensional first PMIs that require fewer bits for reporting, thereby reducing reference signal resource overheads while maintaining the ability to support increased antenna ports
2Quantity of substance
If the dimension of PMI is reduced to decrease reporting overhead, then the beamforming accuracy may be compromised
Solution Approach 1:
The patent segments PMI reporting into first PMIs (lower dimension) for non-beamforming resources and second PMIs (higher dimension) for beamforming resources. This segmentation allows the system to use only lower-dimensional information where sufficient while reserving higher-dimensional second PMIs specifically for beamforming operations where precision is critical
Solution Approach 2:
The first PMIs serve as an intermediary that provides sufficient information for non-beamforming resource indication without requiring full beamforming precision. The base station uses these first PMIs to determine appropriate second PMIs for beamforming, creating a two-stage process that optimizes both overhead reduction and accuracy maintenance
Data Source
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Figure 3B
AI summary
The present invention discloses a channel state information reporting method, including: determining, by a terminal, R first precoding matrix indicators PMIs of M first reference signal resources, and determining a channel quality indicator CQI based on the R first PMIs, where M and R are integers greater than or equal to 1; and reporting, by the terminal, channel state information, where the channel state information includes the R first PMIs and N CQIs, or the channel state information includes the R first PMIs and one CQI, the R first PMIs are used by a base station to determine P second PMIs according to a first operational criterion, a dimension of the second PMI is greater than a dimension of the first PMI, and P and N are integers greater than or equal to 1. Embodiments of the present invention further provide a channel state information reading method a related device. In the embodiments of the present invention, reference signal resource overheads in a CSI process can be reduced.