Configurable CSI Codebooks for Precise UE Channel Reporting
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Solution Overview
Problem
Existing wireless communication systems face challenges in accurately estimating the channel state between user equipment and base stations, which affects efficient data communication.
Innovation Solution
Implementing a method for CSI reporting that involves configuring a UE with codebook parameters (M, α, β) to determine the number of CSI-RS ports and non-zero coefficients, enabling precise CSI reporting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional channel estimation methods are used, then the system complexity is low, but the channel state information accuracy is insufficient
Solution Approach 1:
The patent segments the channel state information reporting into multiple components: channel quality indicator (CQI), precoding matrix indicator (PMI), and rank indicator (RI). Each component is reported separately with different codebook configurations, allowing the system to achieve high measurement precision while managing complexity through structured segmentation of the reporting process
Solution Approach 2:
The patent introduces configurable codebook parameters including codebook type (Type I or Type II), number of beams, and reporting periodicity. These parameters can be dynamically adjusted based on channel conditions and UE capabilities, enabling the system to optimize between measurement precision and reporting complexity by changing operational parameters rather than restructuring the entire system
2Measurement precision
If detailed CSI reporting is implemented, then the channel estimation accuracy improves, but the signaling overhead increases
Solution Approach 1:
The patent implements partial reporting by allowing the UE to report only the most significant channel components based on channel conditions. When channel quality is good, full-detailed CSI reporting is performed. When channel quality degrades, the system switches to reduced reporting modes that transmit only essential information, thereby reducing signaling overhead while maintaining adequate channel estimation accuracy
Solution Approach 2:
The patent enables dynamic switching between different CSI reporting modes (full reporting, partial reporting, and minimal reporting) based on real-time channel conditions and network requirements. This dynamic adaptation allows the system to optimize the balance between measurement precision and signaling overhead by adjusting the reporting detail level according to current operational needs
3Measurement precision
If codebook parameters are configured for CSI reporting, then the channel measurement precision improves, but the processing complexity increases
Solution Approach 1:
The patent performs preliminary configuration of codebook parameters through higher-layer signaling (RRC configuration) before actual CSI reporting occurs. The gNB configures the UE with codebook type, number of beams, and reporting periodicity in advance, so that during actual channel measurement and reporting, the UE can efficiently process using pre-configured parameters rather than determining them in real-time, thereby reducing processing complexity while maintaining high measurement precision
Data Source
AI summary
A method for operating a user equipment (UE) comprises receiving configuration information about a channel state information (CSI) report, the configuration information including codebook parameters (M, α, β), wherein: M is a number of frequency domain basis vectors, α is a number≤1, and β is a number≤1; identifying values of M, α, and β; determining a value of K1 based on α, where K1 is a number of selected CSI reference signal (CSI-RS) ports from a total of P CSI-RS ports; determining a maximum number of non-zero coefficients based on β; determining the CSI report based on the values of M, K1, and the maximum number of non-zero coefficients; and transmitting the CSI report.