CRI-Based CSI Reporting for Hybrid Beamforming
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Solution Overview
Problem
Current wireless communication systems face challenges in efficiently managing channel state information (CSI) reporting, particularly in 5G and future communication systems, due to increased data traffic and the need for robust coverage and mobility, where existing CSI reporting methods are inefficient and limited in supporting high-resolution CSI feedback for multiple antenna ports.
Innovation Solution
The implementation of a user equipment (UE) and base station (BS) system that measures and transmits CSI reports based on multiple CSI-RS resources, including CSI-RS resource indicators, precoding matrix indicators, and channel quality indicators, allowing for flexible configuration and reduced overhead through CRI-based CSI reporting, enabling support for hybrid beamforming and multiple hypotheses.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If traditional CSI reporting methods are used, then system simplicity is maintained, but CSI reporting efficiency and accuracy deteriorate in high-traffic and high-mobility scenarios
Solution Approach 1:
The patent segments the CSI reporting process by introducing multiple CSI-RS resources (Ks resources) that can be independently measured and reported. The UE measures multiple CSI-RS resources and selects M resources to report, dividing the overall CSI feedback into multiple manageable components (CRIs, PMIs, CQIs) that can be processed and transmitted separately, thereby improving reporting efficiency without overwhelming system complexity
Solution Approach 2:
The patent implements dynamic CSI reporting by allowing the UE to select M CSI-RS resources out of Ks available resources based on current channel conditions. The configuration of Ks and M parameters can be dynamically adjusted, and the UE adaptively chooses which resources to measure and report, enabling the system to flexibly respond to varying traffic and mobility conditions while maintaining manageable complexity through standardized procedures
2Measurement precision
If multiple CSI-RS resources are configured for high-resolution CSI feedback, then measurement precision improves, but feedback overhead increases
Solution Approach 1:
The patent extracts only the most essential CSI information from multiple measured resources. Instead of reporting all Ks CSI-RS resource measurements, the UE selects M resources (where M < Ks) and reports only the CRI, PMI, and CQI for these selected resources. This extraction approach maintains high measurement precision by evaluating multiple resources while reducing feedback overhead by transmitting information for only M resources
Solution Approach 2:
The patent applies partial action by having the UE measure all Ks CSI-RS resources (excessive measurement) but report information for only M resources (partial reporting). This allows the system to benefit from comprehensive channel sampling for accurate resource selection while limiting the actual feedback overhead to a manageable level by reporting only a subset of the measured resources
3Adaptability or versatility
If existing CSI reporting methods are used, then device complexity is low, but adaptability to hybrid beamforming and multiple hypotheses deteriorates
Solution Approach 1:
The patent creates a universal CSI reporting framework that can handle multiple scenarios through a single mechanism. The same CSI reporting procedure supports both single-hypothesis and multi-hypothesis cases, accommodates different numbers of CSI-RS resources (Ks), and works with varying values of M. This multi-functional approach enables support for hybrid beamforming and multiple hypotheses without requiring separate specialized mechanisms for each scenario, managing complexity through unified procedures
Data Source
AI summary
Apparatuses and methods for enhancement of channel state information (CSI) reporting for hybrid beamforming. A method performed by a user equipment (UE) includes receiving information about a CSI report, Ks CSI reference signal (CSI-RS) resources, and a value of M, where Ks>1, 1<M≤min (X, Ks), and X is an integer. The method further includes, based on the information, measuring the Ks CSI-RS resources and determining the CSI report associated with M CSI-RS resources out of the Ks CSI-RS resources. The CSI report includes M CSI-RS resource indicators (CRIs), M precoding matrix indicators (PMIs), and M channel quality indicators (CQIs). The method further includes transmitting the CSI report.