CSI Feedback Configuration for 3D Beamforming
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Solution Overview
Problem
Existing wireless communication systems face limitations in optimizing beam-forming due to fixed vertical beam adjustments, leading to suboptimal performance and increased inter-cell interference, as they cannot dynamically adjust beams in three dimensions.
Innovation Solution
A method and apparatus for feeding back CSI (Channel State Information) that allows separate reporting of positional information and CSI, enabling the base station to configure and adjust beam-forming vectors dynamically in both horizontal and vertical directions, using multiple CSI feedback configurations and signaling mechanisms to support flexible downlink scheduling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If fixed vertical beam adjustments are used in horizontal antenna arrays, then device complexity is reduced, but system performance cannot be optimized and inter-cell interference increases
Solution Approach 1:
The patent transitions from traditional two-dimensional (horizontal) beamforming to three-dimensional beamforming by adding vertical beam adjustment capabilities. The base station configures multiple CSI feedback configurations, each associated with different vertical beam-forming vectors, enabling spatial optimization in both horizontal and vertical dimensions to improve system performance while managing complexity through structured configuration
2Adaptability or versatility
If multiple CSI feedback configurations with different vertical beam-forming vectors are configured, then vertical beam adjustment capability is improved, but feedback overhead and configuration complexity increase
Solution Approach 1:
The patent segments the CSI feedback configuration into multiple independent configurations, each associated with specific vertical beam-forming vectors. The base station configures N CSI processes with different vertical beam settings, allowing the system to divide the complex 3D beamforming task into manageable segments that can be independently measured and reported by the UE
Solution Approach 2:
The patent enables dynamic selection of CSI feedback configurations based on current channel conditions. The UE measures CSI for multiple configured CSI processes and reports feedback for the configuration that provides optimal performance, allowing the system to adapt dynamically between different vertical beam configurations rather than being fixed
3Measurement precision
If separate reporting of positional information and CSI is implemented, then detection precision is improved, but signaling overhead increases
Solution Approach 1:
The patent merges the reporting of CSI and positional information into a unified feedback mechanism. The UE reports CSI for specific CSI processes that are associated with particular vertical beam-forming vectors, combining what would otherwise be separate reports into a single integrated feedback message that reduces overall signaling overhead while maintaining detection precision
Data Source
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AI summary
The present application provides a channel state information (CSI) feedback and receiving method and device. The CSI feedback method by a UE comprises: determining, according to an indication of a base station, at least one CSI feedback configuration group configured by the base station, wherein each CSI feedback configuration group comprises at least one CSI feedback configuration; and upon determination of a need to report CSI, reporting, via a PUCCH or PUSCH, to the base station CSI acquired based on a first CSI feedback configuration, wherein the first CSI feedback configuration is a CSI feedback configuration determined, according to location information of a CSI feedback configuration in the most recent report or location information of a CSI feedback configuration indicated by the base station, from a corresponding CSI feedback configuration group by the UE. The present application supports independent reporting of location information and corresponding CSI, thus improving the detection performance of such information, and further supports a base station to acquire CSI corresponding to a specified CSI feedback configuration, thus enabling more flexible downlink scheduling and transmission.