Joint CSI Feedback for Large Antenna Port Grouping
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Solution Overview
Problem
CSI measurement precision is low for base stations with an antenna panel having more than a specific quantity of antenna ports due to NZP CSI-RS resource port constraints in current MIMO systems.
Innovation Solution
Classify antenna ports into K antenna port groups, each corresponding to a reference signal resource, and use a codebook type that supports joint measurement and feedback of channel state information, enabling precise CSI measurement even under NZP CSI-RS resource port constraints.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a base station uses NZP CSI-RS with a limited number of resource ports for channel measurement, then the device complexity is reduced, but the CSI measurement precision deteriorates for antenna panels with more than a specific quantity of antenna ports
Solution Approach 1:
The patent segments the antenna ports into multiple antenna port groups (first antenna port group, second antenna port group, etc.), where each group is mapped to a corresponding reference signal resource. This segmentation allows the system to measure channel state information for multiple antenna ports through multiple reference signal resources, thereby improving CSI measurement precision without requiring a single resource with an excessive number of ports, thus resolving the contradiction between measurement precision and device complexity.
2Measurement precision
If the base station classifies antenna ports into multiple antenna port groups with corresponding reference signal resources, then the CSI measurement precision is improved, but the codebook type configuration complexity increases
Solution Approach 1:
The patent introduces a codebook type configuration parameter that indicates whether to use a first codebook or a second codebook for channel state information feedback. The first codebook is used when antenna ports are classified into multiple groups with corresponding reference signal resources, while the second codebook is used otherwise. This parameter change approach allows the system to adapt the codebook selection based on the antenna port grouping configuration, simplifying the codebook configuration complexity while maintaining improved CSI measurement precision through the first codebook's specialized design for multi-group scenarios.
Data Source
AI summary
A communication method and a related apparatus are provided. The method includes: sending first information and second information to a terminal device. The first information indicates K reference signal resources, the K reference signal resources respectively correspond to K antenna port groups, each antenna port group includes at least one antenna port, there is a mapping relationship between antenna ports included in the K antenna port groups and antenna ports included in one antenna array of a network device, and K is an integer greater than 1. The second information indicates a type configuration of a first codebook, and the type configuration of the first codebook indicates the terminal device to report, based on the first codebook, joint channel state information corresponding to the K reference signal resources.