CSI Feedback Mapping for Flexible Multi-Layer MIMO Reporting
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Solution Overview
Problem
The complexity and dispersion of CSI feedback in MIMO transmission systems, particularly in 5G systems, result from the variety of feedback types defined in different LTE standardized versions, impacting flexibility and accuracy.
Innovation Solution
A method for CSI feedback that involves determining CSI measurement resources, correspondence relations between data layer groups and DMRS ports, mapping modes between data layer groups and CSI-RS ports, and configuring transmission and reporting modes to improve flexibility and accuracy, including grouping data layers, configuring DMRS and CSI-RS resources, and mapping relations based on precoding matrices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple feedback types are defined in different LTE standardized versions to support different MIMO transmission modes, then the system can support more transmission modes, but the CSI feedback becomes dispersed and complex
Solution Approach 1:
The patent segments data layers into multiple data layer groups, where each group can be independently configured with specific CSI measurement resources, DMRS ports, and mapping modes. This segmentation allows different transmission modes to be supported while maintaining a unified feedback framework, as each layer group can be independently managed without affecting others.
Solution Approach 2:
The patent creates a universal CSI feedback framework that can accommodate multiple MIMO transmission modes through configurable parameters. The unified structure uses configurable data layer groups, CSI measurement resources, and mapping modes that can be adapted to support various transmission modes (e.g., single-layer, multi-layer, coherent, non-coherent) within a single system design.
2Adaptability or versatility
If data layers are grouped and mapped to multiple CSI-RS ports, then measurement flexibility is improved, but the configuration complexity increases
Solution Approach 1:
The patent introduces dynamic configurability where the number of data layer groups, their composition, and mapping to CSI-RS ports can be flexibly adjusted based on transmission requirements. The system can dynamically configure different numbers of data layers per group and establish different mapping relations, allowing adaptation to various scenarios without fixed rigid structures.
3Measurement precision
If separate CSI measurement resources are configured for each data layer group, then measurement accuracy is improved, but the resource overhead increases
Solution Approach 1:
The patent applies partial action by configuring CSI measurement resources selectively for each data layer group based on actual needs. Not all data layer groups require identical resource configurations - the system can allocate measurement resources partially to specific groups depending on their importance, channel conditions, and transmission requirements, avoiding unnecessary resource overhead while maintaining accuracy where needed.
Data Source
AI summary
Embodiments of the present application provide a method and an apparatus for CSI feedback, an electronic device, and a storage medium. The method for CSI feedback includes: determining a CSI measurement resource corresponding to each data layer group during CSI measurement; determining first correspondence relations between each data layer group and DMRS ports during CSI measurement; determining mapping modes between each data layer group and CSI-RS ports during CSI measurement; determining transmission mode used in CSI measurement and CSI reporting mode corresponding to the transmission mode; and performing CSI feedback according to the CSI measurement resource, the first correspondence relations, the mapping modes, the transmission mode used in the CSI measurement and the CSI reporting mode corresponding to the transmission mode. Therefore, the embodiments of the present application improve flexibility and accuracy of CSI feedback and reduce complexity of CSI feedback.