CSI Target-Layer Feedback to Cut Air Interface Overhead
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Solution Overview
Problem
The increasing complexity of wireless communication networks due to diverse services and advanced technologies poses challenges in network planning, operation, and maintenance, particularly in managing channel state information (CSI) efficiently.
Innovation Solution
A CSI sending and receiving method that allows terminals to send CSI at a target layer based on indication from the access network device, reducing unnecessary air interface overheads by sending specific CSI components such as eigenvector matrices or quantization information, and enabling joint or separate feedback of ground truth and conventional CSI.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If the terminal sends PMIs of n layers with highest quality to the access network device, then the CSI feedback completeness is improved, but the air interface overheads increase
Solution Approach 1:
The patent extracts only the necessary CSI components (eigenvector matrices or quantization information) at the target layer indicated by the access network device, rather than sending all PMI layers. This selective extraction reduces air interface overheads while maintaining the completeness of feedback for the specific layers needed by the network device for AI processing.
Solution Approach 2:
The patent applies local quality by sending different types of CSI information (eigenvector matrices, quantization information, eigenvalues, or singular values) specifically at the target layer indicated by the access network device. This localized approach ensures that the terminal provides high-quality, relevant CSI data for AI model training and inference without transmitting unnecessary information across all layers.
2Measurement precision
If the terminal sends comprehensive CSI information including eigenvector matrices, then the CSI accuracy is improved, but the air interface overheads increase
Solution Approach 1:
The patent changes the parameter of CSI representation by offering multiple formats (eigenvector matrices, quantization information, eigenvalues, or singular values) for the terminal to send based on access network device indication. This allows the terminal to maintain high CSI accuracy by sending the most appropriate representation format while reducing air interface overheads through selective transmission at the target layer.
3Adaptability or versatility
If the network supports multiple advanced technologies and services, then the network functionality is improved, but the network planning and resource scheduling complexity increases
Solution Approach 1:
The patent applies universality by designing a CSI feedback mechanism that can serve multiple functions: traditional CSI feedback for beam management and precoding, as well as AI model training and inference. The access network device can indicate different target layers and CSI types based on specific needs, making the same feedback channel versatile for various network functions and services without increasing overall system complexity.
Data Source
AI summary
Examples of channel state information (CSI) sending methods, CSI receiving methods, and an apparatus are provided. In one example method, a first communication apparatus receives first information from a second communication apparatus, where the first information includes indication information that indicates the first communication apparatus to send CSI at a target layer. The first communication apparatus sends a first CSI report to the second communication apparatus, where the first CSI report includes the CSI at the target layer.