CSI Codebook Reporting for Multi-Time Channel Prediction
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Solution Overview
Problem
Existing wireless communication systems face challenges in accurately transmitting and receiving channel state information (CSI) for multiple time instances, leading to inefficiencies in channel state reporting and potential performance degradation due to increased signaling overhead and complexity.
Innovation Solution
A method and apparatus for transmitting and receiving CSI that involves configuring precoding matrix indicators (PMI) for multiple time instances, adjusting basis vector numbers, and optimizing CSI reporting to minimize information loss and signaling overhead, while improving accuracy and reducing implementation complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If CSI reporting is extended to multiple time instances, then channel state prediction accuracy is improved, but signaling overhead increases
Solution Approach 1:
The patent changes the parameter representation by introducing a codebook structure with basis vectors that can represent multiple time instances. Instead of reporting full CSI matrices for each time instance, the system uses a reduced set of basis vectors (e.g., 2-4 vectors) that span the temporal dimension, thereby reducing signaling overhead while maintaining prediction accuracy through the codebook's temporal coverage capability.
Solution Approach 2:
The patent creates a codebook structure that contains multiple basis vectors representing different time instances. The UE selects and reports only the necessary basis vectors from this pre-defined codebook rather than reporting complete CSI for all time instances, effectively copying only the essential information needed for accurate channel state prediction while reducing the quantity of transmitted data.
2Reliability
If the number of basis vectors in the codebook is increased, then codebook performance is improved, but device complexity increases
Solution Approach 1:
The patent introduces dynamic codebook configuration where the number of basis vectors (e.g., 2, 3, or 4) can be adjusted based on channel conditions and prediction requirements. The system dynamically determines how many basis vectors to use from the codebook, allowing flexible adaptation between codebook performance and implementation complexity without being fixed to a single configuration.
Solution Approach 2:
The patent segments the codebook into a manageable number of basis vectors (2-4 vectors) that can be independently selected and reported. This segmentation allows the system to maintain good codebook performance by using a limited number of representative vectors rather than exhaustively listing all possible channel states, thereby reducing device complexity while preserving reliability.
3Measurement precision
If more time instances are compressed into the CSI report, then channel state accuracy is improved, but information loss increases
Solution Approach 1:
The patent changes the representation parameters by using a codebook of basis vectors that are specifically designed to capture the essential temporal variations in channel state. Instead of compressing arbitrary CSI data, the system transforms the data into a reduced basis representation where the number of basis vectors (2-4) is optimized to balance compression benefits with information preservation, minimizing information loss while maintaining accuracy.
Solution Approach 2:
The patent copies only the essential temporal characteristics of the channel state into the codebook basis vectors. By selecting a representative set of basis vectors that capture the dominant temporal patterns, the system can compress multiple time instances into a compact representation without significant information loss, as the basis vectors are designed to preserve the critical channel state information.
Data Source
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AI summary
Disclosed are a method and device for transmitting and receiving channel state information in a wireless communication system. The method according to an embodiment disclosed herein may comprise the steps of: receiving configuration information related to CSI from a base station; receiving a CSI-RS on K (K is a natural number) CSI-RS resources from the base station; and transmitting the CSI to the base station, wherein the CSI includes PMIs corresponding to codebook indexes.