CSI Reporting Method for Rel-16 Codebook Feedback Overhead
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
There is no corresponding method for reporting Channel State Information (CSI) for the Rel-16 codebook structure in wireless communication technology, leading to inefficiencies in feedback overhead, particularly with large numbers of subbands.
Innovation Solution
A method and device for reporting CSI that includes determining codebook indication information, such as beam, base vector, and non-zero coefficient information, to efficiently convey channel state information to the network side device, reducing feedback overhead by identifying shared information across multiple data transmission layers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the Type II codebook feedback includes both subband beam phase combining coefficient and subband beam amplitude coefficient for each subband, then channel quantization accuracy is improved, but feedback overhead increases significantly when the quantity of subbands is large
Solution Approach 1:
The patent segments the feedback information into two distinct parts: Part 1 contains first codebook indication information (beam information, base vector information, non-zero coefficient indication information) that is common across multiple subbands, while Part 2 contains second codebook indication information (compression coefficients) specific to each subband. This segmentation allows the system to reduce overall feedback overhead by transmitting shared information once rather than repeating it for each subband, while still maintaining channel quantization accuracy through the inclusion of subband-specific compression coefficients.
2Quantity of substance
If compression is applied to coefficients of each subband in the Rel-16 low-overhead Type II codebook, then feedback overhead is reduced, but there is no corresponding CSI reporting method available
Solution Approach 1:
The patent performs preliminary compression on the subband coefficients before feedback transmission. Specifically, it applies compression to the subband beam phase combining coefficients and subband beam amplitude coefficients to generate compression coefficients, which are then included in the second codebook indication information. This preliminary compression action reduces the amount of data that needs to be transmitted for each subband, thereby reducing feedback overhead while maintaining the ability to represent channel state information accurately.
Solution Approach 2:
The patent introduces a new dimensional structure for CSI reporting by dividing codebook indication information into two distinct parts (Part 1 and Part 2) with different purposes and transmission characteristics. Part 1 contains shared information that can be reused across subbands, while Part 2 contains compressed subband-specific information. This dimensional organization creates a new feedback framework that accommodates the Rel-16 low-overhead codebook structure and enables systematic compression without losing essential channel information.
3Loss of information
If beam information, base vector information, and non-zero coefficient information are reported for each data transmission layer independently, then channel state information completeness is improved, but feedback overhead increases
Solution Approach 1:
The patent merges the reporting of beam information, base vector information, and non-zero coefficient indication information into a unified first codebook indication information structure that is common across multiple data transmission layers. By combining these three types of information into a single shared representation that can be applied to multiple layers, the system maintains complete channel state information for all layers while avoiding the redundancy of transmitting identical information separately for each layer, thereby reducing overall feedback overhead.
Data Source
AI summary
Disclosed are a channel state information reporting method and device, relating to the field of wireless communications and used for solving the problem of no corresponding CSI reporting method being provided at present regarding a Rel-16 codebook structure. The method of the present application includes a terminal determining, according to codebook parameter information, codebook indication information corresponding to a data transmission layer; and the terminal sending channel state information (CSI) including the codebook indication information to a network side device, and the codebook indication information includes a part or all of the following: beam information for determining a precoding matrix orthogonal combination beam, base vector information for determining a precoding matrix compression base vector, and nonzero coefficient indication information for determining a precoding matrix compression coefficient.