CSI Codeword Compression for Lower MIMO Reporting Overhead
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In mobile communication systems, the increase in the number of antennas used for signal transmission, particularly with MIMO technology, leads to high information overheads during channel state information (CSI) reporting, which is a pressing issue that needs to be addressed.
Innovation Solution
A method where a terminal device generates a first codeword based on a second codeword, with a reduced number of elements, and feeds it back to a network device, using a dictionary matrix to compress the CSI, allowing for efficient reporting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the number of antennas is increased to improve signal transmission quality, then the channel state information accuracy is improved, but the information overhead during CSI reporting increases
Solution Approach 1:
The patent extracts and reports only the most significant components of CSI (precoding matrix indicator and channel quality indicator) while compressing less critical information (precoding type indicator and spatial relation information), thereby reducing overall information overhead while maintaining essential channel state accuracy
Solution Approach 2:
The patent changes the reporting parameters by using compact representations such as differential encoding for precoding type indicators and selective reporting based on threshold comparisons, which reduces the number of bits required to represent channel state information while preserving measurement precision
2Quantity of substance
If dual-domain compression is used for CSI reporting, then information overhead is reduced, but the complexity of the reporting mechanism increases
Solution Approach 1:
The patent segments CSI reporting into multiple parts with different compression levels: highly compressed precoding matrix indicators, differential precoding type indicators, and selective spatial relation information. This segmented approach reduces overall complexity compared to compressing the entire CSI matrix while still achieving significant overhead reduction
Solution Approach 2:
The patent applies partial compression by reporting only the most critical CSI components in full detail while providing compressed or differential representations for less critical parameters, avoiding the excessive complexity of full dual-domain compression while achieving practical overhead reduction
Data Source
AI summary
An information transmission method and apparatus. In the method, a terminal device generates a first codeword, where the first codeword is obtained based on a second codeword, a quantity of elements included in the second codeword is greater than a quantity of elements included in the first codeword, the second codeword is associated with a first coefficient set of a downlink channel, and the first coefficient set includes an element included in at least one row vector or column vector of a first coefficient matrix; and then the terminal device feeds back the first codeword to a network device. The terminal device can indicate a position and a numerical value of an element in the first coefficient set by reporting only the first codeword. This manner is simple. In addition, a codeword length of the first codeword is shorter than a codeword length of the second codeword.