Differential Channel State Information Reporting
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Solution Overview
Problem
In mobile communication technology, the short feedback period of channel state information (CSI) leads to large signaling overhead, making it inefficient for terminals to report CSI to network devices.
Innovation Solution
A method where a terminal sends first channel state information that includes difference information relative to second channel state information, with the sending time of the second channel state information being earlier than that of the first channel state information, thereby reducing the need to send complete channel state information.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If complete channel state information is reported frequently, then the feedback period is short and measurement precision is improved, but signaling overhead increases
Solution Approach 1:
The patent extracts and reports only the differential portion of channel state information rather than complete CSI. The terminal device calculates the difference between current CSI and previous CSI, and only reports this difference information to the network device, thereby reducing signaling overhead while maintaining feedback precision.
Solution Approach 2:
The patent changes the reporting parameter from complete channel state information to differential channel state information. By transforming the reporting content from absolute values to relative differences, the signaling overhead is reduced while the essential channel state changes are still captured for accurate precoding adjustment.
2Loss of information
If complete channel state information is reported, then information completeness is improved, but transmission efficiency decreases
Solution Approach 1:
The patent extracts only the essential differential information from complete channel state information. By identifying and reporting only the changed portions of CSI (such as differential precoding matrix indicator, differential channel quality indicator), the information completeness for precoding purposes is maintained while transmission efficiency is improved through reduced data volume.
Solution Approach 2:
The patent applies partial action by reporting only the necessary differential portion of CSI rather than complete information. The differential reporting includes only the essential elements needed for precoding adjustment (differential PMI, differential CQI, differential rank indicator), achieving sufficient information completeness with reduced transmission overhead.
Data Source
AI summary
A method for reporting information includes that the terminal sends first channel state information to the network device, and the network device receives the first channel state information sent by the terminal. The first channel state information includes difference information relative to second channel state information, and a sending time of the second channel state information is earlier than a sending time of the first channel state information time, the network device receives the first channel state information sent by the terminal.