Combined Channel State Information Feedback for Wireless Reliability
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Solution Overview
Problem
In wireless communication systems, particularly in multi-carrier systems, there is a challenge in efficiently transmitting channel status information (CSI) between base stations and mobile stations, where frequency resources are saturated, and existing methods struggle to ensure reliable communication due to issues with transmitting and interpreting CSI across multiple carriers.
Innovation Solution
A method where a mobile station receives a reference signal from a base station, transmits first and second channel information to indicate a precoding matrix, with the first information transmitted in specific subframes and the second information determined based on the most recently transmitted first information if the first is dropped, ensuring continuous CSI feedback and improved communication reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple pieces of channel status information are transmitted to ensure reliable communication, then communication reliability is improved, but transmission overhead and resource consumption increase
Solution Approach 1:
The patent combines multiple channel status information pieces into a single transmitted message. Specifically, it merges first channel information (precoding matrix indicator) and second channel information (channel quality indicator) into one unified feedback message, reducing the number of separate transmissions while maintaining complete channel state representation for reliable communication
Solution Approach 2:
The patent creates a universal channel status information structure that serves multiple functions simultaneously. The combined message structure can represent different channel states through coordinated values of first and second channel information, allowing a single transmission to cover multiple communication scenarios and reduce overall transmission overhead
2Measurement precision
If channel status information is transmitted frequently to maintain accuracy, then measurement precision is improved, but transmission resource consumption increases
Solution Approach 1:
The patent merges channel quality indicator and precoding matrix indicator into a single combined channel status information message, reducing the number of separate transmissions required while maintaining comprehensive channel state accuracy through the coordinated representation in the unified structure
3Reliability
If complete channel status information is transmitted to ensure accurate precoding, then communication reliability is improved, but transmission time increases
Solution Approach 1:
The patent combines first channel information and second channel information into a single transmitted message, reducing the number of separate transmission events while ensuring complete channel state representation for accurate precoding through the unified message structure
Data Source
AI summary
A method for transmitting channel status information of a user equipment (UE) in a wireless communication system. The UE reports first channel information to a base station periodically; and reports second channel information to the base station periodically. The first channel information and the second channel information are pieces of information combined to indicate one precoding matrix. The second channel information reported in a specific subframe is calculated based on last reported first channel information. A channel quality indicator (CQI) reported in the specific subframe is calculated based on one precoding matrix indicated by the last reported first channel information and the second channel information reported in the specific subframe.