Selective CSI Feedback Triggering for Lower Uplink Signaling
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Solution Overview
Problem
Existing communication methods for channel state information (CSI) transmission in wireless networks result in high signaling overheads due to frequent unnecessary CSI feedback, particularly in periodic and semi-persistent CSI modes, which is inefficient and increases latency.
Innovation Solution
A method where a terminal device determines a feedback information set and sends channel state information or an uplink reference signal only when specific conditions are met, such as a high ratio or quantity of negative acknowledgments (NACKs), allowing for reduced signaling and latency by selectively sending CSI.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the terminal device frequently sends channel state information (CSI) to improve transmission reliability, then the reliability of data transmission is improved, but the signaling overhead increases
Solution Approach 1:
The patent extracts only the essential feedback information (ACK/NACK) from the complete CSI feedback mechanism. Instead of transmitting full CSI reports frequently, the system selectively transmits only acknowledgment information indicating whether downlink data was successfully received, thereby reducing signaling overhead while maintaining transmission reliability
Solution Approach 2:
The patent implements partial feedback action by sending ACK/NACK information only when necessary (when downlink data is received or expected), rather than continuously transmitting complete CSI. This partial action approach reduces the frequency and volume of uplink transmissions, lowering signaling overhead while preserving the essential function of transmission reliability monitoring
2Measurement precision
If the terminal device sends CSI frequently to ensure accurate channel state information, then the accuracy of channel state information is improved, but the latency increases
Solution Approach 1:
The patent extracts only the critical acknowledgment status (ACK/NACK) from complete CSI feedback, eliminating unnecessary detailed channel state reports. This extraction reduces the time required for CSI measurement, processing, and transmission, thereby reducing latency while maintaining the essential function of monitoring transmission accuracy through acknowledgment feedback
3Loss of information
If the network device triggers the terminal device to measure channel and send CSI, then the channel state information can be obtained, but unnecessary measurements and transmissions occur
Solution Approach 1:
The patent implements a feedback-based triggering mechanism where the network device decides whether to request CSI measurement and transmission based on the terminal device's ACK/NACK feedback history. When the terminal sends NACK (indicating poor reception), the network triggers CSI measurement to improve future transmissions. When ACK is sent (good reception), no CSI measurement is triggered. This feedback-driven approach eliminates unnecessary measurements and transmissions, reducing energy consumption while ensuring CSI is obtained only when needed
Data Source
AI summary
A communication method and apparatus resolve a problem that a terminal device frequently sends channel state information or an uplink reference signal, so that signaling overheads of the terminal device can be reduced. The method includes: determining a first feedback information set, and sending first channel state information or a first uplink reference signal to a network device when the first feedback information set meets a first condition. The first feedback information set includes at least one piece of feedback information, and the feedback information is a negative acknowledgment NACK or an acknowledgment ACK.