CSI Feedback Compensation for Accurate Downlink Channel Quality
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Solution Overview
Problem
In AI-based CSI feedback scenarios, terminal devices struggle to accurately reflect downlink channel quality due to the lack of a CSI reconfigurator with performance comparable to the network device, leading to inconsistent CSI parameter reporting and suboptimal network configurations.
Innovation Solution
The terminal device compensates its CSI parameter values using a first compensation amount to account for the difference in channel quality when the network device uses a different precoder, enabling accurate reflection of downlink channel quality without requiring a CSI reconfigurator with identical performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the terminal device deploys a CSI reconfigurator with same or similar performance as the network device to obtain the precoder, then the terminal device can accurately determine the precoder used by the network device, but the complexity and performance requirements of the terminal device increase
Solution Approach 1:
The patent introduces a compensation amount as an intermediary parameter to bridge the gap between terminal device measurements and network device actual performance. Instead of requiring the terminal to replicate the network's CSI reconfigurator, the terminal measures channel quality with a simpler local reconfigurator and then applies a compensation factor (derived from historical data or network feedback) to adjust the measurement results, thereby obtaining accurate precoder information without deploying a complex high-performance reconfigurator.
Solution Approach 2:
The patent changes the parameter representation from direct precoder determination (requiring complex reconfigurators) to compensated channel quality indicators. The terminal device reports compensated CQI values that reflect actual downlink channel quality after accounting for precoder differences, transforming the measurement approach from direct precoder recovery to adjusted quality assessment.
2Reliability
If the terminal device uses a CSI reconfigurator with same or similar performance as the network device, then the terminal device can obtain accurate precoder information, but the performance requirements of the terminal device increase
Solution Approach 1:
The compensation amount serves as a mediator that translates terminal device measurements into network-device-equivalent accuracy. The terminal uses a standard performance reconfigurator for measurements, then applies the compensation factor (which captures the performance gap between terminal and network reconfigurators) to achieve reliable precoder information without requiring the terminal to meet high performance requirements.
3Ease of operation
If the terminal device reports CSI parameter values without compensation, then the terminal device simplifies the measurement process, but the reported values do not accurately reflect actual downlink channel quality
Solution Approach 1:
The patent performs preliminary compensation calculation before CSI feedback reporting. The terminal device pre-calculates or receives compensation factors that account for precoder differences, and then applies these factors to measurement results before reporting. This preliminary action ensures that the simplicity of the measurement process is maintained while achieving accurate channel quality reflection in the final reported values.
Data Source
AI summary
Embodiments of this application provide a communication method and a communication apparatus. The method includes: A terminal device determines a first parameter value of a first parameter based on a measurement result of a first downlink reference signal and a first precoder, where the first parameter reflects downlink channel quality; and obtains a parameter value of a second parameter based on a first compensation amount and the first parameter value of the first parameter, and reports the parameter value of the second parameter, where the first compensation amount indicates a difference between downlink channel quality in a case in which a network device uses the first precoder and downlink channel quality in a case in which the network device uses a second precoder. In the solutions in embodiments of this application, the parameter value reported by the terminal device can accurately reflect actual downlink channel quality.