Link Self-Adaptation via CQI Feedback for Wireless Spectrum Efficiency
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Solution Overview
Problem
The rapid development of wireless communication technologies has highlighted the need for more efficient utilization of limited spectrum resources, as traditional fixed information transmission parameters are not suitable for time-varying wireless channels, leading to suboptimal performance.
Innovation Solution
A method for implementing link adaptation based on Channel Quality Information (CQI) feedback, where a network device sends a physical frame with a downlink sounding channel and CQI feedback resource indication to a terminal device, which estimates the channel quality and feeds back CQI, allowing the network device to select adaptive transmission parameters.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If fixed information transmission parameters are used in traditional wireless communication systems, then device complexity is reduced and operation is simplified, but spectrum utilization efficiency deteriorates and system performance worsens due to inability to adapt to time-varying channels
Solution Approach 1:
The terminal device autonomously measures downlink channel quality based on sounding channels, determines its own CQI values, and feeds back selected CQI information to the network device without requiring complex network-side channel measurement and estimation, enabling the system to adapt to time-varying channels while keeping device complexity manageable
Solution Approach 2:
The terminal device measures downlink channel quality, determines CQI values representing different channel conditions, and feeds back selected CQI information to the network device, which uses this feedback to adaptively select transmission parameters, creating a closed-loop system that improves adaptability through information feedback
2Measurement precision
If comprehensive channel quality information is collected and processed by the network device, then transmission parameter selection accuracy is improved, but signaling overhead increases and system resource consumption worsens
Solution Approach 1:
The terminal device extracts and measures only the necessary downlink channel quality information from sounding channels, determines relevant CQI values, and feeds back selected CQI information to the network device, extracting only the essential information needed for transmission parameter adaptation while minimizing signaling overhead
Solution Approach 2:
The channel quality information is segmented into multiple CQI values representing different channel conditions (e.g., different modulation and coding schemes), and the terminal device selectively feeds back only the most relevant CQI values based on current channel state, dividing the information into manageable segments that reduce overall feedback overhead
Data Source
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AI summary
Disclosed is a method for implementing link self-adaptation, comprising: sending a downlink sounding channel and a channel quality information CQI feedback resource indication; and receiving CQI information, and selecting a suitable transmission mode for downlink data transmission according to the CQI information. Further disclosed are a network device and a terminal device. By using the method and devices provided in the present invention, the spectrum utilization rate and system performance can be improved.