Channel Quality Indicator Reporting via Frequency Interval Selection
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Solution Overview
Problem
Existing channel quality information (CQI) feedback methods in wireless communication systems suffer from high signaling overhead and lack of scheduling flexibility, as they often require reporting individual CQI values for each frequency interval, which can lead to inefficient use of resources and destruction of channel information due to averaging.
Innovation Solution
The method involves determining and transmitting channel quality indicators for a subset of preferred frequency intervals, along with correlated adjacent intervals, allowing the reconstruction of channel quality information with reduced signaling overhead by exploiting correlation between frequency intervals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If individual CQI values are reported for each frequency interval, then channel information accuracy is improved, but signaling overhead increases
Solution Approach 1:
The patent extracts and reports CQI values only for a selected subset of frequency intervals (e.g., best M intervals or intervals with significant changes) rather than all frequency intervals. This selective extraction reduces the quantity of reported data while maintaining essential channel information for scheduling decisions.
Solution Approach 2:
The patent applies partial action by reporting CQI for only a portion (subset) of frequency intervals rather than all intervals. This partial reporting is sufficient for the scheduler to make informed decisions about resource allocation, reducing overhead while preserving measurement precision for critical intervals.
2Quantity of substance
If CQI is averaged over frequency intervals, then signaling overhead is reduced, but channel information is destroyed
Solution Approach 1:
The patent applies local quality by reporting CQI values specifically for selected frequency intervals that exhibit particular characteristics (e.g., best channel conditions, significant variations). This localized reporting preserves the specific channel quality information for these intervals without requiring averaging, thus avoiding information loss while reducing overall signaling overhead.
3Adaptability or versatility
If CQI is reported for all frequency intervals, then scheduling flexibility is improved, but resource efficiency decreases
Solution Approach 1:
The patent performs preliminary selection of frequency intervals based on their channel quality characteristics before reporting. By pre-identifying the most relevant intervals (e.g., best M intervals or intervals with significant changes), the system prepares a condensed set of information that maintains scheduling flexibility while improving resource efficiency through reduced signaling overhead.
Data Source
AI summary
A method and corresponding receiver for transmitting channel quality data for a channel in a wireless communication system are provided. The method comprises determining channel quality metrics for frequency intervals within the channel, selecting groups of frequency intervals based on the determined metrics, and transmitting one or more channel quality indicators for the groups. The invention also provides a method of transmitting over a channel based on such channel quality indicators feedback from a receiver, and a corresponding transmitter.