Adaptive CQI Modulation for Channel Quality Feedback
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Solution Overview
Problem
In mobile communications networks, sending channel quality information from mobile stations to base stations consumes frequency and time dimension sub-channels, limiting the number of active users that can be supported, as more sub-channels allocated for channel information reduce capacity for other user devices.
Innovation Solution
Implementing a method that sends Channel Quality Indicators (CQI) in both x-bit and y-bit modulation schemes, with the y-bit scheme used until a trigger event necessitates switching to the x-bit scheme, optimizing channel allocation by reallocating CQI channels based on channel stability and bit error rate, allowing efficient use of resources.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If more sub-channels are allocated to send channel information from MS to BS, then channel quality feedback accuracy is improved, but the total number of active users that can be supported decreases
Solution Approach 1:
The patent applies parameter changes by switching between different modulation schemes (x-bit and y-bit) for CQI transmission. The system dynamically adjusts the modulation scheme based on channel conditions and feedback requirements, allowing the base station to receive accurate channel quality information while using fewer sub-channels, thus supporting more active users simultaneously
Solution Approach 2:
The patent implements dynamics by making the CQI transmission adaptive rather than static. The mobile station switches between x-bit and y-bit modulation schemes based on real-time channel conditions and feedback triggers, optimizing the balance between feedback accuracy and spectral efficiency to support more users
2Measurement precision
If x-bit modulation scheme is used for CQI transmission, then channel quality information accuracy is improved, but frequency and time dimension sub-channel resources are consumed
Solution Approach 1:
The patent applies partial action by using the higher x-bit modulation scheme only when necessary (e.g., when trigger events occur or channel conditions require it), rather than continuously. The system uses the more efficient y-bit scheme for normal conditions, consuming fewer sub-channel resources while maintaining accuracy when needed
Solution Approach 2:
The system dynamically changes the modulation scheme parameter based on channel conditions and feedback requirements, switching between x-bit and y-bit schemes to optimize the balance between CQI accuracy and sub-channel resource consumption
Data Source
AI summary
The present invention relates to a method, a computer readable medium, and a system of payload encoding and modulation and, more particularly, to a method, a computer readable medium, and a system of payload encoding and modulation for channel quality feedback. A method includes sending a Channel Quality Indicator (CQI) in a x-bit modulation scheme, and after sending the CQI, sending at least one CQI in a y-bit modulation scheme, the at least one CQI indicating one of an increment and a decrement of a previous CQI. The method further includes detecting a trigger event, and when the trigger event is detected, sending the CQI in the x-bit modulation scheme.