Multicarrier Channel Quality Reporting for Adaptive Scheduling
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Solution Overview
Problem
Conventional multicarrier communication systems face inefficiencies in adaptive modulation and scheduling due to excessive reception quality information transmission, leading to suboptimal transmission rates and error characteristics, particularly when channels with varying reception quality are not accurately represented.
Innovation Solution
A communication apparatus that measures reception quality for each subcarrier and adjusts the information amount based on allocation request degrees, generating reception quality information to efficiently perform adaptive modulation and scheduling while minimizing total information transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If reception quality information for all channels is transmitted with high detail, then channel allocation accuracy is improved, but uplink information overhead increases enormously
Solution Approach 1:
The patent applies local quality by transmitting detailed reception quality information only for selected priority channels (first through fourth priority levels) while transmitting compressed or differential information for other channels. This allows the system to maintain high measurement precision for channels that matter most while reducing overall information overhead significantly.
Solution Approach 2:
The patent segments reception quality information transmission into different priority levels (first, second, third, fourth priority channels). Each segment is handled differently - high-priority channels receive full detailed reporting while lower-priority channels use compressed representations, thereby resolving the contradiction between accuracy and overhead.
2Productivity
If adaptive modulation is performed for each channel based on detailed reception quality, then transmission efficiency is improved, but system complexity increases
Solution Approach 1:
The patent implements adaptive modulation selectively - detailed adaptive modulation based on full reception quality information is applied to high-priority channels (first and second priority), while simplified adaptive modulation using compressed information is applied to lower-priority channels (third and fourth priority). This maintains high transmission efficiency where needed while controlling system complexity.
3Productivity
If scheduling allocates channels based on comprehensive reception quality data, then channel allocation optimality is improved, but processing overhead increases
Solution Approach 1:
The patent segments the scheduling process by priority levels. The scheduler first allocates high-priority channels (first and second priority) using comprehensive reception quality data for optimal allocation, then allocates lower-priority channels (third and fourth priority) using compressed information. This segmentation maintains allocation optimality for critical channels while reducing processing overhead overall.
Data Source
AI summary
To efficiently perform adaptive modulation and adaptive scheduling in a communication control apparatus, while suppressing the total notified amount of reception quality information, provided is a communication terminal apparatus 300 which is applied to a multicarrier communication scheme in which the apparatus receives a signal on a channel allocated by a communicating party among a plurality of channels each comprised of at least one subcarrier, measures reception quality of the received signal, and notifies the communicating party of reception quality information, and has a reception quality measuring section 308 that measures reception quality of each subcarrier, and a reception quality information generating section 309 which determines an allocation request degree of each channel with respect to the communicating party, selects an information amount to represent reception quality information for each channel based on the allocation request degree, and based on the measured reception quality, generates the reception quality information represented by the selected information amount.