Transmission Control Frame Generation Reducing Feedback Overhead
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Solution Overview
Problem
In adaptive transmission control for multicarrier transmission schemes, the amount of data for feedback information increases with the number of subcarriers, leading to overhead issues, and setting large subcarrier blocks requires additional identification information, increasing data throughput challenges.
Innovation Solution
A configuration that calculates a reference channel state level between subcarriers and sets a group channel state level, generating a frame indicating these values to control transmission, reducing the need for individual subcarrier feedback and identification information.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the number of subcarriers is increased to maintain high data throughput, then the data rate is improved, but the amount of feedback information increases leading to overhead issues
Solution Approach 1:
The patent merges adjacent subcarriers into subcarrier blocks and represents their channel state information collectively. Instead of feeding back individual CSI for each subcarrier, the system calculates average received power and differential values for blocks of subcarriers, significantly reducing feedback overhead while maintaining adequate channel state representation for adaptive transmission control.
Solution Approach 2:
The patent segments the entire subcarrier set into multiple subcarrier blocks with varying block sizes. This segmentation allows the system to group subcarriers with similar channel characteristics together, representing each block with aggregated metrics (average received power and differential values) rather than individual subcarrier measurements, thus reducing feedback information quantity.
2Quantity of substance
If large subcarrier blocks are used to reduce feedback information, then the amount of feedback data is reduced, but additional identification information is required increasing complexity
Solution Approach 1:
The patent extracts only the essential channel state characteristics (average received power and differential values) from each subcarrier block, discarding redundant individual subcarrier information. This extraction approach reduces feedback to core metrics that capture block-level channel conditions without requiring detailed identification information for each subcarrier within the block.
Solution Approach 2:
The patent changes the representation parameters from individual subcarrier CSI to block-level aggregated parameters (average received power and differential values). This parameter transformation reduces the dimensionality of feedback information while preserving the essential channel state characteristics needed for adaptive transmission control, eliminating the need for extensive identification information.
3Measurement precision
If individual subcarrier CSI is fed back for each subcarrier, then measurement precision is improved, but the overhead of feedback information increases
Solution Approach 1:
The patent combines multiple subcarrier measurements into aggregated block-level metrics. By calculating average received power and differential values across subcarrier blocks, the system maintains sufficient channel state accuracy for adaptive transmission control while reducing feedback overhead through the merging of individual subcarrier information into representative block characteristics.
Data Source
AI summary
There is provided a transmission control frame generation device capable of reducing the data amount of feedback information while maintaining a high throughput. In this device, an average quality level calculation unit (182) calculates an average SNR value of a plurality of sub-carriers from a plurality of SNR values corresponding to the plurality of sub-carriers. According to an SNR value corresponding to one of the sub-carriers and the average SNR value, a sub-carrier block configuration unit (185) sets the SNR value of the sub-carrier block containing the sub-carrier. A feedback frame generation unit (187) generates a CSI frame used for controlling transmission in the sub-carrier and indicating the value representing the average SNR value and the value representing the SNR value of the sub-carrier block.