Subband Feedback Reporting for Wireless Channel Adaptability
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Solution Overview
Problem
Conventional LTE standards, such as PUSCH reporting Mode 2-2, do not allow for feedback information on an individual subband basis, reducing flexibility and quality of data communications over wireless channels.
Innovation Solution
A mobile station determines if a predefined condition is satisfied, sending individual subband feedback information if met, otherwise sending aggregate feedback information, allowing for incremental reporting of channel quality indicators (CQI) and precoding matrix indicators (PMI) on a subband basis.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If aggregate feedback information is sent for all subbands, then feedback overhead is reduced, but communication flexibility and quality are degraded
Solution Approach 1:
The patent segments feedback information by introducing a subband indicator that identifies specific subbands for which feedback is being provided. This allows the system to transition from aggregate feedback covering all subbands to segmented feedback covering only selected subbands, thereby improving feedback information granularity while maintaining manageable reporting complexity through structured segmentation.
2Adaptability or versatility
If individual subband feedback is provided, then communication quality and flexibility are improved, but feedback overhead and reporting complexity increase
Solution Approach 1:
The patent applies local quality by providing feedback at the subband level rather than uniformly for all subbands. The subband indicator enables the system to selectively provide detailed feedback only for specific subbands where it is most needed, while other subbands can rely on aggregate or default feedback. This localized approach improves communication adaptability for critical subbands without proportionally increasing overall feedback data volume.
3Productivity
If feedback overhead is minimized, then reporting efficiency is improved, but individual subband optimization is lost
Solution Approach 1:
The patent introduces dynamic feedback reporting through the subband indicator, which enables the system to adaptively select which subbands require detailed feedback based on current channel conditions. This dynamic approach allows the system to maintain high reporting efficiency by providing detailed feedback only when and where necessary, while preserving measurement precision for selected subbands through targeted individual feedback reporting.
Data Source
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AI summary
To report feedback information regarding a wireless channel, a mobile station determines whether a predefined condition is satisfied. In response to determining that the predefined condition is satisfied, feedback information regarding an individual one of plural subbands of the wireless channel is included in a first report to be sent to a base station. In response to determining that the predefined condition is not satisfied, aggregate feedback information regarding the plural subbands is included in a second report to be sent to the base station.