WLAN Fast Feedback Mechanism for Ultra-High Reliability Link Adaptation
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Solution Overview
Problem
Existing WLAN link adaptation methods are inadequate for ultra-high reliability (UHR) wireless communications due to in-device interference, varying interference levels across subchannels, and limitations in reporting communication quality, which affects the accuracy of link adaptation parameters.
Innovation Solution
The implementation of fast feedback (FB) contents, including a feedback sequence number (FBSN) and FB data, allows receiving devices to provide timely and accurate link adaptation parameters to transmitting devices, enabling quick adjustments in transmission settings to improve communication quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional WLAN link adaptation methods are used, then device complexity is reduced, but reliability deteriorates due to in-device interference and inaccurate quality reporting
Solution Approach 1:
The patent segments the feedback mechanism into distinct components: FBSN for sequence tracking, FB data for quality metrics, and specific feedback types (ACK/NACK/CTT) for different reception outcomes. This structured segmentation enables reliable quality reporting while maintaining manageable device complexity through standardized processing of each feedback element.
Solution Approach 2:
The patent implements a comprehensive feedback mechanism where the receiving device sends detailed feedback (FB data) including signal quality metrics, interference characteristics, and reception status to the transmitting device. This feedback loop enables the transmitting device to adjust link adaptation parameters dynamically, improving reliability despite the increased complexity of the feedback mechanism.
2Measurement precision
If fast feedback contents are implemented for accurate link adaptation, then communication quality improves, but loss of time in feedback transmission occurs
Solution Approach 1:
The patent incorporates link adaptation parameters and feedback information into the preamble of the PPDU before transmission. The transmitting device prepares and sends these parameters in advance, allowing the receiving device to have measurement precision requirements met while reducing feedback transmission time since the initial parameters are already provided proactively in the preamble.
3Measurement precision
If comprehensive feedback data is transmitted for each PPDU, then link adaptation precision improves, but productivity decreases due to increased overhead
Solution Approach 1:
The patent uses a universal feedback framework where a single feedback mechanism handles multiple communication scenarios including ACK for successful reception, NACK for failed reception, and CTT for capacity feedback. This multi-functional approach enables comprehensive quality measurement across different situations while maintaining productivity by avoiding separate feedback mechanisms for each scenario, thus reducing overall overhead.
Data Source
AI summary
Some aspects of this disclosure include an apparatus, method, and computer program product for wireless local area network (WLAN) link adaptation. Some aspects of this disclosure include fast feedback (FB) contents to improve WLAN link adaptation that can address the challenges of ultra-high reliability (UHR) wireless communications. Fast FB contents can include a feedback sequence number (FBSN) that identifies a reference packet and FB data corresponding to the receipt of the reference packet by the receiving device. The FB data can include link adaptation parameters corresponding to the receiving device that the transmitting device can use to adjust (e.g., adapt) subsequent transmissions to the same receiving device. Some aspects include an indicator that informs a receiving device whether to provide a Negative Acknowledgement (NACK) frame (e.g., control packets) with FB contents or not.