Dynamic 802.11ax ER Settings for Link Stability
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Solution Overview
Problem
The IEEE 802.11ax standard's static extended range (ER) PHY mode settings do not adapt dynamically to varying environmental conditions, leading to potential performance degradation due to incorrect modulation and coding scheme selection and excessive overhead, especially in outdoor environments where link reliability is critical.
Innovation Solution
A network controller dynamically configures ER settings for wireless client devices by calculating a conservativeness scaling factor based on parameters like frame transmission airtime, distance, deployment type, and packet error rates, then adjusts the guard interval and enables ER mode as needed to enhance link reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If static ER PHY mode settings are used, then device complexity is reduced, but link reliability deteriorates in varying environmental conditions
Solution Approach 1:
The patent implements dynamic ER settings where the access point continuously monitors packet error rates and adjusts ER mode configuration in real-time based on current channel conditions. This transforms the static configuration into a dynamic system that adapts to environmental changes, resolving the contradiction between simplicity and reliability.
Solution Approach 2:
The system establishes a feedback loop where packet error rate measurements are continuously collected and used to adjust ER settings. The access point monitors link quality and modifies conservation scaling factors and guard intervals based on observed performance, creating a closed-loop control system that maintains reliability without excessive complexity.
2Reliability
If ER mode is enabled with repeated HE-LTF and extended guard intervals, then link reliability is improved, but transmission overhead increases
Solution Approach 1:
The patent dynamically adjusts ER parameters including conservation scaling factors, guard interval lengths, and HE-LTF repetition counts based on measured packet error rates. By changing these parameters in response to actual channel conditions rather than using fixed settings, the system achieves reliable transmission with minimized overhead.
Solution Approach 2:
The system applies ER mode enhancements selectively rather than universally. Based on packet error rate thresholds, the access point determines the appropriate level of ER configuration needed, applying only the necessary degree of repetition and guard interval extension to achieve reliability without unnecessary overhead.
3Device complexity
If incorrect modulation and coding scheme is selected, then device complexity is reduced, but performance deteriorates due to inability to adapt to channel conditions
Solution Approach 1:
The system uses packet error rate feedback to inform MCS selection and ER configuration decisions. By monitoring transmission success and failure rates, the access point adapts its modulation and coding scheme choices to current channel conditions, maintaining performance without complex predictive algorithms.
Data Source
AI summary
A method includes obtaining configuration parameters of wireless client devices served by an access point in a wireless local area network basic service set; calculating a conservativeness scaling factor for a first wireless client device in the basic service set based on the configuration parameters; determining a new guard interval of an orthogonal frequency division multiplexed symbol for the first wireless client device based on the conservativeness scaling factor; and replacing an old guard interval for the first wireless client device with the new guard interval.