Physical Layer Rate Mapping for Accurate Wi-Fi Client Steering
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Solution Overview
Problem
Existing wireless communication systems face issues with inaccurate 802.11k reports from client devices, leading to unreliable determination of the best access point for optimal performance, as these reports consistently misrepresent signal power levels.
Innovation Solution
A method to calibrate and utilize 802.11k reports by associating actual physical layer rates with reported power levels, generating a database or mathematical functions to correct the inaccuracies, allowing for accurate switching of communication sessions to improve network performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Extent of automation
If 802.11k reports are used to determine access point selection, then client steering can be automated, but the measurement precision of signal power levels becomes unreliable
Solution Approach 1:
The patent introduces an intermediary calibration process that mediates between the unreliable 802.11k reports and the actual signal quality. Access points perform independent signal strength measurements and physical layer rate measurements, then use these as reference standards to calibrate the client device's reported values. This intermediary calibration layer transforms the harmful inaccurate reports into useful information by mapping reported power levels to actual measured values through calibration curves or lookup tables.
Solution Approach 2:
The system implements feedback by continuously monitoring the discrepancy between reported power levels and actual measurements. Access points send calibration requests to client devices, receive reported values, compare them against independently measured signal strength and physical layer rates, and update calibration parameters accordingly. This closed-loop feedback mechanism progressively improves the accuracy of client steering decisions while maintaining automated operation.
2Measurement precision
If actual physical layer rate measurements are performed for each access point, then accurate connection quality assessment is achieved, but the time required for client steering increases
Solution Approach 1:
The patent applies preliminary action by having access points pre-measure and store signal strength and physical layer rate characteristics for different client devices during calibration phases. When steering decisions are needed, the system retrieves pre-computed calibration data and lookup tables rather than performing new measurements. This preliminary preparation dramatically reduces steering time while maintaining measurement accuracy, as the system only needs to query stored calibration curves rather than conduct full measurements.
Solution Approach 2:
The system performs partial measurements by focusing only on the essential parameters needed for steering decisions (signal strength and physical layer rate) rather than comprehensive channel characterization. During calibration, the access point performs measurements at selected signal levels rather than continuously across all possible conditions, creating efficient calibration curves that capture the essential relationship between reported and actual values without excessive measurement overhead.
3Measurement precision
If calibration data is collected and stored for multiple access points, then measurement accuracy improves, but the complexity of the system increases
Solution Approach 1:
The patent transforms the complex multi-dimensional calibration data (multiple access points, multiple client devices, multiple signal levels) into simplified parameter relationships. Instead of storing raw measurement data for every combination, the system fits calibration curves or creates lookup tables that represent the essential parameter relationships. Each calibration entry stores only the critical parameters (reported power level, actual power level, physical layer rate) and the derived calibration function, dramatically reducing data complexity while preserving measurement accuracy.
Data Source
AI summary
A wireless system includes memory configured to store information of physical layer rates associated with power levels between a client device and respective access points. The power levels comprise information of amounts of power in signals received by the client device from the respective access points. The system includes one or more processors configured to: during a communication session between the client device and a first access point, determine a current power level between the client device and a second access point, access the information based on the current power level to determine an expected physical layer rate between the client device and the second access point, determine a current physical layer rate between the client device and the first access point, and determine whether to switch the communication session to the second access point based on the expected physical layer rate and the current physical layer rate.