Dynamic RTT Measurement Frequency for Indoor Positioning Accuracy
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Solution Overview
Problem
Network-based positioning systems face inaccuracies and inconsistencies in location estimation due to variability in Round Trip Time (RTT) measurements, especially when mobile stations are moving at speeds above a certain threshold, and differences in AP chipset characteristics.
Innovation Solution
Increasing the frequency of RTT measurements when the mobile station's speed does not exceed a threshold and using statistical techniques to estimate and compensate for variability in RTT values, thereby improving the reliability and accuracy of location estimates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the frequency of RTT measurements is increased to improve location estimation accuracy, then measurement precision is improved, but energy consumption increases
Solution Approach 1:
The patent dynamically adjusts the measurement frequency based on the mobile station's speed. When the MS is moving (speed exceeds threshold), RTT measurements are performed at a lower frequency to conserve energy. When the MS is stationary or moving slowly (speed at or below threshold), measurements are performed at a higher frequency to improve location estimation accuracy. This dynamic adaptation resolves the contradiction between measurement precision and energy consumption.
Solution Approach 2:
The system changes the parameter of measurement frequency based on the speed condition of the mobile station. By monitoring the speed parameter and adjusting the RTT measurement frequency accordingly, the system optimizes the balance between location accuracy and energy consumption, performing measurements more frequently only when necessary for accurate positioning.
2Reliability
If RTT measurements are performed at high frequency to reduce variability impact, then reliability is improved, but loss of time increases
Solution Approach 1:
The patent implements dynamic measurement frequency adjustment based on mobile station speed. During periods when the MS is stationary or moving slowly, the system increases RTT measurement frequency to gather more data points and reduce variability impact, thereby improving reliability. During periods of high speed movement, the system reduces measurement frequency to minimize time loss, accepting that reliability requirements are lower during rapid movement.
3Productivity
If motion detection is used to adjust measurement frequency, then productivity is improved, but device complexity increases
Solution Approach 1:
The system uses the mobile station's own motion detection capabilities (already present in modern devices) to automatically adjust RTT measurement frequency. The MS monitors its own speed and reports this information to the network, which then autonomously adjusts the measurement schedule. This self-service approach improves positioning efficiency without requiring complex external control systems, as the existing sensor data is leveraged for intelligent resource management.
Data Source
AI summary
Systems, apparatus and methods disclosed herein utilize motion detection to estimate variability of positioning related metrics. In some embodiments, a method may comprise obtaining the speeds of a plurality of mobile stations in a set of mobile stations connected to an AP in a wireless network. The frequency of Round Trip Time (RTT) measurements between a mobile station in the plurality of mobile stations and the AP is increased during periods when the speed of the mobile station does not exceed a threshold. An estimate of variability may be obtained for RTT measurements for the AP.