Mobile Access Point Detection for Accurate UE Location
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Solution Overview
Problem
Conventional location determination techniques for user equipment (UE) are unreliable and inaccurate when using mobile access points (APs), as they rely on the known locations of stationary APs, and fail to account for AP mobility, leading to inaccuracies in positioning.
Innovation Solution
A method on UE to obtain measurements from multiple APs, determine which APs are mobile by analyzing range rate measurements, and exclude measurements from mobile APs to calculate a more accurate location, using techniques such as RTT, Doppler frequency shift, and RSSI to assess AP mobility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If conventional location determination techniques use known locations of Access Points (APs) to determine UE position, then the location determination process is simple, but the accuracy and reliability deteriorate when APs are mobile
Solution Approach 1:
The system performs preliminary detection of AP mobility status before using AP locations for UE positioning. By measuring range rates and determining whether APs are mobile in advance, the system prevents using unreliable mobile AP data, thereby maintaining positioning accuracy without complicating the overall process
Solution Approach 2:
The invention extracts and identifies mobile APs from the set of all detected APs by analyzing range rate measurements. Mobile APs are separated and excluded from the positioning calculation, leaving only stationary APs to be used for accurate location determination
2Quantity of substance
If measurements from all detected APs are used for location determination, then the quantity of measurements increases, but the reliability deteriorates due to inclusion of mobile AP measurements
Solution Approach 1:
Before using AP measurements for positioning, the system performs preliminary mobility detection on each AP by measuring range rates over time. This preliminary action identifies which APs are mobile, allowing the system to filter them out before the actual location calculation, ensuring only reliable stationary AP measurements are used
Solution Approach 2:
The system extracts mobile AP measurements from the complete set of AP measurements by comparing range rate variations against mobility thresholds. These extracted mobile AP measurements are then excluded from the positioning calculation, maintaining reliability while preserving the benefits of having multiple stationary AP measurements
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach enhances the accuracy and reliability of UE location determination by filtering out measurements from mobile APs, thereby improving positioning accuracy and reducing errors caused by mobile APs.
Implementation Method 1
obtain measurements from a plurality of APs; determining, based on the measurements, that at least one AP of the plurality of APs is mobile
Data Source
AI summary
Measurements from a plurality of Access Points (APs) may be used to determine that at least one AP in the plurality is mobile. Measurements from APs determined to be mobile may be excluded when determining a User Equipment (UE) location. Disclosed embodiments also pertain to AP mobility characterization. AP mobility may be determined based on range rate measurements such as Round Trip Time measurements between the AP and UE; or a Doppler frequency shift relative to a nominal frequency used by the AP for transmissions. Based on range rate measurements, a probability of mobility may be assigned to APs. Information pertaining to APs that are determined to be stationary or associated with a low probability of mobility may be reported to a location server. Information pertaining to APs determined to be mobile or associated with a higher probability of mobility may not be reported to a location server.