UWB Ranging Anchor Selection via Clock Accuracy Thresholds
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Solution Overview
Problem
Current wireless communication systems, particularly in 5G NR, face challenges in improving the accuracy and reliability of ultra-wideband (UWB) ranging sessions, including anchor capability, cluster formation, and anchor selection based on clock stability and location confidence.
Innovation Solution
The proposed solution involves an apparatus that receives a response message from a second wireless device, including clock accuracy and location confidence values, and establishes a ranging session based on these values exceeding predetermined thresholds, thereby selecting suitable anchors for UWB sessions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If UWB ranging sessions are established without verifying clock accuracy and location confidence, then the device complexity and operation simplicity are maintained, but the positioning accuracy and reliability deteriorate
Solution Approach 1:
The patent applies preliminary action by requiring wireless devices to report their clock accuracy values and location confidence values before establishing a ranging session. The first wireless device evaluates these reported parameters in advance to determine whether to proceed with the ranging session, ensuring that only devices meeting minimum quality thresholds are selected as anchors. This pre-screening mechanism improves positioning accuracy while maintaining operational simplicity through automated threshold-based decisions.
2Reliability
If anchors are selected without evaluating clock stability, then the operation speed and ease of selection are maintained, but the ranging accuracy and reliability worsen
Solution Approach 1:
The patent implements feedback by having wireless devices report their clock accuracy values to potential anchor devices. The first wireless device uses this feedback information to evaluate and select anchors that meet predetermined clock accuracy thresholds. This feedback mechanism ensures that only reliable anchors with stable clocks are selected for ranging sessions, improving ranging session reliability while maintaining ease of operation through automated threshold-based selection.
3Measurement precision
If all wireless devices are used as potential anchors, then the quantity of available anchors is maximized, but the positioning accuracy deteriorates due to inclusion of devices with poor clock stability
Solution Approach 1:
The patent applies local quality by differentiating between wireless devices based on their individual clock accuracy characteristics. Instead of treating all devices uniformly, the system evaluates each device's reported clock accuracy value and location confidence value against predetermined thresholds. Devices that meet the quality thresholds are selected as anchors, while those that do not meet the thresholds are excluded. This selective approach ensures high positioning accuracy by ensuring that only devices with sufficient clock stability and location confidence serve as anchors.
Data Source
AI summary
Aspects presented herein may improve the efficiency and accuracy of ranging operations, such as ranging operations based on ultra-wideband or sidelink. In one aspect, a first wireless device receives a response message from at least one second wireless device, the response message including a clock accuracy value of the at least one second wireless device, a location confidence value of the at least one second wireless device, or a combination thereof. The first wireless device establishes a ranging session with the at least one second wireless device based on the clock accuracy value of the at least one second wireless device exceeding a clock accuracy threshold, or the location confidence value of the at least one second wireless device exceeding a location confidence threshold, or both.