UWB Device Location With Multiple Transit-Gate Ranging Rounds
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Solution Overview
Problem
Conventional UWB communication methods limit data transfer and ranging processes to a single phase, requiring UWB-enabled devices to sacrifice data transfer slots for double-sided two-way ranging, increasing transaction time.
Innovation Solution
Implementing multiple ranging processes or rounds during data transfer, utilizing double-sided two-way ranging (DS-TWR) with flexible slot allocation, allowing UWB-enabled devices to participate in ranging rounds without data transfer requirements, and using implicit slot locations for ranging frames.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single phase is used for both data transfer and ranging, then device complexity is reduced, but measurement precision and security are compromised
Solution Approach 1:
The patent segments the communication process into multiple phases: an initial phase for device discovery and authentication, and a second phase for simultaneous data transfer and multiple ranging rounds. This segmentation allows each phase to be optimized for its specific purpose, with the second phase performing multiple distance measurements to improve location accuracy while maintaining security.
2Measurement precision
If multiple ranging rounds are performed during data transfer, then measurement precision and security are improved, but transaction time increases
Solution Approach 1:
The patent merges data transfer and ranging operations into the same time slots during the second phase. By combining these functions that were traditionally performed separately, the system achieves multiple distance measurements without proportionally increasing transaction time, as data transfer and ranging share the same communication resources.
Solution Approach 2:
The patent implements continuous ranging and data transfer operations throughout the second phase without idle periods. The system maintains uninterrupted communication streams, ensuring that each time slot is fully utilized for both data transfer and distance measurements, thereby minimizing overall transaction time while achieving multiple measurements.
3Measurement precision
If UWB-enabled devices must sacrifice data transfer slots for ranging, then measurement precision is improved, but productivity decreases
Solution Approach 1:
The patent makes communication slots universal by enabling them to serve dual purposes: data transfer and ranging measurements. During the second phase, the same time slots perform both functions simultaneously, eliminating the need to sacrifice data transfer slots for ranging and thereby maintaining productivity while achieving measurement precision.
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
Enhances security and precision in data transfer by allowing simultaneous multiple distance measurements, reducing transaction time to approximately 300 ms, and ensuring precise location of UWB-enabled devices during transactions.
Implementation Method 1
performing multiple distance measurements between the transit gate and the UWB enabled device during the data transfer process
Data Source
AI summary
A method of locating a UWB enabled mobile device in a UWB based transit deployment is disclosed. Performed is a data transfer process within a specified proximity between the UWB enabled device and anchors of a transit gate (G1 . . . Gn), wherein multiple distance measurements (RS1 . . . RSn) are performed between the transit gate (G1 . . . Gn) and the UWB enabled device during the data transfer process. Multiple ranging processes or ranging rounds during the data transfer phase are carried out in this way. The multiple ranging processes support improved security as regards data transfer between UWB enabled mobile device and transit gate.