UWB Mobile Device Localization With Time-Offset Gate Groups
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Solution Overview
Problem
Existing UWB-based transit deployments for locating UWB-enabled mobile devices are expensive and consume excessive power due to the need for DL-TDoA infrastructure, which is costly and inefficient for stations with varying numbers of transit gates.
Innovation Solution
A method that schedules UWB communication sessions in groups of transit gates with different time offsets, allowing UWB-enabled mobile devices to select appropriate groups for transactions without user involvement, reducing the need for DL-TDoA infrastructure and optimizing power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If DL-TDoA infrastructure is deployed for UWB-based transit localization, then location accuracy is improved, but deployment cost and device power consumption increase
Solution Approach 1:
The patent segments the UWB communication sessions into different groups with different time offsets. Instead of requiring all transit gates to simultaneously participate in DL-TDoA infrastructure, the system divides them into multiple groups that operate at different time intervals. This segmentation allows location tracking without requiring continuous, full-scale DL-TDoA infrastructure deployment, thereby reducing both deployment costs and power consumption while maintaining location accuracy through selective group participation.
Solution Approach 2:
The patent implements periodic action by scheduling UWB communication sessions in groups with different time offsets. Transit gates are organized into multiple groups that communicate with mobile devices at different time intervals rather than simultaneously. This periodic scheduling approach enables the system to achieve location tracking functionality without requiring continuous operation of all gates, thus reducing overall power consumption and infrastructure deployment requirements while preserving measurement precision through regular periodic updates.
2Measurement precision
If DL-TDoA infrastructure is deployed for UWB-based transit localization, then location accuracy is improved, but deployment cost increases
Solution Approach 1:
The patent applies segmentation by dividing the transit gate infrastructure into multiple groups that operate at different time offsets. This allows the system to achieve location accuracy without deploying complete DL-TDoA infrastructure across all gates simultaneously. By segmenting the infrastructure into manageable groups that can be deployed and operated independently, the patent reduces the overall deployment complexity and cost while maintaining the necessary measurement precision through coordinated group operations.
Solution Approach 2:
The patent uses periodic action by implementing time-offset scheduling for different gate groups. Instead of requiring continuous, simultaneous operation of all infrastructure elements, the system periodically activates different groups of gates at different time offsets. This periodic approach reduces deployment complexity by allowing incremental infrastructure rollout and reduces costs by avoiding the need for all gates to operate continuously at full DL-TDoA capability, while still achieving accurate location measurements through the periodic updates.
3Productivity
If all transit gates communicate simultaneously with UWB-enabled mobile devices, then localization efficiency is improved, but power consumption and system complexity increase
Solution Approach 1:
The patent segments the simultaneous communication requirement into multiple time-offset groups. Instead of all transit gates communicating with mobile devices at the same time, the system divides gates into groups that communicate sequentially at different time offsets. This segmentation maintains localization efficiency by ensuring that sufficient gates are active at any given time to perform trilateration, while significantly reducing the power consumption of individual gates and the overall system by avoiding simultaneous full-scale communication operations.
4Measurement precision
If DL-TDoA infrastructure is deployed, then location tracking capability is improved, but adaptability to varying gate configurations is reduced
Solution Approach 1:
The patent applies dynamics by implementing a flexible, time-offset-based grouping system that can adapt to varying gate configurations. Instead of a fixed DL-TDoA infrastructure requirement, the system dynamically organizes gates into groups that can be configured based on the actual deployment scenario. This dynamic approach allows the system to maintain location tracking capability while adapting to different numbers and arrangements of transit gates, thereby improving versatility without sacrificing 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
This approach reduces deployment costs and power consumption by enabling scalable, flexible, and efficient localization of UWB-enabled mobile devices in transit environments with varying gate configurations.
Implementation Method 1
distance measurements are performed during UWB communication sessions referred to as ranging sessions. A typical UWB-based ranging session includes one or more messages (i.e. frames that are part of a distance estimation sequence) transmitted from a UWB communication device to one or more other UWB communication devices, as well as one or more messages in response to those frames, which are transmitted back to the communication device
Data Source
AI summary
A method of locating a UWB enabled mobile device in a UWB based transit deployment is disclosed. The method implements a trilateration procedure between three known anchor positions of transit gates and implements position determination based on determination of distance values between three of the transit gates and an ultra-wideband (UWB) device. In effect, by means of the anchors a maximal amount of mobile devices can be recognized. Thus, a scalable transit scenario is implemented without needing additional anchor infrastructure. A discovery process is implemented, in which user are recognized in order to pay via fare transaction. The whole process of discovery, gate selection und fare transaction is thus possible without DL-TDoA infrastructure. In this way, advantageously, DL-TDoA infrastructure can be saved to a maximum extent. A following fare transaction can be carried out as defined by a transit provider.