Mobile Access Control Ranging Using Bluetooth and UWB
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Solution Overview
Problem
Existing systems face challenges in accurately determining the distance between a mobile device and a vehicle for secure access control, as standard communication protocols like Bluetooth are not suitable for precise distance measurements, leading to difficulties in timely and secure unlocking or other vehicle operations.
Innovation Solution
The method employs a dual wireless protocol approach, using Bluetooth for authentication and ultra-wideband (UWB) for accurate distance measurements, with narrower pulses allowing for better time-of-flight calculations and secure key exchanges, enabling precise distance determination and secure access control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If Bluetooth protocol is used for communication between mobile device and vehicle, then authentication and connectivity are achieved, but distance measurement precision is insufficient
Solution Approach 1:
The communication system is segmented into two distinct protocols: Bluetooth for authentication and connectivity management, and UWB for precise distance measurement. This segmentation allows each protocol to optimize its specific function without compromise, achieving both ease of operation and measurement precision
Solution Approach 2:
The patent introduces UWB technology as an intermediary component specifically for distance measurement purposes. This intermediary enables accurate ranging while Bluetooth handles the authentication and control functions, resolving the contradiction between measurement precision and system complexity
2Measurement precision
If UWB protocol is used for distance measurement, then accurate distance determination is achieved, but system complexity increases
Solution Approach 1:
The patent merges two wireless protocols (Bluetooth and UWB) into a unified access control system where each protocol serves its optimal function. Bluetooth handles authentication and basic communication, while UWB provides precise distance measurement, together achieving secure and accurate access control without requiring a single complex protocol to do everything
3Measurement precision
If standard communication protocols are used, then ease of operation is maintained, but accurate distance measurement for secure access control cannot be achieved
Solution Approach 1:
The system automatically performs authentication via Bluetooth and distance measurement via UWB without requiring user intervention to switch protocols or configurations. The mobile device and vehicle system handle the protocol coordination automatically, maintaining ease of operation while achieving accurate distance measurement for secure access control
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 solution provides accurate and secure distance-based access control, allowing for timely and secure vehicle operations, such as unlocking, by leveraging the precision of UWB while maintaining secure communication through Bluetooth authentication.
Implementation Method 1
using a second wireless protocol with narrower pulses than pulses used by the first wireless protocol to transmit a set of timestamps
Data Source
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AI summary
Two different wireless protocols can be used for ranging between a mobile device and an access control system (e.g., a vehicle). The first wireless protocol (e.g., Bluetooth®) can be used to perform authentication of the vehicle and exchange ranging capabilities between a mobile device (e.g., a phone or watch, 910) and the vehicle. The second wireless protocol (e.g., ultra-wideband, UWB) can use a pulse width that is less than a pulse width used by the first wireless protocol (e.g., 1 ns v. 1 M S, 940). The narrower pulse width can provide greater accuracy for distance (ranging) measurements.