Vehicle Portable Identifier UWB Triggering From BLE Approach Prediction
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Solution Overview
Problem
Existing vehicle systems with portable identifiers, such as key fobs or smartphones, face reduced battery life due to frequent BLE communication exchanges to initiate UWB communication, which is inefficient and drains the electrical energy source.
Innovation Solution
Implement a method using UWB communication within a first perimeter and BLE communication within a second perimeter, performing distance measurements and speed calculations to predict the right moment for initiating UWB communication, thereby reducing unnecessary energy consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If BLE communication is performed frequently to ensure the portable identifier is well away from the vehicle before UWB communication is initiated, then the reliability of distance verification is improved, but the energy consumption increases and reduces the life of the electrical energy source
Solution Approach 1:
The system performs preliminary BLE distance measurements while the user is approaching the vehicle (before reaching the first perimeter) to predict arrival time. This preliminary action allows the system to prepare for UWB communication initiation in advance, reducing the need for continuous BLE exchanges and thereby conserving energy while maintaining reliable distance verification.
Solution Approach 2:
The system dynamically switches between BLE and UWB communication protocols based on the user's proximity to the vehicle. BLE is used for preliminary distance measurements and prediction, while UWB is activated only when needed for precise distance verification at the optimal moment. This dynamic protocol selection optimizes energy consumption while maintaining verification reliability.
2Reliability
If UWB communication is initiated earlier to ensure proper communication establishment, then the communication reliability is improved, but the energy consumption increases due to premature activation
Solution Approach 1:
The system performs preliminary BLE measurements and speed calculations to predict the exact moment when the user will reach the optimal distance for UWB communication. This allows the system to initiate UWB communication at the precise optimal moment rather than earlier, ensuring reliable communication establishment while minimizing energy consumption by avoiding premature activation.
Solution Approach 2:
The system uses feedback from BLE distance measurements and speed calculations to determine the optimal timing for UWB communication initiation. By continuously monitoring the user's approach and predicting arrival time, the system can trigger UWB communication at the optimal moment, balancing communication reliability with energy efficiency.
3Reliability
If continuous monitoring is performed to detect user return after leaving the vehicle, then the security is improved, but the energy consumption increases
Solution Approach 1:
Instead of continuous monitoring, the system performs periodic BLE exchanges at optimized intervals to detect RSSI changes that indicate user return. This periodic approach maintains security monitoring reliability by detecting when the user comes back within range, while significantly reducing energy consumption compared to continuous monitoring by allowing the system to enter low-power states between measurement cycles.
Data Source
AI summary
A method for using a vehicle system that has stored a portable identifier is proposed. The system and the identifier are configured to communicate using a UWB communication protocol within a first perimeter around the vehicle and to communicate using a BLE communication protocol within a second perimeter that includes the first perimeter. The method comprises, while a user carrying the identifier is approaching the vehicle, detecting that the identifier is located within the second perimeter and performing two distance measurements between the user and the vehicle. The method then comprises determining a speed of the user and predicting a time remaining for the user to reach a predetermined near distance from the vehicle. After the predicted remaining time has elapsed, the method comprises initiating a communication using the UWB communication protocol. The method provides for improved use of the portable identifier.