Vehicle BLE Security Control With Range-to-Bandwidth Switching
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The existing Bluetooth Low Energy (BLE) communication between a motor vehicle and a mobile device is limited in range, leading to delayed authentication and potential inability to use the vehicle when the user approaches.
Innovation Solution
A method that switches the communication connection from Bluetooth Low Energy Long Range Mode to Normal Mode when the distance between the motor vehicle and the mobile device is below a predetermined threshold, thereby increasing the available bandwidth for communication.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of stationary object
If Bluetooth Low Energy Long Range Mode is used, then communication range is extended, but available bandwidth is reduced
Solution Approach 1:
The system dynamically switches between BLE Long Range Mode and Normal Mode based on the detected distance between mobile device and motor vehicle. When distance exceeds threshold, Long Range Mode is used to extend communication range; when distance is below threshold, Normal Mode is used to maximize bandwidth. This dynamic adaptation resolves the contradiction by allowing the system to optimize for range or bandwidth depending on real-time conditions.
Solution Approach 2:
The system changes the operational parameters of the BLE communication by switching between two distinct modes with different characteristic settings. Long Range Mode uses parameters optimized for extended distance (lower data rate, higher robustness), while Normal Mode uses parameters optimized for high throughput (higher data rate, shorter range). This parameter switching enables the system to resolve the bandwidth-range tradeoff.
2Productivity
If Bluetooth Low Energy Normal Mode is used, then available bandwidth is increased, but communication range is reduced
Solution Approach 1:
The system employs dynamic mode switching based on real-time distance measurement. When the mobile device approaches within threshold distance, the system transitions to Normal Mode to utilize the higher bandwidth capability. This dynamic adjustment ensures that Normal Mode is only activated when the shorter range is acceptable, thus resolving the contradiction between bandwidth and range.
Solution Approach 2:
The system performs preliminary distance determination using channel sounding before activating Normal Mode. This preliminary action ensures that the transition to high-bandwidth mode only occurs when the mobile device is sufficiently close, preventing connection loss due to exceeding Normal Mode's limited range.
3Length of stationary object
If transmission power is increased to extend communication distance, then communication range is extended, but transmission power consumption increases
Solution Approach 1:
Instead of increasing transmission power, the system changes the BLE operational mode parameter to Long Range Mode, which extends communication distance through protocol-level adjustments (forward error correction, lower data rate) rather than power increases. This resolves the contradiction by achieving extended range through parameter optimization rather than power consumption.
Data Source
AI summary
A method for controlling a security function of a motor vehicle includes the steps of making a communication connection between the motor vehicle and a mobile device via Bluetooth Low Energy Long Range; determining a distance between the motor vehicle and the mobile device via channel sounding on the communication connection; and changing the communication connection to Bluetooth Low Energy Normal Mode when the distance is below a predetermined threshold.