Bluetooth Channel Sounding for Distance-Based Device Locking
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Solution Overview
Problem
Existing methods for locking electronic devices, such as laptops, are unreliable due to inaccuracies in determining distance using Received Signal Strength Indication (RSSI), leading to potential security compromises when devices are left unattended.
Innovation Solution
Utilizing Bluetooth Low Energy (BLE) Channel Sounding to determine the distance between paired electronic devices, such as a laptop and a smartphone, to automatically lock the device when the second device exceeds a predetermined threshold, combined with motion detection to initiate the sounding process and prevent excessive lock-unlock cycles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If RSSI is used to determine distance for device locking, then the locking mechanism can be implemented, but the measurement precision is insufficient leading to false positives and negatives
Solution Approach 1:
The patent changes the measurement parameter from RSSI (signal strength) to Channel Sounding (channel impulse response analysis). This parameter change enables accurate distance measurement by analyzing the time of flight and multipath characteristics of Bluetooth signals, thereby eliminating false positives and negatives in device locking while maintaining high reliability
2Reliability
If continuous monitoring is performed to ensure security, then security is improved, but energy consumption increases
Solution Approach 1:
The patent implements periodic Channel Sounding monitoring instead of continuous monitoring. The system performs distance measurements at scheduled intervals or when motion is detected, which maintains security reliability while significantly reducing energy consumption compared to continuous monitoring approaches
3Reliability
If automatic locking is implemented based on distance, then security is enhanced, but false locking events occur due to inaccurate distance detection
Solution Approach 1:
The patent changes from RSSI-based distance estimation to Channel Sounding-based distance measurement. This parameter change provides accurate distance detection that truly reflects physical proximity, eliminating false locking events while maintaining security enhancement and user convenience
Data Source
AI summary
A method provides techniques for device locking using Bluetooth Low Energy Channel Sounding. The method includes receiving, by a processor of an electronic device that includes a Bluetooth Low Energy (BLE) interface, a motion initiation message from a second electronic device while the electronic device is unlocked, the second electronic device being communicatively linked with the electronic device for BLE channel sounding and distance measurement. The method further includes initiating a BLE Channel Sounding (BLECS) process using a distance calculation algorithm, where the BLECS process includes sending periodic channel sounding subevents and obtaining distance measurement results corresponding to the periodic channel sounding subevents. The method includes determining a current distance between the electronic device and the second electronic device based on the distance measurement results, and in response to determining that the current distance exceeds a predetermined distance threshold, invoking a lock screen on the electronic device.