WeSync(BLE): A Reference Synchronization Architecture of Multiple Wearable BLE-Based Biomedical Devices

Recent advances in embedded systems, wireless communication, and IoT technologies have driven the development of Wearable Health Devices (WHDs), enabling continuous monitoring of biosignals with low power consumption and high data transmission rates. Among various wireless communication protocols, Bluetooth Low Energy (BLE) stands out due to its energy efficiency and high transmission rate, making it the preferred choice for developing compact and high-performance wearables. However, achieving precise time synchronization across multiple BLE-enabled devices remains a challenge, particularly in distributed systems where sensor nodes operate independently. In this work, we present the WeSync(BLE) our reference synchronization architecture developed for multiple wearable BLE-based biomedical devices intended to streamline the use of numerous wearable devices and synchronize the data acquired across them. A proof-of-concept of this reference synchronization architecture was made using proprietary BLE wearables (used for acquiring motion data). This demonstrated effective synchronization with minimal implementation and latency, achieving an absolute mean and standard deviation of 9.2 ± 6.7 milliseconds, at 1 hour of testing. This work paves the way for a more robust real-time wearable systems synchronization, advancing the analysis and study of biosignals.