A study in accuracy of time synchronization of BLE devices using connection-based event

Time synchronization over a distributed BLE wireless network poses several challenging problems which may affect the accuracy of time stamping of events recorded by BLE devices. In this paper, we study the accuracy of a time synchronization scheme based on generation of an event in the application program at the time of BLE connection establishment. We discuss the background of the problem, explain the method of measurement used to evaluate the solution in detail, and present the results of time synchronization based on a practical BLE platform. We also explain the relationship between the time synchronization and BLE configuration parameters. The results of our experiments indicate that the accuracy of our time synchronization during connection establishment is around ±750μs.