Time synchronization in wireless sensor network applications
SEUS'07 Proceedings of the 5th IFIP WG 10.2 international conference on Software technologies for embedded and ubiquitous systems
Recent additions on the application programming interface of the TMO support middleware
Proceedings of the 13th Monterey conference on Composition of embedded systems: scientific and industrial issues
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A key challenge in keeping distributed clocks well synchronized in a LAN environment via OS- or middleware-level mechanisms is to create an interference-free condition in a network channel(s) and a non-preemptible on-alert condition in the responsible thread in each node during each resynchronization round while keeping the length of each round as short as possible. An approach for meeting this challenge which is based on the middleware architecture TMOSM, has been presented. A prototype implementation and its measurements indicated that with a typical network of PCs connected via a 10 Mbps Ethernet, the PC nodes can be kept synchronized within the deviation bound of 0.5 milliseconds. The organizing principle is believed to be applicable to many real-time OSs or middleware used to support distributed computing applications.