engleski

Self-synchronization of nonidentical machines in Machine-to-Machine Systems

The notion of common time is very important information in distributed systems (e.g., for maintaining the consistency of distributed data). Namely, due to the lack of global time and imperfections (e.g., skew) of physical clocks, in order to agree on common time, distributed nodes have to synchronize themselves. Imperfections of physical clocks are even more emphasized in heterogeneous distributed systems called Machine- to-Machine (M2M) systems in which communication refers to the communication among different machines that communicate using different types of communication technologies without, or with limited human intervention. Research challenge in this paper is to propose a mechanism for different machines in a heterogeneous M2M system to achieve self-synchronization using a self-organizing principle inspired by fireflies. The proposed mechanism is based on an idea of dynamically adjusted frequencies. It was showed that when using the proposed mechanism, time synchronization can be achieved with a precision of 69 ms which corresponds to 1.5% of the time synchronization cycle length

pulse-coupled oscillators model; Waspmote Libelium sensor platform; Bluetooth; XBee

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