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영어

In this paper, we propose a specific time synchronization protocol called MSTSP (Master Slave Time Synchronization Protocol). We designed MSTSP based on the master-slave topology in order to synchronize the time of the heterogeneous sensor nodes. Heterogeneous sensor networks can be used in various risk-associated areas. Time synchronization among the heterogeneous sensor nodes is essential in Ubiquitous Sensor Network systems. In MSTSP, the time-sync master nodes can always be synchronized with the Sink Node of USN, because the sensor nodes which are homogeneous with the Sink Node become time-sync master nodes. And other sensor nodes which differ from the Sink Node must be time-sync slave nodes, which need to belong to one of the specific master nodes. The time-sync master nodes then enable time-sync slave nodes to be synchronized with the sleep periods. The proposed MSTSP is also useful for power saving by maintaining maximum sleep time.