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무선 센서 네트워크에서의 노드의 Sleep-Wake Cycle을 사용한 저 전력 시간 동기화 방법

무선 센서 네트워크에서의 노드의 Sleep-Wake Cycle을 사용한 저 전력 시간 동기화 방법
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Time synchronization is one of the fundamental services that must normally be supported for wired and wireless networks. A wireless sensor network (WSN) has tight requirements and constraints including limited battery power, rapid change of communication environment and low reliability. Several time synchronization algorithm such as RBS, TPSN and FTSP, have been proposed for WSNs. However, these algorithm did not consider power management issues in depths. Thus, this paper proposes a low power time synchronization algorithm that reduces the percentage of time a node has to be awake (duty cycle), assuming that a periodic sleep-wake cycle is used to conserve energy. Based on measurement using actual WSN devices, a system model is proposed. Analysis, with various parameter values, is used to quantify the required synchronization interval (T) for a given level of synchronization accuracy, and power consumption estimation using actual energy consumption of WSN nodes. To further demonstrate the feasibility of our method, experiments were conducted using sixteen WSN devices connected in a 4 * 4 grid network topology. We measured the average and maximum synchronization error and power consumption with the proposed algorithm, and compared the results with FTSP. The results showed that network lifetime increased 9.5 times when T is 20 seconds, and 13.6 times when T is 30 seconds. On the other hand, the synchronization error was 140.1s in FTSP and 131.4s in proposed algorithm when T is 20 seconds, and 143.0s in FTSP and 140.3s in proposed algorithm when T is 30.
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