Time Synchronization for WSN Nodes Operating on Low-Energy Sleep-Wake Cycles
Ho-Jung Yun, Joo-Sung Yun, Sung-Gu Lee · 2010
Previous low-energy time synchronization methods have mainly focused on reducing the number of transmission or reception packets. However, this paper proposes a method that reduces the percentage of time a node has to be awake (the duty cycle), assuming that a periodic sleep-wake cycle is used to conserve energy. Based on our experience with actual WSN devices, a system model is proposed, and the potential performance of the proposed method, with different parameter values, is analyzed. To further demonstrate the feasibility of our method, experiments were conducted using nine WSN devices in a grid network topology. The results show the average synchronization error is 107.57 in duty cycle 5% and synchronization period 10 sec, and 130 in duty cycle 2.5% and synchronization period 20 sec.