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Lei Fu
Henan University of Science and Technology

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A Cooperative Time Synchronization Protocol for Wireless Sensor Networks Min Li; Guoqiang Zheng; Jishun Li; Lei Fu
Indonesian Journal of Electrical Engineering and Computer Science Vol 12, No 9: September 2014
Publisher : Institute of Advanced Engineering and Science

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.11591/ijeecs.v12.i9.pp6874-6883

Abstract

The synchronous precision of synchronization protocol is low and the scalability is limited strictly in large scale wireless sensor networks (WSNs).Considering the issue, a novel cooperative time synchronization protocol based on pulse-coupled oscillators and distributed diffusion (CTSP) is proposed in this paper. The protocol works in two phases：clock tick synchronization phase and time synchronization phase．In the clock tick synchronization phase, the phases of the pulse-coupled oscillators is changed by the pulse coupled signal of the SINK node. The tick synchronization of all nodes is achieved by distributed diffusion. In time synchronization phase, the average time of reference nodes is spread to a limited number of hops based on two-way message exchange mechanism. Moreover, in order to achieve the synchronization of entire network, it adopts the method of mutual diffusion to finish the approximately synchronization between the node time and the average time of all nodes. By comparing CTSP with TPSN, we show that, CTSP can synchronize the network quickly with good precision convergence speed and scalability, which appropriates for large-scale WSNs.
Multi-track Mobile Data Collection Mechanism for Wireless Sensor Networks Lei Fu; Guoqiang Zheng; Jishun Li
Indonesian Journal of Electrical Engineering and Computer Science Vol 12, No 2: February 2014
Publisher : Institute of Advanced Engineering and Science

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Abstract

Wireless sensor networks (WSNs) have been widely researched by countries and institutes. The limited node energy has already become a constraint of large-scale applications. Seeking the energy-balance features at sensor nodes to prolong the network lifetime, a multi-track mobile data collecting mechanism (MTMDC) was proposed in this paper. The MTMDC mechanism was composed of three major phases: the Nodes Estimation Phase, the Energy Estimation Phase and the Multi-track Energy-balance Phase. Based on the three phases, a data collection path for mobile data collector or mobile sink (MS) was built to balance the energy consume of the sensor nodes. Theoretical analysis and performance simulations indicated that the proposed MTMDC mechanism has prominent features compared with the existing approaches in terms of the energy-balance performance and network lifetime. DOI : http://dx.doi.org/10.11591/telkomnika.v12i2.3736
Co-Authors Guoqiang Zheng Jishun Li Min Li