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On the Trade-off between Power Consumption and Time Synchronization Quality for Moving Targets under Large-Scale Fading Effects in Wireless Sensor Networks

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Communications and Network 2013年第3期5卷 498-503页

作者： Pablo Briff Leonardo Rey Vega ariel lutenberg Fabian Vargas Embedded Systems Laboratory Faculty of Engineering University of Buenos Aires Argentina Signal Processing and Communications Laboratory Faculty of Engineering University of Buenos Aires Argentina Signals and Systems for Computing Group Faculty of Engineering Catholic University PUCRS Brazil

In this work we find a lower bound on the energy required for synchronizing moving sensor nodes in a Wireless Sensor Network (WSN) affected by large-scale fading, based on clock estimation techniques. The energy required for synchronizing a WSN within a desired estimation error level is specified by both the transmit power and the required number of messages. In this paper we extend our previous work introducing nodes’ movement and the average message delay in the total energy, including a comprehensive analysis on how the distance between nodes impacts on the energy and synchronization quality trade-off under large-scale fading effects.

关键词： Wireless Sensor Networks Clock Offset Estimation Time Synchronization Wireless Channel Fading Moving Targets

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On Energy-Efficient Time Synchronization for Wireless Sensors under Large-Scale and Small-Scale Fading Effects

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Wireless Sensor Network 2013年第10期5卷 181-193页

作者： Pablo Briff ariel lutenberg Leonardo Rey Vega Fabian Vargas CONICET National Scientific and Technical Research Council Buenos Aires Argentina LPSC Faculty of Engineering University of Buenos Aires Buenos Aires Argentina Embedded Systems Laboratory Faculty of Engineering University of Buenos Aires Buenos Aires Argentina Embedded Systems Laboratory Faculty of Engineering University of Buenos Aires Buenos Aires Argentina CONICET National Scientific and Technical Research Council Buenos Aires Argentina Signals and Systems for Computing Group Faculty of Engineering Catholic University Porto Alegre Brazil

In this work, the existing trade-off between time synchronization quality and energy is studied for both large-scale and small-scale fading wireless channels. We analyze the clock offset estimation problem using one-way, two-way and N-way message exchange mechanisms affected by Gaussian and exponentially distributed impairments. Our main contribution is a general relationship between the total energy required for synchronizing a wireless sensor network and the clock offset estimation error by means of the transmit power, number of transmitted messages and average message delay, deriving the energy optimal lower bound as a function of the time synchronization quality and the number of hops in a multi-hop network.

关键词： Wireless Sensor Networks Clock Offset Estimation Time Synchronization Wireless Channel Fading

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