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Issue No. 02 - Feb. (2013 vol. 12)
ISSN: 1536-1233
pp: 261-273
F. El-Moukaddem , Dept. of Comput. Sci., Michigan State Univ., East Lansing, MI, USA
E. Torng , Dept. of Comput. Sci., Michigan State Univ., East Lansing, MI, USA
Guoliang Xing , Dept. of Comput. Sci., Michigan State Univ., East Lansing, MI, USA
Wireless Sensor Networks (WSNs) are increasingly used in data-intensive applications such as microclimate monitoring, precision agriculture, and audio/video surveillance. A key challenge faced by data-intensive WSNs is to transmit all the data generated within an application's lifetime to the base station despite the fact that sensor nodes have limited power supplies. We propose using low-cost disposable mobile relays to reduce the energy consumption of data-intensive WSNs. Our approach differs from previous work in two main aspects. First, it does not require complex motion planning of mobile nodes, so it can be implemented on a number of low-cost mobile sensor platforms. Second, we integrate the energy consumption due to both mobility and wireless transmissions into a holistic optimization framework. Our framework consists of three main algorithms. The first algorithm computes an optimal routing tree assuming no nodes can move. The second algorithm improves the topology of the routing tree by greedily adding new nodes exploiting mobility of the newly added nodes. The third algorithm improves the routing tree by relocating its nodes without changing its topology. This iterative algorithm converges on the optimal position for each node given the constraint that the routing tree topology does not change. We present efficient distributed implementations for each algorithm that require only limited, localized synchronization. Because we do not necessarily compute an optimal topology, our final routing tree is not necessarily optimal. However, our simulation results show that our algorithms significantly outperform the best existing solutions.
wireless sensor networks, data communication, diversity reception, energy consumption, iterative methods, mobility management (mobile radio), optimisation, synchronisation, telecommunication network routing, telecommunication network topology, trees (mathematics), localized synchronization, mobile relay configuration, wireless sensor network, data intensive application, WSN, application lifetime, base station, sensor node, mobile relay, mobile sensor, energy consumption, mobility transmission, wireless data transmission, holistic optimization, optimal routing tree topology, iterative algorithm, Mobile communication, Relays, Topology, Energy consumption, Base stations, Mobile computing, Routing, wireless routing, Wireless sensor networks, energy optimization, mobile nodes

Guoliang Xing, F. El-Moukaddem and E. Torng, "Mobile Relay Configuration in Data-Intensive Wireless Sensor Networks," in IEEE Transactions on Mobile Computing, vol. 12, no. , pp. 261-273, 2013.
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