Issue No.06 - June (2009 vol.8)
Stephen A. Jarvis , The University of Warwick, Coventry
Guang Tan , INRIA-Rennes, Rennes
DOI Bookmark: http://doi.ieeecomputersociety.org/10.1109/TMC.2009.31
Mobile sensors can relocate and self-deploy into a network. While focusing on the problems of coverage, existing deployment schemes largely oversimplify the conditions for network connectivity: They either assume that the communication range is large enough for sensors in geometric neighborhoods to obtain location information through local communication, or they assume a dense network that remains connected. In addition, an obstacle-free field or full knowledge of the field layout is often assumed. We present new schemes that are not governed by these assumptions, and thus adapt to a wider range of application scenarios. The schemes are designed to maximize sensing coverage and also guarantee connectivity for a network with arbitrary sensor communication/sensing ranges or node densities, at the cost of a small moving distance. The schemes do not need any knowledge of the field layout, which can be irregular and have obstacles/holes of arbitrary shape. Our first scheme is an enhanced form of the traditional virtual-force-based method, which we term the Connectivity-Preserved Virtual Force (CPVF) scheme. We show that the localized communication, which is the very reason for its simplicity, results in poor coverage in certain cases. We then describe a Floor-based scheme which overcomes the difficulties of CPVF and, as a result, significantly outperforms it and other state-of-the-art approaches. Throughout the paper our conclusions are corroborated by the results from extensive simulations.
Sensor networks, mobile, deployment, connectivity.
Stephen A. Jarvis, Guang Tan, "Connectivity-Guaranteed and Obstacle-Adaptive Deployment Schemes for Mobile Sensor Networks", IEEE Transactions on Mobile Computing, vol.8, no. 6, pp. 836-848, June 2009, doi:10.1109/TMC.2009.31