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Sensors 2009, 9(7), 5173-5200; doi:10.3390/s90705173
Article

On Connected Target Coverage for Wireless Heterogeneous Sensor Networks with Multiple Sensing Units

1
, 2
, 3,*  and 4
Received: 2 May 2009; in revised form: 14 June 2009 / Accepted: 23 June 2009 / Published: 30 June 2009
(This article belongs to the Special Issue Wireless Sensor Technologies and Applications)
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Abstract: The paper considers the connected target coverage (CTC) problem in wireless heterogeneous sensor networks (WHSNs) with multiple sensing units, termed MU-CTC problem. MU-CTC problem can be reduced to a connected set cover problem and further formulated as an integer linear programming (ILP) problem. However, the ILP problem is an NP-complete problem. Therefore, two distributed heuristic schemes, REFS (remaining energy first scheme) and EEFS (energy efficiency first scheme), are proposed. In REFS, each sensor considers its remaining energy and its neighbors’ decisions to enable its sensing units and communication unit such that all targets can be covered for the required attributes and the sensed data can be delivered to the sink. The advantages of REFS are its simplicity and reduced communication overhead. However, to utilize sensors’ energy efficiently, EEFS is proposed. A sensor in EEFS considers its contribution to the coverage and the connectivity to make a better decision. To our best knowledge, this paper is the first to consider target coverage and connectivity jointly for WHSNs with multiple sensing units. Simulation results show that REFS and EEFS can both prolong the network lifetime effectively. EEFS outperforms REFS in network lifetime, but REFS is simpler.
Keywords: connectivity; heterogeneous sensors; multiple sensing units; target coverage; wireless sensor networks connectivity; heterogeneous sensors; multiple sensing units; target coverage; wireless sensor networks
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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MDPI and ACS Style

Shih, K.-P.; Deng, D.-J.; Chang, R.-S.; Chen, H.-C. On Connected Target Coverage for Wireless Heterogeneous Sensor Networks with Multiple Sensing Units. Sensors 2009, 9, 5173-5200.

AMA Style

Shih K-P, Deng D-J, Chang R-S, Chen H-C. On Connected Target Coverage for Wireless Heterogeneous Sensor Networks with Multiple Sensing Units. Sensors. 2009; 9(7):5173-5200.

Chicago/Turabian Style

Shih, Kuei-Ping; Deng, Der-Jiunn; Chang, Ruay-Shiung; Chen, Hung-Chang. 2009. "On Connected Target Coverage for Wireless Heterogeneous Sensor Networks with Multiple Sensing Units." Sensors 9, no. 7: 5173-5200.


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