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Vol. 130, Issue 7, July 2011, pp.61-76

 

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Extending Coverage and Lifetime of K-coverage Wireless Sensor Networks Using Improved Harmony Search

 

Shohreh Ebrahimnezhad, Hoda Jalal Kamali and Mohsen Ebrahimi Moghaddam

Electrical and Computer Engineering Department

Shahid Beheshti University; G.C; Tehran, Iran

Tel.: +98-21-2990-2268, fax: +98-21-2397-9896

E-mail: sh_ebrahimnezhad@yahoo.com, h_kamali_87@yahoo.com, m_moghadam@sbu.ac.ir

 

 

Received: 1 June 2011   /Accepted: 22 July 2011   /Published: 29 July 2011

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Abstract: K-coverage wireless sensor networks try to provide facilities such that each hotspot region is covered by at least k sensors. Because, the fundamental evaluation metrics of such networks are coverage and lifetime, proposing an approach that extends both of them simultaneously has a lot of interests. In this article, it is supposed that two kinds of nodes are available: static and mobile. The proposed method, at first, tries to balance energy among sensor nodes using Improved Harmony Search (IHS) algorithm in a k-coverage and connected wireless sensor network in order to achieve a sensor node deployment. Also, this method proposes a suitable place for a gateway node (Sink) that collects data from all sensors. Second, in order to prolong the network lifetime, some of the high energy-consuming mobile nodes are moved to the closest positions of low energy-consuming ones and vice versa after a while. This leads increasing the lifetime of network while connectivity and k-coverage are preserved. Through computer simulations, experimental results verified that the proposed IHS-based algorithm found better solution compared to some related methods.

 

Keywords: Wireless sensor networks, Improved harmony search, K-coverage, Lifetime, Mobile sensors

 

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