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Optimal Number of Relays in Cooperative Communication in Wireless Sensor Networks

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DOI: 10.4236/cn.2012.42014    4,436 Downloads   8,830 Views   Citations

ABSTRACT

Wireless Sensor Networks (WSN) typically consist of resource constrained micro sensors that organize itself into multihop wireless network. Sensors collect data and send it directly, or through intermediate hops in cooperative communication system, to the collection point. These sensors are powered up by batteries, for which the replacement or recharging is very difficult. With finite energy, we can transmit a finite amount of information. Therefore, minimizing the power consumption for data transmission becomes a most important design consideration for wireless sensor networks. In this paper, we discuss the optimal power consumption in cooperative wireless sensor network that are placed on a grid. We study different cases for the optimal power consumption in such grids by varying the grid distance and number of nodes in the grid. We assume the cases of grids from 2 × 2 up to 5 × 5 in increasing complexity of calculations. The results show that the optimal path that consumes the least power is the path along the diagonal using of the grid when the source and the destination and the furthest two nodes in the grid. This path takes intermediate nodes (relays) along it based on some threshold distances. For example, in 5 × 5 cases; the first threshold between the direct distance and between using one relay in the middle is 31.6 m the second threshold distance is 63.3 m after which using three relays is the best in power consumption between the source and the destination.

Cite this paper

W. Mardini, Y. Khamayseh and S. AL-Eide, "Optimal Number of Relays in Cooperative Communication in Wireless Sensor Networks," Communications and Network, Vol. 4 No. 2, 2012, pp. 101-110. doi: 10.4236/cn.2012.42014.

Conflicts of Interest

The authors declare no conflicts of interest.

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