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Improvement of Energy Efficiency of LEACH Protocol for Wireless Sensor Networks  

Lee, Sang-Hoon (연세대학교 컴퓨터정보통신공학부 정보통신망연구실)
Suk, Jung-Bong (연세대학교 컴퓨터정보통신공학부 정보통신망연구실)
Publication Information
The Journal of Korean Institute of Communications and Information Sciences / v.33, no.2B, 2008 , pp. 76-81 More about this Journal
Abstract
LEACH (Low Energy Adaptive Clustering Hierarchy) has been proposed as a routing protocol with a hierarchical structure, in order to achieve the energy efficiency that is of primary importance in the wireless sensor networks. A wireless sensor network adopting LEACH is composed of a few clusters, each of which consists of member nodes that sense the data, and head nodes that deliver the collected data from member nodes to a sink node that is connected to a backbone network. A head node in a cluster allocates TDMA slots to its member nodes without taking into account whether they have data to transmit or not, thus resulting in inefficiency of energy usage of head node that remains in active mode during the entire round time. This motivates us to propose a scheme to improve the energy efficiency of LEACH, by assigning TDMA slots only to those member nodes who have data to send. As a result, the head node can remain sleep during the period of no data transmission from member nodes, leading to the substantial energy saving. By using the ns-2 simulator, we evaluate the performance of the proposed scheme in comparison with the original LEACH. Experimental results validate our scheme, showing a better performance than original LEACH in terms of the number of outliving nodes and the quantity of energy consumption as time evolves.
Keywords
Wireless sensor network; LEACH; Energy efficiency; Ns-2 simulation;
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