期刊名称：International Journal of Computer Trends and Technology
电子版ISSN：2231-2803
出版年度：2013
卷号：4
期号：5-4
出版社：Seventh Sense Research Group
摘要：A Wireless Sensor Network (WSN) is composed of a collection of sensor nodes. Sensor nodes being small energy constrained devices; hence the main focus is that these have to be as energy efficient as possible. The focus should also be on minimizing the transmitting and receiving of data, as these are expensive operations. Sensor webs consisting of nodes with limited battery power and wireless communications are deployed to collect useful information from the Region of Interest (ROI). If each node transmits its sensed data directly to the base station then it will deplete its power quickly and reduces network lifetime. The LEACH (Low Energy Adaptive Clustering Hierarchy) protocol is a technique where clusters are formed to fuse data before transmitting to the base station. By randomizing the cluster heads chosen to transmit to the base station, LEACH achieves a factor of 8 improvement compared to direct transmissions, as measured in terms of when nodes die. PEGASIS (PowerEfficient Gathering in Sensor Information Systems), a near optimal chainbased protocol is an improvement over LEACH. In PEGASIS, each node communicates only with a close neighbour and takes turns transmitting to the base station, thus reducing the amount of energy spent per round. The limitations of LEACH and PEGASIS are explained below The proposed method is highly energy efficient. This protocol outperforms LEACH by eliminating the overhead of dynamic cluster formation, minimizing the distance non leadernodes must transmit and using only one transmission to the base station in each round. In PEGASIS the clustering overhead is avoided but it still requires dynamic topology adjustment since a sensor node needs to know about position of its neighbours in order to know where to route its data. Such topology adjustment introduces significant overhead. Here the nodes also require global knowledge of the network. The proposed method, a hybrid approach, an improvement over LEACH & PEGASIS is based on the concept of clustering and chaining. The proposed method is named as CCCP. The proposed method gives 200% and 60% improved performance over LEACH and PEGASIS respectively. So this protocol is better than these two protocols. It eliminates most of the limitations of LEACH and PEGASIS.
关键词：LEACH- Low Energy Adaptive Clustering Hierarchy; PEGASIS- Power Efficient Gathering in Sensor Information Systems; CCCP- chain Clustered Communication Protocol; ROI- Region of Interest
