Date Added: Jul 2011
Clustering of sensor nodes to reduce energy expense during data communication covers a large body of literature. Without clustering energy of sensor nodes near the sink drain fast, which in turn kills more rapidly nodes at further hop distances. Cluster-based routing protocol alleviates this problem. Yet, in cluster-based approaches too, for hop-by-hop communication, power of nodes nearer to the Cluster Head (CH) are drained more rapidly compared to those at the periphery, as they are more often used as hopping nodes. This is more so when the cluster is big. For too small cluster, there is no meaning in clustering. Uniform dissipation is achieved by reconfiguring the clusters at intervals, which is a big signalling overhead.