The analysis and demonstration of articulation nodes’s
attribute characteristics in homogeneous wireless sensor networks
Abstract
Wireless sensor networks are the networks with limited power. The routing algorithms recently published which have considered the energy efficiency problem, however, do not distinguish the nodes with different significances. The nodes connecting different regions are widespread in the networks, their failure will bring on “sensor island” and “energy hole”. Relative to other nodes, such nodes have greater impact on the network’s lifetime, and we call them articulation nodes. Based on considering the energy of nodes, the paper gives three attribute chatacteristics: flow factor、bridging factor 、convergence factor，and two ways to find articulation nodes:using energy model to find and finding key nodes in the connected gragh. At the same time,we use network simulator NS2 to simulate and verify our analysis results. Experimental results show that the failure of nodes identified by the model will have a serious impact on the connectivity of the network. At this point the other nodes also have a large number of surplus energy. So, we can take different energy control strategy over the articulation nodes to achieve network lifetime as long as possible.
