Date Added: Nov 2009
Wireless Sensor Networks are important to node's energy consumption for long activity of sensor nodes because nodes that compose sensor network are small size, and battery capacity is limited. For energy consumption decrease of sensor nodes, sensor network's routing technique is divided by flat routing and hierarchical routing technique. Specially, hierarchical routing technique is energy-efficient routing protocol to pare down energy consumption of whole sensor nodes and to scatter energy consumption of sensor nodes by forming cluster and communicating with cluster head. But though hierarchical routing technique based on clustering is advantageous more than flat routing technique, this is not used for reason that is not realistic.