Date Added: May 2011
In the research area of wireless sensor networks the routing protocol is a major issue. In this paper, the authors intend to discuss some of the major hierarchical routing protocols for wireless sensor networks. First, they will discuss the routing protocols in short and later they will compare the behavior on lifetime and energy. Wireless Sensor Networks consists of very small sensors that are characterized by limited processing power and energy resources. WSNs are used in various domains like military applications, medical engineering, and industrial task automation. They need an optimal network in order to use its processing power at maximum. Technological advance has brought the opportunity to develop and use sensor devices with very small dimensions, low consumption and processing power.