A Wireless Sensor Networks (WSNs) is a specialized wireless network made up of large number of sensors and at least one base station. A wireless sensor network is a collection of nodes organized into a cooperative network. The study of wireless sensor networks is challenging in that it requires an enormous breadth of knowledge. Wireless sensor network have gained enormous attention for their wide range of applications such as environment monitoring, military surveillance, health care, disaster management etc. Sensor nodes have a resource constraint (i.e. battery power, storage and communication capability). These sensor nodes are set with radio interface by which they are communicated with one to another. In this Paper we discussed hierarchical based routing protocols. The goal of this Paper is to present the comprehensive review of various aspects of WSN and discuss some hierarchical energy efficient routing protocols in wireless network.
Wireless Sensor Network, Sensor node, Energy-efficiency, Routing protocols, Network lifetime.