A Wireless Sensor Network (WSN) is a collection of small, self-contained electro-mechanical devices that monitor the environment conditions. These sensors can span a large geographical area. These nodes can communicate with each other via hops in an ad-hoc manner. The sensors are battery operated, so they have limited power. Energy is major concern among the Wireless Sensor Networks. There are many design issues for WSNs such as deployment, mobility, infrastructure, network topology, network size and density, connectivity, lifetime, node addressability, data aggregation etc. WSNs can be of...