ABSTRACT
A wireless sensor network (WSN) consists of a set of compact and automated devices called sensing nodes. A sensing node is a computational device that has memory, battery, processor, transceiver and a sensing device. The Berkeley MICA Mote (Hill & Culler, 2002), SmartDust (Kahn et al., 1999, 2000; Warneke et al., 2001) and CotsDust (Hollar, 2000) are examples of such nodes. These nodes are distributed across an area and communicate among themselves, forming an ad hoc network. Sensor networks contain special nodes that process and store the information collected by the network; they are called sink nodes. Communication between two nodes is performed in multiple hops if they are not within each other's transmission range.
