International Journals of Advanced Information Science and Technology (IJAIST)
Wireless sensor network consists of many tiny disposable low power devices called nodes, which are spatially distributed in order to perform various application global tasks. These nodes form a network by communicating with each other either directly or through other nodes. Sensor networks are fundamentally constrained by the difficulty and energy expense of delivery information from sensor to sink. Power saving is a critical issue in wireless sensor networks since sensor nodes are powered by batteries which cannot generally change or recharged. In this paper, the authors have focused on radio communication which is often considered as the main cause of energy consumption.