Advance in Electronic and Electric Engineering. ISSN 2231-1297, Volume 3, Number 1 (2013), pp. 1-6 © Research India Publications http://www.ripublication.com/aeee.htm Query Processing in Wireless Sensor Network Akshay Agrawal 1 , Lokesh Gupta, Bikash Kr. Behera 1 , Reddipalli Balaji 2 , Vijender Bhootna 3 1 Department of Electronics & Communication Engineering, JRE Group of Institutions, Greater Noida 2 Department of Electrical Engineering, JRE Group of Institutions, Greater Noida. 3 Department of Applied Electronics & Instrumentations, JRE Group of Institutions, Greater Noida. Abstract: A sensor network is composed of a large number of sensor nodes that are densely deployed either inside the phenomenon or very close to it. The position of sensor nodes does not need to be engineered or predetermined. This allows random deployment in inaccessible terrains or disaster relief operations which in one way or the other is a boon. On the other hand, this also implies that the sensor network protocols and algorithms must possess self-organizing capabilities. Another dispensable feature of sensor networks is the cooperative effort of the sensor nodes. Recent advances in wireless communications and electronics have enabled the development of low-cost, low-power, multifunctional and multitasking sensor nodes that are small in size and communicate undisturbed in short distances. These tiny sensor nodes, which consist of sensing, data processing, and communicating components, leverage the idea of sensor networks. Sensor networks represent a significant improvement over traditional sensors. Wireless sensor networks are formed of tiny, highly energy-constrained sensor nodes that are equipped with wireless transceivers. They may be mobile and are usually deployed in large numbers in unfamiliar environments. The nodes communicate with each other by autonomously creating ad-hoc (inter connected) networks which are actively used to gather sensor data. WSNs also process the data within the network itself and only forward the result to the requesting node. Keywords: WSN (Wireless Sensor Network)