Query Optimization in Wireless Sensor Networks

Abstract

A wireless sensor network (WSN) is a wireless network consisting of distributed autonomous devices using sensors to cooperatively monitor physical or environmental conditions, such as temperature, sound, vibration, pressure, motion or pollutants, at different locations. A WSN Consists of ten to thousand of sensor nodes that communicate through wireless channels for information sharing and cooperative processing. We attach the sensor nodes to specific items to be monitored, covering an area with locomotive sensor nodes. The sensor node is also known as mote. In WSN all the sensor nodes send the data to a sink node. We consider the sink node as base station node, which is more powerful in comparison to other nodes in case of data processing, storage etc. Queries are also submitted at the base station. In this our main focus is on base station queries optimization. When a new query is submitted to the base station, we check whether the new query can be evaluated using the result of currently running queries. If it is possible then we rewrites a new query using currently running queries at the base station without injecting it into the sensor network. Thus optimizing the query processing in Wireless Sensor Network.