A Review on Data Aggregation in Wireless Sensor Networks

Wireless Sensor Network is a recent advanced technology of computer networks and electronics. Sensor networks are collection of sensor nodes which co-operatively send sensed data to base station. Wireless sensor networks are used in many applications in military, ecological and health-related areas. These networks are likely to be composed of hundreds and potentially thousands of tiny sensor nodes, functioning autonomously and in many cases, without access to renewable energy resource. These networks are constrained with energy, memory and computing. Power enhance efficient techniques are needed for data aggregation, data collection, query processing, decision making and routing in sensor Networks. Data aggregation is very crucial technique in wireless sensor network. Because with the help of data aggregation we reduce the energy consumption by eliminating redundancy. The security issues like data confidentiality and integrity in data aggregation become vital when the sensor network is deployed in a hostile environment. Most of the aggregation algorithms and schemes do not include any provisions for protection, and consequently these systems are defenseless to a broad diversity of approaches. In the wireless sensor network most challenging task is a life time, so with help of data aggregation we can enhance the lifetime of the network.