Research On Aggregation Based On Event Driven In Wireless Sensor Networks

The wireless sensor network, which is integration of sensor techniques, MEMS techniques and wireless communication techniques, is an innovative technique of information acquisition and processing. It can sense, collect and process information of monitored object in the covered place. Due to its wide application in military, medical, industrial and environment monitoring, it has already become one of the active research branches of computer science. A few achievements have been acquired, but on some key techniques, there are also a lot of problems in need of resolution. This paper makes research on how to use aggregation technique to save energy in wireless sensor network.This paper introduces the conception, characteristic and actual research of aggregation in WSN. And discuss the method of how to use aggregation technique based on the event driven networks step by step.In allusion to the single event driven networks, this paper researches on aggregation strategy in wireless sensor networks, propose a distributed method for finding the center of a graph and propose a center aggregation algorithm that based on this distributed method. It introduces the process of finding center and building aggregation tree, analyzes the impact of network density and the relatively distance between the event and the sink on energy saving. Compared with the shortest path algorithm, prove the validity of the center aggregation from both mathematics consequence and program emulator.In allusion to the condition that some mutually exclusive events driven at same time, this paper introduce the conception of Group-Aware Network Configuration to improve the algorithm of Building Aggregation Tree, which in the center aggregation algorithm. And try to utilize the concept of weak father-node and strong father-node to switch a"better"parent, for saving energy.