Aggregation Research And Test Bed Hardware Design In WSN

With the development of sensor technology, microelectronics technology, modern networks and wireless communication, the wireless sensor networks advances quickly. Wireless sensor networks involve many sectors, becoming a hot topic of research in the field of IT.The wireless sensor network nodes energy resources are very limited computing power and bandwidth and the wireless sensor networks are formed by the large number of sensors. This determines the degree of wireless sensor network protocol stack designed to be energy-efficiency. By the data aggregation in wireless sensor networks, the energy was largely saved.In allusion to service types and transmission packets of network levels in wireless sensor networks, this paper introduces the conception, characteristic and actual research of aggregation strategy in WSN and discuss the method of how to use aggregation technique based on the event driven networks step by step.Based on the single event driven networks, this paper researches on aggregation strategy in wireless sensor networks, propose a method for finding the point of a graph and propose an aggregation algorithm that based on this distributed method. It introduces the process of finding the point 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 point form both mathematics consequence and program emulator.Furthermore, this paper simply introduces the hardware design of WSN test bed. On the test bed, we prove the correction of this algorithm.Through choosing a better node to aggregation data, the purpose of saving energy is achieved.