Research On WSN Data Aggregation Mechanism Based On Distributed Delay

Wireless Sensor Network(WSN)has been widely used because of its selforganization,large-scale,data-centric and high reliability.WSN is a self-organized and efficient network system,which is established by a large number of cheap sensor nodes through wireless communication.The nodes accomplish their tasks through mutual cooperation,and do not rely on any fixed infrastructure.However,from the physical layer to the application layer of wireless sensor networks,all kinds of data increasing multiply.If these data can not be processed timely and accurately,it will seriously increase the burden of the network.It makes data aggregation technology particularly important for WSN.Data aggregation technology can extract useful information and reduce the network load,but it will undoubtedly increase time delay.In addition,sensor nodes are usually deployed in areas where it is difficult to reach or in harsh environments.The difficulty in replacing batteries also makes the problem of how to prolong the network lifetime become a major challenge for researchers nowadays.Nodes can save energy by periodically changing their working state,but it also increases the network delay.Based on the above,aiming at the delay problem,a Distributed Collision-Free Data Aggregation Scheme(DCF-DAS)is proposed to enable the network to aggregate data without conflict by establishing the data aggregation tree and periodically changing the working state of nodes,so as to save node energy and reduce time delay.The simulation results show that DCF-DAS can effectively reduce the time required for data aggregation.