Research On Some Key Techniques Of Wireless Sensor Networks

With the further developments of MEMS,SoC,DCT,WCT and PT,Wireless Sensor Network that consists of large scale sensor nodes is deployed in many fields. These potential applications in military,science and business fields accelerate the lucubration of MEMS,and so on.And that forms a benign circle.The sensor node's power is mainly supplied by battery,but on the other hand,it is very difficult even impossible to replace or recharge batteries in many application environments.So it is necessary to consider energy-efficient and application environments when protocol is designed.In the proposed paper,some new strategies are presented as follows:1.After analyzing event-driven network,we propose a routing protocol based on CA negotiation to tackle the redundant nodes and related secondary disaster problem. Node can decide whether to send DATA packet to Base Station directly or not after negotiating with its neighbor nodes using the proposed mechanism.Because the negotiation processes are only executed among driven-nodes,the phenomena of secondary disaster are avoided.In simulation environment,we examine Flooding routing protocol,SPIN routing protocol and SPCAN routing protocol.Simulation results indicate that SPCAN protocol can enhance the effective sent packet ratio, reduce delay time and system energy dissipation.2.A load-balance algorithm based on pruning technology is proposed to tackle the hot spot phenomena.Hot spot phenomena are caused by unbalance load distribution in cluster algorithms.The proposed mechanism dynamically selects CH by computing weight value of location,residual energy and times as CH in current round.According to threshold and node's state,at least one node is selected as CH.If more than one node in one round is selected as CHs,they will wake-up as CH in order of the weight value.In simulation environment,we analysis different node numbers in one cluster,ratios of different locations,times selected as CH,residual energy and the proposed load balance algorithm's application.Results show that:the proposed algorithm can efficient balance the load in WSN.More energy is saved by reducing energy consumed during the processing of selection CH.3.A novel scheme of audient ratio inquire system(ARIS) is described.Currently, audient ratio inquires system may occupy informant's resources and that will affect informants and make inquire result lost objectivity more or less,which can avoid informants inflected by using wireless communication to send data to manager and can make an inquired process when receive order from managers.So far as we know, there are no similar system in China is proposed or produced.