| Mobile crowd sensing,as a new paradigm,means that mobile users equipped with smart devices to solve large-scale mobile sensing tasks through wireless communication.Data transmission schemes with opportunistic network in mobile crowd sensing have attracted widespread attention in recent years,which attempt to reach high delivery and low consumption.However,most transmission schemes resort to users' trajectory and connection history that are dynamic and difficult to calculate,causing it so hard to establish stable connection channel.Existing data transmission schemes still have defects on delivery ratio and overhead ratio.A deep research and discussion is made in this thesis based on Archimedes curve and static nodes for data transmission scheme in opportunistic network with mobile crowd sensing.We design a static nodes based energy-efficient data transmission protocol for earthquake response scenarios,to achieve improved resource economy,which deploys Archimedes curve to assist information transmission.The Archimedes curve has uniformly distributed without mutual interference characteristics,so in this paper we utilize the right amount of static nodes arranged in the Archimedes curve started with the central point of earthquake.At the same time,we choose nodes as central group for message forwarding,which have higher utility,i.e.,enough energy,adequate cache,and more active.And the information is transferred by them.The internal and external combination was carried in this protocol,we use the static nodes that are specially deployed,mean while we also use the high efficient nodes of the network itself which can both guarantee the delivery success overhead ratio.In addition,in order to further improve the success rate of data transmission,we propose a scheme that the probability of success for static nodes and dynamic nodes are refreshed in different ways.Finally,in order to facilitate the analysis and improvement of the algorithm,this paper designs a visual simulation system. |
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