The Construction And Routing Method Of Virtual Sensing Network Based On Place

In recent years,the mobile sensing is the research progress of wireless sensor network.With the development of technology and cost reduction,quite a variety of sensors are embedded in smart phones and other mobile devices,such as camera sensor,light sensor,temperature sensor,humidity sensor and so on.The environmental sensing data collected by smart phones can send to the server by the cellular network.But the cellular network flow is limited,the price is expensive,and the long-distance wireless communication also consumes too much mobile nodes' electricity.Opportunistic mobile network that no need infrastructure to support,is highly regarded by the researchers.In the exiting opportunistic mobile sensor network,data transmission between nodes depends on transient and opportunistic contacts.It's hard to establish a reliable end–to–end connection.In this paper,we research the construction and routing method of virtual sensing network.The virtual sensor network is the opportunistic mobile network based on “place”.This paper focuses on mobile devices in specific places to establish a relatively stable connection.It avoids discussing mobile devices' opportunistic and brief encounter,and also the unpredictable node mobility problem.The main work is as follows:1)By making a thorough research on opportunistic mobile sensor network,we learn the shortcomings of the current research.How to collect the sensor data in dynamic and uncertain opportunistic mobile sensor network is one of the important works to researchers.Because structure of human society is complex,Simulation of the scene can hardly reflect the real moving process of nodes,so we cannot reach the stable data routing by establishing a mobility model accurately.That's why we introduce the concept of "place" in this paper.2)We build the virtual sensor network based on “place”,then design and realize its network model in THE ONE simulator.The virtual sensor network takes advantage of the rule that people's activity is “Place-Centric”,and the opportunistic contacts in these places are long and stable to exchange data adequately.While the data's collection and routing is depending on people's natural flow between different places.3)The routing method is proposed for the virtual sensor network,and we evaluate the VSN's performance.In this paper,the virtual router nodes are hierarchical addressed,and the data is hierarchical forwarded.The routing algorithm is designed by the stability topology of the virtual sensor network,Including virtual greedy routing method and the minimum cost routing method.Compared it to the opportunistic mobile network,and the transmission success rate is higher without a doubt.So the virtual sensor network constructed in this paper has a higher transmission stability and reliability,and the routing methods have the characteristics of a small transmission delay.