| Agriculture is the foundation of the national economy. However because ofChina’s agricultural information technology, automation level is not high, productionmode is relatively backward, it is difficult to form scale agriculture and carry outeffective agricultural co-production which resulting in some problems such as thesmall size of agricultural production and poor economic efficiency. Currently,agricultural information has provided solid foundation for precision agriculture andimproving agricultural management level. It has become an important mean to improveagricultural production efficiency.The Internet of things is more suitable for use in a larger geographical scopebecause of its ubiquitous, mobility and flexibility. By wire or wireless means,collecting data from a variety of types of agricultural crop sites, agricultural equipment,mobile terminals and sensors.Wireless sensor networks has the characteristics of nowiring, layout flexibility, free band, the declining cost and low-power nodes etc. It isthe important networking and information access tools in important things in theperception of the Internet. And it is increasingly being applied to intelligent networkingof agricultural production.On the one hand, agricultural production site often presents many blocksdistribution pattern. Wireless network nodes deployed densely in the cluster blocks. Onthe other hand, there is often a big space and some roads, lighting along the road,power lines or wired communications infrastructure linked among blocks. With thecontinuous development in modem technology, transmission technology and signalprocessing technology, power line communication has become more and more applied.Power lines without rewiring, low cost, widespread in the field of agriculture, andtherefore is been used more and more in agricultural monitoring. Traditional heterogeneous agricultural monitoring networking usually refers todifferent node in the network deployment, making the nodes have different initialenergy, different perception, different data transfer capability. In this paper, weproposed a power line backbone and ZigBee wireless subnet mixed, static gateway andmobile sink in wireless subnets combining heterogeneous agriculture monitoringnetworking. This heterogeneous networking mainly composed by the control center,power line backbone and ZigBee wireless network subnet three parts.1) Control Centerdeployed in areas far away from the monitoring area, such as laboratories, according todata received form the gateway node to coordinate and control the wirelesssub-network, and finally sent the information to a remote user through Internet.2)Power line backbone is combined by the power lines and gateway node deployed nearthe power line components. Gateway node is stationary and continuous supply by powerlines.3) ZigBee wireless subnets deployment in various sub-regions in agriculturalmonitoring. A large number of low-power ZigBee wireless sensor nodes deployed in thenetwork. Nodes regularly monitoring data and forward the data to the internal gatewaynodes through multi-hop. Internal sink nodes move along the power lines in the wirelesssubnets and finally forward the data to the external gateway nodes.For subnets’ interconnection problem, we proposed a transmission mode based onvirtual channel. Using the principle of multi-machine communication to form somesort of wireless channel model between the center node and gateway nodes. We don’tneed to consider what physical medium between them.For internal wireless subnets, we designed a suitable node topology foragricultural monitoring. We studied the mobile sink routing algorithm through analysisthe characteristics of heterogeneous agricultural networks. First, we designed the singlemobile sink routing protocol. Second, designing a multi-sink mobile network routingprotocol. Finally, we used simulator TOSSIM under the TinyOS operating system tosimulate the above protocols, and analysised the superiority of network’s lifetime andenergy consumption. |
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