6LoWPAN Research And Implementation In WSN Nodes

Wireless Sensor Networks have a broad application prospect in environmental protection, industrial monitoring, smart home and other related fields. What promote the combination of IPv6protocol and WSN is that Wireless Sensor Networks exit everywhere and the number of WSN nodes is large, as well as the urgent need of end to end communication with Internet. IPv6not only can provide a large number of IP address required in Wireless Sensor Networks, but also support stateless address auto configuration to meet the self-organizing need of large-scale Networks. However, because of the feature of the Wireless Sensor Networks node, such as low capacity, limited memory and limited energy, IPv6protocol cannot be completely transplanted to sensor nodes. So this paper mainly research6LoWPAN (IPv6over Low-Power Wireless Personal Area Network) and its implementation in WSN nodes, try to apply IPv6to WSN and provide a solution for making Wireless Sensor Networks access to the Internet.The paper analyzed key technologies of6LoWPAN, such as the architecture of6LoWPAN-based Wireless Sensor Networks, adaptation Layer technology, the stateless address auto configuration of WSN nodes, routing and forwarding technology. Then analyzed existing6LoWPAN protocol stack, based on Contiki operating system, the paper integrated, modified and added the fragmentation and reassembly of6LoWP AN data and IPv6header compression and decompression in existing protocol stack, achieved the basic function of6LoWPAN adaptation layer protocol stack. The paper designed and implemented IPv6address configuration and routing in WSN nodes, then the IPv6data can be transported through the network between Wireless Sensor Networks and the Internet.The paper added6LoWPAN-based Wireless Sensor Networks protocol stack in existing environmental monitoring system platform of our Lab, achieved a specific experimental system, completed environmental data collection and uploaded the data by6LoWPAN, then PC client access the network database to achieve real-time data display. In system test process, the connection between6LoWPAN-based Wireless Sensor Networks and IPv6network is successfully established, the result achieve the desired design goal. The test results showed the correctness of6LoWPAN research and the feasibility of the design scheme, and the paper provided a solution on the implementation of IPv6protocol in Wireless Sensor Networks.