The Design Of6LoWOAN Gateway Based On Contiki

Wireless Sensor Network (WSN) is a network composed of a large number of micro-sensors, it’s included environmental information collection, information processing and information transmission. It’s widely used in the field of smart home, industrial control, medical systems, military surveillance, etc.. It’s, a emerging research focus which is very concerned by the world with knowledge highly integrated. The further development of WSN is to achieve its integration with the network, in other words, make each sensor to access the IP Internet. The number of wireless sensor nodes is very large, IPv4can not meet the requirements if assigned each node an IP address, in order to achieve the WSN access IPv6network, you must use IPv6technology to assign addresses.As we all know,the WSN and IPv6networks are different types of networks, there must have a6LoWPAN gateway between the two networks to achieve their integration. The6LoWPAN gateway is a intermediary and bridge which contacts WSN LAN and the IPv6Internet. The6LoWPAN gateway must have these features:the protocol conversion, data conversion, data storage as well as the ability between different protocols. In the process of design of the6LoWPAN gateway, the most critical is the design of6LoWPAN adaptation layer in software development. The6LoWPAN adaptation layer can complete the protocol and data conversion between the IPv6and IEEE802.15.4, that’s included packet fragmentation and reassembly, as well as the packet header compression.On the one hand, we must find or designed a appropriate communication protocol stack for resource-constrained devices, On the other hand, there will be many problems on the management because of the large number of the wireless sensors, so the need of the embedded operating systems became very urgent. I found transplant the Contiki operating system and the appropriate communication protocol stack on the WSN node can solve the above two problems, through the study and research of the6LoWPAN technology and embedded operating systems.The paper introduces the background and significance of the research. And then research the6LoWPAN technology and the principle of6LoWPAN adaptation layer, including the6LoWPAN protocol stack structure, frame format, address allocation, fragmentation and reassembly, packet header compression, etc., At the same time, I find that the integration problems between the WSN and IPv6network can be solved by the transplantation of the Contiki operating system and the uIP on WSN nodes, in the process of study and research on the Contiki operating system (including Contiki operating system, system architecture, main features, the process operation and communication protocol stack, etc.), then discuss and choose the the gateway access methods and also the CC2530as the hardware’s chip, transplant the Contiki OS and uIP communication protocol stack on the CC2530nodes which are based on Contiki, and test the Rime communication, UDP communication, and design a web site program. Finally, build a reasonable test environment for the design, experimental, test, and analyzed the results.