Design And Implementation Of Wireless Station Based On Embedded Linux

Along with the constant development of information technology, computer network technology and wireless communications technology integrate wireless LAN technology. Wireless LAN is not dependent on traditional cables, providing Ethernet or Token network functions. It makes up for shortcomings of wired LAN, such as big workload of rebuilding project, easily damaged lines, not mobile network nodes, and has been widely applied in a number of special occasions.The subway is an important component of the modern urban infrastructure construction. The uniqueness of the subway operating environment determines that the computers on the train communicate with the management computer only through wireless network. Metro Wireless Communication as the only means of communication between the high-speed train and the business management, charges with improving operational efficiency, the important role of safety protection. The work of this thesis is to design and implement a software platform of wireless station for a wireless communication system in metro.Firstly, this paper briefly describes Embedded Linux and the background of the wireless station. Secondly, according to the realization of the embedded system on wireless station, it explains the hardware architecture, and explores such as dynamic memory allocation, soft interrupt handling and other key issues. Thirdly, this paper shows the realization of system software and application software on wireless station. The work include: the construction of software platform for wireless station based on Embedded Linux, the transplantation and debugging of CS8900A and BGW200's network driver based on S3C2410X, the realization of application software based on Embedded Linux for mobile node's seamless switching between different wireless networks. Finally, this paper describes the process and results of wireless station's mobile communications test. Test results showed that the wireless station satisfies the high-speed train in the mobile communication environment.