Gateway Research On Interconnection Of Cognitive Network And Ethernet Based On Cross-layer Cooperation

With the development of the Internet of Things,embedded devices are moving toward low power consumption,miniaturization,intelligence,and wireless connectivity,namely wireless intelligent terminals.In order to further realize the remote management of intelligent terminals,obtain the effective information collected by the intelligent terminal in real time,and achieve the interconnection between people and things,the interconnection gateway was invented.Therefore,for the sake of further realizing the goal of the Internet of Everything,the gateway was studied.The main works completed in this paper are as follows:1.A network interconnection structure is proposed to realize the interconnection between L2 cognitive network and Ethernet and achieve the goals of data forwarding,protocol conversion and management and control of remote sensor nodes.In addition,in the L2 cognitive network,a new addressing method is proposed to characterize the wireless node,which can realize fast addressing based on IP address and networking address.An address mapping scheme is set in the gateway,and the specific implementation process of the scheme is described in detail.The address mapping table is established to avoid serious redundancy and overhead caused by broadcasting in the traditional wireless multi-hop network.2.Combined with the actual application requirements,the hardware system architecture of the gateway of L2 cognitive network and Ethernet interconnection is proposed,in which the role of the L2 wireless communication module is to establish an L2 cognitive network and to receive data collected from sensor nodes in the L2 cognitive network and then send it to the DSC through the serial port.In addition,the design circuit of L2 Internet gateway is expounded,and the components selected for each module of the main hardware modules are described in detail.3.The hardware and software are interdependent.Therefore,in order to play the hardware function of the L2 gateway,the design of the software system is introduced,including the embedded TCP/IP protocol stack and the L2 wireless communication protocol.In addition,the data transmission protocol of the sensor nodes in the L2 cognitive network is briefly described.4.In order to verify that the proposed gateway is feasible and reliable,a verification platform of “Smart Park Micro-environment Data Collection” with wide application scenarios is built,the experimental environment is briefly introduced,and then the reliability and data acquisition and processing capabilities of the gateway system were tested,and the test results are analyzed carefully.