Development And Research On Bluetooth Wireless Networking Technology For Cooperative Vehicle Infrastructure Environments

As an important subsystem of ITS, Cooperative Vehicle Infrastructure System(CVIS) is considered as one of the effective means to improve the reliability and security of road traffic and reduce environmental pollution. In recent years, the rapid development and application of electronic information and wireless communication technology promotes the development of CVIS, and the effective wireless communication network is the key to realize CVIS.The research content of this article is researching and developing the wireless Bluetooth network for the CVIS. By the analysis and comparison of the short distance wireless communication technologies, which are commonly used in the CVIS, Bluetooth technology is proposed to form a wireless communication network and realize the CVIS. Through studying the current situation and common algorithm of Bluetooth network at home and abroad, the feasibility of bluetooth network is analyzed.This thesis designs and develops the Host Node Smart Road Stud(HNSRS), the Slave Node Smart Road Stud(SNSRS) and the Network Collector(NC) based on Bluetooth communication by studying the BLE protocol, taking the BLE software development kit, provided by Texas Instruments, as the software platform and the Smart Road Stud and its core module CC2540 as hardware platform. The research realizes the data acquisition and data transmission of Smart Road Stud and the data collection of NC, then builds wireless Bluetooth network facing the application in CVIS–a star network which takes Network Collector as host node and Smart Road Stud as slave node. Furthermore, this paper designs a kind of bridge node that formed by two Slave Node Smart Road Stud, communicatinge by SPI internally. Based on this, the article also devises the Bluetooth linear scattering network facing the application in CVIS.In addition, this paper designs the PC software to realize the function of data analysis and reveal from Network Collector, constructs performance test on wireless Bluetooth network combined with the test software BTool and BLE Device Monitor, provided by TI, and analyzes the coverage of piconet, time of establishing connection, data transmission rate, transmission stability and data collection of star piconet. Finally, this paper analyzes the network performance combined with the application of CVIS and proves the validity and reliability of the wireless Bluetooth network.