| Bluetooth is one of the short-distance, low-cost wireless communicationtechnologies. It was brought to replace cables between portable devices to form apersonal wireless local area network. Bluetooth can not only make it possible tocombine computer with communication technologies, but also integrate homeappliance, entertainment electric devices, computers and communication terminals.This will bring convenience in many situations such as home entertainment, officeaffairs or in some public sectors because Bluetooth can provide universal operationsand controls. In other words, Bluetooth provides us an easy approach of officeautomation and home communication. Bluetooth can be regarded as a kind of open,global wireless standard of voice and data communication technologies.File transmission technology based on the bluetooth system is a typic application,It build up the base for the bluetooth application research in future.File transmission technology based on the bluetooth system is implemented onthe basis of the protocol stack. Its software section consists of RFCOMM, L2CAP,SDP, OBEX (object exchange) and Baseband protocol. This dissertation analyses theapplication interface model of OBEX; the frame type and frame structure ofRFCOMM protocol; the event and action of change state of L2CAP and establish,configure, terminate of communication channel of L2CAP protocol; SDP provides ameans for application to discover which services are available. RFCOMM andL2CAP protocols are designed of the service registration andderegistration, connection and disconnection, sending data and so on, and the partflowcharts and steps are given. The packet format of file transmission and the codingtechniques of error correction are designed based on the analysis of the packet formatand structure of baseband.On the base of analyse of file transport mode, this paper also analyses thesecurity and security design of each protocol of Bluetooth system, and to table aproposal to the problem in security system. |
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