Application of Near Field Informatics System in Vehicle-to-Vehicle Communications and Platform of Telematics

Intelligent transport systems use real-time information dissemination to improve road transportation and traffic efficiency, and thereby alleviate the condition of traffic congestion and enhance safety. The current traffic information dissemination still relies on the CMS, broadcasting system and pre-trip travel imformation, however travelers are not often received the true real-time traffic information when they are on the road. In view of this, using vehicle-to-vehicle communication technologies in traffic become one of developmental mainstreams. Vehicle-to-vehicle communication network can be regarded as a special form of ad hoc wireless network, also known as the VANET (Vehicle Ad-hoc Network). This thesis uses Near Field Informatics system in vehicle-to-vehicle communication and set related protocol to the development of information dissemination platform. Moreover, this thesis uses IEEE 802.15.4 transmission technology and a similar radar-searching method, which utilizes dynamic power to search neighboring nodes, so that traffic information can be disseminated efficiently. The routing protocal has no fixed routing, without maintaining the routing and limited transmission of the three major characteristics. In order to reduce the number of packets, messages have been received for the node will no longer receive the same information, and don’t participate in transmission to avoid the problem of broadcast storm. As the packet transmission have no specific routing, the transmission task will give to the node which relative distance from the sending node, so nodes don’t have to exchange large numbers of control packets to determine the transmission node. This thesis classifies information which be required for vehicles on the road, and considers the priority level to decide the order of dissemination. Information dissemination can be a source of traffic management center, road side units and even a vehicle. The thesis in preliminary experiments to verify the system can be used in information dissemination, also can send forward and backward, and has a very low loss rate, therefore, requires a high degree of reliability can be applied to the safety message dissemination. Experiments have shown that this system can achieve the basic functions of vehicle-to-vehicle communication.