Patrick S. Chen, Janus Hsu,
Dept. of Information Management, Tatung University,
40 Zhongshan North Road, 3rd Section Taipei 104, Taiwan (R.O.C.) firstname.lastname@example.org, email@example.com
A messaging system supporting inter-vehicular communication is implemented to enable management of a caravan. With the help of positioning function and ad hoc network, important messages can be sent to vehicles in the caravan to regulate traffic flow, enhance driving safety and distribute alerts. We distinguish various types of broadcasting and analyze the circumstances for broadcasting. The usefulness of broadcasting is considered in which a message about an accident is more important for the vehicles behind the accidents, and the information that an ambulance is coming is more important for the vehicles before the ambulance. LAN and 3G provide a communication platform for messaging. Broadcasting, P2P communication and SMS are choices of the messaging system. A prototype of the system is implemented and its application is discussed as well.
Keyword: VANET, LBS, GPS, Broadcast Storm, P2P
Vehicle Management System is usually an integration of global positioning system (GPS), geographic information system (GIS), mobile communication system and Internet technology, providing users with valuable, real-time information. If a vehicle is equipped with GPS, important information such as current location, speed, direction, vehicle condition, etc. will be sent back to the control center. The manager is able to know oil consumption, personnel attendance, goods delivery, and anomalous state of the vehicle, and to make right decision to enhance performance. In general, a vehicle management information system provides the following functions: (1)Organization of the caravan: to update the states of the caravan and the personnel; (2)Real-time monitoring: to control the vehicles based on the latest information including the condition of the vehicle and ; (3)Retrieval of historic data: to check the current and historical operation data; (4)Statistics: to provide several statistical reports including transportation fee, over-speed records, oil consumption, mileage, etc. (5)Vehicle positioning: to facilitate query by street, milestone, administrative area and other geographical conditions; (6)Instant messaging: to broadcast message to vehicles using general mode and group mode: (7)Presentation of vehicle states: to present the current condition of a specified vehicle.
Some industries like taxi require high flexibility to offer high-quality service. The taxi drivers shuffle either in downtowns or in countries to offer fast service to guests. To know the traffic flow and accidents is of great importance for the drivers. Currently, they rely on pagers to share information within the caravan. But, this simple equipment cannot meet the requirements of advanced management. Main problems involved are unable to distribute detailed information, coverage of the pager system, exactness of the information such as location. In this paper we proposed a novel communication system for caravans with their vehicles equipped with handset to facilitate a better inter-vehicular communication.
In an ad hoc network, broadcast is used to distribute information such as emergency, actual traffic flow, business decision, even entertainment materials. Simple pager system can afford to distribute information within the caravan, but it also suffers several drawbacks like subject to noise, prone to interception, narrow bandwidth. With the development of mobile technique and smart handheld equipment we are able to provide better communication service.
There are three different types of vehicle ad hoc network (VANET): inter-vehicle communications (IVC), roadside-to-vehicle communications (RVC) and hybrid-vehicle communications (HVC). The management mode of VANET can be...