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Car Communication System

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CAR-2-X Communication for Safety and Infotainment in Europe
Dr. Andreas Festag, Roberto Baldessari, Dr. Wenhui Zhang Dr. Long Le, Amardeo Sarma, Masatoshi Fukukawa
Abstract Vehicular communication based on short-range wireless technology opens up novel applications improving road safety and travel comfort. Ad hoc networking enables a direct communication among cars as well as between cars and road-side communication devices. Geocast is an ad hoc routing scheme which is specifically considered in Europe as a core networking concept for future CAR-2-X systems. It provides wireless multi-hop communication and allows for geographical addressing and routing. This paper describes advanced concepts and mechanisms to …show more content…

Therefore, Geocast was chosen as the core networking protocol for vehicular communication based on IEEE 802.11 technology promoted by the Car-to-Car Communication Consortium (C2C-CC) in Europe, the major European industry consortium for vehicular communication 3) . The following two sections of the paper present advanced solutions for Geocast as the core concept of CAR-2-X communication (Sec. 2) and NEC’s CAR-2-X platform (Sec. 3).

Fig. 3 CAR-2-X protocol architecture.

2. CAR-2-X Communication Technology
Basically, Geocast is an ad hoc routing protocol utilizing geographical positions for data transfer. Its basic principles were originally proposed as alternative to pure topology-based internetworking 5) and in mobile ad hoc networks 6) . Geocast assumes that vehicles acquire information about their position (i.e. geodetic coordinates) via GPS or any other positioning system. Every vehicle periodically advertises this information to its neighboring vehicles and hence, a vehicle is informed about all other vehicles located within its direct communication range. If a vehicle intends to send data to a known target geographic location, it chooses another vehicle as message relay, which is located in the direction towards the target position. The same procedure is executed by every vehicle on the multi-hop path until the destination is reached. This approach
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does not require establishment and maintenance of

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