Car Communication System

3128 Words13 Pages
Safety and Security 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 deploy…show more content…
In this way, the vehicles that are actually affected by a dangerous situation or a traffic notification are Special Issue: ITS (a) Geographical Unicast (b) Geographical Broadcast (c) Topologically-Scoped Broadcast Fig. 4 Geocast schemes. notified, whereas vehicles unaffected by the event are not targeted. In summary, Geocast comprises the following forwarding schemes: ● GeoUnicast ( Fig. 4 ) provides packet delivery between two nodes via multiple wireless hops. When a node wishes to send a unicast packet, it first determines the destination’s position (by location table look-up or the location service) and forwards the data packet to the node towards the destination, which in turn re-forwards the packet along the path until the packet reaches the destination. ● GeoBroadcast (Fig. 4(b)) distributes data packets by flooding, where nodes re-broadcast the packets if they are located in the geographical region determined by the packets. This simple flooding scheme is enhanced with techniques based on packet numbering to alleviate the effects of so-called broadcast storms that are a typical problem in wireless ad hoc networks. GeoAnycast is similar to GeoBroadcast but addresses a single (i.e., any) node in a geographical area. ● Topologically-scoped broadcast (TSB) (Fig. 4(c)) provides rebroadcasting of a data packet from a source to all nodes in the n-hop
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