Abstract
To prevent traffic accidents, even autonomous vehicles, as well as connected cars, need to know the driving situation of other vehicles in the vicinity. In particular, in emergency situations, messages’ transmission among vehicles can face many problems such as the broadcast storm, message flooding, or message contention. Therefore, this paper proposes a topological sequence recognition mechanism that calculates the driving direction of vehicles, the geographical location and relative position associated with the driving direction, and the relative safety distance for each vehicle in connected subgroups of connected cars using the Connected Mobile Virtual Fence (CMVF) system. Thus, the proposed mechanism can alleviate issues with message dissemination as a vehicle will know the driving situations of other nearby vehicles. In addition, the proposed mechanism is found to be very effective, particularly in preventing secondary accidents due to traffic accidents in front of the vehicle so that emergency messages can be disseminated to the trailing vehicles. Finally, it is expected that the proposed mechanism will be reflected in the technology of connected cars and autonomous vehicles.
Highlights
Far, many studies and simulations to realize connected car technology have been actively conducted [1,2,3]
This paper presented a topological sequence recognition mechanism for forming a connected car-based subgroup and recognizing the geographical location and relative position according to the dynamic topology changes of the preceding or following vehicles for each vehicle in the subgroup
This paper applied this mechanism to the Connected Mobile Virtual Fence (CMVF) system and verified its efficiency by driving on a real road
Summary
Many studies and simulations to realize connected car technology have been actively conducted [1,2,3]. Connected car technology based on vehicle-to-everything (V2X) communication must be connected to other vehicles, objects, and people, but is composed of partially connected subgroups according to temporal and geographical influences such as time, location, and wireless network coverage [4] If such a subgroup is not configured, all vehicles will broadcast messages containing their state such as vehicles’ information, driving record, and path history every 10 microseconds according to European Telecommunications Standards Institute (ETSI) recommendations [5]. When such a broadcasting is executed, serious problems such as the broadcast storm [4,6], message flooding [7], or message contention occur [8].
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