As a new type of mobile ad hoc network, vehicle ad hoc network (VANET) is an important part of the application of smart transportation system. It has great potential in traffic accident warning, traffic flow control and providing information service and value-added services for drivers.
Ad hoc network is a wireless distributed architecture, which emphasizes the concept of multi-hop, self-organization and no center. vehicle ad hoc network (VANET) is a special form of Mobile ad hoc network (MANET). It has various characteristics of MANET, such as autonomy and no fixed structure, multi-hop routing, dynamic change of network topology, limited network capacity, good scalability and so on. However, in VANET, special application environments, such as narrow roads, high-density node distribution, high-speed node movement, directly affect its information transmission capacity, resulting in increased packet loss and delay.
The basic architecture of VANET network is mainly divided into vehicle-to-vehicle (V2V) communication and vehicle-to-infrastructure (V2I) communication. V2V communication can make the vehicle real-time monitor the relevant information of other vehicles on the road nearby, and provide a high-tech solution for driving safety and intelligent driving. V2I communication can make the vehicle know all kinds of facilities around it at any time, and provide all kinds of service information and data network access. Its communication system is generally composed of three parts: on-board unit (OBU), roadside unit (RSU) and dedicated short-distance wireless communication protocol.
(Translated from Thinktanks APP)