Abstract
The dynamic network topology of the Vehicular Ad Hoc Network (VANET) directly affects network performances. The VanetMobiSim software was used to study the dynamic topology of VANET in detail. A time-varying model of VANET was built. First, the information transmission model of VANET was established on the basis of the time-varying network theory. The evolution of VANET characteristic parameters in a time-varying process was stimulated by using the information transmission time τ and the maximum tolerated delay time δ accessibility graph. Then, we perform mathematical analysis of the relations of (τ, δ) to the out-degrees, average packet accessibility, and asymmetry ratio. Finally, the relations of the node communication radius to the global efficiency and the average harmonic mean of the distances were analyzed. The results indicated that the time-varying accessibility graph made VANET information transmission more efficient; reducing the information transmission time τ or increasing the maximum tolerated delay time δ tends to bring out the improving temporal connectivity of the whole network, thus improving the efficiency of packet transmission.
Highlights
At present, autonomous vehicles are able to navigate in unpredictable actual environments without too much human feedback
In order to achieve automated cooperative driving, vehicles need to share information among them. Such information develops the performances of Autonomous Vehicles (AVs) to move forward in and enhance road safety based on decision algorithms
The major novelty is summarized as follows: (1) By utilizing a time-varying complex network, we propose a time-varying Vehicular Ad Hoc Network (VANET) model using (τ, δ) graphs based on dynamic characteristics of VANET, where τ denotes the information transmission time and δ denotes the maximum tolerated delay time
Summary
Autonomous vehicles are able to navigate in unpredictable actual environments without too much human feedback. One of the possible ways to achieve inter-vehicle communication relies on Vehicular Ad Hoc Networks (VANETs). The highly dynamic characters of such networks represent complex topological overall features due to inherent dynamics of nodes and their spatial coupling. Factors such as neighbor nodes, drivers’ decision, traffic trash, and traffic flow situation would impact the vehicle’s movement in VANET due to the limitation of nodes.. The major novelty is summarized as follows: (1) By utilizing a time-varying complex network, we propose a time-varying VANET model using (τ, δ) graphs based on dynamic characteristics of VANET, where τ denotes the information transmission time and δ denotes the maximum tolerated delay time. As the end result of the process, we conclude the paper in the last part
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