On the Connectivity of Vehicular Ad Hoc Network Under Various Mobility Scenarios

Abstract

In this paper, a new mobility metric called generalized speed factor (GSF) is proposed by extending the existing speed factor, which assumes that all vehicles have the same speed at all times. The GSF defines an actual relationship between the inter-vehicle spacing and the relative speed of consecutive vehicles. The vehicle connectivity in three different mobile environments based on GSF is analyzed, i.e., temporal static connectivity, low mobility connectivity, and high mobility connectivity. It is shown that the connectivity probability Pc is directly proportional to the mean velocity μv up-to a specific threshold μτ, and after μτ the connectivity starts going down. Finally, network connectivity is extended to the best route selecting metric for the most strongly connected route. Simulation results show that a congested network is strongly connected as compared with sparse vehicular ad hoc network.

Keywords

• Connectivity model
• inter-vehicle spacing
• freeway highway
• generalized speed factor
• best route
• most strongly connected