Accessibility for VANET in an Urban Scene

Maintaining Vehicular Ad-hoc NETwork (VANET) accessibility is a thorny challenge in an urban scene. Existing methods assume that VANET obeys the ideal distribution, and do not consider the difference of connectivity between vehicles and vehicle groups. This work models VANET accessibility globally or locally. First, it measures connectivity between two vehicles. Then, it defines four connected states of paths and removes redundant connections. Finally, it proposes a path connectivity delay calculation method and a transfer station selection algorithm. Simulation results show that our method can evaluate VANET accessibility effectively and has a shorter averaged delay and higher packet delivery rate than a greedy perimeter stateless routing algorithm.