Anchor-Based Connectivity Aware Routing in VANETs

We propose a novel position-based routing protocol Anchor-based Connectivity Aware Routing (ACAR) for Vehicular Ad-hoc Networks (VANETs), which considers both buses and cars as vehicular nodes running in both clockwise and anti-clockwise directions. ACAR is a hybrid protocol, uses both the greedy forwarding approach and the carry-store-and-forward approach to ensure the connectivity of the routes. Our solution to situations, when the network is sparse and when any (source or intermediate) node left its initial position, makes this protocol better in city scenarios. We only consider Vehicleto-Vehicle (V2V) communication in which both the source and destination nodes are moving vehicles. Finally, we compare our protocol with A-STAR (one of the plausible connectivity aware routing protocol for city environment) and, the simulation results in NS-2 show that the packet delivery ratio of ACAR is better than A-STAR in all cases: either when the network is fully connected or when the network is sparse.