In intelligent transportation systems, the cooperation between vehicles and the road side units is essential to bring\r\nthese systems to fruition. Vehicular ad hoc networks (VANETs) are a promising technology to enable the\r\ncommunications among vehicles on one hand and between vehicles and road side units on the other hand.\r\nHowever, it is a challenging task to develop a reliable routing algorithm for VANETs due to the high mobility and\r\nthe frequent changes of the network topology. Communication links are highly vulnerable to disconnection in\r\nVANETs; hence, the routing reliability of these ever-changing networks needs to be paid special attention. In this\r\npaper, we propose a new vehicular reliability model to facilitate the reliable routing in VANETs. The link reliability is\r\ndefined as the probability that a direct communication link between two vehicles will stay continuously available\r\nover a specified time period. Furthermore, the link reliability value is accurately calculated using the location,\r\ndirection and velocity information of vehicles along the road. We extend the well-known ad hoc on-demand\r\ndistance vector (AODV) routing protocol to propose our reliable routing protocol AODV-R. Simulation results\r\ndemonstrate that AODV-R outperforms significantly the AODV routing protocol in terms of better delivery ratio and\r\nless link failures while maintaining a reasonable routing control overhead.
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