Abstract
Vehicular ad hoc networks (VANETs) are kind of mobile ad hoc networks (MANETs) which are used to provide communications between mobile vehicles in urban and highway scenario. Due to special characteristics of VANETs such as dynamic topology, frequent disconnection, high vehicular speed and propagation model, designing an efficient routing scheme is one of the most important key issues. In this paper, we propose a hybrid opportunistic and position-based routing protocol in VANETs by considering parameters such as position of nodes, link quality and node density. The proposed method uses a greedy forwarding scheme, in which a sender vehicle chooses a neighbor node with the highest geographical progress to increase the least number of hops between source node and destination vehicle node. Based on opportunistic and position based strategy, the proposed scheme selects optimal candidate nodes and determines appropriate priority for transmitting data. Also, the proposed scheme determines and removes the expired nodes from the routing process. The simulation results in ns-2 indicate performance improvement in terms of packet delivery rate (PDR), throughput and end-to-end delay.
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