Vehicular Ad Hoc Networks (VANETs) are getting more popularity due to the potential Intelligent Transport Systems (ITS)\ntechnology. It provides many efficient network services such as safety warnings (collision warning), entertainment (video and\nvoice), maps based guidance, and emergency information. VANETs most commonly use Road Side Units (RSUs) and Vehicle-to-\nVehicle (V2V) referred to as Vehicle-to-Infrastructure (V2I) mode for data accessing. IEEE 802.11p standard which was originally\ndesigned forWireless Local Area Networks (WLANs) is modified to address such type of communication. However, IEEE 802.11p\nuses Distributed Coordination Function (DCF) for communication between wireless nodes. Therefore, it does not performwell for\nhigh mobility networks such as VANETs. Moreover, in RSU mode timely provision of data/services under high density of vehicles\nis challenging. In this paper, we propose a RSU-based efficient channel access scheme for VANETs under high traffic and mobility.\nIn the proposed scheme, the contention window is dynamically varied according to the times (deadlines) the vehicles are going to\nleave the RSU range.The vehicles with shorter time deadlines are served first and vice versa. Simulation is performed by using the\nNetwork Simulator (NS-3) v. 3.6. The simulation results show that the proposed scheme performs better in terms of throughput,\nbackoff rate, RSU response time, and fairness.
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