Vehicle-to-vehicle safety messaging in DSRC
Proceedings of the 1st ACM international workshop on Vehicular ad hoc networks
Assignment of dynamic transmission range based on estimation of vehicle density
Proceedings of the 2nd ACM international workshop on Vehicular ad hoc networks
Fair sharing of bandwidth in VANETs
Proceedings of the 2nd ACM international workshop on Vehicular ad hoc networks
Reliable inter-vehicle communications for vehicular ad hoc networks
Proceedings of the 4th Annual International Conference on Wireless Internet
Design of 5.9 ghz dsrc-based vehicular safety communication
IEEE Wireless Communications
MAC for dedicated short range communications in intelligent transport system
IEEE Communications Magazine
Reliable inter-vehicle communications for vehicular ad hoc networks
Proceedings of the 4th Annual International Conference on Wireless Internet
A universal geocast scheme for vehicular ad hoc networks
CCNC'10 Proceedings of the 7th IEEE conference on Consumer communications and networking conference
Fundamental tradeoffs in vehicular ad hoc networks
Proceedings of the seventh ACM international workshop on VehiculAr InterNETworking
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Safety message exchange is the most prevalent part of inter-vehicular communications which is crucial for enhancing safety and efficiency in transportation networks. Moreover, since the dissemination of safety messages directly influences our lives, their reliable delivery is of great importance. Most packet collisions in VANETs occur due to hidden nodes. In unicast communications a two-way handshaking is performed prior to the actual transmission in order to alleviate the hidden node problem. However, this procedure congests the network with a lot of overhead in case of broadcast, which is the dominant mode of communication in VANETs. Hence, in this paper we propose an alternative solution, based on retransmissions, to ensure the reliable delivery of safety messages. We argue that the specific characteristics inherent in VANETs, such as the limited density of vehicles, anticipated bandwidth and the tolerable delay, allow us to deploy a retransmission strategy. Furthermore, We prove that our proposed scheme establishes fair channel access for the consecutive retransmission opportunities of contending neighbors. Simulation results confirm that our heuristic method dramatically improves the probability of reception of safety messages regarding conventional methods.