The broadcast storm problem in a mobile ad hoc network
MobiCom '99 Proceedings of the 5th annual ACM/IEEE international conference on Mobile computing and networking
Vehicle-to-vehicle safety messaging in DSRC
Proceedings of the 1st 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
Quality-of-service in ad hoc carrier sense multiple access wireless networks
IEEE Journal on Selected Areas in Communications
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In the high-speed mobility environment of Vehicular Ad-hoc Networks (VANETs), frequent out-of-range failure transmissions due to the change of relative speeds may decrease the reachability of safety message broadcasting. In this paper, we derive the failure transmission probability for Directional Broadcast (DIB) protocol to investigate the effects of relative speed between the sender and the receiver on out-of-range failure transmissions. We then propose the Enhanced Directional Broadcast (EDIB) based on DIB protocol to reduce the occurrences of failure transmissions. In EDIB protocol, when we select the vehicles to rebroadcast warning messages, we pick the farthest vehicle from the vehicles that could receive warning messages completely with high probability according to the relative speeds between the sender and the receiving vehicles. Besides, we utilize the Distance Defer Transmission (DDT) protocol to reduce the relay vehicle selection time during multi-hop broadcasting transmissions. We also conduct simulation experiments to show the performance of EDIB protocol compared with DIB. Our results indicate that although the number of relay operations in our EDIB protocol is higher than that in the DIB protocol, EDIB outperforms DIB in terms of the transmission reachability, the single-hop transmission time, and the relay vehicle selection time.