Abstract
Effective information dissemination constitutes the cornerstone of communication in Vehicular Ad hoc Networks (VANETs). Avoiding broadcast storm is one of the considerable challenges in the development of an effective dissemination scheme for VANETs, which leads to extensive rebroadcasting. Reliable emergency messages delivery is another substantial measure of performance, especially in dense traffic and high mobility scenarios. A generic solution to deal with these problems is to cluster vehicles, so that emergency messages can be re-broadcasted to adjacent clusters only by a smaller number of vehicles. Thus, reliable selections of cluster head and relay nodes are important to reduce the number of retransmissions. In this regard, we propose a clustering technique for Reduced Broadcast Overhead Scheme for Emergency Message Dissemination (RBO-EM). RBO-EM is based on the mobility metrics to strengthen the cluster formation, avoid communication overhead and maintain the message reliability in a high mobility scenario. Moreover, we introduce relay nodes based on estimated link stability to limit the number of retransmissions. RBO-EM is evaluated against eminent schemes by varying traffic densities and speed. Simulation results indicate that RBO-EM enables a reasonable performance gain in terms of coverage, end-to-end delay and message reliability.
Highlights
The results indicate that our proposed scheme outperforms TBEM, Distributed Vehicular Broadcast (DV-CAST) and flooding in terms of endto-end delay, coverage information, network overhead, and message reliability
PERFORMANCE EVALUATION we evaluate the performances of the proposed RBO-Emergency Messages (EMs) scheme using multiple vehicular traffic simulators, namely, Simulation of Urban Mobility (SUMO), Mobility Model Generator for Vehicular Networks (MOVE), and ns2
We have developed a clustering scheme based on mobility metrics to form stable clusters and select cluster heads
Summary
Broadcast storms are triggered in VANETs due to high-traffic volumes, where each vehicle has the right to retransmit data packets simultaneously within the network Such data dissemination techniques are based on flooding that results in redundant data transmissions. Vehicular clustering has a number of open challenges, such as mobility and vehicle distribution, overhead in clustering process as well as the signal fading from neighboring vehicles and other obstacles [13], [14] To address these challenges, this article presents a novel reduced broadcast overhead scheme, called RBO-EM, for emergency message dissemination in VANETs. B. The vehicles deliver data to their cluster head for further dissemination within a cluster and, to maximize the coverage area and reduce end-to-end delay, the farthest vehicle based on Estimated Link Stability (LS T ) can be used to rebroadcast the message.
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