Journal of Parallel and Distributed Computing - Special issue on wireless and mobile computing and communications
NeXt generation/dynamic spectrum access/cognitive radio wireless networks: a survey
Computer Networks: The International Journal of Computer and Telecommunications Networking
Optimal Channel Access Management with QoS Support for Cognitive Vehicular Networks
IEEE Transactions on Mobile Computing
Modeling and simulation of WAVE 1609.4-based multi-channel vehicular ad hoc networks
Proceedings of the 5th International ICST Conference on Simulation Tools and Techniques
Performance analysis of the IEEE 802.11 distributed coordination function
IEEE Journal on Selected Areas in Communications
Reverse back-off mechanism for safety vehicular ad hoc networks
Ad Hoc Networks
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Recently, the IEEE 1609.4 protocol has been defined to enable multi-channel operations in a vehicular environment, and to guarantee interference-free co-existence of safety-related and non-safety related applications in the same network. To meet these goals, the protocol assumes strict time synchronization among vehicles, and time/frequency separation in the Dedicated Short Range Communication (DSRC) band. However, recent studies have demonstrated that this approach might not be suitable for safety-related broadcast applications with strict Quality-of-Service (QoS) requirements. In this paper, we investigate the potentials of Cognitive Radio (CR) technology to enhance the delivery ratio of safety-related broadcast applications in a multi-channel vehicular scenario. In this research field, we propose three novel contributions: (i) we introduce an analytical model to study the delivery ratio of broadcast applications in IEEE 802.11p/1609.4 multi-channel vehicular networks, and the impact of MAC and PHY parameters on the system performance; (ii) we propose a framework to jointly decide the optimal values of the Contention Window size (CW) at the MAC layer and of the Control CHannel (CCH) bandwidth at PHY layer, so that each vehicle is able to transmit all its safety data during the CCH interval with a minimum MAC collision probability, and (iii) we discuss the framework implementation in a realistic vehicular scenario. Our on-demand bandwidth allocation algorithm utilizes vacant frequencies in the DSRC band to increase the bandwidth of the CCH, leveraging the spectrum agile capabilities offered by the CR technology. Simulation results confirm the effectiveness of our proposal in enhancing the delivery rate of broadcast applications under varying network scenarios and load conditions.