Abstract
Majority of research contributions in wireless access in vehicular environment (WAVE)/IEEE 802.11p standard focus on life critical safety-related applications. These applications require regular status update of vehicle’s position referred to as beaconing. Periodic beaconing in vehicle to vehicle communication leads to severe network congestion in the communication channel. The condition worsens under high vehicular density where it impacts reliability and upper bound latency of safety messages. In this paper, WAVE compliant enhancement to the existing IEEE 802.11p protocol is presented which targets prioritized delivery of safety messages while simultaneously provisioning the dissemination of nonsafety messages. Proposed scheme relies on dynamic generation of beacons to mitigate channel congestion and inefficient bandwidth utilization by reducing transmission frequency of beacons. Through the use of clustering mechanism, different beaconing frequencies and different data transmission rates are assigned to prioritize vehicular mobility. Through extensive simulation results, the performance of the proposed approach is evaluated in terms of a wide range of quality of service (QoS) parameters for two different transmission ranges. Results show that the proposed protocol provides significant enhancement and stability of the clustered topology in vehicular ad hoc network over existing standard and other protocols with similar applications.
Highlights
Vehicular ad hoc network (VANET) in recent years has emerged as a promising wireless network technology for academia, research community, and industry to support a wide range of applications ranging from travel safety to traffic management and navitainment
We propose a mobility aware clustering based medium access control (MAC) protocol that is built on a time division multiple access (TDMA) configuration
Whereas the performance of DMMAC is better than IEEE 802.11p and D-FPAV, it is much below the proposed protocol
Summary
Vehicular ad hoc network (VANET) in recent years has emerged as a promising wireless network technology for academia, research community, and industry to support a wide range of applications ranging from travel safety to traffic management and navitainment (navigation and entertainment). Intersection collision warning, lane merge warning, lane change alert, precrash sensing, traffic violation alert, and road condition alert are some examples These applications have real-time constraints, timeliness being the prominent one [3]. The inherent features of vehicular networking such as high speed, intermittent connectivity, and frequent topological changes lead to special issues and challenges in the network design, especially at the medium access control (MAC) layer. One such issue in VANET that has yet not been addressed convincingly is how the nodes should share the radio resources in order to ensure optimum quality of service (QoS) especially for safety assurance. Information inside a beacon may include vehicle’s location, speed, moving direction, and other driving/topographical information [4]
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