Multihop safety message broadcasting in VANET: A distributed medium access mechanism with a relaying metric

Abstract

Vehicular Ad-hoc Networks (VANET) offer promising solutions towards infrastructureless collaborative active safety of the road vehicles. Active safety related data dissemination in vehicle-to-vehicle (V2V) communication requires reliable and real-time transmission. Broadcasting and relaying safety messages to alert the surrounding vehicles about critical driving situations is considered to be timely reaction. Real-time, collision-free and cooperative media access control (MAC) protocols need to be enhanced to guarantee single and multi-hop data dissemination in the vehicular networks. In this paper, media access mechanism for efficient multihop broadcasting is presented. A relaying metric is embedded in the vehicular nodes to assure self-organizing, fast reacting and collision-free medium access mechanism. Two different MAC protocols are studied. The first protocol uses periodical beaconing messages exchanged among the individual nodes and the second protocol does not require those beaconing messages. For both of the cases, the distributed relay-competition and adaptive back-off schemes are simulated on multilane dense traffic. Network simulator (ns-3) simulation results are used to compare the two protocols with and without beaconing messages versus their success rates and network connectivity. To enhance applicability of the protocols, positioning of the vehicular nodes are assumed to be subject to GPS drift and instead of precise position information, sector value is considered.

Hybrid‐Vehfog: A robust approach for reliable dissemination of critical messages in connected vehicles

“…Performance of their approach was evaluated using three different Events of Interests. Pekşen and Acarman proposed a protocol that computes the distance between the sender and recipient based on the speed of the vehicles and channel availability. Based on this, information messages are relayed from the sender to a targeted vehicle.…”

“…Moreover, the authors evaluated beacon message size and transmission frequency and found that delivery delay increases linearly based on the packet size of beacon messages. Pekşen and Acarman discussed relaying beacon messages among individual nodes. The individual nodes can function as an ordinary node or relay node based upon the transmitted message.…”

“…Most of the approaches discussed earlier are using a multihop technique or beaconing or the vehicular cloud to disseminate critical messages to near‐by vehicles. However, limitations of the techniques from other works include a high packet error rate, a high transmission delay, and the retransmission of messages, and the shortcomings of the works of Shakeel et al and Allouche and Segal involve routing overhead and a high packet loss rate.…”

A Novel Scheme for Large-Size Data Block Transmission in Vehicular Ad Hoc Networks: Architecture, Challenges and Discussions

“…To simplify the routing process, street maps are used in the routing path building process in the Directional Greedy Routing (DGR) [8]. Three other important categories are topology-based routing [14]- [19], broadcast-based routing [20]- [23], and cluster-based routing [24]- [30]. Topology-based routing protocols such as Ad hoc On-Demand Distance Vector (AODV) [14], Destination Sequenced Distance Vector (DSDV) [17], and Dynamic Source Routing (DSR) [18] are famous topology-based routing protocols for mobile ad-hoc networks (MANETs), although they are not suitable for urban VANET environments.…”