Centralized Framework with Ring Broadcasting for Real Time Traffic in Vehicular Ad Hoc Networks

Vehicular networks are formed by vehicles communicating in an ad hoc manner or through cellular and IEEE 802.11 base stations. Routing in vehicular networks is challenging due to highly dynamic network topologies. Previous research done has proposed the idea of Road-Based using Vehicular Traffic information (RBVT) routing. In RBVT, routes are sequences of road intersections, and geographical forwarding is used for sending packets between the intersections. This paper proposes centralized framework for real time traffic in Vehicular Ad hoc NETworks (VANETs). Already available protocols are completely distributed protocol that unicasts connectivity packets in the network to find the roadbased topology graph. This graph represents a real -time view of the roads with enough vehicular traffic to ensure connectivity between intersections and is disseminated to all nodes. Proposed framework uses a similar concept, but the road connectivity information is gathered and sent separately to a server via cellular links. The server centrally computes the connectivity graph and disseminates it to the nodes in the network. While disseminating the information broadcasting has to be done, to avoid duplicity and redundancy ring broadcasting can be done. Ring broadcasting shall improve the performance. The proposed framework is compared against existing routing protocols. Simulation results for city scenarios can show that the proposed framework performs better than the existing protocols, with reduction in end-to-end delay and increase in delivery ratio.