Improved AODV Routing Protocol Based on Restricted Broadcasting by Communication Zones in Large-Scale VANET.

The performance of traditional AODV protocol will be sharply decreased in the scenario of large-scale VANET, which covers a wide range geographic space and contains a huge number of vehicles. This paper proposes an improved AODV routing protocol based on restricted broadcasting by communication zones for data transmitting in large-scale VANET. The whole network is divided into several communication zones according to the spatial distribution characteristic of inter-vehicle communication connectivity probabilities of road sections. The connectivity performance of the communication zone is evaluated using the grey correlation analysis method, in which both the historical and forecasting connectivity probabilities of road sections are considered. Following the maximum grey correlation degree principle, a series of key communication zones is selected to construct a restricted broadcasting area for route discovery in AODV. In the paper, the simulation scheme for the proposed AODV protocol in large-scale VANET scenario is also presented. Simulation results show that, compared with traditional AODV, the proposed improved protocol has advantages in packet delivery fraction, overhead and route setup time. [ABSTRACT FROM AUTHOR]