A Data Transmitting Scheme Based on Improved AODV and RSU-Assisted Forwarding for Large-Scale VANET

The large-scale VANET implies the network which covers a wide range of geographic space and contains a huge number of vehicles in urban scenario. The performance of traditional data transmitting protocols will be sharply decreased in such networks. In this paper, we propose a new data transmitting scheme based on improved AODV and RSU-assisted forwarding. On the premise that a certain number of RSUs are deployed in the network, the coverage area which has the highest average connectivity of each RSU is recognized using the improved watershed algorithm. The proposed data transmitting scheme includes three parts: source vehicle to RSU (SV2R), RSU to RSU (R2R) and RSU to destination vehicle (R2DV). The SV2R and R2DV are achieved using the improved AODV protocol based on restricted broadcasting. The R2R is achieved by backbone network. Simulation results show that, compared with the AODV protocol, the proposed method can significantly improve the performance in packet delivery fraction and overhead.