Hierarchical Hybrid Routing Algorithm for Urban Public Transport

Vehicles have different features in the urban environment, while the traditional VANET treats all vehicle nodes equally and does not make good use of the characteristics of vehicles in the urban environment. Therefore, according to the urban public transport situation, this paper presents a hierarchical hybrid routing algorithm. Based on the traditional AODV routing, the fixed-routine vehicles such as buses and trams are used as the high-level architecture nodes, and the data bus mode is used for data transmission. When the number of the high-level node is scarce, the cars, roadside units and other low-layer nodes will help to forward or store the data temporarily. The algorithm also details the route discovery process and data forwarding. The simulation results show that the data transmission efficiency and end-to-end delay are obviously improved compared with the traditional VANET routing algorithms.