Data Forwarding at Intersections in Urban Bus AdHoc Networks

The fast movement of vehicles and the intermittent connections affect the transmission efficiency in vehicular networks. Considering the regularity of bus routes and departure interval, we utilize buses to improve transmission reliability. This paper focuses on data forwarding at intersections in urban bus ad hoc networks. The traffic information is collected and aggregated by the cluster heads on road segments, and the bus density and the road connectivity are computed accordingly. Then these two parameters as well as the bus line coverage and the path distance are combined to calculate the forwarding priority of a direction at the intersection. Finally, the direction with the highest priority is selected to forward data. Since the direction selection utilizes the real-time traffic information, the feature of bus lines and the road map, the data transmission is enhanced. The simulation results with real road map and bus lines show that our scheme achieves a high delivery ratio and a short delivery latency.