Vehicular Delay-Tolerant Networks

—There are problems of low delivery radio and high transmission delay in Vehicular Delay-Tolerant Networks (a.b. VDTN. To address these problems, this paper proposes a Vehicular Delay-tolerant Network routing algorithm based on Contention (a.b. VDNC). VDTN algorithm consists of three strategies: the intersection selection strategy based on the Manhattan distance and traffic information, the first competitive strategy based on the direction of movement and the second competitive strategy based on the position information. Moreover, traffic light also plays an important role to ease traffic congestion and reduce transmission delay. So an Adaptive Traffic-light Control algorithm based on GreenComputing (a.b. ATCG) is proposed. ATCG algorithm involves the following two parts: the calculation of the optimal sequence and that of the recommended speed. Simulation results show that compared to other traditional DTN (Delay-Tolerant Networks) protocols, VDNC algorithm has a higher delivery rate and lower transmission delay. And meanwhile, ATCG algorithm enables vehicles pass through the intersection with fewer stoppages and shorter waiting time. At the same time, the carbon dioxide emission is also able to achieve a minimum for the purpose of environmental protection. Consequently, the collaboration between VDNC and ATCG can further improve the traffic efficiency in VDTN.