Ahmad Sarlak - Department of Electrical Engineering, K.N.Toosi University of Technology, Tehran, Iran
Yousef Darmani - Department of Computer Engineering, K. N. Toosi University of Technology, Tehran, Iran

Nowadays, with attention to soar in the number of network users, it is necessary to find new approaches to revolutionize network operation. Vehicular ad-hoc networks are bound to play a pivotal role in communication, therefore raising the traffic in the network, using only WiFi is unlikely to address this problem. Vehicles could use SDN and other networks such as ۴G as well as ۵G to distribute traffic to different networks. Moreover, many approaches for handling different data types are inappropriate due to the lack of attention to the data separation idea. In this paper, we proposed a control scheme called Improve Quality of Service in DTN and Non-DTN (IQDN) which works based on vehicle communication infrastructure using SDN idea. IQDN separates data to Delay-Tolerant Data (DTD), and Delay-Intolerant Data (DID) where the former buffers in a vehicle till the vehicle enters an RSU range and sends DTD using IEEE ۸۰۲.۱۱p. DID packets are sent by cellular networks and LTE. To transmit DTD via IEEE ۸۰۲.۱۱p, the network capacity is evaluated by SDN. If that network has room to transmit the data, SDN sends a control message to inform the vehicle. Simulations show that sending data over RSU and LTE increases the throughput and decreases the congestion, so the quality of service improves.

DTN; Vehicular communications; LTE; IEEE ۸۰۲.۱۱p; SDN