ViFi: Vehicle-to-Vehicle Assisted Traffic Offloading via Roadside WiFi Networks

Offloading vehicular data traffic from cellular networks to roadside WiFi networks is a very interesting issue since it can not only alleviate the traffic congestion for cellular networks, but also reduce the communication cost for vehicle users. In this paper, we study the vehicle-to-vehicle (V2V) assisted WiFi offloading, where nearby vehicles that associate to different access points (APs) can use their idle WiFi resource to offload part of peer's data traffic. We also consider the Internet access delay introduced by the network detection, user authentication and network address assignment between the vehicle and the AP prior to actual data transmission, which has impact on the WiFi cell sojourn duration of the vehicle. The offloading efficiency, which is the traffic offloaded from cellular network, is analyzed by modeling an M/G/1/K queueing process under various conditions. The accuracy of our analysis is validated through the conducted simulation.