High-integrity based cooperative file transmission at urban intersections using pure V2V communication

Abstract

Vehicular Ad Hoc Networks (VANETs) provide safety management and entertainment services in smart city scenarios. However, due to the highly time-varying network topology caused by vehicles’ movement and non-line-of-sight (NLOS) areas in complex urban environment, the connection time between vehicles might be very short, leading to limited transmission capacity between vehicles. As a result, large file transmission such as online video sharing might be unavailable. To alleviate this issue, we study high-integrity based file transmission using pure vehicle-to-vehicle (V2V) communication at urban intersections. First, we develop the analytical models to evaluate file transmission at intersections, including vehicle mobility model, connection time prediction model, and V2V communication model. Then, we derive the relationship between transmission capacity and vehicles’ mobility. Based upon this analysis, we propose a cooperative file transmission strategy for the transmitting vehicle, which helps transmit the target file to the receiving vehicle. The proposed strategy includes three phases: transmission capacity evaluation, cluster establishment, and cooperative file transmission. By taking advantage of the cluster characteristics, the strategy can achieve file transmission with high integrity. Through extensive simulations, we demonstrate the accuracy of the proposed system model which matches our analysis well, and show the effectiveness of the proposed strategy by comparing with other file transmission strategies in aspects of transmission success rate and data transmission volume.