Vehicular Streaming Handoff Control Mechanism based on the Prediction Buffer Control

Because vehicles run in high speed environments, data transmission may be interrupted by the handoff between various roadside units (RSUs). This study focuses on the roadside-to-vehicle (R2V) network environment, and uses the dedicated short range communication (DSRC) to achieve seamless handoff control on a streaming service. To achieve this goal, each vehicle is equipped with the global positioning system (GPS) to collect the vehicular position information. Then the information will be exchanged between two ends of the communication by DSRC. According to the collected positioning information, the vehicle can estimate the link expiration time (LET) between the two communicating vehicles. Furthermore, this paper studies two cases of handoff in vehicular networks which are the non-overlapping handoff and the overlapping handoff. A simple formula is designed to calculate the vehicular total buffer size and to adjust the transmission of the data flow in these two cases. Finally, we used the network simulator to estimate the performance of our proposed mechanism. The simulation results show that can predict dynamic buffer size and achieve seamless handoff control for R2V. In addition, the completion ratio of QoS reaches 96.8% when the moving speed is 60 km/h.