Optimal transmission range for V2I communications on congested highways

In this paper, we analyze the performance of vehicle-to-infrastructure (V2I) communications on a highway, in which the transmission distance between a road side unit (RSU) and a vehicle rapidly changes due to movement of vehicles. By theoretically analyzing the interference received at an RSU, we derive a closedform expression of a desired performance metric of V2I communications. Furthermore, by considering the trade-off between the interference at an RSU and the transmission range of a running vehicle, we obtain a closed-form optimal transmission-range for V2I communications. We evaluate our analysis results by conducting numerical simulations and show the effectiveness of the optimal transmissionrange.