The scheduling algorithm in road side unit for vehicular ad hoc applications

This paper focuses on the design of communication strategies between vehicle to roadside unit (RSU). For reducing the contention probability and increasing the probability of uploading high-priority data to the RSU, the IEEE 802.11 PCF MAC protocol is used within the signal coverage rage of RSU. Based on the PCF MAC, a priority-based bandwidth request scheme is applied to increase the probability of the vehicle with high-priority data sends the bandwidth request packet to RSU. According to the bandwidth requesting, a scheduling algorithm with linear programming scheme is developed in RSU to maximize the bandwidth utilization and to maximize the success uploading ratio of high-priority data. The simulation results reveal that the proposed scheme has a good performance in term of bandwidth utilization and success data uploading ratio.