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Towards 802.11p-based vehicle-to-pedestrian communication for crash prevention systems

Vehicle-to-Pedestrian (V2P) communication can help to prevent crashes between vehicles and pedestrians by extending the detection range of participants on collision course. This can be achieved by exploiting the inherent scanning and detecting features of the communication systems. However, there are several challenges to be solved if a communication-based approach is used to detect and actively prevent possible crashes. In this paper, we first discuss these challenges and then focus on communication aspects. More specifically, the focus is on the required reliability of the system that has to ensure the successful and timely delivery of crucial messages. Therefore, we evaluate the performance of V2P communication based on safety beaconing mechanisms in a typical intersection scenario in terms of delivery ratio and channel access. Both metrics describe the current networking situation and can have significant impact on the reliability of a crash prevention system. Our results show that the required beaconing intervals for early detection can add a significant load to the network and thus the delivery of crucial messages cannot be guaranteed with the default V2P setup due to increasing channel congestion. Finally, we discuss various options to limit the congestion.