With the development of 5G, the Internet of Vehicles (IoV) evolves to be one important component of the Internet of Things (IoT),\nwhere vehicles and public infrastructure communicate with each other through a IEEE 802.11p EDCA mechanism to support four\naccess categories (ACs) to access a channel. Due to the mobility of the vehicles, the network topology is time varying and thus incurs\na dynamic network performance. There are many works on the stationary performance of 802.11p EDCA and some on real-time\nperformance, but existing work does not consider real-time performance under extreme highway scenario. In this paper, we\nconsider four ACs defined in the 802.11p EDCA mechanism to evaluate the limit of the real-time network performance in an\nextreme highway scenario, i.e., all vehicles keep the minimum safety distance between each other. The performance of the model\nhas been demonstrated through simulations. It is found that some ACs can meet real-time requirements while others cannot in\nthe extreme scenario.
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