5 research outputs found
A Hardware-in-the-Loop Evaluation of the Impact of the V2X Channel on the Traffic-Safety Versus Efficiency Trade-offs
Vehicles are increasingly becoming connected and short-range wireless
communications promise to introduce a radical change in the drivers' behaviors.
Among the main use cases, the intersection management is surely one of those
that could mostly impact on both traffic safety and efficiency. In this work,
we consider an intersection collision warning application and exploit an
hardware-in-the-loop (HIL) platform to verify the impact on the risk of
accidents as well as the average time to travel a given distance. Besides
including real ITS-G5 compliant message exchanges, the platform also includes a
channel emulator with real signals. Results show that the risk of collisions
can be drastically reduced, with an overall trade-off between safety and
traffic efficiency. At the same time, it is shown that the presence of real
channel conditions cannot guarantee the same condition of zero-risk as with
ideal channel propagation, remarking the importance of channel conditions and
signal processing
Survey and Perspectives of Vehicular Wi-Fi versus Sidelink Cellular-V2X in the 5G Era
The revolution of cooperative connected and automated vehicles is about to begin and a key milestone is the introduction of short range wireless communications between cars. Given the tremendous expected market growth, two different technologies have been standardized by international companies and consortia, namely IEEE 802.11p, out for nearly a decade, and short range cellular-vehicle-to-anything (C-V2X), of recent definition. In both cases, evolutions are under discussion. The former is only decentralized and based on a sensing before transmitting access, while the latter is based on orthogonal resources that can be also managed by an infrastructure. Although studies have been conducted to highlight advantages and drawbacks of both, doubts still remain. In this work, with a reference to the literature and the aid of large scale simulations in realistic urban and highway scenarios, we provide an insight in such a comparison, also trying to isolate the contribution of the physical and medium access control layers