A City-Scale ITS-G5 Network for Next-Generation Intelligent Transportation Systems: Design Insights and Challenges

Abstract

As we move towards autonomous vehicles, a reliable Vehicleto-Everything (V2X) communication framework becomes of paramount importance. In this paper we present the development and the performance evaluation of a real-world vehicular networking testbed. Our testbed, deployed in the heart of the City of Bristol, UK, is able to exchange sensor data in a V2X manner. We will describe the testbed architecture and its operational modes. Then, we will provide some insight pertaining the firmware operating on the network devices. The system performance has been evaluated under a series of large-scale field trials, which have proven how our solution represents a low-cost high-quality framework for V2X communications. Our system managed to achieve high packet delivery ratios under different scenarios (urban, rural, highway) and for different locations around the city. We have also identified the instability of the packet transmission rate while using single-core devices, and we present some future directions that will address that.

Agile Data Offloading over Novel Fog Computing Infrastructure for CAVs

“…As this figure is based on real-world data, we can observe that the PER does not increase smoothly, but it fluctuates. This is similar to what we observed in [17] and proves the necessity for a Fog Computing Infrastructure and the integration for RLNC principle in the ITS-G5 stack. The PER for the rest of the RSUs behaves similarly.…”

“…Each RSU has a direct link to the Fog Computing Infrastructure described above. These deployed RSUs are being used for the two phases of our field-trials, with the first one being described in [17].…”

“…By means of a logging interface, we logged all the transmitted and received RLNC-CAMs. More information about the deployed testbed, the devices we utilized and the implemented communication stack, can be found in [17]. All the simulation and experimental parameters can be found in Table I. Starting with Fig.…”

Operating ITS-G5 DSRC over Unlicensed Bands: A City-Scale Performance Evaluation

“…The HP transceivers, operating via the AR9220 chipset, require the ath9k Linux driver while the LP ones, hosting an AR5414 chipset, require the ath5k Linux driver. Both were modified accordingly to enable IEEE 802.11p/DSRC functionalities [13]. The Linux kernel modules that we modified have been summarized in Fig.…”

“…In our testbed, we built on top of a pre-existing ITS-G5 stack [13] and we implemented a beaconing interface in charge of generating CAMs. To log all these network interactions we designed two different logging interfaces.…”