V2X TECHNOLOGY
VIA MOBILE RADIO
Vodafone is a technology supplier and responsible for the communication infrastructure in the field of mobile communications in the KoMoD project. Traffic information from vehicles is transmitted to the traffic control centers as well as traffic information from the control center to the test track.
Specifically, Vodafone is currently expanding its high-performance mobile phone network in which cars, infrastructure and other road users / test vehicles exchange information with each other. In addition to V2X technology, Vodafone will be researching the car park of the future together with RWTH Aachen University, which is equipped with NB-IOT sensors. There, cars receive information about which parking spaces are free and how to get there (routing point information). The vehicle then parks autonomously.
Cellular V2X (C-V2X)
C-V2X is a mobile phone function that allows messages to be sent depending on geographical location. A user / test vehicle receives messages when it is in the relevant geographical area, such as an accident (Accident Ahead Alarm) or an emergency call (Digital Emergency Assistant).
Examples for V2X messages in the KoMoD project
- Accident Ahead Alarm: If an accident occurs, surrounding vehicles receive a warning message (accident ahead alarm) via mobile radio (V2X). In addition, accident traffic reports are provided by city and state authorities to trigger traffic management strategies (route recommendations, activation of route control systems, closures).
- Digital Emergency Lane Assistant: Emergency vehicles trigger an alarm on the way to the scene of the accident. The road user receives the message via V2X and is instructed to form the emergency lane correctly.
VIA ITS G5
Infrastructure SWARCO
SWARCO is participating with three ACTROS control units and five associated IRS (ITS Road Side Stations) in the tests for connected and automated driving in the Düsseldorf test field. Two of the control units are responsible for controlling the access routes to the Rheinalleetunnel and, if necessary, diverting traffic when the tunnel is closed. Via the connected IRS, the vehicles already receive lane assignment and other variable traffic signs on the Rheinkniebrücke.
A third control unit for signaling the traffic lights at the youth hostel in Oberkassel transmits the current signaling status and a prediction via the IRS. Via this IRS, the control unit also receives the registration of the Rheinbahn public buses in order to limit stops to the bus stops if possible.
The IRS currently have the following range of functions with regard to their equipment:
- Time synchronization via GPS
- Communication via ITS G5 (IEEE 802.11p)
- Tunnel assistance
- Traffic light assistance
- Bus priority
The IRS of the installations at the tunnel receive and route the vehicle messages (CAM, DENM) further to the ave tunnel control center and can also broadcast warning messages from the tunnel control center (DENM) to the vehicles.
Infrastructure Siemens
To implement its own and partner use cases, Siemens Mobility has set up its platform for cooperative mobility ESCoS (Eco System Cooperative Systems) in Düsseldorf. On the one hand, this includes a cooperative center ESCoS CMS (Cooperative Management System), which is a component of the existing Siemens Mobility traffic computer Scala of the city of Düsseldorf. On the field level there are five ESCoS RSU’s (Road Side Units), which act as a link between cars / buses and infrastructure.
At the Heerdter Dreieck there is an ESCoS RSU, which determines a traffic jam warning locally and can pass it on to connected vehicles. In Friedrichstadt four ESCoS RSU’s are in operation and together with the local Siemens LSA control units they form the four cooperative intersections. Traffic light assistance, bus stop assistance and bus priority are implemented here. These applications are made possible by determining the current signal status and predicting the phase change.
