The networked car, also referred to as the Connected Car, can communicate with the infrastructure, other vehicles, pedestrians and pretty much everything that is networked by mobile communications. Audi, Huawei and Vodafone have shown four potential applications for C-V2X (Cellular Vehicle 2 X) in LTE for the MWC 2017 in Spain.
Intelligent networking of all involved units
C-V2X describes the communication of an automobile (V) with other communication subscribers (X) connected to the mobile radio network. In most scenarios this means the communication between automobiles, other road users (also pedestrians) and the infrastructure. The goal is an intelligent networking of all involved units to increase traffic safety and increase comfort. This can be achieved in the first instance by means of more information provided to the driver, but in the long term it will not only support the autonomous driving, but be a prerequisite for this.
Audi, Huawei and Vodafone are testing LTE-V2X in Spain
In the Connected Car with C-V2X, the “C” (Cellular) for LTE or in the future can also be 5G. The acronym is then modified according to the technology used to LTE-V2X or 5G-V2X. In Barcelona, Audi, Huawei and Vodafone at the Circuit de Barcelona-Catalunya have shown a Connected Car demo using LTE-V2X. The transmission of a traffic signal signal, the forwarding of a video signal from another vehicle, the warning of pedestrians at the roadside, and the direct forwarding of the information that a preceding vehicle carries out an emergency braking.
Vodafone presented the network via an LTE base station
The Audi A4 Avant was used as the forerunner, and the demo itself was shown in two Audi Q7s. The two Q7 were close to the production line, but equipped with special LTE connectivity for the demo. The factory installed LTE module of the Q7 was not used. Which additional hardware exactly in the vehicles stuck, was not visible, since no view in the trunk was granted. To the outside four antennas were visible on the roof. The demo was carried out in a frequency block at 2,600 MHz and 5.9 GHz, depending on the application, via a base station in the Vodafone network. The signal also ran through an Audi server in Ingolstadt. There was also a direct link between the vehicles.
Send traffic signal to vehicle
In the first scenario, the transmission of a traffic signal, the information is transmitted to the driver display of the Q7 that a red traffic light is imminent. This can be useful for example when the field of view is blocked by other vehicles or trucks. In a specific application, the traffic light transmits the red signal to a server in Ingolstadt, which then shares this information with the preceding Audi A4, and this vehicle, in turn, shares the information by direct link with the two Q7s, which then represent a warning to the traffic signal in the driver display.
Free field of vision thanks to video transmission
The second scenario is also to help with blocked visibility, by dividing the view of a preceding vehicle, in this case again the Audi A4, with the following vehicles, so that these have clear view of the road, even if this is for example by several trucks actually Would no longer be possible. On the dashboard of the A4, a 720p camera connected via Ethernet with the technology in the luggage compartment was installed, which feeds its signal into the LTE network of Vodafone. The signal is routed again for testing purposes via a server in Ingolstadt and finally transferred to the two Q7. Due to the long signal paths of the test set-up, this still leads to a latency of approximately 1.5 seconds, which would not be suitable for serial use.
Warn before pedestrians and brake earlier
In the case of the warning of a pedestrian on the road edge, the location information of the pedestrian, determined by a terminal device such as a smartphone, is shared with the Audi server in Ingolstadt and is shared with the vehicles participating in the demo, which then receive a corresponding message in the driver display.
Assistance systems use information from third parties
Huawei informs the other vehicles of the vehicle that an emergency braking of a preceding vehicle, in this case the Audi A4, is carried out by direct link. Their driver assistance systems are therefore prepared earlier for such a situation, even if a vehicle has not yet reacted to the emergency braking of the front man. Currently, driver assistance systems depend on the behavior of the directly preceding vehicle, while LTE-V2X also knows the car, which makes another vehicle several hundred meters ahead of the track straight.
Prerequisite for autonomous driving
What the vehicle does when and how will be an important part of the autonomous journey. In addition to the driver assistance systems in the automobile, which autonomously drive autonomously, the information gathered by vehicles in the vicinity will also be included in the calculations. These data could then be combined with information from pedestrians and the infrastructure, making driving safer and more comfortable.