Rohde & Schwarz
1221 Mw Rohde Audi C V2 X Test Promo

Rohde & Schwarz, Audi Team on Cellular-V2X Road-Traffic Scenario Tests

Dec. 2, 2021
In partnering to enable C-V2X application testing, Rohde & Schwarz and Audi create road-traffic scenarios in the laboratory and use them to conduct end-to-end testing on Audi’s proving ground.

It’s hoped that cellular-V2X (C-V2X) technology will proliferate in the coming years to increase traffic efficiency, improve road safety, and enhance autonomous driving. A key element is the C-V2X PC5 interface, operating in the 5.9-GHz ITS frequency band. This PC5 interface enables direct, reliable, low-latency communications between vehicles (V2V), vehicles and infrastructure (V2I), and vehicles and pedestrians (V2P).

Getting C-V2X technology deployed, though, is going to call for more cooperation between industry players. To that end, a joint project by Audi, Rohde & Schwarz, and Vector Informatik has developed a C-V2X test solution that allows traffic scenarios involving multiple simulated vehicles and the communications between them to be tested in the laboratory in a precise and repeatable way. This enables the correct operation of C-V2X applications such as emergency brake warning in realistic and demanding traffic scenarios to be verified in the laboratory. Jointly with Audi, the laboratory solution was extended for use at the proving ground. This enabled the verification of several scenarios with one single physical vehicle and many simulated vehicles emulated by the Rohde & Schwarz test equipment.

The key benefits of this approach are the use of the same test equipment in both locations and reducing the number of vehicles required for the proving ground. This test approach allowed Audi to perform various load tests and corner-case scenarios using test vehicles and simulated vehicles together at the proving ground. The high level of cooperation between the teams facilitated co-development of this C-V2X test setup, helping to reduce time to market and saving capital expenditure.

The system comprises an R&S CMW500 wideband radio communication tester, an R&S SMBV100B vector signal generator (laboratory only), the Vector CANoe Car2x software, an R&S BBA150 amplifier, and an R&S HF918 antenna with a tripod and adapter. This system is easily capable of generating signals with up to 33 dBm of output power, which is required for emergency vehicles in certain markets. Synchronization of the simulated vehicles and the test vehicle at the proving ground with real GNSS sources allows verification of complex traffic scenarios in real time.

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