Car-to-X Test Systems
Qosmotec Software Solutions GmbH
Wireless Communication Technology is finding its way into automotive industry – not only for entertainment purposes, but for security and safety reasons: With Car-to-X technology, drivers shall get information that other vehicles and road side facilities already have, for example, in case of a traffic jam ahead, a slippery road behind a curve or a necessary change of the traffic lane because of road constructions.
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Car-to-X Signal Strength Emulator
Qosmotec Software Solutions GmbH
QPER-C2X is a special adaptation of the signal strength emulator QPER, designed for mobile and Vehicular Ad-hoc Networks (MANet and VANet). Every radio devices in such an infrastructure-less network acts as a sender, receiver, and forwarder (router). Therefore, the ports of the QPER-C2X hardware are fully connected with each other by dynamically controllable attenuators. The system is fully designed for frequencies up to 6 GHz, since wireless communication for Intelligent Transport Systems (ITS) is based on the WLAN standard IEE 802.11p from 5.850 MHz to 5.925 MHz. The connected ITS stations can be either on-board units, as they are built into cars, or road side units that are used by road infrastructure (traffic lights, road work area delimiters, velocity signs). For tests in the lab, radio modules of such ITS stations are each kept in a shielding box that prevents any unwanted radiation over the air.
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Car-to-X Test Bench
Qosmotec Software Solutions GmbH
The QPER-C2X adaptation, that emulates signal strength between radio devices for Car-to-X communication in the lab, can be combined with the test automation software CANoe from Vector Informatik to enable a fully automated lab test under realistic radio conditions. This combination can be regarded as full test bench setups for Car-to-X test laboratories.
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Channel Load Generator
802.11p
Qosmotec Software Solutions GmbH
When many cars are equipped with 802.11p communication technology, high traffic density will also cause significant load on the radio channel. From normal wireless communication systems it is a known problem, that many users can cause a complete breakdown of the network. Car-to-X communication technology tries to protect itself against those kind of breakdown by a carrier sensing mechanism: Each communication device has to check first, if the radio channel is busy. In that case, it waits for a random delay to avoid packet collision on the radio channel, which causes a loss of both collided packets.
