INFRASTRUCTURE & TALKING TRAFFIC

On Board Unit (OBU)

The in-vehicle subsystem, or ITS Vehicle Station, is built into the vehicles and is comprised of two units

1. The Communication Control Unit (CCU) enables wireless communication with other vehicles and with the infrastructure. It also allows access to vehicle information and implements improved vehicle positioning

2. The Vehicle Application Unit (VAU) is the actual application carrier. It implements the in-vehicle application and provides the required system components. The VAU is also connected to the so-called Human Machine Interface (HMI) device, which is responsible for driver interaction

Road Side Unit (RSU)

• More than 100 ITS Roadside Stations (IRS) installed by the Hessian traffic center and the Integrated Traffic Management Centre Frankfurt will be used to test the car-to-x communication

• 58 IRS on motorways

• 22 IRS on rural roads

• 24 IRS in the city network (connected with signal control devices)

Data Processing Hub

• The ITS Central Station is the actual simTD backend system, which provides the required services and implements the infrastructure-related parts of the applications to be developed.

• The ITS Central Station will receive information from the Hessen traffic control centre as well as from the city of Frankfurt's integrated traffic control centre.

Communication Technology

• IEEE 802.11p (ITS G5A) for V2V & V2I communication. As they require the smallest latency, the majority of information regarding security and traffic efficiency will be exchange on this line

• IEEE 802.11b/g modules, to establish, through the Road Side Units, an IP-based communication on the Internet with the Test Management Centre and other Backend services. Wi-Fi will eventually be installed to ensure the transmission of large data sets

• IP-based communication through GPRS, EDGE, UMTS or HSPA