Hamburg - OBU for the BiDiMoVe project
Secured priority requests
Highlights of the project
- Public transport priority system (OBUs) using SREM and SSEM messages.
- SREMs are assessed by a central system and it not targeted to a particular intersection
- Connection to a third-party board computer using IBISPlus (SOAP interface)
- SREMs are accepted by RSUs from Swarco/Yunex and correctly answered by SSEM
- Secured communication - OBU is registered in the BiDiMoVe PKI by Escrypt.
Communication with the board computer
The board computer by Trapeze communicates with the OBU using the protocol IBISPlus. The data provided are of high quality and suitable for priority control.
Priority control
Unlike the system in Brno, in BiDiMoVe the SREM does not target a particular intersection. Instead, it is sent for all RSUs in the vicinity. The SREM is filled by a data about the current trip – e.g., line number, next stop and delay. The RSU forwards the SREM to a central system. After the priority request is accepted, a SSEM is generated at the RSU and received by OBU.
Messages from RSU
V2X allows also many other services, except for public transport priority. The city of Hamburg is investing a lot to have a working and rich C-ITS system. As the vehicle with our OBU travels through the city, it receives various V2X messages. As an example, it correctly processes messages with an intersection topology (MAPEM) and signal plan of the traffic light controller (SPATEM). The result can be seen to the left: the OBU correctly localized itself to a lane of the intersection and is able to show time to green.
Transition RSU
In the middle of this year, we will deliver an RSU to Hamburger Verkehrsanlagen. Inspired in Brno, it will be so called “transition” RSU. That is, its goal is to enable public transport and emergency vehicle priority on an older traffic light controller – a controller which does not support V2X. This way, we can help in the transition phase from analogue radio to V2X.