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TECHNOLOGY V2X communications


“For the successful implementation of the project, it is essential to have a collaborative partner from the automotive industry for testing and implementing prototype before deployment”


in Istanbul, it is guaranteed that drivers traveling at a constant speed meet green lights as they travel along the corridor. The systems explained above are


deployed throughout the congested streets of Istanbul with varying degrees of success but there is a need for further adjustments to be made for influencing driver behaviour. In this sense, a need for establishing an intelligent communica- tion infrastructure emerges that involves vehicles talking with the infrastructure and vice versa, within the range of one another. In addition to this, the exten- sive use of smartphones in recent years and the development of a vast number of applications for these amplify the neces- sity for involving the drivers and also pedestrians in the process. However, there are some factors that


need to be taken into account, such as the geographical zone structure of the location leading the deployment of the system to be specific for each city.


METHODOLOGY The project is based on exchanging proc- essed data between vehicles, also covering communications between vehicles and the infrastructure. Within the system, vehicles are modelled as moving objects, while infrastructure is considered as constant points with predefined coordi- nates. However, these points may have variable messages to share with vehicles. Exchanged data contains the coordinates of both sides tagged with IDs, alert mes- sages such as speed, violation or fore- casted collision alert, infrastructural data such as signal duration and signboard information. 802.11p standard protocol by IEEE enables wireless access to the physical surroundings of a vehicle. This standard is specifically targeted for appli- cations in vehicular environments and hence it will be employed in this project.


58 A variety of V2X systems have been implemented to help ease congestion in Istanbul, as evidenced above The proposed system addresses the


following three use-cases to be imple- mented in Istanbul as the pilot region:


V2X – On-board notification System: This use-case aims to exchange vehicles’ location, speed and direction data with other vehicles and infrastructure over 802.11p protocol. • Displaying the signal data and speed limits through an on-board device especially on vehicles travelling with the green wave,


• Implementing preemption for emer- gency and public transport vehicles,


• Notifying the driver on violations, such as red light and speed violations are the major objectives in this use-case.


Vehicle Collision Avoidance Warning: This involves notifying drivers about any


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potential collision by retrieving nearby vehicles’ relative traffic data over 802.11.p and processing it with a decision-making algorithm.


Individual Roadside Information: The information will be available not only for drivers but also for pedestri- ans, by developing a mobile application for displaying the mobility data received from a data centre. For instance, the proposed system is expected to notify a pedestrian about the time duration of traffic signals on a smartphone while crossing the street. Displaying the avail- able nearby car parks and parking spacess while approaching a city would be another example for this use-case. A variety of channels may be used to con- vey the information to the driver who is traveling along the motorway. An


Vol 8 No 2 Europe/Rest of the World


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