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Wednesday, 17 October 2012 00:00

FOTsis project finalises its communications architecture

After months of intensive work and preparation, the FOTsis project has completed its communications architecture, a unique showcase

for the interoperability of different entities in a complex but realistic ITS deployment scenario.

The Challenge


One of the most important and difficult milestones of any FOT is to set up a communications framework which complies with regulatory standardisation requirements. The challenge for FOTsis has been no less significant. FOTsis includes seven distinct services and a much bigger number of use cases related to them. These services cover a wide range of user’s requirements and needs, and they pose therefore a challenging but at the same time realistic set of features that the FOTsis architecture has had to face and meet.


 

 

The Conceptual framework

The conceptual framework of the FOTsis architecture is the ETSI ITS Station.  It integrates the concepts necessary to help bring to life the general idea of Cooperative Systems into a set of modules covering a whole communications and applications stack and which, as a whole, will provide the capabilities to meet the requirements of Cooperative Systems and Services.


FOTsis has fully taken into account all the possibilities of the ITS-Station considered in the corresponding ETSI standard, and is thus a unique showcase for the interoperability of different entities in a complex
but realistic ITS deployment scenario, comprising a Control Centre, a number of Service Providers, the relevant ITS entities in the road operator infrastructure (namely, the Road Sides Units) and finally the user’s vehicle on-board entities.

 

The Communications architecture (see image above)

The general FOTsis architecture deployment model can be seen in the following figure. While it can look relatively complex, the main ideas are that road users will always be connected to the road infrastructure through long range 3G connections or through short range links over 802.11p with the road side units. Long range, wide area links can provide the greater coverage, at the expense of longer latency times, while short range links provide selective coverage to road vehicles and tighter latency time control.

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