An End-to-end communication architecture for intelligent transportation systems: design, implementation and latency analysis

2018
Bağcı, Çağatay
Vehicle to anything (V2X) communication is a very significant component of Intelligent Transport Systems (ITS) applications. This thesis proposes an application layer communication architecture, ITSVeCon for V2X communications which enables communication among the end-hosts which can be vehicle Electronic Control Units (ECU)’s, Road Side Units (RSU)s, computers, smart phones or third party service providers. All these end-hosts are bi-directionally connected to the ITSVeCon Server where this server carries out application layer switching realizing unicast or multicast communication. The architecture consists of a layered software and network protocol stack with message formats and rules, which are implemented in the end-hosts and the ITSVeCon server. To this end, this thesis presents the ITSVeCon realization on the vehicle On Board Unit (OBU) and the ITSVeCon server. The OBU realization further fulfills the gateway functionality between the in-vehicle CAN network and the Internet. The ITSVeCon implementation features WebSockets carrying messages in JSON format, Publish and Subscribe pattern and NTP synchronization to enable V2X communications for real time ITS applications. To this end, the proposed architecture allows the seamless running on different ITS applications on different types of host devices. This thesis proposes the cellular communications as the wireless communication technology for the vehicle. To this end, the end-to-end communication path in ITSVeCon consists of cellular access and IP core network over multiple nodes and network segments. A very important contribution of the thesis is the measurement set-up, detailed experiment scenarios and measurement results of the end-to-end delay components. The measured end to end delay values are close to 100 ms with embedded component delays under 4 ms and large cellular network access delay under 3G network. Hence, a complementary short range wireless interface is proposed in this thesis as the second option to improve communication and functional tests of this option is carried out. With the improvements in technology, around 10 ms end to end delay value can be achieved with 4G and 1 ms end to end delay value is expected to be accomplished with 5G.

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Citation Formats
Ç. Bağcı, “An End-to-end communication architecture for intelligent transportation systems: design, implementation and latency analysis,” M.S. - Master of Science, Middle East Technical University, 2018.