We are investigating aspects of vehicular computing, focusing on the design and implementation vehicular networking services that can provide car drivers with time-sensitive information about traffic conditions and roadside facilities.

Protocol Design

We have proposed the Vehicular Information Transfer Protocol (VITP), a location-aware, application-layer, communication protocol designed to support a distributed service infrastructure over Vehicular Ad-hoc Networks (VANETs). VITP was designed to specify the syntax and the semantics of messages exchanged between the software components of our proposed service infrastructure, which we call VITP peers. A VITP peer runs on the computing device of a vehicle, uses its IVC capabilities, and accesses the vehicle’s sensors to retrieve useful information. VITP peers establish on-demand dynamic, ad-hoc groups, which collect, communicate, and combine information from the on-board sensors of different vehicles in order to resolve incoming requests. Under an extensive simulation study, we demonstrated the viability and effectiveness of VITP in providing location-aware services over VANETs. We are currently investigating to extend the VITP architecture in order to support cache-based location aware services.
VITP


Networking Shape Analysis

VANET graph
Considering that VANETs are not static but evolve over time by additions and deletions of nodes, it is important to examine the network properties and topological statistical features that characterize the structure and behavior of vehicular networks. We are currently investigating the topological characteristics of a vehicular network, providing a thorough study of the visible and “latent” structure of a VANET. Results will stimulate interesting considerations on how network protocols could take advantage of vehicular mobility to improve their performance.

 

VANET Traffic Modelling

TrafficModeller
We have developed an open-source, graphical tool for the rapid high-level modeling and generation of vehicular traffic, called TrafficModeler. TrafficModeler supports a variety of traffic definition models representing a wide range of traffic patterns. A set of traffic generation algorithms are implemented to convert high-level models to output compatible with SUMO, a popular open-source microscopic traffic simulator. TrafficModeler drastically reduces the time and effort required to generate traffic for SUMO. Furthermore, it can be easily extended to support other traffic simulators and to incorporate new types of traffic.
  • For the latest release of TrafficModeller, source code download and support visit our SourceForge project here.

 


Publications

  • The Dynamics of Vehicular Networks in Urban Environments”. N. Loulloudes, G. Pallis, M. D. Dikaiakos. Technical Report TR-10-2, Department of Computer Science, University of Cyprus, June 2010 (available in pdf).
  • Caching Dynamic Information in Vehicular Ad Hoc Networks”. N. Loulloudes, G. Pallis, M. D. Dikaiakos. 9th Hellenic Data Management Symposium (HDMS'10), June 30 – July 3, 2010, Ayia Napa, Cyprus (accepted for publication).
  • "Caching Dynamic Information in Vehicular Ad Hoc Networks" N. Loulloudes, G. Pallis, M. D. Dikaiakos. In Proceedings of Euro-Par 2010, Ischia-Naples, Italy, Sep. 2010 (accepted for publication).
  • "On the Evaluation of Caching in Vehicular Information Systems" N. Loulloudes, G. Pallis, M. D. Dikaiakos. Poster paper in Proceedings of 11th International Conference on Mobile Data Management (MDM '10), Kansas City, Missouri, May 23-26, 2010 (poster, accepted for publication) (available in pdf)
  • "Analyzing the Structure and Evolution of Vehicular Networks." G. Pallis, D. Katsaros, M. D. Dikaiakos, N. Loulloudes, L. Tassiulas. 17th Annual Meeting of the IEEE/ACM International Symposium on Modelling, Analysis and Simulation of Computer and Telecommunication Systems (MASCOTS '09), London, UK, September 21-23, 2009 (pdf).
  • "TrafficModeler: A Graphical Tool for Programming Microscopic Traffic Simulators through High-level Abstractions," L. Papaleontiou and M. D. Dikaiakos, Proceedings of the 2009 IEEE 69th Vehicular Technical Conference (VTC '09-Spring), April 26-29, 2009. Barcelona, Spain (pdf).
  • "Location-aware Services over Vehicular Ad-Hoc Networks using Car-to-Car Communication." M. D. Dikaiakos, A. Florides, T. Nadeem, L. Iftode. IEEE Journal on Selected Areas in Communications, Vol. 25, Issue 8, Oct. 2007, IEEE, pp 1590-1602, (available online through IEEExplore).
  • "VITP: An Information Transfer Protocol for Vehicular Computing." M. D. Dikaiakos, S. Iqbal, T. Nadeem, L. Iftode. In Proceedings of the Second ACM International Workshop on Vehicular Ad Hoc Networks (VANET '05). In conjunction with ACM MobiCom, pages 30-39, September 2nd, 2005, Germany, (available in pdf).
  • "Information Dissemination in Mobile Content Distribution Networks." N. Loulloudes, G. Pallis and M. D. Dikaiakos, in Content Delivery Networks: Principles and Paradigms, R. Buyya, M. Pathan, A. Vakali (Eds.), pp. 343-366, Springer, 2008, ISBN 978-3-540-77886-8, (available online through SpringerLink).
  • "On the Evaluation of Caching in Vehicular Information Systems." N. Loulloudes, G. Pallis, M. D. Dikaiakos. In Proceedings of 11th International Conference on Mobile Data Management (MDM '10), Kansas City, Missouri, May 23-26, 2010 (poster, accepted for publication) (available in pdf).

Theses

  • "High-level traffic modeling and generation," Leontios Papaleontiou, M.Sc. Thesis, March 2008 (available in pdf).
  • "Implementation of a Vehicular Information Transfer Protocol server," Costas Anastasiou, B.Sc. Thesis, June 2008.