Intelligent Transportation Systems (ITS) have only recently discovered the exciting possibilities in the nomadic and ubiquitous computing space to build a new generation of information systems by allowing the vehicle to act both as a carrier and consumer of wireless (and thus omnipresent) information. Wide deployment of such ITS systems may eventually allow for more dynamic and efficient transportation systems, which can contribute in several ways towards greater economic growth whilst respecting environmental sustainability. A great number of researchers have dedicated considerable time and resources to tackling traffic related issues by utilising the new wireless capabilities enabled by ITS; such initiatives cover a wide range of applications such as safety, knowledge sharing and infotainment. Indicative of the extent of such efforts is the plethora of research projects initiated by many national and multi-national organisations such as the EU Framework Programme for Research and Technological Development. To achieve their goals, proposed solutions from such organisations depend on the development and deployment of intelligent wireless mobile communication systems, where data dissemination issues make the prospect of efficient and effective communication a challenging proposition. Presently, Car-to-Car and Car-to-Infrastructure communications are two distinct avenues that make possible efficient and reliable delivery of messages via direct radio links in traffic areas. In all cases, high quality of communication performance is desirable for a communication system composed mostly of roaming participants; such a system needs to be dynamic, flexible and infrastructure-less. Consequently, Mobile Ad hoc Network (MANET)-based networks are a natural fit to ITS. This thesis establishes a new Collaborative MANET-based Communication Network (CMCN) architecture for the generation and control of distributed collaborative real-time information. In urban traffic scenarios, CMCN nodes are classified as mobile, semi-mobile and static according to their mobility patterns. For a CMCN system, a novel supporting Probabilistic Traffic Message Delivery Algorithm (PTMDA) is designed based on the broadcast characteristics of 802.11p. PTMDA features a set of probabilistic priority events that satisfy efficient and reliable inter-vehicle communications. Further, PTMDA is extensively compared to several existing broadcasting-based routing protocols in realistic urban scenarios based on actual traffic traces from a major metropolitan centre in the UK. The simulation results illustrate that the new routing mechanism and its message dissemination mechanisms enable lower end-to-end delay, larger reachability and higher ratio of successful message transmissions than other state-of-the-art approaches.
| Identifer | oai:union.ndltd.org:bl.uk/oai:ethos.bl.uk:629319 |
| Date | January 2013 |
| Creators | Li, Y. |
| Publisher | Nottingham Trent University |
| Source Sets | Ethos UK |
| Detected Language | English |
| Type | Electronic Thesis or Dissertation |
| Source | http://irep.ntu.ac.uk/id/eprint/35/ |
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