Content Distribution in Vehicular Ad-hoc Networks (VANETs) has always been a critical challenge, due to the peculiar characteristics of VANETs, such as high mobility, intermittent connectivity, and dynamic topologies. In fact, traditional Host-Centric Networks have shown to be unable to handle the increasing demand for content distribution in VANETs. Recently, Information-Centric Networks (ICN) have been proposed to VANETs to cope with the existing issues and improve the content delivery. In Vehicular Information-Centric Networks, instead of communicating in a host-to-host pattern and maintaining host-to-host links during the communication, consumers opportunistically send the Interest requests to the neighbor vehicles, which may have the desired Data packets that can satisfy the Interest packets. However, uncontrolled Interest packet transmissions for content search will result in a waste of resources and diminish the performance of applications in VANETs.
In the thesis, we focus on two daunting problems that have limited content distribution in Vehicular Information-Centric Networks when using Vehicle-to-Vehicle (V2V) communication: (i) unreliable content delivery and (ii) broadcast storm. We proposed a suite of protocols, OIFP, LISIC and LOCOS, destined to tackle these and other issues. In the proposed protocols, we have considered different metrics in VANETs that may influence the content distribution, such as distance, velocity, directions and the locations of the producers and consumers. By utilizing a small deferred timer, which is the time holden by the forwarding vehicles before sending the Interest packets out, priority is given to the selected vehicles to forward the Interest packets.
Extensive simulations show that all the proposed protocols outperform the vanilla VNDN protocol regarding transmission delay, content satisfaction rate and the average number of Interest transmissions. Besides, we have also implemented several related works and compared with our protocols. The overall performance of the proposed LOCOS protocol outperforms the related works. Moreover, our protocols do alleviate the broadcast storm problem and improve the content delivery rate.
| Identifer | oai:union.ndltd.org:uottawa.ca/oai:ruor.uottawa.ca:10393/38252 |
| Date | 10 October 2018 |
| Creators | Yu, Xiangshen |
| Contributors | Boukerche, Azzedine |
| Publisher | Université d'Ottawa / University of Ottawa |
| Source Sets | Université d’Ottawa |
| Language | English |
| Detected Language | English |
| Type | Thesis |
| Format | application/pdf |
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