Adaptive Solutions in Multihop Communication Protocols for Vehicular Ad Hoc Networks

Adaptive Solutions in Multihop Communication Protocols for Vehicular Ad Hoc Networks

Carlos Caloca (CICESE Research Center, Mexico and University Lille North of France, France) and J. Antonio Garcia Macias (CICESE Research Center, Mexico)
Copyright: © 2010 |Pages: 22
DOI: 10.4018/978-1-61520-913-2.ch015
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The potential for vehicular applications is rapidly increasing. However this variety also demands a flexible multihop communication protocol supporting different communications needs and adapting to the network environment and to context elements specified by the application itself. We think that adaptive solutions, recently starting to be applied to VANET routing and dissemination protocols, have a great potential for solving the problems stated above. The objective of this chapter is to introduce the reader to these kinds of solutions, show their benefits and also mention the challenges involved. Because one important aspect of adaptive solutions (in this case a common communication protocol for all applications), is having in-depth knowledge of the problem to solve, we first review these different vehicular applications and their classification, followed by their communication needs.
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Vehicular Networks Applications And Different Classifications

A major requirement in order to propose good adaptive solutions is first to know the environment in which the adaptation will occur. In the case of multihop communication protocols for VANETs, it is imperative to have a general view of all the applications that will use the protocol in the upper layer, know their characteristics and synthesize their communications needs. That is why as a first step, this section illustrates the vehicular applications envisioned by the research community.

The original motivation behind vehicular communications was to improve safety on the roads, as many lives have been lost and much more injuries have been incurred due to car crashes. A driver seeing the brake lights on the car in front of her has only a few seconds to react. Moreover, even if she responded in time, cars behind her could also crash since they were not warned of what was happening in front of them. This has motivated one of the first applications for vehicular communications, namely cooperative collision warning, which relies on vehicle-to-vehicle (V2V) communication1. From here on, other safety applications emerged more recently, such as applications that aim at providing drivers with real-time information about traffic conditions.

To better contrast the differences and similarities between the applications envisioned in this kind of networks, instead of listing all these applications specifically one by one, a better approach is to illustrate how they are classified in the literature and how this classification is evolving with the introduction of more potential applications.

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