Many investments are being made in vehicular networking due to social and technological benefits that comes with the development of services and applications for the community, including safety issues. Vehicular Delay-Tolerant Networks (VDTNs) appear as innovative network architecture, able to outline communication challenges caused by issues like variable delays, disruption and intermittent connectivity. In this paper, a real-world VDTN testbed is introduced and it demonstrates and validates the technical concepts of the architecture in a real environment. VDTNs characteristics like IP over VDTN and out-of-band signaling concepts will be demonstrated in a safety service where warning messages are exchanged to notify emergency situations and distress signals. The main goals are to prove the applicability of VDTNs over different environments and evaluate the impacts of a real scenario on protocols stacks and services. The testbed considers three cars equipped with a Bluetooth and Wi-Fi devices, exchanging messages in a pre-defined route.Index Terms-Vehicular delay-tolerant networks; VDTN; Real testbed; Warning message service.
properly cited.Vehicular Delay-Tolerant Networks (VDTNs) are a breakthrough based DTN solution used to provide vehicular communications under challenging scenarios, characterized by long delays and sporadic connections. Using the store-carry-and-forward paradigm, this technology allows in-transit bundles to asynchronously reach the destination hop by hop over traveling vehicles equipped with short-range wireless devices. The VDTN architecture assumes out-of-band signaling with control and data planes separation and follows an IP over VDTN approach. This paper presents a real-world VDTN prototype evaluated through a safety application and a Traffic Jam Information Service. It also demonstrates the real deployment of this new vehicular communication approach. The real testbed is an important contribution since some complex issues presented in vehicular communication systems can be studied more accurately in real-world environments than in a laboratory approach. The results confirm that real deployment of VDTNs is doable and can be seen as a very promising technology for vehicular communications, although it requires appropriated technologies for outline interferences and quality of service support.
Vehicular communications emerged as a modern alternative to increase road traffic safety and also promote, through technologies, the development of applications and services to the travelers. In this context, Vehicular Delay Tolerant Networks (VDTNs) arise as innovative solution since it presents an appropriate network architecture, supporting communication in intermittent situations. This work presents an embedded VDTN testbed created to evaluate safety systems in a real-world scenario. A traffic jam information service will be executed to demonstrate basics characteristics of VDTN, like out-of-band signaling and IP over VDTN. The main contributions of this paper consider the presentation of an appropriate hardware and software to embedded application for VDTNs, network performance evaluation over different environments, and corresponding results analysis using diverse metrics.Index Terms-Vehicular delay-tolerant networks; Embedded VDTN; Real testbed; Wi-Fi; Traffic jam information service.
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