Now showing 1 - 10 of 284
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Towards efficient methodologies for rapid-prototyping of communication technologies and cooperative ITS applications

2014 , Bittl, Sebastian , Roscher, Karsten

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Early energy estimation of heterogeneous embedded networks within adaptive systems

2015 , Heinrich, Patrick , Gossen, Dietrich , Oswald, Erik , Knorr, Rudi

This paper presents and evaluates a new approach of modeling energy consumption of communication within adaptive networked embedded systems. The objective is to enable energy estimation within early phases of system development, which allows system designers to compare different allocations of software components. As networked embedded systems consist of multiple specialized networks (with different protocols and topologies) and are characterized by a high degree of interaction, existing network-centric approaches have significant disadvantages describing entire systems. To overcome this problem a model was created which is based on individual communication connections between software components. This enables technology-transparent mapping to network topologies (across borders of networks) which significantly simplifies the evaluation of different software placements.

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Rapid Innovation Toolkit for the development of dependable cooperative applications

2018 , Seydel, Dominique , Weiß, Gereon

Cooperative applications have an enormous potential to improve future mobility systems. Though, special challenges regarding safety and security arise out of the connectivity and the distribution of the application among heterogeneous systems. These include expensive and time-consuming development and test phases. Especially, the debugging of an application, whose sub-functions are located on heterogeneous and partially mobile systems, requires a new kind of testing environment. The test and validation of the overall application is complex, as the wireless link implies varying timing behaviour and less data confidence. For this purpose, the proposed testbed integrates the DANA (""Description and Analysis of Networked Applications"") Framework to achieve a central overview of the overall application and the behaviour of all systems involved. This software tool kit is able to find deviations from the specified behaviour and also it can instantly locate and identify erroneous functions. In this paper, we present a solution for the complete development cycle of cooperative automotive systems together with an exemplary development flow for safety and security testing.

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Autonomous traffic warning system with Car-to-X communication

2013 , Jiru, Josef

Of the 2.36 million traffic accidents recorded in Germany in 2011, traffic congestion and tailgating caused the most injuries. Because they are usually positioned at one to two kilometer intervals, conventional traffic control systems do not adequately warn drivers of sudden danger situations. When positioned between the systems, drivers must rely solely on their own perception of the situation. To address this issue, Fraunhofer ESK is working with Ruetz Technologies and Transver to develop an autonomous traffic warning and information platform that can more quickly detect critical situations and provide precise local warnings through finer granularity.

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Safe adaptation for reliable and energy-efficient E/E architectures

2017 , Weiß, Gereon , Schleiß, Philipp , Drabek, Christian , Ruiz, Alejandra , Radermacher, Ansgar

The upcoming changing mobility paradigms request more and more services and features to be included in future cars. Electric mobility and highly automated driving lead to new requirements and demands on vehicle information and communication (ICT) architectures. For example, in the case of highly automated driving, future drivers no longer need to monitor and control the vehicle all the time. This calls for new fault-tolerant approaches of automotive E/E architectures. In addition, the electrification of vehicles requires a flexible underlying E/E architecture which facilitates enhanced energy management. Within the EU-funded SafeAdapt project, a new E/E architecture for future vehicles has been developed in which adaptive systems ensure safe, reliable, and cost-effective mobility. The holistic approach provides the necessary foundation for future invehicle systems and its evaluation shows the great potential of such reliable and energy-efficient E/E architectures.

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Preventing Failures of Cooperative Maneuvers Among Connected and Automated Vehicles

2021 , Häfner, Bernhard , Jiru, Josef , Schepker, Henning , Schmitt, Georg Albrecht , Ott, Jörg

Automated vehicles will be able to drive autonomously in various environments. An essential part of that is to predict other vehicles' intents and to coordinate maneuvers jointly. Such cooperative maneuvers have the ability to make driving safer and traffic more efficient. However, among the various communication protocols proposed for maneuver coordination, no single one satisfies all requirements.This paper assesses failure risks and mitigation strategies for cooperative maneuvers, including an analysis of popular protocols regarding this aspect. Next, we evaluate one particular cooperation protocol, the complex vehicular interactions protocol (CVIP), concerning performance of mitigation mechanisms and their influence on maneuver success rates or times to reach consensus among maneuver participants. Via simulation, we show that CVIP is suitable for cooperative maneuvers in realistic scenariosand investigate the trade-offs individual mitigation mechanisms face. These results are well-suited as guidelines and benchmark for other researchers developing cooperative maneuver protocols.

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Die Cloud unterstützt autonome Fahrzeuge beim Einparken

2020 , Drabek, Christian

Auch in Park & Ride-Anlagen müssen autonome Fahrzeuge sicher und zügig navigieren. Dafür sorgen nicht nur die Daten aus den eigenen Sensoren, sondern auch Informationen aus der Cloud. Was aber passiert, wenn die drahtlose Verbindung zur Datenwolke abbricht? Das Fraunhofer-Institut für Kognitive Systeme IKS hat eine Methode zum Entwurf sicherer und effizienter Cloud-basierter Systeme erarbeitet. Damit haben die Forscher(innen) ein automatisiertes Parksystem konzipiert, das einen vorübergehenden oder dauerhaften Ausfall der Verbindung zwischen Fahrzeugen und der Cloud kompensiert.

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Adaptive Software für sicherheitskritische Funktionen in Batterie-elektrischen Fahrzeugen

2016 , Rosenthal, Thorsten , Feismann, Timo , Schleiß, Philipp , Weiß, Gereon , Klein, Cornel

Der Einzug von immer mehr Assistenz- und (teil-) autonomen Systemen in heutige und insbesondere in zukünftige Fahrzeuge verlangt höhere Sicherheitsanforderungen bis hin zu fehlertoleranten Systemen. Eine adaptive Software-Architektur für sicherheitskritische Funktionen hilft diese Fehlertoleranz in einem Fahrzeug robust, kostengünstig und auch energieeffizient umzusetzen. Diese Software bedient sich dabei der ohnehin vorhandenen Steuergeräte im Fahrzeug und ermöglicht dadurch eine Redundanz ohne die Einbringung von zusätzlichen Steuergeräten. Durch die Konformität zu AUTOSAR ist das Konzept universell auf jeder automotive-tauglichen Hardware realisierbar.

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Effective certificate distribution in ETSI ITS VANETs using implicit and explicit requests

2015 , Bittl, Sebastian , Aydinli, Berke , Roscher, Karsten

Security and privacy of current Car-to-X systems heavily depends on the usage of pseudonym certificates. These carry the required information for authenticating messages received from other vehicles. However, only a limited amount of detailed studies about certificate distribution strategies in VANETs as well as attack surfaces of such systems has been proposed. Therefore, a general study about possible distribution mechanisms and their parametrization is provided in this work. Thereby, the management of entries in request lists is identified as a key issue for system performance. Additionally, a design flaw in the currently standardized ETSI ITS distribution scheme is outlined leading to the possibility of an attacker significantly increasing channel load on the safety critical control channel. A solution to this problem is suggested and an evaluation of its performance is provided. Furthermore, the evaluation shows the great influence of request list management on authentication delay and thus on security inducted packet loss.

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Warum Mobile Edge Computing am Feldrand? Eine Einführung in das Projekt INVIA

2019 , Stiller, Michael

Der Vortrag gibt eine Einführung in das Thema Edge Computing und einen Überblick über die Inhalte des Projekts INVIA. Fraunhofer ESK hat im Rahmen des Projekts eine Simulationsumgebung erstellt, um die Robustheit einer FOG, Edge und Cloud Anwendung analysieren zu können. Diese Umgebung besteht aus verschiedenen Softwarewerkzeugen, mit deren Hilfe Infrastrukturen und verteilte Anwendungsarchitekturen modelliert und bewertet werden können.