Skip to content. | Skip to navigation

Personal tools

This is SunRain Plone Theme


You are here: Home / papers


Papers published by the INET group.
Osman Ugus: Secure and Reliable Remote Programming in Wireless Sensor Networks
PhD Thesis, Fernuniversität Hagen
Simulative Assessments of IEEE 802.1 Ethernet AVB and Time-Triggered Ethernet for Advanced Driver Assistance Systems and In-Car Infotainment
Investigations into the usage of Ethernet in automo- biles is in progress in academia, the car industry and companies producing automotive electronic devices. The interest in Ethernet is motivated by the high bandwidth and scalability provided. It is a well experienced technology with support for the Internet Protocol (IP) suite. Ethernet as in-car network is expected to breakthrough in Advanced Driver Assistance Systems (ADAS) involving cameras and in the multimedia domain. Both the IEEE Audio Video Bridging (AVB) standard and Time-Triggered Ethernet (TTE) are promising candidates. This paper presents a simulation study aimed to investigate the behavior of these technologies when supporting ADAS and multimedia traffic on star-based networks under varying workload. The performance under different operating conditions is presented and discussed.
Beware of the Hidden! How Cross-traffic Affects Quality Assurances of Competing Real-time Ethernet Standards for In-Car Communication
Real-time Ethernet is expected to become the core technology of future in-car communication networks. Following its current adoption in subsystems for info- and entertainment, broadband Ethernet promises new features in the core of up- coming car series. Its full potential will enfold when deploying Ethernet-based backbones that consolidate all automotive domains on a single physical layer at increased bandwidth but reduced complexity and cost. In such a backbone, traffic with a variety of real-time requirements and best-effort characteristics will share the same physical infrastructure. However, certain applications like online diagnosis, data- or firmware updates, and access to off-board backends will introduce bursty high traffic loads to the sensitive core of the cars communication network. In this work, we analyze the robustness against cross-traffic of real-time Ethernet protocols. Based on a realistic in-car scenario, we demonstrate that background cross-traffic can have significant impact on in-car backbone networks—even for real-time protocols with strict prioritization. By comparing the real-time approaches Ethernet AVBs asynchronous credit based shaping with the time-triggered and rate-constrained traffic classes of Time-triggered Ethernet (AS6802) we quantify how different media access policies suffer from low priority bursts of applications such as diagnosis, online updates or backend-based services. Our simulation study of a realistic in-car backbone design and traffic model reveals that in a realistic in-car network design, cross-traffic may increase end-to-end latency by more than 500% while the jitter can become 14 times higher than for a network without background tasks. We discuss ways to mitigate these degrading effects.
RIOT: an Open Source Operating System for Low-end Embedded Devices in the IoT
RIOT OS: Towards an OS for the Internet of Things
ICN + IoT 14
Untersuchungen zur Komplexität komponierter Netzwerkarchitekturen im Future Internet
Are Circles Communities?
Group Formation in eLearning-enabled Online Social Networks
A Middleware for Transparent Group Communication of Globally Distributed Actors
Native Actors - A Scalable Software Platform for Distributed, Heterogeneous Environments
Multicast Mobility in MIPv6: Problem Statement and Brief Survey (I-D 09)
A Common API for Transparent Hybrid Multicast
A Common API for Transparent Hybrid Multicast
A Hardware/Software Co-Design Approach for Ethernet Controllers to Support Time-triggered Traffic in the Upcoming IEEE TSN Standards
Due to the increasing bandwidth and timing requirements, next generation communication backbones in cars will most likely base on real-time Ethernet variants that satisfy the demands of the new automotive applications. The upcoming IEEE 802.1Qbv standard shows communication approaches based on coordinated time devision multiple access (TDMA) to be good candidates for providing communication with determinism and highly precise timing. Implementing time-triggered architectures in software requires significant development effort and computational power. This paper shows a scalable HW/SW co-design approach for new real-time Ethernet controllers based on the partitioning into communication and application components. The tasks required for communication are divided: Time-critical and computationally intensive parts are realised in dedicated hardware modules allowing the attached CPU to fulfil the timing requirements of the automotive application without interference. The evaluation using a Field Programmable Gate Array (FPGA) based prototype implementation shows that the precision for the time-triggered transmission and the performance of the proposed implementation of the required synchronisation protocols satisfies the requirements of applications in the automotive domain.
A Configurable Transport Layer for CAF
Manyfold Actors: Extending the C++ Actor Framework to Heterogeneous Many-Core Machines using OpenCL
Reconsidering Reliability in Distributed Actor Systems
How Dia-Shows Turn Into Video Flows: Adapting Scalable Video Communication to Heterogeneous Network Conditions in Real-Time
Predictive Video Scaling - Adapting Source Coding to Early Network Congestion Indicators
A P2P Virtualization for Distributed Adaptive Conference Management
A Virtual and Distributed Control Layer with Proximity Awareness for Group Conferencing in P2PSIP
Design of TDMA-based In-Car Networks: Applying Multiprocessor Scheduling Strategies on Time-triggered Switched Ethernet Communication
Real-time Ethernet variants gain importance for communication infrastructure of various time-critical domains, such as in-car networks. Synchronous time- triggered traffic guarantees strict timing but requires a detailed schedule for all participants. Designing these schedules by hand is extensive work and with increasing network size almost impossible. In this paper, we contribute a mapping of the time-triggered network scheduling problem into the domain of multiprocessor scheduling. This set of transforma- tion rules allows us to apply established scheduling algo- rithms as well as new strategies to organise time-triggered switched networks. Experimental results from a prototype implementation of a scheduling framework based on this mapping show the feasibility of our concept. The framework demonstrates a multiple solver approach that uses algorithms with different optimality criteria in parallel.
Topology Authentication in RPL
HAMcast Demo EuroView12
HAMcast: A Showcase on Universal Group Communication in the Future Internet
HAMcast - Evaluierung einer systemzentrierten Middleware-Komponente für einen universellen Multicast-Dienst im Future Internet
Extending IEEE 802.1 AVB with Time-triggered Scheduling: A Simulation Study of the Coexistence of Synchronous and Asynchronous Traffic
In-car networks based on Ethernet are expected to be the first choice for future applications in the domain of info- and entertainment. However, the full benefit of a technologically integrated in-car network will only become rewarding with an Ethernet-based backbone, unifying several automotive domains in a single infrastructure. Today, there is remarkable interest in the IEEE 802.1 Audio/Video Bridging (AVB) protocol suite, that provides end-to-end performance guarantees in Ethernet networks. But for the strict timing requirements of automotive control-traffic, these guarantees are too weak. An extension of Ethernet AVB with synchronous time-triggered traffic can overcome these limitations. In this paper, we investigate the coexistence of synchronous and asynchronous traffic by experimentally adding time-triggered messages to the credit-based shaper of AVB in a straightforward way. Based on simulations and analytical evaluations, we quantify the impact of such integration concepts for a reasonable design range. Our results demonstrate the feasibility of a shaping strategy with concurrent AVB and time-triggered message, but show a significant impact of the schedule design on the asynchronous AVB streams. Based on our findings, we provide recommendations for configurations that can improve end-to-end network performance for in-car applications by over 100%.
A Scalable Communication Infrastructure for Demand Side Management using Multicast
Federated End-to-End Authentication for the Constrained Internet of Things using IBC and ECC
TRAIL: Topology Authentication in RPL
Mobiles Lernen im Zeitalter sozialer Medien
Socialize Online Learning: Why we should Integrate Learning Content Management with Online Social Networks
Software Stacks for Mixed-critical Applications: Consolidating IEEE 802.1 AVB and Time-triggered Ethernet in Next-generation Automotive Electronics
Real-time Ethernet variants are expected to build the future communication infrastructure in cars. First camera based driver assistance functions will communicate using IEEE 802.1 AVBs credit-based shaping. But for the strict timing requirements of automotive control-traffic, AVBs current timing guarantees are insufficient. The upcoming IEEE 802.1Qbv standard proposes synchronous time-triggered traffic to overcome these limitations. This paper presents a low footprint microcontroller based communication architecture, that supports both traffic classes in parallel while using standard hardware components. It allows first realistic performance analyses of coexistent traffic shaping strategies in a software based implementation.
RPKI MIRO: Monitoring and Inspection of RPKI Objects
An Extension of the OMNeT++ INET Framework for Simulating Real-time Ethernet with High Accuracy
Distributed SIP Conference Management with Autonomously Authenticated Sources and its Application to an H.264 Videoconferencing Software for Mobiles
Distributed SIP conference management with autonomously authenticated sources and its application to an H.264 videoconferencing software for mobiles
Comparing Time-Triggered Ethernet with FlexRay: An Evaluation of Competing Approaches to Real-time for In-Vehicle Networks
Simulation und Evaluation von Echtzeit-Ethernet in Fahrzeugnetzen

Document Actions

« April 2019 »
Upcoming Events
VTC Spring 2019 Apr 28, 2019 - May 01, 2019 — Kuala Lumpur
RIOT Hack'n'ACK (2019/04) Apr 30, 2019 05:00 PM - 11:00 PM — HAW Hamburg, BT7, R4.60
IoThon Hackathon May 03, 2019 - May 05, 2019 — Aalto University, Finland
Upcoming events…