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International Conference on Distributed Computing systems Workshop

作者： Felix Büsching Sebastian Schildt Lars Wolf Institute of Operating Systems and Computer Networks (IBR) Technische Universität Braunschweig Braunschweig Germany

What is the processing-power of an omnibus? Can a train compute a climate model? Today's smart phones are becoming more and more powerful and have a performance similar to former high-end workstations. This power can also be used in a joint and cooperative way by building local and mobile ad-hoc clusters. In this paper we will show that setting up a smart phone cluster is not only possible, but it is also a reasonable thing to do, considering the sheer amount of mobile devices and the applications that could benefit from it.

关键词： Mobile communication Smart phones Mobile computing IEEE 802.11 Standards Cloud computing computer architecture

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DT-WBAN: Disruption tolerant wireless body area networks in healthcare applications

DT-WBAN: Disruption tolerant wireless body area networks in ...

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IEEE International Conference on Wireless and Mobile Computing, Networking And Communications (WiMob)

作者： Felix Büsching Maximiliano Bottazzi Wolf-Bastian Pöttner Lars Wolf Technische Universität Braunschweig Institute of Operating Systems and Computer Networks (IBR) Braunschweig Germany

Delay or disruption tolerant protocols can be used in several application areas. In the area of Ambient Assisted Living (AAL) or healthcare, these protocols are well-suited to provide a seamless handover between online and offline monitoring of vital parameters or activity data; this also implies a synchronization of offline gathered data. In this paper, we analyze the expected data rates for several medical sensors and applications and give an insight into how to dimension such disruption tolerant protocols and systems. We also developed a scenario for activity recognition in which we constantly monitor the acceleration data of a wearable sensor node. We implemented and evaluated this scenario with our disruption tolerant protocol for wireless sensor nodes and show its overall functionality, its utility, and its limits.

关键词： Sensors Protocols Synchronization Wireless sensor networks Wireless communication Monitoring Accelerometers

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BANDANA — Body area network device-to-device authentication using natural gAit

BANDANA — Body area network device-to-device authentication...

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IEEE International Conference on Pervasive Computing and Communications (PerCom)

作者： Dominik Schürmann Arne Brüsch Stephan Sigg Lars Wolf Institute of Operating Systems and Computer Networks TU Braunschweig Ambient Intelligence Comnet Aalto University

ISBN: (纸本)9781509043286

Secure spontaneous authentication between devices worn at arbitrary locations on the same body is a challenging, yet unsolved problem. We propose BANDANA, the first-ever implicit secure device-to-device authentication scheme for devices worn on the same body. Our approach leverages instantaneous variations in acceleration patterns from the user's gait to extract always-fresh secure secrets. It enables secure spontaneous pairing of devices worn on the same body or interacted with. The method is robust against noise in sensor readings and active attackers.

关键词： Acceleration Reliability Authentication Protocols Accelerometers Correlation Gravity

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CANDIS: Heterogenous Mobile Cloud Framework and Energy Cost-Aware Scheduling

CANDIS: Heterogenous Mobile Cloud Framework and Energy Cost-...

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IEEE/ACM Int'l Conference on & Int'l Conference on Cyber, Physical and Social Computing (CPSCom) Green Computing and Communications (GreenCom)

作者： Sebastian Schildt Felix Büsching Enrico Jörns Lars Wolf Technische Universität Braunschweig Institute of Operating Systems and Computer Networks (IBR) Braunschweig Germany

We present CANDIS, a framework that can distribute computing tasks to a computing cloud consisting of mobile devices running Android as well as computers. We argue how integrating mobile devices into an IT infrastructure makes ecologic sense while saving costs at the same time. We show how fluctuating energy spot market prices due to demand and varying supply could be fed into a Candis scheduler to further reduce costs of computation by shifting it to times of cheap energy prices. Thus, the presented approach can increase a business' sustainability, save money and - if applied on a larger scale - help to stabilize electricity grids when industrialized countries continue their move to renewables.

关键词： Servers Mobile handsets Electricity Performance evaluation Benchmark testing Processor scheduling Mobile communication

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Combining trust and ETX to provide robust wireless sensor networks 29th

Combining trust and ETX to provide robust wireless sensor ne...

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29th International Conference on Architecture of Computing systems, ARCS 2016

作者： Kantert, Jan Reinhard, Florian Von Zengen, Georg Tomforde, Sven Weber, Susanne Wolf, Lars Müller-Schloer, Christian Institute of Systems Engineering Leibniz University Hanover Appelstr. 4 Hanover30167 Germany Intelligent Embedded Systems Group University of Kassel Wilhelmshöher Allee 73 Kassel34121 Germany Institute of Operating Systems and Computer Networks TU Braunschweig Mühlenpfordtstraße 23 Braunschweig38106 Germany

ISBN: (纸本)9783800741571

Computational trust is a concept that imitates human trust relationships in technical systems. Typically, this is used to predict the estimated behaviour of interaction partners in heterogeneous and open systems. Wireless Sensor networks (WSNs) have some of these characteristics in common. In this paper, we extend our previous method to consider trust relationships in WSNs by combining Expected Transmission Count (ETX) and trust. The goal is to improve the robustness of WSNs against malicious or unreliable nodes. Therefore, we introduce a concept that resembles forgiveness and demonstrate the potential benefit of the approach in simulations. © VDE VERLAG GMBH.

关键词： Wireless sensor networks

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Best-effort low-delay service

Best-effort low-delay service

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Conference on Local computer networks (LCN)

作者： J. Diederich M. Doll M. Zitterbart Institute of Operating Systems and Computer Networks Technical University of Braunschweig Germany Institute of Telematics University of Karlsruhe Germany

The differentiated services (DiffServ) approach is intended to provide quality of service (QoS) in IP-based networks. This is a very important issue not only in wire-line fixed networks but also in IP-based wireless mobile networks. Currently, services within the DiffServ approach including premium service, assured service and best-effort service are intended for fixed networks. We have proposed the mobile differentiated services QoS model [J. Diederich, et al., 2003] to enhance the above services so they are better suited for wireless mobile networks. One part of this QoS model is the so-called best-effort low-delay (BELD) service, which has the same low-delay and low-jitter characteristic as premium service, but a certain probability for packet loss. This service is especially suited for delay-sensitive and loss-tolerant applications and can take favor of unused premium service resources to increase the network utilization. This paper presents details on the BELD service including initial simulation results showing the feasibility of BELD service.

关键词： Diffserv networks Quality of service computer networks 3G mobile communication Telephony Delay operating systems Telematics Circuit simulation Data communication

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Promote the use of explicit delay control

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Journal of Communications 2006年第3期1卷 41-52页

作者： Gu, Xiaoyuan Markwardt, Dirk Wolf, Lars Institute of Operating Systems and Computer Networks Technische Universität Braunschweig Mühlenpfordtstr. 23 Braunschweig 38106 Germany

The Internet is undergoing changes of its traffic mix, with the IP-based interactive multimedia applications gaining momentum. According to studies, UDP-based multimedia traffic has in recent years risen to above 25% of the overall Internet traffic volume, as compared to only 5% a decade ago. To these delay sensitive real-time interactive multimedia applications, out of delay boundary packets are usually obsolete. However the current Internet Protocol lacks a way to control the lifetime of the packets effectively. In this paper, we propose the Explicit Delay Control (EDC) as a viable packet lifetime control mechanism designed for such purpose. It uses an embedded Maximum Tolerable Delay (MTD) field in an IPv4 option. The value of MTD is determined by taking the application specific delay bound, measured round-trip-time, and the estimations of the path propagation delay and transmission delay into account. At each network node, the MTD is deducted by the singlehop delay. Packets that expire their lifetime are discarded and non-congestion related delay losses are signaled to the sender to reduce inaccuracy in delay estimations and to adapt to path changes. We implemented EDC in the Linux kernel. Our evaluation has shown that EDC can ensure the "legality" of the packets, reduce the waste of bandwidth and processing time in the networks, and help to alleviate congestions. © 2006 ACADEMY PUBLISHER.

关键词： Quality of service

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SATP-a transport protocol for ATM-intranets

SATP-a transport protocol for ATM-intranets

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IEEE Conference and Exhibition on Global Telecommunications (GLOBECOM)

作者： A. Boger M. Zitterbart J. Sokol Institute of Operating Systems and Computer Networks Technical University of Braunschweig Germany Siemens AG Munich Germany

This paper proposes a new transport protocol, namely SATP (simple ATM transport protocol), designed for ATM based intranets. It is adapted to the specific characteristics of ATM and can be used transparently from any application as an alternative to TCP which is known to be not very suitable for ATM. Transparent means that the use of SATP does not require any modification and recompilation of applications, which can benefit from the better performance of SATP in the case of ATM-based intranets. Beside the implementation and integration of the protocol, some performance results are presented.

关键词： Transport protocols Asynchronous transfer mode Throughput TCPIP Bandwidth High-speed networks Switches Telecommunication congestion control operating systems computer networks

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PulseHV: Opportunistic Data Transmissions over High Voltage Pulses for Smart Farming Applications

PulseHV: Opportunistic Data Transmissions over High Voltage ...

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International Conference on Distributed Computing in Sensor systems (DCOSS)

作者： Jana Huchtkoetter Andreas Reinhardt Ulf Kulau Department of Informatics TU Clausthal Germany TU Braunschweig Institute of Operating Systems and Computer Networks Germany

Wireless Sensor networks establish the foundation for a revolution in precision agriculture. As an integral part of smart farming systems, they can collect detailed information about crop health, air and soil conditions, and other relevant parameters to support agriculturists in their decision-making. Likewise, decentralized actuation (e.g., opening sprinkler valves) becomes possible when embedded sensor and actuator devices are deployed. From a technical point of view, smart farming systems strongly rely on embedded devices with wireless communication interfaces to cater for their convenient deployment. The operation of their wireless radio transceivers, however, often represents a significant energetic burden. This is particularly conspicuous when compared to the low-power microcontrollers that have become ubiquitous on current-generation sensing systems. We mitigate this issue by following an entirely different approach in this work, namely by exploiting the presence of electric fence energizers that are widely used in farming scenarios. Our solution called PULSEHV modulates data onto the highvoltage electric pulses emitted by fence energizers and thus enables broadcast communications at no extra overhead. As electrical fences commonly encircle entire patches of cropland, they act as large sending antennas; a proximity between deployed sensing devices and this antenna is implicitly ensured thereby. We practically demonstrate how PulseHV accomplishes an effective data rate of 2.7 bit/s through the application of pulse position modulation. This limited throughput is counterbalanced by the fact that receiving the broadcast transmissions incurs virtually no energy overhead.

关键词： Wireless sensor networks Electric fences Wireless communication Receivers Agriculture Antennas Data communication

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Securing CACC: Strategies for Mitigating Data Injection Attacks

Securing CACC: Strategies for Mitigating Data Injection Atta...

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IEEE Vehicular Networking Conference (VNC)

作者： Michael Wolf Alexander Willecke Johannes-Christian Müller Keno Garlichs Thomas Griebel Lars Wolf Michael Buchholz Klaus Dietmayer Rens W. van der Heijden Frank Kargl Ulm University Institute of Distributed Systems TU Braunschweig Institute-of Operating Systems and Computer Networks Ulm University Institute of Measurement Control and Microtechnology

ISBN: (数字)9781728192215

ISBN: (纸本)9781728192222

Cooperative Adaptive Cruise Control (CACC) is a typical example for cooperative maneuvers of connected, automated vehicles. Safe operation of any such vehicle highly depends on information emitted by the surrounding vehicles as it is processed by the vehicle's longitudinal controller. This opens an attack surface affecting vehicle safety. This paper studies how CACC controllers can be protected against such attacks to ensure the safety of the vehicle and its passengers. This raises the question of how to mitigate injection of false data into the controller by attacks and other forms of vehicle misbehavior. Based on a literature analysis, this paper defines a new categorization for mitigation strategies, discussing their individual strengths, weaknesses and their potential for attack mitigation. This categorization can be used to derive novel ideas for mitigations, for example, an approach with a parameter-dependent reaction of the controller based on a suspiciousness parameter signaled by the Misbehavior Detection System (MDS). Through a simulation study, we show that this approach improves safety and efficiency of the platoon under attack but also identify a fundamental trade-off between these two design goals.

关键词： Sensors Safety Stability analysis Data models Accidents Sensor fusion Actuators

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