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Delay-tolerant networking in restricted networks

Delay-tolerant networking in restricted networks

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17th Annual International Conference on Mobile Computing and Networking, MobiCom'11 and Co-Located Workshops - 6th ACM Workshop on Challenged networks, CHANTS'11

作者： Morgenroth, Johannes Pögel, Tobias Heitz, Robert Wolf, Lars Institute of Operating Systems and Computer Networks Technische Universität Braunschweig Braunschweig Germany

ISBN: (纸本)9781450308700

For security reasons, many companies usually allow only strictly regulated communication, specific system configurations and predetermined software components. Therefore, often only communication over the HTTP protocol is possible, which operates by using a request-response approach. In this paper we present the design and evaluation of a convergence layer for our DTN implementation IBR-DTN using HTTP as underlying protocol. On the remote side we use a web server and a database for the connection management. Through the usage of long-polling we realize a bidirectional communication. In the evaluation, we show the results of bandwidth and latency measurements. © 2011 ACM.

关键词： HTTP

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Design and implementation of a low-power energy management module with emergency reserve for solar powered DTN-nodes 11

Design and implementation of a low-power energy management m...

引用

3rd Extreme Conference on Communication: The Amazon Expedition, ExtremeCom 2011

作者： Doering, Michael Rottmann, Stephan Wolf, Lars Institute of Operating Systems and Computer Networks Technische Universität Braunschweig Braunschweig Germany

ISBN: (纸本)9781450310796

DTN nodes often idly wait for contacts and unnecessarily consume energy during these periods. For solar-powered nodes this means that solar panels and batteries could be much smaller with an efficient energy management, reducing the physical size of these nodes. We present our design of a solar-powered DTN node including a module that handles solar charge management, energy management and a discovery mechanism to wake sleeping nodes. Moreover, the system senses the remaining battery capacity, and keeps a reserve for emergency communications. Our evaluation shows that the power management module's design is energy-efficient and performs as intended. Furthermore, we evaluate the discovery mechanism. The results show that the capabilities of the module offer a promising new approach to the implementation of energy efficient routing in DTNs. Copyright 2011 ACM.

关键词： Energy harvesting

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Live-streaming in delay tolerant networks

Live-streaming in delay tolerant networks

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17th Annual International Conference on Mobile Computing and Networking, MobiCom'11 and Co-Located Workshops - 6th ACM Workshop on Challenged networks, CHANTS'11

作者： Morgenroth, Johannes Pögel, Tobias Wolf, Lars Institute of Operating Systems and Computer Networks Technische Universität Braunschweig Braunschweig Germany

ISBN: (纸本)9781450308700

Streaming of audiovisual media contents such as video or music using mobile devices and wireless networks leads to new challenges because these network connections are typically not very reliable. In this demo, we show streaming of live video using a Delay Tolerant Network (DTN) approach. This allows the integration of multiple connections which leads to a higher availability and enables a video transmission without loss in the data stream.

关键词： Delay tolerant networks

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Impact of radio range on contact characteristics in bus-based delay tolerant networks

Impact of radio range on contact characteristics in bus-base...

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2011 8th International Conference on Wireless On-Demand Network systems and Services, WONS 2011

作者： Doering, Michael Pöttner, Wolf-Bastian Pögel, Tobias Wolf, Lars Institute of Operating Systems and Computer Networks Technische Universität Braunschweig Braunschweig Germany

ISBN: (纸本)9781612841885

In bus-based delay tolerant networks the duration of a contact between two nodes limits the amount of data that can be transferred. For the implementation of such networks it is important to determine which contact durations can be expected. Moreover, this information can be used by scheduling and routing algorithms to increase efficiency. In this paper we structure and characterize the different types of contacts and examine the effects of radio range on contact duration. For realistic results we experimentally investigate the typical range of IEEE 802.11a/b and use a real mobility trace of a large-scale public transport network. We report the simulation results for different types of contacts and the probability distribution of contact durations for various realistic ranges. Furthermore we show that the angle of contacts is an appropriate criterion for the classification of contacts, and propose to use it as input for routing and scheduling decisions. © 2010 IEEE.

关键词： Delay tolerant networks

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Demonstration of a low-power energy management module with emergency reserve for solar-powered DTN-nodes 11

Demonstration of a low-power energy management module with e...

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3rd Extreme Conference on Communication: The Amazon Expedition, ExtremeCom 2011

作者： Doering, Michael Rottmann, Stephan Wolf, Lars Institute of Operating Systems and Computer Networks Technische Universität Braunschweig Braunschweig Germany

ISBN: (纸本)9781450310796

We propose a field experiment and a demonstration of a solar powered DTN node with a power management module. This module reduces the power consumption of the node by turning it off when the node is idle. It also handles solar charge management, energy management and a discovery mechanism to wakeup sleeping nodes. Copyright 2011 ACM.

关键词： Solar energy

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Piggy-backing link quality measurements to IEEE 802.15.4 acknowledgements

Piggy-backing link quality measurements to IEEE 802.15.4 ack...

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8th IEEE International Conference on Mobile Ad-hoc and Sensor systems, MASS 2011

作者： Pottner, Wolf-Bastian Schildt, Sebastian Meyer, Daniel Wolf, Lars Institute of Operating Systems and Computer Networks Technische Universität Braunschweig Braunschweig Germany

ISBN: (纸本)9780769544694

In this paper we present an approach to piggyback link quality measurements to IEEE 802.15.4 acknowledgement frames by generating acknowledgements in software instead of relying on hardware support. We show that the software-generated ACKs can be sent meeting the timing constraints of IEEE 802.15.4. This allows for a standard conforming, energy neutral dissemination of link quality related information in IEEE 802.15.4 networks. This information is available at no cost when transmitting data and can be used as input for various schemes for adaptive transmission power control and to assess the current channel quality. © 2011 IEEE.

关键词： IEEE Standards

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Nearest-neighbor queries with well-spaced points

Nearest-neighbor queries with well-spaced points

引用

7th International Symposium on Voronoi Diagrams in Science and Engineering, ISVD 2010

作者： Gray, Chris TU Braunschweig Institute of Operating Systems and Computer Networks Braunschweig Germany

ISBN: (纸本)9780769541129

We assume we are given a set of points that have the property that their Voronoi diagram - restricted to some suitable bounding box - consists of only fat cells. We call such points well-spaced points. We give a linear-sized data structure for finding the nearest neighbor to a query point among well-spaced points in O(log n) time. We further show how to extend the results to higher dimensions. Finally, we show how to find the Voronoi diagram of these points in O(nlogn) time in 3 dimensions. © 2010 IEEE.

关键词： Nearest neighbor search

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QoS-AODV6E: An energy-balancing QoS routing scheme for WSNs

QoS-AODV6E: An energy-balancing QoS routing scheme for WSNs

引用

International Conference on Networked Sensing systems

作者： Pöttner, Wolf-Bastian Wellnitz, Oliver Wolf, Lars Institute of Operating Systems and Computer Networks Technische Universität Braunschweig Germany

ISBN: (纸本)9781424479108

Wireless Sensor networks (WSN) now advance into areas where new scenarios and applications require WSNs to meet certain Quality of Service (QoS) requirements. To tackle these challenges, a routing approach has to consider limited energy supply of sensor nodes, dynamic network conditions as well as node mobility. This paper presents QoS-AODV6E, a routing scheme based on the Ad-hoc On-Demand Distance Vector (AODV) routing protocol, which encompasses QoS and Energy-Awareness for mobile WSNs. Based on the reactive AODV routing protocol, QoS-AODV6E allows applications to specify QoS parameters and finds suitable routes that support their requirements. In order to prolong the lifetime of the network, QoS-AODV6E balances the energy consumption between different paths through the network based on the weakest node. We evaluate our implementation of QoS-AODV6E in Contiki using simulation and measurements. © 2010 IEEE.

关键词： Quality of service

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Efficient network selection in heterogeneous communication scenarios using arbitration

Efficient network selection in heterogeneous communication s...

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2010 IEEE International Symposium on "A World of Wireless, Mobile and Multimedia networks", WoWMoM 2010

作者： Lahde, Sven Wegner, Martin Wolf, Lars Technische Universität Braunschweig Institute of Operating Systems and Computer Networks Braunschweig Germany

ISBN: (纸本)9781424472659

Mobile internet has rapidly evolved in the past years with an ever increasing number of novel technologies and services. Today's mobile devices often support multiple communication technologies for accessing Internet services. However, they all do not tap the full potential of these capabilities as users often have to manually select networks and only one network is used at a time. Different approaches in the area of Always Best Connected propose strategies for user-centric network selection, but most of them focus either on application-oriented or device-centric approaches. The muXer project aims at combining both aspects and increasing the efficiency of network usage. In this paper, we introduce the muXer Global Arbitration Process (GAP) that balances application-oriented ratings of networks while optimizing the usage of communications resources and simultaneously meeting the application and user requirements. Besides deciding which single network an application should use, GAP considers network bundles as well as a proactive delaying of data transfers as additional options to reach a global optimum for all applications running on the device. We compare GAP with other network selection strategies and present benchmarks showing that these aspects bring a clear efficiency gain. ©2010 IEEE.

关键词： Data transfer

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The GAL middleware platform for AAL: A Case Study

The GAL middleware platform for AAL: A Case Study

引用

12th IEEE International Conference on e-Health Networking, Application and Services, Healthcom 2010

作者： Eichelberg, Marco Rein, Andreas Blisching, Felix Wolf, Lars R and D Division Health OFFIS -Institute for Information Technology Oldenburg Germany Institute of Operating Systems and Computer Networks Technische Universität Braunschweig Braunschweig Germany

ISBN: (纸本)9781424463749

GAL, the Lower Saxony Research Network Design of Environments for Ageing, investigates how information and communication technology can provide for better environments for ageing. This paper describes a service oriented middleware platform for Ambient Assisted Living and its use in a number of different assistive systems developed in the GAL project: personal activity and household assistant, monitoring of preventive and rehabilitation sports, sensor-based activity determination, and sensor-based fall prevention and recognition. Besides a detailed description of the middleware platform and its elements and interfaces, central infrastructure services and their particularly applications in the different use cases are presented. © 2010 IEEE.

关键词： Middleware

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