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Efficient network selection in heterogeneous communication scenarios using arbitration

Efficient network selection in heterogeneous communication s...

引用

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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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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Paint it black - Increase WSN energy efficiency with the right housing 6

Paint it black - Increase WSN energy efficiency with the rig...

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6th ACM Workshop on Real World Wireless Sensor networks, RealWSN 2015

作者： Kulau, Ulf Schildt, Sebastian Rottmann, Stephan Wolf, Lars Institute for Operating Systems and Computer Networks Technische Universität Braunschweig Braunschweig Germany

ISBN: (纸本)9781450338400

It is a well-known fact that Wireless Sensor networks (WSNs) that are exposed to real environmental conditions suffer from harsh temperatures. Yet, the temperature does not only have negative impact as the energy efficiency of processing units benefits from higher temperatures. The minimal voltage for correct operation of CMOS circuits is bounded by the temperature. Thus, temperature-dependent undervolting schemes for WSN nodes have been proposed in the past to extend the network lifetime. However, not much thought has been given into directly inuencing the most relevant factor: Temperature. In this work we look at the inuence of various WSN housings onto the temperature profile of WSN nodes and quantify the energy saving potential of choosing the right housing.

关键词： Housing

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Bundle protocol header compression 9

Bundle protocol header compression

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9th ACM MobiCom Workshop on Challenged networks, CHANTS 2014

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

ISBN: (纸本)9781450330718

Delay Tolerant networks (DTNs), especially the Bundle Protocol (BP), transmit data in self-contained bundles each of which carrying all necessary information to process it and route it to its destination. While this allows for long delays, link disruptions and higher loss rates and makes the BP well-suited for networks such as Wireless Sensor networks (WSNs), it imposes a significant overhead in terms of the header sizes, as e.g. node addresses are denoted as full URIs, called Endpoint Identifiers (EIDs). While the Compressed Bundle Header Encoding introduces a special naming scheme to eradicate these URIs which reduces the header size to some extent, in this paper we present a novel, full-fledged header compression for the BP that can be applied stateless or stateful, i. e. without or with storing part of the bundle headers on forwarding nodes. The gains achievable with this approach are extensively evaluated with the simulation of bundles carefully generated from real-world network traffic on the one hand, and of realistically moving public transport vehicles with a traffic pattern often found in such Delay Tolerant Wireless Sensor networks (DTWSNs) on the other hand. © Copyright 2014 ACM.

关键词： Delay tolerant networks

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Investigation of Angle Dependent Errors in Phase-based Ranging with Different Antennas

Investigation of Angle Dependent Errors in Phase-based Rangi...

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2020 International Conference on Embedded Wireless systems and networks, EWSN 2020

作者： Schröder, Yannic Koke, Til Thomas, Christoph Wolf, Lars Institute of Operating Systems and Computer Networks Technische Universität Braunschweig Braunschweig Germany

ISBN: (纸本)9780994988645

Antenna orientation is an often overlooked factor in radiobased localization. Our experience with phase-based ranging suggests that antenna orientation has an impact on measured distances. Therefore, we investigate the impact of antenna orientation on phase-based ranging in the 2.4 GHz ISM band. Four different antenna types are tested in an anechoic chamber. Our evaluation is conducted end-to-end;we do not compare antenna properties by measuring parameters via a vector network analyzer but compare the measured distance between two wireless sensor nodes. Our evaluation shows that some antenna types report varying distance results at different rotation angles while other types are hardly influenced at all. Copyright © 2020 held by the authors.

关键词： Sensor nodes

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IBR-DTN: An efficient implementation for embedded systems

IBR-DTN: An efficient implementation for embedded systems

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2008 International Conference on Mobile Computing and Networking, MobiCom'08 - 3rd ACM Workshop on Challenged networks, CHANTS'08

作者： Doering, Michael Lahde, Sven Morgenroth, Johannes Wolf, Lars Institute of Operating Systems and Computer Networks Technische Universitat Braunschweig Braunschweig Niedersachsen Germany

ISBN: (纸本)9781605581866

In our demonstration we present an implementation of DTN for embedded systems and demonstrate how a WLAN access point can be turned into a stand-alone DTN-node for mobile applications. The modular software design of "IBRDTN" is centered on the efficient use of resources and interoperability with the DTN2 reference implementation. Our modules comprise a DTN Core, Bundle Router, Persistent Storage and a Convergence Layer Manager. IBR-DTN is work in progress, but the comparison of the features and performance to DTN2 is already very promising. Finally, we present a practical evaluation in a mobile scenario in which a vehicle mounted node passes a stationary node.

关键词： Delay tolerant networks

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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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Efficient charging station scheduling for an autonomous parking and charging system

Efficient charging station scheduling for an autonomous park...

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9th ACM International Workshop on VehiculAr Inter-NETworking, systems, and Applications, VANET'12

作者： Timpner, Julian Wolf, Lars Institute of Operating Systems and Computer Networks Technische Universität Braunschweig Braunschweig Germany

ISBN: (纸本)9781450313179

With the proliferation of electric vehicles, charging stations are a scarce resource that needs to be managed efficiently. In this paper, we therefore examine requirements for efficient charging station scheduling and propose several algorithms that we have implemented for the V-Charge system, which introduces new concepts for combining public and individual transportation, as well as coordinated recharging strategies for electric vehicles. We evaluate these strategies in different usage scenarios using real-world parking statistics. © 2012 Authors.

关键词： Scheduling

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Bundle protocol mail convergence layer: Leveraging legacy internet infrastructure for DTNs

Bundle protocol mail convergence layer: Leveraging legacy in...

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8th ACM MobiCom Workshop on Challenged networks, CHANTS 2013

作者： Schildt, Sebastian Gernert, Björn Wolf, Lars Institute for Operating Systems and Computer Networks Technische Universität Braunschweig Braunschweig Germany

ISBN: (纸本)9781450323635

In the past many research prototypes employed a DTN to provide mail services to remote areas. This work proposes the opposite: Using SMTP and IMAP to transport the Bundle Protocol (BP). Despite the obvious feasibility of such a scheme, we will show that the Mail Convergence Layer (MCL) provides advantages over other Convergence Layers and can qualitatively enhance the capabilities of a DTN. Each DTN node has an associated mailbox that can be used to deposit bundles, if the node is absent. In this case a mail server e• ectively acts as an intermediate always-on DTN node without the need to deploy a BP router. We will present the motivation and the concept of the MCL as well as an open-source implementation.

关键词： Internet protocols

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Flow control mechanisms for the bundle protocol in IEEE 802.15.4 low-power networks

Flow control mechanisms for the bundle protocol in IEEE 802....

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7th ACM International Workshop on Challenged networks, CHANTS 2012

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

ISBN: (纸本)9781450312844

Wireless Sensor networks (WSN) are networks formed by wireless sensor nodes that generally feature a low-power microcontroller and an IEEE 802.15.4 radio. Most Delay Tolerant Wireless Sensor networks (DTWSN) in literature use proprietary protocols that are specifically designed for a single purpose. In this paper we explore, how the Bundle Protocol (BP) can be used on top of the IEEE 802.15.4 PHY and MAC layers, while avoiding overhead for additional layers in between. To pursue this, a Convergence Layer (CL) has to realize certain tasks that usually are dealt with in layers 3 and 4 of the OSI 7-layer protocol stack. We argue that ow control has to be an integral ingredient of the CL and compare the performance of four difierent mechanisms using our BP implementation for Contiki. Copyright © 2012 ACM.

关键词： Flow control

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