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Multipath Video Streaming Based on Hierarchical Routing Management

Multipath Video Streaming Based on Hierarchical Routing Mana...

引用

International Conference on Advanced Information networking and Applications Workshops (AINAW)

作者： Thomas Volkert Manuel Osdoba Andreas Mitschele-Thiel Martin Becke Integrated Communication Systems Group Ilmenau University of Technology Ilmenau Germany Computer Networking Technology Group University of Duisburg-Essen Essen Germany

ISBN: (纸本)9781467362399

In this paper, we propose a new approach to enhance today's hop-by-hop routing. The main goal of our work is to improve the efficiency of network usage and to support transmission requirements (TR) provided by applications. In the paper, we focus on non-functional requirements such as a desired upper bound for the end-to-end delay and a required data rate. Both are encoded as meta data in each data packet. Furthermore, we describe how these embedded (in-band) TRs can be used for QoS-oriented routing, implemented on each intermediate router. This directs packets along routes, providing only the network resources actually needed. In order to support these routing decisions based on TRs, we utilize data from an additional control plane, which provides QoS-related topology data from the network. For this purpose, we apply our idea of "Hierarchical Routing Management" (HRM). It implements a signaling of QoS-related route capabilities. In order to provide a scalable system, we apply hierarchical addressing and topology aggregation, resulting in fewer details in higher hierarchy levels. In detail, we describe how SCTP can be used to encode and transport the TRs for a multipath video-streaming scenario. Moreover, we explain the HRM internal signaling processes, which are required to create and use the HRM system. Compared to current IP routing, this allows for a better network efficiency and QoE at receiver side. Nevertheless, the HRM approach remains backward compatible to current application and router implementations. The paper shows that these benefits can be achieved at an acceptable overhead for packet processing.

关键词： Routing Quality of service Topology Delays Network topology Streaming media IP networks

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Analysis of SIP-based threats using a VoIP Honeynet System

Analysis of SIP-based threats using a VoIP Honeynet System

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11th IEEE International Conference on Trust, Security and Privacy in Computing and Communications, TrustCom-2012

作者： Hoffstadt, Dirk Marold, Alexander Rathgeb, Erwin P. Computer Networking Technology Group University of Duisburg-Essen Essen Germany

ISBN: (纸本)9780769547459

Current security issues like service misuse and fraud are well-known problems of SIP-based networks. To design and evolve effective countermeasures, it is important to know how these attacks are launched in reality. For gathering the required data, a specialized SIP Honeynet System has been implemented and operated since December 2009 which has recorded over 47.5 million SIP messages in total. Over time, based on our Honeypot experiences, we developed essential improvements such as global monitoring of whole subnets, clustering of SIP messages or bidirectional SIP message correlation. In this paper, we first describe these system extensions and demonstrate their benefits. Then we provide an analysis of gathered data which goes beyond pure statistical packet analysis. We identify, analyze and correlate the distinct phases of typical multistage attacks and also provide an example of a full attack sequence resulting in attempts to make Toll Fraud calls via a hijacked SIP account. © 2012 IEEE.

关键词： Voice/data communication systems

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Analysis and optimization of routing trust values in a Kademlia-based distributed hash table in a malicious environment

Analysis and optimization of routing trust values in a Kadem...

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2012 2nd Baltic Congress on Future Internet Communications, BCFIC 2012

作者： Kohnen, Michael University of Duisburg-Essen Institute for Experimental Mathematics Computer Networking Technology Group Essen Germany

ISBN: (纸本)9781467316712

Trust management in peer-to-peer (P2P) networks is a current topic. Most of the current work focuses on a "clean routing table", aiming to keep it free from malicious nodes. We follow a different approach which can be characterized as "clean routing process": All kinds of nodes may be contained in a node's routing table. During the routing process, only trustworthy nodes shall be used for determining the next hop and finally for storing or retrieving content items. The trust values are stored in a distributed way and the ratings must be given and stored verifiably. In this paper, we present the results of implementing our trust concept into a Kademliabased Distributed Hash Table (DHT). We analyze the distribution of the routing trust values and introduce malicious nodes into the network. The results show that our concept is able to identify them precisely. © 2012 IEEE.

关键词： Peer to peer networks

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The TREND experimental activities on "green" communication networks

The TREND experimental activities on "green" communication n...

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2013 24th Tyrrhenian International Workshop on Digital Communications - Green Information and Communications technology, TIWDC 2013

作者： Meo, Michela Zhang, Yi Hu, Yige Idzikowski, Filip Budzisz, Lukasz Ganji, Fatemeh Haratcherev, Ivaylo Conte, Alberto Cianfrani, Antonio Chiaraviglio, Luca Coiro, Angelo Bolla, Raffaele Jaramillo Ortiz, Olga Bruschi, Roberto Gonzalez, Roberto Guerrero, Carmen Tego, Edion Matera, Francesco Keranidis, Stratos Kazdaridis, Giannis Korakis, Thanasis Dipartimento di Elettronica e Telecomunicazioni Politecnico di Torino Italy Telecommunication Networks Group Technische Universität Berlin Germany Networking Technology Domain Alcatel-Lucent Bell Labs. Nozay France DIET Department University of Rome Sapienza Italy Telecommunication Networks and Telematics Lab. RU of CNIT c/o University of Genoa Italy Departamento de Ingeniería Telemática Universidad Carlos III de Madrid Spain Fondazione Ugo Bordoni Rome Italy Department of Computer and Communication Engineering University of Thessaly Greece

ISBN: (纸本)9781479907564

Aimed at answering important questions about the energy demand of current telecom infrastructure and the design of sustainable and energy-efficient future networks, the research of a number of European partners is brought together in the TREND project. In this paper we present the achievements of the Work Package coordinating the experimental activities of the project - WP4. Although not presenting a completely finished portrait yet, the results shown help building a better global view on the "big picture" in the field of energy-efficient networking. © 2013 IEEE.

关键词： Energy efficiency

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SIP Trace Recorder: Monitor and Analysis Tool for threats in SIP-based networks

SIP Trace Recorder: Monitor and Analysis Tool for threats in...

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International Wireless Communications and Mobile Computing Conference

作者： Dirk Hoffstadt Stefan Monhof Erwin Rathgeb Computer Networking Technology Group University of Duisburg-Essen Essen Germany

ISBN: (纸本)9781457713781;9781457713798

Security issues like service misuse and fraud are well-known problems of SIP-based networks. To develop effective countermeasures, it is important to know how these attacks are launched in reality. For gathering the required data, we have developed a monitoring and analyzing system which we call "SIP Trace Recorder (STR)". It can be used in different scenarios and parses and stores relevant SIP information in a database. Based on the collected SIP data, the STR analysis plug-ins provide different, automatic threat analyses. It also offers a Privacy Option which can be activated in sensitive environments (e.g., productive telephone systems) to protect private data, but preserve all of its analysis functions. In this paper, we present the architecture, features and usage scenarios of the STR and demonstrate its automatic threat analysis capabilities.

关键词： SIP monitoring analysis STR misuse fraud attacks VoIP security

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Analysis of SIP-Based Threats Using a VoIP Honeynet System

Analysis of SIP-Based Threats Using a VoIP Honeynet System

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IEEE International Conference on Trust, Security and Privacy in Computing and Communications (TrustCom)

作者： Dirk Hoffstadt Alexander Marold Erwin P. Rathgeb Computer Networking Technology Group University of Duisburg-Essen Essen Germany

关键词： IP networks Registers Monitoring Servers Standards Correlation Security

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Analysis and optimization of routing trust values in a Kademlia-based Distributed Hash Table in a malicious environment

Analysis and optimization of routing trust values in a Kadem...

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Baltic Congress on Future Internet Communications (BCFIC Riga)

作者： Michael Kohnen Computer Networking Technology Group Institute for Computer Science and Business Information Systems Essen Germany

Trust management in peer-to-peer (P2P) networks is a current topic. Most of the current work focuses on a “clean routing table”, aiming to keep it free from malicious nodes. We follow a different approach which can be characterized as “clean routing process”: All kinds of nodes may be contained in a node's routing table. During the routing process, only trustworthy nodes shall be used for determining the next hop and finally for storing or retrieving content items. The trust values are stored in a distributed way and the ratings must be given and stored verifiably. In this paper, we present the results of implementing our trust concept into a Kademliabased Distributed Hash Table (DHT). We analyze the distribution of the routing trust values and introduce malicious nodes into the network. The results show that our concept is able to identify them precisely.

关键词： Peer to peer computing Routing IP networks Public key Optimization Distribution functions

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The TREND experimental activities on “green” communication networks

The TREND experimental activities on “green” communication...

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Tyrrhenian International Workshop on Digital Communications - Enhanced Surveillance of Aircraft and Vehicles, TIWDC/ESAV

作者： Michela Meo Yi Zhang Yige Hu Filip Idzikowski Łukasz Budzisz Fatemeh Ganji Ivaylo Haratcherev Alberto Conte Antonio Cianfrani Luca Chiaraviglio Angelo Coiro Raffaele Bolla Olga Jaramillo Ortiz Roberto Bruschi Roberto Gonzalez Carmen Guerrero Edion Tego Francesco Matera Stratos Keranidis Giannis Kazdaridis Thanasis Korakis Dipartimento di Elettronica e Telecomunicazioni Politecnico di Torino Italy Networking Technology Domain Alcatel-Lucent Bell Labs Nozay France DIET Department University of Rome “Sapienza” Italy Fondazione Ugo Bordoni Rome Italy Telecommunication Networks Group Technische Universität Berlin Germany Telecommunication Networks and Telematics Lab RU of CNIT c/o University of Genoa Italy Departamento de Ingeniería Telemática Universidad Carlos III de Madrid Spain Department of Computer and Communication Engineering University of Thessaly Greece

Aimed at answering important questions about the energy demand of current telecom infrastructure and the design of sustainable and energy-efficient future networks, the research of a number of European partners is brought together in the TREND project. In this paper we present the achievements of the Work Package coordinating the experimental activities of the project - WP4. Although not presenting a completely finished portrait yet, the results shown help building a better global view on the “big picture” in the field of energy-efficient networking.

关键词： Power demand Monitoring Switches Energy consumption Power measurement Voltage measurement DVD

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The application of decay rate analysis for WSN buffer dimensioning

The application of decay rate analysis for WSN buffer dimens...

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Wireless Telecommunications Symposium, WTS

作者： Jacqueline Stewart Robert Stewart MN Hassan Department of Electronics Computer and Software Engineering The Wireless Networking Group Athlone Institute of Technology Athlone Company Westmeath Ireland

The provisioning of a Quality of Service (QoS) for applications requiring real-time service demands low latency, low Bit Error Rate (BER) and bounded end to end delay guarantees. Facilitating this within a Wireless Sensor Network (WSN) is Guaranteed Time slots (GTS's) activated using a beacon enabled mode and under the governance of the accepted protocol of the IEEE 802.15.4 standard. However the limitation in design of only seven GTS per superframe duration pre-determines a problem of allocation when requirements by applications in need of good QoS exceed the supply of GTS's. This results in the QoS aware traffic requiring differentiation of service in the buffer of the Personal Area Network Coordinator (PANC). A question arises as to the true ability of service dimensioning of networks without the prior knowledge of buffer allocation. In some WSN the buffer shares memory with the application and radio stack. This memory requirement will vary depending on the application. This research complements a previous paper in which the application of Decay Rate Analysis in relation to the dimensioning of buffer allocation of the various nodes was analysed using simulation and analytical methodology. The results illustrated the probability of queue occupancy for a specific application namely VoIP. This paper proposes that by employing the decay rate analysis a better understanding of buffer requirements at the PANC can be determined for different sensor applications. This analysis will further enhance the pre-deployment dimensioning of a network for greater operational efficiency and overall cost effectiveness.

关键词： Wireless sensor networks Resource management Random access memory Quality of service Payloads Peer to peer computing Topology

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Characterization of graphene-based nano-antennas in the terahertz band

Characterization of graphene-based nano-antennas in the tera...

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6th European Conference on Antennas and Propagation, EuCAP 2012

作者： Llatser, Ignacio Kremers, Christian Chigrin, Dmitry N. Jornet, Josep Miquel Lemme, Max C. Cabellos-Aparicio, Albert Alarcón, Eduard Universitat Politcnica de Catalunya Barcelona Spain Broadband Wireless Networking Laboratory School of Electrical and Computer Engineering Georgia Institute of Technology Atlanta GA 30332 United States Theoretical Nano-Photonics Group Institute of High-Frequency and Communication Technology University of Wuppertal D-42119 Wuppertal Germany School of Information and Communication Technology KTH Royal Institute of Technology 16640 Kista Sweden

ISBN: (纸本)9781457709180

Graphene-enabled wireless communications constitute a novel paradigm which has been proposed to implement wireless communications at the nanoscale. Indeed, graphene-based nano-antennas just a few micrometers in size have been predicted to radiate electromagnetic waves at the terahertz band. In this work, the performance of a graphene-based nano-patch antenna in transmission and reception is numerically analyzed. The resonance frequency of the nano-antenna is calculated as a function of its length and width, both analytically and by simulation. The influence of a dielectric substrate with a variable size, and the position of the patch with respect to the substrate is also evaluated. Finally, the radiation pattern of a graphene-based nano-patch antenna is compared to that of an equivalent metallic antenna. These results will prove useful for designers of future graphene-based nano-antennas, which will enable wireless communications at the nanoscale. © 2012 IEEE.

关键词： Graphene

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