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IEEE Conference on Network Softwarization (NetSoft)

作者： Radoslaw Cwalinski Hartmut Koenig Computer Networks and Communication Systems Group Brandenburg University of Technology Cottbus-Senftenberg Cottbus Germany

ISBN: (纸本)9781467394871

In this paper we propose a novel software-defined networking architecture for enterprise wireless local area networks (WLANs). The goal is to build a framework that exposes tools and methods for a centralized processing of IEEE 802.11 frames. In our architecture all management tasks, including beaconing, client authentication and association, are performed by the central controller instead of the distributed wireless access points as in traditional networks. The generated frames are tunneled to lightweight wireless access points (APs) or thin APs that perform the media access and radio frequency (RF) conversion. Agents executed on thin APs allow scheduling of simple tasks like traffic filtering for local execution. Additionally, the agents provide functions found in modern WLAN chipsets, such as precise frame transmit timings or RF spectrum analysis to the controller. Our architecture allows to delegate computationally intensive tasks to a central instance with enough processing power. Thus, it is best suited for devices with limited resources that we use as thin APs. We present applications that can be built using our framework, e.g., client geolocalization or energy consumption optimization. Finally we evaluate the performance of our architecture in a testbed using COTS devices with open-source software.

关键词： IEEE 802.11 Standard communication system security Wireless LAN Wireless networks Metadata Media Access Protocol

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Comparison of application and network layer name resolution in mobile Ad hoc networks 12

Comparison of application and network layer name resolution ...

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12th ACM Symposium on Performance Evaluation of Wireless Ad Hoc, Sensor, and Ubiquitous networks, PE-WASUN 2015

作者： Schellenberg, Sebastian Krug, Silvia Eckert, Juergen Seitz, Jochen Computer Networks and Communication Systems University of Erlangen Germany Communication Networks Group Technische Universität Ilmenau Germany

ISBN: (纸本)9781450337595

In disaster scenarios, communication systems usually consist of heterogeneous nodes and partially damaged infrastructure. communication is important for rescue teams and victims as well but a serious problem because normal network systems like wired or mobile radio Internet could be unreliable or simply not available. To deal with these problems, much effort has been spent on Mobile Ad hoc networks (MANETs) and their specialties. Those networks are usually unsteady and highly mobile. Therefore, classical network services like the resolution of names to their corresponding local IP addresses is a big challenge. In this paper, we will compare different MANET-adapted name resolution approaches located in the Application and Network Layer by simulations using the Network Simulator 3 (ns-3) and discuss their performance and fields of application. © 2015 ACM.

关键词： Mobile ad hoc networks

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Impact of traffic and mobility patterns on network performance in disaster scenarios 10

Impact of traffic and mobility patterns on network performan...

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10th ACM MobiCom Workshop on Challenged networks, CHANTS 2015

作者： Krug, Silvia Schellenberg, Sebastian Seitz, Jochen Communication Networks Group Technische Universität Ilmenau Germany Computer Networks and Communication Systems University of Erlangen Germany

ISBN: (纸本)9781450335430

First responders show specific movement and traffic patterns that are closely related to their current task during a disaster relief mission. In order to develop efficient communication systems both aspects should be considered. This is important especially if Delay Tolerant networks (DTN) are used, because they are exploiting the mobility of the nodes in order to deliver messages in scenarios with intermittent connectivity. In a disaster scenario, such a network is formed by the communication equipment of first responders. In this paper, we evaluate different mobility models and traffic generation options and show their impact on the performance of the epidemic routing protocol. Our results show that the correlation between traffic and mobility in disaster scenarios has a significant impact on the delivery ratio and experienced delay, respectively. © 2015 ACM.

关键词： Delay tolerant networks

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Continuous-variable QKD over 50km commercial fiber

arXiv

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arXiv 2017年

作者： Zhang, Yichen Li, Zhengyu Chen, Ziyang Weedbrook, Christian Zhao, Yijia Wang, Xiangyu Huang, Yundi Xu, Chunchao Zhang, Xiaoxiong Wang, Zhenya Li, Mei Zhang, Xueying Zheng, Ziyong Chu, Binjie Gao, Xinyu Meng, Nan Cai, Weiwen Wang, Zheng Wang, Gan Yu, Song Guo, Hong State Key Laboratory of Advanced Optical Communication Systems and Networks School of Electronics Engineering and Computer Science Center for Quantum Information Technology Center for Computational Science and Engineering Peking University Beijing100871 China State Key Laboratory of Information Photonics and Optical Communications Beijing University of Posts and Telecommunications Beijing100876 China Xanadu 372 Richmond St W TorontoM5V 2L7 Canada China Mobile Group Guangdong Co. Ltd. Guangzhou510623 China Xi’an Uotocom Network Technology Co. Ltd. Xi’an710075 China

The continuous-variable version of quantum key distribution (QKD) offers the advantages (over discrete-variable systems) of higher secret key rates in metropolitan areas, as well as the use of standard telecom components that can operate at room temperature. An important step in the real-world adoption of continuous-variable QKD is the deployment of field tests over commercial fibers. Here we report two different field tests of a continuous-variable QKD system through commercial fiber networks in Xi’an and Guangzhou over distances of 30.02 km (12.48 dB) and 49.85 km (11.62 dB), respectively. We achieve secure key rates two orders-of-magnitude higher than previous field test demonstrations by employing an efficient calibration model with one-time evaluation. This accomplishment is also realized by developing a fully automatic control system which stabilizes system noise, and by applying a rate-adaptive reconciliation method which maintains high reconciliation efficiency with high success probability in fluctuated environments. Our results pave the way to deploy continuous-variable QKD in metropolitan settings. Copyright © 2017, The Authors. All rights reserved.

关键词： Quantum cryptography

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state estimation for discrete-time memristive recurrent neural networks with stochastic time-delays

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International Journal of General systems 2016年第5期45卷 633页

作者： Liu, Hongjian Wang, Zidong Shen, Bo Alsaadi, Fuad E. [a] School of Information Science and Technology Donghua University Shanghai China.[b] Department of Computer Science Brunel University London Uxbridge United Kingdom.[c] Communication Systems and Networks (CSN) Research Group Faculty of Engineering King Abdulaziz University Jeddah Saudi Arabia.[d] School of Mathematics Anhui Polytechnic University Wuhu China.

This paper deals with the robust [Formula omitted.] state estimation problem for a class of memristive recurrent neural networks with stochastic time-delays. The stochastic time-delays under consideration are governed by a Bernoulli-distributed stochastic sequence. The purpose of the addressed problem is to design the robust state estimator such that the dynamics of the estimation error is exponentially stable in the mean square, and the prescribed [Formula omitted.] performance constraint is met. By utilizing the difference inclusion theory and choosing a proper Lyapunov-Krasovskii functional, the existence condition of the desired estimator is derived. Based on it, the explicit expression of the estimator gain is given in terms of the solution to a linear matrix inequality. Finally, a numerical example is employed to demonstrate the effectiveness and applicability of the proposed estimation approach.

关键词： Discrete time H∞ state estimation memristive neural networks stochastic time-delays

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Performance evaluation of network header compression schemes for UDP, RTP and TCP

Periodica polytechnica Electrical engineering and computer s...

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Periodica polytechnica Electrical engineering and computer science 2016年第3期60卷 151-162页

作者： Tömösközi, Máté Seeling, Patrick Ekler, Péter Fitzek, Frank H. P. Acticom GmbH Berlin Germany Department of Electronic Systems Aalborg University Denmark Communication Networks Group Technische Universität Dresden Germany Department of Computer Science Central Michigan University Mount PleasantMI48859 United States Department of Automation and Applied Informatics Faculty of Electrical Engineering and Informatics Budapest University of Technology and Economics Hungary

Modern cellular networks utilising the Long-Term Evolution (LTE) set of standards face an ever-increasing demand for mobile data from connected devices. Header compression is employed to minimise the overhead for IP-based cellular network traffic. In this paper, we evaluate the three header compression implementations used by such networks with respect to their potential throughput increase and complexity for different mobile service scenarios. We compare RTP, UDP and TCP profile compressions regarding their compression gain and complexity. Specifically, we consider header compression as defined by (i) IP Header Compression (RFC 2507), (ii) Robust Header Compression version 1 (RFC 3095), and (iii) the recently updated Robust Header Compression version 2 (RFC 5225) with TCP/IP profile (RFC 6846).This paper presents the performance evaluation of these header compression schemes for UDP, RTP and TCP, for both IPv4 and IPv6 streams in error-free and error-prone scenarios. A comparison between the Robust Header Compression methods and IP Header Compression is also provided. Our results show that all implementations have great potential for saving bandwidth in IP-based wireless networks, even under varying channel conditions. We also present for the first time an analysis of certain RTP header fields which, depending on the transmission characteristics, could have high impact on the overall compression gain. © 2016, Technical University of Budapest. All rights reserved.

关键词： Bandwidth

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Networked Devices Meeting Dependability while Supporting the Medical Supervision of Cardiac Patients under Rehabilitation

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IFAC-PapersOnLine 2015年第4期48卷 424-429页

作者： Malte Burkert Franz-Josef Stewing Heiko Krumm Christoph Fiehe Ingo Lück Computer Networks and Distributed Systems Group Technical University Dortmund Germany Materna Information and Communication Dortmund Germany

Networked customer devices provide a powerful, flexible and cost-efficient implementation environment for cyber-physical system applications but due to their inherent unreliability can directly support limited dependability only. Since in such an environment non-critical functions can collect, process and prepare comprising data which supports the adaptation and optimization so that new and significantly enriched medical functions can be realized, we envisage Big Dependable systems (BDS), a corresponding upcoming class of systems. Major steps towards their systematic development utilize approaches for communication and dynamic configuration in service-oriented systems, for automated monitoring and repair, and for in-built fault tolerance. We report on respective approaches examined and on a set of pilot applications before the vision of BDS is outlined before that background. The pilot applications employ cyber-physical systems in order to support rehabilitation training sessions which are remotely supervised and take place as well at home as in a virtual reality.

关键词： networked devices service oriented system medical application automated technical management cardiac rehabilitation ergometer training in-built fault-tolerance big dependable systems

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Robust reliability-aware buffer management for DTN multicast in disaster scenarios

Robust reliability-aware buffer management for DTN multicast...

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International Workshop on Reliable networks Design and Modeling (RNDM)

作者： Peggy Begerow Silvia Krug Sebastian Schellenberg Jochen Seitz Communication Networks Group Technische Universität Ilmenau Germany Computer Networks and Communication Systems University of Erlangen-Nuremberg Germany

When considering disaster scenarios, reliable communication can save hundreds of lives. Due to destroyed infrastructure, Mobile Ad hoc networks (MANETs) might be the only option for communication in such scenarios. However, such MANETs get partitioned frequently due to node movements resulting in intermittent connectivity. Delay Tolerant networks (DTNs) are suitable to handle this. With the help of DTNs, rescue teams can exchange information including multicast messages to all team members. The major challenge is to ensure that all team members or intended recipients receive a DTN multicast message. Several problems need to be solved for that, among which we consider the identification of the recipients and the limited resources of the nodes. In this paper, we present an extension of our protocol that enhances our existing buffer management approach and combines it with a configurable delivery ratio which should be reached. This configurable ratio is used to prioritize multicast messages and thus enhance their delivery probability. Besides that, we added a mechanism to selectively deliver the messages based on group membership intervals. Our simulation results show that this approach can ensure a higher delivery ratio for multicast messages in disaster scenarios.

关键词： Reliability Protocols Unicast Buffer storage Ad hoc networks Delays computer network reliability

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Utilizing reconfigurable hardware to optimizeworkflows in networked nodes: Deploying partial reconfiguration to optimize load and dependability in constrained networks

IFIP Advances in Information and Communication Technology

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IFIP Advances in Information and communication Technology 2015年 231卷 373-386页

作者： Murr, Dominik Mühlbauer, Felix Dressler, Falko Bobda, Christophe Self-Organizing Embedded Systems Group Department of Computer Science Kaiserslautern University of Technology Germany Computer Networks and Communication Systems Department of Computer Science Friedrich-Alexander University Erlangen-Nuremberg Germany

ISBN: (纸本)9780387722573

This work investigates the use of reconfigurable devices as computing platform for self-organizing embedded systems. Those usually consist of a set of distributed, autonomous nodes interacting with each other in order to solve a given problem. Several aspects of hardware-software co-design as well as partial reconfiguration are presented in order to enforce adaptivity of a node. One targeted application field for this kind of system are sensor networks in which reconfigurable devices, in this case FPGAs, can be used as computation nodes to provide services that require more computation power. To manage the available hardware resources as a whole we suggest a market-economy-like system of supply and demand. Requests, built up out of several tasks, can be po © Springer-Verlag Berlin Heidelberg 2015.

关键词： Field programmable gate arrays (FPGA)

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The Directional Hierarchical AODV (DH-AODV) routing protocol for wireless mesh networks

The Directional Hierarchical AODV (DH-AODV) routing protocol...

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International Conference on Computing, Control, Networking, Electronics and Embedded systems Engineering (ICCNEEE)

作者： Zainab Senan Mahmood Aisha-Hassan Abdalla Hashem Shehab Ahmed Hameed Farhat Anwar Wan Haslina Hasan Department of Computer and Information Engineering International Islamic University Malaysia Kuala Lumpur Malaysia Communication Systems & Networks Research Group Malaysia-Japan International Institute of Technology Kuala Lumpur Malaysia

Wireless mesh networks (WMNs) can be considered as a key technology for next-generation wireless networking. However, field trials and experiments prove that the performance of WMNs still below expectations. Therefore, several challenging research issues need to be determined. The routing protocol is one of the important factors to be improved to be robust, scalable, secured and efficient. This paper aims to design and implement a routing protocol that improves the scalability of the WMNs. The Directional Hierarchical AODV (DH-AODV) routing protocol is proposed taking advantage of the existing fields of the control packets in the AODV in order to reduce the load on the network's bandwidth and to quickly detect route breakage. The proposed protocol is designed, implemented and evaluated using Qualnet Simulator. The Ad-hoc on Demand Distance Vector (AODV) is selected as a benchmark. The simulation results indicate that this enhanced routing protocol can 47% reduce the end-to-end delay of data packets, improve the throughput by 11.2%, and decrease the packet loss rate 20% less than the standard AODV.

关键词： Logic gates Ad hoc networks Delays Throughput Routing protocols Routing

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