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IEEE International Conference on Communications (ICC)

作者： Michael Menth Ruediger Martin Ulrich Spoerlein Department of Distributed Systems Institute of Computer Science University of Würzburg Germany

The self-protecting multipath (SPM) is a simple protection switching mechanism that can be implemented, e.g., by MPLS. We present a linear program to optimize the SPM load balancing parameters for network dimensioning. Our study shows that the SPM is a very efficient mechanism in the sense that it requires only little backup capacity since it outperforms the p-cycle approach and the shortest path rerouting by far. The investigation of the computation time and the memory consumption recommends the Simplex method as an LP solver rather than an interior point method (IPM). The computation time of the program depends mainly on the number of links in the network and it is well feasible for small and and medium size networks. For large networks, however, fast heuristics are required.

关键词： Scanning probe microscopy Protection switching Telecommunication traffic Load management Multiprotocol label switching Resilience Routing Availability Quality of service computer science

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Adaptive bandwidth allocation: impact of routing and load balancing on tunnel capacity requirements

Adaptive bandwidth allocation: impact of routing and load ba...

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Conference on Next Generation Internet Networks, NGI

作者： J. Milbrandt K. Humm M. Menth Department of Distributed Systems Institute of Computer Science University of Würzburg Wurzburg Germany

In this paper, we consider adaptive bandwidth allocation (ABA) for capacity tunnels as an effective means for multi-hour network design. Traffic engineering (TE) tunnels established in a network from border-to-border (b2b) can be used not only for route pinning between ingress/egress node pairs but also for efficient implementation of resilient network admission control. If static bandwidth allocation (SBA) based on peak-rate traffic assumptions is used to dimension the b2b tunnels, fluctuations of the network traffic can lead to under- or overprovisioning of network capacity in the tunnels. If ABA is used instead, the tunnel sizes are dynamically adapted to current traffic conditions. The efficient use of network capacity assigned to TE tunnels strongly depends on the structure of these tunnels. The contribution of this paper is an assessment of the bandwidth savings that are achievable with ABA in comparison to SBA for various tunnel structures with different path layouts and load balancing strategies. Our results show that the capacity savings due to ABA depend on the routing and load balancing schemes provisioned in the network and that these savings may be increased by appropriately chosen tunnel implementations

关键词： Channel allocation Routing Load management Communication system traffic control Tellurium Telecommunication traffic Admission control Fluctuations Bandwidth Quality of service

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Adapting distributed hash tables for mobile ad hoc networks

Adapting distributed hash tables for mobile ad hoc networks

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IEEE Annual Conference on Pervasive Computing and Communications Workshops (PerCom)

作者： T. Heer S. Gotz S. Rieche K. Wehrle Protocol Engineering and Distributed Systems Group Wilhelm-Schickard-Institute for Computer Science University of Tübingen

While unstructured P2P systems have been embraced widely in mobile ad-hoc networks (MANETs), the applicability of structured approaches like distributed hash tables (DHTs) to such settings remains controversial. Existing research delivers promising empirical results addressing the concerns about performance, complexity, and reliability, but does not analyze the principles of combining DHTs and MANETs. This paper identifies and discusses the fundamental implications of non-infrastructural networks for DHTs and analyzes solutions to these challenges

关键词： Mobile ad hoc networks Protocols Peer to peer computing Routing Broadcasting systems engineering and theory computer science Mobile computing Ad hoc networks computer network reliability

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Using Kademlia for the configuration of B3G radio access nodes

Using Kademlia for the configuration of B3G radio access nod...

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IEEE Annual Conference on Pervasive Computing and Communications Workshops (PerCom)

作者： S. Oechsner T. Hossfeld K. Tutschku F.-U. Andersen L. Caviglione Department of Distributed Systems Institute of Computer Science University of Würzburg Germany Siemens AG Berlin Germany Department of Communications Computer and Systems Science University of Genova Italy

Configuration and management of radio access nodes in beyond 3G (B3G) networks such as nodeBs, wireless LAN or WIMAX access points is a complex task that consumes a high amount of resources. Most configuration changes have to be done by an operator, especially when it comes to the adaption of a node to its environment, i.e., the cells surrounding its own. This is an expensive and inflexible method. Moreover, the required manual interference hampers the adaptivity of B3G networks towards topology changes. In this work, we present an architecture that allows for the detection of neighboring cells, thereby enabling an easy or even autonomic configuration of the access nodes. In addition to this, the presented Kademlia-based overlay network enables the storage of information needed for network management, such as configuration data or performance measures

关键词： computer network management Radio spectrum management Wireless LAN WiMAX Network topology computer science computer networks distributed computing Resource management Interference

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Web Services for the Integration of XML-Based Content into Learning Platforms: A Three-level Model

Web Services for the Integration of XML-Based Content into L...

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International Symposium on Leveraging Applications of Formal Methods, Verification and Validation ( ISoLA)

作者： Reinhold Kröger Ulrike Lucke Markus Schmid Djamshid Tavangarian Distributed Systems Laboratory University of Applied Sciences of Wiesbaden Germany Institute of Computer Science University of Rostock Germany

Along with the increasing diversity of educational markup languages there is a strong need for flexible integration of such content into learning platforms. Therefore, we have identified four basic mechanisms: plain linking from the platform to external content, conversion of content into the platforms native format, and service-based invocation of external content as well as specific functionality related to it. Architectural principles, benefits, and drawbacks of these concepts are compared, and exemplary realizations are described.

关键词： Web services Markup languages Multidimensional systems Packaging Runtime Joining processes XML Application software computer science computer architecture

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distributed wisdom: Designing a replication service for large peer-to-peer data grids

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IEEE distributed systems Online 2006年第3期7卷 25-30页

作者： Srinivas, A. Vijay Reddy, M. Venkateswara Janakiram, D. Indian Institute of Technology Madras India Distributed and Object Systems Lab. Department of Computer Science and Engineering Indian Institute of Technology Madras India Department of Computer Science and Engineering Indian Institute of Technology Madras India

Some of the key issues in building services for large scale distributed systems, realizing Vishwa, a peer-to-peer (P2P) middleware architecture for developing grid applications are discussed. Researchers are producing large amounts of scientific data and believe that distributed computations on the data must be scheduled and available to a large number of scientists. It is suggested that the platform must scale up to a large number of nodes and data units in the system and must also be scalable geographically. A scalable, reconfigurable shared-object space over the two-layer architecture can be developed that incorporates mechanisms to maintain replicated data and must also provide a shared-object abstraction over a wide-area distributed system.

关键词： distributed computer systems

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Throughput Performance of Java Messaging Services Using FioranoMQ

Throughput Performance of Java Messaging Services Using Fior...

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13th GI/ITG Conference - Measuring, Modelling and Evaluation of computer and Communication systems

作者： Robert Henjes Michael Menth Sebastian Gehrsitz Department of Distributed Systems Institute of Computer Science University of Würzburg Am Hubland D-97074 Würzburg Germany

The Java messaging service (JMS) is a means to organize communication among distributed applications according to the publish/subscribe principle. If the subscribers install filter rules on the JMS server, JMS can be used as a message routing platform, but it is not clear whether its message throughput is sufficiently high to support large-scale systems. In this paper, we investigate the capacity of the high performance JMS server implementation by Fiorano. In contrast to other studies, we focus on the message throughput in the presence of filters and show that filtering reduces the performance significantly. We also present a model that describes the service time for a single message depending on the number of installed filters and validate it by measurements. This model helps to forecast the system throughput for specific application scenarios.

关键词： Random access memory Throughput

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Backup Capacity Requirements for MPLS Fast Reroute

Backup Capacity Requirements for MPLS Fast Reroute

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2006 ITG Symposium on Photonic Networks

作者： Ruediger Martin Michael Menth Department of Distributed Systems Institute of Computer Science University of Würzburg Am Hubland D-97074 Würzburg Germany

ISBN: (纸本)9783800729593;3800729598

MPLS fast reroute (MPLS-FRR) mechanisms deviate the traffic in case of network failures at the router closest to the outage location to achieve an extremely fast reaction time. We review and compare the one-to-one backup and the facility backup concept that are options for MPLS-FRR to deviate the traffic via a detour or a bypass, respectively. Basically, the backup paths can take the shortest path that avoids the outage location from the point of local repair to the tail-end router or to the merge point. We then evaluate the backup capacity requirements and the configuration overhead in terms of the number of backup paths per primary path in a parametric study depending on the network characteristics. While the facility backup concept imposes clearly less configuration overhead than the one-to-one backup, its standard path layout requires more capacity. This can be reduced by a simple modification.

关键词： Legged locomotion

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Cerco: Supporting Range Queries with a Hierarchically Structured Peer-to-Peer System

Cerco: Supporting Range Queries with a Hierarchically Struct...

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Conference on Local computer Networks (LCN)

作者： Simon Rieche Klaus Wehrle Leo Petrak Clemens Wrzodek Distributed Systems Group RWTH Aachen University Germany Germany Wilhelm-Schickard-Institute for Computer Science University of Tubingen Germany

Structured peer-to-peer systems are designed for a highly scalable, self organizing, and efficient lookup for data. The key space of the so-called distributed hash tables (DHTs) is partitioned and each partition with its keys and values is assigned to a node in the DHT. For data retrieval however, the very nature of hash tables allows only exact pattern matches. We propose Cerco, a simple solution for the problem of range queries by employing a hierarchically structured P2P approach based on the principles of distributed hash tables. We show that a dynamic hierarchy of DHTs with on-demand classification of items can positively influence the response time of queries while maintaining lookup correctness

关键词： Peer to peer computing Load management Information retrieval Pattern matching Delay computer science Organizing Tree data structures Scalability Linux

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Simplification and analysis of transitive trust networks

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Web Intelligence and Agent systems 2006年第2期4卷 139-161页

作者： Jøsang, Audun Gray, Elizabeth Kinateder, Michael School of Software Engineering and Data Communications Queensland University of Technology Australia Computer Science Department Trinity College Dublin Ireland Institute of Parallel and Distributed Systems Faculty of Computer Science University of Stuttgart Germany

When transacting and interacting through open computer networks, traditional methods used in the physical world for establishing trust can no longer be used. Creating virtual network substitutes with which people, organisations and software agents can derive trust in other parties requires computerised analysis of the underlying trust networks. This article describes an approach to trust network analysis using subjective logic (TNA-SL), that consists of the three following elements. Firstly it uses a concise notation with which trust transitivity and parallel combination of trust paths can be expressed. Secondly it defines a method for simplifying complex trust networks so that they can be expressed in this concise form. Finally it allows trust measures to be expressed as beliefs, so that derived trust can be automatically and securely computed with subjective logic. We compare our approach with trust derivation algorithms that are based on normalisation such as PageRank and EigenTrust. We also provide a numerical example to illustrates how TNA-SL can be applied. © 2006 - IOS Press and the authors. All rights reserved.

关键词： computer networks

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