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An advance dynamic resource reservation algorithm for OBS networks: Design and performance

An advance dynamic resource reservation algorithm for OBS Ne...

引用

12th IEEE International Conference on Electronics, Circuits and systems, ICECS 2005

作者： Boudriga, N. Obaidat, M.S. Cherif, M. Guemara-ElFatmi, S. Communication Networks and Security Research Lab. SUPCOM University of the 7th of November Carthage Tunisia Department of Computer Science Monmouth University W. Long Branch NJ 07764 United States

ISBN: (纸本)9789972611001

This paper aims at studying the impact of the parameters subject to variability in the transmission of traffic in an OBS network. It provides techniques allowing better resources' use based on user satisfaction and profile. It describes an advance reservation scheme for OBS networks that copes with the uncertainty of the QoS requirements specified at connection establishment. Our method attempts to increase the utilization of resources such as bandwidth and wavelengths.

关键词： Quality of service

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A New Family of 2-D Optical Orthogonal Codes for Optical CDMA Access networks

A New Family of 2-D Optical Orthogonal Codes for Optical CDM...

引用

Asia-Pacific Conference on communications

作者： Sun Shurong Yin Hongxi Xu Anshi National Laboratory on Local Fiber-Optic Communication Networks & Advanced Optical Communication Systems School of Electronics Engineering and Computer Science Peking University Beijing China

ISBN: (纸本)0780391322

A new family of 2-D OOC, PC/OOC, for use in optical CDMA access networks is proposed in this paper. Analysis of its auto-and-cross correlation property is given and proof of that its cardinality achieves the upper bound in theory is presented. In contrary to previously constructed codes, PC/OOC exhibits the characteristics that the construction algorithm is simple and the number of wavelengths is optional which makes PC/OOC truly applicable to OCDMA networks as multi-access codes and greatly facilitates the operation of OCDMA

关键词： Optical fiber networks Multiaccess communication High speed optical techniques Upper bound Optical fiber communication Bandwidth Bit rate Telecommunication traffic Access protocols Design methodology

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Symbol-Timing Recovery with Modified Gardner Detectors

Symbol-Timing Recovery with Modified Gardner Detectors

引用

International Symposium on Wireless communication systems (ISWCS)

作者： W. Gappmair S. Cioni G.E. Corazza O. Koudelka Institute of Communication Networks and Satellite Communications Graz University of Technology Graz Austria Department of Electronics Computer Science and Systems University of Bologna Bologna Italy

For symbol timing recovery in digital receivers, a modified form of the Gardner detector is introduced. If applied a tracking loops for M-PSK modulated signals shaped as raised cosines, it is shown that the suggested synchronizer achieves a definitely better jitter performance (Gaussian and self-noise domain) than the original proposed by Gardner. In particular, this turns out to be true for baseband shapes with small roll-off factors as it is required for bandwidth-efficient systems

关键词： Detectors Baseband Jitter Matched filters Electronic mail Tracking loops Time division multiple access Gaussian noise Signal to noise ratio communication networks

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Analyzing and modifying Chord's stabilization algorithm to handle high churn rates

Analyzing and modifying Chord's stabilization algorithm to h...

引用

IEEE International Conference on networks

作者： G. Kunzmann A. Binzenhofer R. Henjes Institute of Communication Networks Munich University of Technology Munich Germany Department of Distributed Systems Institute of Computer Science University of Würzburg Wurzburg Germany

Peer-to-peer (P2P) networks offer reliable and efficient services in different application scenarios. In particular, structured P2P protocols (like Chord (L. Stoica et al., 2001)) have to handle changes in the overlay topology fast and with as little signaling overhead as possible. This paper analyzes the ability of the Chord protocol to keep the network structure up to date, even in environments with high churn rates, i.e. nodes joining and leaving the network frequently. High churn rates occur, e.g., in mobile environments, where participants have to deal with the limited resources of their mobile devices, such as short battery lifetimes or high communication costs. In this paper, we analyze different design parameters and their influence on the stability of Chord-based network structures. We also present several modifications to the basic Chord stabilization scheme, resulting in a much more stable overlay topology.

关键词： Algorithm design and analysis Fingers Protocols Intrusion detection Network topology Routing Counting circuits Electronic mail Batteries Costs

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An advance dynamic resource reservation algorithm for OBS networks: Design and performance

An advance dynamic resource reservation algorithm for OBS ne...

引用

IEEE International Conference on Electronics, Circuits and systems (ICECS)

作者： N. Boudriga M.S. Obaidat M. Cherif S. Guemara-ElFatmi Communication Networks and Security Research Laboratory SUPCOM University of 7th of November Tunisia Communication Networks and Security Research Lab. SUPCOM University of the 7 th of November at Carthage Tunisia Department of Computer Science Monmouth University NJ USA

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When is wavelength conversion contributing to reducing the blocking rate

When is wavelength conversion contributing to reducing the b...

引用

GLOBECOM'05: IEEE Global Telecommunications Conference, 2005

作者： Jaumard, Brigitte Meyer, Christophe Xiao, Yu Department of Computer Science and Operations Research Université de Montréal suce. centre-ville Montréal Que. H3C 3J7 Canada Canada Research Department of Optimization of Communication Networks Department of Electrical Engineering École Polytechnique de Montréal

ISBN: (纸本)0780394143

Although many studies have now appeared on solving the Routing and Wavelength Assignment (RWA) problem with full or partial wavelength conversion, it is still unclear to which extend the addition of wavelength converters has a significant or even measurable impact on network bandwidth efficiency or on the blocking rate. Indeed, several authors have observed that the blocking rate is often unchanged even with the addition of converters depending on the traffic instances and the network topology. For this reason, some authors, e.g., Ramaswami and Sasaki (1998) or Erlebach and Stefanakos (2003) have investigated further the usefulness or the impact of adding converters. In this study, we pursue in this direction and investigate two issues: performing some preprocessing tests when solving the RWA problem with/without conversion by identifying, at the outset, some lightpaths that will be present in the optimal solution, and some of the patterns that the traffic instances must contain in order to observe an advantage of adding converters. Conclusions are that quite particular traffic patterns must be present in order for wavelength conversion to be useful, and in that case, it is sufficient to have conversion features at a very limited number of nodes. © 2005 IEEE.

关键词： Routers

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Traffic modelling and cost optimization for transmitting traffic messages over a hybrid broadcast and cellular network

Traffic modelling and cost optimization for transmitting tra...

引用

International Conference on Intelligent Transportation

作者： Jing Hu R. German A. Heindl R. Kates M. Unbehaun Department of Science and Traffic Policy University Erlangen-Nuremberg Munich Germany Department of Computer Networks and Communication Systems University Erlangen-Nuremberg Erlangen Germany Department of Science and Traffic Policy Traffic Technology BMW Group Germany Department of Science and Traffic Policy Traffic Technology Munich Germany

Broadcast networks are typically used for distributing common information (music, data) to many users within a given service area, while cellular networks provide point-to-point voice or data delivery to individual users. The fundamental difference from an economic point of view is that cellular networks follow a 'pay-per-use' paradigm with 'per minute' or 'per kbyte' charges, whereas commercial broadcast services (e.g. pay-TV) are charged for by long-term (months or years) subscriptions. In this paper, we investigate a hybrid system for carrying traffic information services. It comprises a data broadcast network for providing the base capacity and a cellular network for carrying the peak traffic exceeding this base capacity. Cellular capacity for the excess data traffic can be purchased whenever needed. However, capacity in broadcast networks is typically leased for long periods of time (potentially several years) at a fixed price. The key problem is how to choose depending on the statistic properties of the input data traffic - the fixed broadcast capacity such that the overall operation cost for the hybrid network is minimized. Results for a telematics service delivering traffic information show that indeed considerable cost savings can be achieved by carefully balancing the capacity allocated in the broadcast network against the peak traffic redirected through the cellular network. The simple analytical model proposed to aid in this tradeoff is validated by simulations.

关键词： Telecommunication traffic Traffic control Cost function Land mobile radio cellular systems Radio broadcasting Digital communication Analytical models computer networks communication system traffic Digital audio broadcasting

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ETAQA truncation models for the MAP/MAP/1 departure process

ETAQA truncation models for the MAP/MAP/1 departure process

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International Conference on the Quantitative Evaluation of systems (QEST)

作者： A. Heindl Q. Zhang E. Smirni Computer Networks and Communication Systems University of Erlangen Nuremberg Erlangen Germany Department of Computer Science College of William and Mary Williamsburg VA USA

We propose a family of finite approximations for the departure process of a MAP/MAP/1 queue. The departure process approximations are derived via an exact aggregate solution technique (called ETAQA) applied to quasi-birth-death processes (QBDs) and require only the computation of the frequently sparse fundamental-period matrix G. The approximations are indexed by a parameter n, which determines the size of the output model as n-1 QBD levels. The marginal distribution of the true departure process and the lag correlations of the interdeparture times up to lag n+1 are preserved exactly. Via experimentation we show the applicability of the proposed approximation in traffic-based decomposition of queueing networks and investigate how correlation propagates through tandem queues.

关键词： Traffic control Telecommunication traffic Design for quality Queueing analysis computer networks communication systems Autocorrelation computer science Educational institutions Aggregates

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A low-cost infrastructure for high precision high volume performance measurements of web clusters

引用

13th International Conference on Modelling Techniques and Tools for computer Performance Evaluation, TOOLS 2003

作者： Hielscher, Kai-Steffen Jens German, Reinhard Department of Computer Science 7 Computer Networks and Communication Systems University of Erlangen-Nürnberg Martensstraße 3 ErlangenD-91058 Germany

ISBN: (纸本)3540408142

We present a software monitoring infrastructure for distributed web servers for precise measurements of one-way delays of TCP packets to parameterize, validate and verify simulation and state-space based models of the system. A frequency synchronization of the clocks is not sufficient, both frequency and phase (offset) of all clocks have to be in sync to correctly estimate distributions of the involved delays. We present a cost-effective combination of standard methods with own additions and improvements to achieve this goal. The solution we developed is based on using only one GPS receiver in combination with NTP and the PPS-API for the time synchronization of all object systems' clocks with a precision in the range of one microsecond. The timestamping and generation of the event trace is done in a Linux kernel module. In addition, example measurements generated with our infrastructure are presented. © Springer-Verlag Berlin Heidelberg 2003.

关键词： Clocks

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ParEs - aparameter-estimation-tool

ParEs - aparameter-estimation-tool

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International Conference on Dependable systems and networks (DSN)

作者： F. Engelhard S. Greiner R. German System Safety Road Vehicles DaimlerChrysler Aerospace Germany Department of Computer Science 7 (Computer Networks and Communication Systems) University of Erlangen-Nuremberg Germany

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