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IEEE Globecom 2006

作者： Si Yin Yuanqiu Luo Nirwan Ansari Ting Wang Advanced Networking Laboratory Department of Electrical and Computer Engineering New Jersey Institute of Technology University Heights Newark NJ USA NEC Laboratories of America Inc. Princeton NJ USA

This paper addresses the issue of bandwidth allocation over Ethernet passive optical networks (EPONs). We develop a state space model to evaluate the controllability of available bandwidth allocation schemes. We show that the predictor-based scheme is completely controllable when the loaded network traffic changes dynamically, while other schemes are either partially controllable or uncontrollable.

关键词： Channel allocation Controllability Optical network units Bandwidth Traffic control State-space methods EPON Optical buffering Communication system traffic control Laboratories

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A novel modified secant method for computing the fair share rate

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Journal of Computing and Information Technology 2005年第3期13卷 247-254页

作者： Wei, Dong Ansari, Nirwan Advanced Networking Laboratory Department of Electrical and Computer Engineering New Jersey Institute of Technology NewarkNJ07102 United States

In this paper, we propose a novel modified secant method to compute the flow fair share rate within the framework of the core-stateless fair queueing [1]. The geometric explanation and numerical results demonstrate th... 详细信息

关键词： Convergence of numerical methods

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Secure, redundant, and fully distributed key management scheme for mobile ad hoc networks: An analysis

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Eurasip Journal on Wireless Communications and networking 2005年第4期2005卷 579-589页

作者： Joshi, Deepti Namuduri, Kamesh Pendse, Ravi Department of Electrical and Computer Engineering Wichita State University Wichita KS 67260 United States Electrical and Computer Engineering Department Wichita State University Wichita KS IEEE Advanced Networking Research Center Wichita State University Wichita KS

Security poses a major challenge in ad hoc networks today due to the lack of fixed or organizational infrastructure. This paper proposes a modification to the existing "fully distributed certificate authority" scheme for ad hoc networks. In the proposed modification, redundancy is introduced by allocating more than one share to each node in order to increase the probability of creating the certificate for a node in a highly mobile network. A probabilistic analysis is carried out to analyze the trade-offs between the ease of certificate creation and the security provided by the proposed scheme. The analysis carried out from the intruder's perspective suggests that in the worst-case scenario, the intruder is just "one node" away from a legitimate node in compromising the certificate. The analysis also outlines the parameter selection criteria for a legitimate node to maintain a margin of advantage over an intruder in creating the certificate.

关键词： Wireless telecommunication systems

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Enhanced probabilistic packet marking for IP traceback

Enhanced probabilistic packet marking for IP traceback

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GLOBECOM'05: IEEE Global Telecommunications Conference, 2005

作者： Zhiqiang, Gao Ansari, Nirwan Advanced Networking Laboratory Department of Electrical and Computer Engineering New Jersey Institute of Technology Newark NJ 07102 United States

ISBN: (纸本)0780394143

A novel mechanism based on Probabilistic Packet Marking (PPM) for IP traceback is presented. Our proposal enhances the performance of PPM in the following aspects. First, PPM can effectively trace Denial of Service (DoS) attacks and small-scale Distributed DoS (DDoS) attacks only while our proposal may also be used to tackle large-scale DDoS attacks. Second, our scheme eliminates a serious vulnerability of PPM, i.e., spoofed marking inscribed by the attacker intentionally. Third, by optimizing the marking probability and refining the marking mechanism, our scheme can significantly reduce the number of packets required for path reconstruction. In comparison with PPM, as many as 41.31% of marked packets required for a single path reconstruction may be reduced using our scheme. © 2005 IEEE.

关键词： Network protocols

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Survivable GMPLS networks with QoS guarantees

Survivable GMPLS networks with QoS guarantees

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作者： Luo, Y. Ansari, N. Advanced Networking Lab Department of Electrical and Computer Engineering New Jersey Institute of Technology Newark NJ 07102 United States

A scheme is proposed to provide multiple QoS guarantees for survivable generalised multiprotocol label switching (GMPLS) networks. The shared risk link group (SRLG) information is considered to provide failure-independent protection. Based on the problem formulation, the service level agreement (SLA) parameters, such as the expected recovery failure probability, the expected recovery time and the expected signal loss are analysed to reveal the bound of the backup path length. Under the constraint of such a backup path length limit, a heuristic algorithm is further proposed for online path configuration. The simulation results demonstrate that the heuristic algorithm provides recovery quality guaranteed backup paths with high bandwidth multiplexing gain. © IEE, 2005.

关键词： Telecommunication networks

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An architectural framework and tool for modeling grids

An architectural framework and tool for modeling grids

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2005 Applied Telecommunication Symposium: Modeling and Simulation Challenges in Telecommunication Systems, ATS 2005, Part of the 2005 Spring Simulation Multiconference, SpringSim 2005

作者： Bragg, Arnold Baldine, Ilia Stevenson, Dan Perros, Harry Devetsikiotis, Mike MCNC Research and Development Institute Advanced Networking Research Division Box 13910 3021 Cornwallis Road Research Triangle Park NC 27709 United States Computer Science Department United States Electrical and Computer Engineering Department North Carolina State University Raleigh NC 27695 United States

A Grid is a family of technologies for dynamically and opportunistically provisioning computing power from a pool of resources. Enterprise-level Grids are beginning to be deployed, and researchers are investigating a number of novel Grid applications and services. Grid deployments are expected to grow exponentially at least through 2010. Grids are enormously complex computing systems. They have large numbers of geographically dispersed resources at their disposal, and they lack some characteristics of earlier computing systems that simplified the analysis of those systems - e.g., homogeneous and closely-coupled components, low-latency communications paths, global state maintenance, and deterministic controls. Performance analysts need new analytical methods and tools in order to understand the dynamic behavior of Grid components at various protocol layers and time scales, and to gain insight about the complex interactions among the components - functionally, spatially, and temporally. We describe an architectural framework for modeling and analyzing the performance of Grid applications and services, and we propose a tool design based on the framework. The framework and tool address all of the components that are relevant to Grid performance - hardware, middleware, infrastructure, services, applications, traffic - and the complex interrelationships among them.

关键词： Computing power

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Enhanced probabilistic packet marking for IP traceback

Enhanced probabilistic packet marking for IP traceback

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IEEE Conference and Exhibition on Global Telecommunications (GLOBECOM)

作者： Zhiqiang Gao N. Ansari Advanced Networking Laboratory Department of Electrical and Computer Engineering New Jersey Institute of Technology Newark NJ USA

A novel mechanism based on probabilistic packet marking (PPM) for IP traceback is presented. Our proposal enhances the performance of PPM in the following aspects. First, PPM can effectively trace denial of service (DoS) attacks and small-scale distributed DoS (DDoS) attacks only while our proposal may also be used to tackle large-scale DDoS attacks. Second, our scheme eliminates a serious vulnerability of PPM, i.e., spoofed marking inscribed by the attacker intentionally. Third, by optimizing the marking probability and refining the marking mechanism, our scheme can significantly reduce the number of packets required for path reconstruction. In comparison with PPM, as many as 41.31% of marked packets required for a single path reconstruction may be reduced using our scheme.

关键词： computer crime Intrusion detection Filtering Proposals Large-scale systems Web and internet services IP networks computer worms Network servers Web server

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Fair bandwidth allocation for assured forwarding (AF) services

Fair bandwidth allocation for assured forwarding (AF) servic...

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IEEE International Conference on Communications (ICC)

作者： Li Zhu N. Ansari Advanced Networking Laboratory Department of Electrical and Computer Engineering New Jersey Institute of Technology Newark NJ USA

Fair bandwidth allocation is one of the most challenging. research issues in the context of assured forwarding (AF) in the Differentiated Services (DiffServ) networks. There exist many works that tried to assure the fairness of bandwidth allocation. However, these works only focused on studying the simple case, in which multiple AF flows share a single bottleneck link, and they also lacked a solid theoretical analysis to validate themselves. In this paper, we propose a network-assist packet marking (NPM) scheme to offer fair bandwidth allocation among multiple aggregates. By both theoretical analysis and experimental evaluation, we demonstrate that NPM can fairly distribute bandwidth among these aggregates in both single and multiple bottleneck link networks.

关键词： Channel allocation Aggregates Traffic control Diffserv networks Bandwidth Telecommunication traffic Subscriptions Context-aware services Information rates Laboratories

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Prioritized traffic recovery over GMPLS networks

Prioritized traffic recovery over GMPLS networks

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IEEE Princeton Section Sarnoff Symposium

作者： Yuanqiu Luo N. Ansari Advanced Networking Laboratory Department of Electrical and Computer Engineering New Jersey Institute of Technology Newark NJ USA

The paper proposes a prioritized traffic recovery model for generalized multiprotocol label switching (GMPLS) networks. The network traffic is differentiated into four classes, with the highest prioritized class achieving dedicated protection, the second prioritized class obtaining shared restoration, the third prioritized class attaining on-line restoration, and no recovery for the lowest prioritized class. The QoS performance of such a model is evaluated by extensive simulations. The results show that delay sensitive traffic receives the fastest recovery service, throughput sensitive traffic with light load takes a longer recovery time, and the throughput sensitive traffic with heavy load experiences the lowest recovery service

关键词： Telecommunication traffic Traffic control Communication system traffic control Throughput Gold Silver Multiprotocol label switching Protection Packet switching Laboratories

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Bandwidth management and delay control over EPONs

Bandwidth management and delay control over EPONs

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IEEE Workshop on High Performance Switching and Routing

作者： Yuanqiu Luo N. Ansari Advanced Networking Laboratory Department of Electrical and Computer Engineering New Jersey Institute of Technology Newark NJ USA

Ethernet passive optical networks (EPONs) address the first mile of the communication infrastructure between the service provider central offices and the customer sites. As a low-cost, high-speed technology, EPONs are deemed as the solution to the bottleneck problem of the broadband access network. This paper proposes a dynamic bandwidth allocation scheme to control the data delay over the EPON upstream channel. The theoretical analysis of the average delay and the delay reduction, in conjunction with the extensive simulations, demonstrates that our scheme provides effective data delay control over EPONs.

关键词： Bandwidth EPON Optical network units Channel allocation Central office Delay effects Communication system control High speed optical techniques Optical fiber networks Passive optical networks

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