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检索条件"任意字段=Conference on All-Optical Communication Systems: Architecture, Control and Network Issues"

共 2534 条记录，以下是1811-1820 订阅

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Adaptive link-layer intelligence for enhanced ad hoc networking

Adaptive link-layer intelligence for enhanced ad hoc network...

引用

conference on Sensors, and Command, control, communications, and Intelligence (C31) Technologies for Homeland Security and Homeland Defense IV

作者： MacLennan, J Walburg, B Nevins, L Hartup, D Nova Engn Cincinnati OH 45246 USA

ISBN: (纸本)0819457639

networked radio systems that utilize self-forming, fault tolerant techniques offer needed communication functions for Homeland Security and Law Enforcement agencies. The use of an ad hoc mesh network architecture solves some of the problems inherent to the wireless physical layer such as interferers, multi-path fading, shadowing, and loss of line-of-site. These effects severely limit the performance of current 802.11 wireless network implementations. This paper describes the use of Adaptive Link-layer Intelligence for Enhanced ad hoc networking. This technology enhances recognition and characterization of sources of wireless channel perturbations and predicts their effects on wireless link quality. Identifying and predicting channel problems at the link level improves dynamic route discovery, circumvents channel disruptions before they cause a link failure, and increases communications reliability and data rate. First Responders, Homeland Security, and Law Enforcement agencies operating in locations lacking infrastructure, such as Urban Search and Rescue (USAR) operations, can benefit from increased communications reliability in highly impaired channels that are typical in disaster response scenarios.

关键词： mobile ad hoc network MANET Hidden Markov Model link quality search and rescue robot first responder communication link throughput

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IFIP TC6 / WG6.10 1st optical networks and Technologies conference, OpNeTec 2004

引用

IFIP TC6/WG6.10 1st optical networks and Technologies conference, OpNeTec 2004

ISBN: (纸本)0387231773

The proceedings contain 78 papers. The special focus in this conference is on optical networks and Technologies conference. The topics include: Developments in optical seamless networks;cinema-class digital content distribution via optical networks;an overview of key technologies for the next generation networks;a framework for the analysis of delay jitter in optical packet switched networks;demonstration of preamble less optical packet clock and data recovery with optical packet switching;cost efficient upgrading of OPS nodes;overview of a packet-switched MAN architecture;performance of optical burst switched WDM ring network with TTFR system;assessing the benefits of wavelength selection vs. wavelength conversion in WDM networks;distributed wavelength reservation method for fast lightpath setup in WDM networks;on-arrival planning for sub-graph routing protection in WDM networks;semi-lightpath approach for bandwidth guaranteed protection in IP-over-WDM networks;GMPLS with interlayer control for session-uninterrupted disaster recovery across distributed data centers;a centralized path computation system for GMPLS transport networks;intelligent OTN in the TLC operator infrastructures;novel active monitoring of customer premises using Bluetooth in optical access network;a multilayer-routing-strategy with dynamic link resource adaptation;evaluation of bandwidth-dependent metrics for TE links in a GMPLS path computation system;a new traffic aggregation scheme in all-optical wavelength routed networks;multi-layer recovery enabled with end-to-end signaling;performance analysis of the control and forwarding plane in an MPLS router;inter-domain routing in optical networks;optical network unit based on a bidirectional reflective semiconductor optical amplifier;optical feedback buffering strategies;multiple wavelength conversion for WDM multicasting by means of non-linear effects in SOAs;optimal span length determination in transmission systems with hybrid amplification;suppr

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Hybrid networks with a space segment - Topology design and security issues

Hybrid networks with a space segment - Topology design and s...

引用

MILCOM 2005: Military communications conference 2005

作者： Roy-Chowdhury, Ayan Baras, John S. Hadjitheodosiou, Michael Rentz, Nicolas Electrical and Computer Engineering Institute for Systems Research University of Maryland College Park MD 20742 INP Grenoble Telecom 38402 St Martin d Heres Cedex France

ISBN: (纸本)0780393937

In this paper we investigate a hybrid network topology that is suitable for supporting interplanetary communications. We define an architecture comprised of a network of sensor nodes on a remote planetary surface, connected to a hybrid terrestrial network of wired and wireless LANs through a series of satellite relays. all the nodes in the network are IP-addressable and support public and symmetric key cryptography. The resulting network forms a hierarchical hybrid mesh that connects users on Earth to networks on or around a remote planetary surface. We describe the design of the network and present preliminary simulation results illustrating the network performance for various parameters. We also discuss how algorithms for user authentication, message integrity and data confidentiality can be incorporated in the network infrastructure for secure end-to-end communication.

关键词： Telecommunication networks

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Adaptive link weight assignment and random early blocking algorithm for dynamic routing in WDM networks

Adaptive link weight assignment and random early blocking al...

引用

IASTED International conference on optical communication systems and networks

作者： Chang, Ching-Lung Lee, Yan-Ying Lee, Steven S. W. Natl Yunlin Univ Sci & Technol Dept Elect Engn Yunlin Taiwan

ISBN: (纸本)0889864950

In order to use WDM networks efficiently, a lightpath is dynamically established upon the arrival of a connection request. Dynamic routing is usually determined by conventional shortest path algorithm. Different link weight assignment results in different routing and network performance. In this work, we propose a new weight assignment scheme in which link weights are proportional to the exponential of link utilization. It is used to differentiate network in different traffic loads so as to arrive load balanced routing. Based on the assignments, one adaptive routing algorithm referred to as Exponential Weighted Shortest Feasible Path (EWSFP) is presented. Furthermore, to avoid consuming too much network resources by a path with large hop count, a new call control algorithm named Random Early Blocking (REB) is proposed. By randomly rejecting calls with long routing path in heavy load, the whole network blocking probability can be greatly improved. Moreover, to balance the favor of short distance calls, a fair version of REB (called FREB) is presented in the paper. Extensive simulations are performed to evaluate the performance among different schemes. Compared to well-known shortest feasible path routing and weighted feasible shortest path routing, EWSFP achieves lowest call blocking probability. In cooperation with REB, all of the three adaptive routing approaches can significantly improve their performance. Among them the EWSCP+REB scheme outperforms all of the others. Simulation results also reveal that the FREB can obtain fairness among calls with different distances by only sacrificing a little blocking performance.

关键词： WDM network dynamic routing blocking probability fairness routine exponential weighted shortest feasible path routing random early blocking

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Mobile wireless network for the urban environment

Mobile wireless network for the urban environment

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conference on Unmanned Ground Vehicle Technology VII

作者： Budulas, P Luu, B Gopaul, R USA Res Lab ARL AMSRDCICN Adelphi MD 20783 USA

ISBN: (纸本)0819457892

As the Army transforms into the Future Force, particular attention must be paid to operations in Complex and Urban Terrain. Our adversaries increasingly draw us into operations in the urban environment and one can presume that this trend will continue in future battles. In order to ensure that the United States Army maintains battlefield dominance, the Army Research Laboratory (ARL) is developing technology to equip our soldiers for the urban operations of the future. Sophisticated soldier borne systems will extend sensing to the individual soldier, and correspondingly, allow the soldier to establish an accurate picture of their surrounding environment utilizing information from local and remote assets. Robotic platforms will be an integral part of the future combat team. These platforms will augment the team with remote sensing modalities, task execution capabilities, and enhanced communication systems. To effectively utilize the products provided by each of these systems, collected data must be exchanged in real time to all affected entities. Therefore, the Army Research Laboratory is also developing the technology that will be required to support high bandwidth mobile communication in urban environments. This technology incorporates robotic systems that will allow connectivity in areas unreachable by traditional systems. This paper will address some of the issues of providing wireless connectivity in complex and urban terrain. It will further discuss approaches developed by the Army Research Laboratory to integrate communications capabilities into soldier and robotic systems and provide seamless connectivity between the elements of a combat team, and higher echelons.

关键词： mobile ad-hoc network MANET mobile tactical networks urban communications

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Optics InfoBase conference Papers

Optics InfoBase Conference Papers

引用

optical Fiber communication conference, OFC 2005

ISBN: (纸本)1557527849

This proceedings contains 632 papers. OFC is the largest global conference and exposition for optical communications and networking professionals. It brings you the thought leaders and solutions providers ready with the cutting edge ideas and fiber optic solutions to enhance your systems and revolutionize your network. The key terms of this proceedings include distributed polarization control, wavelength division multiplexing, concave fiber mirror, regeneration in the receiver, all-fiber delay line filter, buffers using slow light, slow-light optical buffers, fast polarization scrambling and aperiodically poled lithium niobate.

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A study and implementation of a new Overlay Multicast Service network

A study and implementation of a new Overlay Multicast Servic...

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9th World Multi-conference on Systemics, Cybernetics and Informatics

作者： Wu, Jiagao Chen, Yixin Yang, Yinying Southeast Univ Dept Comp Sci & Engn Nanjing 210096 Peoples R China

ISBN: (纸本)9789806560543

Multicasting at the IP layer has not been adopted due to a combination of technical and economic issues. This has led to many recent efforts to focus on overlay multicast in which end systems perform all multicast communication functionalities instead of IP routers. In this paper, we propose a new proxy-based architecture of overlay multicast, which is called Overlay Multicast Service network (OMSN). Different from the previous works, OMSN adopts both DHT-based P2P and tree-first routing protocols, that is, the P2P protocol for system management and the tree-first protocol for data distribution respectively. Thus, the system can not only keep high scalability, but also provide high effective QoS routing. In addition, using an XML-based mechanism of service customization, OMSN can deliver different formats of multimedia streams to clients with different QoS requirements. A prototype of OMSN is also implemented. Our initial experience indicates that the prototype can meet the system goal of providing a scalable, effective and adaptable multicast service platform.

关键词： overlay network overlay multicast peer-to-peer tree-first multimedia

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Collision avoidance in metropolitan optical access networks

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IFIP TC6/WG6.2, 6.6, 6.7 and 6.8 3rd International conference on network control and Engineering for QoS, Security and Mobility, NetCon 2004

作者： Bouabdallah, Nizar Beylot, Andre-Luc Pujolle, Guy LIP 6 University of Paris 6 8 rue du Capitaine Scott F-75015 Paris France ENSEEIHT-IRIT TeSA Lab 2 rue C. Camichel BP7122 F-31071 Toulouse France Alcatel Research and Innovation Route de Nozay F-91460 Marcoussis France

ISBN: (纸本)0387231978

Packet-based optical ring becomes the standard access medium in metropolitan networks. Its performance depends mainly on how optical resource sharing, among different competing access nodes, takes place. This network architecture has mostly been explored in regard to synchronous transmission. However, in the present paper, we focus on the performance of asynchronous transmission-based metropolitan networks with variable packet sizes. Analytical models are presented in an attempt to provide explicit formulas that express the mean access delay of each node of the bus-based optical access network. In addition, we prove that in such a network, fairness problems are likely to arise between upstream and downstream nodes sharing a common data channel. Furthermore, we show that sharing the available bandwidth fairly and arbitrarily between access nodes, as in slotted WDM rings, does not resolve the fairness problem in asynchronous system. A basic rule, in order to achieve fairness, consists in avoiding random division of the available bandwidth caused by the arbitrary transmission of the upstream nodes. © 2005 by International Federation for Information Processing.

关键词： network architecture

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Integrated handoff scheme of FMIPv6 and MAC protocol in 4th generation systems

Integrated handoff scheme of FMIPv6 and MAC protocol in 4th ...

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7th International conference on Advanced communication Technology, ICACT 2005

作者： Kim, Woo-Jae Kwon, Dong-Hee Sun, Young-Joo Pohang 790-784 Korea Republic of

ISBN: (纸本)8955191235

Recently, motivated by users demands for higher mobility and bandwidth, there are active researches on 4G systems. The requirements of 4G systems are all-IP based networks with cellular architecture and IP mobility supports to users. In this network, the L2 handoff scheme should be designed carefully and consider the L3 handoff scheme to reduce the handoff latency. The L2 and L3 handoff schemes in current wireless networks are performed separately, keeping the layer independence, which results in longer handoff latency. In this paper, we analyze handoff schemes of current wireless networks and design the handoff scheme for a 4G system including a handoff detection method. An integration method of the FMIPv6 protocol with the proposed L2 handoff scheme is also proposed, which can reduce the handoff latency and the number of control messages exchanged between the MN and the network.

关键词： network protocols

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IFIP International conference on network and Parallel Computing, NPC 2005

IFIP International Conference on Network and Parallel Comput...

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IFIP International conference on network and Parallel Computing, NPC 2005

ISBN: (纸本)354029810X

The proceedings contain 73 papers. The special focus in this conference is on Grid computing, Peer-to-Peer computing, Web techniques, Cluster computing, Parallel programming and environment and network architecture. The topics include: An adaptable stream-integrated grid monitoring system;performance modeling and analysis for resource scheduling in data grids;study on π-calculus based equipment grid service chain model;a performance-based parallel loop self-scheduling on grid computing environments;a resource-based server performance control for grid computing systems;an index-based XML parser model;a stochastic control model for hierarchical grid service;service-based grid resource monitoring with common information model;distributed gridflow model and implementation;a secure P2P video conference system for enterprise environments;adaptive query-caching in peer-to-peer systems;design and deployment of locality-aware overlay multicast protocol for live streaming services;dynamic thread management in kernel pipeline web server;QoS aware service composition with multiple quality constraints;performance modelling and optimization of memory access on cellular computer architecture Cyclops64;a parallel file system based on spatial information object;topology-aware multi-cluster architecture based on efficient index techniques;a parallel routing algorithm on circulant networks employing the hamiltonian circuit latin square;an efficient load balancing algorithm for cluster system;a greedy algorithm for capacity-constrained surrogate placement in CDNs;an improved scheme of wavelength assignment for parallel FFT communication pattern on a class of regular optical networks and distributed active measuring link bandwidth in IP networks.

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