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21st International communications Satellite systems conference and Exhibit, ICSSC 2003

作者： Zeng, Hui Hadjitheodosiou, Michael Center for Satellite and Hybrid Communication Networks University of Maryland College Park MD 20742 United States

ISBN: (纸本)9781624100932

We discuss traffic and dynamic access issues related to the migration to future dynamic communication support for NASA missions. In this scenario, a number of spacecraft, each with several instruments on-board, are sending data to a ground station through a relay system. To meet the objective of bandwidth-efficient support for the downlink channel with good performance in end-to-end delay and throughput, we study and develop simple models of the spacecraft-generated science traffic, and investigate different medium access control (MAC) schemes. Then a hybrid-mode reservation-based TDMA protocol is proposed and its performance is compared with that of a fixed-assignment scheme by using the simulation. The simulation results demonstrate that our frame-based scheme is suitable and has potential advantages for the next generation NASA communications network with more dynamic traffic loads and larger number of users. © 2003 by the American Institute of Aeronautics and Astronautics, Inc. all rights reserved.

关键词： NASA

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North port said concession 36" intersinai gas pipeline scada system and fiber optic as communication data high way (Case History)

North port said concession 36" intersinai gas pipeline scada...

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Offshore Mediterranean conference and Exhibition 2003, OMC 2003

作者： El-Hamid, A. Abd El-Salam, A. Abd Petrobel Egypt

ISBN: (纸本)9788894043662

Egypt has many gas discoveries in the recent years, mainly located in the Mediterranean Sea with too many reserves. Such discoveries exceed Egypt's demand of natural gases during the next years and consequently, Egypt thought of gas exportation to the foreign countries as natural gas by means of pipeline and / or by containers after lequification process. Inter-Sinai gas pipeline (36") represents the first step to put Egypt on the natural gas exportation map and also to provide gas for industrial areas located in the North Port Said. Until now such pipeline is taking gas from El-Gamil Plant (located in North Port Said) to El-Arish terminal (located at north Sinai). This pipeline will be connected to the main trunk exportation pipeline starting from Egypt and passing through Gordon, Lebanon and Syria (under completion). Along this pipeline one Fiber Optic cable establishes the communication data high way path between SCADA (Supervisory control And Data Acquisition System) stations, El-Gamil control center and El-Arish main control center. Such part of communication path is a branch of telecommunication network covering all Egypt gas distribution pipelines. In this paper we will go through the following points: communication network covering most of Egypt and connecting all main control centers along the gas distribution pipeline. Fiber optic communication which is used as data high way communication path and its main advantages compared to the other communication systems such as two wires communication, Antenna communication,...etc. The future possible uses of such optical fiber cable such as connection between any telephone centers along the pipeline (230 Km.) and also to provide any consumer with the communication link to all the world at the minimum cost. © OMC 2003.

关键词： Gases

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IFIP TC6 / WG6.2 and WG6.7 2nd International conference on network control and Engineering for QoS, Security and Mobility, Net-Con 2003

IFIP TC6 / WG6.2 and WG6.7 2nd International Conference on N...

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IFIP TC6 / WG6.2 and WG6.7 2nd International conference on network control and Engineering for QoS, Security and Mobility, Net-Con 2003

ISBN: (纸本)9781475759501

The proceedings contain 20 papers. The special focus in this conference is on network control and Engineering for QoS, Security and Mobility. The topics include: A scalable multi cast protocol with QoS guaranties;analysis of policy management models and specification languages;DiffServ network control using a behavioral multi-agent system;policy based handover in wireless and mobile networks;teletraffic engineering of multi-band W -CDMA systems;mobility support framework in adaptable service architecture;ant -routing-algorithm for mobile multi-hop ad-hoc networks;resource management in ASMA platform;a new hardware algorithm for fast IP routing targeting programmable routers;fuzzy-logic-based TCP congestion control system;buffer occupancy analysis for a broadband polling-based WLAN;service level agreement in optical networks;conceptual foundations of user preference modeling;new key management protocol for SSL/TLS and management of security in TCP/IP rosts using dedicated monitoring applications.

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Circuit/wavelength switching and routing: Report of the achievements of the COST-action 266 7

Circuit/wavelength switching and routing: Report of the achi...

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7th International conference on Telecommunications, ConTEL 2003

作者： De Maesschalck, Sophie Colle, Didier Puype, Bart Yan, Qiang Pickavet, Mario Demeester, Piet Cinkler, Tibor Mauz, Christian Köhn, Martin Gauger, Christoph M. Sanchez-Lopez, Sergio Masip-Bruin, Xavi Sole-Pareta, Josep Tomic, Slobodanka Ljolje, Marije Lackovic, Marko Inkret, Robert Mikac, Branko Schupke, Dominic Mattiello, Mario Ghent University IMEC Ghent Belgium High-Speed Netw. Lab. Dept. of Telecomm. and Telematics Budapest Univ. of Techn. and Econom. Budapest Hungary Communication Technology Laboratory ETH Zurich Zurich Switzerland University of Stuttgart Stuttgart Germany Departament d'Arquitectura de Computadors Universitat Politecnica de Catalunya Barcelona Spain TU Wien Vienna Austria Department of Telecommunications Faculty of Electrical Engineering and Computing Zagreb Croatia Institute of Communication Networks Munich University of Technology Munich Germany Laboratoire des Télécommunications EPF - Lausanne Lausanne Switzerland

ISBN: (纸本)9531840520

This paper gives an overview of the work carried out during the course of the COST-266 action on circuit/wavelength switched network studies. Several subjects are discussed in detail in this paper. A first important topic deals with the different control plane models in single- and multi-domain networks. A second important issue is the routing and wavelength assignment problem, both in networks with static and dynamic traffic demands. Also the IP-over-OTN network architecture, envisaged to be the network architecture most suited for future transport networks, is discussed. Finally the study on optical virtual private networks is presented. © 2003, Institute of Electrical and Electronics Engineers Inc. all rights reserved.

关键词： network architecture

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Proceedings - International conference on Computer communications and networks, ICCCN

Proceedings - International Conference on Computer Communica...

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12th IEEE International conference on Computer communications and networks, ICCCN 2003

ISBN: (纸本)0780379454

The proceedings contain 93 papers. The topics discussed include: routing anomaly detection in mobile ad hoc networks;a novel caching scheme for internet based mobile ad hoc networks;a hybrid optical network architecture consisting of optical cross connects and optical burst switches;single- and multi-path logical topology design and traffic grooming algorithm in IP over WDM networks;multicast loss recovery with active injection;scheduling in wireless cellular networks under probabilistic channel information;call admission control in mobile cellular systems using fuzzy associative memory;peer-to-peer approach for global deployment of voice over IP service;protocol for peer-to-peer networking in mobile environments;an approach of integrating SIP in converged multimodal/multimedia communication services;adaptive AIMD rate control for smooth multimedia streaming;dial-controlled hash: reducing path oscillation in multipath networks;and achieving delay and throughput decoupling in distributed fair queueing over ad hoc networks.

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Content delivery in future mobile communication networks

Content delivery in future mobile communication networks

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Proceedings of the First International conference on Advanced Satellite Mobile systems - ASMS 2003

作者： Jonas, Karl Raber, Sergey Fraunhofer FOKUS Schloss Birlinghoven St Augustin 53757 Germany University of Applied Science Grantham-Allee 20 St. Augustin 5375 Germany

With the fast progress in the deployment of wireless networks during the last few years, the global communication market requires the development of new methods for content delivery towards mobile users. It is currently characterized by the introduction of the 3rd generation of terrestrial mobile networks based on 3GPP's UMTS standard. It is expected that this will eventually lead to integrated all-IP-based infrastructures supporting a variety of radio access technologies (so-called beyond-3G-networks or 4th Generation networks). The integration of mobility support, security and accounting and provisioning of differentiated qualities of service are among the issues which are currently researched in the 4G framework. Since it is not possible to change network protocols and infrastructure at once in order to optimize them for mobile services, it is very important to find an appropriate way for the migration from the current infrastructure towards an integrated architecture, where fixed and mobile networks coexist and interoperate in the most effective and flexible way. The integration of satellite communication networks into the terrestrial mobile communication environment is the focus of R&D activities at the Competence Centre for Advanced Satellite communication of the FhG FOKUS institute. These activities are presented in this article, with a focus on the CoDeSat Content Delivery over Satellite project. In the remainder of this article we first summarize services and service requirements as they are considered in our work. We then discuss the challenges derived from these requirements with respect to current network and protocol architectures. Finally, we describe our approach, and the current status of our prototype implementation.

关键词： Telecommunication networks

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Global implementation of ERP software - Critical success factors on upgrading technical infrastructure

Global implementation of ERP software - Critical success fac...

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IEEE International Engineering Management conference

作者： Ghosh, S Ghosh, S ITT Ind Washington DC 20024 USA

ISBN: (纸本)0780381505

Implementing an Enterprise Resource planning (ERP) software in a global environment, executive sponsors face two key challenges. While business processes are to he re-engineered to align with the ERP software best practices [1], [2], technical architecture and infrastructure needs to be in place globally as per specifications of the packaged software. In the legacy environment, different countries or different business units use different systems, based on local standards supported by local resources. In the new ERP world, globally all the countries must conform to same technical infrastructure. Practical experience suggest that often business process reengineering and technical infrastructure upgrade become two independent projects, business side being lead by individual business managers while the other one being lead by technology managers. When this happens, it leads to a frustrating situation for business managers not being able to test the full life cycle of some of the business processes. Technical managers face multiple critical issues implementing a global solution: to bring different countries at different levels of technical advancement to a common level, implement appropriate communication infrastructure to support global data traffic, consolidating multiple instances [3] and support centralized environment available round the clock to facilitate a holistic view of global business from different time zones. Most of the ERP software are developed in technically advanced countries, standards are often too high for under developed or developing countries. In an effort to bring the global organization to a common platform different countries needs different levels of upgrades. In this paper authors review key technical issues faced is a global upgrade process to support a global ERP implementation and how to resolve those. To minimize costs, like the business managers [2], technical managers of global corporations must also use metanational advantages [4]. W

关键词： globalization ERP network technology management critical success factors (CSF)

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Progressive introduction of optical packet-switching techniques in WDM networks

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Alcatel Telecommunications Review 2003年第3期 216-219页

作者： Vandenhoute, Marc Masetti, Francesco Jourdan, Amaury Chiaroni, Dominique Optical Networking Unit Alcatel's Network Strategy Group Network Architecture Richardson TX United States Strategic Core Routing Project Alcatel Res. and Innovation Center Richardson TX United States Photonic Networks Research Unit Marcoussis France Metropol. Networks R/I Strat. Proj. Optical Switching Systems Alcatel Res. and Innovation Center Marcoussis France

The growing use of optical packet-switching techniques in wavelength division multiplexing (WDM) networks is reported. The optical wavelength-switched networks provide high degree of network capacity growth. However, these networks suffer from many of the scalability issues. The introduction of optical transparency and the separation of data and control can lead to effective introduction of transparent end-to-end optical burst switching.

关键词： optical communication

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Agile all-photonic networks

Agile all-photonic networks

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IEEE Photonics conference (IPC)

作者： D.V. Plant Department of Electrical and Computer Engineering Montreal QUE Canada

The goal of this study is to develop an all-optical photonic network core that stretches as close as possible to the end-user. A practical paradigm for achieving an agile all-photonic network (AAPN) should contain the following: (1) rapidly reconfigurable all-optical space-switching in the core, (2) agility-the ability to perform time domain multiplexing to dynamically allocate bandwidth to traffic flows as the demand varies, and (3) control and routing functionality concentrated at the edge switches that surround the photonic core. At the system level, the photonic network requires dramatic advances in network monitoring and control and demands a completely new approach to topology and switch architecture design. Moreover, the development of a realistic photonic networking solution is only achievable if there is an ongoing and intimate dialogue between researchers exploring physical layer enabling technologies and those proposing network architectures, algorithms, and protocols.

关键词： Switches optical control Bandwidth communication system traffic control Routing Monitoring control systems network topology Photonics Physical layer

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network layer support for service discovery in mobile ad hoc networks

Network layer support for service discovery in mobile ad hoc...

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22nd Annual Joint conference on the IEEE Computer and communications Societies

作者： Kozat, Ulas¸ C. Tassiulas, Leandros Department of Electrical Engineering Institute for Systems Research University of Maryland College Park MD 20742 United States

ISBN: (纸本)0780377524

Service discovery is an integral part of the ad hoc networking to achieve stand-alone and self-configurable communication networks. In this paper, we discuss possible service discovery architectures along with the required network support for their implementation, and we propose a distributed service discovery architecture which relies on a virtual backbone for locating and registering available services within a dynamic network topology. Our proposal consists of two independent components: (i) formation of a virtual backbone and (ii) distribution of service registrations, requests, and replies. The first component creates a mesh structure from a subset of a given network graph that includes the nodes acting as service brokers and a subset of paths (which we refer as virtual links) connecting them. Service broker nodes (SBNs) constitute a dominating set, i.e. all the nodes in the network are either in this set or only one-hop away from at least one member of the set. The second component establishes sub-trees rooted at service requesting nodes and registering servers for efficient dissemination of the service discovery probing messages. Extensive simulation results are provided for comparison of performance measures, i.e. latency, success rate, and control message overhead, when different architectures and network support mechanisms are utilized in service discovery.

关键词： Telecommunication networks

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