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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1961-1970 订阅

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Architectural framework for resource management optimization over heterogeneous wireless networks

Architectural framework for resource management optimization...

引用

conference on Internet Multimedia Management systems IV

作者： Tselikas, N Kapellaki, S Koutsoloukas, E Venieris, IS Natl Tech Univ Athens Sch Elect & Comp Engn GR-15773 Athens Greece

ISBN: (纸本)0819451258

The main goal of wireless telecommunication world can be briefly summarized as: "communication anywhere, anytime, any-media and principally at high-data rates ". On the other hand, this goal is in conflict with the co-existence of plenty different current and emerging wireless systems covering almost the whole world, since each one follows its own architecture and is based on its particular bedrocks. This results in a heterogeneous depiction of the hyper-set of wireless communications systems. The scope of this paper is to present a highly innovative and scalable architectural framework, which will allow different wireless systems to be interconnected in a common way, able to achieve resource management optimization, augmentation of network performance and maximum utilization of the networks. It will describe a hierarchical management system covering all GSM, GPRS, UMTS and WLAN networks each one individually, as well as a unified and wide wireless telecommunication system including all later, in order to provide enhanced capacity and quality via the accomplished network interworking. The main idea is to monitor all the resources using distributed monitoring components with intention to feed an additional centralized system with alarms, so that a set of management techniques will be selected and applied where needed In parallel, the centralized system will be able to combine the afore-mentioned alarms with business models for the efficient use of the available networks according to the type of user, the type of application as well as the user's location.

关键词： networks General packet radio service Global system for mobile communications network architectures Telecommunications Databases Wireless communications Computer architecture Intelligence systems Internet

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Adaptive handoff algorithm for efficient network resource utilization 17

Adaptive handoff algorithm for efficient network resource ut...

引用

17th International conference on Advanced Information networking and Applications

作者： Ohzahata, S Kimura, S Ebihara, Y Univ Tsukuba Doctoral Program Engn Tsukuba Ibaraki 305 Japan

ISBN: (纸本)0769519067

In this paper we propose an adaptive handoff algorithm based on the "threshold-with-hysteresis." In general, such handoff algorithms are proposed to improve the handoff decision for a specific user Our algorithm aims to provide effective network utilization for all users. To realize the handoff decision based on the mobile nodes, the agent advertisements include information of the congestion status at the base station in the algorithm. For implementing the algorithm to Mobile IP we also propose the system architecture with a QoS mechanism. The simulation experiment shows that our proposed algorithm improves the average handoff blocking rate than the previous method in spite of low overhead of our expansion.

关键词： Base stations communication system control Hysteresis Internet Land mobile radio cellular systems Mobile communication Multimedia communication Resource management Timing Traffic control

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Correlating business needs and network architectures in automotive applications - A comparative case study 5

Correlating business needs and network architectures in auto...

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5th IFAC International conference on Fieldbus systems and their Applications, FeT 2003

作者： Axelsson, Jakob Fröberg, Joakim Hansson, Hans Norström, Christer Strom, Kristian Sand Villing, Björn Volvo Car Corporation AB United States Volvo Construction Equipment Components AB United States Mälardalen Reat-time research Centre Mälardalen University Sweden Volvo Truck Corporation AB Sweden

In recent years, networking issues have become more and more important in the design of vehicle control systems. In the beginning of the 1990s a vehicle control system was built up by 'simple' computer nodes exchanging 'simple' and relatively non-critical data. Today we have moved into distributed vehicle control systems with functions spanning several nodes from different vendors. These systems are running on communication architectures consisting of different types of communication buses providing different functionality, from advanced control to entertainment. The challenge is cost efficient development of these systems, with respect to business, functionality, architecture, standards and quality for the automotive industry. In this article we present three different architectures - used in passenger cars, trucks, and construction equipments. Based on these case studies with different business and functionality demands, we will provide an analysis identifying commonalities, differences, and how the different demands are reflected in the network architectures. Copyright © 2003 IFAC.

关键词： network architecture

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Phased array of phased arrays for free space optical communications

Phased array of phased arrays for free space optical communi...

引用

2003 IEEE Aerospace conference

作者： Serati, Steven Stockley, Jay Boulder Nonlinear Systems. Inc. 450 Courtney Way Lafayette CO 80026 United States

ISBN: (纸本)078037651X

An aperture composed of multiple small apertures has several advantages over a large continuous aperture when practical issues are included in the analysis. For example, a single bullet can easily produce a catastrophic failure of the laser communication link if all the optical gain for the transmitter (or receiver) is derived from a single large-diameter telescope. In addition to battlefield concerns, other naturally-occurring problems for large diameter optical systems exist such as turbulence and scintillation. A distributed aperture, composed of small segments (smaller than the coherence length along the beam path), provides a powerful means for mitigating turbulence effects, particularly if the sub-apertures are dynamic steering elements with independent phase adjustments. This type of capability is available using a phased array of phased arrays (PAPA) architecture, which also provides non-mechanical steering, single and multi-spot beam shaping, and high-power beam combining. This paper discusses some of the attributes and potential problems associated with the PAPA approach. © 2003 IEEE.

关键词： optical communication

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Self organizing wireless sensor networks for structural health monitoring

Self organizing wireless sensor networks for structural heal...

引用

Smart Structures and Materials 2003 conference

作者： Basheer, MR Rao, V Derriso, M Univ Missouri Dept Elect & Comp Engn Rolla MO 65401 USA

ISBN: (纸本)0819448540

A smart sensor node has been developed which has (a) the ability, to sense strain of the structure under observation (b) process this raw sensor data in cooperation with its neighbors and (c) transmit the information to the end user. These sensor nodes are interconnected by a loosely coupled network called sensor network. The network is designed to be self organizing in the sense of establishing and maintaining the inter node connectivity without the need for human intervention. For the envisioned application of structural health monitoring, wireless communication is the most practical solution not only because they,, eliminate interconnecting wires but also for their ability to establish communication links even in inaccessible regions. But wireless network brings with it a number of issues such as interference, fault tolerant self organizing, multi-hop communication, energy efficiency, routing and finally reliable operation in spite of massive complexity of the system. This paper addresses the issue of fault tolerant self organizing in wireless sensor networks. We propose a new architecture called the Redundant Tree network (RTN). RTN is a hierarchical network which exploits redundant links between nodes to provide reliability.

关键词： sensor networks tree network bluetooth smart sensor iBlue

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Direct-multicasting satellite communications system using a multi-carrier and multi-rate modem

Direct-multicasting satellite communications system using a ...

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

作者： Yoshitake, Hideto Tabata, Masaaki Kawazoe, Katsuhiko Kazama, Hiroshi NTT Service Integration Laboratories NTT Corporation 3-9-11 Midori-cho Musashino-shi Tokyo 180-8585 Japan

ISBN: (纸本)9781624100932

The Internet has become a global medium for communication, entertainment, and e-commerce. And there is increasing demand to deliver multimedia contents, such as audio and video data, from web sites to many customers simultaneously. The size of data to be delivered and the number of transmission points has been increasing recently. In this context satellite communication is thought to be effective network and communication infrastructure because it covers large area and easily provides high-speed service with great many reception points. A direct-multicasting satellite communications system was previously proposed to achieve a full mesh type satellite network economically and we developed the group modem, the efficient channel assignment control program, and the highly reliable multicasting program for it. This paper presents the architecture of the group modem that is used for direct-multicasting satellite communications system as a key technology of it. © 2003 by the American Institute of Aeronautics and Astronautics, Inc. all rights reserved.

关键词： Satellite communication systems

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Guaranteed service level agreements across multiple ISP networks 4

Guaranteed service level agreements across multiple ISP netw...

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4th International Workshop on Design of Reliable communication networks (DRCN 2003)

作者： Pongpaibool, P Kim, HS Carnegie Mellon Univ Pittsburgh PA 15213 USA

ISBN: (纸本)0780381181

Due to the autonomous nature of ISPs, the service level agreement (SLA) offering is currently confined to within a single provider network. In this work, we examine some methods of extending the SLA offering across ISP boundaries. We introduce three policies to coordinate the end-to-end performance guarantee in multiple ISP networks: the least-effort, the most-effort, and the equal-distribution policies. These policies refer to different manners in which the service-level constraints are distributed among all transit networks. We study the impacts of these policies on the overall ISP community when SLA is required. We evaluate the effectiveness of these policies in terms of both the network performance and the ISP's monetary profit. The results show that the policy choice depends on the network load, as well as the ISP cost structure.

关键词： service level agreement provisioning protection IP over WDM network

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A message delivery mechanism for HAVi network

A message delivery mechanism for HAVi network

引用

Proceedings of the Seventh IASTED International conference on Internet and Multimedia systems and Applications

作者： Hsu, Kuo-Wei Chen, Chuen-Liang Li, Wu-Cheng Yu, Ting-Ying Department of Computer Science National Taiwan University No.1 Roosevelt Rd. Sec. 4 Taipei 106 Taiwan

ISBN: (纸本)0889863806

In HAVi, all software elements communicate with one another using the HAVi RMI (Remote Method Invocation), which is based on the request and response message exchanges among HAVi Messaging systems. Messaging System is the main building block of HAVi middleware. In this paper, we propose an approach to implement the HAVi message delivery mechanism. We discuss the design issues and implementation details of the binding between messages and the code that handles them. We adopt Java to implement the proposed architecture since it can increase the portability and reduce the development costs.

关键词： Voice/data communication systems

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Design of an efficient CAC for a broadband DVB-S/DVB-RCS satellite access network

Design of an efficient CAC for a broadband DVB-S/DVB-RCS sat...

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

作者： Inzerilli, Tiziano Montozzi, Simone Univ. di Roma La Sapienza DIS Via Salaria 113 00198 Rome Italy

This paper deals with efficient utilization of network resources in an advanced broadband satellite access system. It proposes a technique for admission control of IP streams with guaranteed QoS which does not interfere with the particular BoD (Bandwidth on Demand) algorithm that handles access to uplink bandwidth, an essential part of a DVBRCS architecture. This feature of the admission control greatly simplify its integration in the satellite network. The purpose of this admission control algorithm in particular is to suitably and dynamically configure the overall traffic control parameters, in the access terminal of the user and service segment, with a simple approach which does not introduces limitations and/or constraints to the BoD algorithm. Performance of the proposed algorithm is evaluated thorugh Opnet simulations using an ad-hoc platform modeling DVB-based satellite access. The results presented in this paper were obtained within SATIP6 project, which is sponsored within the 5th EU Research Programme, IST. The aims of the project are to evaluate and demonstrate key issues of the integration of satellite-based access networks into the Internet in order to support multimedia services over wide areas. The satellite link layer is based on DVB-S on the forward link and DVB-RCS on the return link. Adaptation and optimization of the DVB-RCS access standard in order to support QoS provision are central issues of the project. They are handled through an integration of Connection Admission control (CAC), Traffic Shaping and Policing techniques.

关键词： Satellite communication systems

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Efficient Embedding of Virtual Hypercubes in Irregular WDM optical networks

Efficient Embedding of Virtual Hypercubes in Irregular WDM O...

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作者： Kithlanagamangala, Guru Prasad P. Louisiana State University and Agricultural and Mechanical College

学位级别：硕士

This thesis addresses one of the important issues in designing future WDM optical networks. Such networks are expected to employ an all-optical control plane for dissemination of network state information. It has recently been suggested that an efficient control plane will require non-blocking communication infrastructure and routing techniques. However, the irregular nature of most WDM networks does not lend itself to efficient non-blocking communications. It has been recently shown that hypercubes offer some very efficient non-blocking solutions for, all-to-all broadcast operations, which would be very attractive for control plane implementation. Such results can be utilized by embedding virtual structures in the physical network and doing the routing using properties of a virtual architecture. We will emphasize the hypercube due to its proven usefulness. In this thesis we propose three efficient heuristic methods for embedding a virtual hypercube in an irregular host network such that each node in the host network is either a hypercube node or a neighbor of a hypercube node. The latter will be called a "satellite" or "secondary" node. These schemes follow a step-by-step procedure for the embedding and for finding the physical path implementation of the virtual links while attempting to optimize certain metrics such as the number of wavelengths on each link and the average length of virtual link mappings. We have designed software that takes the adjacency list of an irregular topology as input and provides the adjacency list of a hypercube embedded in the original network. We executed this software on a number of irregular networks with different connectivities and compared the behavior of each of the three algorithms. The algorithms are compared with respect to their performance in trying to optimize several metrics. We also compare our algorithms to an already existing algorithm in the literature.

关键词： network state information exchange hypercubes control plane embedding routing

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