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Joint conference of the 4th International conference on Information, Communications and Signal Processing/4th Pacific-Rim conference on Multimedia (ICICS-PCM 2003)

作者： Wong, TC Mark, JW Chua, KC Chew, YH Agcy Sci Technol & Res Inst Infocomm Res Singapore 117674 Singapore

ISBN: (纸本)0780381858

An approximate performance analysis of a leaky bucket with Pareto-distributed On/Off sources is presented. The aggregate of Pareto-distributed On/Off sources is a self-similar traffic. This analysis is applicable to the leaky bucket policing device at the ingresses of (1) a base station in a Wireless ATM network, (2) a wireline ATM network, and (3) future generations of ip-based networks with quality of service (QoS) differentiation and with call admission control. The performance metric is packet loss: Numerical results show good agreement between the approximate analysis and simulation results.

关键词： usage parameter control policing device leaky bucket Pareto distribution self-similar traffic performance evaluation wireless and wireline networks

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International conference on Information Networking, ICOIN 2003

International Conference on Information Networking, ICOIN 20...

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International conference on Information Networking, ICOIN 2003

ISBN: (纸本)3540408274

The proceedings contain 107 papers. The special focus in this conference is on High-Speed Network Technologies, Enhanced Protocols in Internet, QOS in Internet and Mobile Internet. The topics include: A comparative analysis of scheduling algorithms;design of load-adaptive queue management for internet congestion control;performance analysis of an ip lookup algorithm for high speed router systems;a high speed ATM/ip switch fabric using distributed scheduler;an approach to improve efficiency of WDM optical burst switching networks;performance analysis of degree four topologies for the optical core of ip-over-WDM networks;analysis of end-to-end recovery algorithms with preemptive priority in GMPLS networks;an efficient restoration scheme using protection domain for dynamic traffic demands in WDM networks;periodic communication support in multiple access networks exploiting token with timer;an adaptive contention period control in HFC networks;an extension of scalable global ip any casting for load balancing in the internet;energy-efficient communication protocols for wireless networks;router-assisted TCP-friendly traffic control for layered multicast;the stability problem of multicast trees in layered multicast;FUMRP protocol for reliable multicasting in wireless ad-hoc network environments;an MPLS broadcast mechanism and its extension for dense-mode multicast support;error recovery algorithm for multimedia stream in the tree-based multicast environments;shortest-path mailing service using active technology;robust audio streaming over lossy packet-switched networks;personal server model for real-space networking and CORBA extensions to support QoS-aware distributed systems.

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Neural Network Middleware for Model Predictive Path Tracking of Networked Mobile Robot over ip Network

Neural Network Middleware for Model Predictive Path Tracking...

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The 29th Annual conference of the IEEE Industrial Electronics Society

作者： Tipsuwan, Yodyium Chow, Mo-Yuen Department of Electrical Engineering North Carolina State University Raleigh NC 27606 United States

The potential use of ip networks for real-time high performance robots and automation is enormous and appealing. A widely attractive objective for an ip-based mobile robot is to control a mobile robot over the ip network to track a predefined path. This paper proposes a model predictive path tracking control methodology over an ip network via middleware. In addition to the normal use of middleware, this paper utilizes middleware to schedule a control parameter for ip network delay compensation. The parameter is adjusted externally at the output of the path tracking algorithm with respect to the current network traffic conditions and a predictive performance measure computed by a neural network. Simulation results show that the mobile robot with neural network middleware provides significantly better ip networked control system performance.

关键词： Mobile robots

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The performance of QoS-aware ip multicast routing protocols

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networks 2003年第2期42卷 97-108页

作者： Tseng, CJ Chen, CH Natl Taiwan Univ Sci & Technol Dept Elect Engn Multimedia Network Lab Taipei Taiwan

Research in the area of QoS-aware dynamic multicast routing protocols has been very active in recent years. Protocols based on dynamic Steiner tree strategies, such as YAM and QoSMIC, have been consistently shown to outperform those based on shortest path heuristics, such as PIM and DVMRP. However, these protocols all suffer from the problem of poor scalability for one or more of the following reasons: high control overhead, insufficient robustness with the adoption of a centralized group manager, and excessively long join latency. In addition, these protocols perform well only when group members are either densely populated or sparsely populated, but, unfortunately, not both. In this paper, we propose a protocol, named DSDMR, which can adapt its strategy based on sensed group member densities. Underlying DSDMR is an adaptive two-direction join mechanism that tries to find good attaching points for new group members either from the source or from the new joining member depending on member densities. We evaluate our scheme using extensive simulations and found that DSDMR can build multicast trees with costs close to the best greedy strategy, very low control overhead, and very short join latency across a wide member density spectrum. Furthermore, its success ratio is only slightly lower than is the best greedy strategy in finding feasible routes subject to both bandwidth and end-to-end delay constraints. (C) 2003 Wiley Periodicals, Inc.

关键词： multicast dynamic routing dynamic Steiner tree QoS routing density sensitive

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Voice performance in WLAN networks - An experimental study

Voice performance in WLAN networks - An experimental study

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IEEE Global Telecommunications conference (GLOBECOM 03)

作者： Anjum, F Elaoud, M Famolari, D Ghosh, A Vaidyanathan, R Dutta, A Agrawal, P Kodama, T Katsube, Y Telcordia Technol Morristown NJ 07960 USA

ISBN: (纸本)0780379748

In this work, we measure Wireless Local Area Network (WLAN) voice performance and capacity. While most WLAN applications today are data centric, the growing popularity of Voice over ip (Voip) applications and the escalating trend towards convergence with cellular networks will catalyze an increased mix of voice traffic. Since voice applications must compete with each other and with simultaneous data applications for WLAN bandwidth, quantifying voice performance and capacity in the presence of background data traffic is an important issue. We offer a practical investigation into the ability of 802.11b MAC layer to support simultaneous voice and data. We quantify Voip capacity for standard WLAN networks, indicative of those already in the field, as well as evaluate the practical benefits of implementing backoff control and priority queuing at the access point. Conclusions are drawn based on an extensive set of real-world measurements conducted using off-the-shelf equipment in a commercial testbed.

关键词： Wireless telecommunication systems

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Research of differentiated QoS routing in GMPLS-based ip/WDM networks

Research of differentiated QoS routing in GMPLS-based IP/WDM...

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Asia-Pacific Optical and Wireless Communications conference (APOC 2003)

作者： Wang, YY Zeng, QJ Cao, JW Shanghai Jiao Tong Univ Ctr Broadband Opt Networking Technol Shanghai 200030 Peoples R China

ISBN: (纸本)0819451770

At this point in technology's evolution, the simplicity, elegance, extensibility, and broad compatibility of the Internet protocol suite has made it the automatic choice for most forms of communication. The attempts at resolution of this apparent dichotomy consist of a collection of technologies and philosophies known as Quality of Service. In an ip network, QoS defines the ability to compensate for traffic characteristics without compromising average throughput. Clearly, optimizing QoS performance for all traffic types on an ip network presents a daunting challenge. To partially address this challenge, several Internet Engineering Task Force groups have been working on standardized approaches for ip-based QoS technologies. The IETFs approaches fall into four categories: prioritization using differentiated services, reservation using integrated services, label switching using multi-protocol label switching, bandwidth management using the subnet bandwidth manager. Differentiated services classify per-hop behaviors on the basis of a Diffserv code point attached to the type of service byte in each packet's ip header. This DSCP approach represents a form of soft QoS that rather coarsely classifies services through packet marking. The differentiated QoS routing in GMPLS-based ip/WDM networks are a promising candidate for the next generation optical Internet networks. By using a unified control plane, such networks make more efficient usage of network resources both at the ip layer and the WDM optical layer. In this paper, we consider prioritized routing of bandwidth-guaranteed Label Switched paths (LSPs) providing service differentiation between classes of high and normal priority traffic. The QoS delay requirements are assumed to be translated into bandwidth and O-E-O conversion requirements. We present a graphical representation of the integrated network state which is different from other conventional graphical representations in that it models the cost of usage of po

关键词： QoS GMPLS WDM DSCP diffserv

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Perceptual video quality management system for streaming media distribution 9

Perceptual video quality management system for streaming med...

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9th Asia-Pacific conference on Communications held in conjunction with the 6th Malaysia International conference on Communications (MICC 2003)

作者： Nagafuchi, Y Yanagimoto, K Takagi, N Kuribayashi, S NTT Corp NTT Informat Sharing Platform Labs Musashino Tokyo 1808585 Japan

ISBN: (纸本)0780381149

With the growth of high-speed access networks and popularity of high-performance computers, we can enjoy video streaming services (both live streaming and video-on-demand) via the,Internet at-home. For higher perceptual video quality, it is necessary to monitor the video quality of each user flow in real time and control network resource based on it. In this paper we propose a streaming quality management (SQM) system that estimates perceptual video quality of each user flow by capturing control messages of streaming protocol between server and client at server side. In addition, we equipped SQM system for Windows Media Technologies (WMT), Real System, and Mpeg2. The equipped SQM system has desirable characteristics;estimated streaming quality obtained from this system is almost the same as that from DMOS (Degradation Mean Opinion Score) defined by ITU-T [1] and the system has high scalability. Furthermore, we present network control schemes based on the. streaming quality, and propose value-added services (ex. which part of the content was viewed the most or how many times the content was viewed) using the streaming monitoring record of each user, which could be collected by the SQM system.

关键词： control systems Degradation ip networks Monitoring Network servers Protocols Quality management scalability Streaming media Web and internet services

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6th IFip/IEEE International conference on Management of Multimedia networks and Services, MMNS 2003

6th IFIP/IEEE International Conference on Management of Mult...

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6th IFip/IEEE International conference on Management of Multimedia networks and Services, MMNS 2003

ISBN: (纸本)3540200509

The proceedings contain 40 papers. The special focus in this conference is on Management of Multimedia networks and Services. The topics include: CORBA-based stream control and management for ip-based production studio networks;ip video streaming with fine-grained TCP-friendly rate adaptation;dynamic configuration of multimedia applications;a multicast management solution for access control and traffic filtering;a heuristic algorithm for the multi-constrained multicast tree;TCP friendly rate adaptation for multimedia streaming in mobile ad hoc networks;a tool to generate multimedia monitoring applications for wireless sensor networks;managing services quality through admission control and active monitoring;pervasive accounting of resource consumption for wireless services with adaptive QoS;mobility model for multimedia mobile radio network;a novel DCA scheme for resource sharing in cellular environments with heterogeneous traffic;a new bandwidth guaranteed routing approach for online calculation of LSPs for MPLS traffic engineering;new management methods for feature and preference interactions;providing enhanced differentiated services for real-time traffic in the internet;achieving relative differentiated services using proportional probabilistic priority scheduling on network processor;administrative policies to regulate quality of service management in distributed multimedia applications;predicting violations of QoS requirements in distributed systems;secure inclusion of phones into online e-meetings;on using multi agent systems in end to end adaptive monitoring and a new available bandwidth measurement technique for service overlay networks.

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Development of QoS signaling protocols in the Internet 28

Development of QoS signaling protocols in the Internet

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28th Annual IEEE International conference on Local Computer networks held in conjunction with Workshop on High-Speed Local networks/Workshop on Wireless Local networks

作者： Fu, XM Univ Gottingen Inst Informat D-3400 Gottingen Germany

ISBN: (纸本)0769520375

QoS signaling protocol is one of the key components in Internet QoS architectures to establish, maintain, and remove reservation states in network nodes. This paper gives an overview of the recent efforts underway on next steps in QoS signaling protocols, namely RSVP extensions with mobility support, QoS-conditionalized handoff protocol, the layered architecture RSVP Lite and the Cross-Application Signaling Protocol (CASP). These efforts address main issues with existing approaches differently : modularity, complexity and mobility support, with a focus on protocol behaviors based on different design principles. The paper also provides pointers to standards effort towards general Internet signaling and other service-specific signaling protocols.

关键词： Chromium Informatics Intelligent networks ip networks Signal design Signal processing traffic control Transport protocols Web and internet services Wireless application protocol

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PURPLE: Predictive active queue management utilizing congestion information 28

PURPLE: Predictive active queue management utilizing congest...

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28th Annual IEEE International conference on Local Computer networks held in conjunction with Workshop on High-Speed Local networks/Workshop on Wireless Local networks

作者： Pletka, R Waldvogel, M Mannal, S IBM Res Corp Zurich Res Lab Zurich Switzerland

ISBN: (纸本)0769520375

Active Queue Management (AQM) is an attempt to find a delicate balance between two antagonistic Internet queuing requirements: First, buffer space should be maximized to accommodate the possibly huge transient bursts;second, buffer occupation should be minimum so as not to introduce unnecessary end-to-end delays. Traditional AQM mechanisms have been built on heuristics to achieve this balance, and have mostly done so quite well, but often require manual tuning or have resulted in slow convergence. In contrast, the PURPLE approach predicts the impact of its own actions on the behavior of reactive protocols and thus on the short-term future traffic without keeping per-flow state. PURPLE allows much faster convergence of the main AQM parameters, at least towards a local optimum, thereby smoothing and minimizing both congestion feedback and queue occupancy. To improve the quality of the prediction, we also passively monitor (using lightweight operations) information pertaining to the amount of congestion elsewhere in the network, for example, as seen by flows traversing this router.

关键词： Computer network management Convergence Delay estimation Information management Internet ip networks Laboratories Propagation losses traffic control Transport protocols

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