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检索条件"任意字段=Conference on Internet Performance and Control of Network Systems II"

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Characterization and performance evaluation for proportional delay differentiated services

Characterization and performance evaluation for proportional...

引用

International conference on network Protocols

作者： M.K.H. Leung J.C. Lui D.K.Y. Yau Department of Computer Science & Engineering Chinese University of Hong Kong Sha Tin Hong Kong China Department of Computer Science Purdue University West Lafayette IN USA

We consider a proportional delay model for internet differentiated services. Under this model, an ISP can control the "spacing" of waiting times between different classes of traffic. Specifically, the ISP tries to ensure that the average waiting time of class i traffic relative to that of class i-1 traffic is consistently a specifiable ratio. If the ratio is less than one, the ISP can legitimately charge users of class i traffic a higher tariff rate (compared to the rate for class i-1 traffic), since class i users consistently enjoy better performance than class i-1 users. We use time-dependent priority scheduling to realize the proportional delay model. We formally characterize the feasible regions in which given delay ratios can be achieved. Moreover a set of scheduling parameters for obtaining the desired delay ratios can be determined by an efficient control algorithm. Experiments are carried out to illustrate the short-term, medium-term and long-term relative waiting time performances for different service classes.

关键词： Delay Web and internet services Traffic control Telecommunication traffic Computer science Scheduling algorithm Software performance Games Application software Adaptive systems

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Adaptive video distribution using IP multicast

Adaptive video distribution using IP multicast

引用

IEEE International conference on networks

作者： Ng Yew Meng A.K. Gupta School Of Computer Engineering Nanyang Technological University Singapore

ISBN: (纸本)0769507778

Multicast is a common method for distributing real-time audio and video over the internet. The Receiver-driven Layered Multicast (RLM) is one of the most popular receiver-based rate adaptation algorithms. However, RLM is relatively slow in adapting changes in the bandwidth of the network. Its adaptive control is based on packet loss rate. A number of extensions and variants of RLM have been proposed in the literature to improve some of these weaknesses. However, the responses of the receivers are improved at the expense of protocol complexity. In this paper, a receiver-based adaptive multimedia system using the RLM protocol for rate control is implemented. The RLM algorithm is modified to minimise congestion in the network and to reduce the processing overhead. We have also investigated whether the interframe jitter is an appropriate measure of the network congestion, and how it can be used to decide whether a receiver can subscribe to a higher layer at a given point of time. A heuristic method is used to determine the interframe jitter values that the system can tolerate. The modified RLM algorithm is also integrated with the encoding and decoding of the MPEG video to evaluate the overall performance. The preliminary results demonstrate that rate control using the inter-frame jitter has better video quality than that using packet loss rate.

关键词： Jitter Adaptive control Protocols internet Multicast algorithms Bandwidth Adaptive systems Programmable control Multimedia systems control systems

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A synchronization and flow control scheme for interactive multimedia-on demand (MOD) systems

A synchronization and flow control scheme for interactive mu...

引用

International conference on Parallel and Distributed systems (ICPADS)

作者： Chung-Ming Huang Chian Wang Hsu-Yang Kung Institute of Information Engineering National Cheng Kung University Tainan Taiwan

Synchronization control with VCR-like user interactions in the multi-stream environment is very complicated and difficult. The main reasons are that: (i) those media units stored in the client buffers and flowing in the networks may be either useful or useless when the user interaction is issued, and (ii) the servers' media transmission should be adjusted according to the presentation status of the client. Additionally, different VCR-like user interactions have their own processing considerations, which result in different control schemes for different VCR-like user interactions. We propose some control schemes to handle interactive multimedia communication in the distributed multi-stream environment and develop an MOD system on SUN SPARC workstations accordingly.

关键词： control systems Streaming media Buffer storage Multimedia systems Graphics Communication channels internet Sun Workstations network servers

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Guaranteeing multiple QoSs in differentiated services internet

Guaranteeing multiple QoSs in differentiated services Intern...

引用

International conference on Parallel and Distributed systems (ICPADS)

作者： Hoon Lee Hyejin Kwon Y. Nemoto Telecommunications Network Laboratory Korea Telecom Daejeon South Korea Graduate School of Information Sciences University of Tohoku Sendai Japan

In this paper, we propose a new architecture for guaranteeing the multiple Quality of Services (QoSs) in Differentiated Service internet. We take into account the IETF's Differentiated Service (DiffServ) architecture as well as the QoS requirements of each user application. The main focus lies in the modeling and performance evaluation of the prioritized packet service scheme in the core router which supports weighted priority services in the packet with three service classes defined in IETF: EF (Expedited forwarding), AF (Assured forwarding) and DF (Default forwarding) PHB (Per Hop Behavior). Via simulation experiments we discuss the implication of the proposed scheme.

关键词： Web and internet services Traffic control Quality of service Telecommunication traffic Diffserv networks Intelligent networks Electronic mail Focusing IP networks Throughput

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Simulation comparison of RED and REM

Simulation comparison of RED and REM

引用

IEEE International conference on networks

作者： S. Athuraliya S. Low Department of EEE University of Melbourne Australia

We proposed earlier (Athuraliya et al. 2000) an optimization based flow control for the internet called random exponential marking (REM). REM consists of a link algorithm, that probabilistically marks packets inside the network, and a source algorithm, that adapts source rate to observed marking. The marking probability is exponential in a link congestion measure, so that the end-to-end marking probability is exponential in a path congestion measure. Because of the finer measure of congestion provided by REM, sources do not constantly probe the network for spare capacity, but settle around a globally optimal equilibrium, thus avoiding the perpetual cycle of sinking into and recovering from congestion. In this paper we compare the performance of REM with Reno over RED (random early detection) through simulation.

关键词： internet control systems Design optimization Probes Constraint optimization Cost accounting Aggregates Communication system control Distributed computing Feedback

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Modeling and simulation of the VDL mode 3 subnetwork in the ATN environment

Modeling and simulation of the VDL mode 3 subnetwork in the ...

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conference on Digital Avionics systems (DASC)

作者： B. Hung Yoon Hong MITRE Corporation McLean VA USA

This paper presents the modeling and simulation results of an international aeronautical mobile communications system operating within the environment of an international civil aviation internet. The ground-based aeronautical mobile communications system uses a network of ground stations to provide the desired airspace coverage utilizing the Very High Frequency (VHF) band (118-137 MHz) allocated for aviation and a Time Division Multiple Access (TDMA) technique to control media access between aircraft and ground stations. Major performance parameters of interest are: transit end-to-end delays; overall connection establishment times; and protocol overheads resulting from the use of various upper layer protocol data units.

关键词： Mobile communication Satellite ground stations Time division multiple access Access protocols internet Radio spectrum management Frequency conversion Communication system control control systems Aircraft

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An enhanced random early marking algorithm for internet flow control

An enhanced random early marking algorithm for Internet flow...

引用

IEEE Annual Joint conference: INFOCOM, IEEE Computer and Communications Societies

作者： S. Athuraliya D. Lapsley S. Low Department of EEE University of Melbourne Australia

We propose an optimization based flow control for the internet called random early marking (REM). In this paper we propose and evaluate an enhancement that attempts to speed up the convergence of REM in the face of large feedback delays. REM can be regarded as an implementation of an optimization algorithm in a distributed network. The basic idea is to treat the optimization algorithm as a discrete time system and apply linear control techniques to stabilize its transient. We show that the modified algorithm is stable globally and converges exponentially locally. This algorithm translates into an enhanced REM scheme and we illustrate the performance improvement through simulation.

关键词： internet Feedback Convergence Delay control systems Communication system control Aggregates Design optimization Australia Projection algorithms

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performance analysis of storage and network subsystems in cluster architectures

Performance analysis of storage and network subsystems in cl...

引用

IEEE International conference on Cluster Computing

作者： R. Cristaldi G. Iannello Dipartimento di Informatica e Sistemistica Universith di Napoli Federico II Naples Italy

Single System Image is a desirable property for all services provided by a cluster environment. Coherently with this principle, cluster file systems should make data distribution transparent to the application, giving rise to a heavy communication workload induced by I/O activity. Hence, I/O performance greatly depends on communication performance and on how the storage and network subsystems interact at all levels. The authors present a detailed performance analysis of the storage and network subsystems of a properly configured cluster node. In particular, we consider the case of an Ultra2 SCSI controller with multiple attached disks sharing the I/O bus with a Gigabit LAN adapter. The analysis helps to understand how the several hardware and software components interact, which are the potential bottlenecks, and how these bottlenecks affect the overall performance.

关键词： performance analysis Intelligent networks File systems Hardware Bandwidth Throughput network servers Software performance Communication system control Local area networks

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Efficient translation of network performance parameters for transport of IP packets over cell-switched subnetworks

Efficient translation of network performance parameters for ...

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European conference on Universal Multiservice networks (ECUMN)

作者： J. Schmitt M. Karsten R. Steinmetz Industrial Process and System Communications Darmstadt University of Technology Germany GMD IPSI German National Research Center for Information Technology (GMD) Darmstadt Germany

We deal with mapping performance-oriented IP services such as Integrated Services (IntServ) or Differentiated Services (DiffServ) onto network performance parameters for cell-switched transport networks, as for example ATM. The impact of translating IP performance parameters into ATM network services is analyzed and the detrimental effects of careless mappings are illustrated. Then, approaches to circumvent these detrimental effects are presented.

关键词： Quality of service Asynchronous transfer mode Bit rate Standardization IP networks Intserv networks Diffserv networks Web and internet services Large-scale systems Shape control

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Differentiated predictive fair service for TCP flows

Differentiated predictive fair service for TCP flows

引用

International conference on network Protocols

作者： I. Matta Liang Guo Computer Science Department Boston University Boston MA USA

The majority of the traffic (bytes) flowing over the internet today have been attributed to the Transmission control Protocol (TCP). This strong presence of TCP has spurred further investigations into its congestion control mechanism and its effect on the performance of short and long data transfers. We investigate the interaction among short and long TCP flows, and how TCP service can be improved by employing a low-cost service differentiation scheme. Through control-theoretic arguments and extensive simulations, we show the utility, of isolating TCP flows into two classes based on their life-time/size, time/size one class of short flows and another of long flows. With such class-based isolation, short and long TCP flows have separate service queues at routers. This protects each class of flows from the other as they possess different characteristics, such as burstiness of arrivals/departures and congestion/sending window dynamics. We show the benefits of isolation, in terms of better predictability and fairness, over traditional shared queueing systems with both tail-drop and random-early-drop (RED) packet dropping policies.

关键词： Traffic control Web and internet services Diffserv networks Proposals Computer science Protocols Size control Protection Engineering profession Telecommunication traffic

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