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Cooperation of multiple simulators for mobile IP networks 17

Cooperation of multiple simulators for mobile IP networks

引用

17th International conference on Advanced Information networking and Applications

作者： Onoe, Y Atsumi, Y Sato, F Mizuno, T NTT Corp DoCoMo Multimedia Labs Yokosuka Kanagawa 2398536 Japan

ISBN: (纸本)0769519067

In the field of mobile communication, not only has the scale of network environments increased over the last few years, but there has also been a steady increase in the diversity of mobile communication protocols and service applications due to the spread of mobile Internet applications. To enable these networks to he designed and developed efficiently, it is therefore necessary to have some way of simulating entire systems in order to evaluate different schemes, predict the traffic levels and try out alternative designs. In this study, we simulate a large-scale wide-area mobile Internet environment by allowing multiple existing simulators to cooperate with each other. Specifically, by calling wireless data link protocol software simulator on an OPNET from an ns-2 simulator running a wide-area network simulation, we have conducted a simulated evaluation of a TCP/IP communication protocol suite including a W-CDMA environment, thereby confirming the validity of this approach.

关键词： Mobile communication mobile computing simulation TCP/IP mobile IP

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Multifractal analysis and model of the MPEG-4 video traffic

Multifractal analysis and model of the MPEG-4 video traffic

引用

IEEE International Performance, computing and Communications conference

作者： Hong, F Wu, ZM Chinese Acad Sci Inst Software Multimedia & Network Res Ctr Beijing 100080 Peoples R China

ISBN: (纸本)0780378938

MPEG-4 encoded video is expected to account for a large portion of the traffic in future wireline and wireless networks. But there are only few studies that evaluate networking protocols and resource management schemes with such new object-based encoded video. In this paper, we explore the viability of multifractal analysis in modeling the MPEG-4 video traffic. First, we prove that the MPEG-4 video traffic exhibit the multifractal characteristic through multifractal formalism and spectra analysis. Then we apply the multifractal wavelet model to the MPEG-4 video traffic analysis and synthesis. This model uses the Haar wavelet transform and puts a constraint on the wavelet coefficients to guarantee positivity, which results in a swift O(N) algorithm to synthesize N-point data sets. The statistical numeric results and fit procedure show this model's flexibility and accuracy in the MPEG-4 video modelling.

关键词： telecommunication traffic fractals spectral analysis visual communication protocols resource allocation wavelet transforms Haar transforms video coding statistical analysis MPEG-4 video traffic multifractal analysis encoded video networking protocols resource management multifractal characteristics multifractal formalism spectral analysis wavelet transform Haar transform statistical analysis multifractal wavelet model

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Towards an architecture for audio/video conferencing in distributed brokering systems

Towards an architecture for audio/video conferencing in dist...

引用

3rd International conference on Communications in computing

作者： Uyar, A Pallickara, S Fox, G Syracuse Univ Syracuse NY 13244 USA

ISBN: (纸本)1932415068

In this paper, we explore the deployment of distributed brokering systems in the context of audio/video conferencing. We expand upon our earlier work in this area, and eliminate certain drawbacks that were present in that approach. Our new work provides substantial performance improvements. Also, we outline our support for managing legacy applications within the system. We based our investigations on the NaradaBrokering system, which provides support for peer-to-peer (P2P), centralized and distributed interactions. We include experimental results, from our performance tests, which substantiate our claim that systems such as NaradaBrokering can be deployed in the context of real-time audio/video conferencing, while supporting large heterogeneous client configurations.

关键词： Audio/video conferencing Distributed messaging multimedia systems Publish/subscribe systems

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Developing a distributed stock exchange application using CORBA

Developing a distributed stock exchange application using CO...

引用

Student conference on Research and Development, SCOReD 2003

作者： Taibi, Toufik Ping, Lim Boon Wen, Ng Sheau Sing, Lai Kiat Lim, Chew Keow Faculty of Information Technology Multimedia University Jalan Multimedia Cyberjaya Selangor63100 Malaysia

ISBN: (纸本)0780381734

Distributed computing has emerged as a promising solution to the inherent drawbacks of monolithic (stand-alone) computing. Common Object Request Broker Architecture (CORBA) has become a de facto in developing distributed applications due to its standardized architecture, and easy interoperability among distributed components managed by an Object Request Broker (ORB). This paper describes how CORBA standard was successfully used in developing a distributed stock exchange application, a trpical three tiers (clients, brokers, stock exchange) application that has many distributed components and a high database hit rate. The Kuala Lumpur Stock Exchange (KLSE) was taken as a model of study in developing this appIication. CORBA event service was heavily used to cater for the communication needs of this application. Unified Modeling Language (UML) was used to develop the analysis and design deliverables of the application while VisBroker and Java were respectively the ORB and programming language used to implement the Interface Definition Language (IDL) files developed. © 2003 IEEE.

关键词： Middleware

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Wireless network interface energy consumption - Implications for popular streaming formats

Wireless network interface energy consumption - Implications...

引用

conference on multimedia computing and networking 2002

作者： Chandra, S Univ Notre Dame Dept Comp Sci & Engn Notre Dame IN 46556 USA

With the proliferation of mobile streaming multimedia, available battery capacity constrains the end-user experience. Since streaming applications are expected to be long running, wireless network interface card's (WNIC) energy consumption is particularly an acute problem. In this work, we explore various mechanisms to conserve client WNIC energy consumption for popular streaming formats such as Microsoft Windows media, Real and Apple Quicktime. First, we investigate the WNIC energy consumption characteristics for these popular multimedia streaming formats under varying stream bandwidth and network loss rates. We show that even for a high bandwidth 2000 kbps stream, the WNIC unnecessarily spent over 56% of the time in idle state;illustrating the potential for significant energy savings. Based on these observations, we explore two mechanisms to conserve the client WNIC energy consumption. First we show the limitations of IEEE 802.11 power saving mode for multimedia streams. Without an understanding of the stream requirements, these scheduled rendezvous mechanisms do not offer any energy savings for multimedia streams over 56 kbps. We also develop history-based client-side strategies to reduce the energy consumed by transitioning the WNICs to a lower power consuming sleep state. We show that streams optimized for 28.8 kbps can save over 80% in energy consumption with 2% data loss. A high bandwidth stream (768 kbps) can still save 57% in energy consumption with less than 0.3% data loss. We also show that Real and Quicktime packets are harder to predict at the network level without understanding the packet semantics. As the amount of cross traffic generated by other clients that share the same wireless segment increases, the potential energy savings from our client side policies deteriorate further. Our work enables multimedia proxy and server developers to suitably customize the stream to lower client energy consumption.

关键词： multimedia systems

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Autonomous content-location binding system through wireless ad-hoc communication

Autonomous content-location binding system through wireless ...

引用

Proceedings of the Seventh IASTED International conference on Internet and multimedia Systems and Applications

作者： Ishida, Takaaki Hisamatsu, Shinichi Nakamura, Osamu Murai, Jun Grad. School of Media and Governance Keio University 5322 Endo Fujisawa Kanagawa Japan Fac. of Environmental Information Keio University 5322 Endo Fujisawa Kanagawa Japan

ISBN: (纸本)0889863806

Advancement in wireless networking and mobile computing technology has brought new needs to communicate with not only the particular person but general public who are in specified area in real space. Geographically dependent contents such as advertisement to a specific region and traffic information are suitable for this communication. If these contents is bound to suitable time and place, the value of contents become higher for both of senders and receivers. The goal of our research is to realize a new content distribution model where contents will be gathered only in to specific area autonomously without centralized management but cooperation of mobile nodes. The use of this model will bring users a freedom to send or leave contents about specific location and time, as well as giving users a chance to receive all the information bound to their location. In this paper, we present the design of simple but robust model to exchange information between nodes in certain location called, "Content Cruising System"(CCS), which is implemented in original simulator. CCS uses P2P communication model to distribute contents. Therefore, CCS will provide robust communication in wireless adhoc network. Presented results show the simulation results with assumed movement patterns of people in real space wireless communication in several situations.

关键词： multimedia systems

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Proceedings - International conference on Advanced Information networking and Applications, AINA

Proceedings - International Conference on Advanced Informati...

引用

17th International conference on Advanced Information networking and Applications, AINA 2003

ISBN: (纸本)0769519067

The proceedings contain 155 papers. The topics discussed include: recent advances in mobile computing and communication;a dual-channel location estimation system for providing location services based on the GPS and GSM networks;compression-based broadcast strategies in wireless information systems;deployment of a DiffServ-based priority service in a MAN/WAN environment;run time adaptation of UMTS services to available resources;adaptive user interface for multimedia communication system based on multiagent;flexible group communication protocol for distributed systems;asynchronous media casting network: an optimal network scheme for on-demand video distribution;design and implementation of knowledge-based videoconference system;design and implementation of a p2p shared web browser using JXTA;a remote experiment system provided with individual guidance function and report preparation support function;analysis of delayed reservation scheme in server-based QoS management network;wide area disaster information network and its resource management system;and feedback and analysis from assessment metadata in e-learning.

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An adaptive energy-efficient link layer protocol using stochastic learning control

An adaptive energy-efficient link layer protocol using stoch...

引用

IEEE International conference on Communications (ICC)

作者： Kiran, S Chandramouli, R Stevens Inst Technol Dept Elect & Comp Engn Multimedia Syst Networking & Commun MSyNC Lab Hoboken NJ 07030 USA

ISBN: (纸本)0780378024

We present a computationally simple stochastic learning control framework for an adaptive energy efficient link layer protocol. A stochastic iterative technique is discussed that can produce soft channel state predictions and track slow/rapidly varying bursty, finite state wireless channels. No a priori knowledge about the state transition probabilities is needed for this. Theoretical convergence of the proposed technique is shown. The proposed link layer protocol utilizes the channel state predictions from the stochastic learning algorithm while computing energy efficient transmission policies. This entire process is performed on-line with no pilot (training) symbols, etc., thereby improving the throughput and avoiding energy wastage due to pilot symbols. Simulation results show that up to 50% energy savings can be obtained for some channels when compared with a popular link layer protocol. Energy and delay can be traded-off efficiently using the proposed method.

关键词： Network protocols

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Multifractal analysis and model of the MPEG-4 video traffic

Multifractal analysis and model of the MPEG-4 video traffic

引用

22nd IEEE International Performance, computing, and Communications conference

作者： Fei, Hong Zhimei, Wu Multimedia and Network Res. Ctr. Institute of Software Chinese Academy of Sciences P.O. Box 8718 Beijing 100080 China

关键词： Telecommunication traffic

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A Scalable Environment for Quality of Service Measurements in the Internet

A Scalable Environment for Quality of Service Measurements i...

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Proceedings of the Second IASTED International conference on Communications, Internet, and Information Technology

作者： Dressler, Falko University of Erlangen-Nuremberg Department of Computer Science Regional Computing Center Martensstr. 1 91058 Erlangen Germany

ISBN: (纸本)0889863989

The goal of this paper is to describe a scalable environment for quality of service (QoS) measurements in the internet. Since the early beginnings of communication networks, measurements of the QoS in the network have been developed and performed for several reasons. First, it was necessary to identify the capabilities of the different types of data networks and to compare them with analytical examinations. Secondly, with the evolving appearance of real-time applications such as multimedia transmissions or remote controls, the demands on the service quality of current network topologies and protocols have rapidly increased. This paper summarizes the available measurement techniques, especially in the case of IP multicast and proposes a measurement environment which builds a base for any kind of quality of service measurements in the internet, either unicast or multicast. The focus of this approach is on the scalability of such measurements which have to coexist with the standard applications in the same networking environment.

关键词： Internet

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