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Wireless awareness for multimedia applications

Wireless awareness for multimedia applications

引用

International Conference on Communication Technology (ICCT)

作者： Liang Cheng I. Marsic Department of Electrical and Computer Engineering State University of New Jersey Rutgers Piscataway NJ USA

Wireless awareness is the capability of networking applications to be aware of the existence and characteristics of wireless links in the communication path. Based on the separation principle, which states that media transfer, control and management are functionally distinct architecture activities, this paper focuses on the wireless awareness architecture and approaches other than adaptation schemes for wireless multimedia applications. The uniqueness of this research is that wireless awareness is studied in such a systematic way that the existence and characteristics of the wireless links are investigated from both the end-host's and the network's point of view. Two approaches are proposed to make multimedia applications wireless aware, i.e. the end-host approach by accessing the device driver of the network interface card and the network approach by instrumenting round-trip-time values of communication entities. Experiments show that, by deploying wireless awareness, the multimedia application can adapt to the wireless networking environment proactively and reactively.

关键词： Quality of service Bandwidth Portable computers Wireless networks Propagation losses Application software multimedia computing Delay Telecommunication traffic Streaming media

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Delay-constrained localized multicast routing

Delay-constrained localized multicast routing

引用

International Conference on Communication Technology (ICCT)

作者： Liu Ying Liu Sanyang Department of Math Xidian University Xi'an China

Delay-constrained multicasting is a fundamental issue in distributed computing and networking. It can be formulated as that of finding a minimum-cost Steiner tree with bounded end-to-end delay along the path from the source node to each destination node and is known to be NP-complete. Several heuristics have been presented for this problem, but most of them require global information in order to construct a multicast tree. Our algorithm uses information only from neighboring nodes, which makes it more practical. The algorithm performs as well as some heuristics using global information.

关键词： Delay Routing Multicast algorithms Costs Distributed computing Steiner trees Electronic mail multimedia systems multimedia computing Unicast

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A characteristics-based bandwidth reduction technique for pre-recorded videos

A characteristics-based bandwidth reduction technique for pr...

引用

IEEE International Conference on multimedia and Expo (ICME)

作者： W. Tavanapong S. Krishnamohan Department of Computer Science Iowa State University Ames IA USA

Advances in networking infrastructures, computing capabilities, multimedia processing technologies, and the World Wide Web have brought about real-time delivery of multimedia content through the Internet. While more communication bandwidth is expected in the near future, it is either costly or unavailable to a large number of users. For important applications such as distance learning to be successful, bandwidth limitations must be taken into account. We propose a novel approach using unique characteristics of lecture videos to mitigate their bandwidth requirement for distance learning applications. The experimental results on our test videos demonstrate that when using our approach, the bandwidth requirement is reduced down to only about 4% of the video encoded in MPEG and about 13% of the same video in real format.

关键词： Bandwidth Videos multimedia computing Computer networks Web sites Costs Modems Cameras Computer science Testing

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Handoff rerouting scheme for multimedia connections in ATM-based mobile networks

Handoff rerouting scheme for multimedia connections in ATM-b...

引用

IEEE Conference on Vehicular Technology (VTC)

作者： J. McNair I.F. Akyildiz S. Radhakrishnan G. Racherla School of Computer Science University of Oklahama Norman OK USA Broadband & Wireless Networking Laboratory School of Electrical & Computer Engineering Georgia Institute of Technology Atlanta GA USA

Future wireless networks promise multimedia communication and computing services for both fixed and mobile users. One of the most important challenges of wireless multimedia service for mobile users is maintaining a guaranteed quality of service over end-to-end connections with multiple mobile endpoints. In this paper, we describe a new handoff routing scheme that supports multimedia traffic in a connection-oriented mobile network, such as Mobile ATM. We analyze and compare the performance of the new scheme with respect to three related handoff rerouting schemes for connection-oriented wireless networks. The new technique shows a superior performance in route efficiency and bandwidth consumption for all traffic types, and a smaller handoff delay for delay sensitive traffic.

关键词： Telecommunication traffic Wireless networks Delay multimedia communication multimedia computing Mobile communication Computer networks Mobile computing Quality of service Routing

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A multi-constrained distributed QoS routing algorithm

A multi-constrained distributed QoS routing algorithm

引用

IEEE International Conference on Networks

作者： Jun Song Hung Keng Pung L. Jacob Department of Computer Science School of Computing National University of Singapore Singapore

ISBN: (纸本)0769507778

Multi-criteria QoS routing has been regarded by researchers as a vital mechanism to support multimedia communications. Unfortunately, finding a qualified path meeting the multiple criteria is indeed a very difficult problem to solve. Multi-path-constrained routing problems are considered to be NP complete, and most existing QoS routing algorithms are based on maintaining global network state at every node. This paper proposes a multi-constrained flooding-based QoS routing with minimum computation and implementation complexity which relies on local link-state information only. It takes the least delay to establish a QoS connection which meets all QoS requirements and addresses the "over-reservation" problem of the flooding-based QoS routing in an elegant and efficient manner. We study the performance of the proposed algorithm, in terms of blocking probability, routing overhead, and connection set-up time, through simulation.

关键词： Routing Quality of service Communication system traffic control Jacobian matrices multimedia communication Traffic control Bandwidth Distributed computing Testing Computer science

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Integrating concurrency control and distributed data into workflow frameworks: an actor model perspective

Integrating concurrency control and distributed data into wo...

引用

IEEE International Conference on Systems, Man and Cybernetics

作者： A. Esposito V. Loia Dipartimento di Matematica e Infomatica Università di Salemo Baronissi Salerno Italy

Technological advances in processor power, networking, telecommunications and multimedia are stimulating the development of applications requiring parallel and distributed computing. This new perspective is enticing research into new design methodologies that view the software as an "intelligent" collection of agents that interact by coordinating knowledge-based processes. We present an actor-based workflow architecture that would fit naturally into distributed heterogeneous environments. The actors combine object-oriented and functional programming in order to make the management of concurrency easier for the user.

关键词： Concurrency control Object oriented modeling Distributed computing Concurrent computing Message passing multimedia computing Design methodology Computer architecture Functional programming Artificial intelligence

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Lessons Learned from the Design of a Mobile multimedia System in the MOBY DICK Project 00

Lessons Learned from the Design of a Mobile Multimedia Syste...

引用

Proceedings of the 2nd international symposium on Handheld and Ubiquitous computing

作者： Gerard J. M. Smit Paul J. M. Havinga

ISBN: (纸本)9783540410935

Recent advances in wireless networking technology and the exponential development of semiconductor technology have engendered a new paradigm of computing, called personal mobile computing. This offers a vision of the future with a much richer and more exciting set of architecture research challenges than extrapolations of the current desktop architectures. In particular, these devices will have limited battery resources, will handle diverse data types, and will operate in environments that are insecure, dynamic and which vary significantly in time and location. The research performed in the MOBY DICK project is about designing such a mobile multimedia system. This paper discusses the approach made in the MOBY DICK project to solve some of these problems, discusses its contributions, and accesses what was learned from the project.

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PARK: a paused-and-run k-stream multimedia synchronization control scheme

PARK: a paused-and-run k-stream multimedia synchronization c...

引用

International Conference on Distributed computing Systems

作者： Chung-Ming Huang Hsu-Yang Kung Jiong-Liang Yang Laboratory of Multimedia Networking LMN Department of Computer Science and Information Engineering National Cheng Kung University Tainan Taiwan

In the paper, we propose the pause-and-run approach for k-stream (PARK) multimedia presentations over the Internet to achieve reliable transmission of continuous media. The main characteristics of the PARK approach are as follows: (i) to achieve reliable transmission of continuous media, PARK adopts TCP instead of UDP; (ii) since the slow-start scheme is embedded in TCP, a novel flow adaptation scheme is proposed to reduce the overhead of the network and end hosts. The server adapts its transmission rates to the buffer situation of the client and prevents the client's buffers from overflow and underflow as much as possible; (iii) with the provision of multiple-stream synchronization and multi-level adaptation control, the client achieves smooth multimedia presentations and achieves graceful presentation degradation when the resources are insufficient.

关键词： Streaming media Delay IP networks Network servers Laboratories Computer science Reliability engineering Computer network reliability Degradation Internet

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Localization of mobile terminals, based on a hybrid satellite-assisted and network-based techniques

Localization of mobile terminals, based on a hybrid satellit...

引用

IEEE Conference on Wireless Communications and networking

作者： S. Kyriazakos D. Drakoulis M. Theologou J.-A. Sanchez-P. Telecommunications Laboratory Department of Electrical Engineering and Computer Science National and Technical University of Athens Athens Greece

ISBN: (纸本)0780365968

Position location of mobile terminals is one of the key and vital services for enhanced network performance. A variety of services may be offered when position location is deployed, such as emergency-call assistance, fleet management, location-based value added and multimedia services, navigation, stolen vehicle monitoring, improved network management and differential billing. Players in this area, nowadays and worldwide, are trying to integrate positioning techniques that will fulfill related FCC- and ETSI- localization recommendations, yet without exaggerating the network costs. Major European manufacturers have already developed positioning methods, yet none of them have been adopted in a cellular networking environment. In this contribution a novel technique is presented and its performance and compliance with the related standards is evaluated.

关键词： FCC Disaster management Telecommunication standards Global Positioning System Costs Land mobile radio cellular systems Vehicles Monitoring Manufacturing Mobile computing

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QoS in next generation Internet

QoS in next generation Internet

引用

International Conference on High Performance computing in the Asia-Pacific Region

作者： D.C. Wan National Center for High Performance Computing China

The recent popularity in the use of multimedia software and applications is creating increasing demand on the Internet to support quality of service (QoS). The problems of most concern in the next-generation Internet (NGI), such as bandwidth and latency, have solutions via DWDM (dense wavelength division multiplexing), high-speed switches/routers, etc. QoS seems to be one of the few aspects remaining without having a clear final standard specified so far, due to its complexity and interoperability issues. This paper introduces QoS and clarifies its status and the latest possible solutions, such as MPLS (Multiple Protocol Label Switching), RSVP (Resource Reservation Protocol), DiffServ (Differentiated Service), etc., for practical implementations of optical networking in NGI with better QoS features.

关键词： Quality of service Wavelength division multiplexing Protocols Software quality Application software Web and internet services Bandwidth Delay Switches Multiprotocol label switching

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