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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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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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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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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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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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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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An adaptive distributed call admission control for QoS-sensitive wireless mobile networks

An adaptive distributed call admission control for QoS-sensi...

引用

IEEE conference on Wireless Communications and networking

作者： Y. Iraqi R. Boutaba Department of Computer Science University of Waterloo Waterloo Canada

ISBN: (纸本)0780365968

This paper introduces an adaptive distributed call admission control framework developed for cellular mobile networks. The main feature of the proposed framework is a more efficient support for mobile multimedia users having dynamic bandwidth requirements. This is achieved by imposing an upper bound on the experienced call dropping probability, regardless of network load changes, while maintaining a high network resource utilization. The call admission control algorithm presented in this paper involves not only the original cell (handling the new admission request) but also a cluster of neighboring cells. The neighboring cells provide significant information about their ability to support the new mobile user in the future. This distributed process allows the original cell to make a more clear-sighted admission decision for the new user. The cell changes the acceptance threshold dynamically to maintain a target call dropping probability. Simulations are provided to show the improvements obtained using our framework.

关键词： Programmable control Adaptive control Call admission control Bandwidth Wireless networks Mobile computing Cellular networks Clustering algorithms Upper bound Base stations

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A predictive paging scheme for IMT-2000 systems

A predictive paging scheme for IMT-2000 systems

引用

IEEE conference on Vehicular Technology (VTC)

作者： Wenye Wang I.F. Akyildiz Broadband and Wireless Networking Lab School of Electrical and Computer Engineering Georgia Institute of Technology Atlanta GA USA

Paging is a process to locate mobile terminals in wireless systems, which is initiated by the users calling from a fixed or mobile environment. In particular, the paging issue in IMT-2000 systems is very important to maintain the wireless services to the mobile subscribers who are allowed to roam in different systems instead of stand-alone systems. We introduce a predictive paging scheme based on the concept of a boundary location register. We develop the corresponding signaling messages to describe the call delivery procedure of intersystem roaming. Since paging costs are associated with bandwidth utilization and delays influence call setup time, they are used as metrics in evaluating the performance of the proposed paging scheme.

关键词： Paging strategies Costs Delay Roaming Quality of service Mobile computing Bandwidth multimedia systems Telecommunications Personal communication networks

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MARCH: a medium access control protocol for multihop wireless ad hoc networks

MARCH: a medium access control protocol for multihop wireles...

引用

MILCOM, Military Communications conference

作者： C.-K. Toh V. Vassiliou G. Guichal C.-H. Shih Mobile MultiMedia and HiSpeed Networking Laboratory School of Electrical and Computer Engineering Georgia Institute of Technology USA

ISBN: (纸本)0780365216

The multiple access with reduced handshake (MARCH) protocol utilizes the broadcast characteristics of an omnidirectional antenna to reduce the number of control messages required to transmit a data packet in multihop ad hoc networks. In MARCH, the RTS-CTS handshake is used only by the first hop of a route to forward data packets while for the rest it utilizes a new CTS-only handshake. Since fewer control packets are transmitted, the probability of packet collision is reduced and therefore the channel throughput is increased. Simulation results demonstrate that MARCH outperforms MAC protocols that employ only the RTS-CTS handshake.

关键词： Media Access Protocol Wireless application protocol Access protocols Spread spectrum communication Ad hoc networks Throughput Mobile ad hoc networks Multiaccess communication Road accidents Mobile computing

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Experiences of developing and deploying a context-aware tourist guide: the GUIDE project 00

Experiences of developing and deploying a context-aware tour...

引用

Proceedings of the 6th annual international conference on Mobile computing and networking

作者： Keith Cheverst Nigel Davies Keith Mitchell Adrian Friday Distributed Multimedia Research Group Lancaster University Lancaster LA14YR U.K.

ISBN: (纸本)9781581131970

The GUIDE system has been developed to provide city visitors with a hand-held context-aware tourist guide. The system has been successfully deployed in a major tourist destination and is currently at the stage where it is publicly available to visitors who wish to explore the city. Reaching this stage has been the culmination of a number of distinct research efforts. In more detail, the development of GUIDE has involved: capturing a real set of application requirements, investigating the properties of a cell-based wireless communications technology in a built-up environment and deploying a network based on this technology around the city, designing and populating an information model to represent attractions and key buildings within the city, prototyping the development of a distributed application running across portable GUIDE units and stationary cell-servers and finally, evaluating the entire system during an extensive field-trial study. This paper reports on our results in each of these areas. We believe that through our work on the GUIDE project we have produced a blueprint for the development of interactive context-aware systems that should be of real value to those in the community who wish to develop such systems in a practical environment.

关键词： Web-based interactive evaluation context-aware

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