453 research outputs found

    Overlay networks for smart grids

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    Multicast Scheduling and Resource Allocation Algorithms for OFDMA-Based Systems: A Survey

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    Multicasting is emerging as an enabling technology for multimedia transmissions over wireless networks to support several groups of users with flexible quality of service (QoS)requirements. Although multicast has huge potential to push the limits of next generation communication systems; it is however one of the most challenging issues currently being addressed. In this survey, we explain multicast group formation and various forms of group rate determination approaches. We also provide a systematic review of recent channel-aware multicast scheduling and resource allocation (MSRA) techniques proposed for downlink multicast services in OFDMA based systems. We study these enabling algorithms, evaluate their core characteristics, limitations and classify them using multidimensional matrix. We cohesively review the algorithms in terms of their throughput maximization, fairness considerations, performance complexities, multi-antenna support, optimality and simplifying assumptions. We discuss existing standards employing multicasting and further highlight some potential research opportunities in multicast systems

    Internet protocol television (IPTV): The Killer application for the next-generation internet

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    Internet Protocol Television (IPTV) will be the killer application for the next-generation Internet and will provide exciting new revenue opportunities for service providers. However, to deploy IPTV services with a full quality of service (QoS) guarantee, many underlying technologies must be further studied. This article serves as a survey of IPTV services and the underlying technologies. Technical challenges also are identified

    The Changing Patterns of Internet Usage

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    Symposium: Essays from Time Warner Cable\u27s Research Program on Digital Communications

    The Changing Patterns of Internet Usage

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    The Internet unquestionably represents one of the most important technological developments in recent history. It has revolutionized the way people communicate with one another and obtain information and created an unimaginable variety of commercial and leisure activities. Interestingly, many members of the engineering community often observe that the current network is ill-suited to handle the demands that end users are placing on it. Indeed, engineering researchers often describe the network as ossified and impervious to significant architectural change. As a result, both the U.S. and the European Commission are sponsoring “clean slate” projects to study how the Internet might be designed differently if it were designed from scratch today. This Essay explores emerging trends that are transforming the way end users are using the Internet and examine their implications both for network architecture and public policy. These trends include Internet protocol video, wireless broadband, cloud computing programmable networking, and pervasive computing and sensor networks. It discusses how these changes in the way people are using the network may require the network to evolve in new directions

    The Changing Patterns of Internet Usage

    Get PDF
    The Internet unquestionably represents one of the most important technological developments in recent history. It has revolutionized the way people communicate with one another and obtain information and created an unimaginable variety of commercial and leisure activities. Interestingly, many members of the engineering community often observe that the current network is ill-suited to handle the demands that end users are placing on it. Indeed, engineering researchers often describe the network as ossified and impervious to significant architectural change. As a result, both the U.S. and the European Commission are sponsoring “clean slate” projects to study how the Internet might be designed differently if it were designed from scratch today. This Essay explores emerging trends that are transforming the way end users are using the Internet and examine their implications both for network architecture and public policy. These trends include Internet protocol video, wireless broadband, cloud computing programmable networking, and pervasive computing and sensor networks. It discusses how these changes in the way people are using the network may require the network to evolve in new directions
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