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ABSTRACT: This paper describes the concept of service blending—the ability of two or more services to interact under a unified control scheme. We introduce a novel infrastructure component, Service Broker, designed to support efficient blending through dynamically loadable program modules called steplets. We demonstrate their use through implementation of two IPTV-based service examples.
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ABSTRACT: Content-centric networking is a novel paradigm for the Future Internet. This paper argues that content-centric net-working should be generalized towards a service-centric net-working scheme. We propose a service-centric networking design based on an object-oriented approach, in which content and ser-vices are considered objects. We show implementation architec-tures for example services and how these can benefit from ser-vice-centric networking.
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ABSTRACT: Existing Swarm-based Peer-to-Peer Streaming (SPS) applications rely on random connected overlays among peers, which tend to generate a significant amount of costly inter-ISP traffic. To reduce such traffic, localization of overlay connectivity within each ISP has received a great deal of attention by researchers. In this paper, we examine the performance of SPS mechanisms for live video over localized overlays, show that localization significantly degrades their performance, and identify the underlying performance bottlenecks. Leveraging these insights, we propose a novel two-tier overlay-aware block scheduling scheme called OLIVES that differentiates inter and intra-ISP scheduling. OLIVES adopts an implicit coordination between edge peers of each ISP with external parents to ensure proper diffusion of all blocks to each ISP. Moreover, we show that the required buffer size in the localized overlay is significantly larger than the random overlay and propose a shortcutting method to reduce the buffer size. Through analysis and extensive simulations, we demonstrate the ability of OLIVES to deliver high quality stream over localized overlays while minimizing the associated inter-ISP traffic.
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ABSTRACT: This paper presents an Incentive-based Sharing (iShare) protocol that blends cellular and ad hoc networks for content dissemination services. With iShare, mobile users download content from a source via cellular links and at the same time form a mesh ad hoc network for peer-to-peer exchange of content data. The mesh remains robust to network dynamics, minimizes ad hoc communication overhead, and parallelizes the downloading process among mesh members. In order to counter selfish behavior, we apply an efficient and practical "tit-for-tat" incentive mechanism, which exploits proximity and mutual content interest of mobile users. This mechanism becomes particularly effective in the case of network dynamics since we utilize promiscuous and broadcast modes of the ad hoc channel. As a result, our protocol effectively helps to free resources in the cellular network and accelerates the content download for its users. Furthermore, it enables users to continuously obtain data via ad hoc connections during cellular handoff periods and provides multi-homing downloads for groups spanning adjacent cells. We evaluate the performance of iShare by means of simulations and compare it to other content dissemination schemes using cellular broadcast channels, cellular unicast channels, and tree-based protocols. The obtained results show that iShare significantly outperforms alternative approaches and creates a win-win situation by improving performance of both iShare and other mobile users.
