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This paper addresses the following foundational question: what is the maximum theoretical delay performance achievable by an overlay peer-to-peer streaming system where the streamed content is subdivided into chunks? As shown in this paper, when posed for chunk-based systems, and as a consequence of the store-and-forward way in which chunks are delivered across the network, this question has a fundamentally...
Many distribution algorithms have been proposed up to now for P2P real time streaming. However, due to the lack of basic theoretical results and bounds, common sense and intuitions and heuristics have driven their design so far. The consequence is that we can find in the literature a large variety of different choices about the main aspects of a P2P system, such as overlay topology, scheduling process...
In this paper we introduce SMILE (simple middleware independent layer), a framework whose main purpose is to facilitate the development of distributed applications. In the SMILE abstraction an application is composed by a set of processes that exchange information. The interfaces of these processes are described using WSDL or by an equivalent UML definition. Using the open source AndroMDA tool and...
In the recent years, there has been an increasing need to capture positioning informations, basically based on GPS systems. The informations retrieved by these satellite systems may be not always available in specific scenarios like indoor areas, tree-covered zones or urban canyons. On the other hand, thanks to the technical advances in wireless networking, low cost 802.11 Wi-Fi networks can be exploited...
This position paper aims at proposing a new relative localization strategy for GSM cellular networks. We in particular consider a GSM network scenario where only a limited number of mobile phones is at known positions. This is the case of mobile phones which are equipped with satellite navigation receivers and know their absolute position. Such mobile phones will be referred to as located mobile phones...
The actual standards for service authoring, composition and development are not easy to port and to apply for next generation mobile applications. This paper describes some tools that we're developing in the context of the IST-Simple Mobile Service project, whose aim is to ease the authoring and the use of services for mobile devices. We propose a service composition approach using an UML profile...
Two related needs are of growing importance in current and future networks: the necessity of defining, managing and storing user-related information and the necessity of uniquely identify a user across different communications technologies and service platforms. This functionality can be exploited on the user side to personalize services, to improve the portability of services over heterogeneous terminals...
This position paper aims at proposing the use of satellite-based communication systems, which will play an ever increasing role in the future aeronautical communication services, to enable the real time transmission of flight information and black boxes data. Besides the immediate availability of the black boxes data after an air crash, the amount and the kind of the recorded data may be augmented,...
As technology develops, people are using an ever broader and heterogeneous range of ICT devices and network-based services. The result is an enormous burden of complexity on the shoulders of users, service providers and network operators. The goal of the Simplicity project, supported by the European Union, is to reduce this complexity by: (i) providing automatic customization of user access to services...
Satellite onboard switching capabilities, and their possibility to enable "over-the-air" networks, are a strongly innovative achievement of modern satellite communication. The exploitation of satellite networking is especially relevant in the case of low Earth orbit satellites (LEO), where the reduced latency makes a LEO mesh network highly appealing and competitive with terrestrial solutions...
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