New technologies as well as new ways of using network services are rapidly changing the Internet's landscape. These developments will have far-reaching implications for the architecture of the networks of the future. However, the current Internet design is plagued with a number of fundamental limitations, which makes its use as the sole basis for the networking applications of the future questionable. We believe that the Future Internet must allow the co-existence of diverse network designs and paradigms, both new and old, to remain open to innovation and meet the challenges of the future. In this paper, we propose to use network virtualization, embedded in an architectural framework, to achieve this goal and to lay the foundation for the deployment of novel concepts such as content-centric networking.
The demand of both the new telecom industry and digital broadcasters for cost-efficient provisioning of mobile multimedia services faces the reality of scarce radio resources. Various digital mobile and broadcast radio technologies have been developed and specifically been optimized. However, existing and emerging multimedia services exhibit challenging requirements in terms of asymmetry, interactivity, real time, and mulicast communication. This article describes an evolution of an IP-based infrastructure from today's networks toward a future multi-radio infrastructure, taking into account the implications on the end-user terminal. This multi-radio infrastructure enables the cooperation of existing radio networks to combine their spectrum-efficient capabilities, whereby high-quality mobile multimedia services shall be provided. Furthermore, the need for dynamic allocation of spectrum to radio services is motivated. The basic functionality and architecture of a multi-radio system are outlined, with a special emphasis on cooperation between different radio systems. Also, an evolution path for the convergence of broadcast and new telecom is described, starting from today's systems and leading to a fully coordinated system.
Abstract. Digital movie systems o er great perspectives for multimedia applications. But the large amounts of data involved and the demand for isochronous transmission and playback are also great challenges for the designers of a new generation of le systems, database systems, operating systems, window systems, video encoder decoders and networks. Today's research prototypes of digital movie systems su er from severe performance bottlenecks, resulting in small movie windows, low frame rates or bad image quality or all of these. We consider the performance problem to be the most important problem with digital movie systems, preventing their widespread use today. In this paper we address performance issues of digital movie systems from a practical perspective. We report on performance experience gained with the XMovie system, and on new algorithms and protocols to overcome some of these bottlenecks.
This article provides an overview of ongoing research within the framework ScaleNet. Considering IP as the basis transport scheme, the wireless and the wireline world have just started to move towards each other. ScaleNet is pushing this development by evolving a new system concept and by developing technologies for Fixed & Mobile Convergence.
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