MPEG-21 Cross-Layer QoS Adaptation for Mobile IPTV Service Delivery
Résumé
Future multimedia services platforms will allow the user to access and consume a rich set of multimedia content over dynamic and heterogeneous networks and devices. To rich this universal accessibility, the MPEG- 21 multimedia framework is defining a normative open framework for the entire multimedia content delivery chain (content creation, production, delivery, trade and consumption). The forthcoming communication systems (IPTV, IPPhone, visioconference, etc) have to support the user's needs, the terminal capabilities, the content specification and the underlying networking technologies. In these new systems the QoS should be maintained across network domains (horizontally) and across network layers (vertically) which lead to crosslayer QoS interaction. This paper presents an architecture and implementation of IPTV service delivery enhanced by an MPEG-21 cross-layer QoS adaptation. The proposed system allows seamless IPTV access for heterogeneous devices and networks capabilities. The MPEG-21 framework is used to provide a common support for implementing and managing the end-to-end QoS. Extensive performance evaluations using an experimental test-bed show the ability of our architecture to allow universal media access to digital content for a multitude of clients. Moreover, the proposed cross-layer QoS reduces considerably packet loss and enhances the perceived quality of the IPTV service.