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International Journal of Digital Multimedia Broadcasting
Volume 2008 (2008), Article ID 835438, 12 pages
http://dx.doi.org/10.1155/2008/835438
Research Article

Context-Aware UPnP-AV Services for Adaptive Home Multimedia Systems

M3-Systems Research Laboratory, Institute of Information Technology, University of Klagenfurt, 9020 Klagenfurt, Austria

Received 25 June 2008; Accepted 15 July 2008

Academic Editor: Harald Kosch

Copyright © 2008 Roland Tusch et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

One possibility to provide mobile multimedia in domestic multimedia systems is the use of Universal Plug and Play Audio Visual (UPnP-AV) devices. In a standard UPnP-AV scenario, multimedia content provided by a Media Server device is streamed to Media Renderer devices by the initiation of a Control Point. However, there is no provisioning of context-aware multimedia content customization. This paper presents an enhancement of standard UPnP-AV services for home multimedia environments regarding context awareness. It comes up with context profile definitions, shows how this context information can be queried from the Media Renderers, and illustrates how a Control Point can use this information to tailor a media stream from the Media Server to one or more Media Renderers. Moreover, since a standard Control Point implementation only queries one Media Server at a time, there is no global view on the content of all Media Servers in the UPnP-AV network. This paper also presents an approach of multimedia content integration on the Media Server side that provides fast search for content on the network. Finally, a number of performance measurements show the overhead costs of our enhancements to UPnP-AV in order to achieve the benefits.