F. Kalleitner, M. Konegger (Austria), A. Takács, and Á. Kovács (Hungary)
Communication System, multimedia deli -very, wireless, cross-layer signalling
Today, audiovisual communication over wireless networks is widespread deployed over the whole world. Indeed wire less voice communication were representing the emerging service over the last years. During the last decades, me dia transmission over wireless access networks was con tinuously improved, while worldwide active standardiza tion organization, i.e. Third Generation Partnership Project (3GPP) or other IMT-2000 family members have actively contributed to this process. Recently new media encod ing technologies based on an layered architecture offers a next generation method in audiovisual media delivery, inherently usable for optimized and efficient transmission over wireless packet switched transport and access net works. Emphasizing that a per media frame prioritiza tion can be achieved by such layered encoding. How ever, the highly varying nature of wireless channels and the stringent requirement of real-time application require en hancements of service delivery. Thus, extensions on con tent based packet scheduling is required to achieve a high user-perceived quality for the transmission over highly er ror prone channels. We describe the method and design of a content based, per-packet scheduling, we either build upon the layered architecture, which provide an informa tion about the importance for each media frame, scheduled for delivery. We investigated that cross-layer information is required to facilitate an extended packet scheduling with the aim to maintain the delivery performance of common and shared transport channels. The approach presented herein, has been developed by the Multimedia Pipe (M PIPE) project. 1
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