ISSN : 1796-203X
Volume : 1    Issue : 2    Date : May 2006

The Layer-Independent Descriptor Concept
Attila Takács, Ákos Kovács, István Gódor, Franz Kalleitner, Hermann Brand, Marcus Ek, Tomas
Stefansson and Frank Sjöberg
Page(s): 23-32
Full Text:
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With the fast improvements of broadband technologies, more and more demanding services can
be accessed. Broadband access is supported by a range of wireless and wireline technologies.
Well known representatives are WLAN and UMTS for wireless and xDSL for wireline access.
However, the highly varying nature of wireless channels and the crosstalk behavior of the DSL
channel are typical traits, and most challenging to combat. Moreover, the stringent requirements of
real-time applications require enhancements in service delivery. The tremendous interest in
communication has driven the deployment of new access systems. Hence, for the End-to-End point
of view, the service delivery multifarious due to the heterogeneity of the underlying transport network.
Therefore, to enable a transport independent path set-up, application and network properties that
may influence the user-perceived quality need to be unified. Thereby, media scalability plays a key
role. Recently, cross-layer communication is getting acceptance as a method that efficiently
increases the system performance. Unlike previous works that mainly addressed the issue of
application based feedback, we focus on the information that the application can provide to guide
the network for local stream management. We present the necessary set of Application Layer
information for scalable audiovisual streams to offer individual QoS, at lowermost packet overhead.
Finally, we show the sustainable gain in system performance based on a DSL use-case.

Index Terms
Cross-layer Communication, Scalable Media Encoding, Quality of Service, Local Rate Adaptation,
Resource Management