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Signal Processing: Image Communication 20 (2005) 755772 Proxy-assisted interactive-video services over networks

Summary: Signal Processing: Image Communication 20 (2005) 755≠772
Proxy-assisted interactive-video services over networks
with large delays$
Ali C. Begen, Yucel Altunbasak√
School of Electrical and Computer Engineering, Georgia Institute of Technology, Atlanta, GA, USA
Received 27 April 2005; accepted 2 May 2005
While emerging broadband access technologies such as DSL and cable are making multimedia services feasible and
economically attractive for end-users, there still exist several hurdles in terms of service sustainability and reliability.
Unfortunately, without the desired quality-of-service (QoS) support, tackling these hurdles with traditional solutions is
an insuperably difficult task. Yet, novel designs that are proven to be useful in various scenarios may easily fail when
the underlying network experiences severe packet loss or delay. Such circumstances are unavoidable in today's best-
effort Internet and will likely prevail in the near future as well. A promising approach in satisfying the stringent
requirements of delay-intolerant video applications is to benefit from configurable proxies. In this study, we introduce a
versatile proxy-based solution to enhance the performance of such applications running over networks with large
delays. We first propose a methodology that accurately identifies lost packets in real time. This methodology is then
used by the proxy and end-users to improve the error-control/protection capability of the video applications. By
Internet experiments between the US and Europe, we demonstrate the effectiveness and potential benefits of the
proposed approach.
r 2005 Elsevier B.V. All rights reserved.


Source: Altunbasak, Yucel - School of Electrical and Computer Engineering, Georgia Institute of Technology


Collections: Engineering