Chair of
Multimedia Communications and Signal Processing
Prof. Dr.-Ing. André Kaup
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Scalable Vidoe Streaming for Wireless Video-On-Demand Services

Field of activity: Video Signal Processing and Transmission
Research topic: Video Coding and Transmission
Staff: Dr.-Ing. Niko Färber
Dr.-Ing. Stefan Petrausch
Dr.-Ing. Klaus Stuhlmüller
Dipl.-Ing. Wolfgang Sörgel

With the introduction of 3rd generation mobile radio systems, like UMTS, multimedia applications can be made available. The architecture of these networks is heterogeneous and data transmission may not be reliable. We present a concept to overcome these problems for a video-on-demand application which we have also implemented as an Internet application as part of the Ericsson project. This implementation allows interactive video streaming from a video server to a client integrated into a web browser.

One key element of our approach is scalable video coding: A video presentation is encoded into a base layer providing basic video quality at low bit rate and one or more enhancement layers. These enhancement layers successively improve the quality of the displayed video when received in addition to the base layer, at the cost of higher bit rate and increased hardware requirements at the client. Scalable video coding schemes hence provide adaptability to different available bandwidths and client capabilities combined with efficient compression.
Robustness with respect to packet loss can be gained by a transmission flow control algorithm which is adapted to scalable video coding. We assume that the mobile client indicates loss of data to the server over a feedback channel. Our proposed transmission scheme now protects the more important data in the base layer and lower enhancement layers by transmitting them ahead in time and so allowing for more transmission attempts in case of errors. We show how prefetch time for each layer can determined so that overall video quality is optimized.
In a further step we demonstrate that for efficient video transmission from a central video server to a mobile client, a proxy server with buffering and computation ability should be used to connect the core network and the radio channel at the base station. This allows to make optimal use of network capabilities instead of combining the disadvantages of core network and radio link by simply bridging them.

Our practical implementations are augmented by theoretical analysis of the scenario of concatenated channels with optimal coding and flow control.

Publications

2004-3
CRIS
S. Petrausch, W. Sörgel, A. Kaup
   [bib]

Serially Connected Channels: Capacity and Video Streaming Application Scenario for Separate and Joint Channel Coding
5th International ITG Conference on Source and Channel Coding (SCC), Pages: 271-277, Erlangen, Germany, ITG Fachbericht, Jan. 2004
2000-52
CRIS
K. Stuhlmüller
   [bib]

Modeling and Optimization of Video Transmission Systems
Berichte aus der Kommunikations- und Informationstechnik, Vol. 17, Shaker Verlag, Aachen, Germany, Aug. 2000
2000-51
CRIS
N. Färber
   [bib]

Feedback-Based Error Control for Robust Video Transmission
Berichte aus der Kommunikations- und Informationstechnik, Vol. 14, Shaker Verlag, Aachen, Germany, May 2000
2000-19
CRIS
K. Stuhlmüller, N. Färber, B. Girod
   [bib]

Trade-Off between Source and Channel Coding for Video Transmission
Int. Conf. on Image Processing (ICIP'2000), Vancouver, Sep. 2000
2000-19
CRIS
K. Stuhlmüller, N. Färber, B. Girod
   [bib]

Trade-Off between Source and Channel Coding for Video Transmission
Int. Conf. on Image Processing (ICIP'2000), Vancouver, Sep. 2000
2000-1
CRIS
K. Stuhlmüller, N. Färber, M. Link, B. Girod
   [bib]

Analysis of Video Transmission over Lossy Channels
IEEE Journal on Selected Areas in Communications, special issue on Error-Resilient Image and Video Transmission (JSAC) Vol. 18, Num. 6, Pages: 1012-1032, Jun. 2000
2000-1
CRIS
K. Stuhlmüller, N. Färber, M. Link, B. Girod
   [bib]

Analysis of Video Transmission over Lossy Channels
IEEE Journal on Selected Areas in Communications, special issue on Error-Resilient Image and Video Transmission (JSAC) Vol. 18, Num. 6, Pages: 1012-1032, Jun. 2000
1999-20
CRIS
N. Färber, K. Stuhlmüller, B. Girod
   [bib]

Analysis of Error Propagation in Hybrid Video Coding with Application to Error Resilience
International Conference on Image Processing ICIP-99, Kobe, Japan, Oct. 1999
1999-12
CRIS
K. Stuhlmüller, M. Link, B. Girod, U. Horn
   [bib]

Scalable Internet Video Streaming With Unequal Error Protection
Packet Video Workshop, New York, Apr. 1999
1999-1
CRIS
B. Girod, K. Stuhlmüller, M. Link, U. Horn
   [bib]

Packet Loss Resilient Internet Video Streaming
Visual Communications and Image Processing '99, San Jose, CA, Jan. 1999
1998-28
CRIS
B. Girod, N. Färber, K. Stuhlmüller
   [bib]

Internet Video-Streaming
Proc. of 10th Tyrrhenian Int. Workshop on Digital Communications, Ischia, Sep. 1998
1998-28
CRIS
B. Girod, N. Färber, K. Stuhlmüller
   [bib]

Internet Video-Streaming
Proc. of 10th Tyrrhenian Int. Workshop on Digital Communications, Ischia, Sep. 1998
1997-40
CRIS
B. Girod, N. Färber, U. Horn
   [bib]

Scalable Codec Architctures for Internet Video-on-Demand
Proc. 1997 Asilomar Conference on Signals and Systems, Pacific Grove, CA, USA, Nov. 1997
1997-39
CRIS
N. Färber, B. Girod
   [bib]

Robust H.263 Compatible Video Transmission for Mobile Access to Video Servers
Proc. IEEE International Conference on Image Processing (ICIP 97), Vol. 2, Pages: 73-76, Oct. 1997