Distributed Coordination and Cross Layer Optimization in Multi-Access Wireless Video Streaming

Speaker:	Dr. Zhu LI
		Principal Staff Research Engineer
		Multimedia Research Laboratory
		Motorola Labs, USA

Title:		"Distributed Coordination and Cross Layer Optimization
		 in Multi-Access Wireless Video Streaming"

Date:		Tuesday, 23 October 2007

Time:		2:00pm - 3:00pm

Venue:		Lecture Theatre F
		(Leung Yat Sing Lecture Theatre, near lift nos. 25/26)
		HKUST

Abstract:

Recent advances in computing and communication technology and
infrastructure have unleashed a new wave of innovations and applications
in multimedia distribution, consumption, and multimedia based interaction.
In this talk I will give an overview of my research in multimedia
computing and communication at Motorola Labs and then focused on the
problems in multi-access wireless video-on-demand applications.

Video traffic is different from data or voice traffics in the sense that
the traffic throughput is elastic but has stringent delivery deadlines.
Video adaptation techniques like transcoding and video summarization can
shape the video traffic profile in different ways with resulting
consequences in received QoS. On the other hand, the radio resources in
wireless system, like spectrum, power and time slots are still expensive,
and the network operators always want to operate the system at the best
resource efficiency possible.  In this work, we utilizes the video
summarization technique to achieve VLBR video traffic shaping, and
formulate the multi-access video-on-demand problem as a resource
constrained total utility maximization problem. A dual-decomposition based
resource pricing solution is found as the outer loop of control, that
couples with local adaptation at mobiles, to achieve high radio resource
efficiency and best QoS possible. Simulation results demonstrated the
effectiveness of this approach, and some extensions of the framework
proposed.


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Biography:

Zhu Li received his PhD in Electrical & Computer Engineering from
Northwestern University, Evanston in 2004. He has been with the Multimedia
Research Lab (MRL), Motorola Labs, since 2000, where he is a Principal
Staff Research Engineer. His research interests include manifold modeling
and machine learning in biometrics, multimedia analysis, retrieval and
mining, video coding and communication, game theory and optimization
decomposition techniques in multimedia networks and systems. He has 9
issued or pending patents, 30+ publications in book chapters, journals and
conference proceedings in these areas.

He is an IEEE member, a member of IEEE Multimedia Communication Technical
Committee (MMTC). He served as the Tech Program Co-Chair for IEEE Int'l
Workshop on Multimedia Analysis & Processing (IMAP), 2008, as co-chair for
"Wireless Multimedia Streaming and Networking" track of IEEE ICCCN, '07,
and as a guest co-editor for Journal of Advances in Multimedia (J-AM)
special issue on "Collaboration and Optimization in Multimedia
Communication". He has served as Technical Program Committee (TPC) members
for IEEE Int'l Symp. on Multimedia (ISM) '05, '06, IEEE Int'l Conf on
Communication (ICC)'06, '07, '08, IEEE Int'l Conf on Multimedia & Expo
(ICME)'06, '07, IEEE GLOBECOM '06, '07, '08, and SPIE Symp. on Multimedia
Systems and Applications, '07. He is also an active reviewer for journals
IEEE Trans. on Image Processing (T-IP), IEEE Trans. on Multimedia (T-MM),
IEEE Trans. on PAMI, IEEE Trans. on Circuits & Sys. for Video Tech
(T-CSVT), IEEE J-SAC, IEEE Comm. Magazine, and EURASIP Jnl. on Applied
Signal Processing.

He received the Best Poster Paper Award at IEEE Int'l Conf on Multimedia &
Expo (ICME), Toronto, 2006, and the DoCoMo Labs Innovative Paper Award
(Best Papaer) at IEEE Int'l Conf on Image Processing (ICIP), San Antonio,
2007. He is a marathon runner and triathlon enthusiast, finished 1 full
and 3 half-marathons, as well as 8 Olympic distance triathlon events.