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Colloquia Series-Deep Medhi

Sep 21
11:00 a.m.
Lopata Hall, Room 101

Quality of Experience with Video and Immersive Content Delivery


Dynamic adaptive streaming over HTTP (DASH) based streaming is becoming the most popular online video streaming technique. DASH streaming provides seamless playback by adapting the video quality to the network conditions during the video playback. A DASH server supports adaptive streaming by hosting multiple representations of the video and each representation is divided into small segments of equal playback duration. At the client end, the video player uses an adaptive bitrate selection (ABR) algorithm to decide the bitrate to be selected for each segment depending on the current network conditions. Netflix currently uses DASH for movie viewing to end users.  In this talk, we will cover two aspects. In the first part, I’ll present a segment-aware rate adaptation (SARA) algorithm that considers the segment size variation in addition to the estimated path bandwidth and the current buffer occupancy to accurately predict the time required to download the next segment for better quality of experience (QoE). I'll also discuss its implementation on mobile clients and performance results. In the second part, I'll discuss emerging immersive contents (such as 360-degree video) that require a tile-based approach for QoE and its implication on contentions as multiple connections may be required, and how a software-defined networking approach using application-aware networking may be used to improve performance. Finally, I'll discuss theoretical issues with such applications that require multiple TCP connections that compete with typical web applications.


Deep Medhi is currently serving as Program Director in the Computer & Network Systems Division at NSF. He is Curators' Distinguished Professor in the Department of Computer Science and Electrical Engineering at the University of Missouri-Kansas City. He received B.Sc. in Mathematics from Cotton College, Gauhati University, India, M.Sc. in Mathematics from St. Stephen's College, University of Delhi, India, and his Ph.D. in Computer Sciences from the University of Wisconsin-Madison, USA.

Prior to joining UMKC in 1989, he was a member of the technical staff at AT&T Bell Laboratories.   He has published over 170 peer-reviewed papers, and is co-author of the books, "Routing, Flow, and Capacity Design in Communication and Computer Networks" (2004) and "Network Routing: Algorithms, Protocols, and Architectures" (1st edition,2007; 2nd edition 2017), both published by Morgan Kauffman/Elsevier. He is a Fellow of the Institute of Electrical and Electronics Engineers (IEEE).

Organizer / Host: Sanjoy Baruah