Globally, video streaming currently accounts for about 70% of all traffic on the internet and it is expected to reach 82% by 2021. Thus, managing video traffic efficiently is of high importance for many organizations. Furthermore, video communication is becoming an important and integral part of many applications, for example, for staff training or customer support calls. In recent years HTTP (Hypertext Transfer Protocol) adaptive streaming (HAS) is being adopted with increasing frequency and has become the de-facto standard for video streaming. However, the client-driven, on-off adaptation behavior of HAS results in uneven bandwidth competition and it is exacerbated when a large number of clients share the same bottleneck network link and compete for the available bandwidth. With HAS each client independently strives to maximize its individual share of the available bandwidth, which leads to bandwidth competition and a decrease in end-user quality of experience (QoE). The competition causes scalability issues, which are quality instability, unfair bandwidth sharing and network resource underutilization. In this talk I will present some of our proposals and recent work on a new software defined networking (SDN) based dynamic resource allocation and management architecture for HAS systems and a bitrate adaptation scheme that is based on game.
讲座人介绍：Roger Zimmermann is an Associate Professor with the Computer Science Department at the National University of Singapore (NUS). He is also a deputy director with the Smart Systems Institute (SSI) at NUS and was recently the co-director of the Centre of Social Media Innovations for Communities (COSMIC). He holds a Ph.D. and an M.S. degree in Computer Science from the University of Southern California (USC). Among his research interests are streaming media and AR/VR architectures, dynamic adaptive streaming over HTTP (DASH), software defined networking (SDN), applications of machine learning, mobile location-based services, and spatio-temporal information management. He has co-authored seven patents and more than two-hundred peer-reviewed articles in the aforementioned areas. He received the Best Paper Award at the IEEE International Symposium on Multimedia (ISM) 2012 and the ACM SIGSPATIAL International Workshop on GeoStreaming (IWGS) 2016. Dr. Zimmermann is on the editorial boards of the IEEE Multimedia Communications Technical Committee (MMTC) Review Board and the Springer International Journal of Multimedia Tools and Applications (MTAP). He is also an associate editor with the ACM Transactions on Multimedia journal (ACM TOMM) and IEEE MultiMedia. He was Secretary of ACM SIGSPATIAL from 1 July 2014 to 30 June 2017. He has served on the conference program committees of many leading conferences and as reviewer of many journals. Recently he was the general chair of the ACM Multimedia Systems 2014 and the IEEE ISM 2015 conferences, and TPC co-chair of the ACM TVX 2017 conference. He is a Senior Member of the IEEE and a Distinguished Member of the ACM. Further details can be found on his website at http://www.comp.nus.edu.sg/~rogerz.
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