Theoretische Grundlagen der Kommunikationstechnik

Invitation to a Talk by Dr. Stefan Valentin, Principal Researcher, Head of Context-Aware Optimization, Mathematical and Algorithmic Sciences Lab FRC, Huawei Technologies, Paris, France

Time22 September 2015, 10:00 AM  
LocationHFT - Hochfrequenztechnik building, 6th floor, Room HFT 617, Einsteinufer 25, 10587 Berlin  
TitleAnticipatory Video Streaming for Mobile Users  


Mobile video streaming is a rising business but poses significant challenges for network and service operators. In mobile networks, time-variant wireless channels often violate the content's rate requirement, which leads to poor streaming quality and wasted channel capacity. This tutorial will cover new techniques for anticipatory adaptation, which drastically improve this situation. By proactively adapting load and resource allocation to a prediction of the wireless channel state, the network assures smooth video streaming and utilizes the memory of mobile devices to increase spectral efficiency. Drive tests and simulation consistently show impressive gains in video quality or a very high increase in spectral efficiency when anticipatory resource allocation is applied. After presenting powerful heuristics, we will survey optimal formulations based on linear programming, quadratically constrained programming, and Markov decision processes. Channel prediction will be covered from the perspective of applying support vector machines and Bayesian spatio-temporal inference to radio maps. We will conclude with a vision for context and user-centric adaptation that could play a key role for providing truly seamless services in 5G.  



Stefan Valentin received an M.A. in EE with excellence from the Technical University of Berlin, Germany in 2004 and a Dr. rer. nat. in CS with summa cum laude from the University of Paderborn, Germany in 2010. In the same year, he joined Bell Labs, Stuttgart as a Member of Technical Staff, where he worked on wireless resource allocation algorithms for 4G and 5G. Recently, he moved to Paris to lead the Context-Aware Optimization team at Huawei’s new Math and Algorithms Lab. Dr Valentin’s research interests are wireless channel models, context-aware resource allocation, and anticipatory adaptation. His algorithms for Anticipatory DASH are deployed by a leading European operator since 2014. Dr Valentin received the Bell Labs Award for Exceptional Achievements in 2011, the Klaus Tschira Award for Comprehensible Science in 2011, and the Bell Labs Award of Excellence in 2013. In 2015, he received Huawei’s Award of Excellence, and the Fred W. Ellersick Prize of the IEEE Communications Society.