Events Calendar

EE Seminar: Achieving Ultra-High Reliability for Emerging Applications in Future Wireless Systems

Speaker: Dr. Meryem Simsek, TU Dresden, Germany and ICSI Berkeley

Talk Title: Achieving Ultra-High Reliability for Emerging Applications in Future Wireless Systems

Abstract: Wireless communication systems have been evolving since the first generation. With the fifth generation (5G) of wireless systems, the focus is not only on the evolutionary aspect of increased data rate, but also on novel performance metrics for emerging applications, such as autonomous driving, industrial automation, and Tactile Internet applications. In this context, the wireless system design has increasingly turned its focus on guaranteeing extremely high reliability and low latency. Hence, the developments of 5G systems require leveraging novel techniques to cope with the heterogeneity of applications and to achieve their stringent requirements.

This talk focuses on the definition of reliability in wireless systems and on fundamental techniques to achieve reliability requirements in 5G networks. Firstly, definitions and concepts of reliability theory, which provides a mathematical tool to evaluate and improve the reliability and availability of technical components and systems, are applied and extended to wireless networks. Then, the signal-to-interference-plus-noise ratio (SINR) is identified as a major metric to study the impact of the wireless link quality on high availability. For addressing new requirements imposed on emerging 5G applications, e.g. outage probabilities of 10-7 or less, a highly accurate modelling of the SINR is needed. A stochastic model of the SINR including the shadow fading, noise power, and best server policy is presented as an alternative to highly complex wireless system simulations providing extreme accuracy and a tool to evaluate the outage probability at any position in any given wireless network. As diversity techniques, such as multi-point connectivity which are also supported by the 5G systems, are widely accepted to be key to achieve high reliability, the proposed SINR model is extended to multi-point transmission. Numerical evaluations reveal the applicability of the model to multi-point connectivity. However, unlike the general understanding, it will be shown that ensuring low outage probabilities does not necessarily imply improved reliability in multi-user systems, in which resources are shared. In this regard, a novel matching theory-based algorithm aiming for guaranteeing reliability requirements in a multi-cellular, multi-user system will be presented. The proposed algorithm yields a maximum gain of 150% as compared to fixed multi-point approaches. The talk will be concluded with a research vision for how the results obtained so far can be extended to design highly flexible and autonomous tools for investigating future wireless systems, which simultaneously support multiple services with diverse requirements. These tools will open the new era for studying the feasibility of emerging applications under given conditions and the coexistence of various use cases with diverse and (partially) competing requirements, for developing novel concepts and end-to-end solutions for intelligent and predictive resource management in wireless systems, and for applying and implementing these concepts and solutions into real systems.

Biography: Meryem Simsek is a Principal Investigator at the International Computer Science Institute Berkeley and a senior Research Group Leader at the Technical University Dresden. She earned her Dipl.-Ing. degree in Electrical Engineering and Information Technology and her Ph.D. on "Learning-Based Techniques for Intercell-Interference Coordination in LTE-Advanced Heterogeneous Networks" from the University of Duisburg-Essen, Germany in 2008 and 2013, respectively. Her current research focuses on modelling and optimizing emerging wireless systems, heterogeneous wireless networks, achieving high reliability and low latency in 5G networks and Tactile Internet applications. Further research interests are based on developing novel tools for network management, wireless edge automation, and autonomous wireless networks and implementing these tools into real systems. She is the recipient of the fellowships by the German Physical Society (2004-2005) and the German National Academic Foundation, which is only granted to the outstanding 0.5% students in Germany (2004-2008). She holds the titles of the first electrical engineering student who has graduated before the regular duration of study and the best Diplom-graduate in Electrical Engineering at the University of Duisburg-Essen (2008). Meryem Simsek received the IEEE Communications Society Fred W. Ellersick Prize 2015 for IEEE Communications Magazine paper "When Cellular Meets WiFi in Wireless Small Cell Networks". In addition, she has initiated and is chairing the IEEE Tactile Internet Technical Committee and is serving as the secretary of the IEEE P1918.1 standardization working group, which she has co-initiated. She is also holding the position of the "industry and student activities coordinator" in the IEEE Women in Communications Engineering (WICE) committee.

Host: Andreas Molisch, molisch@usc.edu, x04670

Location: Hughes Aircraft Electrical Engineering Center (EEB) - 132

Audiences: Everyone Is Invited

Contact: Mayumi Thrasher