Dr.-Ing. Amr Rizk


Phone: +49 (0) 6151 16 20850
Location: S3|20 222
E-Mail: Amr.Rizk@...

I was an Athene Young Investigator (Independent Research Group head) at the Department of Electrical Engineering and Information Technology at the TU Darmstadt until July 2019. From Feb. 2016 to July 2019 I was also head the Adaptive Overlay Communications group at KOM.

Previously, I was Post-Doctoral Researcher with the Department of Computer Science at the University of Warwick, U.K., and at the University of Massachusetts Amherst, USA. Currently, I am Juniorprofessor with the Faculty of Engineering, Computer Sciences and Psychology at Universität Ulm.

8 Private Questions (in german)

Research Interests

My research focus lies on stochastic modeling and optimization of networked service systems. To this end, I develop methods and techniques in the areas of Queuing Theory, Network Calculus and Probability. I apply these analytical tools for the design and quantitative analysis and control of various service systems such as communication networks, industrial processes, (general) storage systems, multimedia and IoT. Since 2016, I have been working on the optimization of adaptive communication systems within the collaborative research center MAKI. My work there is related to the application fields of Software-defined Networking, Multimedia and Caching. Recently, I have been also working on Blockchain based distributed applications.


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Selected Publications

  • B. Alt, T. Ballard, R. Steinmetz, H. Koeppl, and A. Rizk, “CBA: Contextual Quality Adaptation for Adaptive Bitrate Video Streaming,” IEEE INFOCOM – accepted full paper (2019)
  • A. Frömmgen, D. Stohr, B. Koldehofe, and A. Rizk, “Don’t Repeat Yourself: Seamless Execution and Analysis of Extensive Network Experiments,” ACM CoNEXT (2018)
  • W. R. KhudaBukhsh, B. Alt, S. Kar, A. Rizk, H. Koeppl: Collaborative Uploading in Heterogeneous Networks: Optimal and Adaptive Strategies. IEEE INFOCOM (2018)
  • D. Stohr, A. Frömmgen, A. Rizk, M. Zink, R. Steinmetz, W. Efelsberg: Where are the Sweet Spots? A Systematic Approach to Reproducible DASH Player Comparisons. ACM Multimedia (2017)
  • A. Frömmgen, A. Rizk, T. Erbshäußer, M. Weller, B. Koldehofe, A. Buchmann, R. Steinmetz: A Programming Model for Application-defined Multipath TCP Scheduling, ACM/IFIP/USENIX Middleware 2017 - Best paper award
  • W. R. KhudaBukhsh, A. Rizk, A. Frömmgen, H. Koeppl: Optimizing Stochastic Scheduling in Fork-Join Queuing Models: Bounds and Applications. IEEE INFOCOM (2017)
  • S. Subramanya, A. Rizk, D. E. Irwin: Transient Guarantees: Maximizing the Value of Idle Cloud Capacity. ACM SIGHPC Supercomputing (2016)
  • Z. Bozakov, A. Rizk, D. Bhat, M.Zink: Measurement-based Flow Characterization in Centrally Controlled Networks. IEEE INFOCOM (2016)
  • A. Rizk, F.  Poloczek, F. Ciucu: Computable Bounds in Fork-Join Queueing Systems. ACM SIGMETRICS (2015): 335-346
  • M. Fidler, A. Rizk: A Guide to the Stochastic Network Calculus. IEEE Communications Surveys and Tutorials 17(1): 92-105 (2015)


List of publications



Publications @ KOM

Research Projects

Current Projects as PI

Current Projects in my group (non-PI)

  • SFB MAKI - Personalized Video Composition and Distribution (Project C3), DFG
  • SENDATE  - Secure Networking for a Data Center Cloud in Europe (Planets), BMBF
  • E-Finance Lab at the House of Finance (Layer 1)

Previous Projects

  • Joint Power Saving Strategies for Mobile Stations and Multimedia Caches