Lehrstuhl für Informatik IIIAm Hubland
Multi-Objective Optimization in Softwarized Networks
One of my main research topics revolves around placement problems in the area of softwarized networks, in particular Software Defined Networking (SDN) and Network Functions Virtualization (NFV). In this context, goals include the minimization of operators' capital as well as operational expenditures while maintaining a high level of customer satisfaction. Furthermore, research on decision making algorithms enables automation and adaptability to dynamically changing environments.
My skillset also includes the design, development, and deployment of suitable measurement setups alongside the choice of relevant performance indicators and metrics for quantifying evaluation results. This allows answering a multitude of technical and business-related questions, e.g., whether it is feasible to migrate from a dedicated hardware firewall to a softwarized firewall.
Finally, expertise in the area of system modeling allows devising abstract models that can be used for performance prediction of technical systems and the optimization of their parameters. In a recent publication from our working group, we accurately model a softwarized mobile gateway, enabling operators to assess its feasibility given the traffic characteristics of their specific environment.
I participate in the BMBF-funded Celctic project "SENDATE-PLANETS" (Secure Networking for a Data Center Cloud in Europe, ProgrammabLe Architecture for distributed NETworks) which deals with the challenges of secure distributed cloud architectures. In this project, my main focus is on the placement and performance evaluation of Virtualized Network Functions (VNFs). More details are available on the project homepage.
Furthermore, I am involved in the IKT project "SDN-Perf" which focuses on interaction mechanisms between Network Management Systems (NMSs) and SDN components. In this context, we're interested in the trade-offs that result from such an interaction with respect to possible performance gains on the one hand and increasing complexity of the architecture and implementations as well as communication overhead on the other hand. More details are available on the project homepage.
L. Linguaglossa, S. Lange, S. Pontarelli, G. Rétvári, D. Rossi, T. Zinner, R. Bifulco, M. Jarschel, and G. Bianchi:
"Survey of Performance Acceleration Techniques for Network Function Virtualization," to appear in Proceedings of the IEEE, 2018.
S. Lange, L. Reinhart, T. Zinner, D. Hock, N. Gray, and P. Tran-Gia:
"Integrating Network Management Information into the SDN Control Plane," in IEEE/IFIP Network Operations and Management Symposium (NOMS), 2018.
S. Lange, A. Grigorjew, T. Zinner, P. Tran-Gia, and M. Jarschel:
"A Multi-Objective Heuristic for the Optimization of Virtual Network Function Chain Placement," in International Teletraffic Congress (ITC), 2017.
S. Lange, S. Gebert, T. Zinner, P. Tran-Gia, D. Hock, M. Jarschel, and M. Hoffmann:
"Heuristic Approaches to the Controller Placement Problem in Large Scale SDN Networks," in IEEE Transactions on Network and Service Management (TNSM), 2015.
S. Lange, S. Gebert, J. Spoerhase, P. Rygielski, T. Zinner, S. Kounev, and P. Tran-Gia:
"Specialized Heuristics for the Controller Placement Problem in Large Scale SDN Networks," in International Teletraffic Congress (ITC), 2015.
S. Lange, A. Nguyen-Ngoc, S. Gebert, T. Zinner, M. Jarschel, A. Koepsel, M. Sune, D. Raumer, S. Gallenmüller, G. Carle, and P. Tran-Gia:
"Performance Benchmarking of a Software-based LTE SGW," in International Conference on Network and Service Management (CNSM), 2015.
T. Zinner, S. Geissler, S. Lange, S. Gebert, M. Seufert, and P. Tran-Gia:
"A Discrete-Time Model for Optimizing the Processing Time of Virtualized Network Functions," in Computer Networks, 2017.
For a full list of publications as well as download links for author versions, please visit the Publications page.