Seminar Series

Network Virtualization and performance issues


Prof. Phuoc Tran-Gia and Valentin Burger


The University of Wuerzburg, Germany

Time & Place

Fri, 02 Dec 2016 11:00:00 NZDT in Erskine 315.


The rapid development of content distribution and the way the internet is used today has led to the need for new technologies to handle the ever growing demand of current and next generation networks. This need was followed by the concepts of Software Defined Networking (SDN) and Network Function Virtualization (NFV). Both of these concepts aim to improve flexibility as well as maintainability of computer networks that become more and more complex every day. Thereby, the SDN paradigm aims to separate control and dataplane by moving the logic of network operation to a dedicated controller while the forwarding is handled by whitebox switches. The goal of NFV on the other hand is to replace entire network appliances commonly realized through dedicated specialized hardware boxes by scalable and easy to maintain software solutions. The first part of the presentation will introduce the two concepts SDN and NFV and will outline current research in this area. The network functions enabling content distribution are caches which are placed in or close to access networks to serve content with low latency and few hops to save resources. A cache has a limited capacity to store content, which means that content items stored on the cache need to be evicted if newly requested items have to be stored in the cache. The second part of the presentation will show performance issues of caches and present methods based on a decoupling technique to analyse the performance of isolated and interconnected caches for different caching policies and systems


Phuoc Tran-Gia is professor and director of the Chair of Communication Networks, University of Würzburg, Germany. He has adjunct professorships at the University of Canterbury, Christchurch and at the Royal Melbourne Institute of Technology (RMIT). Since October 2015 Prof. Tran-Gia is Vice President of the University of Würzburg, being responsible for internationalization, alumni, information technology, and public relations. Prof. Tran-Gia is also member of the Advisory Board of Infosim (Germany) specialized in IP network management products and services and co-founder and board member of Weblabcenter Inc. (Dallas, Texas), specialized in Crowdsourcing technologies. Prof. Tran-Gia was coordinator of the German-wide G-Lab Project `National Platform for Future Internet Studies' aiming to foster experimentally driven research to exploit future Internet technologies. His current research areas include architecture and performance analysis of communication systems, and planning and optimization of communication networks. He has published more than 100 research papers on major conferences and journals, and recently received the Fred W. Ellersick Prize 2013 (IEEE Communications Society), the Arne Jensen Lifetime Achievement Award (International Teletraffic Congress) and the Robert Piloty Medal (The Technical University of Darmstadt). 
Valentin Burger studied at the University of Würzburg and received his diploma degree in computer science in 2011. During the diploma thesis, he was working on QoE models and monitoring of voice applications. Since then he is a research assistant at the Chair of Communication Networks at the University of Würzburg. His current research focus is on analytic and simulative performance evaluation of caching systems in content centric networks and the utilization of edge resources.