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TU Berlin

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Dr.-Ing. Dragos Vingarzan

Fraunhofer FOKUS
Kaiserin-Augusta-Allee 31
10589 Berlin


He graduated at The "Politehnica" University of Bucharest in February 2005 with a Diploma Thesis on the subject of service triggering in IMS, with a practical prototype implementation. During the 5-year study at The Faculty of Automatic Control and Computers he followed the Computer Engineering program on base software, compilers and computer networks.


Between 1999 and 2004, he gained valuable hands-on experience as a full-time employee at various national ISP and Telecom Operators. During this period he acted as software analyst/developer as well as project development leader in various projects for network monitoring, provisioning, management, billing and VoIP deployments.

During 2004 he worked on his Diploma Thesis at Fraunhofer FOKUS (www.fokus.fraunhofer.de), which represented the first milestone of The Open IMS Playground (www.open-ims.org).

Since 2005 he is employed as a Scientific Researcher as the same institute, where he continued his work into the Open Source IMS Project (www.openimscore.org), as well into feasibility and performance studies on NGN architectures.

Since 2009 he has taken the leading role in the Reliable Network Infrastructures, which has the main target of providing solid, scalable and efficient core network infrastructure for Next Generation Fixed and Mobile Networks. As a senior researcher, he is leading a team of more than 10 scientists and students, which have continued the legacy of the OpenIMSCore, with a similar project, the Open Evolved Packet Core (www.openepc.net).

Currently he is working on his PhD study in the area of NGN testbeds and core networks, with special interests in prototyping, open source in telecommunications, performance benchmarking and interoperability. He is a published author and a member of various NGN, IMS and EPC working groups, actively participating in the standardization process.


PhD Study: "Open Source in NGN Telecommunication Test-beds – An iterative approach at running self-sustained open source projects as powerful NGN R&D infrastructure"

In the last decade, the Telecom world has taken a turn from the use of own domain proprietary technologies, towards unification with the Internet world concepts and technologies. This started as a prominent migration of the telephony services from legacy architectures to Voice-over-IP concepts and continues to date with the deep architectural migration of existing 2nd and 3rd Generation Radio Access Networks (GPRS/UMTS) to all-IP platforms, a Packet-Switched-only IP-based 4th Generation system (LTE) and even the acceptance of Internet world established wireless access solutions. The introduction of this Next Generation Network, besides the technical aspects, represents also a clash of standardization patterns, slowing down its adoption and deployment.

The motivation of the thesis is represented by the stringent requirement for the acceleration of NGN technologies adoption. From this arises the need for an open, extensible R&D infrastructure as a solution to the relatively slow convergence of the Telecom standards in an IP world. Open Source then has proven itself as an effective platform on all levels and domains, capable of providing solid platforms. The present thesis aims to formalize and present the process of establishing, running and exploiting Open Source projects in the NGN domain, towards satisfying the R&D infrastructural requirements. The thesis can then also serve as a blueprint for building innovation bridges between the academia and the industry through open source software. The model presented is financially self-sustainable and is iteratively improved.

The author has successfully driven the Open Source IP Multimedia Subsystem Core project (www.openimscore.org) through its life cycle. With lessons learned, a second project has been established, the Open Evolved Packet Core (www.openepc.net), with significantly higher resource investments, larger footprint and higher targets. The content gathered through 7 years of work in the field of Next Generation Networks contains a significant amount of insight into the evolution of current telecommunication networks towards the Next Generation Networks and Future Internet Services.


Besides several industry projects on NGN research, Dragos is currently working on several academic research projects. If you are interested in participating or if you are an AV student looking for a nice project that will provide you with C/Java hands-on experience, the best NGN components insight as well as work experience into internationally recognized Open Source projects, while also gaining university credit for your work, do not hesitate to contact him directly. The range of implemented prototypes by the team members span over the entire fixed and mobile network architectures, such that you will not only specialize into a field of high potential and demand, but you will also gain a good overall view on how the telecommunication core networks work. He is regularly guiding several students for AV projects as well as for Master Theses.

Diploma Thesis

Dragos Vingarzan, Dorgham Sisalem, Valentin Cristea; “A 3rdGeneration IP Multimedia Session Handling implementation into SIP Express Router”, “Politehnica” University of Bucharest, Diploma Thesis, 2005

Published Papers, Scientific Articles, Journal and Book Publications

Dragos Vingarzan, Peter Weik, Thomas Magedanz; „Design and Implementation of an Open IMS Core”, Mobility Aware Technologies and Applications Second International Workshop, MATA 2005, Montreal, Canada, October 17-19, 2005, Proceedings, Lecture Notes in Computer Science, Volume 3744/2005, pp. 284-293, Springer Berlin / Heidelberg


Dragos Vingarzan, Peter Weik; “End-to-end performance of the IP multimedia subsystem over various wireless networks", Wireless Communications and Networking Conference 2006, IEEE WCNC 2006, vol.1, no., pp.183-188, 3-6 April 2006

Dragos Vingarzan, Peter Weik, Thomas Magedanz; “Towards an Open Source IMS Core System Enabling Rapid prototyping of NGN Services”, 3rd International WORKSHOP on 'Next Generation Networking Middleware'(NGNM06) in the scope of Networking 2006 5th IFIP, TC6 Networking Conference; May 19, 2006; University of Coimbra,Coimbra, Portugal

Dragos Vingarzan, Peter Weik; “IMS Signaling over Current Wireless Networks: Experiments Using the Open IMS Core”, Vehicular Technology Magazine, IEEE , vol.2, no.1, pp.28-34, March 2007


George Din, Dragos Vingarzan, Peter Weik; „Leistungsvergleich von IMS", Fachzeitschrift funkschau, Edition 5/2007, March 16th, 2007, p. 44-46

  • ISSN 0016-2841

Dragos Vingarzan, Peter Weik, Thomas Magedanz; “Development of an open source IMS core for emerging IMS testbeds, the academia and beyond”, Journal of Mobile Multimedia, Volume 3, Issue 2, pp 131-149, June 2007, Rinton Press, Incorporated

Niklas Blum, Piotr Jacak, Florian Schreiner, Dragos Vingarzan, Peter Weik; “Towards Standardized and Automated Fault Management and Service Provisioning for NGNs”, Journal Of Network And Systems Management, Volume 16, Number 1, pp. 63-91, Springer New York


Thomas Magedanz, Peter Weik, Dragos Vingarzan, Fabricio Carvalho de Gouveia, Sebastian Wahle, “Experiences on the Establishment and Provisioning of NGN/IMS Testbeds - The FOKUS Open IMS Playground and the Related Open Source IMS Core”, 11th International Conference on Intelligence in Service Delivery Network 2007 (ICIN 2007), October 8th-11th 2007 Bordeaux, France


Peter Weik, Dragos Vingarzan; “The Open IMS Core - an Open Source Reference Implementation for the Telecommunications Industry", Design& Developers Forum at the 50th IEEE Global Communications Conference , Exhibition & Industry Forum (GLOBECOM), 26-30 November 2007, Washington D.C., USA

Peter Weik, Dragos Vingarzan, Thomas Magedanz; “The FOKUS Open IMS Core - A Global Reference Implementation”, Ahson, Syed A. (Ed.) et al.: IP Multimedia Subsystem (IMS) Handbook. Boca Raton, Fla. [u.a.]: CRC Press, 2009, pp. 113-132

Bogdan Harjoc, Florian Schreiner, Dragos Vingarzan, Thomas Magedanz; "Automated fault localization based on unified Web service and NGN benchmarking”, Computers and Communications, 2009. ISCC 2009. IEEE Symposium on, pp.77-82, 5-8 July 2009


Alberto Diez Albaladejo, Dragos Vingarzan, Peter Weik, Thomas Magedanz; “Digital inclusion opportunities in the telecommunications sector through NGN and open source tools: The open IMS core experience”, Innovations for Digital Inclusions, 2009. K-IDI 2009. ITU-T Kaleidoscope: , vol., no., pp.1-6, Aug. 31 2009-Sept. 1 2009


Marius Corici, Alberto Diez Albaladejo, Dragos Vingarzan, Thomas Magedanz, Cornel Pampu, Qing Zhou; “Enhanced access network discovery and selection in 3GPP Evolved Packet Core”, Local Computer Networks, 2009. LCN 2009. IEEE 34th Conference on , vol., no., pp.677-682, 20-23 Oct. 2009


Marius Corici, Fabricio Gouveia, Thomas Magedanz, Dragos Vingarzan; “OpenEPC: A Technical Infrastructure for Early Prototyping of NGMN Testbeds”, Testbeds and Research Infrastructures. Development of Networks and Communities 6th International ICST Conference, TridentCom 2010, Berlin, Germany, May 18-20, 2010, pp. 166-175, Revised Selected Papers, Springer Berlin Heidelberg


Marius Corici, Jens Fiedler, Thomas Magedanz, Dragos Vingarzan; “Access Network Discovery and Selection in the Future Broadband Wireless Environment”, Mobile Wireless Middleware, Operating Systems, and Applications, Third International Conference, Mobilware 2010, Chicago, IL, USA, June 30 - July 2, 2010, Volume 48, Part 2, pp. 70-83,  Revised Selected Papers, Springer Berlin Heidelberg


Marius Corici, Dragos Vingarzan, Thomas Magedanz; “3GPP Evolved Packet Core - the Mass Wireless Broadband all-IP architecture”, World Telecommunications Congress 2010, Vienna, Austria, August 2010; OVE GIT, ITG (Hrsg.), World Telecommunications Congress 2010 - WTC 2010, Telecommunications: The Infrastructure for the 21st Century, September 13-14, 2010 Vienna, Austria


Tran Quang Thanh, Dragos Vingarzan, Yacine Rebahi, Thomas Magedanz; “A Diameter based testing system in Next Generation Mobile Network”, Telecommunications Network Strategy and Planning Symposium (NETWORKS), 2010 14th International , vol., no., pp.1-5, 27-30 Sept. 2010

Marius Corici, Thomas Magedanz, Dragos Vingarzan, Peter Weik; “Prototyping mobile broadband applications with the open Evolved Packet Core”, Intelligence in Next Generation Networks (ICIN), 2010 14th International Conference on , pp.1-5, 11-14 Oct. 2010


Marius Corici, Jens Fiedler, Ancuta Onofrei, Dragos Vingarzan; “Enabling dynamic service delivery in the 3GPP Evolved Packet Core”, GLOBECOM Workshops (GC Wkshps), 2010 IEEE , pp.2012-2016, 6-10 Dec. 2010


Marius Corici, Thomas Magedanz, Dragos Vingarzan, Peter Weik; “Enabling Ambient Aware Service Delivery in Heterogeneous Wireless Environments”, GLOBECOM 2010, 2010 IEEE Global Telecommunications Conference, pp.1-6, 6-10 Dec. 2010


Marius Corici, Dragos Vingarzan, Thomas Magedanz, Cornel Pampu, Qing Zhou; “Access Network Reselection Based on Momentary Resources in a Converged Wireless Environment”, GLOBECOM 2010, 2010 IEEE Global Telecommunications Conference, pp.1-6, 6-10 Dec. 2010


Corici, Marius, Dragos Vingarzan, Thomas Magedanz, Cornel Pampu, and Qing Zhou: "Proactive Vertical  Handover Optimizations  in  the 3GPP Evolved Packet Core." In: Pentikousis, Kostas, Ramón  Agüero, Marta García-Arranz, Symeon Papavassiliou, Ozgur Akan, Paolo Bellavista, Jiannong Cao, Falko Dressler, Domenico Ferrari, Mario Gerla, Hisashi Kobayashi, Sergio Palazzo, Sartaj Sahni, Xuemin (Sherman) Shen, Mircea Stan, Jia Xiaohua, Albert Zomaya and Geoffrey Coulson (editors): Mobile Networks and Management, volume 68 of Lecture Notes of the Institute for Computer Sciences, Social Informatics and Telecommunications Engineering, pages 109–122. Springer Berlin Heidelberg, 2011.

  • ISBN 978-3-642-21443-1 (PRINT) 978-3-642-21444-8 (ONLINE)


Lajos Lange, Thomas Magedanz, Julius Müller, Daniel Nehls, Dragos Vingarzan; “Evolutionary future internet service platforms enabling seamless cross layer interoperability”, Internet Communications (BCFIC Riga), 2011 Baltic Congress on Future, pp.1-6, 16-18 Feb. 2011


Marius Corici, Jens Fiedler, Thomas Magedanz and Dragos Vingarzan; “Access Network Discovery and Selection in the Future Wireless Communication”; Journal Mobile Networks and Applications, Volume 16, Issue 3, pp. 337-349, June 2011, Springer Netherlands

Marius Corici, Dragos Vingarzan, Thomas Magedanz, Cornel Pampu, Qing Zhou; “Proactive Vertical Handover Optimizations in the 3GPP Evolved Packet Core”, Mobile Networks and Management, Second International ICST Conference, MONAMI 2010, Santander, Spain, September 22-24, 2010, pp. 109-122, Revised Selected Papers, Springer Berlin Heidelberg


Marius Corici, Ancuta Onofrei, Dragos Vingarzan, Julius Muelle, Thomas Magedanz; “Massive deployment of small coverage area cells in the all-IP wireless system - Opportunities, issues and solutions”, Telecom World (ITU WT), 2011 Technical Symposium at ITU, pp.147-152, 24-27 Oct. 2011


Julius Mueller, Thomas Magedanz, Marius Corici, Dragos Vingarzan; “UE & Network Initiated QoS Reservation in NGN and Beyond”, Network of the Future 2011, 2nd IFIP International Conference on, accepted for publication, 28-30 November 2011, Paris, France

Marius Corici, Jens Fiedler, Thomas Magedanz, Dragos Vingarzan; “Evolution of the Resource Reservation Mechanisms for Machine Type Communication Over Mobile Broadband Evolved Packet Core Architecture”, IEEE Workshop on Multimedia Communications (MMCOM) 2011, 5-9 December 2011, Huston, USA

Marius Corici, Jens Fiedler, Dragos Vingarzan, Thomas Magedanz; “Device Connectivity Management for Mobile All-IP Broadband Network Architecture”, 5th IEEE International Conference on Signal Processing and Communication Systems (ISCPSC11), IEEE CFP1190G-USB, 12 - 14 December 2011, Honolulu, Hawaii.

  • ISBN 978-1-4577-1178-7

Marius Corici, Jens Fiedler, Thomas Magedanz, Dragos Vingarzan; "Optimized Low Mobility Support in Massive Mobile Broadband Evolved Packet Core Architecture ", 17th IEEE International Conference on Networks (ICON2011),  IEEE: CFP11226-CDR, 14 - 16 December 2011, Singapore.

  • ISBN: 978-1-4577-1825-0

Corici, Marius, Dragos Vingarzan, Thomas Magedanz, Peter Weik, Nico Beyer, and Hans Einsiedler: "Connectivity  Support Harmonization in Future Internet Architecture." In: 16th International  Conference on Intelligence in Next Genera- tion Networks 2012 (ICIN 2012). (To Be Published). Berlin, Germany, October 2012. TBD.

Mueller, Julius, Yahya Al-Hazmi,  Mohammad Fal Sadikin, Dragos Vingarzan, and Thomas Magedanz: "Secure and Efficient  Validation  of Data Traffic Flows in  Fixed  and Mobile Networks." In:  The 15th ACM  International  Conference on Modeling, Analysis and Simulation  of Wireless  and Mobile Systems 2012 (MSWiM’12). (To Be Published). Paphos, Cyprus, ACM,  2012. TBD.

Contributions to Standards

Invited Conference Presentations

  • Dragos Vingarzan, Thomas Magedanz, “Towards Open Softswitching – Open Source IMS Core for Multi Access Multi Service Environments”,  IQPC Softswitching, October 24th-26th 2006 Berlin, https://kb.iqpc.co.uk/events/3116/topic/24
  • Dragos Vingarzan, Peter Weik, “Introducing the Open IMS Core – Technical Tutorial”, 2nd FOKUS International IMS Workshop, November 16th-17th 2006, Berlin, http://www.fokus.fraunhofer.de/en/fokus_events/ngni/ims_ws_06/index.html
  • Dragos Vingarzan, Thomas Magedanz, “Testing for IMS – Turning IMS into Reality”, Marcus Evans 2nd Annual IMS Implementation Strategies 2007, January 29th -31st  2007 Amsterdam, Netherlands
  • ETSI/TISPAN 6 – IMS/NGN Performance Benchmark - “An Intel Description and Prototype Results”, The 3GSM World Congress, February 12th-15th, Barcelona, Spain
  • Dragos Vingarzan, Peter Weik, “The Open IMS Core – Technical Tutorial”, 3rd FOKUS International IMS Workshop, November 15th-16th 2007, Berlin, http://www.fokus.fraunhofer.de/en/fokus_events/ngni/ims_ws_07/index.html
  • Dragos Vingarzan, Sebastian Wahle, Peter Weik, Thomas Magedanz, “Interoperability: How Does This Actually Work For IMS ? - Experiences From The Open IMS Playground”, IIR Telecoms IMS Global Congress 2007, December 2007, Amsterdam, Netherlands
  • Peter Weik, Dragos Vingarzan, “The Open IMS Core - A Reference Implementation for NGN Prototyping and Testing Tutorial”, 4th FOKUS International IMS Workshop, 06-07 November 2008, Berlin, http://www.fokus.fraunhofer.de/en/fokus_events/ngni/ims_ws_08/index.html
  • Thomas Magedanz, Alberto Diez, Marius Corici, Dragos Vingarzan; “Understanding Next Generation Mobile Network and Related Technologies - LTE, EPC and IMS”, 5th FOKUS International IMS Workshop, 11th of November 2009, Berlin, Germany, http://www.fokus.fraunhofer.de/en/fokus_events/ngni/ims_ws_09/index.html
  • Dragos Vingarzan, H. Moustafa, Eugen Mickoczy; Chairing the 2nd Open NGN and IMS Testbeds Workshop (ONIT), TRIDENTCOM 2010, 18th of May 2010, Berlin, Germany, http://www.onit-ws.org/2010/index.html
  • Marius Corici, Dragos Vingarzan, Thomas Magedanz;  “3GPP Evolved Packet Core- the Mass Wireless Broadband all-IP architecture”, World Telecommunications Congress 2010, WTC 2010, Vienna, Austria, Telecommunications: the infrastructure for the 21st century : proceedings. Berlin [u.a.]: VDE-Verlag, 2010, 1-6
  • Marius Corici, Thomas Magedanz, Dragos Vingarzan; “Tutorial:Towards the Wireless Future Internet - Understanding the role of future mobile broadband networks and the Evolved Packet Core”, International Conference on Testbeds and Research Infrastructures for the Development of Networks and Communities, Tridentcom '10, 17th of May 2010, Berlin, Germany, http://www.tridentcom.org/2010/
  • Dragos Vingarzan, Marius Corici; “Getting started with the OpenEPC and OpenIMSCore to set-up your own FUSECO Testbed”, 2nd FOKUS FUSECO Forum 2011, 17th of November 2011, http://www.fokus.fraunhofer.de/en/fokus_events/ngni/fuseco_forum_2011/index.html

Diploma Theses (as advisor)

  • Adrian-Daniel Popescu, Valentin Cristea, Thomas Magedanz, Dragos Vingarzan; “Presence Service in the IMS”, “Politehnica” University of Bucharest, Diploma Thesis, 2006
  • Florin Dinu, Thomas Magedanz, Dragos Vingarzan, Valentin Cristea; “Security Enhancements for IMS: Topology Hiding and HSS Based Diameter Messaging”, “Politehnica” University of Bucharest, Diploma Thesis, 2006
  • Bogdan Harjoc, Thomas Magedanz, Dragos Vingarzan, Valentin Cristea; “Benchmarking Tool for the IP Multimedia Subsystem”, “Politehnica” University of Bucharest, Diploma Thesis, 2007
  • Alexandru Ilie, Dragos Vingarzan (advisor), Valentin Cristea (advisor) ; “Deployment and Configuration Enablers for Next Generation Networks”, “Politehnica” University of Bucharest, Diploma Thesis, 2008
  • Umut Emin, Thomas Magedanz (advisor), Dragos Vingarzan (advisor); “Design and Implementation of MRF-Controller and MRF-Processor within an IMS Architecture”, Technische Universitaet Berlin, Diploma Thesis, 2008

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