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Eirini Liotou

Department of Informatics and Telematics · Harokopio University · 9, Omirou Str., 177 78, Tavros, Athens, Greece
eliotou@hua.gr

My name is Eirini Liotou and I am an Assistant Professor at the Department of Informatics & Telematics,
Harokopio University of Athens.

Short bio

I hold a PhD degree from the Department of Informatics and Telecommunications, National and Kapodistrian University of Athens since 2017. I obtained the MSc in Informatics and Telecommunications from the National and Kapodistrian University of Athens (2011) and the MSc in Communications and Signal Processing from the Imperial College of London (2012). I received the Diploma in Electrical and Computer Engineering from the National Technical University of Athens (2006). Between 2017-2021 I was working as a Post-Doc researcher in the Communication Networks Laboratory of the Department of Informatics and Telecommunications in the National and Kapodistrian University of Athens. I have worked as Software Engineer in Siemens AG and as Senior Software Engineer in Siemens Enterprise Communications in the R&D department for the SME business sector, where I had joined the UC Call Processing team involved in the development activities in the areas of call control features, VoIP signaling protocols and UI programming of high-end telephones. Between 2021-2023, I have been working as a Project Manager / Senior Researcher for EU Research Projects at the I-SENSE group of the Institute of Communications and Computer Systems (ICCS), serving as Deputy Project Coordinator of EU projects (5G-IANA, XGain). I have authored more than 25 peer-reviewed publications in conferences and high-impact journals, while I have served as Technical Program Committee member and Technical Reviewer in flagship IEEE conferences and international journals. During my PhD, I have visited Vodafone R&D Technology, UK, and the University of Duisburg-Essen, Germany. I have participated in various EU projects (CROSSFIRE, SMART-NRG, CASPER, etc.), national projects (RECENT, CityZen, etc.) and COST actions (QUALINET, ACROSS, IRACON). I have also served as Adjunct Teaching Staff at the National and Kapodistrian University of Athens (2013-21), Hellenic Open University (2020-21), and Business College of Athens (2015-16). I also serve as a Reviewer for EU projects (as an EC expert).
My main research interests revolve around 5G mobile cellular networks, with a particular focus on:

  • Software-Defined Networking (SDN)
  • Networks Functions Virtualization (NFV)
  • Management and Orchestration (MANO)
  • Vertical Application Enabling Architectures (SEAL, CAPIF, NEF)
  • Device-to-Device (D2D) communications
  • Quality of Experience (QoE)
  • Radio Resource Management
  • HTTP Adaptive Video Streaming
  • Federated Learning
  • Cooperative, connected and automated mobility (CCAM)
Currently, I am an Assistant Professor at the Department of Informatics and Telematics, Harokopio University.

Education

Post Doc, User-centric network and service management for immersive applications, 2019-2021
Scholarship for Post-doc research from the State Scholarship Foundation ("ΙΚΥ")
Department of Informatics & Telecommunications
NATIONAL & KAPODISTRIAN UNIVERSITY OF ATHENS

PhD, Quality of experience characterization and provisioning in mobile cellular networks, 2017
Department of Informatics & Telecommunications
NATIONAL & KAPODISTRIAN UNIVERSITY OF ATHENS
PhD thesis available here

MSc. in Communications & Signal Processing, 2012
Department of Electrical & Electronic Engineering
IMPERIAL COLLEGE LONDON
Dissertation: "A cognitive packet protocol for opportunistic communications" available here

MSc. in New Technologies of Informatics & Telecommunications, 2011
Department of Informatics & Telecommunications
NATIONAL & KAPODISTRIAN UNIVERSITY OF ATHENS
Dissertation: "A graph coloring based secondary resource allocation for spatial spectrum reuse" available here

Diploma in Electrical & Computer Engineering (MEng equivalent), 2006
Department of Electrical & Computer Engineering
NATIONAL TECHNICAL UNIVERSITY OF ATHENS
Dissertation: "Study and measurement of the interferences caused by the aeronautical mobile satellite networks to the fixed microwave network" available here

Publications

Journal papers

1. E. Liotou, D. Tsolkas, N. Passas, and L. Merakos, “Quality of Experience management in mobile cellular networks: Key issues and design challenges,” IEEE Communications Magazine, Network & Service Management Series, vol. 53, no. 7, pp. 145-153, July 2015. (Impact Factor: 9.27)

2. D. C. Mocanu, J. Pokhrel, J. P. Garella, J. Seppӓnen, E. Liotou, and M. Narwaria, “No-reference video quality measurement: Added value of machine learning,” Journal of Electronic Imaging, vol. 24, no. 6, December 2015. (Impact factor: 0.816)

3. F. Metzger, E. Liotou, C. Moldovan, and T. Hoßfeld, “TCP video streaming and mobile networks: Not a love story, but better with context,” Elsevier Computer Networks, Special Issue on “Traffic and Performance in the Big Data Era,” vol. 109, pp. 246-256, November 2016. (Impact Factor: 2.522)

4. D. Tsolkas, E. Liotou, N. Passas, and L. Merakos, “A survey on parametric QoE estimation for popular services,” Elsevier Journal of Network and Computer Applications, vol. 77, pp. 1-17, January 2017. (Impact Factor: 3.991)

5. E. Liotou, K. Samdanis, E. Pateromichelakis, N. Passas, and L. Merakos, “QoE-SDN APP: A rate-guided QoE-aware SDN-APP for HTTP adaptive video streaming,” IEEE Journal on Selected Areas in Communications, Series on Network Softwarization & Enablers, vol. 36, no. 3, pp. 598-615, March 2018. (Impact Factor: 7.172)

6. E. Liotou, D. Tsolkas, G. Kalpaktsoglou, S. Tennina, L. Pomante, and N. Passas, "The CASPER user-centric approach for advanced service provisioning in mobile networks," Elsevier Microprocessors and Microsystems, vol. 77, September 2020.

7. K. V. Katsaros, E. Liotou, F. Moscatelli, T. Rokkas, G. Drainakis, E. Bonetto, D. Brevi, D. Klonidis, I. Neokosmidis, and A. Amditis, "Enabling far-edge intelligent services with NetApps: the Automotive Case," IEEE Internet of Things Magazine - Network Application Software for Vertical IoT Industry special issue, December 2022.

8. E. Liotou, D. Xenakis, V. Georgara, G. Kourouniotis, and L. Merakos, "Cache-enabled adaptive video streaming: A QoE-based evaluation study", MPDI Future Internet, Quality of Experience (QoE) Management in Softwarized Network Environments special issue, June 2023.

9. N. Baganal-Krishna, R. Lubben, E. Liotou, K. Katsaros, A. Rizk, “A Federated Learning Approach to QoS Forecasting in Cellular Vehicular Communications: Approaches and Empirical Evidence”, Elsevier Computer Networks, February 2023.

Conference proceedings

1. D. Tsolkas, E. Liotou, N. Passas, and L. Merakos, “A graph-coloring secondary resource allocation for D2D communications in LTE networks,” 17th International Workshop on Computer Aided Modeling and Design of Communication Links and Networks (IEEE CAMAD), Barcelona, Spain, September 2012.

2. D. Tsolkas, E. Liotou, N. Passas, and L. Merakos, “Enabling D2D communications in LTE networks,” 24th International Symposium on Personal, Indoor and Mobile Radio Communications (IEEE PIMRC), London, United Kingdom, September 2013.

3. E. Liotou, E. Papadomichelakis, N. Passas, and L. Merakos, “Quality of Experience-centric management in LTE-A mobile networks: The Device-to-Device communication paradigm,” 6th International Workshop on Quality of Multimedia Experience (IEEE QoMEX), Singapore, September 2014.

4. E. Liotou, D. Tsolkas, N. Passas, and L. Merakos, “Ant Colony Optimization for resource sharing among D2D communications,” 19th International Workshop on Computer Aided Modeling and Design of Communication Links and Networks (IEEE CAMAD), Athens, Greece, December 2014.

5. E. Liotou, G. Tseliou, K. Samdanis, D. Tsolkas, F. Adelantado, and C. Verikoukis, “An SDN QoE-Service for dynamically enhancing the performance of OTT applications,” 7th International Workshop on Quality of Multimedia Experience (IEEE QoMEX), Costa Navarino, Greece, May 2015.

6. E. Liotou, H. Elshaer, R. Schatz, R. Irmer, M. Dohler, N. Passas, and L. Merakos, “Shaping QoE in the 5G ecosystem,” 7th International Workshop on Quality of Multimedia Experience (IEEE QoMEX), Costa Navarino, Greece, May 2015.

7. D. Tsolkas, E. Liotou, N. Passas, and L. Merakos, “Addressing traffic demanding scenarios in cellular networks through QoE-based rate adaptation,” 26th International Symposium on Personal, Indoor and Mobile Radio Communications (IEEE PIMRC), Hong Kong, China, August 2015.

8. E. Liotou, T. Hoßfeld, C. Moldovan, F. Metzger, D. Tsolkas, and N. Passas, “Enriching HTTP adaptive streaming with context awareness: A tunnel case study,” International Conference of Communications (IEEE ICC), Kuala Lumpur, Malaysia, May 2016.

9. E. Liotou, D. Tsolkas, and N. Passas, “A roadmap on QoE metrics and models,” 23rd International Conference of Telecommunications (IEEE ICT), Thessaloniki, Greece, May 2016.

10. E. Liotou, D. Tsolkas, K. Samdanis, N. Passas, and L. Merakos, “Towards Quality of Experience management in the next generation of mobile networks,” 25th European Conference on Networks and Communications (EuCNC), Athens, Greece, June 2016.

11. E. Liotou, R. Schatz, A. Sackl, P. Casas, D. Tsolkas, N. Passas, and L. Merakos, “The beauty of consistency in radio-scheduling decisions,” 59th Global Communications Conference (IEEE Globecom Wkshps) - International Workshop on Quality of Experience for Multimedia Communications (QoEMC), Washington, DC, USA, December 2016.

12. E. Liotou, A. Sfikopoulos, P. Kaltzias, and V. Tsolkas, “An evaluation of buffer- and rate-based HTTP adaptive streaming strategies,” 22nd International Workshop on Computer Aided Modelling and Design of Communication Links and Networks (IEEE CAMAD), Lund, Sweden, June 2017.

13. S. Tennina, I. Tunaru, G. Karopoulos, D. Xenakis, E. Liotou, and N. Passas, “Secure energy management in smart energy networks,” 22nd International Workshop on Computer Aided Modelling and Design of Communication Links and Networks (IEEE CAMAD), Lund, Sweden, June 2017.

14. E. Liotou, A. Marotta, L. Pomante, and K. Ramantas, “A middleware architecture for QoE provisioning in mobile networks,” 22nd International Workshop on Computer Aided Modelling and Design of Communication Links and Networks (IEEE CAMAD), Lund, Sweden, June 2017.

15. M.-E. Xezonaki, E. Liotou, N. Passas, and L. Merakos, “An SDN QoE monitoring framework for VoIP and video applications,” 19th International Symposium on a World of Wireless, Mobile and Multimedia Networks (IEEE WoWMoM), Chania, Greece, June 2018.

16. E. Liotou, D. Tsolkas, S. Tennina, L. Pomante, G. Kalpaktsoglou, and N. Passas, “The CASPER project approach towards user-centric mobile networks,” Euromicro Conference on Digital System Design (DSD), Chalkidiki, Greece, August 2019.

17. E. Liotou, K. Chatzieleftheriou, G. Christodoulou, N. Passas, and L. Merakos, "Emulation of HTTP Adaptive Video Streaming over SDN," IEEE International Mediterranean Conference on Communications and Networking (Meditcom), Athens, Greece, September 2021.

18. E. Liotou, A. Alexiou, N. Passas, and L. Merakos, "QoE-centric implementation of SDN platform for Open-Flow-based network path selection," IEEE International Mediterranean Conference on Communications and Networking (Meditcom), Athens, Greece, September 2021.

19. F. Moscatelli, T. Xirofotos, A. Rizk, N. Baganal-Krishna, E. Bonetto, E. Liotou, and A. Amditis, "The 5G-IANA platform: Bringing far-edge resources and ML potential to the disposal of automotive third parties," IEEE Future Networks World Forum (FNWF), Montreal, Canada, October 2022.

20. G. Rizzo, E. Liotou, Y. Maret, J.-F. Wagen, T. Zugno, M. Wu, and A. Kliks, "Towards AI-Native Vehicular Communications," VTC-Spring2023, Florence, June 2023.

21. E. Liotou, D. Klonidis, M. Andolfi, P. Schmitting, E. Bonetto, M. Wimmer, K. Katsaros, C. Ververidis, "The 5G-IANA Automotive Open Experimentation Platform: Features and Assets at the Disposal of Third Parties,"IEEE Future Networks World Forum (FNWF), Baltimore, November 2023.

22. G. Scivoletto, M. Andolfi, E. Liotou, K. Katsaros, F. Princiotto, E. Bonetto, D. Brevi, T. Xirofotos, G. Landi, M. Fuentes, M. Ortiz, R. Horvath, M. Wimmer, “Development & Reliable Orchestration of Network Applications for the Automotive Domain Across the Edge-To-Cloud Continuum”, EuCNC & 6G Summit, Antwerp, June 2024.

Book chapters / Lecture Notes in Computer Science

1. D. Tsolkas, E. Liotou, N. Passas, and L. Merakos, “LTE-A access, core, and protocol architecture for D2D communication,” Smart Device to Smart Device Communication, Springer International Publishing, Editors: S. Mumtaz and J. Rodriguez, ISBN: 978-3-319-04963-2, pp. 23-40, April 2014.

2. D. Tsolkas, E. Liotou, N. Passas, and L. Merakos, “The need for QoE-driven interference management in femtocell-overlaid cellular networks,” Mobile and Ubiquitous Systems: Computing, Networking, and Services, Springer International Publishing, Editors: I. Stojmenovic, Z. Cheng, and S. Guo, ISBN: 978-3-319-11569-6, vol. 131, pp. 588-601, September 2014 (Mobiquitous, Tokyo, Japan, December 2013).

3. F. Metzger, T. Hoßfeld, L. Skorin-Kapov, Y. Haddad, E. Liotou, P. Pocta, H. Melvin, V. Siris, A. Zgank, and M. Jarschel, “Context monitoring for improved system performance and QoE,” Autonomous Control for a Reliable Internet of Services: Methods, Models, Approaches, Techniques, Algorithms and Tools, Springer International Publishing, Editors: I. Ganchev, R. van der Mei, and J. L. van den Berg, ISBN: 978-3-319-90415-3, vol. 10768, pp. 23-48, May 2018.

4. R. Schatz, S. Schwarzmann, T. Zinner, O. Dobrijevic, E. Liotou, P. Pocta, S. Barakovic, J. Barakovic Husic, and L. Skorin-Kapov, “QoE management for future networks,” Autonomous Control for a Reliable Internet of Services: Methods, Models, Approaches, Techniques, Algorithms and Tools, Springer International Publishing, Editors: I. Ganchev, R. van der Mei, and J. L. van den Berg, ISBN: 978-3-319-90415-3, vol. 10768, pp. 49-80, May 2018.

5. E. Liotou, T. Hoßfeld, C. Moldovan, F. Metzger, D. Tsolkas, and N. Passas, "The value of context-awareness in bandwidth-challenging HTTP Adaptive Streaming scenarios,” Autonomous Control for a Reliable Internet of Services: Methods, Models, Approaches, Techniques, Algorithms and Tools, Springer International Publishing, Editors: I. Ganchev, R. van der Mei, and J. L. van den Berg, ISBN: 978-3-319-90415-3, vol. 10768, pp. 128-150, May 2018.

Other publications

1. E. Liotou, N. Passas, and L. Merakos, “Towards QoE provisioning in next generation cellular networks,” IEEE Communications Society, Multimedia Communications Technical Committee E-Letter, Special Issue on “QoE Management for Next Generation Multimedia Services”, vol. 10, no. 3, May 2015 (invited article).

2. E. Liotou, N. Passas, and L. Merakos, “The emergence of experience packages in the 5G era,” IEEE 5G Tech Focus, vol. 1, no. 3, September 2017 September 2017 (editor-reviewed).

Courses

Internet Technologies, 5th semester

  • Introduction to Computer Networks and the Internet: Internet principles and architecture, basic network performance metrics (types of delay, packet loss, throughput, etc.), packet and circuit switching, protocol layers, encapsulation, network security basics
  • Application layer: Principles of network applications, web architecture, HTTP protocol, FTP, web caching, cookies, e-mail (SMTP, POP3, IMAP), Domain Name System (DNS), P2P file sharing
  • Quality of Experience (QoE): Quality of Service and Experience, Internet service evaluation models, network management systems based on QoE
  • Multimedia Networking: Multimedia Network Applications, UDP streaming, HTTP adaptive streaming, Peer-to-Peer file distribution, Content Distribution Networks (CDN), DASH, NetFlix, YouTube, Voice over IP (VoIP), SIP, RTP protocols, multiple classes of service, unified and differentiated services (Diffserv, IntServ), QoS, Resource Reservation Protocol (RSVP)


Management of Software Defined Networks, 8th semester

  • Wireshark lab (hands on protocols): HTTP, DNS, ICMP, ARP, IP, DHCP, ΝΑΤ
  • Mininet (SDN) lab: POX SDN controller, Open VSwitch, Ryu Controller, MiniNAM

Projects (most recent)

  • September 2021 – now: Deputy Project Coordinator for H2020-ICT41 (5G PPP Phase 3.VI) “5G-IANA” (5G Intelligent Automotive Network Applications)

  • July 2022 – now: Deputy Project Coordinator for HORIZON-CL6-2021-COMMUNITIES-01 Project “XGain” (Enhancing Competitiveness, Resilience and Sustainability of Remote Farming, Forestry and Rural Areas through Holistic Assessment of Smart XG, Last-mile and Edge Solutions’ Gains)

  • September 2018 – October 2019: Experienced researcher for Horizon2020 Marie Curie RISE project “CASPER” (user-Centric middleware Architecture for advanced Service Provisioning in futurE netwoRks)

  • August 2018 – April 2019: Senior researcher for FP7 Marie Curie “CROSSFIRE” (unCooRdinated netwOrk StrategieS for enhanced interFerence, mobIlity, radio Resource, and Energy saving management in LTE-Advanced networks)

  • December 2017 – July 2018: Senior researcher for FP7 Marie Curie IAPP “SMART-NRG” (InduStry-acadeMia pArtnership for the design and implementation of an efficient, Reliable and secure smarT eNeRGy network)

Contact