EWSDN 2014

Third European Workshop on Software Defined Networks (EWSDN) 2014
1-3 September 2014
Budapest, Hungary

Welcome message

Message from the General Chair

The organizing committee is delighted to welcome you to the Third European Workshop on Software Defined Networks in Budapest, Hungary, from 1-3 September 2014.

Software Defined Networking is undoubtedly one of the chief trends in the ICT area. Standardization is actively ongoing in the Open Networking Forum (ONF), the Internet Engineering Task Force (IETF) (e.g., I2RS, freshly formed Service Function Chaining (SFC) workgroup or recent initiatives to form VNFPool), while the European Telecommunications Standards Institute (ETSI) just released several group specifications on Network Functions Virtualization (NFV). On top of the several existing open-source SDN controllers, OpenDaylight reached significant momentum last year and arrived to its first official release in February 2014.

Despite the hype, the majority of the presentations and press releases from industry still are on the level of proofs of concept, and a number of architectural issues still have to be solved before a widespread introduction of SDN and NFV. EWSDN took this into account and added this year for the first time a demo and poster session, which reflects the increasing maturity of SDN, while still discussing architectural options in the paper sessions. In addition, we added two tutorials, one organized by and presenting results of the ALIEN FP7 EU project, and one hands-on tutorial that deals with the practical issue of migrating to SDN in existing networks.

We also welcome the co-located workshop of the 2nd EU-China workshop within the FIRE initiative. One goal of the workshop is to bring together industry and academia on the topics of SDN; in particular the workshop will feature a number of keynotes from industry.

We hope to continue the lively discussions we had during the first two editions of EWSDN here in Budapest. Have fun!

Hagen Woesner, BISDN
Conference Chair

Message from the Program Chairs

After the first two editions of EWSDN, this workshop has consolidated itself a place in the landscape of workshops and conferences in the still quickly growing area of software-defined networking. This has materialized in a number of submissions to this workshop that allowed us do a quality-based selection process. In concrete numbers, we have received 69 submissions, out of which we accepted 33, with somewhat higher acceptance ratios for demos and posters than for regular papers. Also topic-wise, we saw interesting results from the review process: The lion share of submissions as well as accepted papers pertained to the “Architecture” topic range. On the other hand, the applications topic also saw a lot of submissions (third place among all topics), but here the acceptance ratio was rather low. It will be interesting to see in future years whether this will stabilize or whether we will see a trend from more conceptual, architectural work towards more applications-oriented work, and whether this will be appreciated by the future program committees.

Regionally, EWSDN is still dominated by European submissions and European authors. Non-European submissions mostly came from (in decreasing order) the US, Korea, Brazil, and Japan.

The review process resulted in a mix of traditional papers as well as posters and demonstrations; in addition, we invited submissions for position papers that were intended to be less technically detailed but to give bigger-picture considerations. We shall see at the conference whether this experiment with such a paper format resonated with the authors and the audience. In addition, we are very pleased to be able to present several keynote addresses from distinguished speakers: Adrian Farrel, Igor Faynberg and Gabriele Galimberti. We are confident that these keynotes will give good input and feedback form an industrial perspective to the discussions at the conference.

We hope that our audience will enjoy the program and that they will leave Budapest invigorated and refreshed with new ideas.

Róbert Szabó, Holger Karl
Technical Program Committee Chairs


Gold Sponsor

Technical Co-sponsors



1 September 2014

09:00 ALIEN tutorial on advanced technologies in OpenFlow networks

13:00 Lunch

14:00 Keynote

The Role of PCE in an SDN World
Adrian Farrel, Old Dog Consulting & Routing Area Director IETF

15:00 Break

15:30 Technical Session 1: Data Paths

Robert Szabó, Ericsson

Supporting Fine-Grained Network Functions through Intel DPDK
Ivano Cerrato, Mauro Annarumma and Fulvio Risso

Programmable Abstraction of Datapath
Damian Parniewicz, Bartosz Belter, Artur Binczewski, Krzysztof Dombek, Artur Juszczyk, Łukasz Ogrodowczyk, Maciej Stroiński and Iwo Olszewski

OSHI - Open Source Hybrid IP/SDN networking (and its emulation on Mininet and on distributed SDN testbeds)
Stefano Salsano, Pier Luigi Ventre, Luca Prete, Giuseppe Siracusano, Matteo Gerola and Elio Salvadori

A Datapath-centric Virtualization Mechanism for OpenFlow Networks
Roberto Doriguzzi Corin, Elio Salvadori, Matteo Gerola, Marc Sune and Hagen Woesner

2 September 2014

09:00 Keynote

NFV Security: Yesterday, Today, and Tomorrow
Igor Faynberg, Alcatel-Lucent

10:00 Technical Session 2: Technology

Hagen Woesner, BISDN

Wildcard Compression of Inter-Domain Routing Tables for OpenFlow-based Software-Defined Networking
Wolfgang Braun and Michael Menth

Pushing Software Defined Networking to the access
Richard Clegg, Jason Spencer, Raul Landa, Manoj Thakur and Miguel Rio

Integrating complex legacy systems under OpenFlow control: The DOCSIS use case
Victor Fuentes, Jon Matias, Alaitz Mendiola, Maider Huarte, Juanjo Unzilla and Eduardo Jacob

11:30 Break

12:00 Gold Sponsor Address

András Császár, Ericsson Research

12:15 Position Papers

Kostas Pentikousis, EICT

Reactive Logic in Software-Defined Networking: Accounting for the Limitations of the Switches
Roberto Bifulco and Maurizio Dusi

On the benefits of RAN virtualisation in C-RAN based mobile networks
Alex Dawson, Frankie Garcia and Mahesh Marina

Software-Defined Network Service Chaining
Jeremias Blendin, Julius Rückert, Nicolai Leymann, Georg Schyguda and David Hausheer

13:15 Lunch

14:15 Demo/Poster session (Teaser slides)

Balázs Sonkoly, BME

16:00 Break

16:30 Technical Session 3: System Views

Andreas Gladisch, DTAG

ForCES Applicability to SDN-enhanced NFV
Evangelos Haleplidis, Damascene Joachimpillai, Jamal Hadi Salim, Diego Lopez, Jason Martin, Kostas Pentikousis, Spyros Denazis and Odysseas Koufopavlou

Implementing Quality of Service for the Software Defined Networking Enabled Future Internet
Sachin Sharma, Dimitri Staessens, Didier Colle, David Palma, Joao Goncalves, Ricardo Figueiredo, Donal Morris, Mario Pickavet and Piet Demeester

Unifying the Programmability of Cloud and Carrier Infrastructure
Pontus Sköldström, Balazs Sonkoly, András Gulyás, Felicián Németh, Mario Kind, Fritz-Joachim Westphal, Wolfgang John, Jokin Garay, Eduardo Jacob, Janos Elek, Dávid Jocha, Robert Szabó, Wouter Tavernier, George Agapiou, Antonio Manzalini, Matthias Rost, Nadi Sarrar and Stefan Schmid

3 September 2014

09:00 Keynote

From Transport SDN to ML agnostic SDN: How
Gabriele Maria Galimberti, Cisco

10:00 Technical Session 4: Resilience & Domains

Eduardo Jacob, EHU

Fast Recovery in Software-Defined Networks
Niels van Adrichem, Benjamin van Asten and Fernando Kuipers

AutoVFlow: Autonomous Virtualization for Wide-area OpenFlow Networks
Hiroaki Yamanaka, Eiji Kawai, Shuji Ishii and Shinji Shimojo

On the Design of Practical Fault-Tolerant SDN Controllers
Fábio Botelho, Alysson Bessani, Fernando Ramos and Paulo Ferreira

11:30 Break

12:00 Technical Session 5: Security

Stefan Schmid, TU-Berlin

FlowNAC: Flow-based Network Access Control
Jon Matias, Jokin Garay, Alaitz Mendiola, Nerea Toledo and Eduardo Jacob

Leveraging SDN for Efficient Anomaly Detection and Mitigation on Legacy Networks
Kostas Giotis, Georgios Androulidakis and Vasilis Maglaris

C-BAS: Certificate-based AAA for SDN Experimental Facilities
Umar Toseef, Adel Zaalouk, Tom Rothe, Matthew Broadbent and Kostas Pentikousis

14:30 in parallel

A Hands-on Approach to Hybrid SDN deployment and operations

EU-China FIRE Workshop on Automatic Future Internet Standardization on SDN, NFV & IPv6 Impacts

Demos & Posters


CityFlow - Results from the CityFlow Project
Adam Carter, Donal Morris, Sachin Sharma, Luís Cordeiro, Ricardo Figueiredo and João Gonçalves

MAPPER: a Mobile Application Personal Policy Enforcement Router for Enterprise Networks
Amadeo Sapio, Yong Liao, Mario Baldi, Gyan Ranjan, Fulvio Risso, Alok Tongaonkar, Rubé Torres and Antonio Nucci

Demonstrating a Distributed and Version-agnostic OpenFlow Slicing Mechanism
Daniel Depaoli, Roberto Doriguzzi Corin, Matteo Gerola and Elio Salvadori

User-specific Network Service Functions in an SDN-enabled Network Node
Fulvio Risso, Ivano Cerrato, Alex Palesandro, Tobias Jungel, Marc Sune and Hagen Woesner

Demonstration of SDN-Based Optical Network Virtualization and Multidomain Service Orchestration
Thomas Szyrkowiec, Achim Autenrieth, Jörg-Peter Elbers, Wolfgang Kellerer, Pawel Kaczmarek, Victor López, L. Contreras, O. Gonzalez de Dios, J. P. Fernádez-Palacios, Raul Muñoz, Ricard Vilalta, Ramon Casellas, R. Martiñez, A. Mayoral, M. Channegowda, Shuping Peng, R. Nejabati and D. Simeonidou

Software-Defined Network Service Chaining
Julius Rückert, Jeremias Blendin, Nicolai Leymann, Georg Schyguda and David Hausheer

Multi-layered Service Orchestration in a Multi-Domain Network Environment
Attila Csoma, Balá Sonkoly, Levente Csikor, Felicián Németh, András Gulyás, Dávid Jocha, János Elek, Wouter Tavernier and Sahel Sahhaf


RAON: Recursive Abstraction of OpenFlow Networks
Sae Hyong Park, Byungjoon Lee, Jaeho You, Jisoo Shin, Taehong Kim and Sunhee Yang

Hardware Abstraction Layer as an SDN-Enabler for non-OpenFlow Network Equipment
Bartosz Belter, Damian Parniewicz, Łukasz Ogrodowczyk, Artur Binczewski, Maciej Stroiński, Victor Fuentes, Jon Matias, Maider Huarte and Eduardo Jacob

Leading the OFELIA Facility Beyond OpenFlow 1.0 Experimentations
Michele Santuari, Roberto Doriguzzi Corin, Matteo Gerola, Elio Salvadori, Umar Toseef, Adel Zaalouk, Krzysztof Dombek, Damian Parniewicz, Ali Hammad, Mehdi Rashidi-Fard, Eduardo Jacob and Jon Matias

A High-Performance IO Engine for SDN Controllers
Sae Hyong Park, Byungjoon Lee, Jisoo Shin and Sunhee Yang

An OpenFlow Implementation for Network Processors
Marc Suñe, Victor Alvarez, Tobias Jungel, Umar Toseef and Kostas Pentikousis

The QueuePusher: Enabling Queue Management in OpenFlow
David Palma, Joao Goncalves, Bruno Sousa, Luis Cordeiro, Paulo Simoes, Sachin Sharma and Dimitri Staessens

OFLOPS-Turbo: Testing the Next-Generation OpenFlow Switch
Charalampos Rotsos, Gianni Antichi, Marc Bruyere, Philippe Owezarski and Andrew W. Moore


ALIEN Tutorial on advanced technologies in OpenFlow networks

Organized by Bartosz Belter (PSNC), Kostas Pentikousis (EICT), Marc Suñé (BISDN) and Eduardo Jacob (UPV/EHU)

Hardware Abstraction Layer in practice

Software Defined Networking (SDN) capitalizes on splitting the data and control planes and offers new opportunities for network control and management. In short, a controller that sits in the Network Operation System layer takes global decisions about the data plane traffic control. Although the OpenFlow protocol is now widely considered for communication between a logically centralized controller and network devices, many network devices do not support it natively, be that due to the nature of the forwarding paradigm or because of legacy reasons: OpenFlow was designed for wired Ethernet and does not support, e.g., circuit-switched and wireless platforms. The Hardware Abstraction Layer, defined and developed within the FP7 ALIEN project, is an experimentally-verified concept for describing network device capabilities and controlling the forwarding behavior of all OpenFlow and non-OpenFlow capable hardware throughout a network. This tutorial will provide a detailed overview of the ALIEN HAL. Once the HAL is introduced and discussed, the project experts will explain how to use the project outcomes to develop their own OpenFlow stack for non-OpenFlow equipment. During the tutorial, the lessons learned from implementing the ALIEN stack on a variety of hardware will be presented, providing ample room for further interactive discussions between the experts in the panel and the audience.

Network Management in SDN-based networks

The management of SDN-based networks is still considered as an important research domain, not fully covered by traditional models of current network management practices. During this tutorial the audience will learn about the new approach towards virtualization of SDN networks, which overcomes the well-known issues of FlowVisor. Additionally, during this session the certificate-based AAA framework for SDN networks will be explained in detail, providing both, an implementation-driven approach for a short deployment cycle in current facilities, but also outlining a credible migration path which is currently pursued actively in the project.

Target audience

The tutorial is mainly aimed at network engineers and networked software developers from research and academia, SME and industry targeting the SDN market. The tutorial is complemented by a set of comprehensive demonstrations scheduled to the second day of EWSDN 2014, including the use of proof-of-concept prototypes as stand-alone applications or validated services over OFELIA, the European OpenFlow SDN experimental facility designed, implemented and maintained through FIRE.

Tutorial Outline

Introduction to SDN experimental facilities in Europe: OFELIA and ALIEN

The ALIEN HAL architecture, implementation & lessons learned

  • Octeon
  • EZappliance

Network Management in SDN-based networks

  • New approach towards virtualization
  • AAA Framework

Experimentation experience and results

Summary & Conclusions

Download the ALIEN tutorial PDF

A Hands-on approach to hybrid SDN deployment and operations

Organized by Stefan Schmid (TU Berlin/Telekom Innovation Laboratories, Germany), Dan Levin (BadPacket Industries, Germany); Fabian Schaffert (BadPacket Industries, Germany)

14:30 - 14:50 Introduction to Hybrid SDN Operations

We will present a longitudinal survey using illustrative slides which describe different academic and industrial approaches to plan and incrementally deploy and operate hybrid Software Defined Networks. We will examine the following questions: Assuming we are given an existing enterprise network, how does one introduce SDN capable devices (or make use of existing ones) and how should they be made to interact with the existing IP Routers and Ethernet Switches? What are the technical and operational challenges of introducing the SDN control interface into an existing network? We include 4 brief case studies from industry and academia demonstrating the objectives for hybrid SDN deployment and the challenges toward realizing them.

14:50 - 16:00 Introduction to Panopticon + Hands-on Exercise 1

16:00 - 16:10 Break

16:10 - 17:10 Panopticon Subnet Mobility Use Case + Hands-on Exercise 2

Panopticon: We begin by introducing our architecture and methodology for planning, deploying, and operating a hybrid SDN in the enterprise network context. We will provide virtual machines to individual participants — which will be used to demonstrate and explore concepts of Panopticon. Participants will require at a bare minimum a modern web browser (Firefox, Chrome, or Safari): Participants may optionally utilize an ssh client to interact directly with our VMs Participants will be presented with a simple, emulated network topology running in mininet on the provided VMs. Participants will have the ability to interact with this topology through our web application interface to explore different design parameters and trade-offs inherent to the Panopticon architecture. Participants will be able to try different SDN switch deployment strategies and observe the consequences for Ethernet switch VLAN consumption, path diversity, fault tolerance properties, flow table state consumption, and policy expression Participants will conduct an experiment which demonstrates how Panopticon interacts with existing legacy control protocols such as STP to infer network topology and path cost metrics in the hybrid SDN.

Participants will build upon the architectural foundations of Panopticon to solve a specific operational problem: Subnet Mobility. A brief background will be provided to compare and contrast of existing approaches to subnet mobility including Loc+ID separation and mapping schemes, L2 Tunneling, L3 Tunneling, MPLS. Participants will explore a use-case for managing IP Subnet mobility in the context of a network using a simple static IP Routing scheme. Using the RYU controller framework, boiler-plate python code will be provided to implement a proof-of-concept controller, and participants will be guided through the task of completely implementing the IP subnet mobility manager. Participants will demonstrate the ability to dynamically migrate hosts from within a single organizational unit across subnet boundaries.

17:10 - 17:20 Content Review + Wrap-up and Q/A

EU-China FIRE workshop

Workshop on Autonomic Future Internet standardization and SDN, NFV & IPv6 impacts

By Philippe Cousin (Eglobalmark, France)


The objective of this 2nd EU-China FIRE European workshop is to discuss global status of Autonomic Future Internet Standardisation as well as presenting Experimental Platforms (i.e. FIRE facilities), which could be used, on these topics by researchers in EU, China and worldwide.

The workshop is organised by the FP7 EU CHINA FIRE project (www.euchina-fire.eu) which is only facilitating these important discussions on Future Internet at worldwide level.


13:00–14:00 Session 1: Welcome Messages and Brief status on Standardization on SDN, NFV, Autonomic Future Internet and IPv6 as well as importance of FIRE / Experimental platforms

  • About European Commission FIRE activities, and about the need for research projects to adopt Standards for Future Internet experiment platform Federation
    Nikolaos Isaris, EC DG CONNECT, Deputy head of unit , FIRE
  • About the need for research projects to adopt emerging standards and contribute to Standards for Autonomic Future Internet Dr. Ranganai Chaparadza (AMC, SDN and NFV Standardization Expert & Advisor)

14:00–15:40 Session 2: Contributing to Unified Standards for AMC, SDN and NFV

Presenters: Dr Ranganai Chaparadza, PhD; and Tayeb Ben Meriem, PhD; PDTN representative & presenter Session Chair: Dr. Ranganai Chaparadza, IPv6 Forum, ETSI AFI.

Scope of Session:


  1. Latest status on SDN and NFV standardization and link to other areas
    • ETSI : Patrick Guillemin, ETSI
    • View of Telecom Operator including link to IPv6. Christian Jacquenet, Orange
    • NFV PoC (Proof of Concept)
    • View from China: Huang Yan, Ruije
  2. PDTN Architecture, Standardization Roadmap and the need for Standardized Autonomics(AMC) in PDTN
  3. Report on Harmonization for Unified Standards on Autonomic Management and Control (AMC) of Networks & Services, SDN & NFV, and related Groups/Fora collaborations


    Dr Ranganai Chaparadza, IPv6 Forum, ETSI AFI.

    • Tutorial: Instantiation of the ETSI AFI GANA Reference Model onto the PDTN Architecture to create an Autonomicity – Enabled PDTN architecture
  4. Standardization of Network Resilience & Survivability, Recovery, Autonomic Fault-Management and Autonomic Security Management in Evolving & Future Networks


    Introducing instruments that enable experts from various groups (cross-SDO) and Research Communities to work together on harmonization of frameworks corresponding to all the key emerging paradigms collectively
    Tayeb Ben Meriem, Directeur R&D Orange France Telecom

15:45–16:45 Session 3: Experimental Platforms for Autonomic Future Internet and needs/possibilities for Federation

Session Chair: Philippe Cousin, Project Manager of the EU-China FIRE Project.

Scope of Session:


  1. EU offers on FIRE/Experimental Platforms for Autonomic Future Internet, SDN, NFV (including report on NFV Proof of Concept):
    Hagen Woesner, Ofelia
    Spyros Denasis, Patras Platform for Experimentation University of Patras
  2. Fed4Fire specifications for federation
    Florian Schreiner, FOKUS
  3. China offers for experimental platforms, use of fed4fire specs:
    Gaogang Xie, China Academy of Sciences
  4. Other example of cooperation with China : Mediasense , infrastructures and support for ultralow latency communication for realtime massive and scalable IoT
    Theo Kanter, University Stockholm


16:30–17:30 Session 4: Panel Session on Complementarities of AMC, SDN, NFV and IPv6, as Enablers for 5G; and Discussion on How Research Projects can contribute to new Standardization activities Session Chair: Dr. Ranganai Chaparadza (AMC, SDN and NFV Standardization Expert & Advisor)

Scope of Session:

  1. Complementarities of AMC, SDN, NFV and IPv6, as Enablers for 5G
  2. Discussion on How Research Projects can contributed to Standardization activities on Unified Standards for AMC, SDN and NFV paradigms, and Network Resilience, Recovery and Autonomic Fault and Security Management
  3. Needs for Standards for global federation of experimental platforms and issues related to it


All presenters + Yan Zen, China Ministry of Education, IIU (Internet Innovation Union) Representative from CATR, BII


The 3rd European Workshop on Software-Defined Networks will be held from 1-3 September 2014 in Budapest, Hungary.

Venue of the workshop is the Danubius Hotel Gellért
Szent Gellért tér 1.
1111 Budapest

Phone: +36-1-889-5500
E-Mail: gellert.reservation@danubiushotels.com
Web: http://www.danubiushotels.com/gellert


Workshop Chair

Hagen Woesner EICT, Germany

Industrial Track Chair

Diego R. Lopez Telefonica I+D, Spain

Publicity Chair

Stefan Schmid TU Berlin / Telekom Innovation Laboratories, Germany
Pontus Sköldström Acreo AB, Sweden

Workshop Operations Chair and Web Chair

Mario Druse EICT, Germany

Local Organizing Chair

Valéria Molnár BME, Hungary

Demo and Exhibition Chair

Balázs Sonkoly BME, Hungary

Steering Committee

Andreas Gladisch Deutsche Telekom Laboratories, Germany
Holger Karl University Paderborn, Germany
Diego R. Lopez Telefonica I+D, Spain
Kostas Pentikousis EICT, Germany
Elio Salvadori CREATE-NET, Italy
Stefano Salsano Univ. Tor Vergata, Italy
Róbert Szabó Ericsson Research, Hungary
Hagen Woesner BISDN, Germany

Technical Program Committee Co-Chairs

Holger Karl University Paderborn, Germany
Róbert Szabó Ericsson, Hungary

Technical Program Committee

Rui Aguiar Universidade de Aveiro, Portugal
Achim Authenrieth ADVA Optical Networking, Germany
Siamak Azodolmolky GWDG, Germany
Leonardo Bergesio i2CAT Foundation, Spain
Dean Bogdanovic Juniper Networks, USA
Marco Canini Université catholique de Louvain (UCL), Belgium
Ramon Casellas CTTC, Spain
Nicola Ciulli Nextworks, Italy
Richard Clegg University College London, UK
Didier Colle Ghent University, Belgium
Daniel Corujo Instituto de Telecomunicações, Portugal
Panagiotis Demestichas University of Piraeus, Greece
Alisa Devlic Royal Institute of Technology (KTH) Stockholm, Sweden
Peter Feil Telekom Innovation Laboratories, Germany
Panagiotis Georgopoulos ETH Zurich, Switzerland
Stefano Giordano University of Pisa, Italy
Eduardo Jacob University of the Basque Country, Spain
Wolfgang John Ericsson Research, Sweden
Pawel Kaczmarek Poland
Kostas Katrinis IBM, Ireland
Eiji Kawai NICT, Japan
Eric Keller University of Colorado, USA
Wolfgang Kellerer Technische Universität München, Germany
Daniel King Lancaster University, UK
Teemu Koponen VMware, USA
Marc Körner TU Berlin, Germany
Dejan Kostic Institute IMDEA Networks, Spain
Diego R. Lopez Telefónica I+D, Spain
Dante Malagrino Embrane, USA
Antonio Manzalini Telecom Italia Lab, Italy
Jon Matias University of the Basque Country, Spain
Ruben Merz Swisscom, Switzerland
Saverio Niccolini NEC Laboratories Europe, Germany
Kostas Pentikousis EICT, Germany
Luca Prete Consortium Garr, Italy
Nicholas Race Lancaster University, UK
Costin Raiciu University Politehnica of Bucharest, Romania
Robert Raszuk NTT, USA
Roberto Riggio CREATE-NET, Italy
Christian Esteve Rothenberg
University of Campinas, Brazil
Charalampos Rotsos University of Cambridge, UK
Kostas Tsagkaris University of Piraeus, Greece
Elio Salvadori CREATE-NET, Italy
Stefano Salsano Univ. Tor Vergata, Italy
Stefan Schmid TU Berlin / Telekom Innovation Laboratories, Germany
Pontus Sköldström Acreo AB, Sweden
Georgios Smaragdakis TU Berlin / Telekom Innovation Laboratories, Germany
Bill Snow ON.Lab, USA
Balázs Sonkoly BME, Hungary
Marc Sune BISDN, Germany
Attila Takacs Ericsson, Hungary
Kostas Tsagkaris University of Piraeus, Greece
Zoltan Turanyi Ericsson, Hungary
Steve Uhlig TU Berlin / Telekom Innovation Laboratories, Germany
Hagen Woesner BISDN, Germany