Projects

To give an insight of the current and former research areas and topics at the IKR.

Table of actual and former projects of the IKR

100 Gigabit Ethernet Architectures and Protocols
Funding

Public funding
German Federal Ministry of Education and Research (BMBF)

Overview and Objectives

Continuously increasing traffic volumes in combination with decreasing revenue per bit require inexpensive solutions for transport networks. On the one hand, state of the art network technologies like the circuit switched SDH and the packet switched IP might be options for such networks but come along with severe drawbacks. On the other hand, Ethernet has recently been considered as a promising candidate for enabling inexpensive transport networks, last but not least due to its wide usage in local area networks. While Ethernet has been designed for packetized traffic and thus is appropriate for the predominant part of traffic in today's transport networks, its basic form does not offer the scalability, reliability, and managability properties required for carrier-grade networks. Therefore, different approaches to realize "carrier grade" Ethernet are followed.

High bandwidth demands also drive the development towards ever higher bit rates on the physical layer of optical transport networks. After having accomplished transmission at 40Gbps and components being available for this rate, research now targets 100Gbps.

On the way to a future 100Gbps Ethernet-based transport network, serveral issues have to be addressed. On the one hand, optical transmission technology allowing for such throughputs has to be developed. On the other hand, "carrier grade" properties need to be added to Ethernet. According standardization approaches are being undertaken by IEEE with PBB-TE (Provider Backbone Bridging - Traffic Engineering) and by the ITU with T-MPLS (Transport Multiprotocol Label Switching). However, many questions still remain open.

The BMBF-funded research project 100GET therefore targets a comprehensive approach to next generation transport networks by focussing on the realization of 100Gbps transmission as well as network architecture and protocols.

IKR activities

IKR activities within this project mainly focus on network architecture, control, and management and can be subdivided into the following work areas:

  • Overall Network Architecture
    In this work package a model for a carrier grade ethernet will be developed enabling studies dealing e.g. with topology design, network dimensioning, and routing. Thereby concepts of an end-to-end Ethernet will also be taken into account.
  • Protocol Aspects
    This work package centers on reducing the processing load in network nodes due to the high data rate. Several approaches therefore exist, including the adaption of the MAC frame size. The feasibility of such mechanisms along with their impact on hetereogeneous networks are studied and appropriate parameters are identified.
  • Network Control
    The design of the control plane of a transport network is currently an open issue. Several approaches having specific characteristics are imaginable. Therefore, studies concerning the performance will support the selction and design of a suitable solution.
Methods applied
  • Network architecture and protocol design
  • Teletraffic theory and engineering
  • Event-driven simulation using IKRSimLib
Publications

2008

Scharf, J.; Feller, F.
Changing the Ethernet Protocol - Benefits and Drawbacks
8th Würzburg Workshop on IP: Joint EuroNF, ITC, and ITG Workshop on 'Visions of Future Generation Networks' (EuroView2008), Würzburg, July 2008
[Show full record]
Project website

www.celtic-initiative.org/Projects/100GET/

Architekturen, Technologien, offene Netzinfrastruktur für das optische Breitbandzugangsnetz
Funding

Public funding
German Federal Ministry of Education and Research (BMBF)

Overview and Objectives

The goal of the project ATOB is to identify the requirements for the next but one generation of NGOA (Next Generation Optical Access) and to evaluate the design of applicable systems and components independent of vendors.

First, the relationship between reach, capacity, flexibility and cost of the evaluated access network concepts are investigated, to develop appropriate rules for optimizing the economic expansion and operation of NGOA networks. Requirements for the optimal solutions are specified and then brought into standardization bodies.

The knowledge required for this process relies on an intensive dialogue between network operators and universities for the analysis of the technology limits and for the neutral technology evaluation. Based on this, the requirements are discussed with manufacturers of system and component manufacturers so that technically and economically optimal systems are available on the market in time.

The ATOB project concentrates on OFDM (Orthogonal Frequency Division Multiplexing), which are largely unexplored in the optical access area and could be implemented as from 2014/15. This approach is already very successfully used in radio access networks and has enormous potential for NGOA. Operators see it as a promising and cost-efficient solution to realize both optical access networks and optical local area networks. The project combines basic architectural considerations of the network with issues of business models. It evaluates new concepts for transmission equipment and MAC (Medium Access Control) protocols for access networks. Further it evaluates signaling and monitoring approaches as well as practical issues by implementing an open and realistic test network in Berlin to test these NGOA techniques.

IKR activities

OFDM provides a new degree of freedom for resource allocation (using Medium Access Control, MAC) in the access network in addition to the commonly used dimensions of time and wavelength. This new duse this new degree of freedom for optimal use of available resources on the transmission medium at the same time respecting the security to meet availability and reliability of the participant connection. Due to the large spatial extent of future access networks also solutions for scenarios with a very high number of end users that compete on the same available resources have to be covered. Fairness among these users also has to be considered. In addition, it must be remembered that by observing the media access it might become possible to draw conclusions about the load pattern on the other end stations ans applications.

As the basis for studies of MAC protocols in this work package, other work packages provide a definition of the design space with initial assumptions about the relevant parameters of the physical layer, which is later refined by successive measurements.

Based on the requirements of higher layers protocols, services and the applications, the boundary conditions of the physical layer the MAC concepts are evaluated by means of system simulations. Critical parameters and results are later compared with measurements. The results are neutral conclusions about the performance of the MAC solutions along with an assessment of the implementation complexity of the studied approaches.

Methods applied
  • Teletraffic theory and engineering
  • Network architecture and protocol design
  • Event-driven simulation using IKRSimLib

 

Baseband Unit Pooling
Funding

Privat funding

Overview and Objectives

The load of base stations in mobile wireless networks varies over time. Approaches exist to centralize the baseband processing resources of multiple base stations. This centralization allows to exploit a multiplexing gain, thereby saving resources compared to the decentralized deployment. The multiplexing gain depends on the size of the served area and the density and activity of users. The multiplexing gain can be increased by the fact that the load peaks in home and work locations occur at different times of the day.

In this project, we evaluate the expected multiplexing gain. We develope models for the user activity and it's distribution over the area of a city and over the time of the day. We model the processing resource requirements for different modes of radio transmission. Based on these models, we estimate the amout of processing resources which is required to handle all data traffic occuring in the serving area.

Methods applied
  • Mobile radio network modeling
  • Traffic modeling
  • Event-driven simulation using IKRSimLib
Student Projects

Optimal Allocation of Processing Resources to Antennas in Wireless Access Networks
(Bachelor thesis No. 830, (none))

Building the Future Optical Network in Europe
Funding

Public funding
European Commission

Overview and Objectives

The BONE project builds on the foundations laid out by the e-Photon/ONe projects. These Networks of Excellence have successfully brought together over several years the research activities within Europe in the field of Optical Networks. The BONE-project intends to validate this effort by stimulating a more intensified collaboration and exchange of researchers. This network of excellence can serve to the European industry with education & training, research tools & testlabs and pave the way to new technologies & architectures. 

BONE aims at a broad spectrum of network technologies and services related to optical networks. It includes activities ranging from in-building networks and access networks up to metro networks and core networks. Orthotogonal to the previous ones further BONE activities range from optical transmission systems and optical switching systems up to network services and applications.

IKR activities

Within BONE the IKR will address issues emerging in core networks. The different topics are distributed in the following topical projects and virtual center of excellences.

  • VCE - Network Technologies and Engineering
    Performance evaluation of resilience and protection schemes in core networks, e.g., dynamic protection schemes.
  • TP - MPLS, GMPLS & routing
    Performance evaluation and scalability analysis of modern GMPLS control planes.
  • TP - Edge-to-core adaptation for hybrid networks
    Influence of OBS/OPS reordering on higher layer protocols.
  • TP - Alternatives for ML networking with cross layer optimization
    Feasibility analysis and performance evaluation of ML routing schemes.
Methods applied
  • Event-driven simulation
  • Prototype implementation & measurement
  • Teletraffic theory and engineering
Student Projects

Design und Implementierung eines Protokollgateway für eine Pfadberechnungseinheit
(Master thesis No. 685, Finished)

Publications

2010

Gunreben, S.; Casellas, R.; Martinez, R.; Munoz, R.; Scharf, J.
Experimental Validation and Assessment of Multi-domain and Multi-layer Path Computation
Proceedings of the 6th International Conference on Testbeds and Research Infrastructures for the Development of Networks and Communities (TridentCom 2010), Berlin, May 2010
[Show full record]

 
2009

Gunreben, S.; de Dios, O.G.
Why deterministic traffic shows the highest reordering ratio
Proceedings of the International Workshop on Optical Burst/Packet Switching (WOBS 2009), Madrid, 2009
[Show full record]
 
Callegati, F.; Cugini, F.; Ghobril, P.; Gunreben, S.; Lopez Alvarez, V.; Martini, B.; Pavon-Marino, P.; Perenyi, M.; Sengezer, N.; Staessens, D.; Szigeti, J.; Tornatore, M.
Optical Core Networks Research in the e-Photone-ONe+ Project
Journal of Lightwave Technology, Vol. 27, No. 24, December 2009
[Show full record]
 
Casellas, R.; Martinez, R.; Munoz, R.; Gunreben, S.
Enhanced Backwards Recursive Path Computation for Multi-area Wavelength Switched Optical Networks Under Wavelength Continuity Constraint
to appear in the IEEE/OSA Journal of Optical Communications and Networking, Vol. 1, No. 2, July 2009, pp. A180-A193
[Show full record]

 

2008

Gunreben, S.
An Optical Burst Reordering Model for a Time-based Burst Assembly Scheme
Proceedings of the International Workshop on Optical Burst/Packet Switching 2008 (WOBS 2008), London, September 2008
[Show full record]

 

Context-Aware Resource Allocation
Funding

Privat funding

Overview and Objectives

Today's cellular radio networks are often overloaded by data traffic. The high load is partially caused by the increasing number of smartphones, tables, and mobile computers. In addition, due to cheap fees, the users install and use applications independent of their generated traffic. These applications include interactive ones and those which transmit in the background, as operating system updates and synchronizing with cloud services. Also, depending on the user's context, the requirements of the applications for the network can be different. Current mobile networks are not aware of these requirements. Instead, they can only strive for high throughput or low packet delay in a generic manner.

In this project, we use a new metric on the application layer in addition to the classical throughput metric. We design an architecture which allows the base station to be aware of the requirements of the applications. Based on that, we compose, implement, and evaluate scheduling algorithms (context aware resource allocation, CARA), which increase the performance of the network on application layer.

Methods applied
  • Mobile radio network modeling
  • Network architecture and protocol design
  • Event-driven simulation using IKRSimLib
Publications

2010

Proebster, M.; Kaschub, M.; Valentin, S.
Self-Organizing QoS Optimization by Context-Aware Resource Allocation
Fifth International Workshop on Self-Organizing Systems (IWSOS 2011), Karlsruhe, February 2011
[Show full record]
 
Proebster, M.; Kaschub, M.; Valentin, S.
Context-Aware Resource Allocation to Improve the Quality of Service of Heterogeneous Traffic
IEEE International Conference on Communications (ICC 2011), Kyoto, June 2011
[Show full record]

 

2012

Proebster, M.; Kaschub, M.; Werthmann, T.; Valentin, S.
Context-Aware Resource Allocation for Cellular Wireless Networks
EURASIP Journal on Wireless Communications and Networking, 2012
[Show full record]
Coordinated Precoding
Funding

Privat funding

Overview and Objectives

The aim of the project is to reduce interference in LTE and LTE-A mobile communication systems by coordinating a codebook based precoding in neighboring base stations. The project evaluates the influence of the characteristics of the data traffic on the possibility to cooordinate the transmissions. Delayed reporting of the channel measurements by mobiles and boundary conditions of a typical backhaul link are taken into account.

IKR activities

The IKR analyzes the output of traffic models to determine which amount of traffic can be transmitted in coordinated mode. Different schemes for the setup of a coordinated transmission are evaluated with respect to their influence on the user experience. The capability of the coordination of the precoding selection is evaluated with a centralized optimization heuristic. Based on that, a distributed coordination algorithm is designed and evaluated.

Methods applied
  • Simulation
  • Heuristical Optimizaiton

 

COST Action 2100 - Pervasive Mobile & Ambient Wireless Communications
Funding

Public funding
European Commission

Overview and Objectives

The main focus of this COST action is on propagation and antennas, transmission techniques and signal processing, as well as radio network aspects. Its objectives are to increase knowledge and suppport the exchange and discussion of results on mobile and wireless network technologies in general, and to foster cooperation among researchers at European level and beyond.

IKR activities

Within COST 2100, the IKR is most interested in the following areas:

  • WG 1-Transmission techniques and signal processing
  • WG3 - Radio Network Aspects
  • SWG 3.1 - Measurements Based Optimisation for Mobile Wireless Nets
  • SIG D - Layer Interaction

The IKR joined COST 2100 at the beginning of 2009 and is now the contact for researchers of the Universität Stuttgart for membership requests and submission of publications.

Project website

COST 2100

Advanced Infrastructure for Photonic Networks
Funding

Public funding
European Commission

Overview and Objectives

The primary objective of the Action is to devise possible architectures for the next generation of high capacity optical transport and also access networks. The target architecture should

  • provide virtually unlimited end-to-end bandwidth regardless of distance enabling instant movement of huge amounts of data for applications,
  • enable efficient and simple multicasting and broadcasting of broadband signals,
  • be flexible and agile in order to accommodate abrupt and unpredictable traffic surges and to react instantaneously when failures occur, allowing seamless and errorless transmission of large data blocks,
  • be transparent to all sorts of digital signals and protocols so that it would enable to accommodate a number of network types and services simultaneously or in succession deployed over time,
  • trade bandwidth for simplicity to alleviate the complexity problem in the communication networks resulting mainly from the ever increasing amount of software residing in the networks that raises costs and lowers reliability of the networks.
IKR activities

The IKR objectives in the Action are

  • to discuss results of current research in the field of photonic networking
    • Network and node architecture of optical burst switching networks
    • Routing in multilayer networks
  • to maintain or extend existing and setup new close connections to other research groups in Europe

Beyond scientific contributions, IKR served on the Management Committee of COST 266. IKR also actively contributed to COST 239.

Publications

2003

Inkret, R.; Kuchar, A.; Mikac, B.; Gauger, C.M.; Köhn, M.
Advanced Infrastructures for photonic Networks - Extended Final Report of COST Action 266
Report, Faculty of Electrical Engineering and Computing, University of Zagreb, Zagreb, Croatia, 2003
[Show full record]
 
De Maesschalck, S.; Colle, D.; Puype, B.; Yan, Q.; Pickavet, M.; Demeester, P.; Cinkler, T.; Mauz, C.; Sanchez-Lopez, S.; Masip-Bruin, X.; Sole-Pareta, J.; Tomic, S.; Ljolje, M.; Lackovic, M.; Inkret, R.; Mikac, B.; Schupke, D.A.; Mattiello, M.; Köhn, M.; Gauger, C.M.
Circuit/wavelength switching and routing - Report of the Achievements of the COST-action 266
Proceedings of the 7th International Conference on Telecommunications (ConTEL 2003), Zagreb, June 2003
[Show full record]


2002

Bjoernstad, S.; Vandeweerd, S.; Cheyns, J.; Develder, C.; Colle, D.; Van Breusegem, E.; De Maesschalck, S.; Pickavet, M.; Demeester, P.; Stavdas, A.A.; Hjelme, D.R.; Stol, N.; Nord, M.; Klinkowski, M.; Marciniak, M.; Callegati, F.; Cerroni, W.; Careglio, D.; Junyent, G.; Sole Pareta, J.; Spadaro, S.; Gauger, C.M.; Rafel, A.
Advanced Infrastructures for Photonic Networks: WG 2 Intermediate Report 2002
2002
[Show full record]
Analysis and Design of Advanced Multiservice Networks supporting Mobility, Multimedia, and Internetworking
Funding

Public funding
European Commission

Overview and Objectives

The main objective of the Action is to develop techniques for the analysis, design and control of advanced multiservice networks supporting mobility, multimedia and interworking, by means of the development and application of new and better analytical techniques for the mathematical understanding and optimisation of the behaviour of communications equipment, protocols, and network topologies and architectures, and of economic aspects such as pricing principles and network cost estimation.

Following the successful lines of research of the previous COST Actions in these areas, this Action is targeting in particular its research on corresponding subjects such as network planning algorithms, traffic controls and their performance analysis, routing algorithms for multiservice and mobile networks and their analysis as well as optimal design, construction and estimation of network load models, performance evaluation of network protocols and components of service architectures, and development of new stochastic models and corresponding analysis methods.

IKR activities
  • Performance evaluation of network components and acrchitectures
  • Traffic modelling
Methods applied
  • Teletraffic theory and engineering
  • Performance evaluation by event-driven simulation using IKRSimLib
Link

https://www.cost.eu/actions/279/#tabs|Name:overview

Wi-QoST: Traffic and QoS Management in Wireless Multimedia Networks
Funding

Public funding
European Commission

Overview and Objectives

The main focus of this COST action are future advanced Multiservice Wireless Networks (MWNs), in particular the traffic nature and behavior and its impact on network achritectures, performance and planning. This includes Quality of Service aspects in both access and core networks.

  • WG1: Traffic Engineering
  • WG2: Mobility and Interoperability
  • WG3: Network Architecture and Planning
  • WG4: Services, Regulations and Economic Aspects
IKR activities
  • Cross-layer issues in future mobile networks
  • Performance impacts of performance enhancing proxies in mobile networks
Methods applied
  • Event-driven simulation using IKRSimLib
  • Teletraffic theory and engineering
Publications

2007

Necker, M.C.
Local Interference Coordination in 802.16e Networks, COST 290 TD(07)008
Proceedings of the 8th COST 290 Management Committee Meeting, Malaga, February 2007
[Show full record]

 
2006

Necker, M.C.
Global Interference Coordination in 802.16e Networks, COST 290 TD(06)46
Proceedings of the 7th COST 290 Management Committee Meeting, Split, September 2006
[Show full record]
 
Necker, M.C.
Scheduling Mechanisms for QoS Differentiation in HSDPA Networks, COST 290 TD(06)015
Proceedings of the 5th COST 290 Management Committee Meeting, Delft, February 2006
[Show full record]

 
2005

Necker, M.C.; Weber, A.
Impact of HSDPA Iub Flow Control on System Performance, COST 290 TD(05)047
Proceedings of the 4th COST 290 Management Committee Meeting, Würzburg, October 2005
[Show full record]
 
Necker, M.C.
A simple model for the IP packet service time in UMTS networks, COST 290 TD(05)014
Proceedings of the 2nd COST 290 Management Committee Meeting, Colmar, February 2005
[Show full record]

 
2004

Necker, M.C.; Scharf, M.; Weber, A.
Performance of TCP and HTTP Proxies in UMTS Networks, COST 290 TD(04)001
Proceedings of the 1st COST 290 Management Committee Meeting, Gozo, October 2004
[Show full record]
Towards Digital Optical Networks
Funding

Public funding
European Commission

Overview and Objectives

The primary objective of this Action is to focus on novel network concepts and architectures exploiting the features and properties of photonic technologies, to enable future telecommunications networks. It is aiming to propose a new generation of systems and networks that will accommodate the unpredictable and growing size of data files and messages exchanged and stored as well as real time services (e.g. voice, video etc) over global distances requiring an agile Communication Grid supporting quality of services.

  • WG1: Optical Processing for digital network perfomance
  • WG2: Novel network architectures
  • WG3: Unified control plane, network resilinence and service security
IKR activities
  • Extensions of GMPLS for routing and signalling in multilayer networks
  • Extensions of GMPLS for routing and signalling in multilayer networks
Methods applied
  • Event-driven simulation using IKRSimLib
  • Teletraffic theory and engineering

 

 

Designing Advanced network Interfaces for the Delivery and Administration of Location independent, Optimised personal Services
Funding

Public funding
European Commission

Overview and Objectives

DAIDALOS (Designing Advanced network Interfaces for the Delivery and Administration of Location independent, Optimised personal Services) is an integrated project of the European Commission's 6th framework. The quick emergence of new access network technologies like WiMax or DVB-x, the advancing convergence of the traditional communication channels ("Triple Play"), the wide spreading of communicating devices and recent advances in context-awareness rise new possibilities for communication systems. As in parallel the operators have to rethink their traditional business models of mainly selling transport capacity, new paradigms can and also must fertilise the communication platforms in order to a) support the users as well as 3rd party service providers best in their needs and b) to assure the operator's benefit over a mid-term perspective. Therefore, Daidalos integrates first of all a broad range of access technologies by a convergent pure IP based approach. In order to provide for a short time to market of new services, the communication platform will be extended to the service layer by closely interconnecting the service and the communication layers and by providing several enablers to be used by consumer services. This platform is to support pervasive services, which will most likely be the future of services by their improved user experience. For this, one emphasis is the management of context information of both, the users and the system itself, which bears inherent privacy problems. Daidalos considers privacy as well as security from the outset in order to yield a viable system to be acceptable by every stakeholder: users, 3rd party service providers and operators.

Daidalos is structured into five operational work packages (WPs). WP1 is defining the overall architecture and scenarios and thus guiding the project in technical terms. WP5 is coordinating integrated demonstrations of the technical WPs 2-4. WP2 is integrating the access networks, while the focus of WP3 is on a service provisioning platform. WP4 is preparing the platform for optimal support of pervasive services by introducing a pervasive service platform. The IKR is active in WP1 and WP4 and involved in the overall architecture design with a focus on security and privacy, in the architecture design of the pervasive service platform, in the privacy support by the pervasive service platform and in AAA questions of pervasive services.

IKR activities
  • WP1 - Global architecture and scenario-based design
    WP1 elaborates requirements and concepts for the overall architecture of the service platform and takes into account inter-WP considerations. IKR activities in WP1 are focused on Security and Privacy and are currently addressing:
    • Identity-Model with support for groups and virtual identities
      The model of virtual identities has to be taken into account across all layers of the communication system in order to provide security and privacy.
    • Security considerations of the overall architecture
      Several operators might be involved in providing a service and are hence subject to attacks. All these threats are evaluated in an attacker model.
    • Overall coordination of the security work in the project
      Security solutions can only work if they are consistently planned and integrated in all parts of the system. Therefore, the different security parts in all WPs have to be coordinated. 
  • WP4 - Pervasive Service Platform and enabling pervasive services
    The intent of WP4 is to extend current telecommunication platforms with their conventional services, like voice and video transmission, towards pervasiveness. Due to the highly dynamic nature of pervasive services and their interaction with the environment, several new challenges appear. Among them are security and privacy questions, which are addressed by the IKR.
    • Privacy
      Interaction with a vast number of context-aware services incorporates the problem of disclosing personal data to different service providers. Consequently, detailed user profiles, which are potentially privacy-invasive, can be established by the service providers. In order to cope with such privacy risks different virtual identities, which resemble restricted views on personal data, are chosen. The goal of this activity is a user-friendly and automatic management of virtual identities.
    • Integration of security concepts in the Runtime Environment
      Authentication, authorisation, accounting, auditing and charging (A4C) are important aspects of pervasive service platforms. Thus, the goal of this activity is to consider and provide basic A4C functionality in the Runtime Environment in order to make the Daidalos Pervasive Service Platform profitable and secure.
Methods applied
  • Security and privacy modelling and engineering
  • Requirements engineering
  • Software engineering
  • Realisation of prototype
  • Performance evaluation
Link

https://www.eurescom.eu/services/management-of-european-rd-projects/past-projects/daidalos.html

 

DynFire - Dynamic Firewalling
Funding

Public funding
German Federal Ministry of Education and Research (BMBF)

Overview and Objectives

The aim of DynFire is the design, implementation and evaluation of a system for dynamic configuration of firewalls. DynFire allows restricting access to network resources on a per-user basis. One of the goals of DynFire is to enable users to get secure access to network-resources independent of their location. Furthermore it must be possible to limit access temporally and restrict it for a certain service usage. Additionally, the concept of DynFire will help to ensure safe operation of network-devices, which cannot comply with current security regulations anymore. In this case the flexibility of a high dynamic firewall configuration serves as protective mechanism. Examples for such network-devices might be CNC-Machines (Computerized Numerical Control) or modern air-conditioning systems. To achieve these objectives, modules are developed which provide automated detection of changing network topologies and support to identify and dynamically configure firewalls.

IKR activities

The IKR is involved in the design, implementation and evaluation of DynFire. In the design phase the IKR identified required modules and components that are involved in the communication needed for a dynamic configuration of firewalls. Furthermore, the IKR contributed to the development of a data model for the management and storage of access rules/policies, topology information and user account information. As a proof of concept prototypes for some modules will be implemented. Within the development process of DynFire, IKR will repeatedly evaluate the current architecture. During this evaluation possible bottlenecks of the system should be identified and if possible the design will be reconsidered based on this analysis.

Methods applied
  • Requirements engineering
  • Architecture design
  • Performance evaluation
  • Prototype implementation
Publications

2011

Vensmer, A.
Legacy Devices and the Future Internet - An Architecture for Dynamic Firewalling
10. Treffen der VDE/ITG-Fachgruppe 5.2.2 "Sicherheit in Netzen", Paderborn, November 2011
[Show full record]
Link

https://www.forschung-it-sicherheit-kommunikationssysteme.de/projekte/dynfire

The European Network of Excellence on Optical Networks
Funding

Public funding
European Commission

Overview and Objectives

The Network of Excellence e-Photon/ONe+ aims at integrating and focusing the rich know-how available in Europe on optical communication and networks, both in universities and in research centres of major telecom manufacturers and operators. This project is built upon the experience gained within the previous NoE e-Photon/ONe.

The main technical aim of the e-Photon/ONe+ is to demonstrate and spread awareness of the potential advantages of optical technologies with respect to electronic technologies in both telecom networks and customer-controlled grids. In a joint effort, the participants of the NoE will work towards a consensus on the engineering choices for the deployment of cost-effective optical technologies as the foundation for the future Internet, with the strong intention to provide valuable inputs to the standardization bodies and guidelines to the operators, as well as competitive feedback to European telecom equipment manufacturers.

IKR activities

The IKR activities in e-Photon/ONe+ are focused on the new network architectures and protocols in the core optical networks. Specifically, they are distributed in the following joint activities and virtual departments of the project programs.

  • JP-B: Optical burst switching
    • Performance evaluation and QoS support in the OBS edge node
    • Dissemination of knowledge
  • JP-G: Optical networking for grids and e-science
    • Investigation of control plane extensions for grid systems
  • JP-S: Electro/optical switching architectures
    • Investigation on future layer 2 switching architectures
  • VD-C: Core Networks: Technologies, Architectures, and Protocols
    • Investigation of multi-layer protection and restoration
    • Dissemination of knowledge
Methods applied
  • Teletraffic theory and engineering
  • Event-driven simulation using IKRSimLib
Publications

2007

Aracil, J.; Akar, N.; Bjoernstad, S.; Casoni, M.; Christodoulopoulos, K.; Careglio, D.; Fdez-Palacios, J.; Gauger, C.M.; Gonzalez de Dios, O.; Hu, G.; Karasan, E.; Klinkowski, M.; Morato, D.; Nejabati, R.; Overby, H.; Raffaelli, C.; Simeonidou, D.; Stol, N.; Tosi-Beleffi, G.; Vlachos, K.
Research in Optical Burst Switching within the e-Photon/ONe Network of Excellence
Optical Switching and Networking, Vol. 4, No. 1, February 2007, pp. 1-19
[Show full record]
 
Hernandez, J.A.; Hu, G.; Aracil, J.
Analysis of IP delay variation in edge OBS nodes
Proceedings of the 12th European Conference on Networks and Optical Communications (NOC2007), Stockholm, June 2007
[Show full record]
 
Gunreben, S.; Hu, G.
A Multi-layer Analysis on Reordering in Optical Burst Switched Networks
IEEE Communication Letters, Vol. 11, No. 12, December 2007
[Show full record]
 
Gunreben, S.
Multi-layer Analysis to Quantify the Impact of Optical Burst Reordering on TCP Performance
Proceedings of the 9th International Conference on Transparent Optical Networks (ICTON 2007), Rome, July 2007
[Show full record]


2006

Gauger, C.M.; Kühn, P.J.; Breusegem, E.V.; Pickavet, M.; Demeester, P.
Hybrid optical network architectures: bringing packets and circuits together
IEEE Communications Magazine, Vol. 44, No. 8, August 2006, pp. 36-42
[Show full record]
 
Gunreben, S.; Spadaro, S.; Sole-Pareta, J.
A Unified Model for Bandwidth Adaptation in Next Generation Transport Networks
Proceedings of the 1st IEEE International Workshop on Bandwidth on Demand, BoD 2006 in conjunction with the 49th IEEE GLOBECOM 2006, San Francisco, CA, November 2006
[Show full record]
 
Hu, G.
Performance Model for a Lossless Edge Node of OBS Networks
Proceedings of the 49th IEEE GLOBECOM Technical Conference and IEEE COMMUNICATIONS EXPO Featuring ACCESS '06, San Francisco, CA, November 2006
[Show full record]
 
Köhn, M.; Hu, G.
Evaluation of Packet Delay in OBS Edge Nodes
Proceedings of the 8th International Conference on Transparent Optical Networks (ICTON 2006), Nottingham, June 2006
[Show full record]
Link

https://www.photonics.ntua.gr/portfolio-posts/e-photon-one/

Flexible Realisation of Network Nodes
Funding

Public funding
German Federal Ministry of Education and Research (BMBF)

Overview and Objectives

This research project is part of the BMBF-funded framework Eibone (Efficient Integrated Backbone). The objective of all projects within this framework is the exploration and development of an efficient, flexible, robust and reliable communication network, fulfilling the bandwidth and service requirements of the 21st century society. The main focus of Eibone is concentrated on backbone networks, i.e., the metro and core networks of a future broadband communication network.

IKR activities

The project FlexRN together with Eibone KOMMT forms IKR's joint project within the Eibone framework. FlexRN addresses unsolved questions concerning the realization of network components like linecards based on network processors and Field Programmable Gate Arrays (FPGA). New flexible architectures are important factors for the manufacturers' success. They must support easy and flexible integration of new standards and functionalities. Further, the duration of the development cycles must be reduced.

The research topics can be divided into the analysis of functionalities and platforms of metro and core network nodes in cooperation with industrial partners, the design of a generic architecture for the implementation of flexible network nodes and the finding of concepts to evaluate realizations of network nodes in an early stage. These topics are accomplished by the following activities:

  • Analysis of current and future metro/core node functionalities
  • Classification and comparison of architecture and programming aspects of commercial network processors
  • Prototypical implementations of certain network node functionalities on FPGAs and network processors
  • Design of an architecture and generic modules for flexible network node functionalities
  • Development of concepts for early estimations of the implementation complexity and performance of FPGA and network processor solutions

All research activities are performed in close interaction with partners from industry and academia within the Eibone framework.

Methods applied
  • Hardware design, modeling and simulation using VHDL
  • Prototypical implementation on FPGAs and network processors
Student Projects

Design and Implementation the TCP Quick-Start Extension for a Router based on a Network Processor
(Master thesis No. 629, Finished)

Entwurf und Realisierung einer CAM-Erweiterungskarte mit zugehörigem VHDL-Logikmodul für die Universelle Hardware-Plattform
(Bachelor thesis No. 585, Finished)

Entwurf und Realisierung eines generischen DDR-SDRAM Speicher-Controllers in VHDL
(Master thesis No. 581, Finished)

Entwurf und Realisierung eines Management-Systems in VHDL
(Bachelor thesis No. 556, Finished)

Realisierung einer konfigurierbaren Bedienoberfläche für ein Management-System in Java
(Bachelor thesis No. 555, Finished)

Erweiterung und Überarbeitung der hochauflösenden Messumgebung für Gigabit-Ethernet "I2MP"
(Master thesis No. 541, Finished)

Entwurf und Realisierung eines generischen Verkehrsgenerators in VHDL
(Bachelor thesis No. 527, Finished)

Entwicklung einer Testumgebung für Netzwerkprozessoren
(Master thesis No. 480, Finished)

Publications

2006

Hauger, S.; Junghans, S.; Köhn, M.; Sass, D.
A Scalable Architecture for Flexible High-Speed Packet Classification
Report, IKR, Universität Stuttgart, Stuttgart, Germany, December 2006
[Show full record]
 
Hauger, S.; Junghans, S.; Mutter, A.; Sass, D.
A Flexible Microprogrammed Packet Classifier for Edge Nodes of Transport Networks
Beiträge zur 7. ITG-Fachtagung Photonische Netze, Leipzig, April 2006
[Show full record]
 
Kögel, J.; Hauger, S.; Junghans, S.; Köhn, M.; Necker, M.C.; Stanchina, S.
Design and Evaluation of a Burst Assembly Unit for Optical Burst Switching on a Network Processor
EUNICE 2005: Networks and Applications Towards a Ubiquitously Connected World, Springer, Germany, July 2006
[Show full record]


2005

Kögel, J.; Hauger, S.; Junghans, S.; Köhn, M.; Necker, M.C.; Stanchina, S.
Design and Evaluation of a Burst Assembly Unit for Optical Burst Switching on a Network Processor
Proceedings of the 11th Open European Summer School and IFIP WG 6.6, WG 6.4, WG 6.9 Workshop (EUNICE 2005), Colmenarejo, Madrid, July 2005
[Show full record]
Concepts, Methods and Algorithms for Multilayer Transport Networks
Funding

Public funding
German Federal Ministry of Education and Research (BMBF)

Overview and Objectives

This research project is part of the BMBF-funded framework Eibone (Efficient Integrated Backbone). The objective of all projects within this framework is the exploration and development of an efficient, flexible, robust and reliable communication network, fulfilling the bandwidth and service requirements of the 21st century society. The main focus of Eibone is concentrated on backbone networks, i.e., the metro and core networks of a future broadband communication network.

IKR activities

The project KOMMT together with FlexRN forms IKR's joint project within the Eibone framework. The main objective of KOMMT is to design and evaluate algorithms for survivable multi-layer transport networks under dynamic traffic. Hereby, especially network dimensioning and traffic management schemes are adressed, which will be investigated for new traffic models, that reflect the characteristics of future core network services. In detail, the following topics will be addressed:

  • Traffic and according services determine the requirements on future core networks. Both will be analyzed and appropriate models derived.
  • Failures in hardware as well as network configuration can not be neglected. Their sources will be analyzed with respect to their impact on the network and according models derived in order to support the development of concepts to overcome the failure.
  • Mechanisms for the closely interconnected tasks network dimensioning and traffic management will be developed and evaluated by simulation focusing survivability.
  • The traffic volume is still growing fast, strategies for upgrading of networks are required and will be developed and investigated.
Methods applied
  • Teletraffic theory and engineering
  • Event-driven simulation using IKRSimLib
  • Statistics
Student projects

Entwurf und Implementierung eines Werkzeuges zur Dimensionierung von Kernnetzen
(Bachelor thesis No. 580, Finished)

Economics and Technologies for Inter-Carrier Services
Funding

Public funding
European Commission

Overview and Objectives

ETICS (Economics and Technologies for Inter-Carrier Services) is a European collaborative research project within the ICT theme of the 7th Framework Programme of the European Union that contributes to the objective "Network of the Future". ETICS aims to build a sustainable ecosystem that supports end-to-end Quality of Service guarantees based on interconnection models between Network Service Providers allowing for a fair distribution of revenue shares among all the actors of the service delivery value-chain. To achieve these objectives, ETICS addresses issues in interconnecting network architectures both economically and technically:

  • Technically - ETICS will analyses, specify and implement new network control, management and service plane technologies for the automated end-to-end QoS-enabled service delivery across heterogeneous carrier networks.
  • Economically - ETICS will develop new network service creation, activation, monitoring and billing models for interconnected fixed and mobile operators that will improve time to market of new services and reduce operational costs and complexity.
IKR activities
  • Characterisation of multi-carrier network performance
    A critical aspect for a multi-carrier QoS interconnect framework is the characterisation and measurement of end-to-end network performance. This work analyses current test methodology and invests potential advancements based on measurement methods that are able to identify the conditions of congestion.
  • Accountability Framework for ETICS architectures based on ConEx
    The Quality of Service interconnect framework delivered within ETICS will enable superior performance on the quality of network interconnects. In order to address this aspect the IKR focuses on the design of an advanced congestion management technique driven at the costumer-end of the communication and investigates its potential benefits on network performance. These investigations will be based on an accountability framework using Congestion Exposure (ConEx) information.
Methods applied
  • Protocol engineering
  • Kernel implementation (Linux)
  • Performance evaluation in simulations
Link

https://cordis.europa.eu/project/rcn/93071/factsheet/fr

Architectures and QoS for opto-electronic burst switching networks
Funding

Public funding
German Federal Ministry of Education and Research (BMBF)

Overview and Objectives

This project aims at the development of a cost-effective solution for the future optical IP network by the introduction of a novel opto-electronic burst switching technology. It transports both SDH signals as well as signals of data clients (e.g. IP, Ethernet, ...) in standardized G.709 frames as the data transport unit.

At the edge of a Frame Switching network, SDH signals are mapped into such frames while signals of data clients are first aggregated (i.e. different traffic flows are combined based on destination, QoS requirements, ...) and then assembled into frames. Frames are scheduled onto permanent or semi-permanent lightpaths and switched in Frame Switching core nodes.

This architecture provides promising feasibility, scalability and interoperability as well as multi-service support.

IKR activities

The contribution in this project is focused on the architectural design studies and performance analysis. Following research issues are concerned:

  • Investigation of the overall network architecture
  • Performance evaluation and QoS support in the edge node
  • Schemes for traffic engineering and network dimensioning
  • Development of control plane functions and integration into current control plane architectures

This project is complemented by the project Realization of Frame Switching, in which realization related aspects of the Frame Switching architecture are investigated as well as an edge node is implemented.

Methods applied
  • Teletraffic theory and engineering
  • Effective bandwidth theory
  • Event-driven simulation using IKRSimLib
Student projects

Dimensionierung von FrameSwitching Netzen
(Master thesis No. 575, Finished)

Simulative Untersuchung von Scheduling-Verfahren im WDM-Metronetz
(Bachelor thesis No. 461, Finished)

Scheduling of aggregated traffic in IP-over-photonic edge nodes
(Master thesis No. 435, Finished)

 

G-Lab - Control and Management of Coexisting Networks
Funding

Public funding
German Federal Ministry of Education and Research (BMBF)

Overview and Objectives

The German Lab (G-Lab) project started in October 2008. It provides a Germany-wide experimental facility. The facility consists of over 175 interconnected computing nodes. Several subprojects use this facility to evaluate new ideas and approaches for future networks.

The COMCON subproject is focused on control and management of virtual networks, including virtual network setup, operation, and teardown. Virtual networks consist of virtual resources, e.g. virtual nodes (switches, routers) and virtual links. These virtual resources are realized by segmentation of physical resources.

For dynamic creation and operation of virtual networks, existing architectures for network control and management have to be extended and redesigned. In addition, the COMCON project considers new business models, which emerge due to network virtualization.

IKR activities
  • Network control
    The design of a control plane for network virtualization is an open issue. Currently, control planes are used for automatization of basic network housekeeping tasks such as topology discovery or tracking of resource utilization. As these tasks are still necessary when a physical network is split up into virtual networks, we evaluate existing control plane concepts and specify extensions for virtualization support.
  • Prototypic implementation
    We prototypically implement the specified extensions as proof-of-concept and for evaluation within the GLab experimental facility. In particular, we extend a Generalized Multi-Protocol Label Switching (GMPLS) control plane with selected extensions.
Methods applied
  • Requirements engineering
  • Network architecture design
  • Prototypic implementation
  • Performance evaluation
Publications

2010

Meier, S.; Scharf, J.; Gunreben, S.
The Resource Reservation Protocol for New Network Concepts
BONE-Celtic Tiger2 Summer School 2010, Budapest, September 2010
[Show full record]
Project Website

https://www.german-lab.de/

G-Lab - Control and Management of Coexisting Networks (UA)
Funding

Privat funding

Overview and Objectives

The German Lab (G-Lab) project started in October 2008. It provides a Germany-wide experimental facility. The facility consists of over 175 interconnected computing nodes. Several subprojects use this facility to evaluate new ideas and approaches for future networks.

The COMCON project is focused on control and management of virtual networks, including virtual network setup, operation, and teardown. Virtual networks consist of virtual resources, e.g. virtual nodes (switches, routers) and virtual links. As depicted, these virtual resources are hosted by physical resources.

For dynamic creation and allocation of virtual networks, current architectures for network control and management have to be extended and redesigned. In addition COMCON project considers new business models, which emerge due to network virtualization.

IKR activities
  • Definition of a reference architecture for network virtualization
    Current network architectures have to be extended to support network network virtualization. This includes among others the definition of interfaces for requesting virtual resources and new protocols for instantiation and subsequent management of virtual resources within the physical infrastructure. Furthermore, virtual resources such as routers require configuration, thus interfaces and protocols for virtual resource monitoring and configuration have to be defined. The resulting reference architecture for network interfaces defines all required interfaces, building blocks and protocols.
    Additionally, the reference architecture takes new business models with new functional roles into account. Our reference architecture for network virtualization will support these functional roles and will provide required interfaces for interaction between these roles.
  • Setup and Operation Experimental facility
    We contribute to the maintenance, development and extension of the German-wide experimental facility by operating own computing nodes. This allows us to evaluate prototypic implementations of relevant parts of the reference architecture and control plane.
Methods applied
  • Requirements engineering
  • Network architecture design
  • Performance evaluation
Project Website

https://www.german-lab.de/

 

Hardware Supported Real-Time Garbage Collection
Funding

No external funding

Publications

2010

Horvath, O.; Meyer, M.
Fine-Grained Parallel Compacting Garbage Collection through Hardware-Supported Synchronization
5th International Symposium on Embedded Multicore SoCs, San Diego, 2010
[Show full record]


2007

Stanchina, S.; Meyer, M.
Mark-Sweep or Copying? A 'Best of Both Worlds' Algorithm and a Hardware-Supported Real-Time Implementation
Proceedings of the 2007 International Symposium on Memory Management, Montreal, October 2007
[Show full record]
 
Stanchina, S.; Meyer, M.
Exploiting the Efficiency of Generational Algorithms for Hardware-Supported Real-Time Garbage Collection
Proceedings of the 22nd ACM Symposium on Applied Computing, SAC 2007, Seoul, March 2007
[Show full record]

 
2006

Meyer, M.
A True Hardware Read Barrier
Proceedings of the 2006 International Symposium on Memory Management, Ottawa, Ontario, June 2006, pp. 3-16
[Show full record]

 
2005

Meyer, M.
An On-Chip Garbage Collection Coprocessor for Embedded Real-Time Systems
Proceedings of the 11th IEEE International Conference on Embedded and Real-Time Computing Systems and Applications, Hong Kong, August 2005, pp. 517-524
[Show full record]

 
2004

Meyer, M.
A Novel Processor Architecture with Exact Tag-Free Pointers
IEEE Micro, Vol. 24, No. 3, May 2004, pp. 46-55
[Show full record]

 
2003

Meyer, M.
A Novel Processor Architecture with Exact Tag-Free Pointers
Proceedings of the 2nd Workshop on Application Specific Processors, San Diego, California, December 2003, pp. 96-103
[Show full record]
Student projects

Entwurf eines DVI-Grafikadapters für ein experimentelles RISC-System in VHDL und seine Realisierung mit Hilfe von SDRAM-Speicherbausteinen und programmierbarer Logik
(Master thesis No. 356, Finished)

Entwurf und Implementierung einer Java-Laufzeitumgebung für ein experimentelles Rechnersystem
(Master thesis No. 371, Finished)

Implementierung eines Dateisystems für ein experimentelles Rechnersystem.
(Bachelor thesis No. 433, Finished)

Entwurf und Realisierung eines mathematischen Coprozessors für ein experimentelles Rechnersystem
(Master thesis No. 475, Finished)

Realisierung einer Multi-Threaded Laufzeitumgebung für ein experimentelles Rechnersystem
(Master thesis No. 476, Finished)

Entwurf und Implementierung eines Assemblers für ein experimentelles Rechnersystem in Java
(Master thesis No. 477, Finished)

Entwurf und Realisierung eines Speichercontrollers für ein experimentelles Rechnersystem
(Master thesis No. 511, Finished)

Entwurf und Realisierung eines echtzeitfähigen Multithreading-Konzeptes für die Laufzeitumgebung eines experimentellen Rechnersystems
(Master thesis No. 637, Finished)

Multi-Access Modular-Services Framework
Funding

Public funding
German Federal Ministry of Education and Research (BMBF)

Overview and Objectives

MAMS (Multi-Access, Modular-Services Framework) is a publicly funded project of the German Federal Ministry of Education and Research (BMBF). The main objective of the MAMS project is the design and development of a simple, efficient, and future-proof creation environment for present and future community services. It aims at supporting small and medium-sized enterprises with no communication expertise by providing sophisticated communication-oriented community services based on typical building blocks, like portals, content delivery, customer care, billing, etc.

These building blocks are divided further into basic enabling services, which are instantiated, coordinated, and executed in the service execution environment of an intelligent service oriented network infrastructure (ISONI) forming a flexible service delivery platform. This platform allows the secure integration of distibuted service-specific overlays with end-devices and network, communication, and computation resources.

The project is divided into 8 different work packages (APs).

  • AP100 - System Design
  • AP200 - Scenarios and Evaluation of Business Aspects
  • AP300 - Service Engineering and Service Creation Environment
  • AP400 - Open Distributed Service Delivery Platform
  • AP500 - Network Abstraction and Open IMS
  • AP600 - Intelligent Service Oriented Network Infrastructure
  • AP700 - Transfer of Results
  • AP800 - Testbed and Show Cases

The IKR is subcontractor of a large telecommunication equipment vendor responsible for AP600. It focuses on resource and service description, distributed service management, and fault-tolerance.

IKR activities

The IKR is involved in AP600 contributing to

  • Architectural design of the distributed middleware integrating all components of the ISONI
  • Development of generic service and resource descriptions including the possibility for composing high-level services out of a set of already established basic services
  • Fault-tolerant execution environment taking the different basic resources into account; resources include classical network resources (bandwidth, delay), typical grid resources (processing power, storage), as well as specialized resources (specific hardware implementations)
  • Evaluation of design alternatives, mainly with respect to fault-tolerance
Methods applied
  • Architecture design 
  • Prototypical implementation
  • Simulation
Publications

2009

Reifert, A.
Service Placement in Network-aware Cloud Infrastructures
9th Würzburg Workshop on IP: Joint ITG and Euro-NF Workshop "Visions of Future Generation Networks", Würzburg, July 2009
[Show full record]
 
Reifert, A.
Automatisierte Ressourcenplanung in dienstorientierten Netzinfrastrukturen
Workshop der Fachgruppe 5.2.1: "Network Resource Allocation", Chemnitz, March 2009
[Show full record]

 
2008

Kessler, M.; Reifert, A.; Lamp, D.; Voith, T.
A Service-Oriented Infrastructure for Providing Virtualized Networks
Bell Labs Technical Journal, Vol. 13, No. 3, 2008, pp. 111-127
[Show full record]
Student projects

Entwicklung von Konzepten zu Ressourcen-Sharing in ausfallsicheren verteilten Systemen am Beispiel des Reliable Server Pooling Protokolls
(Master thesis No. 641, (none))

Design and Realization of Resilient Containers for Communication Services in Modern Communication Networks
(Master thesis No. 627, (none))

Design and Realization of a Decentralized Directory Service for Web Services in a Dynamic Environment
(Mini project No. 626, Finished)

Analysis of Service Discovery and Service Distribution Mechanisms in Service Delivery Platforms
(Master thesis No. 614, Finished)

Mapping of Resource and Service Descriptions in Peer-to-Peer Service Distribution Networks
(Master thesis No. 613, Finished)

Eignung gridbasierter Mechanismen in Telekommunikationsnetzen der nächsten Generation
(Bachelor thesis No. 546, Finished)

Design and Implementation of Service Discovery and Distribution Mechanisms in Peer-to-Peer Service-Networks
(Master thesis No. 545, Finished)

Link

https://www.fokus.fraunhofer.de/59567397cd65aebe

Context-Aware Communication Control
Funding

Public funding
German Research Foundation (DFG)

Overview

The research project "communication platform" is a part of Nexus , a Center of Excellence at the University of Stuttgart. The Center of Excellence is now in the second funding period.

Reserach project A1 in Nexus

Complex context-aware applications impose stringent requirements on the communication infrastructure with respect to bandwidth and Quality of Service. There is a latent time- and location-variant discrepancy between these requirements and the capabilities of heterogeneous mobile communication networks. Applications such as the visualization of spatial-world model information on mobile handsets must be adaptive in order to compensate for these differences. Consequently, a comprehensive control of adaptation mechanisms spanning different protocol layers and application instances is required. Therefore, one focus of this sub-project is to develop supporting methods for adaptive Nexus applications. This includes approaches for network-based mediation of spatial-world model data and approaches for adaptive communication patterns. The evaluation of the interaction with Nexus applications is realized in collaboration with other sub-projects working on Nexus applications.

The second focus of the sub-project is a cross-layer and cross-application adaptation control and orchestration. Adaptation decisions can be significantly improved using high-quality context information that is available in world models. In addition to cell coverage areas stored in the Nexus world model, context information related to individual users is of particular interest, since this allows to predict future network connectivity and user needs. An example for such context information is the location of users in combination with movement prediction, which is obtained from navigation components in the Nexus world model. Moreover, past usage scenarios, information about current activities and (price) preferences can be considered, too. To process such context information, the sub-project applies methods developed by other projects within the center of excellence (diffuse information, detection of situations, etc.).

Further information

Project: Nexus - Spatial World Models for Mobile Context-Aware Applications

Publications

2007

Scharf, M.; Zeeh, C.
Experience with Simulating Real TCP/IP-Protocol Stacks
Beiträge zum Treffen der VDE/ITG-Fachgruppe 5.2.1 Workshop 'Network Engineering', Essen, November 2007
[Show full record]
 
Scharf, M.
Future Internet Transport Layer - Heading towards a Post-TCP Era?
Future Internet Design Workshop, 33rd European Conference and Exhibition on Optical Communication (ECOC 2007), Berlin, September 2007
[Show full record]
 
Welzl, M.; Papadimitriou, D.; Scharf, M.
Open Research Issues in Internet Congestion Control: draft-irtf-iccrg-welzl-congestion-control-open-research-00.txt
Report, Submitted as Internet-Draft to the Internet Research Task Force (IRTF), July 2007
[Show full record]
 
Scharf, M.
Performance Analysis of the Quick-Start TCP Extension
Proceedings of the 4th International Conference on Broadband Communications, Networks and Systems, IEEE BROADNETS 2007, Raleigh, NC, September 2007
[Show full record]
 
Scharf, M.; Strotbek, H.
Experiences with Implementing Quick-Start in the Linux Kernel
69th IETF Meeting, TSVAREA Session, Chicago, IL, July 2007
[Show full record]
 
Scharf, M.; Floyd, S.; Sarolathi, P.
Avoiding Interactions of Quick-Start TCP and Flow Control: draft-scharf-tsvwg-quick-start-flow-control-01.txt
Report, Submitted as Internet-Draft to the Internet Engineering Task Force (IETF), July 2007
[Show full record]
 
Wanke, S.; Scharf, M.; Kiesel, S.; Wahl, S.
Measurement of the SIP Parsing Performance in the SIP Express Router
Proceedings of the 13th Open European Summer School and IFIP TC6.6 Workshop (EUNICE 2007), Enschede, July 2007, pp. 103-110
[Show full record]
 
Scharf, M.; Floyd, S.; Sarolathi, P.
Avoiding Interactions of Quick-Start TCP and Flow Control: draft-scharf-tsvwg-quick-start-flow-control-00.txt
Report, Submitted as Internet-Draft to the Internet Engineering Task Force (IETF), February 2007
[Show full record]
 
Scharf, M.
Quick-Start TCP: Performance Evaluation and Open Issues, COST 290 TD(07)013
Proceedings of the 8th COST 290 Management Committee Meeting, Malaga, February 2007
[Show full record]
 
Müller, C.M.; Blume, O.
Network-based mobility with Proxy Mobile IPv6
Proceedings of the 18th Annual IEEE International Symposium on Personal, Indoor and Mobile Radio Communications (PIMRC 2007), Athens, September 2007
[Show full record]
 
Müller, C.M.
IEEE 802.21 and its usage as an access network discovery database
Beträge zum 23. Treffen der VDE/ITG-Fachgruppe 5.2.4 Mobilität in IP-basierten Netzen, Workshop zum Thema 'Netzdatenbanken', Berlin, May 2007
[Show full record]
 
Kiesel, S.; Scharf, M.
Modeling and performance evaluation of transport protocols for firewall control
Computer Networks (ComNet) 2007, Vol. 51, No. 11, August 2007, pp. 3232-3251
[Show full record]
 
Gloss, B.
System Architecture of a Mobile Message Transport System
International Journal of Internet Protocol Technology (IJIPT) 2007, Vol. 2, No. 2, April 2007, pp. 79-87
[Show full record]

 
2006

Kühn, P.J.
Multiskalen-Simulation - Versuch einer Systematik der Methoden und Ansätze auf dem Gebiet der Verkehrssimulation
Workshop Simulation, ITG-FG 5.2.1, Bremen, November 2006
[Show full record]
 
Rothermel, K.; Ertl, T.; Fritsch, D.; Kühn, P.J.; Mitschang, B.; Westkämper, E.; Becker, C.; Dudkowski, D.; Gutscher, A.; Hauser, C.; Jendoubi, L.; Nicklas, D.; Volz, S.; Wieland, M.
SFB 627 ­ Umgebungsmodelle für mobile kontextbezogene Systeme
Informatik - Forschung und Entwicklung, Vol. 21, No. 1-2, October 2006, pp. 105-113
[Show full record]
 
Scharf, M.; Necker, M.C.; Gauger, C.M.; Gloss, B.; Hauser, C.; Jähnert, J.; Kiesel, S.; Köhn, M.; Kühn, P.J.; Reifert, A.; Sass, D.
To Session or not to Session - Session Concepts in Currently Emerging Future Networks
6th Würzburg Workshop on IP: 'Visions of Future Generation Networks', Würzburg, August 2006
[Show full record]
 
Scharf, M.; Kiesel, S.
Head-of-line Blocking in TCP and SCTP: Analysis and Measurements
Proceedings of the IEEE GLOBECOM 2006, San Francisco, California, November 2006
[Show full record]
 
Kiesel, S.; Scharf, M.; Beutel, S.; Ruschival, T.
Performance Measurement of SIMCO over TCP and SCTP
Report, IKR, Universität Stuttgart, July 2006
[Show full record]
 
Gloss, B.
Modeling Resource Fluctuations for Adaptive Communications in Mobile Environments
Proceedings of the 17th ITC Specialist Seminar on Teletraffic Engineering Challenges for Next Generation Mobile Networks, Melbourne, May 2006
[Show full record]
 
Gloss, B.
Mobilitätsmodellbasierte Ressourcenmodellierung für Heterogene Umgebungen
ITG FG 5.2.1/FG 5.2.4, Workshop 'Mobilitätsmodelle + (vertical) Handover', München, March 2006
[Show full record]
 
Gloss, B.
Non-Stationarity of Walker Movability in Random Walk Mobility Models
Report, IKR, Universität Stuttgart, March 2006
[Show full record]
 
Lück, S.
Acquisition, Storage, and Provision of Access Network Information with Nexus
1st Akogrimo Public Workshop, Stuttgart, March 2006
[Show full record]
 
Kiesel, S.; Scharf, M.
Modeling and Performance Evaluation of SCTP as Transport Protocol for Firewall Control
Proceedings of the IFIP International Conference on Networking 2006, Coimbra, May 2006
[Show full record]
 
Gloss, B.; Scharf, M.; Neubauer, D.
Location-Dependent Parameterization of a Random Direction Mobility Model
Proceedings of the 63rd IEEE Vehicular Technology Conference (VTC 2006-Spring), Melbourne, May 2006
[Show full record]

 
2005

Gloss, B.; Scharf, M.; Neubauer, D.
A More Realistic Random Direction Mobility Model, COST 290 TD(05)052
Proceedings of the 4th COST 290 Management Committee Meeting, Würzburg, October 2005
[Show full record]
 
Lück, S.
Eine Architektur zur Erfassung und Bereitstellung von Netzabdeckungen von Hotspots
15. Treffen der VDE/ITG-Fachgruppe 5.2.4 Mobilität in IP-basierten Netzen mit dem Workshop 'Vertical Handover - Providing Intersystem Mobility for Heterogeneous Networks', Aachen, September 2005, Aachen, September 2005
[Show full record]
 
Kiesel, S.; Scharf, M.
Evaluation of SCTP as transport layer protocol for firewall control
Workshop 'Neue Herausforderungen in der Netzsicherheit' an der Universität Duisburg-Essen, Essen, October 2005
[Show full record]
 
Scharf, M.
Skalierbarkeit einer Plattform für föderierte ortsbezogene Dienste
14. Treffen der VDE/ITG-Fachgruppe 5.2.4 Mobilität in IP-basierten Netzen mit dem Workshop 'Location awareness in communications: Technologies, applications and security aspects', Stuttgart, Juni 2005, Stuttgart, June 2005
[Show full record]
 
Scharf, M.
On the Response Time of Large-scale Composite Web Services
Proceedings of the 19th International Teletraffic Congress (ITC 19), Beijing, August 2005
[Show full record]
 
Lück, S.; Scharf, M.; Gil, J.
An Architecture for Acquisition and Provision of Hotspot Coverage Information
Proceedings of the 11th European Wireless 2005 (EW 2005), Nicosia, April 2005, pp. 287-293
[Show full record]
 
Kühn, P.J.
Entwicklungen zum Next Generation Network (NGN)
Fachzeitschrift Praxis der Informationsverarbeitung und Kommunikation, Vol. 28, No. 1, January 2005, pp. 9-14
[Show full record]
 
Necker, M.C.; Scharf, M.; Weber, A.
Performance of TCP and HTTP Proxies in UMTS Networks
Proceedings of the 11th European Wireless 2005 (EW 2005), Nicosia, April 2005, pp. 504-513
[Show full record]

 
2004

Necker, M.C.; Scharf, M.; Weber, A.
Performance of Different Proxy Concepts in UMTS Networks
Proceedings of the First International Workshop of the EURO-NGI Network of Excellence, Lecture Notes in Computer Science (LNCS) 3427, Dagstuhl Castle, June 2004, pp. 36-51
[Show full record]
 
Necker, M.C.; Scharf, M.; Weber, A.
Performance of TCP and HTTP Proxies in UMTS Networks, COST 290 TD(04)001
Proceedings of the 1st COST 290 Management Committee Meeting, Gozo, October 2004
[Show full record]
 
Kühn, P.J.
Locations-Based Services in Mobile Communication Infrastructures
AEÜ International Journal of Electronics and Communications, Vol. 58, March 2004, pp. 159-164
[Show full record]
 
Lück, S.; Gutscher, A.
Improving Access Discovery by Analysing World-Model Information
Ortsbezogene Anwendungen und Dienste, Fachgespräch der GI-Fachgruppe KuVS, Hagen, June 2004
[Show full record]
 
Scharf, M.; Necker, M.C.; Gloss, B.
The Sensitivity of TCP to Sudden Delay Variations in Mobile Networks
Proceedings of the 3rd IFIP-TC6 Networking Conference, Lecture Notes in Computer Science (LNCS) 3042, Athens, May 2004, pp. 76-87
[Show full record]
 
Scharf, M.
The Impact of Delay Variations on TCP Performance
Proceedings of the 2nd Workshop on Modeling and Optimization in Mobile, Ad hoc and Wireless Networks (WiOpt '04), Cambridge, March 2004, pp. 419-420
[Show full record]
 
Scharf, M.
The Impact of Delay Variations on TCP Performance
ITG Fachgruppe 5.2.1 Workshop, Hamburg, February 2004
[Show full record]

 
2003

Kühn, P.J.
Location Based Services in Mobile Communication Infrastructures
Proceedings of the Australian Telecommunications Networks and Applications Conference (ATNAC '03), Melborn, December 2003
[Show full record]
 
Rothermel, K.; Fritsch, D.; Kühn, P.J.; Mitschang, B.; Bauer, M.; Becker, C.; Hauser, C.; Nicklas, D.; Volz, S.
SFB627 Umgebungsmodelle für mobile kontextbezogene Systeme
Beiträge zur Informatik 2003 Innovative Informatikanwendungen, Frankfurt/Main, September 2003, pp. 103-115
[Show full record]
Student projects

Untersuchung und Anwendung von Verfahren zur Bandbreitenschätzung in Mobilkommunikationssystemen
(Bachelor thesis No. 624, Finished)

Untersuchung von NSIS als Signalisierprotokoll in heterogenen Mobilkommunikationssystemen
(Bachelor thesis No. 619, Finished)

Design and Implementation of a TCP Extension in the Linux Kernel
(Master thesis No. 617, Finished)

Untersuchung und Optimierung der Leistung von SIP-Protokollstapeln
(Bachelor thesis No. 596, Finished)

Design and Implementation of a MIME Parser and MIME Document Model
(Bachelor thesis No. 577, Finished)

Integration of the Linux TCP/IP protocol stack in an event-driven simulation environment
(Master thesis No. 572, Finished)

Verkehrscharakterisierung verteilter geographischer Informationssysteme
(Bachelor thesis No. 562, Finished)

Design and Implementation of Software for Processing of Signal Strength Values of Radio Cells
(Master thesis No. 558, Finished)

Evaluation of algorithms to calculate radio cell coverage information from measured signal strength values
(Master thesis No. 557, Finished)

Evaluation of Mechanisms for the Adaptive transmission of XML Documents in Mobile Networks
(Master thesis No. 554, Finished)

Pagingverfahren in heterogenen Zugangsnetzen
(Bachelor thesis No. 536, Finished)

Design and Implementation of a transport protocol for a mobility and adaptation supporting middleware component
(Bachelor thesis No. 522, Finished)

Design and Implementation of a control unit for a mobility and adaptation supporting middleware component
(Bachelor thesis No. 521, Finished)

Integration von GPRS in ein IPv6-Testbed
(Bachelor thesis No. 490, Finished)

Evaluierung und Parametrisierung von statistischen Nutzerbewegungsmodellen
(Master thesis No. 489, Finished)

Evaluation and Optimization of the TCP Round Trip Time Estimation in Mobile Networks
(Master thesis No. 479, Finished)

Entwurf und Implementierung eines HTTP-Server-/HTTP-Relay-Moduls für eine Internet-basierte Middlewarekomponente zur Mobilitätsunterstützung mobiler Teilnehmer
(Bachelor thesis No. 474, Finished)

Untersuchung von Verfahren zur Berechnung von Zellgeometrien aus Messungen der Signalstärke
(Master thesis No. 469, Finished)

Modelling and Performance Evaluation of Peer-to-Peer Networks for the unstructured Search in Heterogeneous Environments
(Master thesis No. 466, Finished)

 

Security, Privacy and Accounting in Context-aware Systems
Funding

Public funding
German Research Foundation (DFG)

Overview

The research project "security and privacy" is a part of Nexus , a Center of Excellence at the University of Stuttgart. The Center of Excellence is now in the second funding period.

Research project A3 in Nexus

Services and applications relying on the use of comprehensive spatial world models and thus also on the use of personal data affect sensitive private domains and raise therefore far-reaching security and acceptability questions. The involved parties impose different requirements: From the users' point of view it is crucial to protect personal data from unauthorized use. From the point of view of service operators and information providers it is of most interest to ensure the feasibility to account for the use of their services and to protect them against unauthorized access. This research project will therefore investigate solutions for open future service platforms which address these conflictive needs of users, providers and operators. The two identified main topics, security and privacy on the one hand as well as the enabling of accounting on the other hand are intimately connected with respect of content and methods. These topics have to be researched in close cooperation in order to develop multilateral security concepts for context-aware services. The development of technical solution will also identify potential regulatory or legal need for action.

Subject of the first main topic is the enhancement of security and privacy protection mechanisms that have been developed and implemented initially statically in the first funding period. The aim is to construct a security framework that dynamically adapts to the context of the users and to the changing roles of the parties involved. On the one hand, the information in the spatial world model has to be protected, but on the other hand, it should also be possible to use it as input for security mechanisms. Thus, fine-grained, context-aware and trust-dependent access control mechanism are developed in order to protect the model data against unauthorized use. The deployment of distributed reputation systems will ensure that mechanisms and services will remain accessible even if not all involved users, service providers and operators are considered trustworthy or if there is limited cooperation amongst them.

Subject of the second main topic is the development and investigation of system architectures and technical mechanisms that allow for context-aware service accounting. Therefore, session and signaling mechanisms for federated system platforms have to be developed. Based on that, scalable procedures for differentiated usage- and context-dependent accounting will be investigated and integrated into the open system platform developed in the collaborative research center. The objectives are procedures that allow for context information usage accounting, but which provide at the same time an extensive privacy protection for the users.

Further information

Project: Nexus - Spatial World Models for Mobile Context-Aware Applications

Publications

2007

Wanke, S.; Scharf, M.; Kiesel, S.; Wahl, S.
Measurement of the SIP Parsing Performance in the SIP Express Router
Proceedings of the 13th Open European Summer School and IFIP TC6.6 Workshop (EUNICE 2007), Enschede, July 2007, pp. 103-110
[Show full record]
 
Gutscher, A.
A Trust Model for an Open, Decentralized Reputation System
Proceedings of the Joint iTrust and PST Conferences on Privacy Trust Management and Security (IFIPTM 2007), Moncton, New Brunswick, July 2007
[Show full record]
 
Kiesel, S.; Scharf, M.
Modeling and performance evaluation of transport protocols for firewall control
Computer Networks (ComNet) 2007, Vol. 51, No. 11, August 2007, pp. 3232-3251
[Show full record]

 
2006

Roßnagel, A.; Jandt, S.; Müller, J.; Gutscher, A.; Heesen, J.
Datenschutzfragen mobiler kontextbezogener Systeme
Deutscher Universitäts-Verlag / GWV Fachverlage GmbH, Wiesbaden, Deutschland, October 2006
[Show full record]
 
Aguiar, R.L.; Jähnert, J.; Gomez Skarmeta, A.F.; Hauser, C.
Identity Management in Federated Telecommunications Systems
Proceedings of the Workshop on Standards for Privacy in User-Centric Identity Management 2006, Zurich, July 2006
[Show full record]
 
Hauser, C.
A Methodology for Evaluating Threats to Multiple Virtual Identities
Beträge zum Essener Workshop zur Netzwerksicherheit (EWNS) 2006, Essen, October 2006
[Show full record]
 
Roussaki, I.; Strimpakou, M.; Pils, C.; Kalatzis, N.; Neubauer, M.; Hauser, C.; Anagnostou, M.
Privacy-Aware Modelling and Distribution of Context Information in Pervasive Service Provision
Proceedings of the 2006 IEEE International Conference on Pervasive Services (ICPS 2006), Lyon, June 2006, pp. 150-160
[Show full record]
 
Gutscher, A.
Coordinate Transformation - A Solution for the Privacy Problem of Location Based Services?
Proceedings of the 20th IEEE International Parallel and Distributed Processing Symposium (IPDPS) 2006, 2nd International Workshop on Security in Systems and Networks (SSN) (in conjunction with IPDPS2006), Rhode Island, April 2006
[Show full record]
 
Scharf, M.; Necker, M.C.; Gauger, C.M.; Gloss, B.; Hauser, C.; Jähnert, J.; Kiesel, S.; Köhn, M.; Kühn, P.J.; Reifert, A.; Sass, D.
To Session or not to Session - Session Concepts in Currently Emerging Future Networks
6th Würzburg Workshop on IP: 'Visions of Future Generation Networks', Würzburg, August 2006
[Show full record]
 
Rothermel, K.; Ertl, T.; Fritsch, D.; Kühn, P.J.; Mitschang, B.; Westkämper, E.; Becker, C.; Dudkowski, D.; Gutscher, A.; Hauser, C.; Jendoubi, L.; Nicklas, D.; Volz, S.; Wieland, M.
SFB 627 ­ Umgebungsmodelle für mobile kontextbezogene Systeme
Informatik - Forschung und Entwicklung, Vol. 21, No. 1-2, October 2006, pp. 105-113
[Show full record]

 
2005

Clarke, J.; Neubauer, M.; Hauser, C.
Security and privacy in a pervasive world - The Daidalos approach
EURESCOM message, Vol. 2, June 2005, pp. 8-8
[Show full record]
 
Fitzgerald, W.; Doolin, K.; Mahon, F.; Gomez Skarmeta, A.F.; Butler, S.; Schlosser, P.; Weyl, B.; Hauser, C.
Daidalos Security Framework for Mobile Services
Proceedings of eChallanges 2005, Ljubljana, October 2005
[Show full record]
 
Hauser, C.
Unterstützung der Privatsphäre in mobiler IP-basierter Kommunikation
14. Treffen der VDE/ITG-Fachgruppe 5.2.4 Mobilität in IP-basierten Netzen, Stuttgart, June 2005
[Show full record]
 
Olivereau, A.; Gomez Skarmeta, A.F.; Marin Lopez, R.; Weyl, B.; Brandao, P.; Mishra, P.; Ziemek, H.; Hauser, C.
An Advanced Authorization Framework for IP-based B3G Systems
Proceedings of the 14th IST Mobile & Wireless Communications Summit, Dresden, June 2005
[Show full record]
 
Weyl, B.; Brandao, P.; Gomez Skarmeta, A.F.; Marin Lopez, R.; Mishra, P.; Ziemek, H.; Hauser, C.
Protecting Privacy of Identities in Federated Operator Environments
Proceedings of the 14th IST Mobile & Wireless Communications Summit, Dresden, June 2005
[Show full record]
 
Clarke, J.; Butler, S.; Hauser, C.; Neubauer, M.; Robertson, P.; Orazem, I.; Jerman Blazic, A.; Williams, H.; Yang, Y.
Security and Privacy in a Pervasive World
Proceedings of the Eurescom Summit 2005, Heidelberg, April 2005
[Show full record]
 
Hauser, C.
Linking VIDs by Mobile IP-Based Communication
1st Daidalos Scientific Day, Trondheim, February 2005
[Show full record]

 
2004

Hauser, C.
Mobility Management Meets Privacy - the Failure of Existing Proposals and a New, Future-Proof Approach (Extended Version)
Report, IKR, Universität Stuttgart, Stuttgart, Germany, August 2004
[Show full record]
 
Clarke, J.; Butler, S.; Dempsey, S.; Crotty, M.; Brazil, J.; Blazic, A.; Hauser, C.; Neubauer, M.
Challenges of Identity, Authentication, and Discovery Management in a Ubiquitous Environment: The DAIDALOS perspective
Proceedings of the 7th International Symposium on Communications Interworking, INTERWORKING - 2004, Ottawa, November 2004
[Show full record]
 
Hauser, C.
Mobility Management Meets Privacy - the Failure of Existing Proposals and a New, Future-Proof Approach
Proceedings of the ACM International Workshop on Mobility Management and Wireless Access, Philadelphia, PA, October 2004, pp. 122-124
[Show full record]
 
Farshchian, B.; Zoric, J.; Mehrmann, L.; Cawsey, A.; Williams, H.; Robertson, P.; Hauser, C.
Developing Pervasive Services For Future Telecommunication Networks
Proceedings of the IADIS International Conference WWW/Internet 2004, Madrid, October 2004
[Show full record]
 
Kühn, P.J.
Locations-Based Services in Mobile Communication Infrastructures
AEÜ International Journal of Electronics and Communications, Vol. 58, March 2004, pp. 159-164
[Show full record]
 
Lück, S.; Gutscher, A.
Improving Access Discovery by Analysing World-Model Information
Ortsbezogene Anwendungen und Dienste, Fachgespräch der GI-Fachgruppe KuVS, Hagen, June 2004
[Show full record]

 

2003

Kühn, P.J.
Location Based Services in Mobile Communication Infrastructures
Proceedings of the Australian Telecommunications Networks and Applications Conference (ATNAC '03), Melborn, December 2003
[Show full record]
 
Rothermel, K.; Fritsch, D.; Kühn, P.J.; Mitschang, B.; Bauer, M.; Becker, C.; Hauser, C.; Nicklas, D.; Volz, S.
SFB627 Umgebungsmodelle für mobile kontextbezogene Systeme
Beiträge zur Informatik 2003 Innovative Informatikanwendungen, Frankfurt/Main, September 2003, pp. 103-115
[Show full record]
 
Student projects

Entwurf und Implementierung eines Reputationsdienstes zur Auswertung von Vertrauensbeziehungen
(Bachelor thesis No. 566, Finished)

Security evaluation of HIP in mobility scenarios
(Master thesis No. 553, Finished)

Design and Implementation of Methods for the Evaluation of the Trustworthiness of Federated Web Services
(Master thesis No. 549, Finished)

Entwurf und Implementierung eines Reputationssystems für virtuelle Identitäten
(Bachelor thesis No. 528, Finished)

Simulative Untersuchung von Anonymitätsdiensten in mobilen IP Netzen
(Bachelor thesis No. 508, Finished)

Federated Identities - Taxonomy, Interoperability and Demonstrator
(Master thesis No. 493, Finished)

Weiterentwicklung und Aufbau eines Anonymisierungsdienstes für mobile IP Kommunikation
(Bachelor thesis No. 472, Finished)

Security and Privacy Concepts for a Location Based Event Service
(Master thesis No. 471, Finished)

Leistungsbewertung von Anonymitätsdiensten in IP-Netzen
(Bachelor thesis No. 453, Finished)

Next Generation Optical Network for Broadband European Leadership
Funding

Public funding
European Commission

Overview and Objectives

The development of core transport networks in Europe is oriented towards "broadband for all", supporting broadband services for a wide mass of European citizens. This evolution is lead by a few basic drivers:

  • Improvement of quality and efficiency in providing current and new services,
  • Resources optimisation
  • Reduction of operational costs

These challenging objectives require a revision of network architectures and technologies, an integration of IP and transport layers including advanced Control Plane interworking, and an easy, automated management of optical transport network for fast provisioning and restoration.

To achieve the strategic goal of broadband for all, an appropriate core/metro network is required to provide cost-effective transport of end-user traffic with the required level of QoS. Based on the results of the project NOBEL phase 1, the main goal of the IST Integrated Project NOBEL phase 2 is to carry out analysis, feasibility studies and experimental validations of innovative network solutions and technologies for flexible, scalable and reliable optical networks, thus enabling broadband services for all.

IKR activities

The research interests of the IKR within the project NOBEL phase 2 are

  • Traffic measurement, chracaterisation and modelling
  • Traffic control and traffic management

and are connected by the investigation of multi-layer traffic egineering aspects. The institute's interests are arranged according to the workpackage structure of the project NOBEL phase 2. The following shows the involvement of the IKR in the different workpackages and the activities

  • WP2 - Service-focused network engineering and evaluation
    • Traffic measurement, characterization and modeling
    • Traffic engineering concepts for end-to-end broadband services for all
    • Performance evaluation of aspects in control plane enabled networks
  • WP3 Advanced Packet/Burst Switching
    • GMPLS enabled control plane in frame/burst switched networks
    • QoS support in GMPLS controlled frame/burst switched networks
  • WP4 - Network Management and Control/Protocols
    • Control plane enabled multi-layer and multi-service networks
    • Functionality, scalability and architecture of selected mulit-layer traffic engineering schemes based on GMPLS
Methods applied
  • Teletraffic theory and engineering
  • Event-driven simulation using IKRSimLib
  • Traffic measurement (I2MP)
  • Statistics
  • Requirements engineering
Publications

2007

Gunreben, S.; Hu, G.
A Multi-layer Analysis on Reordering in Optical Burst Switched Networks
IEEE Communication Letters, Vol. 11, No. 12, December 2007
[Show full record]
 
Gunreben, S.
Multi-layer Analysis to Quantify the Impact of Optical Burst Reordering on TCP Performance
Proceedings of the 9th International Conference on Transparent Optical Networks (ICTON 2007), Rome, July 2007
[Show full record]

 
2006

Gunreben, S.; Spadaro, S.; Sole-Pareta, J.
A Unified Model for Bandwidth Adaptation in Next Generation Transport Networks
Proceedings of the 1st IEEE International Workshop on Bandwidth on Demand, BoD 2006 in conjunction with the 49th IEEE GLOBECOM 2006, San Francisco, CA, November 2006
[Show full record]
 
Köhn, M.; Bodamer, S.; Gauger, C.M.; Gunreben, S.; Hu, G.; Sass, D.
Comparison of IP/WDM transport network architectures for dynamic data traffic
Proceedings of the 11th European Conference on Networks and Optical Communications (NOC2006), Berlin, July 2006
[Show full record]

 

Student projects

Entwurf und Implementierung eines Softwaremoduls zur Ansteuerung eines Ethernet Switches
(Bachelor thesis No. 652, Finished)

Delay Constraint Routing in Multi-layer Networks
(Master thesis No. 639, Finished)

Untersuchung von Auswirkungen von Out-Of-Sequence Bursts in OBS auf höhere Schichten
(Bachelor thesis No. 564, Finished)

Flow-based traffic characterisation of IP measurement data
(Bachelor thesis No. 560, In work)

Untersuchung der Modellierungseigenschaften von Netzwerkverkehr durch Lindenmayer-Systeme
(Bachelor thesis No. 559, Finished)

Untersuchung der Modellierungseigenschaften von Netzwerkverkehr durch Pareto Poisson Burst Prozess (PPBP)
(Bachelor thesis No. 497, Finished)

Link

http://www.cttc.es/project/next-generation-optical-networks-for-broadband-european-leadership-phase-2/

Peer-to-Peer SIP
Funding

Private funding

Overview and Objectives

Peer-to-peer mechanisms allow to decentralize and distribute centralized services that run on dedicated hardware, well-known systems, or that are manged by dedicated operators among several or all users of these services. In the context of SIP (Session Inititiation Protocol) they can promote current SIP-architectures towards the original intention of pure end-to-end session instantiation without intermediate or helper systems: necessary functionality currently provided by SIP-Proxies and Registrars can be realized with peer-to-peer mechanisms by the users themselves.

Within the IETF a new Working Group (WG) P2P-SIP is forming which intends to define necessary protocols enabling full SIP functionality between the users without any infrastructure support. Several application scenarios for this P2P-SIP service can be conceived, including ad-hoc emergency first responder communication networks, simple communication networks in private settings, and disconnected scenarios without access to the global Internet.

IKR activities

The IKR is mainly interested in aspectes supporting the trust of users towards such a new peer-to-peer based communication infrastructure. Basic peer-to-peer architectures without centralized services require cooperative environments without trust anchors which cannot be assumed in public environments normally. The focus of the activities revolves around 

  • Augmentation of basic P2P-SIP scenarios with additional services
  • Security in peer-to-peer networks
  • Management of distributed platforms by means of peer-to-peer mechanisms
Methods applied
  • Security and trust modelling and engineering
  • Simulation
Publications 

2006

Reifert, A.
Replikation in einem homogenen strukturierten Chord Peer-to-Peer Netz
VFF-Workshop "Dienste im Next Generation Network" (NGN), Stuttgart, March 2006
[Show full record]
Student projects

Design and Realization of a Decentralized Directory Service for Web Services in a Dynamic Environment
(Mini project No. 626, Finished)

Mapping of Resource and Service Descriptions in Peer-to-Peer Service Distribution Networks
(Master thesis No. 613, Finished)

Untersuchung der Minimum-Distance Routing Strategie in großen Kommunikationsnetzen
(Bachelor thesis No. 608, Finished)

Design and implementation of a remote control for prototypical peer-to-peer networks
(Bachelor thesis No. 607, Finished)

Untersuchung von Replikationsmechanismen in einem homogenen Chord Peer-to-Peer Netz
(Bachelor thesis No. 563, Finished)

Modelling and evaluation of replication and caching strategies in structured peer-to-peer networks
(Master thesis No. 561, Finished)

Design of a simulation model for analyzing inter-domain traffic in structured peer-to-peer networks
(Master thesis No. 513, Finished)

Realization of a edge node for a opto-electronic burst switching network
Funding

Private funding

Overview and Objectives

This project aims at the development of a cost-effective solution for the future optical IP network by the introduction of a novel opto-electronic burst switching technology. It transports both SDH signals as well as signals of data clients (e.g. IP, Ethernet, ...) in standardized G.709 frames as the data transport unit.

At the edge of a Frame Switching network, SDH signals are mapped into such frames while signals of data clients are first aggregated (i.e. different traffic flows are combined based on destination, QoS requirements, ...) and then assembled into frames. Frames are scheduled onto permanent or semi-permanent lightpaths and switched in Frame Switching core nodes.

For aggregation, scheduling and mapping of client signals into G.709 frames, specialized devices, called Frame Aggregation Units (FAU), are used. These units must operate at a line speed of 10 Gbps and above per wavelength.

This architecture provides promising feasibility, scalability and interoperability as well as multi-service support.

IKR activities

The IKR focuses in this project on the architectural design and the prototypical realization of the FAU. The Following research issues are addressed:

  • Investigation of the overall network architecture regarding realization aspects
  • Development and evaluation of different FAU architectures
  • Prototypical implementation of a FAU on Field Programmable Gate Arrays (FPGA) for demonstration purposes

This project is complemented by the project Frame Switching investigating the overall network architecture, network dimensioning concepts and control plane functionality.

Methods applied
  • Network architecture design
  • Hardware design, modeling and simulation using VHDL
  • Prototypical implementation on FPGAs
Publications

2010

Mutter, A.; Gunreben, S.; Lautenschläger, W.; Köhn, M.
A Testbed for Validation and Assessment of Frame Switching Networks
Proceedings of the 6th International Conference on Testbeds and Research Infrastructures for the Development of Networks and Communities (TridentCom 2010), Berlin, May 2010
[Show full record]

 
2009

Lautenschläger, W.; Mutter, A.; Gunreben, S.
Frame Assembly in Packet Core Networks - Overview and Experimental Results
Beiträge zur 10. ITG-Fachtagung Photonische Netze, Leipzig, May 2009
[Show full record]
 
Mutter, A.; Köhn, M.; Sund, M.
A Generic 10 Gbps Assembly Edge Node and Testbed for Frame Switching Networks
Proceedings of the 5th International Conference on Testbeds and Research Infrastructures for the Development of Networks and Communities (TRIDENTCOM 2009), Washington D.C., April 2009
[Show full record]

 
2006

Hauger, S.; Junghans, S.; Mutter, A.; Sass, D.
A Flexible Microprogrammed Packet Classifier for Edge Nodes of Transport Networks
Beiträge zur 7. ITG-Fachtagung Photonische Netze, Leipzig, April 2006
[Show full record]
Student projects

Entwurf und Realisierung eines parametrisierbaren Speichermanagers in VHDL für einen FPGA-basierten Netzknoten
(Bachelor thesis No. 674, Finished)

Entwurf und Realisierung einer Frame Aggregationseinheit mit zugehörigem Speicher-Manager in VHDL für einen FPGA basierten Netzknoten
(Bachelor thesis No. 622, Finished)

Entwurf und Realisierung eines GFP-Moduls für Punkt-zu-Mehrpunkt Verbindungen in VHDL für einen FPGA basierten Netzknoten
(Bachelor thesis No. 621, Finished)

VHDL-Erweiterung eines FPGA-Management-Systems und Realisierung einer konfigurierbaren grafischen Bedienoberfläche in Java
(Bachelor thesis No. 594, Finished)

Entwurf und Realisierung einer CAM-Erweiterungskarte mit zugehörigem VHDL-Logikmodul für die Universelle Hardware-Plattform
(Bachelor thesis No. 585, Finished)

Entwurf und Realisierung eines generischen DDR-SDRAM Speicher-Controllers in VHDL
(Master thesis No. 581, Finished)

Entwurf und Realisierung eines Management-Systems in VHDL
(Bachelor thesis No. 556, Finished)

Realisierung einer konfigurierbaren Bedienoberfläche für ein Management-System in Java
(Bachelor thesis No. 555, Finished)

Erweiterung und Überarbeitung der hochauflösenden Messumgebung für Gigabit-Ethernet "I2MP"
(Master thesis No. 541, Finished)

Entwurf und Realisierung eines generischen Verkehrsgenerators in VHDL
(Bachelor thesis No. 527, Finished)

Resource Management in 802.16e systems
Funding

Private funding

Overview and Objectives

This project deals with resource management schemes and scheduling algorithms in Orthogonal Frequency Division Multiple Access (OFDMA) networks according to the IEEE 802.16e standard. These networks are often referred to as mobile WiMAX. The focus lies on capacity and coverage enhancement of cellular 802.16e networks by means of interference coordination (IFCO) and frequency selective scheduling mechanisms, which are supported by state-of-the-art beamforming antennas. Furthermore, Quality of Service (QoS) aspects of the offered traffic flows, such as VoIP or streaming video, are considered.

Activites

The research activities focus on system and MAC layer aspects in a multi-cellular environment. A broad range of methodological and technological problems are treated:

  • Modeling of multi-cellular networks for packet level simulations
  • Modeling of the physical layer, in particular physical layer abstractions, including channel models
  • Development and evaluation of interference coordination mechanisms. These mechanisms coordinate base station transmissions either by means of global system knowledge, by means of communication among base stations, or purely by local base station knowledge.
  • Development and evaluation of frequency selective scheduling mechanisms
Methods applied

Performance evaluation within this project is mainly done by means of packet level simulations in a multi-cellular environment. The simulations cover all layers from a physical layer abstraction up to the transport layer. Performance measurements are usually done on the IP layer when looking at throughput metrics, which captures all overhead caused by MAC layer retransmissions and overhead. The simulation environment is based on the freely available IKR SimLib.

Publications

2008

Necker, M.C.; Köhn, M.; Reifert, A.; Scharf, J.; Sommer, J.
Optimized Frame Packing for OFDMA Systems
Proceedings of the 67th IEEE Vehicular Technology Conference (VTC2008 - Spring), Singapore, May 2008
[Show full record]

 
2007

Necker, M.C.
Coordinated Fractional Frequency Reuse
Proceedings of the 10th ACM/IEEE International Symposium on Modeling, Analysis and Simulation of Wireless and Mobile Systems (MSWiM 2007), Chania, Crete Island, October 2007
[Show full record]
 
Necker, M.C.
Local Interference Coordination in Cellular OFDMA Networks
Proceedings of the 66th IEEE Vehicular Technology Conference (VTC 2007 - Fall), Baltimore, MA, September 2007
[Show full record]
 
Necker, M.C.
Integrated Scheduling and Interference Coordination in Cellular OFDMA Networks
Proceedings of the 4th International Conference on Broadband Communications, Networks and Systems, IEEE BROADNETS 2007, Raleigh, NC, September 2007
[Show full record]
 
Necker, M.C.
Local Interference Coordination in Cellular OFDMA Networks
Beträge zur 12. VDE/ITG Mobilfunktagung, Osnabrück, May 2007
[Show full record]

 
2006

Necker, M.C.
Towards Frequency Reuse 1 Cellular FDM/TDM Systems
Proceedings of the 9th ACM/IEEE International Symposium on Modeling, Analysis and Simulation of Wireless and Mobile Systems (MSWiM 2006), Torremolinos, Malaga, October 2006
[Show full record]
Student projects

Designing a Frequency Selective Scheduler for WiMAX using Genetic Algorithms
(Master thesis No. 663, Finished)

Efficient Implementation of Genetic Algorithms on an FPGA
(Master thesis No. 662, Finished)

Efficient Parallel Implementation of Fast Fading Algorithms on the NVIDIA CUDA Architecture
(Master thesis No. 651, Finished)

Efficient Implementation of Fading-Algorithms on the IBM Cell Processor
(Master thesis No. 638, Finished)

Optimized Uplink Access in Wireless 802.16e (WiMax) Systems
(Master thesis No. 604, Finished)

Entwurf und Bewertung eines einfachen Modells für WWW-Verkehr
(Bachelor thesis No. 569, Finished)

Optimized assignment of resources in wireless 802.16e (WiMax) access networks
(Master thesis No. 595, Finished)

Evaluation of Uplink Access Delays in 802.16e Systems
(Bachelor thesis No. 590, Finished)

Design and evaluation of routing protocols for 802.16-based mesh networks with smart antennas
(Master thesis No. 583, Finished)

Safe And Secure European Routing
Funding

Public funding
German Federal Ministry of Education and Research (BMBF)

Overview and Objectives

Emerging technologies such as FTTx, LTE and Cloud Computing will dramatically increase the temporal dynamics and bandwidth demands in core networks. At the same time an increasing dependency of the private as well as the corporate sector on communication networks in general and the Internet in particular requires more reliability and security. The SASER project aims at researching methods and technologies to provide a stable, secure and reliable communication infrastructure in a scalable, energy-efficient and cost-effective way.

An important aspect in this project is therefore the efficient usage of the equipment present in core networks to meet future needs in terms of dynamics and bandwidth. The current technique of simply overprovisioning ressources does not scale well with the growth in demand and it might therefore no longer be economically feasible in the near future. The resulting proposition is that the networks themselves have to become more dynamic while maintining stability and reliability. This requires novel means of traffic prediction, traffic engineering, and policing as well as dynamic network reconfiguration.

IKR activities

The research interests of the IKR within this project can be subdivided into three work areas:

  • Smart Congestion Management
    This work item targets the design of adaptive traffic policing approaches and algorithms to protect the network from congestion and erroneous or malicious sources of traffic. Such policing shall leverage existing congestion contol mechanisms. It requires information on traffic characteristics and the network state, which may be obtained from existing ConEx and ECN schemes.
  • Efficient Network Resource Operation
    This work item centers on the development and analysis of approaches to dynamically adapt existing resources to the varying traffic demand. The main focus is on automatic topology reconfiguration in multi-layer networks (e.g. IP/MPLS-over-WSON networks). The benefit of dynamic optical bypassing and the exploitation of novel adaptive transponders will in particular be considered.
  • Integrated Architecture
    This work item integrates the mechanisms for congestion management with the resource reconfiguration mechanisms. This integration mitigates negative interactions and optimizes synergies of the approaches to provide a reliable and efficient network architecture.
Methods applied
  • Teletraffic theory and engineering
  • Network optimization
  • Network architecture and protocol design
  • Performance evaluation by event-driven simulation using IKR Simlib
Publications

2013

Feller, F.
Evaluation of a Centralized Method for One-Step Multi-Layer Network Reconfiguration
Proceedings of the 24th Tyrrhenian International Workshop on Digital Communications (TIWDC 2013), Genoa, September 2013
[Show full record]
 
Bauknecht, U.; Feller, F.
Dynamic Resource Operation and Power Model for IP-over-WSON Networks
Proceedings of the 19th Open European Summer School and IFIP TC6.6 Workshop (EUNICE 2013), Chemnitz, August 2013
[Show full record]


2014

Wagner, D.
Congestion Policing Queues - A New Approach To Managing Bandwidth Sharing At Bottlenecks
Proceedings of the 10th International Conference on Network and Service Management (CNSM), Rio de Janeiro, November 2014, pp. 206-211
[Show full record]

 
2016

Feller, F.
A Reconfiguration Method for Energy-Efficient Operation of Multi-Layer Core Networks - Communication Networks and Computer Engineering Report No. 113
Dissertation, Universität Stuttgart, Informatik, Elektrotechnik und Informationstechnik, 2016
[Show full record]
Student projects

Performance Investigation and Parameterization of a Dynamic Optical Bypassing Algorithm based on Simulated Annealing
(Bachelor thesis No. 818, Finished)

Investigation of Dynamic Routing Strategies in Dynamic Optical Bypassing Networks
(Master thesis No. 838, Finished)

Investigation of MILP Based Solution Strategies for Dynamic Multilayer Network Optimization
(Master thesis No. 854, Finished)

Analysis and Implementation of Heuristics determining Light Paths in dynamic optical Networks
(Bachelor thesis No. 851, Finished)

Selection, Implementation and Evaluation of Heuristics determining Light Paths in dynamic optical Networks
(Bachelor thesis No. 914, Finished)

Project websites

 

Scalable, efficient and flexible next generation converged mobile, wireless and fixed access networks
Funding

Public funding
German Federal Ministry of Education and Research (BMBF)

Overview and Objectives

ScaleNet aims at a comprehensive, cost effective, flexible and efficient system concept, based on an IP-optimized integration of heterogenous wireless and fixed wire access networks and its access methods. The goal is an integrated provisioning of attractive broadband multimedia services to the end user. The user will profit not only by a consistent service concept with unlimited mobility, but also by lower prices. ScaleNet will offer cost savings for operators with respect to network installation and network operation as well as for service providers by facilitating an easy introduction of new services.

IKR activities

The IKR is involved in two work packages of ScaleNet, covering architectural system aspects, mobility management concepts, signaling issues and service architectures. In particular, the IKR is involved in the following activities:

  • AP3: Overall System Control
    • Architecture for a Heterogenous Management Architecture
    • Interworking with existing radio access technologies
    • Performance Evaluation of different architectures, concepts and strategies
    • Design of interfaces and protocols for heterogenous access management
  • System Support for Services
    • Scalable service platforms
    • Simplified service development and deployment
Methods applied
  • Event-driven simulation using IKR Simlib
  • Teletraffic theory and engineering
Student projects

Untersuchung von NSIS als Signalisierprotokoll in heterogenen Mobilkommunikationssystemen
(Bachelor thesis No. 619, Finished)

Untersuchung und Optimierung der Leistung von SIP-Protokollstapeln
(Bachelor thesis No. 596, Finished)

Aktualisierungsstrategien für dynamische Informationen über Zugangsnetze
(Bachelor thesis No. 537, Finished)

Pagingverfahren in heterogenen Zugangsnetzen
(Bachelor thesis No. 536, Finished)

Links

https://telematics.tm.kit.edu/3872_projectScaleNet.php

http://publica.fraunhofer.de/dokumente/N-133955.html

 

 

Security in Signalling Networks
Funding

Private funding

Overview

Together with a large operator, security aspects in signalling networks are explored and solved.

 

Secure Networking for a Data Center Cloud in Europe
Funding

Public funding
German Federal Ministry of Education and Research (BMBF)

Overview and Objectives

New applications and scenarios such as Industry 4.0, mobile connected objects, Internet of Things, connected car and especially 5G lead to a vast increase in the number of end devices and a tremendous growth in data traffic volume, especially towards the data centers. However, it's not just the bandwidth, but also the quality of service required by such applications that necessitates a closer integration of data center resources and network resources to enable future services. Todays network and data center architectures are not capable of dynamically handling these future requirements. Therefore, the goal of project SENDATE is to provide concepts and solutions for a network and data center architecture that supports future application requirements in a secure and flexible way.

An integral part of this project are advanced network control mechanisms allowing to efficiently interconnect users and data centers as well as data centers among each other. Since especially traffic to and between DCs can shift quickly between different sites, future traffic will be much more volatile than today's thereby rendering static configuration and service provisioning ineffective. In order to efficiently meet quality of service requirements while avoiding overprovisioning, it is necessary to dynamically adapt the network configuration to the changing requirements.

IKR activities

The research interests of the IKR within this project can be subdivided into two work areas:

  • Optimal Assignment of Network Resources
    This work item centers on the development and analysis of approaches to dynamically assign network resources to network services according to their QoS requirements. Usually, compliance with those requirements is guaranteed by overprovisioning of network resources which is expensive and inefficient. The goal of this work item is to assign network resources in such a way that overprovisioning is minimized.
  • Efficient and Highly Available Network Control
    Classical control architectures like GMPLS employ decentralized approaches to provide robust network control which is independent of central instances. In contrast to that, the SDN paradigm uses a central controller that has a global view of the network and thus can make decisions in a very efficient way. This work item targets the design of functions for a control architecture that combines both centralized and decentralized approaches in order to provide a network that is efficient and highly available at the same time.
Methods applied
  • Network optimization
  • Performance evaluation by event-driven simulation using IKRSimlib
  • Network architecture design
Publications

2019

Bauknecht, U.; Enderle, T.; Witt, A.
Reduction of Delay Overfulfillment in IP-over-DWDM Transport Networks
Proceedings of the 23rd Conference on Optical Network Design and Modeling (ONDM 2019), Athens, May 2019
[Show full record]
 
Protzmann, R.; Hübner, K.; Ascheuer, N.; Bauknecht, U.; Enderle, T.; Gebhard, U.; Raack, C.; Witt, A.
Large-scale Modeling of Future Automotive Data Traffic towards the Edge Cloud
Proceedings of the 20th ITG-Symposium in Photonic Networks 2019, Leipzig, May 2019
[Show full record]
 
Enderle, T.; Ascheuer, N.; Bauknecht, U.; Gebhard, U.; Hübner, K.; Protzmann, R.; Raack, C.; Witt, A.
Reconfigurable Resource Allocation in Dynamic Transport Networks
Proceedings of the 20th ITG-Symposium in Photonic Networks 2019, Leipzig, May 2019
[Show full record]

 
2018

Enderle, T.; Bauknecht, U.
Modeling Dynamic Traffic Demand Behavior in Telecommunication Networks
Proceedings of the 19th ITG-Symposium in Photonic Networks 2018, Leipzig, June 2018, pp. 18-25
[Show full record]

 
2017

Bauknecht, U.
Resource Efficiency and Latency in Dynamic IP-over-WSON Networks utilizing Flexrate Transponders
Proceedings of the 18. ITG-Symposium in Photonic Networks 2017, Leipzig, May 2017, pp. 36-41
[Show full record]
Student projects

Transport Network Reconfiguration using Contextual Bandits and Neural Networks
(Master thesis No. 974, Finished)

Design and Implementation of an ONOS Network Reconfiguration Application
(Bachelor thesis No. 980, Finished)

Implementation and Evaluation of a Software-Defined Networking Testbed
(Master thesis No. 977, Finished)

Transportnetzsteuerung durch neuronale Netze für Graphen
(Bachelor thesis No. 968, Finished)

Optimierung von Hyperparametern für neuronale Netze
(Bachelor thesis No. 972, Finished)

Concept and Implementation of a Redundancy Assessment Model in an optical Wide Area Network and exemplary Applications.
(Master thesis No. 964, Finished)

Multi-Layer Network Encodings for Genetic Algorithms
(Master thesis No. 962, Offer)

Transport Network Reconfiguration using Deep Learning
(Master thesis No. 960, Finished)

Deep Learning for Transport Network Control
(Master thesis No. 945, Finished)

Event-Triggered Dynamic Multi-Layer Network Reconfiguration
(Master thesis No. 944, Finished)

Genetic algorithms for transport network control
(Master thesis No. 937, Finished)

Failover Mechanisms for Dynamic Network Operation
(Master thesis No. 930, Finished)

Project websites

 

Service Quality and TCP Optimization in Mobile Communication Systems
Funding

Private funding

Overview and Objectives

The project investigates cross-layer interactions in wireless access networks. The focus lies on mechanisms on the Medium Access Control (MAC) layer and the interactions of MAC layer mechanisms with higher layer protocols. In particular, the performance of the Transmission Control Protocol (TCP) and other transport protocols is evaluated. The performance on the application layer is investigated at the important examples of WWW and video services. Mechanisms to improve the protocol and service performance are developed and compared with each other as well as with existing approaches.

Activities

The research activities cover a broad spectrum ranging from physical layer modeling to service performance evaluation. This allows a holistic treatment of all aspects relevant to the end-to-end service performance. In particular, the research activities can be grouped as follows:

  • Modeling of the data path in present and future radio access networks (EGPRS, UMTS, HSDPA, HSUPA).
  • Investigation of MAC-layer performance under special consideration of interactions with higher protocol layers (e.g., scheduling, QoS provisioning, buffer dimensioning).
  • Evaluation of approaches to enhance transport protocol and service performance over radio links (e.g., protocol helpers, split connection HTTP and TCP proxies).
  • Performance evaluation of streaming video services in radio access networks. Development of strategies to enhance video quality over time-variant radio links.
Methods applied

Performance evaluation within this project is mainly done using simulation and emulation. For this purpose, an integrated simulation and emulation environment for generic radio access networks has been developed. This environment allows the performance evaluation of various radio access networks in combination with different services and protocols. The simulation and emulation environment is based on the freely available IKR SimLib.

In addition to the simulation and emulation activities, analytical studies are performed to complement the performance evaluation.

Publications

2007

Orlov, Z.; Necker, M.C.
Enhancement of Video Streaming QoS with Active Buffer Management in Wireless Environments
Proceedings of the 13th European Wireless 2007 (EW 2007), Paris, April 2007
[Show full record]

 
2006

Feller, F.; Necker, M.C.
Comparison of Opportunistic Scheduling Algorithms for HSDPA Networks
Proceedings of the 12th Open European Summer School and IFIP WG 6.3, WG 6.4, WG 6.6 and WG 6.9 Workshop (EUNICE 2006), Stuttgart, September 2006
[Show full record]
 
Necker, M.C.; Weber, A.
Protocol Interference between Up- and Downlink Channels in HSDPA
Proceedings of the 17th Annual IEEE International Symposium on Personal, Indoor and Mobile Radio Communications (PIMRC 2006), Helsinki, September 2006
[Show full record]
 
Necker, M.C.
A comparison of scheduling mechanisms for service class differentiation in HSDPA networks
AEÜ International Journal of Electronics and Communications, Vol. 60, No. 2, February 2006, pp. 136-141
[Show full record]

 
2005

Necker, M.C.; Weber, A.
Parameter Selection for HSDPA Iub Flow Control
Proceedings of the 2nd International Symposium on Wireless Communication Systems, Siena, September 2005
[Show full record]
 
Necker, M.C.; Saur, S.
Statistical Properties of Fading Processes in WCDMA Systems
Proceedings of the 2nd International Symposium on Wireless Communication Systems, Siena, September 2005
[Show full record]
 
Necker, M.C.; Weber, A.
Impact of Iub Flow Control on HSDPA System Performance
Proceedings of the 16th Annual IEEE International Symposium on Personal Indoor and Mobile Radio Communications, Berlin, September 2005
[Show full record]
 
Necker, M.C.
A simple model for the IP packet service time in UMTS networks
Proceedings of the 19th International Teletraffic Congress (ITC 19), Beijing, August 2005
[Show full record]
 
Schröder, B.; Necker, M.C.; Stähle, D.
3G Networks and Beyond: An Introductory Course to Modeling, Planning, and Future Aspects of UMTS Networks
19th International Teletraffic Congress (ITC 19), Beijing, China, August 2005, Beijing, August 2005
[Show full record]
 
Necker, M.C.; Scharf, M.; Weber, A.
Performance of TCP and HTTP Proxies in UMTS Networks
Proceedings of the 11th European Wireless 2005 (EW 2005), Nicosia, April 2005, pp. 504-513
[Show full record]

 
2004

Necker, M.C.; Scharf, M.; Weber, A.
Performance of Different Proxy Concepts in UMTS Networks
Proceedings of the First International Workshop of the EURO-NGI Network of Excellence, Lecture Notes in Computer Science (LNCS) 3427, Dagstuhl Castle, June 2004, pp. 36-51
[Show full record]
 
Mutter, A.; Necker, M.C.; Lück, S.
IP-Packet Service Time Distributions in UMTS Radio Access Networks
Proceedings of the 10th Open European Summer School and IFIP WG 6.3 Workshop (EUNICE 2004), Tampere, June 2004, pp. 71-78
[Show full record]
 
Scharf, M.; Necker, M.C.; Gloss, B.
The Sensitivity of TCP to Sudden Delay Variations in Mobile Networks
Proceedings of the 3rd IFIP-TC6 Networking Conference, Lecture Notes in Computer Science (LNCS) 3042, Athens, May 2004, pp. 76-87
[Show full record]
 
Scharf, M.
The Impact of Delay Variations on TCP Performance
Proceedings of the 2nd Workshop on Modeling and Optimization in Mobile, Ad hoc and Wireless Networks (WiOpt '04), Cambridge, March 2004, pp. 419-420
[Show full record]
 
Scharf, M.
The Impact of Delay Variations on TCP Performance
ITG Fachgruppe 5.2.1 Workshop, Hamburg, February 2004
[Show full record]
Student projects

Entwurf und Bewertung eines einfachen Modells für WWW-Verkehr
(Bachelor thesis No. 569, Finished)

Performance evaluation of channel-aware scheduling mechanisms in HSDPA with QoS support
(Master thesis No. 551, Finished)

Development and Evaluation of Different Concepts for Multicast-Services in HSDPA
(Master thesis No. 550, Finished)

Bewertung verschiedener Kanalprädiktoren zur leistungssteigerung kanalabhängiger Schedulingverfahren bei HSDPA
(Bachelor thesis No. 533, Finished)

Leistungsbewertung verschiedener Schedulingverfahren in HSDPA-Systemen
(Bachelor thesis No. 529, Finished)

Evaluation and Optimization of the TCP Round Trip Time Estimation in Mobile Networks
(Master thesis No. 479, Finished)

Entwicklung einer automatisierten WWW-Testumgebung für ein UMTS-Testbed
(Bachelor thesis No. 470, Finished)

Entwicklung einer Simulationsumgebung zur Leistungsbewertung von Streaming-Protokollen in Mobilfunknetzen
(Bachelor thesis No. 463, Finished)

Simulation models for random access channels in UMTS
(Master thesis No. 430, Finished)

Implementierung und Leistungsbewertung eines ARQ-Moduls für UMTS
(Bachelor thesis No. 427, Finished)

Analysis of different Scheduling Schemes for packet data transfer over third generation mobile communication systems
(Master thesis No. 398, Finished)

Untersuchung von Optimierungsansätzen zur TCP-Datenflusssteuerung in Mobilkommunikationssystemen der 2.5 und 3. Generation
(Master thesis No. 388, Finished)

 

SMART – Simulation von Mobilfunk und Automobilverhalten in Realzeit
Funding

Public funding
German Federal Ministry of Education and Research (BMBF)

Overview and Objectives

For autonomous driving, innovative V2X (vehicle-to-X, where X can stand for other vehicles, road users or infrastructure) applications place high demands on mobile networking. A central challenge is that the quality of service of wireless communication networks varies and cannot be guaranteed. SMART is investigating how V2X applications can deal with such deficits in cellular networks. The suitability of LTE/5G for V2X communication is evaluated for selected scenarios. SMART designs a mechanism for negotiating the quality of service and evaluates this
mechanism through simulation. In order to evaluate scenarios that are as realistic as possible, a modular and expandable simulation platform is being developed, which couples various co-simulators in a new way. The co-simulators include a vehicle, a road traffic and a network simulation. A game engine is used for the visualization and detailed simulation of physical effects (e.g. shadowing, distance measurement with radar sensors or image recognition) in selected parts of the model. The simulation in real time offers the possibility to simultaneously evaluate human actors and autonomous driving functions in an integrated simulation. In addition, the predictability of stochastic guarantees of the quality of service and the performance of the V2X applications are examined.

IKR Activities

The research interests of the IKR within this project can be subdivided into the following topics:

  • Prediction of the radio channel quality in LTE/5G sidelink communication
  • Investigation on the benefits of communication and radio channel quality prediction on vehicle control
  • Real-time and cooperative execution of discrete-event mobile radio simulations
Methods applied
  • Mobile radio network modeling
  • Simulator development
  • Performance evaluation by event-driven simulation using IKRSimlib
Student projects

Untersuchung von NSIS als Signalisierprotokoll in heterogenen Mobilkommunikationssystemen
(Bachelor thesis No. 619, Finished)

MA894
MA941
MA970
BA981
BA996
BA998
FA978

 

Self-Optimizing LTE Base Station Schedulers
Funding

Private funding

Overview and Objectives

The project aims at the development and evaluation of controllers to adjust scheduler and further physical and MAC-layer parameters in base stations of future mobile communication networks. This parameter tuning is performed depending on the actual context and operator-defined policies while the base station is in a fully operational mode. The goal is thus to enhance base station equipment with self-optimization capabilities in order to achieve higher resource efficiency and to automatically adapt to changing environmnental conditions.

Activities

The research activities focus on physical and MAC layer aspects in a cellular network according to the 3GPP Long Term Evolution (LTE) standards. Within the project, the following technological problems are addressed:

  • Evaluation of potential control and actuating variables in an LTE eNodeB
  • Modeling of radio layers in an LTE system to investigate key performance indicators
  • Development and evaluation of controller algorithms in a multi-cell environment

 

 

Spontane Virtuelle Netze (SpoVNet)
Funding

Public funding
State Baden Württemberg, state foundation

Overview and Objectives

SpoVNet aims at providing spontaneous communication to a group of network nodes by means of spontaneous virtual overlay networks in a self-organizing way. The SpoVNet will be able to operate in heterogeneous wireless and wired environments. A SpoVNet will be used by an application to provide certain services to the end-users. In the course of the SpoVNet-project, two applications will be investigated examplanatory, namely an video-service and a multi-user game.

IKR activities

The IKR is responsible for work package 5 within the SpoVNet project, which deals with the evaluation and optimization of the SpoVNet architecture. Particular emphasis will be placed on aspects of the underlying network, the applied access technologies, and cross-layer issues.

Methods applied
  • Simulation
  • Analysis
Link

https://de.wikipedia.org/wiki/SpoVNet

Scalable, Tunable and Resilient Optical Networks Guaranteeing Extremely-high Speed Transport
Funding

Public funding
European Commission

Overview and Objectives

Current transport network solutions face problems with

  • scalability
  • cost efficiency
  • end-to-end quality of service

and are therefore not suitable to satisfy future demands.

The main goal of STRONGEST is to design and to demonstrate an evolutionary transport network, which solves the problems stated above. There are two main aspects in order to reach this goal:

  • design of an ultra-high capacity multilayer network architecture with optimized usage of packet and circuit switching technology
  • development of a mulit-domain and multi-technology control plane
IKR activities

Reasearch interests of the IKR within the project are mainly traffic engineering mechanisms within multilayer networks. The work done mostly within workpackage 2 ("Network efficiency and optimization") of the STRONGEST project covers especially the dynamic adaptation of the network topology to the current load situation.

Methods applied
  • Event-driven simulation using IKR Simlib
  • Teletraffic theory and engineering
  • Statistics

 

Secure Widespread Identities for Federated Telecommunications
Funding

Public funding
European Commission

Overview and Objectives

SWIFT stands for "Secure Widespread Identities for Federated Telecommunications". It is a European Union funded project of the 7th Framework Programme. It aims to leverage identity technology as a key to integrate service and transport infrastructures for the benefit of users and providers. It focuses on extending identity functions and federation to the network while addressing usability and privacy concerns.

SWIFT aims to build on considerable identity management work that has already been done in standards and in multiple R&D projects. The project aims to extend identity management in vital R&D areas as follows:

  • Develop solutions, which use identity as a key enabling technology for convergence a) technically between networks, services, applications and content and b) business-wise between operators, service providers, micro-operators and even users as providers.
  • Design a cross-layer identity framework with major emphasis on the network to support rather than to change the user's habits and to enhance experience. Include support for multiple personae and enable a strong privacy of the user's attributes and data.
  • Support identity, privacy, and security for the user across layers, resolving addresses and names revealing only what the user needs and accepts for the expected functionality.
  • Provide cross-layer usability features, such as ubiquitous connectivity, user-centred mobility, single sign-on and single bill.
  • Develop a model for the handling and management of user data linked to one of his identities or personae, where the user controls which info may be passed on depending on the recipient, his context, and on other external rules.

These global objectives aim to prepare the grounds for a new dimension of business dynamics allowing a fast entry of new players and expanding the business of existing players.

The work covers transport and services strata (in ITU terms) and all related ISO/OSI layers, with the user's identity being intrinsic to the control, data, and management plane protocols. Specifically, technological advances and breakthroughs will be targeted for the following:

  1. Vertical integration of identity, privacy, trust, and security across layers: Protocols, addressing schemes and inter-layer interfaces that provide controlled privacy for the user.
  2. New identity-centric user schemes supporting different levels of information access control, both policy as well as credential-based with well-defined privacy rules about who can change or even knows the data handled.
  3. Methods and techniques on how users are identified and located on the one hand, but may remain pseudonymous at all layers based on preferences set by the users and their context.
  4. Identity-based mobility solution: Adaptation of mobility protocols to the user's "moving identities" across devices, services and networks.
  5. Semantic interoperability of electronic identity management (eIdM) systems of legacy and possibly different national instances. Meta data model to deal with data sets used in IdM systems to support interoperability and to allow special characteristics such as user-dependent context that can be used in real time.
  6. An Identity Management Platform providing a common framework and APIs for accessing identity attributes across services and networks in a controlled way enabling user privacy mechanisms including specific APIs, such as for an Identity Broker.
  7. Mapping new identity techniques to existing technology (SIM cards, etc), and eIdM and Authentication, Authorization, Accounting (AAA) solutions to accommodate Identity Management. Specification and validation of extensions / modifications of existing ones to support SWIFT vision.
  8. Techniques for name and identifier resolution across very heterogeneous namespaces.
  9. Contribution to the standardization and ongoing work in ETSI, IETF, ITU, to include SWIFT identity approach at the different layers to go beyond the existing solutions.
  10. Key principles of SWIFT should remain universally applicable and independent of the evolution of networks in the FMC or future internet context.
IKR activities
  • Identity-Centric Mobility (Session Mobility, ...)
  • Performance Evaluation of Identity-Centric Communication Patterns
Methods applied
  • Security modelling and engineering
  • Software Engineering
  • Performance Evaluation
Link

https://www.it.pt/Projects/Index/885

Architecting the Future Internet
Funding

(none)
European Commission

Overview and Objectives

Trilogy is a collaborative research project within the ICT theme of the 7th Framework Programme of the European Commission that contributes to the objective "Network of the Future". The aim of the Trilogy project is to develop new solutions for the control architecture of the future Internet. The name Trilogy reflects the project focus on three important technical areas and their interdependencies to re-architect the Internet:

  • Reachability mechanisms
    This part of the project invests traffic engineering and routing mechanisms for the future Internet. An important aspect for this work is to provide control and transparency to different stakeholders and at the same time maintain scalability with the growth in traffic volume. This work includes topology discovery, inter-domain routing and policy routing.
  • Resource control
    Resource control needs to be efficient and fair. In the future, fairness should also be defined in economic terms. In this part of the project topics on congestion control, resource scheduling, control theory, queuing algorithms and the economics of resource control are invested.
  • Social and commercial control
    Technical mechanisms of the future Internet will be influence by the business strategy of the different stakeholders. Social-economic and commercial factors that influence the interplay between the technical inter-networking functions are analysed in this part of the project.
IKR activities

The IKR activities focus on new congestion control algorithms. In the future, congestion control needs to provide a sense of fairness that will take social-economic factors into account. Based on advanced bandwidth probing techniques, the invested congestion control mechanism aim to collect better information on the current network state to realize a more efficient and fair resource sharing.

Methods applied
  • Protocol Engineering
  • Kernel implementation (Linux)
  • Performance evaluation in simulations
Publications

2011

Kühlewind, M.; Briscoe, B.
Chirping for Congestion Control
80th IETF Meeting, ICCRG Session, Prague, March 2011
[Show full record]
Link

https://archive.eurescom.eu/message/messageMar2008/Trilogy_Architecting_the_Future_Internet.asp

ITG Section 5.2.2 - Network Security
Funding

No external funding

Overview and Objectives

The group 5.2.2 is part of the Information Technology Society ( ITG) within the Association for Electrical, Electronic & Information Technologies ( VDE). The group deals with all aspects of network security. It has committed itself to foster the exchange of information among researchers and developers from academia and industry.

The IKR is a founding member of this group and actively particpates in it. The participation comprises the presentation of research results from all kind of projects as well as the hosting of group meetings.

More information on the work of this group can be obtained by the following links.

Links
ITG 5.2.4 - Mobility in IP-based Networks
Funding

No external funding

Overview and Objectives

The group 5.2.4 "Mobility in IP-based Networks" of the Information Technology Society (ITG) of the german Association for Electrical, Electronic & Information Technologies (VDE) deals with all aspects of mobility in IP-based networks, particularly in wireless networks.

As a forum for discussion and exchange for researchers and experts from industry and academia, the group 5.2.4 organizes regular workshops on different topics around network architecture, protocols, algorithms, standardization issues and evaluation of future mobile communication networks. Among others, previous workshops focused on:

  • Simulation methodology for performance evaluation of wireless networks
  • Mobile TV
  • Fixed Mobile Convergence
  • Architecture of Next Generation Mobile Networks
  • Voice-over-IP over Wireless
  • Mobility models and vertical handovers

A complete list of previous workshops including the presentations and summaries of the discussions can be found here: Workshops of the ITG 5.2.4

The IKR is an active member of the group 5.2.4 since its foundation in 2001. The participation comprises the presentation of research results, organization and hosting of workshops as well as the administration of the group's Internet presence.

Further information on the ITG 5.2.4's activities
Publications

2008

Necker, M.C.
Interference Coordination in OFDMA Networks
Beiträge zum 26. Treffen der VDE/ITG-Fachgruppe 5.2.4 'The Future of Broadband Wireless: Between Feasibility and Profitability', Düsseldorf, February 2008
[Show full record]

 
2007

Müller, C.M.
IEEE 802.21 and its usage as an access network discovery database
Beträge zum 23. Treffen der VDE/ITG-Fachgruppe 5.2.4 Mobilität in IP-basierten Netzen, Workshop zum Thema 'Netzdatenbanken', Berlin, May 2007
[Show full record]
 
Wahl, S.; Oberle, K.; Scharf, M.
Personal Communication Assistant Application for comprehensive FMC support
Beträge zum 22. Treffen der VDE/ITG-Fachgruppe 5.2.4 Mobilität in IP-basierten Netzen, Darmstadt, 2007, Darmstadt, January 2007
[Show full record]
 
Kögel, J.
The Daidalos Virtual Identity Concept
Beiträge zum 22. Treffen der VDE/ITG-Fachgruppe 5.2.4 Mobilität in IP-basierten Netzen, Darmstadt, 2007, Darmstadt, January 2007
[Show full record]

 

2006

Gloss, B.
Mobilitätsmodellbasierte Ressourcenmodellierung für Heterogene Umgebungen
ITG FG 5.2.1/FG 5.2.4, Workshop 'Mobilitätsmodelle + (vertical) Handover', München, March 2006
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Sommer, J.; Tacke, S.; Zündel, H.; Gauger, C.M.
Modeling and Performance Evaluation of a Manual Logon System for Electronic Fee Collection
VDE/ITG-Fachgruppe 5.2.4, Workshop: Communication Applications for Logistics: Maut, Telematics and More, Bremen, January 2006
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2005

Hauser, C.
Unterstützung der Privatsphäre in mobiler IP-basierter Kommunikation
14. Treffen der VDE/ITG-Fachgruppe 5.2.4 Mobilität in IP-basierten Netzen, Stuttgart, June 2005
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Lück, S.
Eine Architektur zur Erfassung und Bereitstellung von Netzabdeckungen von Hotspots
15. Treffen der VDE/ITG-Fachgruppe 5.2.4 Mobilität in IP-basierten Netzen mit dem Workshop 'Vertical Handover - Providing Intersystem Mobility for Heterogeneous Networks', Aachen, September 2005, Aachen, September 2005
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Scharf, M.
Skalierbarkeit einer Plattform für föderierte ortsbezogene Dienste
14. Treffen der VDE/ITG-Fachgruppe 5.2.4 Mobilität in IP-basierten Netzen mit dem Workshop 'Location awareness in communications: Technologies, applications and security aspects', Stuttgart, Juni 2005, Stuttgart, June 2005
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Performance evaluation of automotive communication systems and telematics services
Funding

Private funding

Overview and Objectives

In recent years, the importance of automotive communication systems has grown rapidly. Today, most innovations in automotive systems are based on electronics and software. An upper-class passenger car contains up to 70 Electronic Control Units (ECUs) with several hundred software-enabled functions distributed over different interconnected network technologies. The multitude of in-vehicle network technologies were developed due to the diversification of costs, performance, dependability requirements, and the need for higher data rates. The number of ECUs and the steadily implementation of network technologies lead to physically separated independent systems (domains) connected via gateways.

However, the large number of ECUs, distributed functions and applications, and their interactions over different domains increases the complexity and costs of today's in-vehicle network systems. To enable advanced safety functions (e.g. Driver Assistance Systems) and comfort applications, next generation in-vehicle network systems must reduce this complexity while having low costs, real-time services, and supporting high data rates.

Within the XDomain project, we investigate the performance of gateway architectures, next-generation in-vehicle network technologies and telematics applications. We focus on automotive-specific network technologies such as CAN and MOST as well as standard technologies.

Activities
  • Design and resource dimensioning of in-vehicle gateway architectures
  • Modeling and performance evaluation of upcoming applications in multi-domain scenarios, focused on CAN- and MOST-domains
  • Design of novel scheduling algorithms for efficient software updates
  • Performance evaluation of different standard technologies as a possible in-vehicle network technology
  • Technology monitoring
Applied models and methodologies
  • Queueing models and Petri nets
  • Queueing theory, scheduling theory, and protocol engineering
  • Event-driven simulation using the IKR SimLib
Publications

2008

Sommer, J.; Feil, V.; Adeva Sanz, E.
Scheduling Algorithms for Simultaneous Software Updates of Electronic Devices in Vehicles
Proceedings of the IEEE International Conference on Communications Workshops, Beijing, May 2008
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2006

Sommer, J.; Burgstahler, L.; Feil, V.
An Analysis of Automotive Multi-Domain CAN Systems
Proceedings of the 12th Open European Summer School and IFIP WG 6.3, WG 6.4, WG 6.6 and WG 6.9 Workshop (EUNICE 2006), Stuttgart, September 2006
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Tacke, S.; Sommer, J.; Zündel, H.; Gauger, C.M.
Modeling and Performance Evaluation of a Manual Logon System for Electronic Fee Collection
Proceedings of the 9th Communications and Networking Simulation Symposium (CNS 2006), Huntsville, Alabama, April 2006
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Sommer, J.; Tacke, S.; Zündel, H.; Gauger, C.M.
Modeling and Performance Evaluation of a Manual Logon System for Electronic Fee Collection
VDE/ITG-Fachgruppe 5.2.4, Workshop: Communication Applications for Logistics: Maut, Telematics and More, Bremen, January 2006
Student projects

Design and evaluation of methods for updating in-vehicle software
(Master thesis No. 653, Finished)

Entwurf und Bewertung eines Sicherheitskonzepts für den Zugriff auf ein fahrzeuginternes Kommunikationssystem
(Bachelor thesis No. 620, Finished)

Modelling and Simulative Performance Evaluation of an embedded Ethernet-MOST-Gateway
(Master thesis No. 610, Finished)

Analysis and Evaluation of the End-to-end Behaviour of a Transport Protocol in Automotive CAN Systems
(Master thesis No. 605, Finished)

MOST extension of an architecture concept tool
(Master thesis No. 584, Finished)

Development and application of measuring methods for validation of data link layer-mechanisms in the communcication system MOST
(Master thesis No. 579, Finished)

Entwurf und Realisierung eines Simulationstools zur Leistungsuntersuchung von FlexRay
(Bachelor thesis No. 573, Finished)

Entwurf und Aufbau eines Messsystems zur Leistungsbewertung des Kommunikationssystems MOST
(Bachelor thesis No. 544, Finished)

Performance Modeling and Evaluation of a terminal dial-up process for a large-scale telematics system
(Master thesis No. 519, Finished)

User-controlled Resource Management in the Access Network
Funding

Public funding
German Federal Ministry of Education and Research (BMBF)

Overview and Objectives

In project YouQoS, a new concept for quality of service improvement will be designed, evaluated with respect to different criteria and implemented prototypically. According to this concept, each end user influences the desired priorization of the data flows of different applications himself. This is required due to the unsatisfactory data rate of the network access in many areas, which is not sufficient for modern Internet applications.

The network of the Internet service provider will be enhanced by functional elements which make it possible to classify and prioritize data flows towards the end user according to the wishes of the end user and to increase significantly the quality of service for the user. With a demonstrator, the approach shall be evaluated.

IKR activities

Typical applications will be classified and their requirements on the transmission will be derived. Followingly, different alternatives for the overall architecture will be designed and evaluated with respect to their performance and the required effort for their realization. On the basis of the existing scheduler from the project partner InnoRoute, a scheduler will be developed, which recognizes information from the end systems. A demonstrator will be implemented by both partners.

Methods applied
  • System design and modeling
  • Event-driven simulation using IKRSimLib
  • Prototypic implementation

Contact Us

 

Institute of Communication Networks and Computer Engineering

Pfaffenwaldring 47, 70569 Stuttgart

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