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Foto: Judith Kraft

2017

S. Dräxler, H. Karl, M. Peuster, H. Razzaghi Kouchaksaraei, M. Bredel, J. Lessmann, T. Soenen, W. Tavernier, S. Mendel-Brin, G. Xilouris: SONATA: Service Programming and Orchestration for Virtualized Software Networks. Accepted in 4th International Workshop on 5G Architecture (WT01-5GArch 2017), Paris, May 2017.

A. Schwabe, E. Rojas, H. Karl: Minimizing Downtimes: Us- ing Dynamic Reconfiguration and State Management in SDN Networks in 3rd IEEE Conference on Network Softwarization (NetSoft 2017), Bologna, Italy, July 2017.

S. Dräxler, H. Karl, Z. Á. Mann: Joint Optimization of Scaling and Placement of Virtual Network Services. Accepted in 17th IEEE/ACM International Symposium on Cluster, Cloud and Grid Computing (CCGrid 2017).

2016

S. v. Rossem, W. Tavernier, M. Peuster, D. Colle, M. Pickavet and P. Demeester: Monitoring and debugging using an SDK for NFV-powered telecom applications. Accepted in IEEE Conference on Network Function Virtualization and Software Defined Network (NFV-SDN) (Demo), November 2016.

M. Peuster, H. Karl, and S. v. Rossem: MeDICINE: Rapid Prototyping of Production-Ready Network Services in Multi-PoP Environments. Accepted in IEEE Conference on Network Function Virtualization and Software Defined Network (NFV-SDN), November 2016.

M. Peuster, H. Karl: Understand Your Chains: Towards Performance Profile-based Network Service Management. Accepted in Fifth European Workshop on Software Defined Networks (EWSDN), IEEE, October 2016.

S. Auroux, D. Parruca, H. Karl: Joint real-time scheduling and interference coordination for wireless factory automation. In Proceedings of the 27th IEEE International Symposium on Personal, Indoor and Mobile Radio Communications (PIMRC), September 2016.

A. Schwabe, P. A. Aranda Gutiérrez, H. Karl: Composition of SDN applications: Options/challenges for real implementations., July 2016.

P. A. A. Gutiérrez, E. Rojas, A. Schwabe, C. Stritzke, R. Doriguzzi-Corin, A. Leckey, G. Petralia, A. Marsico, K. Phemius, S. Tamurejo: NetIDE: All-in-one framework for next generation, composed SDN applications. 2016 IEEE NetSoft Conference and Workshops (NetSoft), Seoul, 2016, pp. 355-356, June 2016.

M. Peuster, H. Karl: "E-State: Distributed State Management in Elastic Network Function Deployments". In IEEE 2nd Conference on Network Softwarization (NetSoft 2016), June 2016.

S. Mehraghdam, H. Karl: "Placement of Services with Flexible Structures Specified by a YANG Data Model". In IEEE 2nd Conference on Network Softwarization (NetSoft), June 2016. Best student paper award!

M. Peuster, H. Karl, A. Redondi, A. Capone: "Demonstrating On-Demand Cell Switching with a Two-Layer Mobile Network Testbed". In 2016 IEEE Conference on Computer Communications (INFOCOM) Demo Session, April 2016.

A. Marsico, R. Doriguzzi-Corin, M. Gerola, D. Siracusa, A. Schwabe: A non-disruptive automated approach to update SDN applications at runtime. In NOMS 2016 - 2016 IEEE/IFIP Network Operations and Management Symposium, Istanbul, 2016, pp. 1007-1008, April 2016.

R. Doriguzzi-Corin, D. Siracusa, E. Salvador, A. Schwabe: Empowering network operating systems with memory management techniques. NOMS 2016 - 2016 IEEE/IFIP Network Operations and Management Symposium, Istanbul, 2016, pp. 740-744, April 2016.

2015

A. Schwabe, H. Karl: "Topology model to generate realistic latency for simulations". In IEEE International Conference on Communications, 2015.

M. Peuster, H. Karl: "An Architecture for Energy-aware On-demand Mobile Network Management". In Proceedings of the 5th Workshop on All Things Cellular: Operations, Applications and Challenges, 2015.

M. Dräxler, J. Blobel, H. Karl: "Anticipatory Download Scheduling in Wireless Video Streaming with Uncertain Data Rate Prediction". In Proc. 8th IFIP Wireless and Mobile Networking Conference (WMNC), 2015.

S. Auroux, H. Karl: "Flexible Reassignment of Flow Processing-aware Controllers in Future Wireless Networks". In Proceedings of the 26th IEEE International Symposium on Personal, Indoor and Mobile Radio Communications (PIMRC), 2015.

 P. Wette, H. Karl, "HybridTE: Traffic Engineering for Very Low-Cost Software-Defined Data-Center Networks". In Proc. European Workshop on Software-Defined Networks (EWSDN), 2015. Best paper award!

S. Auroux, M. Dräxler, A. Morelli, V. Mancuso: "Dynamic Network Reconfiguration in Wireless DenseNets with the CROWD SDN Architecture". In European Conference on Networks and Communications (EuCNC) 2015.

P. A. Aranda Gutierrez, H. Karl, E. Rojas and A. Leckey: "On Network Application Representation and Controller Independence in SDN". In Proc. European Conference on Networks and Communications (EuCNC), 2015.

S. Auroux, H. Karl: "Efficient Flow Processing-aware Controller Placement in Future Wireless Networks". In Proceedings of IEEE Wireless Communications and Networking Conference (WCNC), 2015.

M. Dräxler, J. Blobel, P. Dreimann, S. Valentin, H. Karl: "SmarterPhones: Anticipatory Download Scheduling for Wireless Video Streaming". In International Conference on Networked Systems (NetSys) 2015.

2014

M. Keller, C. Robbert, H. Karl: Template Embedding: Using Application Architecture to Allocate Resources in Distributed Clouds. In the 7th International Conference on Utility and Cloud Computing (UCC). (2014)

H. Karl, A. Schwabe: "Using MAC addresses as efficient routing labels in data centers". In Proceedings of the third workshop on Hot topics in software defined networking (HotSDN '14).

M. Dräxler, P. Dreimann, H. Karl: "Anticipatory Power Cycling of Mobile Network Equipment for High Demand Multimedia Traffic". In IEEE Online Conference on Green Communications (IEEE Online GreenComm'14).

J. Blanckenstein, H. Karl: "Energy-Efficient Clock Synchronization using Wake-up Receivers". In 22nd International Conference on Software, Telecommunications and Computer Networks (SoftCOM2014).

J. Künsemöller, S. Brangewitz, H. Karl, C.-J. Haake: "Provider Competition in Infrastructure-as-a-Service". In IEEE SCC 2014.

F. Beister, H. Karl: "Predicting mobile video inter-download times with Hidden Markov Models". In 7th IEEE International Workshop on Selected Topics in Wireless and Mobile computing (STWiMob 2014), 2014.

F. Beister: "Analyzing user video download behavior with clustering and Hidden Markov Models". In 1st KuVS Workshop on Anticipatory Networks, 2014.

M. Dräxler, H. Karl: "SmarterPhones: Anticipatory Download Scheduling for Segmented Wireless Video Streaming". In 1st KuVS Workshop on Anticipatory Networks. (2014).

S. Mehraghdam, M. Keller, H. Karl: "Specifying and Placing Chains of Virtual Network Functions". In 2014 IEEE 3rd International Conference on Cloud Networking (CloudNet). (2014).

S. Auroux, H. Karl: "Flow processing-aware Controller Placement in Wireless DenseNets". In Proceedings of the 25th IEEE International Symposium on Personal, Indoor and Mobile Radio Communications (PIMRC), 2014.

P. Wette, M. Dräxler, A. Schwabe, F. Wallaschek, M. Hassan Zahraee, H. Karl: "MaxiNet: Distributed Emulation of Software-Defined Networks". In IFIP Networking 2014 Conference (Networking 2014).

P. Wette, H. Karl: "Using Application Layer Knowledge in Routing and Wavelength Assignment Algorithms". In Proceedings of the IEEE International Conference on Communications 2014.

M. Keller, H. Karl: "Response Time-Optimized Distributed Cloud Resource Allocation". In Proceedings of the 2014 ACM SIGCOMM workshop on Distributed cloud computing.

M. Dräxler, H. Karl: "Feasibility of Base Station Coordination and Dynamic Backhaul Network Configuration in Backhaul Networks with Limited Capacity". In European Wireless 2014 (EW2014).

M. Herlich, H. Karl: "Analytic Quantification of Outage Probability and Radiated Power of Cooperative Base Stations". In Proceedings of the International Workshop on Wireless Networks: Communication, Cooperation and Competition (WNC3), 2014.

2013

J. Künsemöller, N. Zhang, J. Soares: "ISP business models in caching". In ICDE Workshops 2013.

M. Keller, S. Pawlik, P. Pietrzk, H. Karl: "A Local Heuristic for Latency-Optimized Distributed Cloud Deployment." In Proceedings of the 6th International Conference on Utility and Cloud Computing (UCC) workshop on Distributed cloud computing, 2013.

M. Keller, C. Robbert, M. Peuster, H. Karl: "A Topology-Aware Adaptive Deployment Framework for Elastic Applications". In Proceedings of the 17th International Conference on Intelligence in Next Generation Networks (ICIN) 2013.

M. Keller, C. Robbert, M. Peuster: "An Evaluation Testbed for Adaptive, Topology-Aware Deployment of Elastic Applications". In Proceedings of the 2013 ACM SIGCOMM (Demonstration), Hong Kong/China 2013.

H. Ali-Ahmad, C. Cicconetti, A. de la Oliva, M. Dräxler, R. Gupta, V. Mancuso, L. Roullet, V. Sciancalepore: "CROWD: An SDN Approach for DenseNets". In Second European Workshop on Software Defined Networks (2013).

J. Blanckenstein, J. Garcia-Jimenez, J. Klaue, H. Karl: "A Scalable Redundant TDMA Protocol for High-density WSNs Inside an Aircraft". In Proc. realWSN, Sept. 2013.

T. Hohenberger, M. Herlich, H. Karl: "Trade-off between Latency and Coverage in Cooperative Radio Access Networks". In Proceedings of the International Conference on Advanced Networks and Telecommunication Systems (ANTS), 2013.

M. Herlich, H. Karl: "Energy-Efficient Assignment of User Equipment to Cooperative Base Stations". In Proceedings of the Tenth International Symposium on Wireless Communication Systems (ISWCS), 2013.

P. Wette, H. Karl: "Which Flows Are Hiding Behind My Wildcard Rule? Adding Packet Sampling to OpenFlow". In Proceedings of the ACM SIGCOMM 2013 conference on Applications, technologies, architectures, and protocols for computer communication.

M. Dräxler, H. Karl: "Cross-Layer Scheduling for Multi-Quality Video Streaming in Cellular Wireless Networks". In Proceedings of the 9th IEEE International Wireless Communications and Mobile Computing Conference (IWCMC 2013).

C. Cicconetti, A. Morelli, M. Dräxler, H. Karl, V. Mancuso, V. Sciancalepore, R. Gupta, A. de la Oliva, I. Sánchez, P. Serrano, L. Roullet: "The Playground of Wireless Dense Networks of the Future". In Future Network and MobileSummit 2013.

P. Wette, H. Karl: "On the Quality of Selfish Virtual Topology Reconfiguration in IP-over-WDM Networks". In Proceedings of the 19th International Workshop on Local and Metropolitan Area Networks (IEEE LANMAN 2013). 

P. Wette, H. Karl: "Incorporating feedback from application layer into routing and wavelength assignment algorithms". In Proceedings of the 32nd IEEE International Conference on Computer Communications (Infocom 2013).

P. Wette, K. Graffi: "Adding Capacity-Aware Storage Indirection to Homogeneous Distributed Hash Tables". In Proceedings of the Conference on Networked Systems (NetSys 2013).

J. Künsemöller, N. Zhang, J. Soares: "ISP Business Models in Caching". In Proc. 29th Intl. Conference on Data Engineering, Workshops (ICDEW 2013).

2012

J. Künsemöller, H. Karl: "On Local Separation of Processing and Storage in Infrastructure-as-a-Service". In Proc. 9th Intl. Conference on Economics of Grids, Clouds, Systems, and Services (GECON 2012), Springer LNCS 7714, pp. 125-138.

M. Dräxler, H. Karl: "Efficiency of On-Path and Off-Path Caching Strategies in Information Centric Networks", IEEE International Conference on Green Computing and Communications (GreenCom 2012).

C. Dannewitz, M. Herlich, H. Karl: "OpenNetInf - Prototyping an Information-Centric Network Architecture", Proceedings of the 5th International Workshop on Architectures, Services and Applications for the Next Generation Internet 2012.

A. de la Oliva, A. Morelli, V. Mancuso, M. Dräxler, T. Hentschel, T. Melia, P. Seite, C. Cicconetti: "Denser networks for the Future Internet, the CROWD approach", MONAMI 2012 OConS Workshop: Workshop on Open Connectivity Services for the Future Internet.

M. Dräxler, T. Biermann, H. Karl, W. Kellerer: "Cooperating Base Station Set Selection and Network Reconfiguration in Limited Backhaul Networks", Proc. IEEE 23nd International Symposium on Personal, Indoor and Mobile Radio Communications (PIMRC 2012), Sydney, Australia, September 09-12, 2012.

M. Herlich, H. Karl: “Average and competitive analysis of latency and power consumption of a queuing system with a sleep mode,” in Proceedings of the 3rd International Conference on Future Energy Systems: Where Energy, Computing and Communication Meet, 2012

T. Volkhausen, K. Dridger, H. S. Lichte, H. Karl: "Efficient Cooperative Relaying in Wireless Multi-Hop Networks with Low-Cost WiFi Hardware", Proc. Workshop on Wireless Network Measurements (WiNMee).

T. Volkhausen, K. Schinköthe, H. Karl: "Quantization Techniques for Accurate Soft Message Combining", Proc. IEEE Wireless Communications and Networking Conference (WCNC).

J. Blanckenstein, J. Klaue, H. Karl: "Energy Efficient Clustering using a Wake-up Receiver", in Proc. European  Wireless.

M. Dräxler, F. Beister, S. Kruska, J. Aelken, H. Karl: "Using OMNeT++ for Energy Optimization Simulations in Mobile Core Networks", Proceedings of the 5th International ICST Conference on Simulation Tools and Techniques (SIMUTOOLS).

W. Kellerer, W. Kiess, L. Scalia, T. Biermann, C. Choi,  K. Kozu: "Novel Cellular Optical Access Network and Convergence with FTTH", Proc. Optical Fiber Communication Conference and Exposition (OFC) and The National Fiber Optic Engineers Conference (NFOEC).

2011

M. Herlich, H. Karl: “Reducing power consumption of mobile access networks with cooperation" in Proceedings of the 2nd International Conference on Energy-Efficient Computing and Networking.

J. Künsemöller, H. Karl: "A Game-Theoretical Approach to the Benefits of Cloud Computing" in Proc. 8th Intl. Workshop on Economics of Grids, Clouds, Systems, and Services (GECON 2011).

T. Volkhausen, K. Schinköthe, H. Karl: Coding Opportunities from Similar Data in Wireless Cooperation Diversity Systems. In Proc. IEEE International Conference on Mobile Ad-hoc and Sensor Systems (MASS 2011).

T. Biermann, L. Scalia, H. Karl: "Designing Optical Metro and Access Networks for Future Cooperative Cellular Systems" in Proc. ACM International Conference on Modeling, Analysis and Simulation of Wireless and Mobile Systems (MSWiM).

C. Choi, Q. Wei, T. Biermann, L. Scalia: "Mobile WDM Backhaul Access Networks with Physical Inter-Base-Station Links for Coordinated Multipoint Transmission/Reception Systems" in Proc. IEEE Global Communications Conference (GLOBECOM).

T. Biermann, L. Scalia, C. Choi, H. Karl, W. Kellerer: "Improving CoMP Cluster Feasibility by Dynamic Serving Base Station Reassignment" in Proc. IEEE International Symposium on Personal, Indoor and Mobile Radio Communications (PIMRC).

C. Choi, L. Scalia, T. Biermann, S. Mizuta: "Coordinated Multipoint Multiuser-MIMO Transmissions over Backhaul-Constrained Mobile Access Networks" in Proc. IEEE International Symposium on Personal, Indoor and Mobile Radio Communications (PIMRC).

M. D'Ambrosio, C. Dannewitz, H. Karl, V. Vercellone: "MDHT: A Hierarchical Name Resolution Service for Information-centric Networks" in Proc. ACM SIGCOMM Workshop on Information-centric Networking.

Rana Azeem M. Khan, Holger Karl: "Multihop Performance of Cooperative Preamble Sampling MAC (CPS-MAC) in Wireless Sensor Networks" in Proc. 10th International conference on Ad Hoc and Wireless Networks (ADHOC-NOW 2011).

T. Biermann, L. Scalia, C. Choi, H. Karl, W. Kellerer: "Backhaul Network Pre-Clustering in Cooperative Cellular Mobile Access Networks" in Proc. IEEE World of Wireless Mobile and Multimedia Networks (WoWMoM).

 M. Herlich, H. Karl: "The Trade-off between Power Consumption and Latency in Computer Networks", In NETWORKING 2011 Workshops. Springer Berlin / Heidelberg, Lecture Notes in Computer Science.

L. Scalia, T. Biermann, C. Choi: "Power-Efficient Mobile Backhaul Design for CoMP Support in Future Wireless Access Systems", Proc. IEEE INFOCOM 2011 Workshop on Green Communications and Networking.

T. Biermann, L. Scalia, J. Widmer, H. Karl: "Backhaul Design and Controller Placement for Cooperative Mobile Access Networks" in Proc. IEEE Vehicular Technology Conference (VTC-Spring).

A. Willig, D. Kipnis, H. Karl: "Segment-Based Packet Combining in a Cluster: To Combine or Not To Combine?" in Proc. of 7th Intl. Conf. on Intelligent Sensors, Sensor Networks and Information Processing (ISSNIP).

2010

Rana Azeem M. Khan, Holger Karl: "Cooperative Communication to Improve Reliability and Efficient Neighborhood Wakeup in Wireless Sensor Networks" in Proc, 4th International Conference on Mobile Ubiquitous Computing (UBICOMM 2010).

H. S. Lichte, H. Frey, H. Karl: “Fading-resistant low-latency broadcasts in wireless multihop networks: The probabilistic cooperation diversity approach,” in Proc. 11th ACM Int. Symp. Mobile Ad Hoc Networking and Computing (MobiHoc).

J. Lischka, H. Karl: "RiaS -- Overlay Topology Creation on a PlanetLab Infrastructure", in Proc. ACM VISA Workshop.

Dereje H. Woldegebreal, H. Karl: ''Energy Efficiency Model of Network-Coded Cooperation in Wireless Sensor Networks", In Proc. Fourth International Conference on Sensor Technologies and Applications (SENSORCOMM 2010).

M. Andree, A. Gebel, H. Karl: "Concept and Prototype for a Real-Time Enabled Publish/Subscribe System", IntelNet-2010, The 2010 International Workshop on Intelligent Sensor and Wireless Networks, in Proc. of the 10th IEEE International Conference on Computer and Information Technology (CIT 2010).

K. Miller, T. Biermann, H. Woesner, H. Karl: "Network Coding in Passive Optical Networks" in Proc. IEEE International Symposium on Network Coding (NetCod).

S. Oberthür, L. Zaremba, H. S. Lichte: “Flexible resource management for self-x systems: An evaluation” in Proc. 13th IEEE Int. Symp. Object/Component/Service-Oriented Real-Time Distributed Computing (ISORC).

C. Dannewitz, T. Biermann, M. Dräxler, F. Beister, H. Karl: "Prototyping with the Future Internet Toolbox" in Proc. 6th International Conference on Testbeds and Research Infrastructures for the Development of Networks & Communities (TridentCom).

T. Biermann, C. Dannewitz, H. Karl: "FIT: Future Internet Toolbox" in Proc. 6th International Conference on Testbeds and Research Infrastructures for the Development of Networks & Communities (TridentCom).

C. Dannewitz, J. Golic, B. Ohlman, B. Ahlgren: "Secure Naming for a Network of Information" in Proc. 13th IEEE Global Internet Symposium 2010.

2009

H. S. Lichte, S. Valentin, H. Karl, I. Aad, J. Widmer: “Analyzing space/capacity tradeoffs of cooperative wireless networks using a probabilistic model of interference” in Proc. 12th Int. Symp. Modeling, Anal. and Simulation of Wireless and Mobile Syst.

C. Dannewitz, D. Warnecke: "Statistics-based ID Management for Load Balancing in Structured P2P Networks" in Proc. 34th IEEE Conference on Local Computer Networks (LCN).

J. Lischka, H. Karl: "A Virtual Network Mapping Algorithm based on Subgraph Isomorphism Detection", in Proc. ACM VISA Workshop.

T. Volkhausen, D. H. Woldegebreal, H. Karl: ''Improving Network Coded Cooperation by Soft Information" in Proc. IEEE International Workshop on Wireless Network Coding (WiNC2009).

T. Biermann, Z. Polgar, H. Karl: "Cooperation and Coding Framework", Proc. International Workshop on the Network of the Future (Future-Net), colocated with IEEE ICC.

S. Valentin, D. H. Woldegebreal, T. Volkhausen, H. Karl: "Combining for cooperative WLANs - A reality check based on prototype measurements", Proc. IEEE Workshop on Cooperative Mobile Networks (CoCoNET2).

T. Biermann, C. Dannewitz, H. Karl: "An Adaptive Resource/Performance Trade-Off for Resolving Complex Queries in P2P Networks", Proc. IEEE International Conference on Communications (ICC).

T. Biermann, A. Schwabe, H. Karl: "Work in Progress: Creating Butterflies in the Core - A Network Coding Extension for MPLS/RSVP-TE", Proc. IFIP/TC6 Networking.

S. Valentin, H. Karl: "Cooperative feedback to improve capacity and error rate in multiuser diversity systems - An OFDM case study", Proc. European Wireless Conference (EW).

H. S. Lichte, J. Weide: “Modeling obstacles in INET/Mobility Framework: Motivation, integration, and performance,” in Proc. 2nd Int. Workshop OMNeT++.

H. S. Lichte, S. Valentin, H. von Malm, H. Karl, A. Bin Sediq, I. Aad: “Rate-per-link adaptation in cooperative wireless networks with multi-rate combining” in Proc. IEEE Int. Conf. Commun.

2008

B. Ahlgren, M. D’Ambrosio, C. Dannewitz, M. Marchisio, I. Marsh, B. Ohlman, K. Pentikousis, R. Rembarz, O. Strandberg, and V. Vercellone: "Design Considerations for a Network of Information" in Proc. of the First International Workshop on Re-Architecting the Internet (ReArch2008).

S. Valentin, H. S. Lichte, H. Karl, I. Aad, L. Loyola, J. Widmer: "Opportunistic relaying vs. selective cooperation: Analyzing the occurrence-conditioned outage capacity" in Proc. 11th ACM International Conference on Modeling, Analysis and Simulation of Wireless and Mobile Systems (MSWiM).

S. Valentin, T. Volkhausen, F. Atay Onat, H. Yanikomeroglu, H. Karl: "Decoding-based channel estimation for selective cooperation diversity protocols", Proc. IEEE International Symposium on Personal, Indoor and Mobile Radio Communications (PIMRC).

S. Valentin, H. S. Lichte, D. Warneke, T. Biermann, R. Funke, H. Karl: "Mobile cooperative WLANs - MAC and transceiver design, prototyping, and field measurements" in Proc. IEEE Vehicular Technology Conf. (VTC-Fall).

D. H. Woldegebreal, S. Valentin, H. Karl: "Incremental Network Coding in Cooperative Transmission Wireless Networks" in Proc. IEEE Vehicular Technology Conf. (VTC-Fall).

D. Platz, D. H. Woldegebreal, H. Karl: "Random Network Coding in Wireless Sensor Networks: Energy Efficiency via Cross-Layer Approach'' in Proc. 10th IEEE ISSSTA 2008.

C. Dannewitz, K. Pentikousis, R. Rembarz, É. Renault, O. Strandberg, J. Ubillos: "Scenarios and Research Issues for a Network of Information" in Proc. of the 4th International Mobile Multimedia Communications Conference, July 2008.

C. Dannewitz, H. Karl, D. Warneke: "Service Platform for Real-World / Internet Integration in Mobile Applications" in Proc. of the 13. Mobilfunktagung, 2008.

S. Valentin, T. Volkhausen, F. Atay Onat, H. Yanikomeroglu, H. Karl: "Enabling partial forwarding by decoding-based one and two-stage selective cooperation'' in Proc. IEEE Cognitive and Cooperative Wireless Networks (CoCoNET) Workshop collocated with IEEE ICC, 2008.

S. Valentin, T. Freitag, H. Karl: "Integrating multiuser dynamic OFDMA into IEEE 802.11 WLANs - LLC/MAC extensions and system performance", Proc. IEEE International Conference on Communications (ICC), 2008.

H. S. Lichte, S. Valentin, H. Karl, I. Aad, L. Loyola, J. Widmer: "Design and evaluation of a routing-informed cooperative MAC protocol for ad hoc networks," in Proc. Ann. Joint Conf. of the IEEE Computer Societies (INFOCOM).

D. H. Woldegebreal, H. Karl: "Network-Coding-based Cooperative Transmission  in Wireless Sensor Networks: Diversity-Multiplexing tradeoff and Coverage Area Extension", In Proc. 5th European conference on Wireless Sensor Networks (EWSN).

2007

D. H. Woldegebreal, S. Valentin, H. Karl: "Outage Probability Analysis of Cooperative Transmission Protocols without and with Network Coding: Inter-User Channels based Comparison" in Proc. 10th ACM/IEEE International Symposium on Modeling, Analysis and Simulation of Wireless and Mobile Systems (MSWiM).

D. H. Woldegebreal, H. Karl: "Multiple-Access Relay Channel with Network Coding and Non-Ideal Source-Relay Channels" in Proc. 4th IEEE International Symposium on Wireless Communication Systems (ISWCS'07).

S. Valentin, H. v. Malm, H. Karl: "Traffic-aware asymmetric cooperation diversity for media streaming in wireless networks", In Proc. of the 18th Annual IEEE International Symposium on Personal, Indoor and Mobile Radio Communications (PIMRC).

Hermann S. Lichte, S. Valentin, Falk Eitzen, Matthias Stege, Carsten Unger, H. Karl: "Integrating multiuser dynamic OFDMA into IEEE 802.11a and prototyping it on a real-time software-defined radio testbed" in Proc. Intl. Conf. on Testbeds and Research Infrastructures for the Development of Networks and Communities (TridentCom).

L. Feeney, S. Mengesha, B. Cetin, M. Kubisch, D. Hollos, H.  Karl: "Multi-rate relaying for performance improvement in IEEE 802.11 WLANs" in Proc. 5th Intl. Conf. on Wired/Wireless Internet Communications.

D. H. Woldegebreal, H. Karl: ''Network-coding-based adaptive decode and forward cooperative transmission in a wireless networks: outage analysis'', In Proc. 13th European Wireless Conference (EW).

S. Valentin, H. Karl: "Analyzing the effect of asymmetric mobility and channel configurations on the outage performance of coded cooperative systems" in Proc. 13th European Wireless Conference (EW).

S. Valentin, H. Karl: "Effect of user mobility in coded cooperative systems with joint partner and cooperation level selection" in Proc. of IEEE Wireless Communications and Networking Conference (WCNC).

H. Karl: "Optimizing sleeping intervals in preamble sampling MACs for WSNs" in Proc. Kommunikation in verteilten Systemen.

2005

S. Valentin, J. Gross, H. Karl, A. Wolisz: "Adaptive scheduling for heterogeneous traffic flows in cellular wireless OFDM-FDMA systems" in Proc. 10th IFIP international conference on Personal Wireless Communications (PWC).

A. Aguiar, H. Karl, H. Lederer, A. Wolisz: "Channel-Adaptive Schedulers with State-of-the-Art Channel Predictors" in Proc. of European Wireless 2005.

A. Köpke, H. Karl, M. Löbbers: "Using energy where it counts: Protecting important messages in the link layer" in Proc. of the European Workshop on Wireless Sensor Networks, IEEE.

2004

C. Frank, H. Karl: "Consistency Challenges of Service Discovery in Mobile Ad Hoc Networks" in Proc. 7th ACM Intl. Symp. on Modeling, Analysis and Simulation of Wireless and Mobile Systems (MSWiM).

V. Typpö, J. Eisl, J. Höller, R.A. Calvo, H. Karl: "Research Challenges in Mobility and Moving Networks: An Ambient Networks Perspective" in Proc. IFIP World Computer Congress.

E. Carlson, Ch. Bettstetter, H. Karl, C. Prehofer, A. Wolisz: "Distributed Maintenance of Resource Reservation Paths in Multihop 802.11 Networks" in Proc. Vehicular Technology Conference (VTC Fall).

C. Hoene, H. Karl, A. Wolisz: "A Perceptual Quality Model for Adaptive VoIP Applications" in Proceedings of International Symposium on Performance Evaluation of Computer and Telecommunication Systems (SPECTS'04).

S. Mengesha, H. Karl, A. Wolisz: "Capacity Increase of Multi-hop Cellular WLANs Exploiting Data Rate Adaptation and Frequency Recycling" in MedHocNet 2004.

J. Gross, I. Paoluzzi, H. Karl, A. Wolisz: "Throughput Study for a Dynamic OFDM-FDMA System with Inband Signaling" in Proc. Vehicular Technology Conference (VTC Spring).

L. M. Feeney, D. Hollos, M. Kubisch, S. Mengesha, H. Karl: "A Geometric Derivation of the Probability of Finding a Relay in Multi-Rate Networks", In Proc. Third IFIP-TC6 Networking Conf -- Networking 2004.

J. Gross, H. Karl, A. Wolisz: "Throughput Optimization of Dynamic OFDM-FDMA Systems with Inband Signaling" in Proc. of 2nd WiOpt'04 (Modeling and Optimization in Mobile, Ad Hoc and Wireless Networks).

N. Klimin, W. Enkelmann, H. Karl, A. Wolisz: "A Hybrid Approach for Location-based Service Discovery in Vehicular Ad Hoc Networks" in Proc. 1st Intl. Workshop on Intelligent Transportation (WIT).

D. Hollos, H. Karl, A. Wolisz: "Regionalizing Global Optimization Algorithms to Improve the Operation of Large Ad Hoc Networks" in Proc. of IEEE Wireless Communications and Networking Conference.

D. Raguin, M. Kubisch, H. Karl, A. Wolisz: "Queue-driven Cut-through Medium Access in Wireless Ad Hoc Networks" in Proc.IEEE Wireless Communications and Networking Conference (WCNC).

A. Aguiar, H. Karl, A. Wolisz: "Channel Adaptive Techniques in the Presence of Channel Prediction Inaccuracy" in Proc. European Wireless 2004.

E. Carlson, H. Karl, A. Wolisz, C. Prehofer: "Distributed Allocation of Time Slots for Real-Time Traffic in a Wireless Multi-Hop Network" in Proc. European Wireless 2004.

J. Gross, H. Karl, A. Wolisz: "On the effect of inband signaling and realistic channel knowledge on dynamic OFDM-FDMA systems" in Proc. of European Wireless 2004.

A. Köpke, V. Handziski, J.-H. Hauer, H. Karl: "Structuring the Information Flow in Component-Based Protocol Implementations for Wireless Sensor Nodes" in Proc. Work-in-Progress Session of the 1st European Workshop on Wireless Sensor Networks (EWSN), Technical Report TKN-04-001 of Technical University Berlin, Telecommunication Networks Group, pp. 41-45, Berlin, Germany, January 2004.

V. Handziski, A. Köpke, H. Karl, C. Frank, W. Drytkiewicz: "Improving the Energy Efficiency of Directed Diffusion Using Passive Clustering" in H. Karl, A. Willig, and A. Wolisz, editors, Proc. of 1st European Workshop on Wireless Sensor Networks (EWSN).

2003 and earlier

X. Fu, T. Chen, A. Festag, H. Karl, G. Schäfer, C. Fan: "Secure, QoS-enabled Mobility Support for IP-based Networks" in Proc. IP Based Cellular Network Conference (IPCN).

H. Karl, M. Löbbers, T. Nieberg: "A Data Aggregation Framework for Wireless Sensor Networks" in Proc. Dutch Technology Foundation ProRISC Workshop on Circuits, Systems and Signal Processing.

H.-F. Geerdes, H. Karl: "The Potential of Relaying in Cellular Networks" in Proc. Intl. Network Optimization Conf. (INOC).

A. Neumann, X. Fu, H. Karl: "Prototype Implementation and Performance Evaluation of a QoS-Conditionalized Handoff Scheme for Mobile IPv6 Networks" in Proc. IEEE Computer Communications Workshop (CCW).

A. Aguiar, C. Hoene, J. Klaue, H. Karl, H. Miesmer, A. Wolisz: "Channel-aware Schedulers for VoIP and MPEG4 based on Channel Prediction" in Proc. 8th Intl. Workshop on Mobile Multimedia Communications (MoMuC'03).

J. Gross, J. Klaue, H. Karl, A. Wolisz: "Subcarrier allocation for variable bit rate video streams in wireless OFDM systems" in Proc. Vehicular Technology Conference (VTC Fall).

M. Kubisch, H. Karl, A. Wolisz: "Are Classes of Nodes with Different Power Amplifiers Good for Wireless Multi-hop Networks?" in Proc. Personal Wireless Communications (PWC).

M. Savoric, H. Karl, A. Wolisz: "Selected properties of a joint congestion controller for TCP connections" in Proc. Intl. Teletraffic Congress (ITC).

J. Klaue, J. Gross, H. Karl, A. Wolisz: "Semantic-Aware Link Layer Scheduling of MPEG-4 Video Streams in Wireless Systems" in Proc. Applications and Services in Wireless Networks (ASWN).

S. Sroka, H. Karl: "Performance Evaluation of a QoS-Aware Handover Mechanism" in Proc. 8th IEEE Symp. on Computers and Communications.

J. Gross, H. Karl, F. Fitzek, A. Wolisz: "Comparison of heuristic and optimal subcarrier assignment algorithms" in Proc. Intl.Conf. on Wireless Networks (ICWN).

A. Aguiar, H. Karl, H. Miesmer, A. Wolisz: "Distributed Allocation of Time Slots for Real-Time Traffic in a Wireless Multi-Hop Network" in Proc. Intl. Conf. on Wireless Networks (ICWN).

S. Mengesha, H. Karl: "Relay Routing and Scheduling for Capacity Improvement in Cellular WLANs" in Proc. Modeling and Optimization in Mobile, Ad Hoc and Wireless Networks (WiOpt'03).

M. Kubisch, H. Karl, A. Wolisz, L.C. Zhong, J. Rabaey: "Distributed Algorithms for Transmission Power Control in Wireless Sensor Networks" in Proc. IEEE Wireless Communications and Networking Conference (WCNC).

A. Köpke, A. Willig, H. Karl: "Chaotic Maps as Parsimonious Bit Error Models of Wireless Channels" in Proc. IEEE INFOCOM 2003.

M. Kubisch, S. Mengesha, D. Hollos, H. Karl, A. Wolisz: "Applying ad-hoc relaying to improve capacity, energy efficiency, and immission in infrastructure-based WLANs" in K. Irmscher, editor, Proc. Kommunikation in Verteilten Systemen (KiVS).

A. Festag, H.Karl, A. Wolisz: "Classification and Evaluation of Multicast-Based Mobility Support in All-IP Cellular Networks" in K. Irmscher, editor, Proc. Kommunikation in Verteilten Systemen (KiVS).

A. Aguiar, H. Karl, A. Wolisz: "Effects of Prediction Inaccuracy on the Performance of Channel-State-Aware Link Layer Schedulers" in Proc. 1st Intl. Conf. on Mobile and Ubiquitous Multimedia 2002.

T. Ngo Quynh, H. Karl, A. Wolisz, K. Rebensburg: "New Scheduling Algorithm for Providing Proportional Jitter in Differentiated Service Network" in Proc. IST Mobile & Wireless Telecommunications Summit 2002.

X. Fu, H. Karl, C. Kappler: "QoS-Conditionalized Handoff for Mobile IPv6" in Proc. 2nd IFIP-TC6 Networking Conf. (Networking2002), Volume 2345 of Lecture Notes in Computer Sciece (LNCS) 2002.

T. Ngo Quynh, H. Karl, A. Wolisz, K. Rebensburg: "Using only Proportional Jitter Scheduling at the boundary of a Differentiated Service Network: simple and efficient" in Proc. 2nd European Conf. on Universal Multiservice Networks (ECUMN) 2002.

D. Hollos, H. Karl: "A protocol extension to HiperLAN/2 to support single-relay networks" in Proc. 1st German Workshop on Ad-Hoc Networks 2002.

H. Karl, S. Mengesha: "Analysing Capacity Improvements in Wireless Networks by Relaying" in Proc. of IEEE Intl. Conf. on Wireless LANs and Home Networks 2001.

T. Ngo-Quynh, H. Karl, A. Wolisz, K. Rebensburg: "The Influence of Proportional Jitter and Delay on End to End Delay in Differentiated Service Network" in Proc. IEEE Intl. Symp. on Network Computing and Applications NCA 2001.

S. Mengesha, H. Karl, A. Wolisz: "Improving Goodput by Relaying in Transmission-Power-Limited Wireless Systems" in Proc. of Informatik 2001.

T. Ngo-Quynh, H. Karl, A. Wolisz, K. Rebensburg: "Relative Jitter Packet Scheduling for Differentiated Services" in Proc. 9th IFIP Conf. on Performance Modelling and Evaluation of ATM & IP Networks 2001.

H. Karl, G. Schäfer: "Location Privacy for Mobile Internet Access. Presentation" in Proc. of IP Based Cellular Network Conf. (IPCN 2001).

H. Karl: "Towards Quality of Service for Parallel Computing: An Overview of the MILAN Project" in Proc. the 7th Intl. Conf. on High-Performance Computing and Networking Europe 1999.

H. Karl, M. Werner, L. Küttner: "An Experimental Investigation of Message Latencies in the Totem Protocol in the Presence of Faults" in Proc. Euromicro '98.

H. Karl, M. Werner: "An Optimal Checkpointing Interval for Real-Time Systems" in Proc. the Intl. Conf. on Parallel and Distributed Processing and Applications 1998.

A. Baratloo, M. Karaul., H. Karl, Z. Kedem: "An Infrastructure for Network Computing with Java Applets" in Proc. of ACM Workshop on Java for High-Performance Network Computing, 1998.

H. Karl: "Bridging the Gap between Distributed Shared Memory and Message Passing" in ACM Workshop on Java for High-Performance Network Computing, 1998.

H. Karl, A. Polze, M. Werner: "Predictable Network Computing using Message-driven Scheduling" in Proc. the Workshop on Run-Time Systems for Parallel Programming, Tech. Report of the Vrije Universitaet Amsterdam, 1997.

B. Dreier, A. Huber, H. Karl, T. Ungerer, M. Zahn: "ReGTime--Rent Gigaflops someTime" in Proc. the Trends in Distributed Systems Workshop, 1996.

Die Universität der Informationsgesellschaft