Prof. Dr. rer. nat. Barbara Staehle

• Using Buffered Playtime for QoE-Oriented Resource Management of YouTube Video Streaming Wamser, Florian; Hock, David; Seufert, Michael; Staehle, Barbara; Pries, Rastin; Tran-Gia, Phuoc in Transactions on Emerging Telecommunications Technologies (2013). 24 288–302.
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  YouTube is the most important online platform for streaming video clips. The popularity and the continuously increasing number of users pose new challenges for Internet Service Providers (ISPs). In particular, in access networks where the transmission resources are limited and the providers are interested in reducing their operational expenditure, it is worth to efficiently optimize the network for popular services such as YouTube. In this paper, we propose different resource management mechanisms to improve the Quality of Experience (QoE) of YouTube users. In particular, we investigate the benefit of cross-layer resource management actions at the client and in the access network for YouTube video streaming. The proposed algorithms are evaluated in a wireless mesh testbed. The results show how to improve the YouTube QoE for the users with the help of client-based or network-based control actions.

  @article{info3-article-2013-109, abstract = {YouTube is the most important online platform for streaming video clips. The popularity and the continuously increasing number of users pose new challenges for Internet Service Providers (ISPs). In particular, in access networks where the transmission resources are limited and the providers are interested in reducing their operational expenditure, it is worth to efficiently optimize the network for popular services such as YouTube. In this paper, we propose different resource management mechanisms to improve the Quality of Experience (QoE) of YouTube users. In particular, we investigate the benefit of cross-layer resource management actions at the client and in the access network for YouTube video streaming. The proposed algorithms are evaluated in a wireless mesh testbed. The results show how to improve the YouTube QoE for the users with the help of client-based or network-based control actions.}, author = {Wamser, Florian and Hock, David and Seufert, Michael and Staehle, Barbara and Pries, Rastin and Tran-Gia, Phuoc}, journal = {Transactions on Emerging Telecommunications Technologies}, keywords = {sys:hidden:article}, month = 4, pages = {288–302}, title = {Using Buffered Playtime for QoE-Oriented Resource Management of YouTube Video Streaming}, volume = 24, year = 2013 }

  %0 Journal Article %1 info3-article-2013-109 %A Wamser, Florian %A Hock, David %A Seufert, Michael %A Staehle, Barbara %A Pries, Rastin %A Tran-Gia, Phuoc %D 2013 %J Transactions on Emerging Telecommunications Technologies %P 288–302 %T Using Buffered Playtime for QoE-Oriented Resource Management of YouTube Video Streaming %V 24 %X YouTube is the most important online platform for streaming video clips. The popularity and the continuously increasing number of users pose new challenges for Internet Service Providers (ISPs). In particular, in access networks where the transmission resources are limited and the providers are interested in reducing their operational expenditure, it is worth to efficiently optimize the network for popular services such as YouTube. In this paper, we propose different resource management mechanisms to improve the Quality of Experience (QoE) of YouTube users. In particular, we investigate the benefit of cross-layer resource management actions at the client and in the access network for YouTube video streaming. The proposed algorithms are evaluated in a wireless mesh testbed. The results show how to improve the YouTube QoE for the users with the help of client-based or network-based control actions.

• Intra-Mesh Congestion Control for IEEE 802.11s Wireless Mesh Networks Staehle, Barbara; Bahr, Michael; Fu, Desheng; Staehle, Dirk in International Conference on Computer and Communication Networks 2012 (ICCCN 2012) (2012).
  • [ BibTeX ]
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  @inproceedings{info3-inproceedings-2012-453, address = {Munich, Germany}, author = {Staehle, Barbara and Bahr, Michael and Fu, Desheng and Staehle, Dirk}, booktitle = {International Conference on Computer and Communication Networks 2012 (ICCCN 2012)}, keywords = {sys:hidden:inproceedings}, month = 7, title = {Intra-Mesh Congestion Control for IEEE 802.11s Wireless Mesh Networks}, year = 2012 }

  %0 Conference Paper %1 info3-inproceedings-2012-453 %A Staehle, Barbara %A Bahr, Michael %A Fu, Desheng %A Staehle, Dirk %B International Conference on Computer and Communication Networks 2012 (ICCCN 2012) %C Munich, Germany %D 2012 %T Intra-Mesh Congestion Control for IEEE 802.11s Wireless Mesh Networks
• Quality of Experience Management for YouTube: Clouds, FoG and the AquareYoum Hoßfeld, Tobias; Liers, Florian; Schatz, Raimund; Staehle, Barbara; Staehle, Dirk; Volkert, Thomas; Wamser, Florian in PIK - Praxis der Informationverarbeitung und -kommunikation (PIK) (2012).
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  Over the last decade, Quality of Experience (QoE) has become a new, central paradigm for understanding the quality of networks and services. In particular, the concept has attracted the interest of communication network and service providers, since being able to guarantee good QoE to customers provides an opportunity for differentiation. In this paper we investigate the potential as well as the implementation challenges of QoE management in the Internet. Using YouTube video streaming service as example, we discuss the different elements that are required for the realization of the paradigm-shift towards truly user-centric network orchestration. To this end, we elaborate QoE management requirements for two complementary network scenarios (wireless mesh Internet access networks vs. global Internet delivery) and provide a QoE model for YouTube taking into account impairments like stalling and initial delay. We present two YouTube QoE monitoring approaches operating on the network and the end user level. Finally, we demonstrate how QoE can be dynamically optimized in both network scenarios with two exemplary concepts, AquareYoum and FoG, respectively. Our results show how QoE management can truly improve the user experience while at the same time increase the efficiency of network resource allocation.

  @article{info3-article-2012-103, abstract = {Over the last decade, Quality of Experience (QoE) has become a new, central paradigm for understanding the quality of networks and services. In particular, the concept has attracted the interest of communication network and service providers, since being able to guarantee good QoE to customers provides an opportunity for differentiation. In this paper we investigate the potential as well as the implementation challenges of QoE management in the Internet. Using YouTube video streaming service as example, we discuss the different elements that are required for the realization of the paradigm-shift towards truly user-centric network orchestration. To this end, we elaborate QoE management requirements for two complementary network scenarios (wireless mesh Internet access networks vs. global Internet delivery) and provide a QoE model for YouTube taking into account impairments like stalling and initial delay. We present two YouTube QoE monitoring approaches operating on the network and the end user level. Finally, we demonstrate how QoE can be dynamically optimized in both network scenarios with two exemplary concepts, AquareYoum and FoG, respectively. Our results show how QoE management can truly improve the user experience while at the same time increase the efficiency of network resource allocation.}, author = {Hoßfeld, Tobias and Liers, Florian and Schatz, Raimund and Staehle, Barbara and Staehle, Dirk and Volkert, Thomas and Wamser, Florian}, journal = {PIK - Praxis der Informationverarbeitung und -kommunikation (PIK)}, keywords = {sys:hidden:article}, month = 8, title = {Quality of Experience Management for YouTube: Clouds, FoG and the AquareYoum}, year = 2012 }

  %0 Journal Article %1 info3-article-2012-103 %A Hoßfeld, Tobias %A Liers, Florian %A Schatz, Raimund %A Staehle, Barbara %A Staehle, Dirk %A Volkert, Thomas %A Wamser, Florian %D 2012 %J PIK - Praxis der Informationverarbeitung und -kommunikation (PIK) %T Quality of Experience Management for YouTube: Clouds, FoG and the AquareYoum %X Over the last decade, Quality of Experience (QoE) has become a new, central paradigm for understanding the quality of networks and services. In particular, the concept has attracted the interest of communication network and service providers, since being able to guarantee good QoE to customers provides an opportunity for differentiation. In this paper we investigate the potential as well as the implementation challenges of QoE management in the Internet. Using YouTube video streaming service as example, we discuss the different elements that are required for the realization of the paradigm-shift towards truly user-centric network orchestration. To this end, we elaborate QoE management requirements for two complementary network scenarios (wireless mesh Internet access networks vs. global Internet delivery) and provide a QoE model for YouTube taking into account impairments like stalling and initial delay. We present two YouTube QoE monitoring approaches operating on the network and the end user level. Finally, we demonstrate how QoE can be dynamically optimized in both network scenarios with two exemplary concepts, AquareYoum and FoG, respectively. Our results show how QoE management can truly improve the user experience while at the same time increase the efficiency of network resource allocation.

• Potential and Challenges of IEEE 802.11s Intra-Mesh Congestion Control Staehle, Barbara (2011, February 16).
  • [ BibTeX ]
  • [ EndNote ]
  @presentation{info3-talk-2011-406, address = {COST IC090 WiNeMO, Riga, Latvia}, author = {Staehle, Barbara}, keywords = {sys:hidden:presentation}, month = 2, title = {Potential and Challenges of IEEE 802.11s Intra-Mesh Congestion Control}, year = 2011 }

  %0 Generic %1 info3-talk-2011-406 %A Staehle, Barbara %C COST IC090 WiNeMO, Riga, Latvia %D 2011 %T Potential and Challenges of IEEE 802.11s Intra-Mesh Congestion Control
• Modeling and Optimization Methods for Wireless Sensor and Mesh Networks, received outstanding PhD-theses award 2012 at University of Würzburg, and best dissertation award 2012 of the Institute of Computer Science Staehle, Barbara (2011, July).
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  @phdthesis{info3-dissertation-2011-29, author = {Staehle, Barbara}, keywords = {sys:hidden:dissertation}, month = 7, title = {Modeling and Optimization Methods for Wireless Sensor and Mesh Networks, received outstanding PhD-theses award 2012 at University of Würzburg, and best dissertation award 2012 of the Institute of Computer Science}, year = 2011 }

  %0 Thesis %1 info3-dissertation-2011-29 %A Staehle, Barbara %D 2011 %T Modeling and Optimization Methods for Wireless Sensor and Mesh Networks, received outstanding PhD-theses award 2012 at University of Würzburg, and best dissertation award 2012 of the Institute of Computer Science
• Aquarema in Action: Improving the YouTube QoE in Wireless Mesh Networks Staehle, Barbara; Hirth, Matthias; Pries, Rastin; Wamser, Florian; Staehle, Dirk in Baltic Congress on Future Internet Communications (BCFIC) (2011).
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  Internet access networks in general and wireless mesh access networks in particular, are the bottleneck of today’s communication networks and consequently most strongly responsible for determining the user satisfaction. The limited bandwidth and the fact that access network are most often used as mere bit pipes are however unfavorable for the users’ quality of experience (QoE). The lack of application-specific service guarantees is especially inadequate in the face of an increasing degree of heterogeneity of Internet applications and their individual service requirements. Application and quality of experience resource management, Aquarema for short, addresses this challenge by enabling application specific network resource management and thereby improves the user QoE. This is achieved by the interaction of application comfort (AC) monitoring tools, running at the clients, and a network advisor which may trigger different resource management tools. AC quantifies how well an application is running and in particular, enables a prediction of the user experience, thereby allowing the network advisor to act upon an imminent QoE degradation. We demonstrate the appeal of Aquarema at the example of YouTube video streaming in a congested IEEE 802.11 based mesh testbed where AC-aware traffic shaping guarantees the successful video playback.

  @inproceedings{info3-inproceedings-2011-403, abstract = {Internet access networks in general and wireless mesh access networks in particular, are the bottleneck of today’s communication networks and consequently most strongly responsible for determining the user satisfaction. The limited bandwidth and the fact that access network are most often used as mere bit pipes are however unfavorable for the users’ quality of experience (QoE). The lack of application-specific service guarantees is especially inadequate in the face of an increasing degree of heterogeneity of Internet applications and their individual service requirements. Application and quality of experience resource management, Aquarema for short, addresses this challenge by enabling application specific network resource management and thereby improves the user QoE. This is achieved by the interaction of application comfort (AC) monitoring tools, running at the clients, and a network advisor which may trigger different resource management tools. AC quantifies how well an application is running and in particular, enables a prediction of the user experience, thereby allowing the network advisor to act upon an imminent QoE degradation. We demonstrate the appeal of Aquarema at the example of YouTube video streaming in a congested IEEE 802.11 based mesh testbed where AC-aware traffic shaping guarantees the successful video playback.}, address = {Riga, Latvia}, author = {Staehle, Barbara and Hirth, Matthias and Pries, Rastin and Wamser, Florian and Staehle, Dirk}, booktitle = {Baltic Congress on Future Internet Communications (BCFIC)}, keywords = {demobenefit}, month = 2, title = {Aquarema in Action: Improving the YouTube QoE in Wireless Mesh Networks}, year = 2011 }

  %0 Conference Paper %1 info3-inproceedings-2011-403 %A Staehle, Barbara %A Hirth, Matthias %A Pries, Rastin %A Wamser, Florian %A Staehle, Dirk %B Baltic Congress on Future Internet Communications (BCFIC) %C Riga, Latvia %D 2011 %T Aquarema in Action: Improving the YouTube QoE in Wireless Mesh Networks %X Internet access networks in general and wireless mesh access networks in particular, are the bottleneck of today’s communication networks and consequently most strongly responsible for determining the user satisfaction. The limited bandwidth and the fact that access network are most often used as mere bit pipes are however unfavorable for the users’ quality of experience (QoE). The lack of application-specific service guarantees is especially inadequate in the face of an increasing degree of heterogeneity of Internet applications and their individual service requirements. Application and quality of experience resource management, Aquarema for short, addresses this challenge by enabling application specific network resource management and thereby improves the user QoE. This is achieved by the interaction of application comfort (AC) monitoring tools, running at the clients, and a network advisor which may trigger different resource management tools. AC quantifies how well an application is running and in particular, enables a prediction of the user experience, thereby allowing the network advisor to act upon an imminent QoE degradation. We demonstrate the appeal of Aquarema at the example of YouTube video streaming in a congested IEEE 802.11 based mesh testbed where AC-aware traffic shaping guarantees the successful video playback.
• Application-Aware Self-Optimization of Wireless Mesh Networks with AquareYoum and DES-SERT Staehle, Barbara; Wamser, Florian; Deschner, Sebastian; Blenk, Andreas; Staehle, Dirk; Hahm, Oliver; Schmittberger, Nicolai; Günes, Mesut in Euroview 2011 (2011).
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  @inproceedings{info3-inproceedings-2011-425, address = {Würzburg, Germany}, author = {Staehle, Barbara and Wamser, Florian and Deschner, Sebastian and Blenk, Andreas and Staehle, Dirk and Hahm, Oliver and Schmittberger, Nicolai and Günes, Mesut}, booktitle = {Euroview 2011}, keywords = {demobenefit}, month = 8, title = {Application-Aware Self-Optimization of Wireless Mesh Networks with AquareYoum and DES-SERT}, year = 2011 }

  %0 Conference Paper %1 info3-inproceedings-2011-425 %A Staehle, Barbara %A Wamser, Florian %A Deschner, Sebastian %A Blenk, Andreas %A Staehle, Dirk %A Hahm, Oliver %A Schmittberger, Nicolai %A Günes, Mesut %B Euroview 2011 %C Würzburg, Germany %D 2011 %T Application-Aware Self-Optimization of Wireless Mesh Networks with AquareYoum and DES-SERT
• Aquarema in Action: Improving the YouTube QoE in Wireless Mesh Networks Staehle, Barbara (2011, February 16).
  • [ BibTeX ]
  • [ EndNote ]
  @presentation{info3-talk-2011-407, address = {BCFIC, Riga, Latvia}, author = {Staehle, Barbara}, keywords = {demobenefit}, month = 2, title = {Aquarema in Action: Improving the YouTube QoE in Wireless Mesh Networks}, year = 2011 }

  %0 Generic %1 info3-talk-2011-407 %A Staehle, Barbara %C BCFIC, Riga, Latvia %D 2011 %T Aquarema in Action: Improving the YouTube QoE in Wireless Mesh Networks
• AquareYoum: Application and Quality of Experience-Aware Resource Management for YouTube in Wireless Mesh Networks Staehle, Dirk; Staehle, Barbara; Wamser, Florian; Hirth, Matthias; Stezenbach, David; Deschner, Sebastian (2011, March).
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  @misc{info3-software-2011-5, address = {Kiel, Germany}, author = {Staehle, Dirk and Staehle, Barbara and Wamser, Florian and Hirth, Matthias and Stezenbach, David and Deschner, Sebastian}, booktitle = {PIK - Praxis der Informationsverarbeitung und Kommunikation}, keywords = {sys:hidden:software}, month = 3, title = {AquareYoum: Application and Quality of Experience-Aware Resource Management for YouTube in Wireless Mesh Networks}, year = 2011 }

  %0 Generic %1 info3-software-2011-5 %A Staehle, Dirk %A Staehle, Barbara %A Wamser, Florian %A Hirth, Matthias %A Stezenbach, David %A Deschner, Sebastian %B PIK - Praxis der Informationsverarbeitung und Kommunikation %C Kiel, Germany %D 2011 %T AquareYoum: Application and Quality of Experience-Aware Resource Management for YouTube in Wireless Mesh Networks
• On Max-Min Fair Flow Optimization in Wireless Mesh Networks Pióro, Michał; Zotkiewicz, Mateusz; Staehle, Barbara; Staehle, Dirk; Yuan, Di in Ad Hoc Networks, Special Issue on Models and Algorithms for Wireless Mesh Networks (2011).
  • [ Abstract ]
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  The paper is devoted to WMN modeling using mixed-integer programming (MIP) formulations that allow to precisely characterize the link data rate capacity and transmission scheduling within time slots. Such MIP models are formulated for several cases of the modulation and coding schemes (MCS) assignment. We present a general way of solving the MMF traffic objective for WMN and use it for the formulated capacity models. Thus the paper combines WMN radio link modeling with a non-standard way of dealing with uncertain traffic, a combination that has not been to our knowledge considered so far in terms of exact optimization models. This combination, involving integer programming, forms the main contribution of the paper. We discuss several ways of solving the considered MMF problems and present an extensive numerical study that illustrates the running time efficiency of the different solution approaches, and the in uence of the MCS selection options and the number of time slots on the traffic performance of a WMN.

  @article{info3-article-2011-84, abstract = {The paper is devoted to WMN modeling using mixed-integer programming (MIP) formulations that allow to precisely characterize the link data rate capacity and transmission scheduling within time slots. Such MIP models are formulated for several cases of the modulation and coding schemes (MCS) assignment. We present a general way of solving the MMF traffic objective for WMN and use it for the formulated capacity models. Thus the paper combines WMN radio link modeling with a non-standard way of dealing with uncertain traffic, a combination that has not been to our knowledge considered so far in terms of exact optimization models. This combination, involving integer programming, forms the main contribution of the paper. We discuss several ways of solving the considered MMF problems and present an extensive numerical study that illustrates the running time efficiency of the different solution approaches, and the in uence of the MCS selection options and the number of time slots on the traffic performance of a WMN.}, author = {Pióro, Michał and Zotkiewicz, Mateusz and Staehle, Barbara and Staehle, Dirk and Yuan, Di}, journal = {Ad Hoc Networks, Special Issue on Models and Algorithms for Wireless Mesh Networks}, keywords = {sys:hidden:article}, title = {On Max-Min Fair Flow Optimization in Wireless Mesh Networks}, year = 2011 }

  %0 Journal Article %1 info3-article-2011-84 %A Pióro, Michał %A Zotkiewicz, Mateusz %A Staehle, Barbara %A Staehle, Dirk %A Yuan, Di %D 2011 %J Ad Hoc Networks, Special Issue on Models and Algorithms for Wireless Mesh Networks %T On Max-Min Fair Flow Optimization in Wireless Mesh Networks %X The paper is devoted to WMN modeling using mixed-integer programming (MIP) formulations that allow to precisely characterize the link data rate capacity and transmission scheduling within time slots. Such MIP models are formulated for several cases of the modulation and coding schemes (MCS) assignment. We present a general way of solving the MMF traffic objective for WMN and use it for the formulated capacity models. Thus the paper combines WMN radio link modeling with a non-standard way of dealing with uncertain traffic, a combination that has not been to our knowledge considered so far in terms of exact optimization models. This combination, involving integer programming, forms the main contribution of the paper. We discuss several ways of solving the considered MMF problems and present an extensive numerical study that illustrates the running time efficiency of the different solution approaches, and the in uence of the MCS selection options and the number of time slots on the traffic performance of a WMN.
• Application-Aware Self-Optimization of Wireless Mesh Networks with AquareYoum and DES-SERT Staehle, Barbara; Wamser, Florian; Deschner, Sebastian; Blenk, Andreas; Staehle, Dirk; Hahm, Oliver; Schmittberger, Nicolai; Günes, Mesut (2011, August).
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  @misc{info3-software-2011-9, address = {Würzburg, Germany}, author = {Staehle, Barbara and Wamser, Florian and Deschner, Sebastian and Blenk, Andreas and Staehle, Dirk and Hahm, Oliver and Schmittberger, Nicolai and Günes, Mesut}, booktitle = {EuroView2011}, keywords = {sys:hidden:software}, month = 8, title = {Application-Aware Self-Optimization of Wireless Mesh Networks with AquareYoum and DES-SERT}, year = 2011 }

  %0 Generic %1 info3-software-2011-9 %A Staehle, Barbara %A Wamser, Florian %A Deschner, Sebastian %A Blenk, Andreas %A Staehle, Dirk %A Hahm, Oliver %A Schmittberger, Nicolai %A Günes, Mesut %B EuroView2011 %C Würzburg, Germany %D 2011 %T Application-Aware Self-Optimization of Wireless Mesh Networks with AquareYoum and DES-SERT
• AquareYoum: Application and Quality of Experience-Aware Resource Management for YouTube in Wireless Mesh Networks Staehle, Barbara; Wamser, Florian; Hirth, Matthias; Stezenbach, David; Staehle, Dirk in PIK - Praxis der Informationsverarbeitung und Kommunikation (2011).
  • [ Abstract ]
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  The browser has become the users’ interface to a plethora of Internet applications which are accessible from nearly everywhere and every device. The price for the simple and cheap access over the Internet is often a reduced end-user quality of experience (QoE). The reason for this is that the network ignores the content of the packets it transports and thereby neither knows which services it supports, nor if and which quality requirements have to be given. In addition, the needs of the applications can be time varying, and the network might not be able to give strict quality guarantees. We therefore advocate the idea of an application-network interaction in order to dynamically adapt the network resources if a QoE degradation is imminent. The software suite AquareYoum implements this approach and enables a smooth YouTube video playback in a congested wireless mesh Internet access network by dynamically selecting the least congested Internet gateway.

  @article{info3-article-2011-85, abstract = {The browser has become the users’ interface to a plethora of Internet applications which are accessible from nearly everywhere and every device. The price for the simple and cheap access over the Internet is often a reduced end-user quality of experience (QoE). The reason for this is that the network ignores the content of the packets it transports and thereby neither knows which services it supports, nor if and which quality requirements have to be given. In addition, the needs of the applications can be time varying, and the network might not be able to give strict quality guarantees. We therefore advocate the idea of an application-network interaction in order to dynamically adapt the network resources if a QoE degradation is imminent. The software suite AquareYoum implements this approach and enables a smooth YouTube video playback in a congested wireless mesh Internet access network by dynamically selecting the least congested Internet gateway.}, author = {Staehle, Barbara and Wamser, Florian and Hirth, Matthias and Stezenbach, David and Staehle, Dirk}, journal = {PIK - Praxis der Informationsverarbeitung und Kommunikation}, keywords = {sys:hidden:article}, title = {AquareYoum: Application and Quality of Experience-Aware Resource Management for YouTube in Wireless Mesh Networks}, year = 2011 }

  %0 Journal Article %1 info3-article-2011-85 %A Staehle, Barbara %A Wamser, Florian %A Hirth, Matthias %A Stezenbach, David %A Staehle, Dirk %D 2011 %J PIK - Praxis der Informationsverarbeitung und Kommunikation %T AquareYoum: Application and Quality of Experience-Aware Resource Management for YouTube in Wireless Mesh Networks %X The browser has become the users’ interface to a plethora of Internet applications which are accessible from nearly everywhere and every device. The price for the simple and cheap access over the Internet is often a reduced end-user quality of experience (QoE). The reason for this is that the network ignores the content of the packets it transports and thereby neither knows which services it supports, nor if and which quality requirements have to be given. In addition, the needs of the applications can be time varying, and the network might not be able to give strict quality guarantees. We therefore advocate the idea of an application-network interaction in order to dynamically adapt the network resources if a QoE degradation is imminent. The software suite AquareYoum implements this approach and enables a smooth YouTube video playback in a congested wireless mesh Internet access network by dynamically selecting the least congested Internet gateway.

• YouTube QoE-Aware Gateway Selection in Future Wireless Networks Wamser, Florian; Staehle, Barbara; Pries, Rastin; Stezenbach, David; Deschner, Sebastian; Staehle, Dirk in EuroView2010 (2010).
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  @inproceedings{info3-inproceedings-2010-406, address = {Würzburg, Germany}, author = {Wamser, Florian and Staehle, Barbara and Pries, Rastin and Stezenbach, David and Deschner, Sebastian and Staehle, Dirk}, booktitle = {EuroView2010}, keywords = {demobenefit}, month = 8, title = {YouTube QoE-Aware Gateway Selection in Future Wireless Networks}, year = 2010 }

  %0 Conference Paper %1 info3-inproceedings-2010-406 %A Wamser, Florian %A Staehle, Barbara %A Pries, Rastin %A Stezenbach, David %A Deschner, Sebastian %A Staehle, Dirk %B EuroView2010 %C Würzburg, Germany %D 2010 %T YouTube QoE-Aware Gateway Selection in Future Wireless Networks
• On Optimization of Wireless Mesh Networks using Genetic Algorithms Pries, Rastin; Staehle, Dirk; Staehle, Barbara; Tran-Gia, Phuoc in International Journal On Advances in Internet Technology (2010). 1&2
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  @article{info3-article-2010-79, author = {Pries, Rastin and Staehle, Dirk and Staehle, Barbara and Tran-Gia, Phuoc}, journal = {International Journal On Advances in Internet Technology}, keywords = {sys:hidden:article}, month = 7, title = {On Optimization of Wireless Mesh Networks using Genetic Algorithms}, volume = {1&2}, year = 2010 }

  %0 Journal Article %1 info3-article-2010-79 %A Pries, Rastin %A Staehle, Dirk %A Staehle, Barbara %A Tran-Gia, Phuoc %D 2010 %J International Journal On Advances in Internet Technology %T On Optimization of Wireless Mesh Networks using Genetic Algorithms %V 1&2
• Effects of Link Rate Assignment in IEEE 802.11 Mesh Networks Staehle, Barbara (2010, April).
  • [ BibTeX ]
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  @presentation{info3-talk-2010-380, address = {16th European Wireless Conference, Lucca, Italy}, author = {Staehle, Barbara}, keywords = {sys:hidden:presentation}, month = 4, title = {Effects of Link Rate Assignment in IEEE 802.11 Mesh Networks}, year = 2010 }

  %0 Generic %1 info3-talk-2010-380 %A Staehle, Barbara %C 16th European Wireless Conference, Lucca, Italy %D 2010 %T Effects of Link Rate Assignment in IEEE 802.11 Mesh Networks
• Genetic Algorithms for WMN Planning Staehle, Barbara (2010, October 19).
  • [ BibTeX ]
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  @presentation{info3-talk-2010-396, address = {ACM MSWIM 2010, Bodrum, Turkey}, author = {Staehle, Barbara}, keywords = {sys:hidden:presentation}, month = 10, title = {Genetic Algorithms for WMN Planning}, year = 2010 }

  %0 Generic %1 info3-talk-2010-396 %A Staehle, Barbara %C ACM MSWIM 2010, Bodrum, Turkey %D 2010 %T Genetic Algorithms for WMN Planning
• Proposed Change to 802.11 Intra-Mesh Congestion Notification Frame Staehle, Barbara (2010, December 8).
  • [ BibTeX ]
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  @presentation{info3-talk-2010-401, address = {IEEE 802.11 TGs Ad Hoc Meeting, Munich, Germany}, author = {Staehle, Barbara}, keywords = {sys:hidden:presentation}, month = 12, title = {Proposed Change to 802.11 Intra-Mesh Congestion Notification Frame}, year = 2010 }

  %0 Generic %1 info3-talk-2010-401 %A Staehle, Barbara %C IEEE 802.11 TGs Ad Hoc Meeting, Munich, Germany %D 2010 %T Proposed Change to 802.11 Intra-Mesh Congestion Notification Frame
• Tuontu: A Tool for Evaluating the Impact of Wireless Sensor Network Design Alternatives Staehle, Barbara (2010, September 16).
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  @presentation{info3-talk-2010-398, address = {9. GI/ITG KuVS Fachgespräch Sensornetze, Würzburg, Germany}, author = {Staehle, Barbara}, keywords = {sys:hidden:presentation}, month = 9, title = {Tuontu: A Tool for Evaluating the Impact of Wireless Sensor Network Design Alternatives}, year = 2010 }

  %0 Generic %1 info3-talk-2010-398 %A Staehle, Barbara %C 9. GI/ITG KuVS Fachgespräch Sensornetze, Würzburg, Germany %D 2010 %T Tuontu: A Tool for Evaluating the Impact of Wireless Sensor Network Design Alternatives
• Improving YouTube QoE in Wireless Mesh Networks Staehle, Barbara; Hirth, Matthias; Wamser, Florian; Pries, Rastin; Staehle, Dirk (2010, June).
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  @misc{info3-poster-2010-23, author = {Staehle, Barbara and Hirth, Matthias and Wamser, Florian and Pries, Rastin and Staehle, Dirk}, booktitle = {5. Fachgespräch der GI/ITG-Fachgruppe "Kommunikation und Verteilte Systeme"}, keywords = {demobenefit}, month = 6, title = {Improving YouTube QoE in Wireless Mesh Networks}, year = 2010 }

  %0 Generic %1 info3-poster-2010-23 %A Staehle, Barbara %A Hirth, Matthias %A Wamser, Florian %A Pries, Rastin %A Staehle, Dirk %B 5. Fachgespräch der GI/ITG-Fachgruppe "Kommunikation und Verteilte Systeme" %D 2010 %T Improving YouTube QoE in Wireless Mesh Networks
• YouTube QoE-Aware Gateway Selection in Future Wireless Networks Wamser, Florian; Staehle, Barbara; Pries, Rastin; Stezenbach, David; Deschner, Sebastian; Staehle, Dirk (2010, August).
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  @misc{info3-software-2010-8, address = {Würzburg, Germany}, author = {Wamser, Florian and Staehle, Barbara and Pries, Rastin and Stezenbach, David and Deschner, Sebastian and Staehle, Dirk}, booktitle = {EuroView2010}, keywords = {sys:hidden:software}, month = 8, title = {YouTube QoE-Aware Gateway Selection in Future Wireless Networks}, year = 2010 }

  %0 Generic %1 info3-software-2010-8 %A Wamser, Florian %A Staehle, Barbara %A Pries, Rastin %A Stezenbach, David %A Deschner, Sebastian %A Staehle, Dirk %B EuroView2010 %C Würzburg, Germany %D 2010 %T YouTube QoE-Aware Gateway Selection in Future Wireless Networks
• On the Potential of IEEE 802.11s Intra-Mesh Congestion Control Staehle, Barbara (2010, October 18).
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  @presentation{info3-talk-2010-397, address = {ACM MSWIM 2010, Bodrum, Turkey}, author = {Staehle, Barbara}, keywords = {sys:hidden:presentation}, month = 10, title = {On the Potential of IEEE 802.11s Intra-Mesh Congestion Control}, year = 2010 }

  %0 Generic %1 info3-talk-2010-397 %A Staehle, Barbara %C ACM MSWIM 2010, Bodrum, Turkey %D 2010 %T On the Potential of IEEE 802.11s Intra-Mesh Congestion Control
• Optimization models for mesh networks involving max-min fairness Pióro, Michał; Staehle, Barbara; Staehle, Dirk; Yuan, Di (2010).
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  @techreport{info3-techreport-2010-255, author = {Pióro, Michał and Staehle, Barbara and Staehle, Dirk and Yuan, Di}, institution = {University of Wuerzburg}, keywords = {sys:hidden:techreport}, month = 4, title = {Optimization models for mesh networks involving max-min fairness}, year = 2010 }

  %0 Report %1 info3-techreport-2010-255 %A Pióro, Michał %A Staehle, Barbara %A Staehle, Dirk %A Yuan, Di %D 2010 %T Optimization models for mesh networks involving max-min fairness
• YoMo: A YouTube Application Comfort Monitoring Tool Staehle, Barbara; Hirth, Matthias; Pries, Rastin; Wamser, Florian; Staehle, Dirk in New Dimensions in the Assessment and Support of Quality of Experience for Multimedia Applications (2010).
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  Out of the large number of multimedia content sharing platforms YouTube is the most popular one. This is reflected by the large number of studies which focus on analyzing YouTube characteristics. Techniques for quantifying the instantaneous YouTube QoE and predicting an imminent QoE degradation have in contrast never been proposed. The latter task is even more important if network management actions shall be carried out to avoid a YouTube QoE degradation. In this work we describe YoMo, a tool which constantly monitors the YouTube application comfort. This measure quantifies the application operation condition and allows a QoE prediction. Experiments show that YoMo is able to exactly anticipate an upcoming YouTube QoE degradation.

  @inproceedings{info3-inproceedings-2010-376, abstract = {Out of the large number of multimedia content sharing platforms YouTube is the most popular one. This is reflected by the large number of studies which focus on analyzing YouTube characteristics. Techniques for quantifying the instantaneous YouTube QoE and predicting an imminent QoE degradation have in contrast never been proposed. The latter task is even more important if network management actions shall be carried out to avoid a YouTube QoE degradation. In this work we describe YoMo, a tool which constantly monitors the YouTube application comfort. This measure quantifies the application operation condition and allows a QoE prediction. Experiments show that YoMo is able to exactly anticipate an upcoming YouTube QoE degradation.}, address = {Tampere, Finland}, author = {Staehle, Barbara and Hirth, Matthias and Pries, Rastin and Wamser, Florian and Staehle, Dirk}, booktitle = {New Dimensions in the Assessment and Support of Quality of Experience for Multimedia Applications}, keywords = {demobenefit}, month = 6, title = {YoMo: A YouTube Application Comfort Monitoring Tool}, year = 2010 }

  %0 Conference Paper %1 info3-inproceedings-2010-376 %A Staehle, Barbara %A Hirth, Matthias %A Pries, Rastin %A Wamser, Florian %A Staehle, Dirk %B New Dimensions in the Assessment and Support of Quality of Experience for Multimedia Applications %C Tampere, Finland %D 2010 %T YoMo: A YouTube Application Comfort Monitoring Tool %X Out of the large number of multimedia content sharing platforms YouTube is the most popular one. This is reflected by the large number of studies which focus on analyzing YouTube characteristics. Techniques for quantifying the instantaneous YouTube QoE and predicting an imminent QoE degradation have in contrast never been proposed. The latter task is even more important if network management actions shall be carried out to avoid a YouTube QoE degradation. In this work we describe YoMo, a tool which constantly monitors the YouTube application comfort. This measure quantifies the application operation condition and allows a QoE prediction. Experiments show that YoMo is able to exactly anticipate an upcoming YouTube QoE degradation.
• Tuontu: A Tool for Evaluating the Impact of Wireless Sensor Network Design Alternatives Staehle, Barbara; Leimbach, Markus; Staehle, Dirk in 9. GI/ITG KuVS Fachgespräch Sensornetze (2010).
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  With an increasing wireless sensor network (WSN) application complexity, more alternatives for the WSN design arose. This complexity is also the reason why it is difficult to asses how and at which price in terms of money or decreased quality of service, design alternatives increase the system performance. In this work we therefore introduce a concept for quickly answering likewise questions, namely the task-based resource consumption modeling. It is the heart of the framework Tuontu which allows to easily estimate if an application is feasible in a given WSN deployment and which performance is to expect.

  @inproceedings{info3-inproceedings-2010-397, abstract = {With an increasing wireless sensor network (WSN) application complexity, more alternatives for the WSN design arose. This complexity is also the reason why it is difficult to asses how and at which price in terms of money or decreased quality of service, design alternatives increase the system performance. In this work we therefore introduce a concept for quickly answering likewise questions, namely the task-based resource consumption modeling. It is the heart of the framework Tuontu which allows to easily estimate if an application is feasible in a given WSN deployment and which performance is to expect.}, address = {Würzburg, Germany}, author = {Staehle, Barbara and Leimbach, Markus and Staehle, Dirk}, booktitle = {9. GI/ITG KuVS Fachgespräch Sensornetze}, keywords = {sys:hidden:inproceedings}, month = 9, title = {Tuontu: A Tool for Evaluating the Impact of Wireless Sensor Network Design Alternatives}, year = 2010 }

  %0 Conference Paper %1 info3-inproceedings-2010-397 %A Staehle, Barbara %A Leimbach, Markus %A Staehle, Dirk %B 9. GI/ITG KuVS Fachgespräch Sensornetze %C Würzburg, Germany %D 2010 %T Tuontu: A Tool for Evaluating the Impact of Wireless Sensor Network Design Alternatives %X With an increasing wireless sensor network (WSN) application complexity, more alternatives for the WSN design arose. This complexity is also the reason why it is difficult to asses how and at which price in terms of money or decreased quality of service, design alternatives increase the system performance. In this work we therefore introduce a concept for quickly answering likewise questions, namely the task-based resource consumption modeling. It is the heart of the framework Tuontu which allows to easily estimate if an application is feasible in a given WSN deployment and which performance is to expect.
• Max-Min Fair Throughput in Multi-Gateway Multi-Rate Mesh Networks Staehle, Dirk; Staehle, Barbara; Pries, Rastin in IEEE VTC Spring 10 (2010).
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  The problem how to determine the capacity of and achieve fairness in mesh networks is one of the key topics in practical and theoretical research on mesh networks. Max-min fairness is one way to define fairness and several algorithms how to compute max-min fair rate allocations are already published. In this paper we make two major contributions to this area of research: First, we formulate an algorithm achieving max-min fairness among end-to-end flows based on the effective load of a collision domain. This allows us to determine max-min fair rate allocations in a multi-gateway, multi-channel mesh network with equal rates for all links. Second, we extend this algorithm for heterogeneous link rates.

  @inproceedings{info3-inproceedings-2010-367, abstract = {The problem how to determine the capacity of and achieve fairness in mesh networks is one of the key topics in practical and theoretical research on mesh networks. Max-min fairness is one way to define fairness and several algorithms how to compute max-min fair rate allocations are already published. In this paper we make two major contributions to this area of research: First, we formulate an algorithm achieving max-min fairness among end-to-end flows based on the effective load of a collision domain. This allows us to determine max-min fair rate allocations in a multi-gateway, multi-channel mesh network with equal rates for all links. Second, we extend this algorithm for heterogeneous link rates.}, address = {Taipei, Taiwan}, author = {Staehle, Dirk and Staehle, Barbara and Pries, Rastin}, booktitle = {IEEE VTC Spring 10}, keywords = {sys:hidden:inproceedings}, month = 5, title = {Max-Min Fair Throughput in Multi-Gateway Multi-Rate Mesh Networks}, year = 2010 }

  %0 Conference Paper %1 info3-inproceedings-2010-367 %A Staehle, Dirk %A Staehle, Barbara %A Pries, Rastin %B IEEE VTC Spring 10 %C Taipei, Taiwan %D 2010 %T Max-Min Fair Throughput in Multi-Gateway Multi-Rate Mesh Networks %X The problem how to determine the capacity of and achieve fairness in mesh networks is one of the key topics in practical and theoretical research on mesh networks. Max-min fairness is one way to define fairness and several algorithms how to compute max-min fair rate allocations are already published. In this paper we make two major contributions to this area of research: First, we formulate an algorithm achieving max-min fairness among end-to-end flows based on the effective load of a collision domain. This allows us to determine max-min fair rate allocations in a multi-gateway, multi-channel mesh network with equal rates for all links. Second, we extend this algorithm for heterogeneous link rates.
• Effects of Link Rate Assignment in IEEE 802.11 Mesh Networks Staehle, Barbara; Staehle, Dirk; Pries, Rastin in 16th European Wireless Conference (2010).
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  The IEEE 802.11 standard supports a variety of modulation and coding schemes (MCSs). In 802.11-based wireless mesh networks (WMNs) it is hence possible to adapt the link rate to the channel conditions. In particular, smaller link rates may be accepted for an increased spatial reuse. In an earlier study, we showed that this effect is suitable for increasing the max-min fair share throughput in a WMN operating with a TDMA channel access scheme. In this work, we investigate if the use of smaller link rates is also suitable for increasing the throughput of a WMN using a contention-based channel access mechanism. For this purpose, we analytically derive a guideline for link rate assignment as protection against hidden nodes and compute the costs and benefits of this mechanism in terms of MAC layer efficiency. A simulation study shows however that in a medium sized WMN this strategy is less advantageous than assumed and allows to give advices for practical mesh network deployments.

  @inproceedings{info3-inproceedings-2010-371, abstract = {The IEEE 802.11 standard supports a variety of modulation and coding schemes (MCSs). In 802.11-based wireless mesh networks (WMNs) it is hence possible to adapt the link rate to the channel conditions. In particular, smaller link rates may be accepted for an increased spatial reuse. In an earlier study, we showed that this effect is suitable for increasing the max-min fair share throughput in a WMN operating with a TDMA channel access scheme. In this work, we investigate if the use of smaller link rates is also suitable for increasing the throughput of a WMN using a contention-based channel access mechanism. For this purpose, we analytically derive a guideline for link rate assignment as protection against hidden nodes and compute the costs and benefits of this mechanism in terms of MAC layer efficiency. A simulation study shows however that in a medium sized WMN this strategy is less advantageous than assumed and allows to give advices for practical mesh network deployments.}, address = {Lucca, Italy}, author = {Staehle, Barbara and Staehle, Dirk and Pries, Rastin}, booktitle = {16th European Wireless Conference}, keywords = {sys:hidden:inproceedings}, month = 4, title = {Effects of Link Rate Assignment in IEEE 802.11 Mesh Networks}, year = 2010 }

  %0 Conference Paper %1 info3-inproceedings-2010-371 %A Staehle, Barbara %A Staehle, Dirk %A Pries, Rastin %B 16th European Wireless Conference %C Lucca, Italy %D 2010 %T Effects of Link Rate Assignment in IEEE 802.11 Mesh Networks %X The IEEE 802.11 standard supports a variety of modulation and coding schemes (MCSs). In 802.11-based wireless mesh networks (WMNs) it is hence possible to adapt the link rate to the channel conditions. In particular, smaller link rates may be accepted for an increased spatial reuse. In an earlier study, we showed that this effect is suitable for increasing the max-min fair share throughput in a WMN operating with a TDMA channel access scheme. In this work, we investigate if the use of smaller link rates is also suitable for increasing the throughput of a WMN using a contention-based channel access mechanism. For this purpose, we analytically derive a guideline for link rate assignment as protection against hidden nodes and compute the costs and benefits of this mechanism in terms of MAC layer efficiency. A simulation study shows however that in a medium sized WMN this strategy is less advantageous than assumed and allows to give advices for practical mesh network deployments.
• Starting Up Multi-Gateway WSNs Staehle, Barbara; Staehle, Dirk in 6th International Wireless Communications and Mobile Computing Conference (2010).
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  The Internet connection of wireless sensor networks (WSNs) is in general assured by more than one gateway. Planning or optimizing such multi-gateway WSNs (MWSNs) has lately been the focus of the research community. For this purpose, most researchers assume that each sensor node knows about a path to each gateway node. The question how a MWSN can be efficiently started up, i.e. how the sensor nodes learn about the gateways has in contrast not yet been studied thoroughly. To close this gap, we formally describe the problem of starting up a MWSN and demonstrate the importance of optimizing the start-up phase by comparing the performance of an optimal solution to the performance of less efficient distributed algorithms.

  @inproceedings{info3-inproceedings-2010-372, abstract = {The Internet connection of wireless sensor networks (WSNs) is in general assured by more than one gateway. Planning or optimizing such multi-gateway WSNs (MWSNs) has lately been the focus of the research community. For this purpose, most researchers assume that each sensor node knows about a path to each gateway node. The question how a MWSN can be efficiently started up, i.e. how the sensor nodes learn about the gateways has in contrast not yet been studied thoroughly. To close this gap, we formally describe the problem of starting up a MWSN and demonstrate the importance of optimizing the start-up phase by comparing the performance of an optimal solution to the performance of less efficient distributed algorithms.}, address = {Caen, France}, author = {Staehle, Barbara and Staehle, Dirk}, booktitle = {6th International Wireless Communications and Mobile Computing Conference}, keywords = {sys:hidden:inproceedings}, month = 6, title = {Starting Up Multi-Gateway WSNs}, year = 2010 }

  %0 Conference Paper %1 info3-inproceedings-2010-372 %A Staehle, Barbara %A Staehle, Dirk %B 6th International Wireless Communications and Mobile Computing Conference %C Caen, France %D 2010 %T Starting Up Multi-Gateway WSNs %X The Internet connection of wireless sensor networks (WSNs) is in general assured by more than one gateway. Planning or optimizing such multi-gateway WSNs (MWSNs) has lately been the focus of the research community. For this purpose, most researchers assume that each sensor node knows about a path to each gateway node. The question how a MWSN can be efficiently started up, i.e. how the sensor nodes learn about the gateways has in contrast not yet been studied thoroughly. To close this gap, we formally describe the problem of starting up a MWSN and demonstrate the importance of optimizing the start-up phase by comparing the performance of an optimal solution to the performance of less efficient distributed algorithms.
• YoMo: A YouTube Application Comfort Monitoring Tool Staehle, Barbara; Hirth, Matthias; Wamser, Florian; Pries, Rastin; Staehle, Dirk (2010).
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  @techreport{info3-techreport-2010-247, author = {Staehle, Barbara and Hirth, Matthias and Wamser, Florian and Pries, Rastin and Staehle, Dirk}, institution = {University of Wuerzburg}, keywords = {sys:hidden:techreport}, month = 3, number = 467, title = {YoMo: A YouTube Application Comfort Monitoring Tool}, year = 2010 }

  %0 Report %1 info3-techreport-2010-247 %A Staehle, Barbara %A Hirth, Matthias %A Wamser, Florian %A Pries, Rastin %A Staehle, Dirk %D 2010 %N 467 %T YoMo: A YouTube Application Comfort Monitoring Tool
• QoE Prediction for Radio Resource Management Hirth, Matthias; Staehle, Barbara; Wamser, Florian; Pries, Rastin; Staehle, Dirk in The 6th International ICST Conference on Testbeds and Research Infrastructures for the Development of Networks & Communities (TridentCom 2010) (2010).
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  In this paper, we introduce a monitoring tool which measures application-specific parameters. These parameters are used to predict the QoE and to perform resource management based on QoE thresholds. We demonstrate the tool for YouTube traffic in an IEEE 802.11 mesh network. Thereby, the QoE is based on the player video buffer size and the resource management can include rerouting, throttling of best effort traffic, or a gateway handover.

  @inproceedings{info3-inproceedings-2010-384, abstract = {In this paper, we introduce a monitoring tool which measures application-specific parameters. These parameters are used to predict the QoE and to perform resource management based on QoE thresholds. We demonstrate the tool for YouTube traffic in an IEEE 802.11 mesh network. Thereby, the QoE is based on the player video buffer size and the resource management can include rerouting, throttling of best effort traffic, or a gateway handover.}, address = {Berlin, Germany}, author = {Hirth, Matthias and Staehle, Barbara and Wamser, Florian and Pries, Rastin and Staehle, Dirk}, booktitle = {The 6th International ICST Conference on Testbeds and Research Infrastructures for the Development of Networks & Communities (TridentCom 2010)}, keywords = {sys:hidden:inproceedings}, month = 5, title = {QoE Prediction for Radio Resource Management}, year = 2010 }

  %0 Conference Paper %1 info3-inproceedings-2010-384 %A Hirth, Matthias %A Staehle, Barbara %A Wamser, Florian %A Pries, Rastin %A Staehle, Dirk %B The 6th International ICST Conference on Testbeds and Research Infrastructures for the Development of Networks & Communities (TridentCom 2010) %C Berlin, Germany %D 2010 %T QoE Prediction for Radio Resource Management %X In this paper, we introduce a monitoring tool which measures application-specific parameters. These parameters are used to predict the QoE and to perform resource management based on QoE thresholds. We demonstrate the tool for YouTube traffic in an IEEE 802.11 mesh network. Thereby, the QoE is based on the player video buffer size and the resource management can include rerouting, throttling of best effort traffic, or a gateway handover.
• Improving the QoE of Citrix Thin Client Users Schlosser, Daniel; Staehle, Barbara; Binzenhöfer, Andreas; Boder, Björn in IEEE International Conference on Communications (ICC 2010) (2010).
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  During the last years so-called 'Thin Client' architectures have become very popular. Thin Clients are simple end user devices, which are provided with content and services by powerful servers. Originally this concept was developed for Local Area Networks (LANs), which provide a high Quality of Service. If they are used in Wide Area Networks (WANs) they need to be adjusted accordingly in order to guarantee a good Quality of Experience (QoE). In this paper we investigate possibilities for configuring Citrix based Thin Client architectures to improve the QoE in WAN environments. We consider the benefits on the QoE as well as the costs on network layer.

  @inproceedings{info3-inproceedings-2010-385, abstract = {During the last years so-called 'Thin Client' architectures have become very popular. Thin Clients are simple end user devices, which are provided with content and services by powerful servers. Originally this concept was developed for Local Area Networks (LANs), which provide a high Quality of Service. If they are used in Wide Area Networks (WANs) they need to be adjusted accordingly in order to guarantee a good Quality of Experience (QoE). In this paper we investigate possibilities for configuring Citrix based Thin Client architectures to improve the QoE in WAN environments. We consider the benefits on the QoE as well as the costs on network layer.}, address = {Cape Town, South Africa}, author = {Schlosser, Daniel and Staehle, Barbara and Binzenhöfer, Andreas and Boder, Björn}, booktitle = {IEEE International Conference on Communications (ICC 2010)}, keywords = {sys:hidden:inproceedings}, month = 5, title = {Improving the QoE of Citrix Thin Client Users}, year = 2010 }

  %0 Conference Paper %1 info3-inproceedings-2010-385 %A Schlosser, Daniel %A Staehle, Barbara %A Binzenhöfer, Andreas %A Boder, Björn %B IEEE International Conference on Communications (ICC 2010) %C Cape Town, South Africa %D 2010 %T Improving the QoE of Citrix Thin Client Users %X During the last years so-called 'Thin Client' architectures have become very popular. Thin Clients are simple end user devices, which are provided with content and services by powerful servers. Originally this concept was developed for Local Area Networks (LANs), which provide a high Quality of Service. If they are used in Wide Area Networks (WANs) they need to be adjusted accordingly in order to guarantee a good Quality of Experience (QoE). In this paper we investigate possibilities for configuring Citrix based Thin Client architectures to improve the QoE in WAN environments. We consider the benefits on the QoE as well as the costs on network layer.
• Genetic Algorithms for WMN Planning Pries, Rastin; Wendel, Viktor; Staehle, Barbara; Staehle, Dirk in 13-th ACM International Conference on Modeling, Analysis and Simulation of Wireless and Mobile Systems (MSWiM 2010) (2010).
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  The complex multi-hop structure of WMNs requires a careful network planning. In this paper, we investigate the usability of Genetic Algorithms (GAs) for such a planning approach. The simplicity of GAs allow us to examine a large number of network configurations in order to optimize the network throughput and to fairly distribute the resources. This is achieved with a max-min fair share throughput distribution and by evaluating node positions, routing configurations, and channel assignments. We adapt standard genetic operators and evaluate the influence of the operators on the performance. The results show that GAs are well-suited for planning WMNs.

  @inproceedings{info3-inproceedings-2010-391, abstract = {The complex multi-hop structure of WMNs requires a careful network planning. In this paper, we investigate the usability of Genetic Algorithms (GAs) for such a planning approach. The simplicity of GAs allow us to examine a large number of network configurations in order to optimize the network throughput and to fairly distribute the resources. This is achieved with a max-min fair share throughput distribution and by evaluating node positions, routing configurations, and channel assignments. We adapt standard genetic operators and evaluate the influence of the operators on the performance. The results show that GAs are well-suited for planning WMNs.}, address = {Bodrum, Turkey}, author = {Pries, Rastin and Wendel, Viktor and Staehle, Barbara and Staehle, Dirk}, booktitle = {13-th ACM International Conference on Modeling, Analysis and Simulation of Wireless and Mobile Systems (MSWiM 2010)}, keywords = {sys:hidden:inproceedings}, month = 10, title = {Genetic Algorithms for WMN Planning}, year = 2010 }

  %0 Conference Paper %1 info3-inproceedings-2010-391 %A Pries, Rastin %A Wendel, Viktor %A Staehle, Barbara %A Staehle, Dirk %B 13-th ACM International Conference on Modeling, Analysis and Simulation of Wireless and Mobile Systems (MSWiM 2010) %C Bodrum, Turkey %D 2010 %T Genetic Algorithms for WMN Planning %X The complex multi-hop structure of WMNs requires a careful network planning. In this paper, we investigate the usability of Genetic Algorithms (GAs) for such a planning approach. The simplicity of GAs allow us to examine a large number of network configurations in order to optimize the network throughput and to fairly distribute the resources. This is achieved with a max-min fair share throughput distribution and by evaluating node positions, routing configurations, and channel assignments. We adapt standard genetic operators and evaluate the influence of the operators on the performance. The results show that GAs are well-suited for planning WMNs.
• On the Potential of IEEE 802.11s Intra-Mesh Congestion Control Fu, Desheng; Staehle, Barbara; Pries, Rastin; Staehle, Dirk in 13-th ACM International Conference on Modeling, Analysis and Simulation of Wireless and Mobile Systems (MSWiM 2010) (2010).
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  IEEE 802.11s is an emerging IEEE 802.11 amendment, aiming at standardizing wireless mesh networking. As congestion is a major problem in wireless mesh networks, IEEE 802.11s addresses this problem by introducing the intra-mesh congestion control. In order to explore the potential of this mechanism, we describe two different IEEE 802.11s compliant congestion control mechanisms and discuss their respective benefits and limitations. Results from a simulative evaluation demonstrate that intra-mesh congestion control is suitable for avoiding the loss of packets which have already been forwarded over the air interface and, if appropriately implemented, increases the overall network throughput. The results do however also point out the limitations of the proposed IEEE 802.11s congestion notification format.

  @inproceedings{info3-inproceedings-2010-390, abstract = {IEEE 802.11s is an emerging IEEE 802.11 amendment, aiming at standardizing wireless mesh networking. As congestion is a major problem in wireless mesh networks, IEEE 802.11s addresses this problem by introducing the intra-mesh congestion control. In order to explore the potential of this mechanism, we describe two different IEEE 802.11s compliant congestion control mechanisms and discuss their respective benefits and limitations. Results from a simulative evaluation demonstrate that intra-mesh congestion control is suitable for avoiding the loss of packets which have already been forwarded over the air interface and, if appropriately implemented, increases the overall network throughput. The results do however also point out the limitations of the proposed IEEE 802.11s congestion notification format.}, address = {Bodrum, Turkey}, author = {Fu, Desheng and Staehle, Barbara and Pries, Rastin and Staehle, Dirk}, booktitle = {13-th ACM International Conference on Modeling, Analysis and Simulation of Wireless and Mobile Systems (MSWiM 2010)}, keywords = {sys:hidden:inproceedings}, month = 10, title = {On the Potential of IEEE 802.11s Intra-Mesh Congestion Control}, year = 2010 }

  %0 Conference Paper %1 info3-inproceedings-2010-390 %A Fu, Desheng %A Staehle, Barbara %A Pries, Rastin %A Staehle, Dirk %B 13-th ACM International Conference on Modeling, Analysis and Simulation of Wireless and Mobile Systems (MSWiM 2010) %C Bodrum, Turkey %D 2010 %T On the Potential of IEEE 802.11s Intra-Mesh Congestion Control %X IEEE 802.11s is an emerging IEEE 802.11 amendment, aiming at standardizing wireless mesh networking. As congestion is a major problem in wireless mesh networks, IEEE 802.11s addresses this problem by introducing the intra-mesh congestion control. In order to explore the potential of this mechanism, we describe two different IEEE 802.11s compliant congestion control mechanisms and discuss their respective benefits and limitations. Results from a simulative evaluation demonstrate that intra-mesh congestion control is suitable for avoiding the loss of packets which have already been forwarded over the air interface and, if appropriately implemented, increases the overall network throughput. The results do however also point out the limitations of the proposed IEEE 802.11s congestion notification format.
• Application- and Context-Aware Radio Resource Management for Future Wireless Networks Staehle, Barbara; Wamser, Florian; Pries, Rastin; Staehle, Dirk; Mannweiler, Christian; Klein, Andreas; Schneider, Jörg; Schotten, Hans D. in EuroView2010 (2010). 143–144.
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  @inproceedings{info3-inproceedings-2010-393, address = {Würzburg, Germany}, author = {Staehle, Barbara and Wamser, Florian and Pries, Rastin and Staehle, Dirk and Mannweiler, Christian and Klein, Andreas and Schneider, Jörg and Schotten, Hans D.}, booktitle = {EuroView2010}, keywords = {sys:hidden:inproceedings}, month = 8, pages = {143-144}, title = {Application- and Context-Aware Radio Resource Management for Future Wireless Networks}, year = 2010 }

  %0 Conference Paper %1 info3-inproceedings-2010-393 %A Staehle, Barbara %A Wamser, Florian %A Pries, Rastin %A Staehle, Dirk %A Mannweiler, Christian %A Klein, Andreas %A Schneider, Jörg %A Schotten, Hans D. %B EuroView2010 %C Würzburg, Germany %D 2010 %P 143-144 %T Application- and Context-Aware Radio Resource Management for Future Wireless Networks
• Starting Up Multi-Gateway WSNs Staehle, Barbara (2010, June).
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  @presentation{info3-talk-2010-381, address = {6th International Wireless Communications and Mobile Computing Conference, Caen, France}, author = {Staehle, Barbara}, keywords = {sys:hidden:presentation}, month = 6, title = {Starting Up Multi-Gateway WSNs}, year = 2010 }

  %0 Generic %1 info3-talk-2010-381 %A Staehle, Barbara %C 6th International Wireless Communications and Mobile Computing Conference, Caen, France %D 2010 %T Starting Up Multi-Gateway WSNs

• Optimizing the Association Procedure for Low-Power 802.15.4 Nonbeacon Sensor Networks Staehle, Barbara in Networking 2009 (2009).
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  Building wireless sensor networks based on the IEEE 802.15.4 standard is an interesting option, as the standard enables low-power, low data rate wireless communication. Many authors analyzed and optimized the operational phase of such networks. In contrast, the initial phase, containing the 802.15.4 association procedure, has mostly been neglected. In this paper, we therefore propose four optimization possibilities for the association procedure of a nonbeacon-enabled sensor network. Our results show that significant performance improvements in terms of association probability, speed, and energy consumptions can be achieved.

  @inproceedings{info3-inproceedings-2009-339, abstract = {Building wireless sensor networks based on the IEEE 802.15.4 standard is an interesting option, as the standard enables low-power, low data rate wireless communication. Many authors analyzed and optimized the operational phase of such networks. In contrast, the initial phase, containing the 802.15.4 association procedure, has mostly been neglected. In this paper, we therefore propose four optimization possibilities for the association procedure of a nonbeacon-enabled sensor network. Our results show that significant performance improvements in terms of association probability, speed, and energy consumptions can be achieved.}, address = {Aachen, Germany}, author = {Staehle, Barbara}, booktitle = {Networking 2009}, keywords = {sys:hidden:inproceedings}, month = 5, title = {Optimizing the Association Procedure for Low-Power 802.15.4 Nonbeacon Sensor Networks}, year = 2009 }

  %0 Conference Paper %1 info3-inproceedings-2009-339 %A Staehle, Barbara %B Networking 2009 %C Aachen, Germany %D 2009 %T Optimizing the Association Procedure for Low-Power 802.15.4 Nonbeacon Sensor Networks %X Building wireless sensor networks based on the IEEE 802.15.4 standard is an interesting option, as the standard enables low-power, low data rate wireless communication. Many authors analyzed and optimized the operational phase of such networks. In contrast, the initial phase, containing the 802.15.4 association procedure, has mostly been neglected. In this paper, we therefore propose four optimization possibilities for the association procedure of a nonbeacon-enabled sensor network. Our results show that significant performance improvements in terms of association probability, speed, and energy consumptions can be achieved.
• Wireless Mesh Network Planning and Optimization through Genetic Algorithms Pries, Rastin; Staehle, Dirk; Stoykova, Marieta; Staehle, Barbara; Tran-Gia, Phuoc in The Second International Conference on Advances in Mesh Networks, MESH 2009 (2009). 7.
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  Wireless Mesh Networks (WMNs) are a promising technology for providing broadband wireless access to the end user. They offer a higher degree of flexibility compared to traditional networks but on the expense of a more complex structure. Thus, planning and optimization of WMNs is a challenge. In this paper, we address this challenge using genetic algorithms. Genetic algorithms are able to evaluate and optimize large-scale WMNs in relatively small computation time. The results prove the effectiveness of the genetic operators to optimize the routing and channel assignment in WMNs.

  @inproceedings{info3-inproceedings-2009-347, abstract = {Wireless Mesh Networks (WMNs) are a promising technology for providing broadband wireless access to the end user. They offer a higher degree of flexibility compared to traditional networks but on the expense of a more complex structure. Thus, planning and optimization of WMNs is a challenge. In this paper, we address this challenge using genetic algorithms. Genetic algorithms are able to evaluate and optimize large-scale WMNs in relatively small computation time. The results prove the effectiveness of the genetic operators to optimize the routing and channel assignment in WMNs.}, address = {Athens/Glyfada, Greece}, author = {Pries, Rastin and Staehle, Dirk and Stoykova, Marieta and Staehle, Barbara and Tran-Gia, Phuoc}, booktitle = {The Second International Conference on Advances in Mesh Networks, MESH 2009}, keywords = {sys:hidden:inproceedings}, month = 6, pages = 7, title = {Wireless Mesh Network Planning and Optimization through Genetic Algorithms}, year = 2009 }

  %0 Conference Paper %1 info3-inproceedings-2009-347 %A Pries, Rastin %A Staehle, Dirk %A Stoykova, Marieta %A Staehle, Barbara %A Tran-Gia, Phuoc %B The Second International Conference on Advances in Mesh Networks, MESH 2009 %C Athens/Glyfada, Greece %D 2009 %P 7 %T Wireless Mesh Network Planning and Optimization through Genetic Algorithms %X Wireless Mesh Networks (WMNs) are a promising technology for providing broadband wireless access to the end user. They offer a higher degree of flexibility compared to traditional networks but on the expense of a more complex structure. Thus, planning and optimization of WMNs is a challenge. In this paper, we address this challenge using genetic algorithms. Genetic algorithms are able to evaluate and optimize large-scale WMNs in relatively small computation time. The results prove the effectiveness of the genetic operators to optimize the routing and channel assignment in WMNs.
• A Genetic Approach for Wireless Mesh Network Planning and Optimization Pries, Rastin; Staehle, Dirk; Stoykova, Marieta; Staehle, Barbara; Tran-Gia, Phuoc in IWCMC 2009 Planning and Optimization of Wireless Communication Networks (PlanNet) (2009).
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  Wireless Mesh Networks (WMNs) are gaining an increasingly important role in next generation last mile access. They offer more flexibility compared to traditional networks but on the expense of a complex structure. Thus, planning and optimization of WMNs is a challenge. In this paper we focus on routing and channel assignment in WMNs for throughput maximization using genetic algorithms. Genetic algorithms provide a good solution for large-scale WMNs in relatively small computation time. The results prove the effectiveness of the genetic operators and show the advantages of a genetic optimization. However, these operators have to be configured carefully to avoid local optima. We will show the influence of the selection principles as well as evaluation functions on the optimization.

  @inproceedings{info3-inproceedings-2009-349, abstract = {Wireless Mesh Networks (WMNs) are gaining an increasingly important role in next generation last mile access. They offer more flexibility compared to traditional networks but on the expense of a complex structure. Thus, planning and optimization of WMNs is a challenge. In this paper we focus on routing and channel assignment in WMNs for throughput maximization using genetic algorithms. Genetic algorithms provide a good solution for large-scale WMNs in relatively small computation time. The results prove the effectiveness of the genetic operators and show the advantages of a genetic optimization. However, these operators have to be configured carefully to avoid local optima. We will show the influence of the selection principles as well as evaluation functions on the optimization.}, address = {Leipzig, Germany}, author = {Pries, Rastin and Staehle, Dirk and Stoykova, Marieta and Staehle, Barbara and Tran-Gia, Phuoc}, booktitle = {IWCMC 2009 Planning and Optimization of Wireless Communication Networks (PlanNet)}, keywords = {sys:hidden:inproceedings}, month = 6, title = {A Genetic Approach for Wireless Mesh Network Planning and Optimization}, year = 2009 }

  %0 Conference Paper %1 info3-inproceedings-2009-349 %A Pries, Rastin %A Staehle, Dirk %A Stoykova, Marieta %A Staehle, Barbara %A Tran-Gia, Phuoc %B IWCMC 2009 Planning and Optimization of Wireless Communication Networks (PlanNet) %C Leipzig, Germany %D 2009 %T A Genetic Approach for Wireless Mesh Network Planning and Optimization %X Wireless Mesh Networks (WMNs) are gaining an increasingly important role in next generation last mile access. They offer more flexibility compared to traditional networks but on the expense of a complex structure. Thus, planning and optimization of WMNs is a challenge. In this paper we focus on routing and channel assignment in WMNs for throughput maximization using genetic algorithms. Genetic algorithms provide a good solution for large-scale WMNs in relatively small computation time. The results prove the effectiveness of the genetic operators and show the advantages of a genetic optimization. However, these operators have to be configured carefully to avoid local optima. We will show the influence of the selection principles as well as evaluation functions on the optimization.
• Effects of Link Rate Assignment on the Max-Min Fair Throughput of Wireless Mesh Networks Staehle, Barbara; Staehle, Dirk; Pries, Rastin in 21st International Teletraffic Congress (ITC 21) (2009).
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  Wireless mesh networks (WMNs) support a variety of modulation and coding schemes (MCSs) and hence enable adaptive modulation and coding. On the one hand, adaptive modulation and coding significantly increases the overall system capacity, as it allows to maximize the throughput on each link in dependence of the channel conditions. On the other hand, there is a trade-off between link data rate and spatial reuse, as high data rate links are less robust against interference. For maximizing the wireless mesh network performance, an intelligent link rate assignment strategy is thus required. By evaluating the maxmin fair WMN throughput under different link rate assignment strategies, we are able to show that using more robust MCSs improve the overall WMN throughput and point out directions towards an optimized MCS choice.

  @inproceedings{info3-inproceedings-2009-351, abstract = {Wireless mesh networks (WMNs) support a variety of modulation and coding schemes (MCSs) and hence enable adaptive modulation and coding. On the one hand, adaptive modulation and coding significantly increases the overall system capacity, as it allows to maximize the throughput on each link in dependence of the channel conditions. On the other hand, there is a trade-off between link data rate and spatial reuse, as high data rate links are less robust against interference. For maximizing the wireless mesh network performance, an intelligent link rate assignment strategy is thus required. By evaluating the maxmin fair WMN throughput under different link rate assignment strategies, we are able to show that using more robust MCSs improve the overall WMN throughput and point out directions towards an optimized MCS choice.}, address = {Paris, France}, author = {Staehle, Barbara and Staehle, Dirk and Pries, Rastin}, booktitle = {21st International Teletraffic Congress (ITC 21)}, keywords = {sys:hidden:inproceedings}, month = 9, title = {Effects of Link Rate Assignment on the Max-Min Fair Throughput of Wireless Mesh Networks}, year = 2009 }

  %0 Conference Paper %1 info3-inproceedings-2009-351 %A Staehle, Barbara %A Staehle, Dirk %A Pries, Rastin %B 21st International Teletraffic Congress (ITC 21) %C Paris, France %D 2009 %T Effects of Link Rate Assignment on the Max-Min Fair Throughput of Wireless Mesh Networks %X Wireless mesh networks (WMNs) support a variety of modulation and coding schemes (MCSs) and hence enable adaptive modulation and coding. On the one hand, adaptive modulation and coding significantly increases the overall system capacity, as it allows to maximize the throughput on each link in dependence of the channel conditions. On the other hand, there is a trade-off between link data rate and spatial reuse, as high data rate links are less robust against interference. For maximizing the wireless mesh network performance, an intelligent link rate assignment strategy is thus required. By evaluating the maxmin fair WMN throughput under different link rate assignment strategies, we are able to show that using more robust MCSs improve the overall WMN throughput and point out directions towards an optimized MCS choice.
• Max-Min Fair Throughput in Multi-Gateway Multi-Rate Mesh Networks Staehle, Dirk; Staehle, Barbara; Pries, Rastin (2009).
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  @techreport{info3-techreport-2009-243, author = {Staehle, Dirk and Staehle, Barbara and Pries, Rastin}, institution = {University of Wuerzburg}, keywords = {sys:hidden:techreport}, month = 1, number = 454, title = {Max-Min Fair Throughput in Multi-Gateway Multi-Rate Mesh Networks}, year = 2009 }

  %0 Report %1 info3-techreport-2009-243 %A Staehle, Dirk %A Staehle, Barbara %A Pries, Rastin %D 2009 %N 454 %T Max-Min Fair Throughput in Multi-Gateway Multi-Rate Mesh Networks
• Measuring One-Way Delay in Wireless Mesh Networks - An Experimental Investigation Staehle, Barbara; Staehle, Dirk; Pries, Rastin; Hirth, Matthias; Kassler, Andreas; Dely, Peter in 4-th ACM Workshop on Performance Monitoring and Measurement of Heterogeneous Wireless and Wired Networks (PM2HW2N 2009) (2009).
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  Wireless Mesh networks are multi-hop networks mostly based on IEEE 802.11 technology and are considered as a viable alternative for providing broadband wireless Internet access. As a consequence, they require support for Quality of Service or advanced mechanisms for selecting Internet gateways. One important required information is the one-way delay between different nodes. In this paper, we have developed, implemented, and evaluated an one-way delay estimation technique for wireless mesh networks which is based on estimating intra node queuing and inter node forwarding delay. An IP-header option field is used to accumulate the per hop delay estimate to provide an end-to-end estimate. We also outline problems with the implementation and compare results with real one-way delays obtained from a 14 node mesh testbed. We show how estimation accuracy depends on network load and provide insights into further improvements.

  @inproceedings{info3-inproceedings-2009-359, abstract = {Wireless Mesh networks are multi-hop networks mostly based on IEEE 802.11 technology and are considered as a viable alternative for providing broadband wireless Internet access. As a consequence, they require support for Quality of Service or advanced mechanisms for selecting Internet gateways. One important required information is the one-way delay between different nodes. In this paper, we have developed, implemented, and evaluated an one-way delay estimation technique for wireless mesh networks which is based on estimating intra node queuing and inter node forwarding delay. An IP-header option field is used to accumulate the per hop delay estimate to provide an end-to-end estimate. We also outline problems with the implementation and compare results with real one-way delays obtained from a 14 node mesh testbed. We show how estimation accuracy depends on network load and provide insights into further improvements.}, address = {Tenerife, Canary Islands, Spain}, author = {Staehle, Barbara and Staehle, Dirk and Pries, Rastin and Hirth, Matthias and Kassler, Andreas and Dely, Peter}, booktitle = {4-th ACM Workshop on Performance Monitoring and Measurement of Heterogeneous Wireless and Wired Networks (PM2HW2N 2009)}, keywords = {sys:hidden:inproceedings}, month = 10, title = {Measuring One-Way Delay in Wireless Mesh Networks - An Experimental Investigation}, year = 2009 }

  %0 Conference Paper %1 info3-inproceedings-2009-359 %A Staehle, Barbara %A Staehle, Dirk %A Pries, Rastin %A Hirth, Matthias %A Kassler, Andreas %A Dely, Peter %B 4-th ACM Workshop on Performance Monitoring and Measurement of Heterogeneous Wireless and Wired Networks (PM2HW2N 2009) %C Tenerife, Canary Islands, Spain %D 2009 %T Measuring One-Way Delay in Wireless Mesh Networks - An Experimental Investigation %X Wireless Mesh networks are multi-hop networks mostly based on IEEE 802.11 technology and are considered as a viable alternative for providing broadband wireless Internet access. As a consequence, they require support for Quality of Service or advanced mechanisms for selecting Internet gateways. One important required information is the one-way delay between different nodes. In this paper, we have developed, implemented, and evaluated an one-way delay estimation technique for wireless mesh networks which is based on estimating intra node queuing and inter node forwarding delay. An IP-header option field is used to accumulate the per hop delay estimate to provide an end-to-end estimate. We also outline problems with the implementation and compare results with real one-way delays obtained from a 14 node mesh testbed. We show how estimation accuracy depends on network load and provide insights into further improvements.
• Effects of Link Rate Assignment on the Max-Min Fair Throughput of Wireless Mesh Networks Staehle, Barbara (2009, September).
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  @presentation{info3-talk-2009-352, address = {21st International Teletraffic Congress (ITC 21), Paris, France}, author = {Staehle, Barbara}, keywords = {sys:hidden:presentation}, month = 9, title = {Effects of Link Rate Assignment on the Max-Min Fair Throughput of Wireless Mesh Networks}, year = 2009 }

  %0 Generic %1 info3-talk-2009-352 %A Staehle, Barbara %C 21st International Teletraffic Congress (ITC 21), Paris, France %D 2009 %T Effects of Link Rate Assignment on the Max-Min Fair Throughput of Wireless Mesh Networks
• Optimizing the Association Procedure for Low-Power 802.15.4 Nonbeacon Sensor Networks Staehle, Barbara (2009, May).
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  @presentation{info3-talk-2009-338, address = {Neworking 2009, Aachen, Germany}, author = {Staehle, Barbara}, keywords = {sys:hidden:presentation}, month = 5, title = {Optimizing the Association Procedure for Low-Power 802.15.4 Nonbeacon Sensor Networks}, year = 2009 }

  %0 Generic %1 info3-talk-2009-338 %A Staehle, Barbara %C Neworking 2009, Aachen, Germany %D 2009 %T Optimizing the Association Procedure for Low-Power 802.15.4 Nonbeacon Sensor Networks
• Monitoring YouTube Performance in Wireless Mesh Networks Wamser, Florian; Staehle, Barbara; Deschner, Sebastian; Hirth, Matthias; Staehle, Dirk; Pries, Rastin (2009, July).
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  @misc{info3-poster-2009-22, address = {Würzburg, Germany}, author = {Wamser, Florian and Staehle, Barbara and Deschner, Sebastian and Hirth, Matthias and Staehle, Dirk and Pries, Rastin}, booktitle = {EuroView2009}, keywords = {demobenefit}, month = 7, title = {Monitoring YouTube Performance in Wireless Mesh Networks}, year = 2009 }

  %0 Generic %1 info3-poster-2009-22 %A Wamser, Florian %A Staehle, Barbara %A Deschner, Sebastian %A Hirth, Matthias %A Staehle, Dirk %A Pries, Rastin %B EuroView2009 %C Würzburg, Germany %D 2009 %T Monitoring YouTube Performance in Wireless Mesh Networks
• Monitoring YouTube Performance in Wireless Mesh Networks Wamser, Florian; Staehle, Barbara; Deschner, Sebastian; Hirth, Matthias; Staehle, Dirk; Pries, Rastin (2009, July).
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  @misc{info3-software-2009-7, address = {Würzburg, Germany}, author = {Wamser, Florian and Staehle, Barbara and Deschner, Sebastian and Hirth, Matthias and Staehle, Dirk and Pries, Rastin}, booktitle = {EuroView2009}, keywords = {sys:hidden:software}, month = 7, title = {Monitoring YouTube Performance in Wireless Mesh Networks}, year = 2009 }

  %0 Generic %1 info3-software-2009-7 %A Wamser, Florian %A Staehle, Barbara %A Deschner, Sebastian %A Hirth, Matthias %A Staehle, Dirk %A Pries, Rastin %B EuroView2009 %C Würzburg, Germany %D 2009 %T Monitoring YouTube Performance in Wireless Mesh Networks
• A Genetic Approach for Wireless Mesh Network Planning and Optimization Staehle, Barbara (2009, June).
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  @presentation{info3-talk-2009-340, address = {IWCMC 2009 Planning and Optimization of Wireless Communication Networks (PlanNet), Leipzig, Germany}, author = {Staehle, Barbara}, keywords = {sys:hidden:presentation}, month = 6, title = {A Genetic Approach for Wireless Mesh Network Planning and Optimization}, year = 2009 }

  %0 Generic %1 info3-talk-2009-340 %A Staehle, Barbara %C IWCMC 2009 Planning and Optimization of Wireless Communication Networks (PlanNet), Leipzig, Germany %D 2009 %T A Genetic Approach for Wireless Mesh Network Planning and Optimization

• A Cross-Layer Approach for Enabling Low Duty Cycled ZigBee Mesh Sensor Networks Staehle, Barbara (2008, May).
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  @presentation{info3-talk-2008-272, address = {International Symposium on Wireless Pervasive Computing 2008, Santorini, Greece}, author = {Staehle, Barbara}, keywords = {sys:hidden:presentation}, month = 5, title = {A Cross-Layer Approach for Enabling Low Duty Cycled ZigBee Mesh Sensor Networks}, year = 2008 }

  %0 Generic %1 info3-talk-2008-272 %A Staehle, Barbara %C International Symposium on Wireless Pervasive Computing 2008, Santorini, Greece %D 2008 %T A Cross-Layer Approach for Enabling Low Duty Cycled ZigBee Mesh Sensor Networks
• A Closer Look at the Association Procedure in Low Power 802.15.4 Multihop Sensor Networks Staehle, Barbara in 7. GI/ITG KuVS Fachgespräch Drahtlose Sensornetze (2008).
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  IEEE 802.15.4 proposes the advantage of a standardized low power low data rate communication stack and is thereforealso an option for deploying low power wireless sensor networks (WSNs). Most studies of 802.15.4 based WSNs concentrate on the operational phase and neglected the initial startup phase. Thisb ears however also potentials for energy savings, as the 802.15.4 association procedure has to be executed to make the network operational and is not ptimized for low power networks. In this study, we point out directions how to perform the association in a self organizing and energy saving way.

  @inproceedings{info3-inproceedings-2008-328, abstract = {IEEE 802.15.4 proposes the advantage of a standardized low power low data rate communication stack and is thereforealso an option for deploying low power wireless sensor networks (WSNs). Most studies of 802.15.4 based WSNs concentrate on the operational phase and neglected the initial startup phase. Thisb ears however also potentials for energy savings, as the 802.15.4 association procedure has to be executed to make the network operational and is not ptimized for low power networks. In this study, we point out directions how to perform the association in a self organizing and energy saving way.}, address = {Berlin, Germany}, author = {Staehle, Barbara}, booktitle = {7. GI/ITG KuVS Fachgespräch Drahtlose Sensornetze}, keywords = {sys:hidden:inproceedings}, month = 9, title = {A Closer Look at the Association Procedure in Low Power 802.15.4 Multihop Sensor Networks}, year = 2008 }

  %0 Conference Paper %1 info3-inproceedings-2008-328 %A Staehle, Barbara %B 7. GI/ITG KuVS Fachgespräch Drahtlose Sensornetze %C Berlin, Germany %D 2008 %T A Closer Look at the Association Procedure in Low Power 802.15.4 Multihop Sensor Networks %X IEEE 802.15.4 proposes the advantage of a standardized low power low data rate communication stack and is thereforealso an option for deploying low power wireless sensor networks (WSNs). Most studies of 802.15.4 based WSNs concentrate on the operational phase and neglected the initial startup phase. Thisb ears however also potentials for energy savings, as the 802.15.4 association procedure has to be executed to make the network operational and is not ptimized for low power networks. In this study, we point out directions how to perform the association in a self organizing and energy saving way.
• A Cross-Layer Approach for Enabling Low Duty Cycled ZigBee Mesh Sensor Networks Staehle, Barbara; Hoßfeld, Tobias; Vicari, Norbert; Kuhnert, Matthias in International Symposium on Wireless Pervasive Computing 2008 (2008).
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  In this paper large scale multihop sensor networks are established as non-beacon enabled ZigBee mesh networks. The lifetime of the network is increased by putting nodes to sleep and to wakeup state autonomously. To enable a reliable system with sensor nodes sleeping in an asynchronous manner, we propose a cross-layer sleep scheduling solution coupled with ZigBee’s proposed AODV routing. It consists of two parts: a) Neighbor Aware Communication (NAC) and b) Adaptive Resynchronization (AR). NAC avoids sending packets to sleeping nodes while AR allows the sensor nodes to adapt their sleeping schedule to their neighbors’ duty cycles. ns-2-simulations show that the performance of such a cross-layer optimized system in terms of end-to-end delay and packet delivery ratio is comparable to the benchmark case of synchronized sleep schedules.

  @inproceedings{info3-inproceedings-2008-305, abstract = {In this paper large scale multihop sensor networks are established as non-beacon enabled ZigBee mesh networks. The lifetime of the network is increased by putting nodes to sleep and to wakeup state autonomously. To enable a reliable system with sensor nodes sleeping in an asynchronous manner, we propose a cross-layer sleep scheduling solution coupled with ZigBee’s proposed AODV routing. It consists of two parts: a) Neighbor Aware Communication (NAC) and b) Adaptive Resynchronization (AR). NAC avoids sending packets to sleeping nodes while AR allows the sensor nodes to adapt their sleeping schedule to their neighbors’ duty cycles. ns-2-simulations show that the performance of such a cross-layer optimized system in terms of end-to-end delay and packet delivery ratio is comparable to the benchmark case of synchronized sleep schedules.}, address = {Santorini, Greece}, author = {Staehle, Barbara and Hoßfeld, Tobias and Vicari, Norbert and Kuhnert, Matthias}, booktitle = {International Symposium on Wireless Pervasive Computing 2008}, keywords = {sys:hidden:inproceedings}, month = 5, title = {A Cross-Layer Approach for Enabling Low Duty Cycled ZigBee Mesh Sensor Networks}, year = 2008 }

  %0 Conference Paper %1 info3-inproceedings-2008-305 %A Staehle, Barbara %A Hoßfeld, Tobias %A Vicari, Norbert %A Kuhnert, Matthias %B International Symposium on Wireless Pervasive Computing 2008 %C Santorini, Greece %D 2008 %T A Cross-Layer Approach for Enabling Low Duty Cycled ZigBee Mesh Sensor Networks %X In this paper large scale multihop sensor networks are established as non-beacon enabled ZigBee mesh networks. The lifetime of the network is increased by putting nodes to sleep and to wakeup state autonomously. To enable a reliable system with sensor nodes sleeping in an asynchronous manner, we propose a cross-layer sleep scheduling solution coupled with ZigBee’s proposed AODV routing. It consists of two parts: a) Neighbor Aware Communication (NAC) and b) Adaptive Resynchronization (AR). NAC avoids sending packets to sleeping nodes while AR allows the sensor nodes to adapt their sleeping schedule to their neighbors’ duty cycles. ns-2-simulations show that the performance of such a cross-layer optimized system in terms of end-to-end delay and packet delivery ratio is comparable to the benchmark case of synchronized sleep schedules.
• A Closer Look at the Association Procedure in Low Power 802.15.4 Multihop Sensor Networks Staehle, Barbara (2008, September).
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  @presentation{info3-talk-2008-322, address = {7. GI/ITG KuVS Fachgespräch}, author = {Staehle, Barbara}, keywords = {sys:hidden:presentation}, month = 9, title = {A Closer Look at the Association Procedure in Low Power 802.15.4 Multihop Sensor Networks}, year = 2008 }

  %0 Generic %1 info3-talk-2008-322 %A Staehle, Barbara %C 7. GI/ITG KuVS Fachgespräch %D 2008 %T A Closer Look at the Association Procedure in Low Power 802.15.4 Multihop Sensor Networks
• Quantifying the Influence of Network Conditions on the Service Quality Experienced by a Thin Client User Staehle, Barbara; Binzenhöfer, Andreas; Schlosser, Daniel; Boder, Björn in 14. GI/ITG Konferenz Messung, Modellierung und Bewertung von Rechen- und Kommunikationssystemen (MMB 2008) (2008).
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  Quality of Experience (QoE) is a measure for the satisfaction of a user with a given service. Despite the popularity of the term, there is a lack of understanding of how to capture or quantify QoE. In this paper we therefore take a step forward in this direction using the example of thin client architectures, where the client is only used as a dumb terminal while the applications run on a central server. The satisfaction of a thin client user is thus heavily influenced by the quality of the network connection between the client and the server. We study this influence by varying different network parameters like packet loss, jitter, and delay in a controlled testbed environment. The service quality is assessed using objective measurements on application level (oQoE) and verified by means of a survey among test persons capturing subjective user satisfactions (sQoE).

  @inproceedings{info3-inproceedings-2008-303, abstract = {Quality of Experience (QoE) is a measure for the satisfaction of a user with a given service. Despite the popularity of the term, there is a lack of understanding of how to capture or quantify QoE. In this paper we therefore take a step forward in this direction using the example of thin client architectures, where the client is only used as a dumb terminal while the applications run on a central server. The satisfaction of a thin client user is thus heavily influenced by the quality of the network connection between the client and the server. We study this influence by varying different network parameters like packet loss, jitter, and delay in a controlled testbed environment. The service quality is assessed using objective measurements on application level (oQoE) and verified by means of a survey among test persons capturing subjective user satisfactions (sQoE).}, address = {Dortmund, Germany}, author = {Staehle, Barbara and Binzenhöfer, Andreas and Schlosser, Daniel and Boder, Björn}, booktitle = {14. GI/ITG Konferenz Messung, Modellierung und Bewertung von Rechen- und Kommunikationssystemen (MMB 2008)}, keywords = {sys:hidden:inproceedings}, month = 4, title = {Quantifying the Influence of Network Conditions on the Service Quality Experienced by a Thin Client User}, year = 2008 }

  %0 Conference Paper %1 info3-inproceedings-2008-303 %A Staehle, Barbara %A Binzenhöfer, Andreas %A Schlosser, Daniel %A Boder, Björn %B 14. GI/ITG Konferenz Messung, Modellierung und Bewertung von Rechen- und Kommunikationssystemen (MMB 2008) %C Dortmund, Germany %D 2008 %T Quantifying the Influence of Network Conditions on the Service Quality Experienced by a Thin Client User %X Quality of Experience (QoE) is a measure for the satisfaction of a user with a given service. Despite the popularity of the term, there is a lack of understanding of how to capture or quantify QoE. In this paper we therefore take a step forward in this direction using the example of thin client architectures, where the client is only used as a dumb terminal while the applications run on a central server. The satisfaction of a thin client user is thus heavily influenced by the quality of the network connection between the client and the server. We study this influence by varying different network parameters like packet loss, jitter, and delay in a controlled testbed environment. The service quality is assessed using objective measurements on application level (oQoE) and verified by means of a survey among test persons capturing subjective user satisfactions (sQoE).

• Impact of Energy Models on Energy Efficient Sensor Network Routing Staehle, Barbara (2007, October 1).
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  @presentation{info3-talk-2007-259, address = {10th COST 290 Management Committee Merting, Vienna, Austria}, author = {Staehle, Barbara}, keywords = {sys:hidden:presentation}, month = 10, title = {Impact of Energy Models on Energy Efficient Sensor Network Routing}, year = 2007 }

  %0 Generic %1 info3-talk-2007-259 %A Staehle, Barbara %C 10th COST 290 Management Committee Merting, Vienna, Austria %D 2007 %T Impact of Energy Models on Energy Efficient Sensor Network Routing
• Performance Comparison of Windows-based Thin-Client Architectures Schlosser, Daniel; Binzenhöfer, Andreas; Staehle, Barbara in Proc. of the Australasian Telecommunication Networks and Applications Conference 2007 (2007).
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  The basic idea behind thin-client architectures is to run applications on a central server instead of installing them separately on each client. The Windows Remote Desktop Protocol (RDP) and the Citrix Presentation Server are two well known approaches to separate the location of where the user input is processed from the computer he is actually working on. While both alternatives solve the same problem, they rely on significantly different mechanisms to handle the exchange of user input and screen updates between client and server. In this paper we therefore compare the performance of both protocols under different aspects. In particular, we study the load caused on network layer as well as the satisfaction of the end user with the service quality achieved by the different terminal services. As this performance heavily depends on the current network conditions, we emulate realistic scenarios in a controlled testbed environment and measure the time required for typical office tasks on application layer. As a result, we quantify the Quality-of-Experience (QoE) perceived by the end-user, compare the overhead required by the different available protocols, and unveil their advantages and disadvantages. Our results can be used to decide which protocol to use in which scenario.

  @inproceedings{info3-inproceedings-2007-300, abstract = {The basic idea behind thin-client architectures is to run applications on a central server instead of installing them separately on each client. The Windows Remote Desktop Protocol (RDP) and the Citrix Presentation Server are two well known approaches to separate the location of where the user input is processed from the computer he is actually working on. While both alternatives solve the same problem, they rely on significantly different mechanisms to handle the exchange of user input and screen updates between client and server. In this paper we therefore compare the performance of both protocols under different aspects. In particular, we study the load caused on network layer as well as the satisfaction of the end user with the service quality achieved by the different terminal services. As this performance heavily depends on the current network conditions, we emulate realistic scenarios in a controlled testbed environment and measure the time required for typical office tasks on application layer. As a result, we quantify the Quality-of-Experience (QoE) perceived by the end-user, compare the overhead required by the different available protocols, and unveil their advantages and disadvantages. Our results can be used to decide which protocol to use in which scenario.}, address = {Christchurch, New Zealand}, author = {Schlosser, Daniel and Binzenhöfer, Andreas and Staehle, Barbara}, booktitle = {Proc. of the Australasian Telecommunication Networks and Applications Conference 2007}, keywords = {sys:hidden:inproceedings}, month = 12, title = {Performance Comparison of Windows-based Thin-Client Architectures}, year = 2007 }

  %0 Conference Paper %1 info3-inproceedings-2007-300 %A Schlosser, Daniel %A Binzenhöfer, Andreas %A Staehle, Barbara %B Proc. of the Australasian Telecommunication Networks and Applications Conference 2007 %C Christchurch, New Zealand %D 2007 %T Performance Comparison of Windows-based Thin-Client Architectures %X The basic idea behind thin-client architectures is to run applications on a central server instead of installing them separately on each client. The Windows Remote Desktop Protocol (RDP) and the Citrix Presentation Server are two well known approaches to separate the location of where the user input is processed from the computer he is actually working on. While both alternatives solve the same problem, they rely on significantly different mechanisms to handle the exchange of user input and screen updates between client and server. In this paper we therefore compare the performance of both protocols under different aspects. In particular, we study the load caused on network layer as well as the satisfaction of the end user with the service quality achieved by the different terminal services. As this performance heavily depends on the current network conditions, we emulate realistic scenarios in a controlled testbed environment and measure the time required for typical office tasks on application layer. As a result, we quantify the Quality-of-Experience (QoE) perceived by the end-user, compare the overhead required by the different available protocols, and unveil their advantages and disadvantages. Our results can be used to decide which protocol to use in which scenario.
• Impact of Energy Models on Energy Efficient Sensor Network Routing Staehle, Barbara; Staehle, Dirk in 4th IEEE International Conference on Mobile Ad-hoc and Sensor Systems (2007).
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  Models and proposals for capturing the energy consumption of sensor nodes are plentiful. The majority of those approaches roughly agree about the energy consumed in the states of the sensor node duty cycle, but the costs of radio operations are abstracted very differently. In our work, we establish a general framework whose modular structure allows to compare existing abstractions and to investigate which factors are crucial for the modeling of transmission costs. We analyze the influence of typical assumptions on the creation of energy efficient routing topologies. For this purpose the resulting routing trees are not only compared by topological characteristics, but also by estimating radio related energy consumptions, a metric which changes strongly with the MAC layer efficiency.

  @inproceedings{info3-inproceedings-2007-288, abstract = {Models and proposals for capturing the energy consumption of sensor nodes are plentiful. The majority of those approaches roughly agree about the energy consumed in the states of the sensor node duty cycle, but the costs of radio operations are abstracted very differently. In our work, we establish a general framework whose modular structure allows to compare existing abstractions and to investigate which factors are crucial for the modeling of transmission costs. We analyze the influence of typical assumptions on the creation of energy efficient routing topologies. For this purpose the resulting routing trees are not only compared by topological characteristics, but also by estimating radio related energy consumptions, a metric which changes strongly with the MAC layer efficiency.}, address = {Pisa, Italy}, author = {Staehle, Barbara and Staehle, Dirk}, booktitle = {4th IEEE International Conference on Mobile Ad-hoc and Sensor Systems}, keywords = {sys:hidden:inproceedings}, month = 10, title = {Impact of Energy Models on Energy Efficient Sensor Network Routing}, year = 2007 }

  %0 Conference Paper %1 info3-inproceedings-2007-288 %A Staehle, Barbara %A Staehle, Dirk %B 4th IEEE International Conference on Mobile Ad-hoc and Sensor Systems %C Pisa, Italy %D 2007 %T Impact of Energy Models on Energy Efficient Sensor Network Routing %X Models and proposals for capturing the energy consumption of sensor nodes are plentiful. The majority of those approaches roughly agree about the energy consumed in the states of the sensor node duty cycle, but the costs of radio operations are abstracted very differently. In our work, we establish a general framework whose modular structure allows to compare existing abstractions and to investigate which factors are crucial for the modeling of transmission costs. We analyze the influence of typical assumptions on the creation of energy efficient routing topologies. For this purpose the resulting routing trees are not only compared by topological characteristics, but also by estimating radio related energy consumptions, a metric which changes strongly with the MAC layer efficiency.
• Enabling the Sleep Mode in Non-beaconed 802.15.4 Multihop Networks - A Simulative Investigation Staehle, Barbara; Hoßfeld, Tobias; Kuhnert, Matthias; Vicari, Norbert in 6. GI/ITG KuVS Fachgespräch Drahtlose Sensornetze (2007).
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  Large wireless sensor network deployments used for environ- mental monitoring or cargo tracking, require energy efficient mesh topologies. This implies duty cycling of sensor nodes to be coordinated with the routing protocol. Staying in the context of ZigBee, we simulate the combination of the sleep enabled non-beaconed mode of 802.15.4 and AODV routing and compare the duty cycling effects of synchronized and unsynchronized sleep scheduling. We consider two different link layer feedback schemes for AODV, denoted as regular and smooth AODV.

  @inproceedings{info3-inproceedings-2007-286, abstract = {Large wireless sensor network deployments used for environ- mental monitoring or cargo tracking, require energy efficient mesh topologies. This implies duty cycling of sensor nodes to be coordinated with the routing protocol. Staying in the context of ZigBee, we simulate the combination of the sleep enabled non-beaconed mode of 802.15.4 and AODV routing and compare the duty cycling effects of synchronized and unsynchronized sleep scheduling. We consider two different link layer feedback schemes for AODV, denoted as regular and smooth AODV.}, address = {Aachen, Germany}, author = {Staehle, Barbara and Hoßfeld, Tobias and Kuhnert, Matthias and Vicari, Norbert}, booktitle = {6. GI/ITG KuVS Fachgespräch Drahtlose Sensornetze}, keywords = {sys:hidden:inproceedings}, month = 7, title = {Enabling the Sleep Mode in Non-beaconed 802.15.4 Multihop Networks - A Simulative Investigation}, year = 2007 }

  %0 Conference Paper %1 info3-inproceedings-2007-286 %A Staehle, Barbara %A Hoßfeld, Tobias %A Kuhnert, Matthias %A Vicari, Norbert %B 6. GI/ITG KuVS Fachgespräch Drahtlose Sensornetze %C Aachen, Germany %D 2007 %T Enabling the Sleep Mode in Non-beaconed 802.15.4 Multihop Networks - A Simulative Investigation %X Large wireless sensor network deployments used for environ- mental monitoring or cargo tracking, require energy efficient mesh topologies. This implies duty cycling of sensor nodes to be coordinated with the routing protocol. Staying in the context of ZigBee, we simulate the combination of the sleep enabled non-beaconed mode of 802.15.4 and AODV routing and compare the duty cycling effects of synchronized and unsynchronized sleep scheduling. We consider two different link layer feedback schemes for AODV, denoted as regular and smooth AODV.
• Enabling the Sleep Mode in Non-beaconed 802.15.4 Multihop Networks - A Simulative Investigation Staehle, Barbara (2007, July 17).
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  @presentation{info3-talk-2007-253, address = {RWTH Aachen, Germany}, author = {Staehle, Barbara}, keywords = {sys:hidden:presentation}, month = 7, title = {Enabling the Sleep Mode in Non-beaconed 802.15.4 Multihop Networks - A Simulative Investigation}, year = 2007 }

  %0 Generic %1 info3-talk-2007-253 %A Staehle, Barbara %C RWTH Aachen, Germany %D 2007 %T Enabling the Sleep Mode in Non-beaconed 802.15.4 Multihop Networks - A Simulative Investigation
• Source Traffic Characterization for Thin Client Based Office Applications Staehle, Barbara (2007).
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  @presentation{info3-talk-2007-251, address = {University of Twente, Enschede, The Netherlands}, author = {Staehle, Barbara}, keywords = {sys:hidden:presentation}, title = {Source Traffic Characterization for Thin Client Based Office Applications}, year = 2007 }

  %0 Generic %1 info3-talk-2007-251 %A Staehle, Barbara %C University of Twente, Enschede, The Netherlands %D 2007 %T Source Traffic Characterization for Thin Client Based Office Applications
• Impact of Energy Models on Energy Efficient Sensor Network Routing Staehle, Barbara (2007, October 9).
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  @presentation{info3-talk-2007-260, address = {MASS 2007, Pisa, Italy}, author = {Staehle, Barbara}, keywords = {sys:hidden:presentation}, month = 10, title = {Impact of Energy Models on Energy Efficient Sensor Network Routing}, year = 2007 }

  %0 Generic %1 info3-talk-2007-260 %A Staehle, Barbara %C MASS 2007, Pisa, Italy %D 2007 %T Impact of Energy Models on Energy Efficient Sensor Network Routing