Prof. Dr. rer. nat. Kenji Leibnitz

• Modeling of Modern Router Architectures Supporting Network Virtualization. Hoßfeld, Tobias; Leibnitz, Kenji; Nakao, Akihiro. In 2nd International Workshop on the Network of the Future (FutureNet II) in conjunction with IEEE GLOBECOM 2009. Honolulu, Hawaii, 2009.
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  For the emerging concept of network virtualization where a multitude of virtual networks (VNs) coexist, the main challenge is to isolate and control the resources allocated for individual virtual networks. Realizing such resource allocation requires deliberate design of the router enhanced specifically for handling a large number of virtual network flows. This paper discusses fundamental challenges on modeling the architecture of modern routers for the support of the virtual networks. Our intention is to discuss strategies for scheduling the traffic on each isolated VN and to provide an elementary framework for evaluating the performance of the router extended to classify incoming VN traffic. Furthermore, we also present simulation results and discuss challenges and future directions encountered in the implementation and deployment of VNs.

  @inproceedings{info3-inproceedings-2009-362, abstract = {For the emerging concept of network virtualization where a multitude of virtual networks (VNs) coexist, the main challenge is to isolate and control the resources allocated for individual virtual networks. Realizing such resource allocation requires deliberate design of the router enhanced specifically for handling a large number of virtual network flows. This paper discusses fundamental challenges on modeling the architecture of modern routers for the support of the virtual networks. Our intention is to discuss strategies for scheduling the traffic on each isolated VN and to provide an elementary framework for evaluating the performance of the router extended to classify incoming VN traffic. Furthermore, we also present simulation results and discuss challenges and future directions encountered in the implementation and deployment of VNs.}, address = {Honolulu, Hawaii}, author = {Hoßfeld, Tobias and Leibnitz, Kenji and Nakao, Akihiro}, booktitle = {2nd International Workshop on the Network of the Future (FutureNet II) in conjunction with IEEE GLOBECOM 2009}, keywords = {sys:hidden:inproceedings}, month = 12, title = {Modeling of Modern Router Architectures Supporting Network Virtualization}, year = 2009 }

  %0 Conference Paper %1 info3-inproceedings-2009-362 %A Hoßfeld, Tobias %A Leibnitz, Kenji %A Nakao, Akihiro %B 2nd International Workshop on the Network of the Future (FutureNet II) in conjunction with IEEE GLOBECOM 2009 %C Honolulu, Hawaii %D 2009 %T Modeling of Modern Router Architectures Supporting Network Virtualization %X For the emerging concept of network virtualization where a multitude of virtual networks (VNs) coexist, the main challenge is to isolate and control the resources allocated for individual virtual networks. Realizing such resource allocation requires deliberate design of the router enhanced specifically for handling a large number of virtual network flows. This paper discusses fundamental challenges on modeling the architecture of modern routers for the support of the virtual networks. Our intention is to discuss strategies for scheduling the traffic on each isolated VN and to provide an elementary framework for evaluating the performance of the router extended to classify incoming VN traffic. Furthermore, we also present simulation results and discuss challenges and future directions encountered in the implementation and deployment of VNs.

• A Qualitative Measurement Survey of Popular Internet-based IPTV Systems. Hoßfeld, Tobias; Leibnitz, Kenji. In Second International Conference on Communications and Electronics (HUT-ICCE 2008). Hoi An, Vietnam, 2008.
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  Television has traditionally been an entirely broadcastoriented medium. However, nowadays, new technologies delivering packetized digital video data are on the brink of replacing conventional television broadcasts via terrestrial, satellite or cable transmissions. With increasing access bandwidth speeds for end users, the new Internet-based television (IPTV) has gained popularity as a means of delivering high-quality video images. One of its main features is its high degree of interactivity. Users are no longer restricted to the broadcast schedules of TV stations, but can choose the program they wish to see on-demand, whenever, wherever, and on whatever device they want (TV, PC, portable player). Additionally, further value-added services are often included, such as chat functions or other feedback mechanisms allowing the viewers to provide ratings or discussion forums on the shows. The technological advancement in high-speed Internet accesses facilitates such possibilities. Meanwhile, a large coverage of DSL or fiber-to-the-home (FTTH) is available and improved video encoders like H.264 permit the transmission of clear high-resolution video images at half the bitrate of MPEG2 current on DVDs. In addition, offering IPTV has now also become an attractive business model for telecommunication service providers. Many providers no longer limit their offer just on telephone or Internet access, but provide so-called triple play services, integrating Internet, voice-over-IP (VoIP) telephone services, as well as television or movie channels. Furthermore, it is also appealing to businesses, which can offer personalized advertisements, individually tuned to the TV programs the customer is currently watching or localized to his region of access. However, one problem in IPTV is that content is licensed differently in different regions and therefore some IPTV solutions, e.g. Zattoo (Europe) or Gyao (Japan), limit their access only to IP addresses from those regions. In this paper we characterize some of the popular existing IPTV solutions by describing their architectures and characterizing their traffic through measurements. We focus on the applications Zattoo, Joost, YouTube, PPLive and OTR, and point out their differences in system architecture and technology. Especially in the case of proprietary systems, measurements at the edge of the network are the only feasible way to evaluate the Quality of Service/Experience (QoS/QoE) of an arbitrary user. Nevertheless, it allows us to identify the used protocols and constructed overlay topologies.

  @inproceedings{info3-inproceedings-2008-314, abstract = {Television has traditionally been an entirely broadcastoriented medium. However, nowadays, new technologies delivering packetized digital video data are on the brink of replacing conventional television broadcasts via terrestrial, satellite or cable transmissions. With increasing access bandwidth speeds for end users, the new Internet-based television (IPTV) has gained popularity as a means of delivering high-quality video images. One of its main features is its high degree of interactivity. Users are no longer restricted to the broadcast schedules of TV stations, but can choose the program they wish to see on-demand, whenever, wherever, and on whatever device they want (TV, PC, portable player). Additionally, further value-added services are often included, such as chat functions or other feedback mechanisms allowing the viewers to provide ratings or discussion forums on the shows. The technological advancement in high-speed Internet accesses facilitates such possibilities. Meanwhile, a large coverage of DSL or fiber-to-the-home (FTTH) is available and improved video encoders like H.264 permit the transmission of clear high-resolution video images at half the bitrate of MPEG2 current on DVDs. In addition, offering IPTV has now also become an attractive business model for telecommunication service providers. Many providers no longer limit their offer just on telephone or Internet access, but provide so-called triple play services, integrating Internet, voice-over-IP (VoIP) telephone services, as well as television or movie channels. Furthermore, it is also appealing to businesses, which can offer personalized advertisements, individually tuned to the TV programs the customer is currently watching or localized to his region of access. However, one problem in IPTV is that content is licensed differently in different regions and therefore some IPTV solutions, e.g. Zattoo (Europe) or Gyao (Japan), limit their access only to IP addresses from those regions. In this paper we characterize some of the popular existing IPTV solutions by describing their architectures and characterizing their traffic through measurements. We focus on the applications Zattoo, Joost, YouTube, PPLive and OTR, and point out their differences in system architecture and technology. Especially in the case of proprietary systems, measurements at the edge of the network are the only feasible way to evaluate the Quality of Service/Experience (QoS/QoE) of an arbitrary user. Nevertheless, it allows us to identify the used protocols and constructed overlay topologies.}, address = {Hoi An, Vietnam}, author = {Hoßfeld, Tobias and Leibnitz, Kenji}, booktitle = {Second International Conference on Communications and Electronics (HUT-ICCE 2008)}, keywords = {sys:hidden:inproceedings}, month = {06}, title = {A Qualitative Measurement Survey of Popular Internet-based IPTV Systems}, year = 2008 }

  %0 Conference Paper %1 info3-inproceedings-2008-314 %A Hoßfeld, Tobias %A Leibnitz, Kenji %B Second International Conference on Communications and Electronics (HUT-ICCE 2008) %C Hoi An, Vietnam %D 2008 %T A Qualitative Measurement Survey of Popular Internet-based IPTV Systems %X Television has traditionally been an entirely broadcastoriented medium. However, nowadays, new technologies delivering packetized digital video data are on the brink of replacing conventional television broadcasts via terrestrial, satellite or cable transmissions. With increasing access bandwidth speeds for end users, the new Internet-based television (IPTV) has gained popularity as a means of delivering high-quality video images. One of its main features is its high degree of interactivity. Users are no longer restricted to the broadcast schedules of TV stations, but can choose the program they wish to see on-demand, whenever, wherever, and on whatever device they want (TV, PC, portable player). Additionally, further value-added services are often included, such as chat functions or other feedback mechanisms allowing the viewers to provide ratings or discussion forums on the shows. The technological advancement in high-speed Internet accesses facilitates such possibilities. Meanwhile, a large coverage of DSL or fiber-to-the-home (FTTH) is available and improved video encoders like H.264 permit the transmission of clear high-resolution video images at half the bitrate of MPEG2 current on DVDs. In addition, offering IPTV has now also become an attractive business model for telecommunication service providers. Many providers no longer limit their offer just on telephone or Internet access, but provide so-called triple play services, integrating Internet, voice-over-IP (VoIP) telephone services, as well as television or movie channels. Furthermore, it is also appealing to businesses, which can offer personalized advertisements, individually tuned to the TV programs the customer is currently watching or localized to his region of access. However, one problem in IPTV is that content is licensed differently in different regions and therefore some IPTV solutions, e.g. Zattoo (Europe) or Gyao (Japan), limit their access only to IP addresses from those regions. In this paper we characterize some of the popular existing IPTV solutions by describing their architectures and characterizing their traffic through measurements. We focus on the applications Zattoo, Joost, YouTube, PPLive and OTR, and point out their differences in system architecture and technology. Especially in the case of proprietary systems, measurements at the edge of the network are the only feasible way to evaluate the Quality of Service/Experience (QoS/QoE) of an arbitrary user. Nevertheless, it allows us to identify the used protocols and constructed overlay topologies.
• Performance Modeling of Data Aggregation in Wireless Sensor Networks. Hoßfeld, Tobias; Leibnitz, Kenji. In Invited Paper at the Jointly-organized Symposium of the Institute of Intelligent Information and Communications Technology (IICT) at Konan University and the ORSJ (Operations Research Society of Japan). Kobe, Japan, 2008.
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  @inproceedings{info3-inproceedings-2008-334, address = {Kobe, Japan}, author = {Hoßfeld, Tobias and Leibnitz, Kenji}, booktitle = {Invited Paper at the Jointly-organized Symposium of the Institute of Intelligent Information and Communications Technology (IICT) at Konan University and the ORSJ (Operations Research Society of Japan)}, keywords = {sys:hidden:inproceedings}, month = 12, title = {Performance Modeling of Data Aggregation in Wireless Sensor Networks}, year = 2008 }

  %0 Conference Paper %1 info3-inproceedings-2008-334 %A Hoßfeld, Tobias %A Leibnitz, Kenji %B Invited Paper at the Jointly-organized Symposium of the Institute of Intelligent Information and Communications Technology (IICT) at Konan University and the ORSJ (Operations Research Society of Japan) %C Kobe, Japan %D 2008 %T Performance Modeling of Data Aggregation in Wireless Sensor Networks
• Exact Sojourn Time Distribution in an Online IPTV Recording Service. Hoßfeld, Tobias; Leibnitz, Kenji; Remiche, Marie-Ange. In 15th International Conference on Analytical and Stochastic Modelling Techniques and Applications (ASMTA 2008). Nicosia, Cyprus, 2008.
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  In this paper we analytically derive the sojourn time of a user accessing an online IPTV recording service. Basically, the system consists of a server (or server farm) and the bandwidth at which a user can download recorded files depends on the number of other concurrently downloading users. In particular, we consider both cases, one in which the user’s download speed is limited by his own access bandwidth, whereas in the other case the server is the bottleneck and all downloading users share the server’s upload capacity. Our model includes user impatience which depends on the actual download speed. A user may abort his download attempt if a threshold duration is exceeded. The file size distribution is obtained by measurements of offered files at an existing server.

  @inproceedings{info3-inproceedings-2008-315, abstract = {In this paper we analytically derive the sojourn time of a user accessing an online IPTV recording service. Basically, the system consists of a server (or server farm) and the bandwidth at which a user can download recorded files depends on the number of other concurrently downloading users. In particular, we consider both cases, one in which the user’s download speed is limited by his own access bandwidth, whereas in the other case the server is the bottleneck and all downloading users share the server’s upload capacity. Our model includes user impatience which depends on the actual download speed. A user may abort his download attempt if a threshold duration is exceeded. The file size distribution is obtained by measurements of offered files at an existing server.}, address = {Nicosia, Cyprus}, author = {Hoßfeld, Tobias and Leibnitz, Kenji and Remiche, Marie-Ange}, booktitle = {15th International Conference on Analytical and Stochastic Modelling Techniques and Applications (ASMTA 2008)}, keywords = {sys:hidden:inproceedings}, month = {06}, title = {Exact Sojourn Time Distribution in an Online IPTV Recording Service}, year = 2008 }

  %0 Conference Paper %1 info3-inproceedings-2008-315 %A Hoßfeld, Tobias %A Leibnitz, Kenji %A Remiche, Marie-Ange %B 15th International Conference on Analytical and Stochastic Modelling Techniques and Applications (ASMTA 2008) %C Nicosia, Cyprus %D 2008 %T Exact Sojourn Time Distribution in an Online IPTV Recording Service %X In this paper we analytically derive the sojourn time of a user accessing an online IPTV recording service. Basically, the system consists of a server (or server farm) and the bandwidth at which a user can download recorded files depends on the number of other concurrently downloading users. In particular, we consider both cases, one in which the user’s download speed is limited by his own access bandwidth, whereas in the other case the server is the bottleneck and all downloading users share the server’s upload capacity. Our model includes user impatience which depends on the actual download speed. A user may abort his download attempt if a threshold duration is exceeded. The file size distribution is obtained by measurements of offered files at an existing server.

• Estimating Churn in Structured P2P Networks. Technical Report (404), . Binzenhöfer, Andreas; Leibnitz, Kenji. University of Wuerzburg, 2007.
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  @techreport{info3-techreport-2007-203, author = {Binzenhöfer, Andreas and Leibnitz, Kenji}, institution = {University of Wuerzburg}, keywords = {sys:hidden:techreport}, month = {04}, number = 404, title = {Estimating Churn in Structured P2P Networks}, year = 2007 }

  %0 Report %1 info3-techreport-2007-203 %A Binzenhöfer, Andreas %A Leibnitz, Kenji %D 2007 %N 404 %T Estimating Churn in Structured P2P Networks
• Performance Evaluation of an IPTV Recording Service. Hoßfeld, Tobias; Leibnitz, Kenji. In Invited Paper at the Jointly-organized Symposium of the Institute of Intelligent Information and Communications Technology (IICT) at Konan University and the ORSJ (Operations Research Society of Japan). Kobe, Japan, 2007.
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  @inproceedings{info3-inproceedings-2007-301, address = {Kobe, Japan}, author = {Hoßfeld, Tobias and Leibnitz, Kenji}, booktitle = {Invited Paper at the Jointly-organized Symposium of the Institute of Intelligent Information and Communications Technology (IICT) at Konan University and the ORSJ (Operations Research Society of Japan)}, keywords = {sys:hidden:inproceedings}, month = 12, title = {Performance Evaluation of an IPTV Recording Service}, year = 2007 }

  %0 Conference Paper %1 info3-inproceedings-2007-301 %A Hoßfeld, Tobias %A Leibnitz, Kenji %B Invited Paper at the Jointly-organized Symposium of the Institute of Intelligent Information and Communications Technology (IICT) at Konan University and the ORSJ (Operations Research Society of Japan) %C Kobe, Japan %D 2007 %T Performance Evaluation of an IPTV Recording Service
• Source Traffic Modeling of Wireless Applications. Tran-Gia, Phuoc; Staehle, Dirk; Leibnitz, Kenji. In International Journal of Electronics and Communications, 55. 2007.
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  @article{info3-article-2001-9, author = {Tran-Gia, Phuoc and Staehle, Dirk and Leibnitz, Kenji}, journal = {International Journal of Electronics and Communications}, keywords = {sys:hidden:article}, title = {Source Traffic Modeling of Wireless Applications}, volume = 55, year = 2007 }

  %0 Journal Article %1 info3-article-2001-9 %A Tran-Gia, Phuoc %A Staehle, Dirk %A Leibnitz, Kenji %D 2007 %J International Journal of Electronics and Communications %T Source Traffic Modeling of Wireless Applications %V 55
• QoS of Internet Access with GPRS. Staehle, Dirk; Leibnitz, Kenji; Tsipotis, Konstantin. In Wireless Networks, 9, pp. 213–222. 2007.
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  @article{info3-article-2003-12, author = {Staehle, Dirk and Leibnitz, Kenji and Tsipotis, Konstantin}, journal = {Wireless Networks}, keywords = {sys:hidden:article}, pages = {213–222}, title = {QoS of Internet Access with GPRS}, volume = 9, year = 2007 }

  %0 Journal Article %1 info3-article-2003-12 %A Staehle, Dirk %A Leibnitz, Kenji %A Tsipotis, Konstantin %D 2007 %J Wireless Networks %P 213--222 %T QoS of Internet Access with GPRS %V 9
• Teletraffic Issues in Mobile Communication Network Planning. Leibnitz, Kenji; Tran-Gia, Phuoc; Tutschku, Kurt. In Telecommunication Systems, 15. 2007.
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  @article{info3-article-2000-10, author = {Leibnitz, Kenji and Tran-Gia, Phuoc and Tutschku, Kurt}, journal = {Telecommunication Systems}, keywords = {sys:hidden:article}, title = {Teletraffic Issues in Mobile Communication Network Planning}, volume = 15, year = 2007 }

  %0 Journal Article %1 info3-article-2000-10 %A Leibnitz, Kenji %A Tran-Gia, Phuoc %A Tutschku, Kurt %D 2007 %J Telecommunication Systems %T Teletraffic Issues in Mobile Communication Network Planning %V 15
• Peer-to-Peer vs. Client/Server: Reliability and Efficiency of a Content Distribution Service. Technical Report (422), . Leibnitz, Kenji; Hoßfeld, Tobias; Wakamiya, Naoki; Murata, Masayuki. University of Wuerzburg, 2007.
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  @techreport{info3-techreport-2007-218, author = {Leibnitz, Kenji and Hoßfeld, Tobias and Wakamiya, Naoki and Murata, Masayuki}, institution = {University of Wuerzburg}, keywords = {sys:hidden:techreport}, month = {05}, number = 422, title = {Peer-to-Peer vs. Client/Server: Reliability and Efficiency of a Content Distribution Service}, year = 2007 }

  %0 Report %1 info3-techreport-2007-218 %A Leibnitz, Kenji %A Hoßfeld, Tobias %A Wakamiya, Naoki %A Murata, Masayuki %D 2007 %N 422 %T Peer-to-Peer vs. Client/Server: Reliability and Efficiency of a Content Distribution Service
• Peer-to-Peer vs. Client/Server: Reliability and Efficiency of a Content Distribution Service. Leibnitz, Kenji; Hoßfeld, Tobias; Wakamiya, Naoki; Murata, Masayuki. In 20th International Teletraffic Congress (ITC20). Ottawa, Canada, 2007.
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  In this paper we evaluate the performance of a content distribution service with respect to reliability and efficiency. The considered technology for realizing such a service can either be a traditional client/server (CS) architecture or a peer-to-peer (P2P) network. In CS, the capacity of the server is the bottleneck and has to be dimensioned in such a way that all requests can be accommodated at any time, while a P2P system does not burden a single server since the content is distributed in the network among sharing peers. However, corrupted or fake files may diminish the reliability of the P2P service due to downloading of useless contents. We compare a CS system to P2P and evaluate the downloading time, success ratio, and fairness while considering flash crowd arrivals and corrupted contents.

  @inproceedings{info3-inproceedings-2007-265, abstract = {In this paper we evaluate the performance of a content distribution service with respect to reliability and efficiency. The considered technology for realizing such a service can either be a traditional client/server (CS) architecture or a peer-to-peer (P2P) network. In CS, the capacity of the server is the bottleneck and has to be dimensioned in such a way that all requests can be accommodated at any time, while a P2P system does not burden a single server since the content is distributed in the network among sharing peers. However, corrupted or fake files may diminish the reliability of the P2P service due to downloading of useless contents. We compare a CS system to P2P and evaluate the downloading time, success ratio, and fairness while considering flash crowd arrivals and corrupted contents.}, address = {Ottawa, Canada}, author = {Leibnitz, Kenji and Hoßfeld, Tobias and Wakamiya, Naoki and Murata, Masayuki}, booktitle = {20th International Teletraffic Congress (ITC20)}, keywords = {sys:hidden:inproceedings}, month = {06}, title = {Peer-to-Peer vs. Client/Server: Reliability and Efficiency of a Content Distribution Service}, year = 2007 }

  %0 Conference Paper %1 info3-inproceedings-2007-265 %A Leibnitz, Kenji %A Hoßfeld, Tobias %A Wakamiya, Naoki %A Murata, Masayuki %B 20th International Teletraffic Congress (ITC20) %C Ottawa, Canada %D 2007 %T Peer-to-Peer vs. Client/Server: Reliability and Efficiency of a Content Distribution Service %X In this paper we evaluate the performance of a content distribution service with respect to reliability and efficiency. The considered technology for realizing such a service can either be a traditional client/server (CS) architecture or a peer-to-peer (P2P) network. In CS, the capacity of the server is the bottleneck and has to be dimensioned in such a way that all requests can be accommodated at any time, while a P2P system does not burden a single server since the content is distributed in the network among sharing peers. However, corrupted or fake files may diminish the reliability of the P2P service due to downloading of useless contents. We compare a CS system to P2P and evaluate the downloading time, success ratio, and fairness while considering flash crowd arrivals and corrupted contents.
• Modeling and Evaluation of an Online TV Recording Service. Hoßfeld, Tobias; Leibnitz, Kenji. In Ninth annual workshop on mathematical performance modeling and analysis MAMA2007, in conjunction with ACM SIGMETRICS ’07 and FCRC ’07. San Diego, CA, USA, 2007.
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  Recently, new services have emerged which utilize the Internet as a delivery mechanism for multimedia content. With the advent of broadband accesses, more users are willing to download large volume content from servers, such as video files of TV shows. While some popular video services (e.g. YouTube.com) or some broadcasting companies (e.g. ABC.com) use streaming data with Flash technology, some media distributors (e.g. iTunes) offer entire TV shows for download. In this study, we investigate the performance of the German site OnlineTVRecorder.com (OTR), which acts as an online video cassette recorder (VCR) where users can program their favorite shows over a web interface and download the recorded files from a server or its mirrors. These files are offered in different formats and can consist of several hundred megabytes up to 1GB or more depending on the length of the TV show as well as the encoding format. OTR can, thus, be seen as an example for a server-based content distribution system with large data files. However, as these server farms are often overloaded, new requests are queued when the provided download slots are full. The restriction to a maximum number of simultaneous downloads guarantees a minimal download bandwidth for each user. Additionally, the service offers premium users prioritized access to downloading. The download duration itself depends on the total capacity of the server and the number of users sharing this capacity. On the other hand, users who might encounter slow downloads may abort their downloading attempt if their patience is exceeded. In this paper, we discuss the impact of the user’s impatience on the performance of such an OTR server with different file size distributions. The paper is organized as follows. After describing the problem and formulating simple analytical models, we provide numerical results and compare their performance in terms of download duration and success ratio. Especially, we address the question of how to properly dimension the number of simultaneous downloads at a server in order to optimize the performance of the system and to maximize the user’s satisfaction.

  @inproceedings{info3-inproceedings-2007-283, abstract = {Recently, new services have emerged which utilize the Internet as a delivery mechanism for multimedia content. With the advent of broadband accesses, more users are willing to download large volume content from servers, such as video files of TV shows. While some popular video services (e.g. YouTube.com) or some broadcasting companies (e.g. ABC.com) use streaming data with Flash technology, some media distributors (e.g. iTunes) offer entire TV shows for download. In this study, we investigate the performance of the German site OnlineTVRecorder.com (OTR), which acts as an online video cassette recorder (VCR) where users can program their favorite shows over a web interface and download the recorded files from a server or its mirrors. These files are offered in different formats and can consist of several hundred megabytes up to 1GB or more depending on the length of the TV show as well as the encoding format. OTR can, thus, be seen as an example for a server-based content distribution system with large data files. However, as these server farms are often overloaded, new requests are queued when the provided download slots are full. The restriction to a maximum number of simultaneous downloads guarantees a minimal download bandwidth for each user. Additionally, the service offers premium users prioritized access to downloading. The download duration itself depends on the total capacity of the server and the number of users sharing this capacity. On the other hand, users who might encounter slow downloads may abort their downloading attempt if their patience is exceeded. In this paper, we discuss the impact of the user’s impatience on the performance of such an OTR server with different file size distributions. The paper is organized as follows. After describing the problem and formulating simple analytical models, we provide numerical results and compare their performance in terms of download duration and success ratio. Especially, we address the question of how to properly dimension the number of simultaneous downloads at a server in order to optimize the performance of the system and to maximize the user’s satisfaction.}, address = {San Diego, CA, USA}, author = {Hoßfeld, Tobias and Leibnitz, Kenji}, booktitle = {Ninth annual workshop on mathematical performance modeling and analysis MAMA2007, in conjunction with ACM SIGMETRICS '07 and FCRC '07}, keywords = {sys:hidden:inproceedings}, month = {06}, title = {Modeling and Evaluation of an Online TV Recording Service}, year = 2007 }

  %0 Conference Paper %1 info3-inproceedings-2007-283 %A Hoßfeld, Tobias %A Leibnitz, Kenji %B Ninth annual workshop on mathematical performance modeling and analysis MAMA2007, in conjunction with ACM SIGMETRICS '07 and FCRC '07 %C San Diego, CA, USA %D 2007 %T Modeling and Evaluation of an Online TV Recording Service %X Recently, new services have emerged which utilize the Internet as a delivery mechanism for multimedia content. With the advent of broadband accesses, more users are willing to download large volume content from servers, such as video files of TV shows. While some popular video services (e.g. YouTube.com) or some broadcasting companies (e.g. ABC.com) use streaming data with Flash technology, some media distributors (e.g. iTunes) offer entire TV shows for download. In this study, we investigate the performance of the German site OnlineTVRecorder.com (OTR), which acts as an online video cassette recorder (VCR) where users can program their favorite shows over a web interface and download the recorded files from a server or its mirrors. These files are offered in different formats and can consist of several hundred megabytes up to 1GB or more depending on the length of the TV show as well as the encoding format. OTR can, thus, be seen as an example for a server-based content distribution system with large data files. However, as these server farms are often overloaded, new requests are queued when the provided download slots are full. The restriction to a maximum number of simultaneous downloads guarantees a minimal download bandwidth for each user. Additionally, the service offers premium users prioritized access to downloading. The download duration itself depends on the total capacity of the server and the number of users sharing this capacity. On the other hand, users who might encounter slow downloads may abort their downloading attempt if their patience is exceeded. In this paper, we discuss the impact of the user’s impatience on the performance of such an OTR server with different file size distributions. The paper is organized as follows. After describing the problem and formulating simple analytical models, we provide numerical results and compare their performance in terms of download duration and success ratio. Especially, we address the question of how to properly dimension the number of simultaneous downloads at a server in order to optimize the performance of the system and to maximize the user’s satisfaction.
• Estimating Churn in Structured P2P Networks. Binzenhöfer, Andreas; Leibnitz, Kenji. In 20th International Teletraffic Congress (ITC20). Ottawa, Canada, 2007.
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  @inproceedings{info3-inproceedings-2007-261, address = {Ottawa, Canada}, author = {Binzenhöfer, Andreas and Leibnitz, Kenji}, booktitle = {20th International Teletraffic Congress (ITC20)}, keywords = {sys:hidden:inproceedings}, month = {06}, title = {Estimating Churn in Structured P2P Networks}, year = 2007 }

  %0 Conference Paper %1 info3-inproceedings-2007-261 %A Binzenhöfer, Andreas %A Leibnitz, Kenji %B 20th International Teletraffic Congress (ITC20) %C Ottawa, Canada %D 2007 %T Estimating Churn in Structured P2P Networks
• Modeling of an Online TV Recording System. Hoßfeld, Tobias; Leibnitz, Kenji; Remiche, Marie-Ange. In SIGMETRICS Performance Evaluation Review, Volume 35, Number 2. 2007.
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  Recently, new services have emerged which utilize the Internet as a delivery mechanism for multimedia content. With the advent of broadband accesses, more users are willing to download large volume content from servers, such as video files of TV shows. While some popular video services (e.g. YouTube.com) or some broadcasting companies (e.g. ABC.com) use streaming data with Flash technology, some media distributors (e.g. iTunes) offer entire TV shows for download. In this study, we investigate the performance of the German site OnlineTVRecorder.com (OTR), which acts as an online video cassette recorder (VCR) where users can program their favorite shows over a web interface and download the recorded files from a server or its mirrors. These files are offered in different file formats and can consist of several hundred megabytes up to 1GB or more depending on the length of the TV show as well as the encoding format. OTR can, thus, be seen as an example for a server-based content distribution system with large data files. However, as these server farms are often overloaded, new requests are queued when the provided download slots are full. The restriction to a maximum number of simultaneous downloads guarantees a minimal download bandwidth for each user. Additionally, the service offers premium users prioritized access to downloading. The download duration itself depends on the total capacity of the server and the number of users currently sharing this capacity. On the other hand, users who might encounter slow downloads may abort their downloading attempt if their patience is exceeded. In this paper, we discuss analytical modeling approaches which consider the impact of the user’s impatience on the performance of an OTR server with different file size distributions. The paper is organized as follows. After describing the problem and related work, we formulate simple analytical models and compare their performance in terms of download duration and success ratio. Especially, we address the question of how to properly dimension the number of simultaneous downloads at a server in order to optimize the performance of the system and to maximize the user satisfaction.

  @article{info3-article-2007-49, abstract = {Recently, new services have emerged which utilize the Internet as a delivery mechanism for multimedia content. With the advent of broadband accesses, more users are willing to download large volume content from servers, such as video files of TV shows. While some popular video services (e.g. YouTube.com) or some broadcasting companies (e.g. ABC.com) use streaming data with Flash technology, some media distributors (e.g. iTunes) offer entire TV shows for download. In this study, we investigate the performance of the German site OnlineTVRecorder.com (OTR), which acts as an online video cassette recorder (VCR) where users can program their favorite shows over a web interface and download the recorded files from a server or its mirrors. These files are offered in different file formats and can consist of several hundred megabytes up to 1GB or more depending on the length of the TV show as well as the encoding format. OTR can, thus, be seen as an example for a server-based content distribution system with large data files. However, as these server farms are often overloaded, new requests are queued when the provided download slots are full. The restriction to a maximum number of simultaneous downloads guarantees a minimal download bandwidth for each user. Additionally, the service offers premium users prioritized access to downloading. The download duration itself depends on the total capacity of the server and the number of users currently sharing this capacity. On the other hand, users who might encounter slow downloads may abort their downloading attempt if their patience is exceeded. In this paper, we discuss analytical modeling approaches which consider the impact of the user’s impatience on the performance of an OTR server with different file size distributions. The paper is organized as follows. After describing the problem and related work, we formulate simple analytical models and compare their performance in terms of download duration and success ratio. Especially, we address the question of how to properly dimension the number of simultaneous downloads at a server in order to optimize the performance of the system and to maximize the user satisfaction.}, author = {Hoßfeld, Tobias and Leibnitz, Kenji and Remiche, Marie-Ange}, journal = {SIGMETRICS Performance Evaluation Review}, keywords = {sys:hidden:article}, month = {09}, title = {Modeling of an Online TV Recording System}, volume = {Volume 35, Number 2}, year = 2007 }

  %0 Journal Article %1 info3-article-2007-49 %A Hoßfeld, Tobias %A Leibnitz, Kenji %A Remiche, Marie-Ange %D 2007 %J SIGMETRICS Performance Evaluation Review %T Modeling of an Online TV Recording System %V Volume 35, Number 2 %X Recently, new services have emerged which utilize the Internet as a delivery mechanism for multimedia content. With the advent of broadband accesses, more users are willing to download large volume content from servers, such as video files of TV shows. While some popular video services (e.g. YouTube.com) or some broadcasting companies (e.g. ABC.com) use streaming data with Flash technology, some media distributors (e.g. iTunes) offer entire TV shows for download. In this study, we investigate the performance of the German site OnlineTVRecorder.com (OTR), which acts as an online video cassette recorder (VCR) where users can program their favorite shows over a web interface and download the recorded files from a server or its mirrors. These files are offered in different file formats and can consist of several hundred megabytes up to 1GB or more depending on the length of the TV show as well as the encoding format. OTR can, thus, be seen as an example for a server-based content distribution system with large data files. However, as these server farms are often overloaded, new requests are queued when the provided download slots are full. The restriction to a maximum number of simultaneous downloads guarantees a minimal download bandwidth for each user. Additionally, the service offers premium users prioritized access to downloading. The download duration itself depends on the total capacity of the server and the number of users currently sharing this capacity. On the other hand, users who might encounter slow downloads may abort their downloading attempt if their patience is exceeded. In this paper, we discuss analytical modeling approaches which consider the impact of the user’s impatience on the performance of an OTR server with different file size distributions. The paper is organized as follows. After describing the problem and related work, we formulate simple analytical models and compare their performance in terms of download duration and success ratio. Especially, we address the question of how to properly dimension the number of simultaneous downloads at a server in order to optimize the performance of the system and to maximize the user satisfaction.

• Modeling of Epidemic Diffusion in Peer-to-Peer File-Sharing Networks. Leibnitz, Kenji; Hoßfeld, Tobias; Wakamiya, Naoki; Murata, Masayuki. In The Second International Workshop on Biologically Inspired Approaches to Advanced Information Technology, Bio-ADIT 2006, LNCS 3853. Senri Life Science Center, Osaka, Japan, 2006.
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  In this paper we propose an analytical model for file diffusion in a peer-to-peer (P2P) file-sharing network based on biological epidemics. During the downloading process, the peer shares the downloaded parts of the file and, thus, contributes to distributing it in the network. This behavior is similar to the spreading of epidemic diseases which is a well researched subject in mathematical biology. Unlike other P2P models based on epidemics, we show that steady state assumptions are not sufficient and that the granularity of the diffusion model may be appropriately selected.

  @inproceedings{info3-inproceedings-2006-204, abstract = {In this paper we propose an analytical model for file diffusion in a peer-to-peer (P2P) file-sharing network based on biological epidemics. During the downloading process, the peer shares the downloaded parts of the file and, thus, contributes to distributing it in the network. This behavior is similar to the spreading of epidemic diseases which is a well researched subject in mathematical biology. Unlike other P2P models based on epidemics, we show that steady state assumptions are not sufficient and that the granularity of the diffusion model may be appropriately selected.}, address = {Senri Life Science Center, Osaka, Japan}, author = {Leibnitz, Kenji and Hoßfeld, Tobias and Wakamiya, Naoki and Murata, Masayuki}, booktitle = {The Second International Workshop on Biologically Inspired Approaches to Advanced Information Technology, Bio-ADIT 2006, LNCS 3853}, keywords = {p2pfdai}, month = {01}, title = {Modeling of Epidemic Diffusion in Peer-to-Peer File-Sharing Networks}, year = 2006 }

  %0 Conference Paper %1 info3-inproceedings-2006-204 %A Leibnitz, Kenji %A Hoßfeld, Tobias %A Wakamiya, Naoki %A Murata, Masayuki %B The Second International Workshop on Biologically Inspired Approaches to Advanced Information Technology, Bio-ADIT 2006, LNCS 3853 %C Senri Life Science Center, Osaka, Japan %D 2006 %T Modeling of Epidemic Diffusion in Peer-to-Peer File-Sharing Networks %X In this paper we propose an analytical model for file diffusion in a peer-to-peer (P2P) file-sharing network based on biological epidemics. During the downloading process, the peer shares the downloaded parts of the file and, thus, contributes to distributing it in the network. This behavior is similar to the spreading of epidemic diseases which is a well researched subject in mathematical biology. Unlike other P2P models based on epidemics, we show that steady state assumptions are not sufficient and that the granularity of the diffusion model may be appropriately selected.
• On Pollution in eDonkey-like Peer-to-Peer File-Sharing Networks. Leibnitz, Kenji; Hoßfeld, Tobias; Wakamiya, Naoki; Murata, Masayuki. In 13th GI/ITG Conference on Measurement, Modeling, and Evaluation of Computer and Communication Systems, MMB2006. Nürnberg, Germany, 2006.
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  In this paper we propose an analytical model for file diffusion in a peer-to-peer (P2P) file-sharing network based on biological epidemics. During the downloading process, the peer shares the downloaded parts of the file and, thus, contributes to distributing it in the network. This behavior is similar to the spreading of epidemic diseases which is a well researched subject in mathematical biology. With our model we investigate the dynamics of file diffusion focusing on the effects of pollution, e.g. malicious peers sharing corrupted version of the file.

  @inproceedings{info3-inproceedings-2006-207, abstract = {In this paper we propose an analytical model for file diffusion in a peer-to-peer (P2P) file-sharing network based on biological epidemics. During the downloading process, the peer shares the downloaded parts of the file and, thus, contributes to distributing it in the network. This behavior is similar to the spreading of epidemic diseases which is a well researched subject in mathematical biology. With our model we investigate the dynamics of file diffusion focusing on the effects of pollution, e.g. malicious peers sharing corrupted version of the file.}, address = {Nürnberg, Germany}, author = {Leibnitz, Kenji and Hoßfeld, Tobias and Wakamiya, Naoki and Murata, Masayuki}, booktitle = {13th GI/ITG Conference on Measurement, Modeling, and Evaluation of Computer and Communication Systems, MMB2006}, keywords = {p2pfdai}, month = {03}, title = {On Pollution in eDonkey-like Peer-to-Peer File-Sharing Networks}, year = 2006 }

  %0 Conference Paper %1 info3-inproceedings-2006-207 %A Leibnitz, Kenji %A Hoßfeld, Tobias %A Wakamiya, Naoki %A Murata, Masayuki %B 13th GI/ITG Conference on Measurement, Modeling, and Evaluation of Computer and Communication Systems, MMB2006 %C Nürnberg, Germany %D 2006 %T On Pollution in eDonkey-like Peer-to-Peer File-Sharing Networks %X In this paper we propose an analytical model for file diffusion in a peer-to-peer (P2P) file-sharing network based on biological epidemics. During the downloading process, the peer shares the downloaded parts of the file and, thus, contributes to distributing it in the network. This behavior is similar to the spreading of epidemic diseases which is a well researched subject in mathematical biology. With our model we investigate the dynamics of file diffusion focusing on the effects of pollution, e.g. malicious peers sharing corrupted version of the file.

• Impact of Interferers on the Epidemic Diffusion in Peer-to-Peer File-Sharing Networks. Technical Report (366), . Leibnitz, Kenji; Hoßfeld, Tobias; Wakamiya, Naoki; Murata, Masayuki. University of Wuerzburg, 2005.
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  @techreport{info3-techreport-2005-184, author = {Leibnitz, Kenji and Hoßfeld, Tobias and Wakamiya, Naoki and Murata, Masayuki}, institution = {University of Wuerzburg}, keywords = {sys:hidden:techreport}, month = {08}, number = 366, title = {Impact of Interferers on the Epidemic Diffusion in Peer-to-Peer File-Sharing Networks}, year = 2005 }

  %0 Report %1 info3-techreport-2005-184 %A Leibnitz, Kenji %A Hoßfeld, Tobias %A Wakamiya, Naoki %A Murata, Masayuki %D 2005 %N 366 %T Impact of Interferers on the Epidemic Diffusion in Peer-to-Peer File-Sharing Networks

• Information Diffusion in eDonkey Filesharing Networks. Hoßfeld, Tobias; Leibnitz, Kenji; Pries, Rastin; Tutschku, Kurt; Tran-Gia, Phuoc; Pawlikowski, Krzysztof. In ATNAC 2004, p. 8. Sydney, Australia, 2004.
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  Peer-to-Peer (P2P) applications have become highly popular in today’s Internet due to the spread of file sharing platforms such as KaZaa, eDonkey, and BitTorrent. In this paper we investigate the diffusion behavior of a file shared by multiple sources in an eDonkey-like peer-to-peer (P2P) environment. We provide two simulation models, one which captures the chunk transfer in a detailed way and a simplified model, where the upload bandwidth is equally split among all chunks of the file. The simulation of a single chunk transmission is sufficient to obtain accurate results, which leads to a much shorter simulation time. We further investigate the non-stationary process of file diffusion in a statistically reliable way. Depending on the popularity of the file, we consider flash crowd arrivals and constant arrivals. We derive simple analytical expressions showing the relationship between the propagation of the file, i.e. the number of peers sharing the chunk, and the main influencing factors: e.g. sharing probability, access probability, or arrival rate.

  @inproceedings{info3-inproceedings-2004-150, abstract = {Peer-to-Peer (P2P) applications have become highly popular in today’s Internet due to the spread of file sharing platforms such as KaZaa, eDonkey, and BitTorrent. In this paper we investigate the diffusion behavior of a file shared by multiple sources in an eDonkey-like peer-to-peer (P2P) environment. We provide two simulation models, one which captures the chunk transfer in a detailed way and a simplified model, where the upload bandwidth is equally split among all chunks of the file. The simulation of a single chunk transmission is sufficient to obtain accurate results, which leads to a much shorter simulation time. We further investigate the non-stationary process of file diffusion in a statistically reliable way. Depending on the popularity of the file, we consider flash crowd arrivals and constant arrivals. We derive simple analytical expressions showing the relationship between the propagation of the file, i.e. the number of peers sharing the chunk, and the main influencing factors: e.g. sharing probability, access probability, or arrival rate.}, address = {Sydney, Australia}, author = {Hoßfeld, Tobias and Leibnitz, Kenji and Pries, Rastin and Tutschku, Kurt and Tran-Gia, Phuoc and Pawlikowski, Krzysztof}, booktitle = {ATNAC 2004}, keywords = {p2pfdai}, month = 12, pages = 8, title = {Information Diffusion in eDonkey Filesharing Networks}, year = 2004 }

  %0 Conference Paper %1 info3-inproceedings-2004-150 %A Hoßfeld, Tobias %A Leibnitz, Kenji %A Pries, Rastin %A Tutschku, Kurt %A Tran-Gia, Phuoc %A Pawlikowski, Krzysztof %B ATNAC 2004 %C Sydney, Australia %D 2004 %P 8 %T Information Diffusion in eDonkey Filesharing Networks %X Peer-to-Peer (P2P) applications have become highly popular in today’s Internet due to the spread of file sharing platforms such as KaZaa, eDonkey, and BitTorrent. In this paper we investigate the diffusion behavior of a file shared by multiple sources in an eDonkey-like peer-to-peer (P2P) environment. We provide two simulation models, one which captures the chunk transfer in a detailed way and a simplified model, where the upload bandwidth is equally split among all chunks of the file. The simulation of a single chunk transmission is sufficient to obtain accurate results, which leads to a much shorter simulation time. We further investigate the non-stationary process of file diffusion in a statistically reliable way. Depending on the popularity of the file, we consider flash crowd arrivals and constant arrivals. We derive simple analytical expressions showing the relationship between the propagation of the file, i.e. the number of peers sharing the chunk, and the main influencing factors: e.g. sharing probability, access probability, or arrival rate.
• Information Diffusion in eDonkey Filesharing Networks. Technical Report (341), . Hoßfeld, Tobias; Leibnitz, Kenji; Pries, Rastin; Tutschku, Kurt; Tran-Gia, Phuoc; Pawlikowski, Krzysztof. University of Wuerzburg, 2004.
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  @techreport{info3-techreport-2004-163, author = {Hoßfeld, Tobias and Leibnitz, Kenji and Pries, Rastin and Tutschku, Kurt and Tran-Gia, Phuoc and Pawlikowski, Krzysztof}, institution = {University of Wuerzburg}, keywords = {sys:hidden:techreport}, month = {09}, number = 341, title = {Information Diffusion in eDonkey Filesharing Networks}, year = 2004 }

  %0 Report %1 info3-techreport-2004-163 %A Hoßfeld, Tobias %A Leibnitz, Kenji %A Pries, Rastin %A Tutschku, Kurt %A Tran-Gia, Phuoc %A Pawlikowski, Krzysztof %D 2004 %N 341 %T Information Diffusion in eDonkey Filesharing Networks
• T-Mobile UMTS. Leibnitz, Kenji; Staehle, Dirk; Heck, Klaus; Mäder, Andreas. 2004.
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  @misc{info3-poster-2004-4, author = {Leibnitz, Kenji and Staehle, Dirk and Heck, Klaus and Mäder, Andreas}, booktitle = {T-Mobile}, keywords = {sys:hidden:poster}, title = {T-Mobile UMTS}, year = 2004 }

  %0 Generic %1 info3-poster-2004-4 %A Leibnitz, Kenji %A Staehle, Dirk %A Heck, Klaus %A Mäder, Andreas %B T-Mobile %D 2004 %T T-Mobile UMTS

• Macro Diversity Gain in UMTS Networks with Clustered User Distributions. Staehle, Dirk; Heck, Klaus; Leibnitz, Kenji. In International Teletraffic Congress (ITC-18). Berlin, Germany, 2003.
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  @inproceedings{info3-inproceedings-2003-57, address = {Berlin, Germany}, author = {Staehle, Dirk and Heck, Klaus and Leibnitz, Kenji}, booktitle = {International Teletraffic Congress (ITC-18)}, keywords = {sys:hidden:inproceedings}, month = {08}, title = {Macro Diversity Gain in UMTS Networks with Clustered User Distributions}, year = 2003 }

  %0 Conference Paper %1 info3-inproceedings-2003-57 %A Staehle, Dirk %A Heck, Klaus %A Leibnitz, Kenji %B International Teletraffic Congress (ITC-18) %C Berlin, Germany %D 2003 %T Macro Diversity Gain in UMTS Networks with Clustered User Distributions
• Analytic Approximation of the Effective Bandwidth for Best-Effort Services in UMTS Networks. Leibnitz, Kenji; Staehle, Dirk; Tran-Gia, Phuoc; Heck, Klaus; Schröder, Bernd; Weller, Albert. In Proc. of IEEE Vehicular Technology Conference (VTC-03 Spring). Jeju, South Korea, 2003.
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  @inproceedings{info3-inproceedings-2003-58, address = {Jeju, South Korea}, author = {Leibnitz, Kenji and Staehle, Dirk and Tran-Gia, Phuoc and Heck, Klaus and Schröder, Bernd and Weller, Albert}, booktitle = {Proc. of IEEE Vehicular Technology Conference (VTC-03 Spring)}, keywords = {sys:hidden:inproceedings}, month = {04}, title = {Analytic Approximation of the Effective Bandwidth for Best-Effort Services in UMTS Networks}, year = 2003 }

  %0 Conference Paper %1 info3-inproceedings-2003-58 %A Leibnitz, Kenji %A Staehle, Dirk %A Tran-Gia, Phuoc %A Heck, Klaus %A Schröder, Bernd %A Weller, Albert %B Proc. of IEEE Vehicular Technology Conference (VTC-03 Spring) %C Jeju, South Korea %D 2003 %T Analytic Approximation of the Effective Bandwidth for Best-Effort Services in UMTS Networks
• Analytical Modeling of Power Control and its Impact on Wideband CDMA Capacity and Planning. Technical Report (PhD dissertation), . Leibnitz, Kenji. PhD dissertation. University of Wuerzburg, 2003, February.
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  @phdthesis{info3-dissertation-2003-8, author = {Leibnitz, Kenji}, keywords = {sys:hidden:supervisor:phuoc.tran-gia}, month = {02}, school = {University of Wuerzburg}, title = {Analytical Modeling of Power Control and its Impact on Wideband CDMA Capacity and Planning}, year = 2003 }

  %0 Thesis %1 info3-dissertation-2003-8 %A Leibnitz, Kenji %D 2003 %T Analytical Modeling of Power Control and its Impact on Wideband CDMA Capacity and Planning

• Approximating the Othercell Interference Distribution in Inhomogeneous UMTS Networks. Weller, Albert; Heck, Klaus; Schröder, Bernd; Staehle, Dirk; Tran-Gia, Phuoc; Leibnitz, Kenji. In Proc. of the IEEE Vehicular Technology Conference (VTC-02 Spring). Birmingham, AL, 2002.
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  @inproceedings{info3-inproceedings-2002-43, address = {Birmingham, AL}, author = {Weller, Albert and Heck, Klaus and Schröder, Bernd and Staehle, Dirk and Tran-Gia, Phuoc and Leibnitz, Kenji}, booktitle = {Proc. of the IEEE Vehicular Technology Conference (VTC-02 Spring)}, keywords = {sys:hidden:inproceedings}, month = {05}, title = {Approximating the Othercell Interference Distribution in Inhomogeneous UMTS Networks}, year = 2002 }

  %0 Conference Paper %1 info3-inproceedings-2002-43 %A Weller, Albert %A Heck, Klaus %A Schröder, Bernd %A Staehle, Dirk %A Tran-Gia, Phuoc %A Leibnitz, Kenji %B Proc. of the IEEE Vehicular Technology Conference (VTC-02 Spring) %C Birmingham, AL %D 2002 %T Approximating the Othercell Interference Distribution in Inhomogeneous UMTS Networks
• An Approximation of Othercell Interference Distributions for UMTS Systems using Fixed-Point Equations. Technical Report (292), . Weller, Albert; Leibnitz, Kenji; Heck, Klaus; Tran-Gia, Phuoc; Schröder, Bernd; Staehle, Dirk. University of Wuerzburg, 2002.
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  @techreport{info3-techreport-2002-46, author = {Weller, Albert and Leibnitz, Kenji and Heck, Klaus and Tran-Gia, Phuoc and Schröder, Bernd and Staehle, Dirk}, institution = {University of Wuerzburg}, keywords = {sys:hidden:techreport}, month = {01}, number = 292, title = {An Approximation of Othercell Interference Distributions for UMTS Systems using Fixed-Point Equations}, year = 2002 }

  %0 Report %1 info3-techreport-2002-46 %A Weller, Albert %A Leibnitz, Kenji %A Heck, Klaus %A Tran-Gia, Phuoc %A Schröder, Bernd %A Staehle, Dirk %D 2002 %N 292 %T An Approximation of Othercell Interference Distributions for UMTS Systems using Fixed-Point Equations
• Diversity Effects on the Soft Handover Gain in UMTS networks. Technical Report (295), . Leibnitz, Kenji; Staehle, Dirk; Heck, Klaus. University of Wuerzburg, 2002.
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  @techreport{info3-techreport-2002-47, author = {Leibnitz, Kenji and Staehle, Dirk and Heck, Klaus}, institution = {University of Wuerzburg}, keywords = {sys:hidden:techreport}, month = {04}, number = 295, title = {Diversity Effects on the Soft Handover Gain in UMTS networks}, year = 2002 }

  %0 Report %1 info3-techreport-2002-47 %A Leibnitz, Kenji %A Staehle, Dirk %A Heck, Klaus %D 2002 %N 295 %T Diversity Effects on the Soft Handover Gain in UMTS networks
• Diversity Effects on the Soft Handover Gain in UMTS networks. Staehle, Dirk; Leibnitz, Kenji; Heck, Klaus. In Proc. of IEEE Vehicular Technology Conference (VTC-02 Fall). Vancouver, Canada, 2002.
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  @inproceedings{info3-inproceedings-2002-45, address = {Vancouver, Canada}, author = {Staehle, Dirk and Leibnitz, Kenji and Heck, Klaus}, booktitle = {Proc. of IEEE Vehicular Technology Conference (VTC-02 Fall)}, keywords = {sys:hidden:inproceedings}, month = {09}, title = {Diversity Effects on the Soft Handover Gain in UMTS networks}, year = 2002 }

  %0 Conference Paper %1 info3-inproceedings-2002-45 %A Staehle, Dirk %A Leibnitz, Kenji %A Heck, Klaus %B Proc. of IEEE Vehicular Technology Conference (VTC-02 Fall) %C Vancouver, Canada %D 2002 %T Diversity Effects on the Soft Handover Gain in UMTS networks
• Effects of Soft Handover on the UMTS Downlink Performance. Staehle, Dirk; Leibnitz, Kenji; Heck, Klaus. In Proc. of IEEE Vehicular Technology Conference (VTC-02 Fall). Vancouver, Canada, 2002.
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  @inproceedings{info3-inproceedings-2002-44, address = {Vancouver, Canada}, author = {Staehle, Dirk and Leibnitz, Kenji and Heck, Klaus}, booktitle = {Proc. of IEEE Vehicular Technology Conference (VTC-02 Fall)}, keywords = {sys:hidden:inproceedings}, month = {09}, title = {Effects of Soft Handover on the UMTS Downlink Performance}, year = 2002 }

  %0 Conference Paper %1 info3-inproceedings-2002-44 %A Staehle, Dirk %A Leibnitz, Kenji %A Heck, Klaus %B Proc. of IEEE Vehicular Technology Conference (VTC-02 Fall) %C Vancouver, Canada %D 2002 %T Effects of Soft Handover on the UMTS Downlink Performance
• Fast Prediction of the Coverage Area in UMTS Networks. Leibnitz, Kenji; Heck, Klaus; Staehle, Dirk. In Proc. of IEEE GLOBECOM. Taipei, Taiwan, 2002.
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  @inproceedings{info3-inproceedings-2002-46, address = {Taipei, Taiwan}, author = {Leibnitz, Kenji and Heck, Klaus and Staehle, Dirk}, booktitle = {Proc. of IEEE GLOBECOM}, keywords = {sys:hidden:inproceedings}, month = 11, title = {Fast Prediction of the Coverage Area in UMTS Networks}, year = 2002 }

  %0 Conference Paper %1 info3-inproceedings-2002-46 %A Leibnitz, Kenji %A Heck, Klaus %A Staehle, Dirk %B Proc. of IEEE GLOBECOM %C Taipei, Taiwan %D 2002 %T Fast Prediction of the Coverage Area in UMTS Networks

• Performance Evaluation of Interference and Cell Loading in a UMTS Network. Krauß, Armin; Leibnitz, Kenji. In Proc. of the 17th International Teletraffic Congress (ITC-17). Salvador de Bahia, Brazil, 2001.
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  @inproceedings{info3-inproceedings-2001-40, address = {Salvador de Bahia, Brazil}, author = {Krauß, Armin and Leibnitz, Kenji}, booktitle = {Proc. of the 17th International Teletraffic Congress (ITC-17)}, keywords = {sys:hidden:inproceedings}, month = 12, title = {Performance Evaluation of Interference and Cell Loading in a UMTS Network}, year = 2001 }

  %0 Conference Paper %1 info3-inproceedings-2001-40 %A Krauß, Armin %A Leibnitz, Kenji %B Proc. of the 17th International Teletraffic Congress (ITC-17) %C Salvador de Bahia, Brazil %D 2001 %T Performance Evaluation of Interference and Cell Loading in a UMTS Network
• QoS of Internet Access with GPRS. Technical Report (283), . Leibnitz, Kenji; Staehle, Dirk; Tsipotis, Konstantin. University of Wuerzburg, 2001.
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  @techreport{info3-techreport-2001-44, author = {Leibnitz, Kenji and Staehle, Dirk and Tsipotis, Konstantin}, institution = {University of Wuerzburg}, keywords = {sys:hidden:techreport}, month = 10, number = 283, title = {QoS of Internet Access with GPRS}, year = 2001 }

  %0 Report %1 info3-techreport-2001-44 %A Leibnitz, Kenji %A Staehle, Dirk %A Tsipotis, Konstantin %D 2001 %N 283 %T QoS of Internet Access with GPRS
• An analytical approach for determining coverage probabilities in large UMTS networks. Tran-Gia, Phuoc; Leibnitz, Kenji; Staehle, Dirk; Schröder, Bernd; Liesenfeld, Bernhard; Weller, Albert. In Proc. of the IEEE Vehicular Technology Conference (VTC-01 Fall). Atlantic City, NJ, 2001.
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  @inproceedings{info3-inproceedings-2001-42, address = {Atlantic City, NJ}, author = {Tran-Gia, Phuoc and Leibnitz, Kenji and Staehle, Dirk and Schröder, Bernd and Liesenfeld, Bernhard and Weller, Albert}, booktitle = {Proc. of the IEEE Vehicular Technology Conference (VTC-01 Fall)}, keywords = {sys:hidden:inproceedings}, month = 10, title = {An analytical approach for determining coverage probabilities in large UMTS networks}, year = 2001 }

  %0 Conference Paper %1 info3-inproceedings-2001-42 %A Tran-Gia, Phuoc %A Leibnitz, Kenji %A Staehle, Dirk %A Schröder, Bernd %A Liesenfeld, Bernhard %A Weller, Albert %B Proc. of the IEEE Vehicular Technology Conference (VTC-01 Fall) %C Atlantic City, NJ %D 2001 %T An analytical approach for determining coverage probabilities in large UMTS networks
• Analytical Characterization of the Soft Handover Gain in UMTS. Tran-Gia, Phuoc; Staehle, Dirk; Heck, Klaus; Schröder, Bernd; Leibnitz, Kenji; Weller, Albert. In Proc. of the IEEE Vehicular Technology Conference (VTC-01 Fall). Atlantic City, NJ, 2001.
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  @inproceedings{info3-inproceedings-2001-41, address = {Atlantic City, NJ}, author = {Tran-Gia, Phuoc and Staehle, Dirk and Heck, Klaus and Schröder, Bernd and Leibnitz, Kenji and Weller, Albert}, booktitle = {Proc. of the IEEE Vehicular Technology Conference (VTC-01 Fall)}, keywords = {sys:hidden:inproceedings}, month = 10, title = {Analytical Characterization of the Soft Handover Gain in UMTS}, year = 2001 }

  %0 Conference Paper %1 info3-inproceedings-2001-41 %A Tran-Gia, Phuoc %A Staehle, Dirk %A Heck, Klaus %A Schröder, Bernd %A Leibnitz, Kenji %A Weller, Albert %B Proc. of the IEEE Vehicular Technology Conference (VTC-01 Fall) %C Atlantic City, NJ %D 2001 %T Analytical Characterization of the Soft Handover Gain in UMTS
• Analytical Characterization of the Soft Handover Gain in UMTS. Technical Report (284), . Tran-Gia, Phuoc; Leibnitz, Kenji; Heck, Klaus; Staehle, Dirk; Schröder, Bernd; Weller, Albert. University of Wuerzburg, 2001.
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  @techreport{info3-techreport-2001-45, author = {Tran-Gia, Phuoc and Leibnitz, Kenji and Heck, Klaus and Staehle, Dirk and Schröder, Bernd and Weller, Albert}, institution = {University of Wuerzburg}, keywords = {sys:hidden:techreport}, month = 10, number = 284, title = {Analytical Characterization of the Soft Handover Gain in UMTS}, year = 2001 }

  %0 Report %1 info3-techreport-2001-45 %A Tran-Gia, Phuoc %A Leibnitz, Kenji %A Heck, Klaus %A Staehle, Dirk %A Schröder, Bernd %A Weller, Albert %D 2001 %N 284 %T Analytical Characterization of the Soft Handover Gain in UMTS
• QoS of Internet Access with GPRS. Tsipotis, Konstantin; Leibnitz, Kenji; Staehle, Dirk. In ACM International Workshop on Modeling Analysis and Simulation of Wireless and Mobile systems (MSWiM 2001). Rome, 2001.
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  @inproceedings{info3-inproceedings-2001-39, address = {Rome}, author = {Tsipotis, Konstantin and Leibnitz, Kenji and Staehle, Dirk}, booktitle = {ACM International Workshop on Modeling Analysis and Simulation of Wireless and Mobile systems (MSWiM 2001)}, keywords = {sys:hidden:inproceedings}, month = {07}, title = {QoS of Internet Access with GPRS}, year = 2001 }

  %0 Conference Paper %1 info3-inproceedings-2001-39 %A Tsipotis, Konstantin %A Leibnitz, Kenji %A Staehle, Dirk %B ACM International Workshop on Modeling Analysis and Simulation of Wireless and Mobile systems (MSWiM 2001) %C Rome %D 2001 %T QoS of Internet Access with GPRS
• Performance Evaluation of Interference and Cell Loading in UMTS Networks. Technical Report (268), . Krauß, Armin; Leibnitz, Kenji. University of Wuerzburg, 2001.
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  @techreport{info3-techreport-2001-43, author = {Krauß, Armin and Leibnitz, Kenji}, institution = {University of Wuerzburg}, keywords = {sys:hidden:techreport}, month = {02}, number = 268, title = {Performance Evaluation of Interference and Cell Loading in UMTS Networks}, year = 2001 }

  %0 Report %1 info3-techreport-2001-43 %A Krauß, Armin %A Leibnitz, Kenji %D 2001 %N 268 %T Performance Evaluation of Interference and Cell Loading in UMTS Networks

• Source Traffic Modeling of Wireless Applications. Technical Report (261), . Staehle, Dirk; Tran-Gia, Phuoc; Leibnitz, Kenji. University of Wuerzburg, 2000.
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  @techreport{info3-techreport-2000-2, author = {Staehle, Dirk and Tran-Gia, Phuoc and Leibnitz, Kenji}, institution = {University of Wuerzburg}, keywords = {sys:hidden:techreport}, month = {06}, number = 261, title = {Source Traffic Modeling of Wireless Applications}, year = 2000 }

  %0 Report %1 info3-techreport-2000-2 %A Staehle, Dirk %A Tran-Gia, Phuoc %A Leibnitz, Kenji %D 2000 %N 261 %T Source Traffic Modeling of Wireless Applications

• Teletraffic models and planning in wireless IP networks. Leibnitz, Kenji; Tran-Gia, Phuoc. In IEEE Wireless Communications and Networking Conference. New Orleans, USA, 1999.
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  @inproceedings{info3-inproceedings-1999-9, address = {New Orleans, USA}, author = {Leibnitz, Kenji and Tran-Gia, Phuoc}, booktitle = {IEEE Wireless Communications and Networking Conference}, keywords = {sys:hidden:inproceedings}, title = {Teletraffic models and planning in wireless IP networks}, year = 1999 }

  %0 Conference Paper %1 info3-inproceedings-1999-9 %A Leibnitz, Kenji %A Tran-Gia, Phuoc %B IEEE Wireless Communications and Networking Conference %C New Orleans, USA %D 1999 %T Teletraffic models and planning in wireless IP networks
• Impact of Clustered Traffic Distributions in CDMA Radio Network Planning. Technical Report (223), . Ehrenberger, Ulrich; Leibnitz, Kenji. University of Wuerzburg, 1999.
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  @techreport{info3-techreport-1999-15, author = {Ehrenberger, Ulrich and Leibnitz, Kenji}, institution = {University of Wuerzburg}, keywords = {sys:hidden:techreport}, month = {03}, number = 223, title = {Impact of Clustered Traffic Distributions in CDMA Radio Network Planning}, year = 1999 }

  %0 Report %1 info3-techreport-1999-15 %A Ehrenberger, Ulrich %A Leibnitz, Kenji %D 1999 %N 223 %T Impact of Clustered Traffic Distributions in CDMA Radio Network Planning
• Adaptive soft-handoff thresholds for CDMA systems with spatial traffic. Remiche, Marie-Ange; Leibnitz, Kenji. In 16th International Teletraffic Congress, pp. 97–106. Edinburgh, UK, 1999.
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  @inproceedings{info3-inproceedings-1999-13, address = {Edinburgh, UK}, author = {Remiche, Marie-Ange and Leibnitz, Kenji}, booktitle = {16th International Teletraffic Congress}, keywords = {sys:hidden:inproceedings}, month = {06}, pages = {97-106}, title = {Adaptive soft-handoff thresholds for CDMA systems with spatial traffic}, year = 1999 }

  %0 Conference Paper %1 info3-inproceedings-1999-13 %A Remiche, Marie-Ange %A Leibnitz, Kenji %B 16th International Teletraffic Congress %C Edinburgh, UK %D 1999 %P 97-106 %T Adaptive soft-handoff thresholds for CDMA systems with spatial traffic
• Impact of clustered traffic distributions in CDMA radio network planning. Leibnitz, Kenji; Ehrenberger, Ulrich. In 16th International Teletraffic Congress, pp. 129–138. Edinburgh, UK, 1999.
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  @inproceedings{info3-inproceedings-1999-16, address = {Edinburgh, UK}, author = {Leibnitz, Kenji and Ehrenberger, Ulrich}, booktitle = {16th International Teletraffic Congress}, keywords = {sys:hidden:inproceedings}, month = {06}, pages = {129-138}, title = {Impact of clustered traffic distributions in CDMA radio network planning}, year = 1999 }

  %0 Conference Paper %1 info3-inproceedings-1999-16 %A Leibnitz, Kenji %A Ehrenberger, Ulrich %B 16th International Teletraffic Congress %C Edinburgh, UK %D 1999 %P 129-138 %T Impact of clustered traffic distributions in CDMA radio network planning
• Impacts of Power Control on Outage Probabilities in CDMA Wireless Networks. Leibnitz, Kenji. In Proc. of IFIP 5th International Conference on Broadband Communications. Hong Kong, 1999.
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  @inproceedings{info3-inproceedings-1999-38, address = {Hong Kong}, author = {Leibnitz, Kenji}, booktitle = {Proc. of IFIP 5th International Conference on Broadband Communications}, keywords = {sys:hidden:inproceedings}, month = 11, title = {Impacts of Power Control on Outage Probabilities in CDMA Wireless Networks}, year = 1999 }

  %0 Conference Paper %1 info3-inproceedings-1999-38 %A Leibnitz, Kenji %B Proc. of IFIP 5th International Conference on Broadband Communications %C Hong Kong %D 1999 %T Impacts of Power Control on Outage Probabilities in CDMA Wireless Networks

• Analysis of the Dynamics of CDMA Reverse Link Power Control. Leibnitz, Kenji; Tran-Gia, Phuoc; Miller, John E. In IEEE GLOBECOM. Sydney, Australia, 1998.
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  @inproceedings{info3-inproceedings-1998-162, address = {Sydney, Australia}, author = {Leibnitz, Kenji and Tran-Gia, Phuoc and Miller, John E.}, booktitle = {IEEE GLOBECOM}, keywords = {sys:hidden:inproceedings}, month = 11, title = {Analysis of the Dynamics of CDMA Reverse Link Power Control}, year = 1998 }

  %0 Conference Paper %1 info3-inproceedings-1998-162 %A Leibnitz, Kenji %A Tran-Gia, Phuoc %A Miller, John E. %B IEEE GLOBECOM %C Sydney, Australia %D 1998 %T Analysis of the Dynamics of CDMA Reverse Link Power Control
• Adaptive Soft-Handoff Thresholds for CDMA Systems with Spatial Traffic. Technical Report (212), . Leibnitz, Kenji; Remiche, Marie-Ange. University of Wuerzburg, 1998.
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  @techreport{info3-techreport-1998-42, author = {Leibnitz, Kenji and Remiche, Marie-Ange}, institution = {University of Wuerzburg}, keywords = {sys:hidden:techreport}, month = 10, number = 212, title = {Adaptive Soft-Handoff Thresholds for CDMA Systems with Spatial Traffic}, year = 1998 }

  %0 Report %1 info3-techreport-1998-42 %A Leibnitz, Kenji %A Remiche, Marie-Ange %D 1998 %N 212 %T Adaptive Soft-Handoff Thresholds for CDMA Systems with Spatial Traffic
• Code Division Multiple Access wireless network planning considering clustered spatial customer traffic. Leibnitz, Kenji; Tran-Gia, Phuoc; Jain, Nikhil. In 8th International Telecommunication Network Planning Symposium. Sorrento, Italy, 1998.
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  @inproceedings{info3-inproceedings-1998-163, address = {Sorrento, Italy}, author = {Leibnitz, Kenji and Tran-Gia, Phuoc and Jain, Nikhil}, booktitle = {8th International Telecommunication Network Planning Symposium}, keywords = {sys:hidden:inproceedings}, month = 10, title = {Code Division Multiple Access wireless network planning considering clustered spatial customer traffic}, year = 1998 }

  %0 Conference Paper %1 info3-inproceedings-1998-163 %A Leibnitz, Kenji %A Tran-Gia, Phuoc %A Jain, Nikhil %B 8th International Telecommunication Network Planning Symposium %C Sorrento, Italy %D 1998 %T Code Division Multiple Access wireless network planning considering clustered spatial customer traffic
• Einsatz von topologieerhaltenden neuronalen Netzen zur Interpretation von Leiterplattendaten. Technical Report (206), . Leibnitz, Kenji; Jodl, Wolfgang; Rothaug, U.; Heuler, Marius. University of Wuerzburg, 1998.
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  @techreport{info3-techreport-1998-21, author = {Leibnitz, Kenji and Jodl, Wolfgang and Rothaug, U. and Heuler, Marius}, institution = {University of Wuerzburg}, keywords = {sys:hidden:techreport}, month = {07}, number = 206, title = {Einsatz von topologieerhaltenden neuronalen Netzen zur Interpretation von Leiterplattendaten}, year = 1998 }

  %0 Report %1 info3-techreport-1998-21 %A Leibnitz, Kenji %A Jodl, Wolfgang %A Rothaug, U. %A Heuler, Marius %D 1998 %N 206 %T Einsatz von topologieerhaltenden neuronalen Netzen zur Interpretation von Leiterplattendaten
• Code Division Multiple Access wireless network planning considering clustered spatial customer traffic. Technical Report (192), . Leibnitz, Kenji; Jain, Nikhil; Tran-Gia, Phuoc. University of Wuerzburg, 1998.
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  @techreport{info3-techreport-1998-27, author = {Leibnitz, Kenji and Jain, Nikhil and Tran-Gia, Phuoc}, institution = {University of Wuerzburg}, keywords = {sys:hidden:techreport}, month = {02}, number = 192, title = {Code Division Multiple Access wireless network planning considering clustered spatial customer traffic}, year = 1998 }

  %0 Report %1 info3-techreport-1998-27 %A Leibnitz, Kenji %A Jain, Nikhil %A Tran-Gia, Phuoc %D 1998 %N 192 %T Code Division Multiple Access wireless network planning considering clustered spatial customer traffic
• Analysis of the Dynamics of CDMA Reverse Link Power Control. Technical Report (193), . Miller, John E.; Tran-Gia, Phuoc; Leibnitz, Kenji. University of Wuerzburg, 1998.
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  @techreport{info3-techreport-1998-26, author = {Miller, John E. and Tran-Gia, Phuoc and Leibnitz, Kenji}, institution = {University of Wuerzburg}, keywords = {sys:hidden:techreport}, month = {02}, number = 193, title = {Analysis of the Dynamics of CDMA Reverse Link Power Control}, year = 1998 }

  %0 Report %1 info3-techreport-1998-26 %A Miller, John E. %A Tran-Gia, Phuoc %A Leibnitz, Kenji %D 1998 %N 193 %T Analysis of the Dynamics of CDMA Reverse Link Power Control
• Teletraffic issues in mobile communication network planning. Leibnitz, Kenji; Tutschku, Kurt; Tran-Gia, Phuoc. In 11th ITC Specialist Seminar. Yokohama, Japan, 1998.
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  @inproceedings{info3-inproceedings-1998-24, address = {Yokohama, Japan}, author = {Leibnitz, Kenji and Tutschku, Kurt and Tran-Gia, Phuoc}, booktitle = {11th ITC Specialist Seminar}, keywords = {sys:hidden:inproceedings}, title = {Teletraffic issues in mobile communication network planning}, year = 1998 }

  %0 Conference Paper %1 info3-inproceedings-1998-24 %A Leibnitz, Kenji %A Tutschku, Kurt %A Tran-Gia, Phuoc %B 11th ITC Specialist Seminar %C Yokohama, Japan %D 1998 %T Teletraffic issues in mobile communication network planning
• Analysis of the dynamics of CDMA reverse link power control. Miller, John E.; Tran-Gia, Phuoc; Leibnitz, Kenji. In IEEE GLOBECOM 98. Sydney, Australia, 1998.
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  @inproceedings{info3-inproceedings-1998-27, address = {Sydney, Australia}, author = {Miller, John E. and Tran-Gia, Phuoc and Leibnitz, Kenji}, booktitle = {IEEE GLOBECOM 98}, keywords = {sys:hidden:inproceedings}, title = {Analysis of the dynamics of CDMA reverse link power control}, year = 1998 }

  %0 Conference Paper %1 info3-inproceedings-1998-27 %A Miller, John E. %A Tran-Gia, Phuoc %A Leibnitz, Kenji %B IEEE GLOBECOM 98 %C Sydney, Australia %D 1998 %T Analysis of the dynamics of CDMA reverse link power control
• Code division multiple access wireless network planning considering clustered spatial customer traffic. Leibnitz, Kenji; Jain, Nikhil; Tran-Gia, Phuoc. In 8th International Telecommunication Network Planning Symposium. Sorrento, Italy, 1998.
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  @inproceedings{info3-inproceedings-1998-25, address = {Sorrento, Italy}, author = {Leibnitz, Kenji and Jain, Nikhil and Tran-Gia, Phuoc}, booktitle = {8th International Telecommunication Network Planning Symposium}, keywords = {sys:hidden:inproceedings}, title = {Code division multiple access wireless network planning considering clustered spatial customer traffic}, year = 1998 }

  %0 Conference Paper %1 info3-inproceedings-1998-25 %A Leibnitz, Kenji %A Jain, Nikhil %A Tran-Gia, Phuoc %B 8th International Telecommunication Network Planning Symposium %C Sorrento, Italy %D 1998 %T Code division multiple access wireless network planning considering clustered spatial customer traffic

• ICEPT - an integrated cellular network planning tool. Leibnitz, Kenji; Tran-Gia, Phuoc; Tutschku, Kurt. In IEEE/VTS 47th Vehicular Technology Conference. Phoenix, AZ, USA, 1997.
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  @inproceedings{info3-inproceedings-1997-30, address = {Phoenix, AZ, USA}, author = {Leibnitz, Kenji and Tran-Gia, Phuoc and Tutschku, Kurt}, booktitle = {IEEE/VTS 47th Vehicular Technology Conference}, keywords = {sys:hidden:inproceedings}, title = {ICEPT - an integrated cellular network planning tool}, year = 1997 }

  %0 Conference Paper %1 info3-inproceedings-1997-30 %A Leibnitz, Kenji %A Tran-Gia, Phuoc %A Tutschku, Kurt %B IEEE/VTS 47th Vehicular Technology Conference %C Phoenix, AZ, USA %D 1997 %T ICEPT - an integrated cellular network planning tool

• Künstliche Neuronale Netze für die Wegeoptimierung in ATG Leiterplattentestern. Technical Report (146), . Leibnitz, Kenji; Tutschku, Kurt; Rothaug, U. University of Wuerzburg, 1996.
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  @techreport{info3-techreport-1996-60, author = {Leibnitz, Kenji and Tutschku, Kurt and Rothaug, U.}, institution = {University of Wuerzburg}, keywords = {sys:hidden:techreport}, month = {07}, number = 146, title = {Künstliche Neuronale Netze für die Wegeoptimierung in ATG Leiterplattentestern}, year = 1996 }

  %0 Report %1 info3-techreport-1996-60 %A Leibnitz, Kenji %A Tutschku, Kurt %A Rothaug, U. %D 1996 %N 146 %T Künstliche Neuronale Netze für die Wegeoptimierung in ATG Leiterplattentestern
• Fast Ray-Tracing for Field Strength Prediction in Cellular Mobile Network Planning. Tutschku, Kurt; Leibnitz, Kenji. In 46th IEEE/VTS Conference on Vehicular Technology 1996. Atlanta, USA, 1996.
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  @inproceedings{info3-inproceedings-1996-60, address = {Atlanta, USA}, author = {Tutschku, Kurt and Leibnitz, Kenji}, booktitle = {46th IEEE/VTS Conference on Vehicular Technology 1996}, keywords = {sys:hidden:inproceedings}, month = {04}, title = {Fast Ray-Tracing for Field Strength Prediction in Cellular Mobile Network Planning}, year = 1996 }

  %0 Conference Paper %1 info3-inproceedings-1996-60 %A Tutschku, Kurt %A Leibnitz, Kenji %B 46th IEEE/VTS Conference on Vehicular Technology 1996 %C Atlanta, USA %D 1996 %T Fast Ray-Tracing for Field Strength Prediction in Cellular Mobile Network Planning

• Field Strength Prediction by Ray-Tracing for Adaptive Base Station Positioning in Mobile Communication Networks. Tutschku, Kurt; Leibnitz, Kenji; Fritsch, Thomas. In 2. ITG Fachtagung Mobile Kommunikation, p. ITG-Fachbericht 135. Neu-Ulm ,Germany, 1995.
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  @inproceedings{info3-inproceedings-1995-59, address = {Neu-Ulm ,Germany}, author = {Tutschku, Kurt and Leibnitz, Kenji and Fritsch, Thomas}, booktitle = {2. ITG Fachtagung Mobile Kommunikation}, keywords = {sys:hidden:inproceedings}, pages = {ITG-Fachbericht 135}, title = {Field Strength Prediction by Ray-Tracing for Adaptive Base Station Positioning in Mobile Communication Networks}, year = 1995 }

  %0 Conference Paper %1 info3-inproceedings-1995-59 %A Tutschku, Kurt %A Leibnitz, Kenji %A Fritsch, Thomas %B 2. ITG Fachtagung Mobile Kommunikation %C Neu-Ulm ,Germany %D 1995 %P ITG-Fachbericht 135 %T Field Strength Prediction by Ray-Tracing for Adaptive Base Station Positioning in Mobile Communication Networks