Dr. rer. nat. Norbert Vicari

• 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. Santorini, Greece, 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 = {05}, 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.

• 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. Aachen, Germany, 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 = {07}, 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.

• Modeling of Internet Traffic: Internet Access Influence, User Interference, and TCP Behavior. Technical Report (PhD dissertation), . Vicari, Norbert. PhD dissertation. University of Wuerzburg, 2003, April.
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  @phdthesis{info3-dissertation-2003-13, author = {Vicari, Norbert}, keywords = {sys:hidden:supervisor:phuoc.tran-gia}, month = {04}, school = {University of Wuerzburg}, title = {Modeling of Internet Traffic: Internet Access Influence, User Interference, and TCP Behavior}, year = 2003 }

  %0 Thesis %1 info3-dissertation-2003-13 %A Vicari, Norbert %D 2003 %T Modeling of Internet Traffic: Internet Access Influence, User Interference, and TCP Behavior

• Analytic Performance Evaluation of the RED Algorithm for QoS in TCP/IP Networks. Vicari, Norbert; Köhler, Stefan; Menth, Michael. In 9th IFIP Working Conference on Performance Modelling and Evaluation of ATM & IP Networks, pp. 178–190. Budapest, Hungary, 2001.
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  @inproceedings{info3-inproceedings-2001-49, address = {Budapest, Hungary}, author = {Vicari, Norbert and Köhler, Stefan and Menth, Michael}, booktitle = {9th IFIP Working Conference on Performance Modelling and Evaluation of ATM & IP Networks}, keywords = {sys:hidden:inproceedings}, pages = {178 - 190}, title = {Analytic Performance Evaluation of the RED Algorithm for QoS in TCP/IP Networks}, year = 2001 }

  %0 Conference Paper %1 info3-inproceedings-2001-49 %A Vicari, Norbert %A Köhler, Stefan %A Menth, Michael %B 9th IFIP Working Conference on Performance Modelling and Evaluation of ATM & IP Networks %C Budapest, Hungary %D 2001 %P 178 - 190 %T Analytic Performance Evaluation of the RED Algorithm for QoS in TCP/IP Networks

• COST-257 Final Report - Impacts of New Services on the Architecture and Performance of Broadband Networks. Management Committee, COST-257; Tran-Gia, Phuoc; Vicari, Norbert. 2000.
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  @book{info3-book-2000-4, author = {Management Committee, COST-257 and Tran-Gia, Phuoc and Vicari, Norbert}, keywords = {sys:hidden:book}, month = {09}, title = {COST-257 Final Report - Impacts of New Services on the Architecture and Performance of Broadband Networks}, year = 2000 }

  %0 Book %1 info3-book-2000-4 %A Management Committee, COST-257 %A Tran-Gia, Phuoc %A Vicari, Norbert %D 2000 %T COST-257 Final Report - Impacts of New Services on the Architecture and Performance of Broadband Networks
• Measuring internet user traffic behavior dependent on access speed. Vicari, Norbert; Köhler, Stefan. In ITC Specialist Seminar on IP Traffic Measurement, Modeling and Management. Monterey, CA, USA, 2000.
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  @inproceedings{info3-inproceedings-2000-1, address = {Monterey, CA, USA}, author = {Vicari, Norbert and Köhler, Stefan}, booktitle = {ITC Specialist Seminar on IP Traffic Measurement, Modeling and Management}, keywords = {sys:hidden:inproceedings}, month = {09}, title = {Measuring internet user traffic behavior dependent on access speed}, year = 2000 }

  %0 Conference Paper %1 info3-inproceedings-2000-1 %A Vicari, Norbert %A Köhler, Stefan %B ITC Specialist Seminar on IP Traffic Measurement, Modeling and Management %C Monterey, CA, USA %D 2000 %T Measuring internet user traffic behavior dependent on access speed
• Analytic Performance Evaluation of the RED Algorithm for QoS in TCP/IP Networks. Technical Report (259), . Vicari, Norbert; Menth, Michael; Köhler, Stefan. University of Wuerzburg, 2000.
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  @techreport{info3-techreport-2000-3, author = {Vicari, Norbert and Menth, Michael and Köhler, Stefan}, institution = {University of Wuerzburg}, keywords = {sys:hidden:techreport}, month = {05}, number = 259, title = {Analytic Performance Evaluation of the RED Algorithm for QoS in TCP/IP Networks}, year = 2000 }

  %0 Report %1 info3-techreport-2000-3 %A Vicari, Norbert %A Menth, Michael %A Köhler, Stefan %D 2000 %N 259 %T Analytic Performance Evaluation of the RED Algorithm for QoS in TCP/IP Networks
• The Dependence of Internet User Characteristics on Access Speed. Technical Report (246), . Vicari, Norbert; Köhler, Stefan; Charzinski, Joachim. University of Wuerzburg, 2000.
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  @techreport{info3-techreport-2000-7, author = {Vicari, Norbert and Köhler, Stefan and Charzinski, Joachim}, institution = {University of Wuerzburg}, keywords = {sys:hidden:techreport}, month = {01}, number = 246, title = {The Dependence of Internet User Characteristics on Access Speed}, year = 2000 }

  %0 Report %1 info3-techreport-2000-7 %A Vicari, Norbert %A Köhler, Stefan %A Charzinski, Joachim %D 2000 %N 246 %T The Dependence of Internet User Characteristics on Access Speed

• Effects of variations in the available bandwidth on the performance of the GFR service. Vicari, Norbert. In Fifth Internetional Conference on Broadband Communications - BC’99, pp. 197–208. Hong Kong, China, 1999.
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  @inproceedings{info3-inproceedings-1999-6, address = {Hong Kong, China}, author = {Vicari, Norbert}, booktitle = {Fifth Internetional Conference on Broadband Communications - BC'99}, keywords = {sys:hidden:inproceedings}, pages = {197 - 208}, title = {Effects of variations in the available bandwidth on the performance of the GFR service}, year = 1999 }

  %0 Conference Paper %1 info3-inproceedings-1999-6 %A Vicari, Norbert %B Fifth Internetional Conference on Broadband Communications - BC'99 %C Hong Kong, China %D 1999 %P 197 - 208 %T Effects of variations in the available bandwidth on the performance of the GFR service
• A Numerical Analysis of the M/D^b/N Queueing System. Technical Report (235), . Dümmler, Matthias; Vicari, Norbert. University of Wuerzburg, 1999.
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  @techreport{info3-techreport-1999-10, author = {Dümmler, Matthias and Vicari, Norbert}, institution = {University of Wuerzburg}, keywords = {sys:hidden:techreport}, month = {07}, number = 235, title = {A Numerical Analysis of the M/D^b/N Queueing System}, year = 1999 }

  %0 Report %1 info3-techreport-1999-10 %A Dümmler, Matthias %A Vicari, Norbert %D 1999 %N 235 %T A Numerical Analysis of the M/D^b/N Queueing System
• Performance of the GFR-service with constant available bandwidth. Vicari, Norbert; Schedel, Robert. In IEEE INFOCOM’99, pp. 567–574. New York, USA, 1999.
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  @inproceedings{info3-inproceedings-1999-5, address = {New York, USA}, author = {Vicari, Norbert and Schedel, Robert}, booktitle = {IEEE INFOCOM'99}, keywords = {sys:hidden:inproceedings}, pages = {567 - 574}, title = {Performance of the GFR-service with constant available bandwidth}, year = 1999 }

  %0 Conference Paper %1 info3-inproceedings-1999-5 %A Vicari, Norbert %A Schedel, Robert %B IEEE INFOCOM'99 %C New York, USA %D 1999 %P 567 - 574 %T Performance of the GFR-service with constant available bandwidth
• Measuring Internet User Traffic Behavior Dependent on Access Speed. Technical Report (238), . Köhler, Stefan; Vicari, Norbert. University of Wuerzburg, 1999.
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  @techreport{info3-techreport-1999-8, author = {Köhler, Stefan and Vicari, Norbert}, institution = {University of Wuerzburg}, keywords = {sys:hidden:techreport}, month = 10, number = 238, title = {Measuring Internet User Traffic Behavior Dependent on Access Speed}, year = 1999 }

  %0 Report %1 info3-techreport-1999-8 %A Köhler, Stefan %A Vicari, Norbert %D 1999 %N 238 %T Measuring Internet User Traffic Behavior Dependent on Access Speed

• Effects of Variations in the Available Bandwidth on the Performance of the GFR Service. Technical Report (214), . Vicari, Norbert. University of Wuerzburg, 1998.
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  @techreport{info3-techreport-1998-17, author = {Vicari, Norbert}, institution = {University of Wuerzburg}, keywords = {sys:hidden:techreport}, month = 10, number = 214, title = {Effects of Variations in the Available Bandwidth on the Performance of the GFR Service}, year = 1998 }

  %0 Report %1 info3-techreport-1998-17 %A Vicari, Norbert %D 1998 %N 214 %T Effects of Variations in the Available Bandwidth on the Performance of the GFR Service
• Performance of the GFR-Service with Constant Available Bandwidth. Technical Report (207), . Vicari, Norbert; Schedel, Robert. University of Wuerzburg, 1998.
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  @techreport{info3-techreport-1998-20, author = {Vicari, Norbert and Schedel, Robert}, institution = {University of Wuerzburg}, keywords = {sys:hidden:techreport}, month = {07}, number = 207, title = {Performance of the GFR-Service with Constant Available Bandwidth}, year = 1998 }

  %0 Report %1 info3-techreport-1998-20 %A Vicari, Norbert %A Schedel, Robert %D 1998 %N 207 %T Performance of the GFR-Service with Constant Available Bandwidth
• Models of WWW-Traffic: a Comparison of Pareto and Logarithmic Histogram Models. Technical Report (198), . Vicari, Norbert. University of Wuerzburg, 1998.
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  @techreport{info3-techreport-1998-25, author = {Vicari, Norbert}, institution = {University of Wuerzburg}, keywords = {sys:hidden:techreport}, month = {03}, number = 198, title = {Models of WWW-Traffic: a Comparison of Pareto and Logarithmic Histogram Models}, year = 1998 }

  %0 Report %1 info3-techreport-1998-25 %A Vicari, Norbert %D 1998 %N 198 %T Models of WWW-Traffic: a Comparison of Pareto and Logarithmic Histogram Models
• Models of WWW-traffic: a comparison of pareto and logarithmic histogram models. Vicari, Norbert. In 5th Polish Teletraffic Symposium / Project COPERNICUS 1463 ATMiN - Closing Seminar, pp. 2.2–1 . 1998.
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  @inproceedings{info3-inproceedings-1998-20, author = {Vicari, Norbert}, booktitle = {5th Polish Teletraffic Symposium / Project COPERNICUS 1463 ATMiN - Closing Seminar}, keywords = {sys:hidden:inproceedings}, pages = {2.2-1 - 2.2-12}, title = {Models of WWW-traffic: a comparison of pareto and logarithmic histogram models}, year = 1998 }

  %0 Conference Paper %1 info3-inproceedings-1998-20 %A Vicari, Norbert %B 5th Polish Teletraffic Symposium / Project COPERNICUS 1463 ATMiN - Closing Seminar %D 1998 %P 2.2-1 - 2.2-12 %T Models of WWW-traffic: a comparison of pareto and logarithmic histogram models

• Measurement and Modeling of WWW-Sessions. Technical Report (184), . Vicari, Norbert. University of Wuerzburg, 1997.
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  @techreport{info3-techreport-1997-31, author = {Vicari, Norbert}, institution = {University of Wuerzburg}, keywords = {sys:hidden:techreport}, month = {09}, number = 184, title = {Measurement and Modeling of WWW-Sessions}, year = 1997 }

  %0 Report %1 info3-techreport-1997-31 %A Vicari, Norbert %D 1997 %N 184 %T Measurement and Modeling of WWW-Sessions
• Resource-Based Charging of ATM Connections. Technical Report (170), . Vicari, Norbert. University of Wuerzburg, 1997.
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  @techreport{info3-techreport-1997-37, author = {Vicari, Norbert}, institution = {University of Wuerzburg}, keywords = {sys:hidden:techreport}, month = {04}, number = 170, title = {Resource-Based Charging of ATM Connections}, year = 1997 }

  %0 Report %1 info3-techreport-1997-37 %A Vicari, Norbert %D 1997 %N 170 %T Resource-Based Charging of ATM Connections

• A numerical analysis of the Geo/D/N queueing system. Technical Report (151), . Tran-Gia, Phuoc; Vicari, Norbert. University of Wuerzburg, 1996.
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  @techreport{info3-techreport-1996-92, author = {Tran-Gia, Phuoc and Vicari, Norbert}, institution = {University of Wuerzburg}, keywords = {sys:hidden:techreport}, month = {09}, number = 151, title = {A numerical analysis of the Geo/D/N queueing system}, year = 1996 }

  %0 Report %1 info3-techreport-1996-92 %A Tran-Gia, Phuoc %A Vicari, Norbert %D 1996 %N 151 %T A numerical analysis of the Geo/D/N queueing system