Siemens Capi (funded by Siemens AG)

Supporting Vertical Handover by Using a Pastry Peer-to-Peer Overlay Network. Zinner, Thomas. Euro-FGI Annual Plenary Meeting, Salerno, Italy, 2008, February 27.

[ BibTeX ]
[ EndNote ]

@presentation{info3-talk-2008-269,
  address = {Euro-FGI Annual Plenary Meeting, Salerno, Italy},
  author = {Zinner, Thomas},
  keywords = {sys:hidden:presentation},
  month = {02},
  title = {Supporting Vertical Handover by Using a Pastry Peer-to-Peer Overlay Network},
  year = 2008
}

%0 Generic
%1 info3-talk-2008-269
%A Zinner, Thomas
%C Euro-FGI Annual Plenary Meeting, Salerno, Italy
%D 2008
%T Supporting Vertical Handover by Using a Pastry Peer-to-Peer Overlay Network

Supporting Vertical Handover by a Self-Organizing Multi-Dimensional P2P Overlay. Hoßfeld, Tobias. VTC2006-Spring, Melbourne, Australia, 2006, May 9.

[ BibTeX ]
[ EndNote ]

@presentation{info3-talk-2006-170,
  address = {VTC2006-Spring, Melbourne, Australia},
  author = {Hoßfeld, Tobias},
  keywords = {sys:hidden:presentation},
  month = {05},
  title = {Supporting Vertical Handover by a Self-Organizing Multi-Dimensional P2P Overlay},
  year = 2006
}

%0 Generic
%1 info3-talk-2006-170
%A Hoßfeld, Tobias
%C VTC2006-Spring, Melbourne, Australia
%D 2006
%T Supporting Vertical Handover by a Self-Organizing Multi-Dimensional P2P Overlay

Verlässliche Peer-to-Peer Technologie als Steuerungsverfahren für zukünftige mobile Zugangsnetze. Andersen, Frank-Uwe; Tutschku, Kurt; Hoßfeld, Tobias; Oechsner, Simon. In 11. ITG-Mobilfunktagung, Technologien und Anwendungen, ISBN 3-8007-2942-3. Osnabrück, Germany, 2006.

[ Abstract ]
[ BibTeX ]
[ EndNote ]
[ Download ]

Gegenstand unserer Untersuchung ist der Einsatz von verlässlicher „Peer-to-Peer“ (P2P) Technologie innerhalb Betreiber-eigener Kernnetze mit dem Ziel, eine Dezentralisierung von Steuerungsdiensten zu erreichen. Als Anwendung besonders aussichtsreich erscheint die Unterstützung von Handover-Vorgängen in heterogenen Radio- Zugangsnetzen (z.B. 802.11x und 3G). Während hierfür zwar recht schnell P2P-Lösungen gefunden werden können, die grundsätzlich funktionieren, besteht die Herausforderung darin, die als immanent angenommenen Vorteile von P2P wie Skalierbarkeit, Selbstorganisation und Robustheit den hohen Anforderungen von Betreibern nach „Verlässlichkeit“ gegenüberzustellen, und, wo möglich, die Zuverlässigkeit zu erhöhen. Anhand zweier Beispiele werden solche Optimierungen beschrieben. Als Referenz dienen ein neues Handover-Verfahren für „Beyond 3G“ (B3G) Netze mit heterogenen Funktechniken sowie ein verallgemeinertes, klassisches Netzwerkmanagement in 3G-Netzen.

@inproceedings{info3-inproceedings-2006-233,
  abstract = {Gegenstand unserer Untersuchung ist der Einsatz von verlässlicher „Peer-to-Peer“ (P2P) Technologie innerhalb Betreiber-eigener Kernnetze mit dem Ziel, eine Dezentralisierung von Steuerungsdiensten zu erreichen. Als Anwendung besonders aussichtsreich erscheint die Unterstützung von Handover-Vorgängen in heterogenen Radio- Zugangsnetzen (z.B. 802.11x und 3G). Während hierfür zwar recht schnell P2P-Lösungen gefunden werden können, die grundsätzlich funktionieren, besteht die Herausforderung darin, die als immanent angenommenen Vorteile von P2P wie Skalierbarkeit, Selbstorganisation und Robustheit den hohen Anforderungen von Betreibern nach „Verlässlichkeit“ gegenüberzustellen, und, wo möglich, die Zuverlässigkeit zu erhöhen. Anhand zweier Beispiele werden solche Optimierungen beschrieben. Als Referenz dienen ein neues Handover-Verfahren für „Beyond 3G“ (B3G) Netze mit heterogenen Funktechniken sowie ein verallgemeinertes, klassisches Netzwerkmanagement in 3G-Netzen.},
  address = {Osnabrück, Germany},
  author = {Andersen, Frank-Uwe and Tutschku, Kurt and Hoßfeld, Tobias and Oechsner, Simon},
  booktitle = {11. ITG-Mobilfunktagung, Technologien und Anwendungen, ISBN 3-8007-2942-3},
  keywords = {sys:hidden:inproceedings},
  month = {05},
  title = {Verlässliche Peer-to-Peer Technologie als Steuerungsverfahren für zukünftige mobile Zugangsnetze},
  year = 2006
}

%0 Conference Paper
%1 info3-inproceedings-2006-233
%A Andersen, Frank-Uwe
%A Tutschku, Kurt
%A Hoßfeld, Tobias
%A Oechsner, Simon
%B 11. ITG-Mobilfunktagung, Technologien und Anwendungen, ISBN 3-8007-2942-3
%C Osnabrück, Germany
%D 2006
%T Verlässliche Peer-to-Peer Technologie als Steuerungsverfahren für zukünftige mobile Zugangsnetze
%X Gegenstand unserer Untersuchung ist der Einsatz von verlässlicher „Peer-to-Peer“ (P2P) Technologie innerhalb Betreiber-eigener Kernnetze mit dem Ziel, eine Dezentralisierung von Steuerungsdiensten zu erreichen. Als Anwendung besonders aussichtsreich erscheint die Unterstützung von Handover-Vorgängen in heterogenen Radio- Zugangsnetzen (z.B. 802.11x und 3G). Während hierfür zwar recht schnell P2P-Lösungen gefunden werden können, die grundsätzlich funktionieren, besteht die Herausforderung darin, die als immanent angenommenen Vorteile von P2P wie Skalierbarkeit, Selbstorganisation und Robustheit den hohen Anforderungen von Betreibern nach „Verlässlichkeit“ gegenüberzustellen, und, wo möglich, die Zuverlässigkeit zu erhöhen. Anhand zweier Beispiele werden solche Optimierungen beschrieben. Als Referenz dienen ein neues Handover-Verfahren für „Beyond 3G“ (B3G) Netze mit heterogenen Funktechniken sowie ein verallgemeinertes, klassisches Netzwerkmanagement in 3G-Netzen.

Supporting Vertical Handover by a Self-Organizing Multi-Dimensional P2P Overlay. Oechsner, Simon; Hoßfeld, Tobias; Tutschku, Kurt; Andersen, Frank-Uwe. In 2006 IEEE 63rd Vehicular Technology Conference. Melbourne, Australia, 2006.

[ Abstract ]
[ BibTeX ]
[ EndNote ]
[ Download ]

Vertical handovers (VHO) are expected to be a key feature in Beyond 3G (B3G) networks. This paper presents a CAN-based P2P overlay network for supporting vertical handover in B3G networks. The P2P overlay is used to quickly locate attachment points (APs) for mobile entities and to retrieve rapidly the configuration and coverage information of these APs. The advantage of the P2P-based solution is its distributed nature, its scalability, and its self-organizing capability. We show by means of simulation the efficiency and the scalability of our approach in comparison to a standard CAN implementation.

@inproceedings{info3-inproceedings-2006-214,
  abstract = {Vertical handovers (VHO) are expected to be a key feature in Beyond 3G (B3G) networks. This paper presents a CAN-based P2P overlay network for supporting vertical handover in B3G networks. The P2P overlay is used to quickly locate attachment points (APs) for mobile entities and to retrieve rapidly the configuration and coverage information of these APs. The advantage of the P2P-based solution is its distributed nature, its scalability, and its self-organizing capability. We show by means of simulation the efficiency and the scalability of our approach in comparison to a standard CAN implementation.},
  address = {Melbourne, Australia},
  author = {Oechsner, Simon and Hoßfeld, Tobias and Tutschku, Kurt and Andersen, Frank-Uwe},
  booktitle = {2006 IEEE 63rd Vehicular Technology Conference},
  keywords = {sys:hidden:inproceedings},
  month = {05},
  title = {Supporting Vertical Handover by a Self-Organizing Multi-Dimensional P2P Overlay},
  year = 2006
}

%0 Conference Paper
%1 info3-inproceedings-2006-214
%A Oechsner, Simon
%A Hoßfeld, Tobias
%A Tutschku, Kurt
%A Andersen, Frank-Uwe
%B 2006 IEEE 63rd Vehicular Technology Conference
%C Melbourne, Australia
%D 2006
%T Supporting Vertical Handover by a Self-Organizing Multi-Dimensional P2P Overlay
%X Vertical handovers (VHO) are expected to be a key feature in Beyond 3G (B3G) networks. This paper presents a CAN-based P2P overlay network for supporting vertical handover in B3G networks. The P2P overlay is used to quickly locate attachment points (APs) for mobile entities and to retrieve rapidly the configuration and coverage information of these APs. The advantage of the P2P-based solution is its distributed nature, its scalability, and its self-organizing capability. We show by means of simulation the efficiency and the scalability of our approach in comparison to a standard CAN implementation.

Evaluation of a Pastry-Based P2P Overlay for Supporting Vertical Handover. Oechsner, Simon. Wireless Communications and Networking Conference 2006, 2006, April 4.

[ BibTeX ]
[ EndNote ]

@presentation{info3-talk-2006-183,
  address = {Wireless Communications and Networking Conference 2006},
  author = {Oechsner, Simon},
  keywords = {sys:hidden:presentation},
  month = {04},
  title = {Evaluation of a Pastry-Based P2P Overlay for Supporting Vertical Handover},
  year = 2006
}

%0 Generic
%1 info3-talk-2006-183
%A Oechsner, Simon
%C Wireless Communications and Networking Conference 2006
%D 2006
%T Evaluation of a Pastry-Based P2P Overlay for Supporting Vertical Handover

Evaluation of a Pastry-based P2P Overlay for Supporting Vertical Handover. Hoßfeld, Tobias; Oechsner, Simon; Tutschku, Kurt; Andersen, Frank-Uwe. In IEEE Wireless Communications and Networking Conference, p. 6. Las Vegas, NV, USA, 2006.

[ Abstract ]
[ BibTeX ]
[ EndNote ]
[ Download ]

Vertical handovers (VHO) are expected to be a key feature in Beyond 3G (B3G) networks. This paper presents and evaluates a Pastry-based P2P overlay network for supporting vertical handover in B3G networks. The P2P overlay is used to quickly locate attachment points (APs) for mobile entities and to retrieve rapidly the configuration and coverage information of these APs. The advantage of the P2P-based solution is its distributed nature, its scalability, and its self-organizing capability. The performance of the P2P-based VHO support architecture is evaluated in terms of the search time for APs, the scalability of the algorithm, and for homogenous and heterogeneous network layouts. In addition, the solution is compared with the conventional client/server approach.

@inproceedings{info3-inproceedings-2006-213,
  abstract = {Vertical handovers (VHO) are expected to be a key feature in Beyond 3G (B3G) networks. This paper presents and evaluates a Pastry-based P2P overlay network for supporting vertical handover in B3G networks. The P2P overlay is used to quickly locate attachment points (APs) for mobile entities and to retrieve rapidly the configuration and coverage information of these APs. The advantage of the P2P-based solution is its distributed nature, its scalability, and its self-organizing capability. The performance of the P2P-based VHO support architecture is evaluated in terms of the search time for APs, the scalability of the algorithm, and for homogenous and heterogeneous network layouts. In addition, the solution is compared with the conventional client/server approach.},
  address = {Las Vegas, NV, USA},
  author = {Hoßfeld, Tobias and Oechsner, Simon and Tutschku, Kurt and Andersen, Frank-Uwe},
  booktitle = {IEEE Wireless Communications and Networking Conference},
  keywords = {sys:hidden:inproceedings},
  month = {04},
  pages = 6,
  title = {Evaluation of a Pastry-based P2P Overlay for Supporting Vertical Handover},
  year = 2006
}

%0 Conference Paper
%1 info3-inproceedings-2006-213
%A Hoßfeld, Tobias
%A Oechsner, Simon
%A Tutschku, Kurt
%A Andersen, Frank-Uwe
%B IEEE Wireless Communications and Networking Conference
%C Las Vegas, NV, USA
%D 2006
%P 6
%T Evaluation of a Pastry-based P2P Overlay for Supporting Vertical Handover
%X Vertical handovers (VHO) are expected to be a key feature in Beyond 3G (B3G) networks. This paper presents and evaluates a Pastry-based P2P overlay network for supporting vertical handover in B3G networks. The P2P overlay is used to quickly locate attachment points (APs) for mobile entities and to retrieve rapidly the configuration and coverage information of these APs. The advantage of the P2P-based solution is its distributed nature, its scalability, and its self-organizing capability. The performance of the P2P-based VHO support architecture is evaluated in terms of the search time for APs, the scalability of the algorithm, and for homogenous and heterogeneous network layouts. In addition, the solution is compared with the conventional client/server approach.

Supporting Vertical Handover by Using a Pastry Peer-to-Peer Overlay Network. Hoßfeld, Tobias. Mobile Peer-to-Peer Computing MP2P’06, in conjunction with the 4th IEEE International Conference on Pervasive Computing and Communications (PerCom’06), Pisa, Italy, 2006, March 17.

[ BibTeX ]
[ EndNote ]

@presentation{info3-talk-2006-148,
  address = {Mobile Peer-to-Peer Computing MP2P'06, in conjunction with the 4th IEEE International Conference on Pervasive Computing and Communications (PerCom'06), Pisa, Italy},
  author = {Hoßfeld, Tobias},
  keywords = {sys:hidden:presentation},
  month = {03},
  title = {Supporting Vertical Handover by Using a Pastry Peer-to-Peer Overlay Network},
  year = 2006
}

%0 Generic
%1 info3-talk-2006-148
%A Hoßfeld, Tobias
%C Mobile Peer-to-Peer Computing MP2P'06, in conjunction with the 4th IEEE International Conference on Pervasive Computing and Communications (PerCom'06), Pisa, Italy
%D 2006
%T Supporting Vertical Handover by Using a Pastry Peer-to-Peer Overlay Network

Using Kademlia for the Configuration of B3G Radio Access Nodes. Oechsner, Simon. Mobile Peer-to-Peer Computing MP2P’06, Pisa, Italy, 2006, March 17.

[ BibTeX ]
[ EndNote ]

@presentation{info3-talk-2006-212,
  address = {Mobile Peer-to-Peer Computing MP2P'06, Pisa, Italy},
  author = {Oechsner, Simon},
  keywords = {sys:hidden:presentation},
  month = {03},
  title = {Using Kademlia for the Configuration of B3G Radio Access Nodes},
  year = 2006
}

%0 Generic
%1 info3-talk-2006-212
%A Oechsner, Simon
%C Mobile Peer-to-Peer Computing MP2P'06, Pisa, Italy
%D 2006
%T Using Kademlia for the Configuration of B3G Radio Access Nodes

Using Kademlia for the Configuration of B3G Radio Access Nodes. Oechsner, Simon; Hoßfeld, Tobias; Tutschku, Kurt; Andersen, Frank-Uwe; Caviglione, Luca. In Mobile Peer-to-Peer Computing MP2P’06, in conjunction with the 4th IEEE International Conference on Pervasive Computing and Communications (PerCom’06). Pisa, Italy, 2006.

[ Abstract ]
[ BibTeX ]
[ EndNote ]
[ Download ]

Configuration and management of radio access nodes in Beyond 3G (B3G) networks such as NodeBs, Wireless LAN or WIMAX access points is a complex task that consumes a high amount of resources. Most configuration changes have to be done by an operator, especially when it comes to the adaption of a node to its environment, i.e., the cells surrounding its own. This is an expensive and inflexible method. Moreover, the required manual interference hampers the adaptivity of B3G networks towards topology changes. In this work, we present an architecture that allows for the detection of neighboring cells, thereby enabling an easy or even autonomic configuration of the access nodes. In addition to this, the presented Kademlia-based overlay network enables the storage of information needed for network management, such as configuration data or performance measures.

@inproceedings{info3-inproceedings-2006-206,
  abstract = {Configuration and management of radio access nodes in Beyond 3G (B3G) networks such as NodeBs, Wireless LAN or WIMAX access points is a complex task that consumes a high amount of resources. Most configuration changes have to be done by an operator, especially when it comes to the adaption of a node to its environment, i.e., the cells surrounding its own. This is an expensive and inflexible method. Moreover, the required manual interference hampers the adaptivity of B3G networks towards topology changes. In this work, we present an architecture that allows for the detection of neighboring cells, thereby enabling an easy or even autonomic configuration of the access nodes. In addition to this, the presented Kademlia-based overlay network enables the storage of information needed for network management, such as configuration data or performance measures.},
  address = {Pisa, Italy},
  author = {Oechsner, Simon and Hoßfeld, Tobias and Tutschku, Kurt and Andersen, Frank-Uwe and Caviglione, Luca},
  booktitle = {Mobile Peer-to-Peer Computing MP2P'06, in conjunction with the 4th IEEE International Conference on Pervasive Computing and Communications (PerCom'06)},
  keywords = {sys:hidden:inproceedings},
  month = {03},
  title = {Using Kademlia for the Configuration of B3G Radio Access Nodes},
  year = 2006
}

%0 Conference Paper
%1 info3-inproceedings-2006-206
%A Oechsner, Simon
%A Hoßfeld, Tobias
%A Tutschku, Kurt
%A Andersen, Frank-Uwe
%A Caviglione, Luca
%B Mobile Peer-to-Peer Computing MP2P'06, in conjunction with the 4th IEEE International Conference on Pervasive Computing and Communications (PerCom'06)
%C Pisa, Italy
%D 2006
%T Using Kademlia for the Configuration of B3G Radio Access Nodes
%X Configuration and management of radio access nodes in Beyond 3G (B3G) networks such as NodeBs, Wireless LAN or WIMAX access points is a complex task that consumes a high amount of resources. Most configuration changes have to be done by an operator, especially when it comes to the adaption of a node to its environment, i.e., the cells surrounding its own. This is an expensive and inflexible method. Moreover, the required manual interference hampers the adaptivity of B3G networks towards topology changes. In this work, we present an architecture that allows for the detection of neighboring cells, thereby enabling an easy or even autonomic configuration of the access nodes. In addition to this, the presented Kademlia-based overlay network enables the storage of information needed for network management, such as configuration data or performance measures.

Supporting Vertical Handover by Using a Pastry Peer-to-Peer Overlay Network. Hoßfeld, Tobias; Oechsner, Simon; Tutschku, Kurt; Andersen, Frank-Uwe; Caviglione, Luca. In Mobile Peer-to-Peer Computing MP2P’06, in conjunction with the 4th IEEE International Conference on Pervasive Computing and Communications (PerCom’06). Pisa, Italy, 2006.

[ Abstract ]
[ BibTeX ]
[ EndNote ]
[ Download ]

Vertical handovers (VHO) are expected to be a key feature in Beyond 3G (B3G) networks. This paper presents a Pastry-based P2P overlay network for supporting vertical handover in B3G networks. The P2P overlay is used to quickly locate attachment points (APs) for mobile entities and to rapidly retrieve the configuration and coverage information of these APs. The advantage of the P2P-based solution is its distributed nature, its scalability, and its self-organizing capability.

@inproceedings{info3-inproceedings-2006-205,
  abstract = {Vertical handovers (VHO) are expected to be a key feature in Beyond 3G (B3G) networks. This paper presents a Pastry-based P2P overlay network for supporting vertical handover in B3G networks. The P2P overlay is used to quickly locate attachment points (APs) for mobile entities and to rapidly retrieve the configuration and coverage information of these APs. The advantage of the P2P-based solution is its distributed nature, its scalability, and its self-organizing capability.},
  address = {Pisa, Italy},
  author = {Hoßfeld, Tobias and Oechsner, Simon and Tutschku, Kurt and Andersen, Frank-Uwe and Caviglione, Luca},
  booktitle = {Mobile Peer-to-Peer Computing MP2P'06, in conjunction with the 4th IEEE International Conference on Pervasive Computing and Communications (PerCom'06)},
  keywords = {sys:hidden:inproceedings},
  month = {03},
  title = {Supporting Vertical Handover by Using a Pastry Peer-to-Peer Overlay Network},
  year = 2006
}

%0 Conference Paper
%1 info3-inproceedings-2006-205
%A Hoßfeld, Tobias
%A Oechsner, Simon
%A Tutschku, Kurt
%A Andersen, Frank-Uwe
%A Caviglione, Luca
%B Mobile Peer-to-Peer Computing MP2P'06, in conjunction with the 4th IEEE International Conference on Pervasive Computing and Communications (PerCom'06)
%C Pisa, Italy
%D 2006
%T Supporting Vertical Handover by Using a Pastry Peer-to-Peer Overlay Network
%X Vertical handovers (VHO) are expected to be a key feature in Beyond 3G (B3G) networks. This paper presents a Pastry-based P2P overlay network for supporting vertical handover in B3G networks. The P2P overlay is used to quickly locate attachment points (APs) for mobile entities and to rapidly retrieve the configuration and coverage information of these APs. The advantage of the P2P-based solution is its distributed nature, its scalability, and its self-organizing capability.

Evaluation of a Pastry-based P2P Overlay for Supporting Vertical Handover. Technical Report (368), . Hoßfeld, Tobias; Oechsner, Simon; Tutschku, Kurt; Andersen, Frank-Uwe. University of Wuerzburg, 2005.

[ BibTeX ]
[ EndNote ]
[ Download ]

@techreport{info3-techreport-2005-186,
  author = {Hoßfeld, Tobias and Oechsner, Simon and Tutschku, Kurt and Andersen, Frank-Uwe},
  institution = {University of Wuerzburg},
  keywords = {sys:hidden:techreport},
  month = 10,
  number = 368,
  title = {Evaluation of a Pastry-based P2P Overlay for Supporting Vertical Handover},
  year = 2005
}

%0 Report
%1 info3-techreport-2005-186
%A Hoßfeld, Tobias
%A Oechsner, Simon
%A Tutschku, Kurt
%A Andersen, Frank-Uwe
%D 2005
%N 368
%T Evaluation of a Pastry-based P2P Overlay for Supporting Vertical Handover

Using Kademlia for the Configuration of B3G Radio Access Nodes. Technical Report (370), . Oechsner, Simon; Hoßfeld, Tobias; Tutschku, Kurt; Andersen, Frank-Uwe; Caviglione, Luca. University of Wuerzburg, 2005.

[ BibTeX ]
[ EndNote ]
[ Download ]

@techreport{info3-techreport-2005-187,
  author = {Oechsner, Simon and Hoßfeld, Tobias and Tutschku, Kurt and Andersen, Frank-Uwe and Caviglione, Luca},
  institution = {University of Wuerzburg},
  keywords = {sys:hidden:techreport},
  month = 10,
  number = 370,
  title = {Using Kademlia for the Configuration of B3G Radio Access Nodes},
  year = 2005
}

%0 Report
%1 info3-techreport-2005-187
%A Oechsner, Simon
%A Hoßfeld, Tobias
%A Tutschku, Kurt
%A Andersen, Frank-Uwe
%A Caviglione, Luca
%D 2005
%N 370
%T Using Kademlia for the Configuration of B3G Radio Access Nodes

Supporting Vertical Handover by Using a Pastry Peer-to-Peer Overlay Network. Technical Report (367), . Hoßfeld, Tobias; Oechsner, Simon; Tutschku, Kurt; Andersen, Frank-Uwe; Caviglione, Luca. University of Wuerzburg, 2005.

[ BibTeX ]
[ EndNote ]
[ Download ]

@techreport{info3-techreport-2005-185,
  author = {Hoßfeld, Tobias and Oechsner, Simon and Tutschku, Kurt and Andersen, Frank-Uwe and Caviglione, Luca},
  institution = {University of Wuerzburg},
  keywords = {sys:hidden:techreport},
  month = {09},
  number = 367,
  title = {Supporting Vertical Handover by Using a Pastry Peer-to-Peer Overlay Network},
  year = 2005
}

%0 Report
%1 info3-techreport-2005-185
%A Hoßfeld, Tobias
%A Oechsner, Simon
%A Tutschku, Kurt
%A Andersen, Frank-Uwe
%A Caviglione, Luca
%D 2005
%N 367
%T Supporting Vertical Handover by Using a Pastry Peer-to-Peer Overlay Network

Carrier-Grade Peer-to-Peer

CaPi Project Team

Summary

Publications

Hinweis zum Datenschutz

Hinweis zum Datenschutz

Bildnachweise