Publications
1.
Festag, A.; H.Karl,; Wolisz, A.
Investigation of Multicast-Based Mobility Support in All-IP Cellular Networks Journal Article
In: Journal on Wireless Communications and Mobile Computing, pp. 15, 2005.
Abstract | Links | BibTeX | Tags: multicast, wireless communication
@article{Festag:MOMBASA:2005,
title = {Investigation of Multicast-Based Mobility Support in All-IP Cellular Networks},
author = {A. Festag and H.Karl and A. Wolisz},
url = {https://www.tkn.tu-berlin.de/fileadmin/fg112/Papers/mombasa.pdf},
year = {2005},
date = {2005-11-01},
urldate = {2005-11-01},
journal = {Journal on Wireless Communications and Mobile Computing},
pages = {15},
abstract = {To solve the IP mobility problem, the use of multicast has been proposed in a number of different approaches, applying multicast in different characteristic ways. We provide a systematic discussion of fundamental options for multicast-based mobility support and the definition and experimental performance evaluation of selected schemes. The discussion is based on an analysis of the architectural, performance-related, and functional requirements. By using these requirements and selecting options regarding network architecture and multicast protocols, we identify promising combinations and derive four case studies for multicast-based mobility in IP-based cellular networks. These case studies include both the standard any-source IP multicast model as well as non-standard multicast models, which optimally utilize the underlying multicast. We describe network architecture and protocols as well as a flexible software environment that allows to easily implement these and other classes of mobility-supporting multicast protocols. Multicast schemes enable a high degree of flexibility for mobility mechanisms in order to meet the service quality required by the applications with minimal protocol overhead. We evaluate this overhead using our software environment by implementing prototypes and quantifying handoff-specific metrics, namely, handoff and paging latency, packet loss and duplication rates, as well as TCP goodput. The measurement results show that these multicast-based schemes improve handoff performance for high mobility in comparison to the reference cases: basic and hierarchical Mobile IP. Comparing the multicast-schemes among each other the performance for the evaluated metrics is very similar. As a result of the conceptual framework classification and our performance evaluations, we justify specific protocol mechanisms that utilize specific features of the multicast. Based on this justification we advocate the usage of a source-specific multicast service model for multicast-based mobility support that adverts the weaknesses of the classical Internet any-source multicast service model.},
keywords = {multicast, wireless communication},
pubstate = {published},
tppubtype = {article}
}
To solve the IP mobility problem, the use of multicast has been proposed in a number of different approaches, applying multicast in different characteristic ways. We provide a systematic discussion of fundamental options for multicast-based mobility support and the definition and experimental performance evaluation of selected schemes. The discussion is based on an analysis of the architectural, performance-related, and functional requirements. By using these requirements and selecting options regarding network architecture and multicast protocols, we identify promising combinations and derive four case studies for multicast-based mobility in IP-based cellular networks. These case studies include both the standard any-source IP multicast model as well as non-standard multicast models, which optimally utilize the underlying multicast. We describe network architecture and protocols as well as a flexible software environment that allows to easily implement these and other classes of mobility-supporting multicast protocols. Multicast schemes enable a high degree of flexibility for mobility mechanisms in order to meet the service quality required by the applications with minimal protocol overhead. We evaluate this overhead using our software environment by implementing prototypes and quantifying handoff-specific metrics, namely, handoff and paging latency, packet loss and duplication rates, as well as TCP goodput. The measurement results show that these multicast-based schemes improve handoff performance for high mobility in comparison to the reference cases: basic and hierarchical Mobile IP. Comparing the multicast-schemes among each other the performance for the evaluated metrics is very similar. As a result of the conceptual framework classification and our performance evaluations, we justify specific protocol mechanisms that utilize specific features of the multicast. Based on this justification we advocate the usage of a source-specific multicast service model for multicast-based mobility support that adverts the weaknesses of the classical Internet any-source multicast service model.
2.
Festag, A.
Mobility Support in IP Cellular Networks – A Multicast-Based Approach PhD Thesis
Technical University of Berlin, School of Electrical Engineering and Computer Sciences, 2003, (Doctoral Dissertation).
Abstract | Links | BibTeX | Tags: mobile communication, multicast
@phdthesis{Festag:PhD:2003,
title = {Mobility Support in IP Cellular Networks – A Multicast-Based Approach},
author = {A. Festag},
url = {https://d-nb.info/968081320/34},
doi = {10.14279/depositonce-784},
year = {2003},
date = {2003-07-08},
urldate = {2003-07-08},
address = {Berlin, Germany},
school = {Technical University of Berlin, School of Electrical Engineering and Computer Sciences},
abstract = {Today's cellular communication networks offer seamless mobility support but are based on a homogeneous networking technology and a complex voice-oriented networking infrastructure. The Internet technology is expected to cause a paradigm shift in cellular communication networks. Mobile IP is the classical solution to support host mobility, but faces a number of disadvantages, including triangular routing and its effect on protocol overhead and end-to-end delays, router ingress filtering, and handover performance. In the dissertation a different approach is pursued that solves the general mobility problem by means of group communication (multicast). In principle, it utilizes the capability of multicast for location-independent addressing and routing, but poses a number of challenges, including the fact that not all mobility functions are offered by the multicast, as well as the open problems of the multicast as it exists in today fixed networks, and problems that arise through the usage of multicast for mobility support, such as the scalability with the number of multicast groups. A few proposals in this area have already been made with different motivations, requirements, and assumptions about the networking architecture. In this dissertation the requirements for multicast-based support of host mobility are identified, as well as mobility functions and basic protocol options elaborated. The three components create a framework for the system and protocol design of multicast-based mobility support that is termed MOMBASA (Mobility Support – A Multicast-Based Approach). The framework is used to judge existing research approaches and serves as a basis to design new schemes and modify existing ones. Four case studies are derived from the framework based on the Any-Source Multicast, the current multicast standard in the Internet, as well as alternative service models. For these case studies a set of protocols are designed that augments the multicast schemes by mobility functions. The methodology of investigation is a combined approach of measurements, simulation, and analysis. For experimental investigation the MOMBASA Software Environment is developed – a generic software platform for experimentation with multicast-based mobility support in IP-based networks. The software environment offers an abstract interface to the multicast, and hence can be used for future investigations of different classes and types of multicast. The MOMBASA Software Environment is part of the evaluation environment that allows to investigate the selected case studies in a common experimental environment under comparable conditions. The results of the dissertation show the feasibility of a mobile communication system with multicast-based mobility support providing the full spectrum of IP services. Potential problems of multicast-based mobility support (e.g. lack of a reliable transport service for multicast, and others) can be avoided. The dissertation presents results of the performance evaluation for handover. Scalability issues are addressed, in particular the signaling costs in a system with multicast-based mobility support determined. All results are compared with the reference case Mobile IP and its hierarchical variant.},
note = {Doctoral Dissertation},
keywords = {mobile communication, multicast},
pubstate = {published},
tppubtype = {phdthesis}
}
Today's cellular communication networks offer seamless mobility support but are based on a homogeneous networking technology and a complex voice-oriented networking infrastructure. The Internet technology is expected to cause a paradigm shift in cellular communication networks. Mobile IP is the classical solution to support host mobility, but faces a number of disadvantages, including triangular routing and its effect on protocol overhead and end-to-end delays, router ingress filtering, and handover performance. In the dissertation a different approach is pursued that solves the general mobility problem by means of group communication (multicast). In principle, it utilizes the capability of multicast for location-independent addressing and routing, but poses a number of challenges, including the fact that not all mobility functions are offered by the multicast, as well as the open problems of the multicast as it exists in today fixed networks, and problems that arise through the usage of multicast for mobility support, such as the scalability with the number of multicast groups. A few proposals in this area have already been made with different motivations, requirements, and assumptions about the networking architecture. In this dissertation the requirements for multicast-based support of host mobility are identified, as well as mobility functions and basic protocol options elaborated. The three components create a framework for the system and protocol design of multicast-based mobility support that is termed MOMBASA (Mobility Support – A Multicast-Based Approach). The framework is used to judge existing research approaches and serves as a basis to design new schemes and modify existing ones. Four case studies are derived from the framework based on the Any-Source Multicast, the current multicast standard in the Internet, as well as alternative service models. For these case studies a set of protocols are designed that augments the multicast schemes by mobility functions. The methodology of investigation is a combined approach of measurements, simulation, and analysis. For experimental investigation the MOMBASA Software Environment is developed – a generic software platform for experimentation with multicast-based mobility support in IP-based networks. The software environment offers an abstract interface to the multicast, and hence can be used for future investigations of different classes and types of multicast. The MOMBASA Software Environment is part of the evaluation environment that allows to investigate the selected case studies in a common experimental environment under comparable conditions. The results of the dissertation show the feasibility of a mobile communication system with multicast-based mobility support providing the full spectrum of IP services. Potential problems of multicast-based mobility support (e.g. lack of a reliable transport service for multicast, and others) can be avoided. The dissertation presents results of the performance evaluation for handover. Scalability issues are addressed, in particular the signaling costs in a system with multicast-based mobility support determined. All results are compared with the reference case Mobile IP and its hierarchical variant.
3.
Festag, A.; Assimakopoulos, T.; Westhoff, L.; Wolisz, A.
Rerouting for Handover in Mobile Networks with Connection-Oriented Backbones: An Experimental Testbed Proceedings Article
In: IEEE Conference on High Performance Switching and Routing (ICATM), pp. 491-499, Heidelberg, Germany, 2000.
Abstract | Links | BibTeX | Tags: mobile communication, multicast
@inproceedings{Festag:ICATM:2000,
title = {Rerouting for Handover in Mobile Networks with Connection-Oriented Backbones: An Experimental Testbed},
author = {A. Festag and T. Assimakopoulos and L. Westhoff and A. Wolisz},
url = {https://ieeexplore.ieee.org/document/856700},
doi = {10.1109/HPSR.2000.856700},
year = {2000},
date = {2000-06-26},
urldate = {2002-08-06},
booktitle = {IEEE Conference on High Performance Switching and Routing (ICATM)},
pages = {491-499},
address = {Heidelberg, Germany},
abstract = {The rerouting of connections for handover in a broadband mobile cellular network is investigated. We address networks with a connection-oriented backbone, which supports quality-of-service (QoS). Moreover it is assumed an IP-style multicast on top of the connection-oriented network. We advocate to utilize the IP-style multicast in order to reroute connections for handover. Three rerouting schemes are proposed, which are based on the IP-style multicast. One of the schemes realizes a predictive approach, where a call is pre-established to potential new base stations by setting up a multicast tree with neighboring base stations as leaf nodes. This approach reduces the handover latency caused by rerouting to an absolute minimum and improves communication with strict time constraints and frequent handover. For experimental investigations of the rerouting schemes a testbed is set up, which is based on an open, non-proprietary, experimental networking environment. Its signaling software offers a direct many-to-many communication, rather than requiring one-to-many overlays and the switching hardware supports scalable and efficient multicast by cell-recycling. The testbed is performance evaluation of the rerouting scheme.},
keywords = {mobile communication, multicast},
pubstate = {published},
tppubtype = {inproceedings}
}
The rerouting of connections for handover in a broadband mobile cellular network is investigated. We address networks with a connection-oriented backbone, which supports quality-of-service (QoS). Moreover it is assumed an IP-style multicast on top of the connection-oriented network. We advocate to utilize the IP-style multicast in order to reroute connections for handover. Three rerouting schemes are proposed, which are based on the IP-style multicast. One of the schemes realizes a predictive approach, where a call is pre-established to potential new base stations by setting up a multicast tree with neighboring base stations as leaf nodes. This approach reduces the handover latency caused by rerouting to an absolute minimum and improves communication with strict time constraints and frequent handover. For experimental investigations of the rerouting schemes a testbed is set up, which is based on an open, non-proprietary, experimental networking environment. Its signaling software offers a direct many-to-many communication, rather than requiring one-to-many overlays and the switching hardware supports scalable and efficient multicast by cell-recycling. The testbed is performance evaluation of the rerouting scheme.