Publications

@article{Wunder:ComMag:2014,

title = {5GNOW: Non-Orthogonal, Asynchronous Waveforms for Future Mobile Applications},

author = {G. Wunder and P. Jung and M. Kasparick and T. Wild and F. Schaich and Y. Chen and S. tenBrink and I. Gaspar and N. Michailow and A. Festag and L. Mendes and N. Cassiau and D. Kténas and M. Dryjanski and S. Pietrzyk and B. Eged and P. Vago},

url = {https://ieeexplore.ieee.org/document/6736749},

doi = {10.1109/MCOM.2014.6736749},

year  = {2014},

date = {2014-02-19},

urldate = {2014-02-19},

journal = {IEEE Communications Magazine},

volume = {52},

number = {2},

pages = {97-105},

abstract = {This article provides some fundamental indications about wireless communications beyond LTE/LTE-A (5G), representing the key findings of the European research project 5GNOW. We start with identifying the drivers for making the transition to 5G networks. Just to name one, the advent of the Internet of Things and its integration with conventional human-initiated transmissions creates a need for a fundamental system redesign. Then we make clear that the strict paradigm of synchronism and orthogonality as applied in LTE prevents efficiency and scalability. We challenge this paradigm and propose new key PHY layer technology components such as a unified frame structure, multicarrier waveform design including a filtering functionality, sparse signal processing mechanisms, a robustness framework, and transmissions with very short latency. These components enable indeed an efficient and scalable air interface supporting the highly varying set of requirements originating from the 5G drivers.},

keywords = {wireless communication},

pubstate = {published},

tppubtype = {article}

}

@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}

}

@article{Weinmiller:MNET:1997,

title = {Performance Study of Access Control in Wireless LANs – IEEE 802.11 DFWMAC and ETSI RES10 HIPERLAN},

author = {J. Weinmiller and M. Schläger and A. Festag and A. Wolisz},

url = {https://dl.acm.org/doi/10.1023/A:1013255927445},

doi = {10.1023/A:1013255927445},

year  = {1997},

date = {1997-06-01},

urldate = {1997-06-01},

journal = {ACM Journal on Mobile Networks and Applications (Special Issue on Channel Access)},

volume = {2},

number = {1},

pages = {55-76},

abstract = {Currently two projects are on their way to standardize physical layer and medium access control for wireless LANs - IEEE 802.11 and ETSI RES 10 Hiperlan. This paper presents an introduction to both projects focusing on the applied access schemes. Further we will present our simulation results, analyzing the performance of both access protocols depending on the number of stations and on the packet size, evaluating them regarding their capability to support QoS parameters, regarding the impact of hidden terminals and their range extension strategy.},

keywords = {simulation, wireless communication},

pubstate = {published},

tppubtype = {article}

}