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Displaying 1-21 out of 21 total
A Light-Weight Implementation Scheme of the Tree Morphing Protocol for Mobile Multicast Sources
Found in: EUROMICRO Conference
By Olaf Christ, Thomas C. Schmidt, Matthias Wahlisch
Issue Date:August 2007
pp. 149-156
<p>Multicast network services advantageously complement multimedia information and communication technologies, as they open up the realm for highly scalable multicustomer applications. Mobile environments providing shared limited bandwidth to a growi...
Socialize online learning: Why we should integrate learning content management with Online Social Networks
Found in: Pervasive Computing and Communications Workshops, IEEE International Conference on
By Hendrik Roreger,Thomas C. Schmidt
Issue Date:March 2012
pp. 685-690
Lifelong learning is a common requirement in today's knowledge society. Traditional teaching approaches fail to deliver learning opportunities if combined with flexibility in time and place, which is another major requirement. Therefore, eLearning systems ...
Vitamin C for your smartphone: the SKIMS approach for cooperativeand lightweight security at mobiles
Found in: Proceedings of the ACM SIGCOMM 2012 conference on Applications, technologies, architectures, and protocols for computer communication (SIGCOMM '12)
By Benjamin Jochheim, Christian Keil, Dirk Westhoff, Jochen Schönfelder, Jochen Schiller, Martin Kutscher, Matthias Küster, Matthias Wählisch, Osman Ugus, Sebastian Trapp, Theodor Nolte, Thomas C. Schmidt
Issue Date:August 2012
pp. 271-272
Smartphones are popular attack targets, but usually too weak in applying common protection concepts. SKIMS designs and implements a cooperative, cross-layer security system for mobile devices. Detection mechanisms as well as a proactive and reactive defens...
Large-scale measurement and analysis of one-way delay in hybrid multicast networks
Found in: 2012 IEEE 37th Conference on Local Computer Networks (LCN 2012)
By Sebastian Meiling,Thomas C. Schmidt,Matthias Wahlisch
Issue Date:October 2012
pp. 513-520
Group communication plays an important role in the distribution of real-time data for IPTV, multimedia conferencing, or online multiplayer games, but IP multicast remains unsupported in today's global Internet. Hybrid solutions that bridge between overlay ...
Towards Seamless Handovers in SSM Source Mobility
Found in: Next Generation Mobile Applications, Services and Technologies, International Conference on
By Olaf Christ, Thomas C. Schmidt, Matthias Wählisch
Issue Date:September 2008
pp. 456-461
Multimedia networking in the near future is expected to be dominated by group applications such as IPTV, MMORPGs, and video conferencing. Hand in hand with new service offers, the deployment of multicast at the network layer startet to disseminate. Current...
On the Correlation of Geographic and Network Proximity at Internet Edges and Its Implications for Mobile Unicast and Multicast Routing
Found in: International Conference on Networking
By Thomas C. Schmidt, Matthias Wahlisch, Ying Zhang
Issue Date:April 2007
pp. 94
Significant effort has been invested recently to ac- celerate handover operations in a next generation mo- bile Internet. Corresponding works for developing effi- cient mobile multicast management are emergent. Both problems simultaneously expose routing c...
A First Performance Analysis of the Tree Morphing Approach to IPv6 Source Mobility in Source Specific Multicast Routing
Found in: Mobile Communications and Learning Technologies, Conference on Networking, Conference on Systems, International Conference on
By Thomas C. Schmidt, Matthias Wahlisch
Issue Date:April 2006
pp. 87
Source Specific Multicast (SSM) promises a wider dissemination of group distribution services than Any Source Multicast, as it relies on simpler routing strategies with reduced demands on the infrastructure. However, SSM is designed for ? priori known and ...
Performance Analysis of Time-Triggered Ether-Networks Using Off-the-Shelf-Components
Found in: Object/Component/Service-Oriented Real-Time Distributed Computing Workshops , IEEE International Symposium on
By Florian Bartols, Till Steinbach, Franz Korf, Thomas C. Schmidt
Issue Date:March 2011
pp. 49-56
The performance analysis and validation of distributed real-time systems poses significant challenges due to high accuracy requirements at the measurement tools. A fully synchronized time-scale at ultrafine granularity is not easy to generate. Even though ...
QoS Performance Study of One Way Link Characteristics in an IEEE 802.16d TDD System
Found in: Advanced International Conference on Telecommunications
By Maik Wodarz, James P. Taisie, Thomas C. Schmidt
Issue Date:May 2010
pp. 241-246
WiMAX systems are beginning to spread as a wide-area wireless access technology that provides QoS support for future multimedia applications. Vendors have started to ship off-the-shelf hardware that addresses the market of broadband Internet coverage in sp...
Broadcasting in Prefix Space: P2P Data Dissemination with Predictable Performance
Found in: Internet and Web Applications and Services, International Conference on
By Matthias Wählisch, Thomas C. Schmidt, Georg Wittenburg
Issue Date:May 2009
pp. 74-83
A broadcast mode may augment peer-to-peer overlay networks with an efficient, scalable data replication function, but may also give rise to a virtual link layer in VPN-type solutions. We introduce a generic, simple broadcasting mechanism that operates in t...
Peer-to-peer videoconferencing with H.264 software codec for mobiles
Found in: A World of Wireless, Mobile and Multimedia Networks, International Symposium on
By Hans L. Cycon, Thomas C. Schmidt, Gabriel Hege, Matthias Waahlisch, Detlev Marpe, Mark Palkow
Issue Date:June 2008
pp. 1-6
A rapidly growing number of carriers offer wireless video services to their customers, taking advantage of high quality video codecs implemented in dedicated hardware of selected mobile devices. In this paper we introduce a video conferencing software, whi...
Scalable Mobile Multimedia Group Conferencing Based on SIP Initiated SSM
Found in: European Conference on Universal Multiservice Networks
By Thomas C. Schmidt, Matthias Wahlisch, Hans L. Cycon, Mark Palkow
Issue Date:February 2007
pp. 200-209
Multimedia group communication emerges to focal interest at mobile devices, enriching voice or video conferencing and complex collaborative environments. The Internet uniquely provides the benefit of scalable, dynamic group communication services, vitally ...
Towards a nation-centric understanding of the internet
Found in: Proceedings of the ACM CoNEXT Student Workshop (CoNEXT '10 Student Workshop)
By Markus de Brun, Matthias Wahlisch, Sebastian Meiling, Thomas C. Schmidt, Thomas Haberlen
Issue Date:November 2010
pp. 1-2
Data communication in the Internet is based on the borderless interplay of Autonomous Systems (ASes). An AS abstracts one or multiple IP networks, which may be globally distributed, but is owned by an organization located in a country. Current research on ...
Native actors: a scalable software platform for distributed, heterogeneous environments
Found in: Proceedings of the 2013 workshop on Programming based on actors, agents, and decentralized control (AGERE! '13)
By Dominik Charousset, Matthias Wählisch, Raphael Hiesgen, Thomas C. Schmidt
Issue Date:October 2013
pp. 87-96
Writing concurrent software is challenging, especially with low-level synchronization primitives such as threads or locks in shared memory environments. The actor model replaces implicit communication by an explicit message passing in a 'hared-nothing' par...
A scalable communication infrastructure for smart grid applications using multicast over public networks
Found in: Proceedings of the 28th Annual ACM Symposium on Applied Computing (SAC '13)
By Matthias Wählisch, Sebastian Meiling, Thomas C. Schmidt, Till Steinbach
Issue Date:March 2013
pp. 690-694
The transition to regenerative energy resources paves the path from a small number of large power plants to a grid of highly distributed, heterogeneous small generators. To establish a Smart Grid it requires a scalable machine-to-machine communication that...
Actors and publish/subscribe: an efficient approach to scalable distribution in data centers
Found in: Proceedings of the 2012 ACM conference on CoNEXT student workshop (CoNEXT Student '12)
By Dominik Charousset, Matthias Wählisch, Thomas C. Schmidt
Issue Date:December 2012
pp. 53-54
Data center applications are required to be fault-tolerant and self-healing, and at the same time to scale dynamically with the number of available hardware resources. Highly efficient task distribution is crucial for such services that require low latency...
Exploring reachability via settlement-free peering
Found in: Proceedings of the 2012 ACM conference on CoNEXT student workshop (CoNEXT Student '12)
By Matthias Wählisch, Sebastian Meyer, Thomas C. Schmidt
Issue Date:December 2012
pp. 49-50
The importance of an autonomous system is typically derived by its economic relevance, in Internet terms measured by the number of customer ASes it provides with connectivity. Such simple business relationship does not hold anymore. In this paper, we analy...
Towards detecting BGP route hijacking using the RPKI
Found in: Proceedings of the ACM SIGCOMM 2012 conference on Applications, technologies, architectures, and protocols for computer communication (SIGCOMM '12)
By Matthias Wählisch, Olaf Maennel, Thomas C. Schmidt
Issue Date:August 2012
pp. 103-104
Prefix hijacking has always been a big concern in the Internet. Some events made it into the international world-news, but most of them remain unreported or even unnoticed. The scale of the problem can only be estimated. The Resource Publication Infrastruc...
Bulk of interest: performance measurement of content-centric routing
Found in: Proceedings of the ACM SIGCOMM 2012 conference on Applications, technologies, architectures, and protocols for computer communication (SIGCOMM '12)
By Markus Vahlenkamp, Matthias Wählisch, Thomas C. Schmidt
Issue Date:August 2012
pp. 99-100
The paradigm of information-centric networking subsumes recent approaches to integrate content replication services into a future Internet layer. Current concepts foster either a dynamic mapping that directs content requests to a nearby copy, or an immedia...
A middleware for transparent group communication of globally distributed actors
Found in: Proceedings of the Workshop on Posters and Demos Track (PDT '11)
By Dominik Charousset, Matthias Wahlisch, Sebastian Meiling, Thomas C. Schmidt
Issue Date:December 2011
pp. 1-2
Actors have been designed for loosely coupled concurrent systems based on asynchronous message passing. This model is of particular relevance for Internet-wide distribution, but cannot unfold its full potential due to the lack of a globally available messa...
First insights from a mobile honeypot
Found in: Proceedings of the ACM SIGCOMM 2012 conference on Applications, technologies, architectures, and protocols for computer communication (SIGCOMM '12)
By Christian Keil, Jochen Schönfelder, Jochen Schiller, Matthias Wählisch, Sebastian Trapp, Thomas C. schmidt
Issue Date:August 2012
pp. 305-306
Computer systems are commonly attacked by malicious transport contacts. We present a comparative study that analyzes to what extent those attacks depend on the network access, in particular if an adversary targets specifically on mobile or non-mobile devic...