Events agenda

25 May
2009

Mobility – Background, State-of-the-art, Challenges and Approaches

Dr. Fernando Boavida, FCTUC – University of Coimbra (Portugal), Visiting Professor at University Carlos III of Madrid (Spain)
Mobility is, without doubt, one of the major new paradigms of the current Internet, and this is driving most of the research activity in networking throughout the World. We are gradually evolving from a network where most end-systems have a fixed or quasi-fixed point of attachment, towards a global network where end systems seamlessly move from network to network and where networks themselves change their connection point to the Internet. In spite of this there is still a long way to go before user and network mobility – at IP level – become a reality, as several technological and research challenges persist.
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19 May
2009

Multipath TCP

Iljitsch van Beijnum, Research Assistant (IMDEA Networks)
Normal TCP/IP operation is for the routing system to select a best path that remains stable for some time, and for TCP to adjust to the properties of this path to optimize throughput. A multipath TCP would be able to either use capacity on multiple paths, or dynamically find the best performing path, and therefore reach higher throughput. By adapting to the properties of several paths through the usual congestion control algorithms, a multipath TCP shifts its traffic to less congested paths, leaving more capacity available for traffic that can't move to another path on more congested paths. And when a path fails, this can be detected and worked around by TCP much more quickly than by waiting for the routing system to repair the failure.
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12 May
2009

xIP - eXtending IPv4 address space

Michal Kryczka, Research Assistant, IMDEA Networks
Sorry, this entry is only available in European Spanish.  Instructor:  Lugar:  Fecha: 12th May, 2009, 10:00 – 11:00 Organización:   
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28 Apr
2009

Stability in Networks with Aggregate Schedulers

Gianluca Rizzo, EPFL Lausanne (Switzerland)
Some among the most widespread applications of the Internet (real-time streaming multimedia applications) are based on packet exchanges that assume a very low packet delay. In order to offer some form of better service to this kind of traffic some architectural frameworks have been proposed, in which traffic sources obey some form of constraints on the maximum number of packets sent in every time interval, in which traffic is subdivided into classes, and where at any node all packets are served taking only into account the class to which they belong to. For these networks an open issue is their stability, that is the possibility to derive finite bounds to packet delay and queue size at each node.
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27 Apr
2009

Load Balancing is Not Optimal in Wireless Systems With Dynamic Interference

Balaji Rengarajan, PhD Candidate, The University of Texas at Austin (Texas, USA)
We study the impact of policies to associate users with base stations/access points on flow-level performance in interference limited wireless networks. Most research in this area has used static interference models (i.e., neighboring base stations are always active) and resorted to intuitive objectives such as load balancing. In this paper, we show that this can be counter productive, and that asymmetries in load can lead to significantly better performance in the presence of dynamic interference which couples the transmission rates experienced by users at various base stations. We propose a methodology that can be used to optimize the performance of a class of coupled systems, and apply it to study the user association problem. We show that by properly inducing load asymmetries, substantial performance gains can be achieved relative to a load balancing policy (e.g., 15 times reduction in mean delay). We present a novel measurement based, interference-aware association policy that infers the degree of interference induced coupling and adapts to it.
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24 Apr
2009

Betting on Challenges for Flourishing Ambient Intelligence

Dr. Rosa Iglesias, Ikerlan Technological Research (Mondragón, Spain)
This talk will present a brief overview of systems, technologies and applications that are part of Ambient Intelligence (AmI). It is also the purpose of this talk to bring together researchers for inspiring innovation in the evolution of AmI and for answering the question: What are the challenges we need to bet on?
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13 Apr
2009

4GSensor, Paradigms for the Next Generation Wireless Sensor Networks

Dr. Tiago Camilo, Nokia Siemens Networks
If you would like more information about Dr. Tiago Camilo, please visit his Linkedin profile: http://www.linkedin.com/in/tiagocamilo More information about Nokia Siemens Networks
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2 Apr
2009

JTP: An Energy-conscious Transport Protocol for Ad Hoc Networks

Dr. Alberto Medina, Internetwork Research Group, BBN Technologies (Cambridge, England, United Kingdom)
JTP: An Energy-conscious Transport Protocol for Ad Hoc Networks Energy consciousness is percolating rapidly through all areas of research for technologies that are power driven. In the context of networking, the area of ad hoc networks has been the main driving factor pushing energy-related research, with significant efforts pursued mainly at the physical, data-link and routing layers of the protocol stack.
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18 Mar
2009

An Algebraic Approach to Internet Routing

Prof. Dr. Tim Griffin, University of Cambridge
A great deal of of interesting work was done in the 1970s in generalizing shortest path algorithms to a wide class of semirings also called "path algebras" or "dioids". Although the evolution of Internet Routing protocols does not seem to have taken much inspiration from this work, recent "reverse engineering" efforts have demonstrated that an algebraic approach is very useful for both understanding existing protocols and for exploring the design space of future Internet routing protocols. This course is intended teach participants the basic concepts needed to understand this approach. No previous background will be assumed. 
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