Events agenda

29 Mar
2012

Network-based Distributed Mobility Management Demo

Carlos J. Bernardos, Associate Professor, UC3M, Spain
The number of mobile users and their traffic demand is expected to be ever-increasing in future years, and this growth can represent a limitation for deploying current mobility management schemes that are intrinsically centralized, e.g., Mobile IPv6 and Proxy Mobile IPv6. For this reason it has been waved a need for distributed and dynamic mobility management approaches, with the objective of reducing operators' burdens, evolving to a cheaper and more efficient architecture.
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20 Mar
2012

Rate Allocation for Layered Multicast Streaming with Inter-Layer Network Coding

Joerg Widmer, Chief Researcher, Institute IMDEA Networks
Rate Allocation for Layered Multicast Streaming with Inter-Layer Network Coding Abstract Multi-layer video streaming allows to provide different video qualities to a group of multicast receivers with heterogeneous receive rates. The number of layers received determines the quality of the decoded video stream. For such layered multicast streaming, network coding provides higher capacity than multicast routing. Network coding can be performed within a layer (intra-layer) or across layers (inter-layer), and in general inter-layer coding outperforms intra-layer coding.
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13 Mar
2012

Distributed Opportunistic Scheduling: A Control Theoretic Approach

Andres Garcia-Saavedra, Ph.D. Candidate, Universidad Carlos III de Madrid
Distributed Opportunistic Scheduling (DOS) techniques have been recently proposed to improve the throughput performance of wireless networks. With DOS, each station contends for the channel with a certain access probability. If a contention is successful, the station measures the channel conditions and transmits in case the channel quality is above a certain threshold.
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6 Mar
2012

VoIPiggy: Implementation and evaluation of a mechanism to boost voice capacity in 802.11 WLANs

Pablo Salvador, Research Assistant, Institute IMDEA Networks
Supporting voice traffic in existing WLANs results extremely inefficient, given the large overheads of the protocol operation and the need to prioritize this traffic over, e.g., bulky transfers. In this paper we propose a simple scheme to improve the efficiency of WLANs when voice traffic is present.
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28 Feb
2012

Contention resolution and packet queuing on a multiple access channel

Dariusz Kowalski, Visiting Researcher, Institute IMDEA Networks
Dr. Kowalski will present recent advances on contention resolution and packet queuing on a multiple access channel. His will include description of algorithms, both already known and newly developed, accompanied by theoretical analysis of queue sizes and latency. He will conclude with showing and elaborating on selected simulation results that support theoretical formulas.
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21 Feb
2012

VIRO: Scalable and Robust Virtual-Id Routing for Future Dynamic Networks

Zhi-Li Zhang, Visiting Researcher, Institute IMDEA Networks; Cátedra de Excelencia, University Carlos III of Madrid, Spain; Qwest Chair Professor, University of Minnesota, Minneapolis, USA
The Internet has transformed itself into a critical global information infrastructure, and fundamentally altered the ways we access information, communicate and interact with each other, purchase goods and services, and entertain ourselves. Despite its enormous success, the Internet suffers certain well-known shortcomings, and is increasingly strained to meet the high availability, reliability, mobility, manageability and security demands of Internet applications, users, and service providers alike.
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14 Feb
2012

An Economic Side-Effect for Prefix Deaggregation

Andra Lutu, Research Assistant, Institute IMDEA Networks
The injection of artificially fragmented prefixes through BGP is a widely used traffic engineering technique. In this paper we examine one particular economic side-effect of deaggregation, namely the impact on the transit traffic bill. We show that the use of more-specific prefixes has a traffic stabilization side-effect which translates into a decrease of the transit traffic bill. We propose an analytical model in order to quantify the impact of deaggregation on the transit costs. We validate our results by means of simulations and through the extensive analysis of real BGP routing information data.
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7 Feb
2012

T4P: Hybrid Interconnection for Cost Reduction

Ignacio Castro, Research Assistant, Institute IMDEA Networks
Economic forces behind the Internet evolution have diversified the types of ISP (Internet Service Provider) interconnections. In particular, settlement-free peering and paid peering proved themselves as effective means for reducing ISP costs. In this paper, we propose T4P (Transit for Peering), a new type of hybrid bilateral ISP relationships that continues the Internet trend towards more flexible interconnections at lower costs.
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31 Jan
2012

Vehicular Networks for Intelligent Transportation Systems: Overview of the Research activities of the "Grupo de Redes de Computadores (GRC)", Universitat Politècnica de València

Dr. Pietro Manzoni, Full Professor of Computer Science at the Universitat Politècnica de València, Spain
Wireless communication for intelligent transportation systems (ITSs) is a promising technology to improve driving safety, reduce traffic congestion and support information services in vehicles. A new era of vehicular networks that include vehicle-to-vehicle (V2V) and vehicle-to-infrastructure (V2I) communications is approaching.
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24 Jan
2012

Bounds on QoS-Constrained Energy Savings in Cellular Access Networks with Sleep Modes

Balaji Rengarajan, Institute IMDEA Networks; Gianluca Rizzo, Institute IMDEA Networks; Marco Ajmone Marsan, Institute IMDEA Networks & Politecnico di Torino
Sleep modes are emerging as a promising technique for energy-efficient networking: by adequately putting to sleep and waking up network resources according to traffic demands, proportionality between energy consumption and network utilization can be approached, with important reductions in energy consumption. Previous studies have investigated and evaluated sleep modes for wireless access networks, computing variable percentages of energy savings.
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