We focus on collaborative video streaming in wired overlay networks using low cost network codes. We propose a scheme that builds on both rateless codes and network coding in order to improve the system throughput and the video quality at clients. Our hybrid coding algorithm permits to efficiently exploit the available source and path diversity, without the need either for expensive routing or for scheduling algorithms.

Si desea más información sobre el Dr. Tiago Camilo, visita su perfil en Linkedin: http://www.linkedin.com/in/tiagocamilo

Más información sobre Nokia Siemens Networks

Con el título La Ciencia es mi Vida, entre las 19:00 y las 21:00 horas del viernes 28 de septiembre de 2012, se va a celebrar en la Residencia de Estudiantes de Madrid (calle Pinar 21-23) una mesa redonda que, moderada por el catedrático de Física Teórica Alfredo Poves, va a reunir a varios investigadores de los Institutos Madrileños de Estudios Avanzados (IMDEA).

El próximo miércoles, 13 de noviembre, se celebra en la Escuela Politécnica Superior (Campus de Leganés) de la Universidad Carlos III de Madrid (UC3M), la próxima reunión de ESNOG/GORE (España Network Operators Group / Grupo de Operadores de Red Españoles), contando con el patrocinio de la Cátedra Telefónica de la UC3M y ESPANIX (Punto neutro Español de Internet). Es una jornada que tendrá en agenda una serie de conferencias y mesas redondas sobre Internet a nivel de red.

Already a popular application in the Internet, IPTV is becoming, among the service providers, a preferred alternative to conventional Broadcasting technologies. Since many of the existing deployments have been done within the safe harbor of telcos own networks, IP multicast has been the desired streaming solution. However, previous studies showed that the popularity of the TV channels follows the Pareto principle, with the bulk of TV channels being watched only by a small fraction of viewers. Recognizing the potential scalability issues, we believe that multicast streaming approach may not be desirable for unpopular TV channels, especially when there are many such channels in the provider's service package. For this reason, the peer-to-peer content distribution paradigm is seen as an alternative, in particular for non-popular content. In order to analyze its viability, in this paper we perform a comparative analysis between IP multicast and a peer-to-peer overlay using unicast connections as streaming approaches, in the context of channels with different degrees of popularity. Our findings show that while multicast is always more efficient in terms of bandwidth utilization, peer-to-peer has a comparable performance for unpopular channels with a low number of viewers.

This seminar builds on your basic knowledge of computer networks from an introductory computer networks class or equivalent. It covers mathematical and algorithmic foundations of the essential networking functions of data transfer, transfer control, and management. Essential concepts of some techniques, such as optimization, control theory, queuing theory, and their application to networks are covered.

Combined advances in high speed networking, mobile devices, application sharing, web services, virtual world technologies and large scale event processing are converging to create a new world of pervasive, ubiquitous “presence” of users, which offers tremendous potential for social interaction and co-creation. The communication networking and computing requirements of this converged human-centric environment are also increasing at an accelerated pace. In this new environment, it is imperative that the much-needed networking and computing resources align closely with the needs and patterns dictated by the applications, social networks, and by the human users. We believe that the success of such socio-technical systems will hinge on the way networks capture and interact with human presence and location, in all of its physical, virtual and perceived aspects.

espite the broadly title, the seminar will be focused in the notion of max-min fairness (MMF) and its application to routing optimization in communication networks:

1. Basic notions
2. Convex MMF problems
3. Non-convex MMF problems
4. Examples of MMF routing optimization problems

Ponentes:

• Dr. Sergey Gorinsky (Senior Researcher, IMDEA Networks)
• Prof. Dr. Arturo Azcorra (Director General de Transferencia de Tecnología y Desarrollo Empresarial (Ministerio de Ciencia e Innovación)
• Paul Patras (Research Assistant, IMDEA Networks)
• Dr. Mary Luz Mouronte (Division Manager, Telefonica Research, Madrid)
• Dr. Albert Banchs (Deputy Director, IMDEA Networks; Profesor Titular, UC3M)
• Prof. Dr. Narasimha Reddy (Cátedra de Excelencia, Universidad Carlos III de Madrid; Visiting Researcher, IMDEA Networks, Madrid; Texas A&M University, USA)
• Alejandro Javier Tosina González (Representante español en ICT Committee – EU Framework Programme; CDTI – Ministerio de Ciencia e Innovación)

Localización: Sala de Audiovisuales, Sala 3.1.S08, Edificio Rey Pastor (Biblioteca), Universidad Carlos III de Madrid, Avda. Universidad, 30, 28911 Leganés – Madrid.
Fecha: 11 de Noviembre, 2009, 15:00 – 18:00.
Organización: IMDEA Networks en colaboración con la Escuela Politécnica Superior, Universidad Carlos III de Madrid, Campus de Leganés.

La conferencia se impartirá en Inglés.
Registro previo: rebeca.demiguel imdea.org

Dr. Kenichi Mase, Dr. Toshini Tsuboi and Dr. Hiromi Ueda will visit Institute IMDEA Networkson Monday September 20th and will take the opportunity to present their research lines. The overall talk will last about 45 minutes, including questions and answers, and it will be divided in the following three 15 minute slots: