Análisis y evaluación de los sistemas de protección contra la congestión en la red digital de sevicios integrados de banda ancha

Postprint (published version

Actividades para fomentar las competencias transversales relacionadas con el razonamiento científico-técnico

Este artículo describe dos actividades que los autores llevan a cabo desde hace unos años en asignaturas de los últimos cursos de ingeniería y del máster de investigación que imparten. Estas actividades tienen por objetivo desarrollar competencias transversales tales como el razonamiento crítico, la capacidad de análisis y comprensión de trabajos científicos, y la argumentación y debate de opiniones contrapuestas, y están encaminadas a fomentar el razonamiento científico- técnico de los estudiantes. En concreto las actividades a las que nos referimos son de dos tipos, 1) sesiones de debate de artículos científico-técnicos y 2) preparación de preguntas tipo para examen. En el artículo se describen con detalle cómo se materializan estas dos actividades, y se realiza una evaluación cualitativa y cuantitativa del resultado de la experiencia, que nos permite concluir que contribuyen decisivamente a la formación de los estudiantes en las competencias transversales arriba mencionadas y, por lo tanto a mejorar el proceso de aprendizaje en general.SUMMARY -- This article describes two activities that the authors are carrying out since a few years ago in the latest courses of the engineering degree and masters they are teaching. These activities aim to develop generic skills such as critical thinking, the ability of analysis and understanding of scientific work, and the argumentation and discussion of opposing views. All of them are aimed at encouraging scientific and technical reasoning of students. These activities are the discussion/debate sessions of scientific-technical papers and the preparation of exam-like questions. The paper describes in detail how these two activities have been materialized and a qualitative and quantitative evaluation is provided. Out of this evaluation, the usefulness of these activities can be validated, and it can be concluded that they strongly contribute to the training of students in the transversal competences focus of this work and, as a consequence to improve the learning process

Analysis of the threshold between GPON and EP2P

New services like Video on demand, Television (IPTV), high speed Internet access and Voice over IP on top the same link are called Triple Play services. These services demand very high bandwidth to customers. ADSL and ADLS2+ aren’t enough for supporting the new bandwidth requirement. One suitable solution for high bandwidth demand with a long reach is to use optical cable to customers (FTTX). Nowadays there are two technologies GPON (Gigabit passive optical network) and EP2P (Ethernet point-to-point) fighting for to be implemented in network access. This paper makes an evaluation between both solutions and it tries to answer the next question: What is the best solution for supporting requirement of Triple Play applications?Preprin

El idioma vehicular docente; un reto a la movilidad en el Espacio Europeo de Enseñanza Superior (EEES)

La asignatura Servicios Públicos de Datos (SPD) de Ingeniería Informática de la Universidad Politécnica de Cataluña se está adaptando a los requerimientos que plantea el Espacio Europeo de Enseñanza Superior introduciendo conceptos de nuevos paradigmas docentes en base a la integración de la enseñanza expositiva y el trabajo cooperativo. La utilización del Campus Virtual basado en tecnología Moodle de la Universidad permite además una mayor flexibilidad y una mayor adaptación de los estudiantes a las nuevas metodologías docentes, destacando todo aquello que hace referencia a los sistemas de evaluación ECTS y al trabajo cooperativo con interdependencia positiva. Ante un escenario como el indicado, un nuevo reto surge en el horizonte educativo relacionado con el idioma vehicular docente. La movilidad de los estudiantes europeos, uno de los fundamentos del EEES, abre nuevas fuentes de problemas docentes relacionados con la comunicación entre estudiantes y profesores, ya que la predominancia del idioma inglés como vehicular a nivel mundial, no debe necesariamente ser incompatible con la utilización de los idiomas locales. La búsqueda del equilibrio en el uso de distintos idiomas docentes, respetando el derecho de la movilidad y la comunicación de los estudiantes europeos, no debe estar reñido con el mantenimiento de la cultura lingüística de cada región. Este artículo explica la experiencia de los últimos años en SPD en este sentido, considerando la casuística propia de Cataluña que dispone de dos idiomas oficiales. Los resultados son esperanzadores en el sentido de que la presencia en los últimos años de estudiantes Erasmus da suficientes pistas de cómo se puede afrontar el tema, y de que la flexibilidad se postula como la herramienta más eficaz a la hora de afrontar con garantías de éxito la problemática.Este trabajo ha sido parcialmente financiado por el MEC bajo el proyecto CATARO (TES2005-08051-C03-01)

Integració del aprenentatge cooperatiu i del ensenyament expositiu a través del campus virtual

Es presenta un model per compaginar l'activitat docent expositiva i l'aprenentatge cooperatiu utilitzant les eines del campus virtual ATENEA. El mètode docent utilitzat està fonamentat en l'ús de les metodologies educatives grupals seguint el model EEES i realitzant part de les seves activitats fora de les aules de manera virtual i amb això optimitzar l'ús del temps dins de les mateixes. Els resultats obtinguts, en una assignatura tecnològica de segon cicle, indiquen que la metodologia millora els resultats acadèmics i de qualitat, i que millora la responsabilitat i implicació dels alumnes en el seu procés d'aprenentatge.Peer Reviewe

Informática y telecomunicación: el acicate de la sobrenota

En el plan de estudios de Ingeniería Informática de la Facultad de Informática, de la Universidad Politécnica de Cataluña, hay una asignatura denominada Servicios Públicos de Datos (SPD) que es un puente entre la Informática y las Telecomunicaciones, en la que se estudian conceptos de redes de telecomunicación que van a ser de gran utilidad para los futuros ingenieros en informática. La asignatura está concebida como semestral e implementa desde hace algún tiempo un sistema de evaluación basado en el concepto de sobrenota que se ha mostrado como un método eficaz para encontrar la complicidad del estudiante en su evaluación, aspecto considerado de alto interés en el Espacio Europeo de Enseñanza Universitaria. En la presente ponencia, se desarrolla la metodología y el contenido de la asignatura, y se analiza la importancia de facilitar al estudiante su implicación personal en una materia, las redes de telecomunicación, que en la mayoría de los casos resulta poco atractiva para el informático, pero que se ha convertido en un complemento muy importante para sus posibilidades de empleo

Who shot optical packet switching?

Looking at the volume of publications dealing with Optical Packet (OPS) and those dealing with Elastic Optical Networking (EON) in the period from 2000 to 2016, one clearly can observe that between 2004 and 2009 there is a boom of the OPS publications and then they start to diminish. At the same time, EON publications start to take-off (around 2011) and is steadily growing. EON is an emerging technology that may be considered as a killer technology in the sense that its performance, flexibility, associated cost, ease of deployment and marketing seem to be displacing OPS from the optical networking arena. The purpose of this paper is discuss if, effectively, EON is the killer technology of OPS. So then, besides review the EON technology, the paper analyzes its actual deployment possibilities.Peer ReviewedPostprint (author's final draft

Verification of performance degradation in a telecommunications system due to the uncertainty of human users in the loop

The intensive use of new technologies that cause more interactions between systems and the daily activities of human users is changing the focus on how network re- sources should be managed. However, these changes can create challenges related to the level of uncertainty that people introduce to the system. In this context, this research study seeks to determine whether people’s uncertainty influences network performance and how significant its impact is. For these purposes, a simulated case study of a Vehicle for Hire application designed to run over a network slicing of a fifth-generation (5G) network. The simulations compared call drop rates in several settings configured to represent different levels of uncertainty, introducing random alterations to free channel planning reserved for the handover process. The simulation results reveal that the uncertainty specifically introduced by people exerts a high negative impact on network performance, evidencing the need to develop an algorithm that considers this uncertainty when managing resources within the 5G network core.This work has been supported by the Spanish Government through project TRAINER-A (PID2020-118011GB-C21) with FEDER contribution. Moreover, it has been supported by the Spanish Thematic Network under contract RED2018-102585-T (Go2Edge) and by the aid granted by the Sinfoni project INV2733 of the Cooperative University of Colombia.Peer ReviewedPostprint (published version

Guidelines to SLA modeling and establishment in heterogeneous communications networks

© 2019 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other uses, in any current or future media, including reprinting/republishing this material for advertising or promotional purposes,creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other works.The question of how to specify, provide and measure service quality for network end-users has been of utmost interest for service and network infrastructure providers and their clients as well. The Service Level Agreement (SLA) is a beneficial tool in formalizing the interrelationships resulting from a negotiation among all participating actors with the target of achieving a common comprehension concerning delivery of services, its priorities, quality, responsibilities, and other relevant parameters. A horizontal SLA is an agreement between two service-providers existing at the same architectural layer (as for example two Internet Protocol (IP) or two Optical Transport Network (OTN) domains). A vertical SLA is an agreement between two individual providers at two different architectural layers (for instance, between an optical network and the core MPLS network). A service has to be defined without ambiguity utilizing Service Level Specifications (SLS) and three information types must be described: i) The QoX metrics as well as their corresponding thresholds; ii) A method of service performance measurement; iii) Service schedule. In this work we present preliminary simulation results that enable the development of a generic methodology for SLA modeling and establishment that will lead to a win-win situation for all involved actors. As an example, we put special attention in the benefits obtained by Optical Networks operators.Peer ReviewedPostprint (author's final draft

Service Level Agreements for Communication Networks: A Survey

Abstract. Information and Communication Technology (ICT) is being provided to the variety of endusers demands, thereby providing a better and improved management of services is crucial. Therefore, Service Level Agreements (SLAs) are essential and play a key role to manage the provided services among the network entities. This survey identifies the state of the art covering concepts, approaches and open problems of the SLAs establishment, deployment and management. This paper is organised in a way that the reader can access a variety of proposed SLA methods and models addressed and provides an overview of the SLA actors and elements. It also describes SLAs’ characteristics and objectives. SLAs’ existing methodologies are explained and categorised followed by the Service Quality Categories (SQD) and Quality-Based Service Descriptions (QSD). SLA modelling and architectures are discussed, and open research problems and future research directions are introduced. The establishment of a reliable, safe and QoE-aware computer networking needs a group of services that goes beyond pure networking services. Therefore, within the paper this broader set of services are taken into consideration and for each Service Level Objective (SLO) the related services domains will be indicated. The purpose of this survey is to identify existing research gaps in utilising SLA elements to develop a generic methodology, considering all quality parameters beyond the Quality of Service (QoS) and what must or can be taken into account to define, establish and deploy an SLA. This study is still an active research on how to specify and develop an SLA to achieve the win-win agreements among all actors.Peer ReviewedPostprint (published version