UPCommons - E-prints UPC Universitat Politècnica de Catalunya
(63.328 recursos)
E-prints UPC cobreix dues finalitats: per una banda, és el dipòsit institucional de la UPC que recull els articles de revista, les comunicacions de congrés i els reports de recerca generats en les activitats de recerca del personal docent i investigador de la universitat; per l'altra, és una eina que permet accelerar la producció científica, allotjant versions de documents prèvies a la publicació en una revista o a les actes d’un congrés.
Ponències/Comunicacions de congressos
Mostrando recursos 1 - 18 de 18
1.
Optimized path selection in a game-theoretic routing protocol for video-streaming services over MANETs - Mezher, Ahmad; Tripp Barba, Carolina; Urquiza Aguiar, Luis; Aguilar Igartua, Mónica; Martín Faus, Isabel Victoria; Cruz Llopis, Luis Javier de la; Sanvicente Gargallo, Emilio
Mobile ad hoc networks (MANETs) are infrastructureless
networks formed by wireless mobile devices. Recently,
the demand over multimedia services such as video streaming
has increased specially since the number of mobile end users is
growing as well. MPEG-2 VBR is one of the most fitting video
coding techniques for MANETs which improves the distribution
of video streams specially when it is used with a proper multipath
routing scheme. In this article, we aimed to design a routing
scheme to dynamically select the forwarding paths using a
game-theoretic approach over a multipath routing protocol. Our
proposal seeks to describe an equation of the probability p of
sending video frames through the best...
2.
Autonomic resource management in virtual network - Mijumbi, Rashid; Gorricho Moreno, Juan Luis; Serrat Fernández, Juan
Virtualization enables the building of multiple virtual networks over a shared substrate. One of the challenges to virtualisation is efficient resource allocation. This problem has been found to be NP hard. Therefore, most approaches to it have not only proposed static solutions, but have also made many assumptions to simplify it. In this paper, we propose a distributed, autonomic and artificial intelligence based solution to resource allocation. Our aim is to obtain self-configuring, self-optimizing, self-healing and context aware virtual networks
4.
A price based load balancing scheme for multi-operator wireless access networks - Choque, Johnny; Agüero, Ramon; Serrat Fernández, Juan; Muñoz, Luis
We study a load balancing strategy, based on the price offered
by the base stations to the end-users who are willing to establish a
connection. The proposed scheme is compared with a pure load balancing
procedure, in a scenario comprising two different operators.We study the
impact of modifying the price offered by the base stations, in terms of
the achieved load balancing, as well as considering the revenue obtained
by the operators. Furthermore, we also enhance the two former access selection
schemes, by incorporating the willingness of reducing the number
of handovers, so as to analyze the impact over this particular parameter,
and over all the previous results. The...
5.
On the equilibrium of pricing assignment for heterogeneous wireless access networks - López, Carmen; Choque, Johnny; Agüero, Ramon; Serrat Fernández, Juan; Muñoz, Luis
Next generation networks and service providers are rapidly
evolving in order to satisfy the demands of an increasing number of users.
Nowadays, one of the most relevant research lines in the Heterogeneous
Wireless Access Networks realm is the use of procedures and mechanisms
so as to provide intelligence to the network, with the main goal of
optimizing its performance. Furthermore, mobile communication users
are becoming more demanding, and thus it becomes essential for the
providers to be able to offer a competitive value for money. This paper
pursues the objective of obtaining, from an analytical perspective, the
optimum price assignment strategy according to the characteristics of a
particular scenario, analyzing...
6.
Policy-assisted planning and deployment of virtual networks - Davy, Steven; Serrat Fernández, Juan; Astorga Rivera, José Antonio; Jennings, Brendan; Rubio-Loyola, J.
We present an approach for deploying and subsequently managing a virtual network overlay, which is tailored to an end-user’s request. Our approach combines a binary integer optimisation process to decide on the number and placement of virtual routers, and an autonomic network management system
that subsequently manages the configuration of the running virtual network. High-level optimisation policies are used to guide
the optimisation process to identify a virtual network that favours lower hosting costs or higher network quality (we use mean
delays as a quality metric). Low-level deployment policies are generated and used to govern the deployment and management
of the virtual networks. Our...
7.
Policy-based pricing for heterogeneous wireless access networks - Baliosian, Javier; Serrat Fernández, Juan; Richart, Matias; Saavedra, Juan; Borba, Mariela; Melus Moreno, José Luis
Our cities are already covered by a myriad of diverse wireless access networks. The most ubiquitous access networks are the well organized homogeneous and centralized operator-based cellular networks
that sustain their business model on a captive client basis. However, a
new billing paradigm is rising, where a client can choose to connect to the
provider that best comply with his/her current requirements and context.
Inside this paradigm, this paper presents a distributed, rule-based pricing strategy aimed to improve the quality of service and to increase the global income of a service provider. The performance and reliability
of the rule-based decisions is supported by a Finite...
8.
Gestión de políticas y precios en entornos de acceso heterogéneos - Baliosian, Javier; Rubio-Loyola, J.; Agüero, Ramon; Serrat Fernández, Juan
La irrupción de nuevos servicios, y el imparable aumento del número de tecnologías de acceso a disposición de los usuarios, hace que los diferentes actores involucrados en el ámbito de las comunicaciones tengan que replantearse sus estrategias tradicionales. Es necesario afrontar el diseño de una arquitectura capaz de asumir los retos que van apareciendo, siendo clave romper con algunas de las soluciones tradicionales, que no son capaces de responder a las nuevas exigencias que aparecen. Uno de los aspectos más importantes es afrontar el diseño desde un punto de vista global, haciendo que las diferentes entidades cooperen entre sí de...
9.
Alternatives for indoor location estimation on uncoordinated environments - Gorricho Moreno, Juan Luis; Cotrina Navau, Josep
Approaches based on signal-strength measurements are at present the most popular on indoor location due to their reasonable accuracy and cost effective deployment.
In this paper, we present an outlook of our research on different alternatives to implement an indoor location approach
based on signal-strength measurements for an uncoordinated environment, an environment where we do not have any control on the number of access points, their location, availability or transmitted power.
10.
Platforms and software systems for an autonomic internet - de Meer, H.; Paler, A.; Fischer, A.; Mornard, O.; Lefevre, L.; Rubio Loyola, Javier; Astorga Rivera, José Antonio; Serrat Fernández, Juan; Chai, W.K.; Mamatas, L.; Galis, A.; Clayman, S.; Cheniour, A.
The current Internet does not enable easy introduction and deployment of new network technologies and services. This paper aims to progress the Future Internet (FI) by introduction of a service composition and execution environment that re-use existing components of access and core networks. This paper presents essential service-centric platforms and software systems that have been developed with the aim to create a flexible environment for an Autonomic Internet.
11.
Evaluación de prestaciones de RSVP extendido para un escenario con garantías de distribución - Postigo Boix, Marcos; Melus Moreno, José Luis
In some guaranteed data delivery scenarios, servers can quickly and carefully allocate the available bandwidth among the requests of the users to reduce rejections. This is
particularly important when reservations are higher than minimum required delivery rate (semi-elastic reservations). As an example, when semi-elastic reservations utilize all the available server bandwidth and a new flow reservation arrives, it is useful to reallocate current reservations to accept the new one. The RSVP protocol is receiver oriented and it is in charge of setting up these reservations. However, in some cases, to reallocate bandwidth in a receiver riented way could delay the required...
12.
Estrategia de búsqueda de dispositivos basada en el historial de conexiones utilizando redes neuronales - Abad Padilla, José Alfredo; Gorricho Moreno, Juan Luis
La movilidad es una de las principales
características de las redes de comunicación actuales y produce cambios en su estructura, que en muchas ocasiones no son advertidos por la totalidad de los dispositivos que la conforman, principalmente por la distancia entre los dispositivos y el rango de transmisión. Por ello, la comunicación entre dos dispositivos se convierte en un problema de enrutamiento, el cual se define como la búsqueda de trayectorias mediante una adecuada estrategia. Para abordar esta situación, planteamos una estrategia de
búsqueda basada en el historial de onexiones del dispositivo móvil. Por naturaleza, una persona tiende a exhibir comportamientos repetitivos,...
13.
Surveillance with alert management system using conventional cell phones - Gorricho Moreno, Juan Luis; Brezmes, Tomas; Cotrina Navau, Josep; Rersa, Marc
In the present paper we expose the development of
a real-time monitoring prototype of human activities using a
single cell phone equipped with some sensors. The monitoring
system is reduced to the minimum expression; no special
hardware is required as far as a conventional cell phone will
monitor the user, classify the user activities with respect to a
customized rule’s set, and finally trigger the corresponding
alerts, when necessary.
14.
Técnicas de evaluación de la calidad en la Imagen. Tendencias y métricas basadas en bordes - Silvestre, Javier; Gorricho Moreno, Juan Luis
En los últimos años se ha dado un increment o exponencial en el uso y desarrollo de todo tipo de aplicaciones multimedia, como la videovigilancia, los sistemas de visión industriales o los sistemas de telediagnóstico y análisis de imagen médica. En este tipo de aplicaciones el elemento de entrada al sistema es la imagen. La calidad de la imagen de entrada puede influir en el comportamiento del sistema, haciendo necesario conocer la calidad de la imagen de entrada y acotar los límites de degradación que las aplicaciones pueden tolerar. En este trabajo se analizan algunas de las técnicas más recientes,...
15.
Business-driven management of differentiated services - Rubio Loyola, Javier; Serrat Fernández, Juan; Charalambides, Marinos; Aib, Issam; Pavlou, George; Boutaba, Raouf
Several intra- and inter-domain quality of service
(QoS) provisioning mechanisms for IP networks have been
researched and developed using Differentiated Services
(DiffServ) technology. However, the incremental efforts needed to
manage DiffServ networks from a business-oriented viewpoint
have received relatively little attention. This paper addresses this
gap and presents a framework for achieving business-driven QoS
provisioning in DiffServ over MPLS networks. We provide a rich
model of SLA and business indicators as well as reasonable
mapping functions that define, with key degrees of importance,
the impact of business indicators over service management
policies. Business and service indicators are used to control static
and dynamic admission of services. The paper advances the state
of the...
16.
Activity monitoring of employees working on large premises - Gorricho Moreno, Juan Luis; Sempere-Payá, Víctor-M.; Silvestre, Javier
In this paper we expose our present work on a
real-time monitoring system of human activities,
using only a single cell phone equipped with some
particular sensors. This way the monitoring
system is reduced to the minimum expression, no
especial hardware is required as far as a
conventional cell phone will monitor the user. In
particular, we expose our progress on a
monitoring system devoted to supervising
employee’s work on large premises, detecting
abnormal behaviours, hazardous situations and
managing the corresponding alert procedures.
17.
User activity monitoring using conventional cell phones - Brezmes, Tomas; Gorricho Moreno, Juan Luis; Cotrina Navau, Josep; Rersa, Marc
User activity monitoring has a considerable potential for a whole range of new applications in different environments: user surveillance, military purposes, health-care, etc. More precisely, in health-care there is an implicit potential application monitoring elderly people or patients suffering an illness. Besides, nowadays our society is more than ever exposed to an aging population, which is one of the main concerns of present administrations. Any technical approach alleviating the ever increasing health-care budget will be welcomed.
Thankfully, recent progress in communication technologies and sensor miniaturization has opened the door to new approaches overcoming the above mentioned situation, involving, for example, remote...
18.
Monitoring of a virtual infrastructure testbed - Magana, Edgar; Astorga Rivera, José Antonio; Serrat Fernández, Juan; Valle Alarcón, Rafael
This paper presents a SNMP-based Monitoring Agents
for Multi-Constrain Resource Scheduling in Grids
(SBLOMARS) as an effective solution for resource usage
monitoring in virtual network environments. SBLOMARS is
different to current large-scale distributed monitoring systems in
three essential aspects: Firstly, it reaches a high level of
generality by the integration of the SNMP protocol and thus,
facilitates to handle heterogeneous operating platforms.
Secondly, it is able to self-configure the polling periods of the
resources to be monitored depending of network context and
finally, it makes use of dynamic software structures to interface
with third parties, allowing to be deployed in a wide range of
devices, from simple mobile access devices to robust
multiprocessor...
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