http://hdl.handle.net/2117/3889 2013-06-20T00:08:26Z http://hdl.handle.net/2117/17057 Title: On the equilibrium of pricing assignment for heterogeneous wireless access networks Authors: López, Carmen; Choque, Johnny; Agüero, Ramon; Serrat Fernández, Juan; Muñoz, Luis Abstract: 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 the improvement attained with such optimum pricing policy as compared to a more traditional one. Game theory techniques, which are gathering the interest within the communications scientific community, are used for the analysis. 2012-11-30T13:33:47Z http://hdl.handle.net/2117/17055 Title: A price based load balancing scheme for multi-operator wireless access networks Authors: Choque, Johnny; Agüero, Ramon; Serrat Fernández, Juan; Muñoz, Luis Abstract: 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 whole work is conducted over a proprietary event-based simulation tool, which offers the required degree of flexibility and low computational overhead. 2012-11-30T11:54:36Z http://hdl.handle.net/2117/16125 Title: Policy-assisted planning and deployment of virtual networks Authors: Davy, Steven; Serrat Fernández, Juan; Astorga Rivera, José Antonio; Jennings, Brendan; Rubio-Loyola, J. Abstract: 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 results indicate that the binary integer optimisation process produces a virtual network that has lower cost as compared to creating a network based on combined shortest paths. 2012-06-22T14:34:16Z http://hdl.handle.net/2117/16098 Title: Gestión de políticas y precios en entornos de acceso heterogéneos Authors: Baliosian, Javier; Rubio-Loyola, J.; Agüero, Ramon; Serrat Fernández, Juan Abstract: 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 manera abierta y flexible, lo que no es posible (en muchas ocasiones) con parches a las alternativas que actualmente existen. Este marco es en el que se sitúa el proyecto Comunicaciones Cognitivas, Cooperativas y Gestión Autónoma de Servicios (C3SEM), que se fundamenta en la cooperación e integración del substrato de comunicación subyacente con la arquitectura de gestión de servicios. En este trabajo se plantea una de las líneas de trabajo actuales, en la que se analiza diferentes políticas de gestión de precios, ya que parece razonable que en el medio plazo los operadores se vean obligados a redefinir sus estrategias actuales, principalmente basadas en tarifas planas. 2012-06-18T17:19:10Z http://hdl.handle.net/2117/16097 Title: Policy-based pricing for heterogeneous wireless access networks Authors: Baliosian, Javier; Serrat Fernández, Juan; Richart, Matias; Saavedra, Juan; Borba, Mariela; Melus Moreno, José Luis Abstract: 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 State Transducersbased inference machine specially designed to manage networking systems. We show, with simulations, that, using our strategy, the operators can make the new billing paradigm profitable while the clients benefit from the economic advantages of competition and of the quality given by a pricing–based network balance mechanism. 2012-06-18T17:15:30Z http://hdl.handle.net/2117/13367 Title: Alternatives for indoor location estimation on uncoordinated environments Authors: Gorricho Moreno, Juan Luis; Cotrina Navau, Josep Abstract: 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. 2011-09-27T18:29:42Z http://hdl.handle.net/2117/11851 Title: Platforms and software systems for an autonomic internet Authors: 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. Abstract: 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. 2011-03-15T12:41:21Z http://hdl.handle.net/2117/11299 Title: Evaluación de prestaciones de RSVP extendido para un escenario con garantías de distribución Authors: Postigo Boix, Marcos; Melus Moreno, José Luis Abstract: 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 sender reservation adjustments. This paper presents a new extension of the RSVP signaling messages that allows the server to adjust and modify these reservations. The performance evaluation of the extended and the native RSVP signaling protocols when used to manage the access bandwidth of a semi elastic flows server shows the benefits of the extensions. In particular, the use of resource reservation is reduced because of a more efficient bandwidth usage. In addition, the blocking probability is also reduced because of a more flexible bandwidth reallocation situation. The authors believe that this procedure is an intermediate step to improve the lack of flexibility that RSVP presents. 2011-02-07T18:11:11Z http://hdl.handle.net/2117/11285 Title: Estrategia de búsqueda de dispositivos basada en el historial de conexiones utilizando redes neuronales Authors: Abad Padilla, José Alfredo; Gorricho Moreno, Juan Luis Abstract: 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, por lo que, observando estos patrones conductuales podremos, con cierta certeza, ubicarlo en un espacio y tiempo específico. Tomando en consideración lo anterior, si utilizamos el historial de conexiones de un dispositivo y mediante las apropiadas herramientas stocásticas, se podría lograr una visión de la estructura de la red y de esta forma predecir la secuencia de dispositivos que formarían la trayectoria para la omunicación entre dos dispositivos. Utilizaremos como herramienta de predicción de secuencias redes neuronales y analizaremos su contribución en el diseño de un algoritmo de búsqueda de dispositivos móviles. 2011-02-04T19:39:08Z http://hdl.handle.net/2117/10357 Title: Surveillance with alert management system using conventional cell phones Authors: Gorricho Moreno, Juan Luis; Brezmes, Tomas; Cotrina Navau, Josep; Rersa, Marc Abstract: 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. 2010-11-22T11:44:51Z http://hdl.handle.net/2117/9805 Title: Técnicas de evaluación de la calidad en la Imagen. Tendencias y métricas basadas en bordes Authors: Silvestre, Javier; Gorricho Moreno, Juan Luis Abstract: 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, basadas en la medición de las modificaciones estructurales más que en el clásico enfoque basado en el error. Sin embargo, estas técnicas también presentan sus limitaciones. En este trabajo se demuestra como las técnicas clásicas puede proporcionar también una buena correlación con el sistema visual humano, especialmente si el análisis se basa en la medición de las bordes de las imágenes más que en las propias imágenes. Esta técnica es sencilla de calcular y además es independiente de parámetros intrínsecos a la comparación de imágenes. 2010-10-19T10:57:49Z http://hdl.handle.net/2117/9499 Title: Business-driven management of differentiated services Authors: Rubio Loyola, Javier; Serrat Fernández, Juan; Charalambides, Marinos; Aib, Issam; Pavlou, George; Boutaba, Raouf Abstract: 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 art by considering the influence of business-level objectives on the policy refinement process. We evaluate and discuss the effectiveness of our approach through a simulation environment that we developed over OPNET. 2010-10-07T08:38:18Z http://hdl.handle.net/2117/8939 Title: Activity monitoring of employees working on large premises Authors: Gorricho Moreno, Juan Luis; Sempere-Payá, Víctor-M.; Silvestre, Javier Abstract: 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. 2010-09-17T08:33:15Z http://hdl.handle.net/2117/7837 Title: User activity monitoring using conventional cell phones Authors: Brezmes, Tomas; Gorricho Moreno, Juan Luis; Cotrina Navau, Josep; Rersa, Marc Abstract: 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 supervision of home-confined elderly people. In particular, a real-time monitoring system of human activities would be an interesting solution to supervise aged people or people deserving medical attention. In the present paper we expose the development of a real-time monitoring system of human activities using a single cell phone equipped with some 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, classify the user activities with respect to a customized rule’s set and finally trigger the corresponding alerts when necessary 2010-06-25T13:24:34Z http://hdl.handle.net/2117/6489 Title: Monitoring of a virtual infrastructure testbed Authors: Magana, Edgar; Astorga Rivera, José Antonio; Serrat Fernández, Juan; Valle Alarcón, Rafael Abstract: 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 systems or clusters with even multiple hard disks and storage partitions. SBLOMARS has been deployed in EmanicsLab, a virtual laboratory constituted by fourteen nodes distributed in seven European Universities. Although the research is not yet concluded, available results confirm its suitability to deal with the challenges of monitoring virtual networks. 2010-02-26T15:00:59Z