Publication: Propuesta de arquitectura de QoS en entorno inalámbrico 802.11e basado en Diffserv con ajuste dinámico de parámetros
Loading...
Identifiers
Publication date
2006-06
Defense date
2006-07-20
Authors
Advisors
Tutors
Journal Title
Journal ISSN
Volume Title
Publisher
Impact
Export
Abstract
Durante los últimos años hemos sido testigos de la eclosión de las redes inalámbricas,
las cuales han facilitado la interconexión de equipos proporcionando una movilidad y
flexibilidad en el acceso a Internet hasta la fecha impensables. La difusión de este tipo de redes en España ha venido acompañada de los accesos de banda ancha, de forma que nos resulta bastante natural disponer de un equipo inalámbrico para el acceso a Internet desde nuestros hogares.
Ambos avances han permitido el desarrollo de multitud de servicios multimedia, los
cuales, hasta la fecha, no se habían desplegado debido a las limitaciones tecnológicas en el
acceso. De esta forma, cada día resulta más común el poder acceder a un mapa de la zona donde nos encontramos, localizar la gasolinera más próxima, consultar la cartelera de cine o establecer una videoconferencia con un familiar.
Por desgracia, estos avances tecnológicos no han venido acompañados de algún
mecanismo que nos asegure un adecuado acceso a estos servicios, es decir, un soporte de
Calidad de Servicio (QoS por sus siglas en inglés). De hecho, seguimos disfrutando de un nivel similar al que teníamos hace bastantes años, aunque ahora dispongamos de una mayor velocidad de acceso.
En el caso de las tecnologías inalámbricas, caracterizadas por su extrema dependencia
de las condiciones del entorno y su baja eficiencia en escenarios con múltiples dispositivos
móviles, el soporte de calidad de servicio cobra un especial interés. En la búsqueda de una
solución para estos entornos, en esta tesis, se propone una arquitectura de red de acceso que ofrece un soporte de calidad de servicio al mismo tiempo que permite una gestión óptima de los recursos de red.
Con respecto a la gestión de la calidad de servicio, se ha optado por el modelo de
servicios diferenciados, el cual se ajusta a las especiales características de las redes
inalámbricas. Y en relación a estas últimas, se decidió trabajar sobre el estándar de mayor
difusión, 802.11, de forma que los resultados obtenidos en esta tesis pudiesen ser fácilmente
aplicables a redes reales.
De esta forma, apoyándonos en la norma desarrollada por el grupo de trabajo IEEE
802.11e, proponemos una arquitectura de red de acceso con soporte de calidad de servicio
basado en el modelo de servicios diferenciados para dispositivos móviles 802.11e.
La arquitectura permite, apoyándose en las herramientas proporcionadas por 802.11e,
maximizar el rendimiento de la red de acceso ajustando de forma dinámica los parámetros de acceso de cada cliente en base a la carga de red.
La propuesta es finalmente validada mediante el empleo de la técnica de simulación
sobre distintos escenarios de interés, a través de los cuales se constata la mejora del rendimiento planteada y, además, se ofrecen criterios de diseño para su aplicación.
During the last years we have witnessed a wide spread of wireless networks, which have meant an easier way for network connectivity, by providing flexibility and mobility in the Internet access. The diffusion of this kind of networks in Spain has been accompanied by the development of wide band access, in such a way that it is common to find wireless equipments to Internet access at home. Both advances have allowed the development of multiple multimedia services, which have not been implemented so far because of the technological limitations in the access. Therefore, it is increasingly common the fact of getting access to a map, finding a gas station, checking the billboard or establishing a videoconference with a colleague. Unfortunately, these technological advances have not been accompanied by any mechanism that ensures a proper access to such services, that is to say ‘Quality of Service (QoS) support’. In fact, although we now enjoy a higher bandwidth, we still have the same QoS support we have had for many years. The QoS support is especially interesting with wireless technologies. These networks are extremely dependent on the access conditions. In this thesis, seeking for a solution in these environments, we propose an access network architecture that provides QoS support, as well as an optimal management of the network resources. Regarding the QoS management, the Differentiated Service Model has been chosen for its suitability to the special conditions of wireless networks. On the other hand, regarding the mentioned wireless networks, we have decided to make use of the worldwide most popular standard, 802.11, so that the results of the thesis can be easily implemented in real networks. Thus, our analysis is based on the work developed by the working group IEEE 802.11e, and we propose an access network architecture with QoS support using the differentiated service model for 802.11e mobile nodes. The architecture determines the appropriate configuration in order to maximize the network performance in a dynamic way, by adjusting the access network parameters based on the network load. The proposal is validated using simulation techniques in different environments, where the proposal improvements are put forward and design criterias for its implementation are defined.
During the last years we have witnessed a wide spread of wireless networks, which have meant an easier way for network connectivity, by providing flexibility and mobility in the Internet access. The diffusion of this kind of networks in Spain has been accompanied by the development of wide band access, in such a way that it is common to find wireless equipments to Internet access at home. Both advances have allowed the development of multiple multimedia services, which have not been implemented so far because of the technological limitations in the access. Therefore, it is increasingly common the fact of getting access to a map, finding a gas station, checking the billboard or establishing a videoconference with a colleague. Unfortunately, these technological advances have not been accompanied by any mechanism that ensures a proper access to such services, that is to say ‘Quality of Service (QoS) support’. In fact, although we now enjoy a higher bandwidth, we still have the same QoS support we have had for many years. The QoS support is especially interesting with wireless technologies. These networks are extremely dependent on the access conditions. In this thesis, seeking for a solution in these environments, we propose an access network architecture that provides QoS support, as well as an optimal management of the network resources. Regarding the QoS management, the Differentiated Service Model has been chosen for its suitability to the special conditions of wireless networks. On the other hand, regarding the mentioned wireless networks, we have decided to make use of the worldwide most popular standard, 802.11, so that the results of the thesis can be easily implemented in real networks. Thus, our analysis is based on the work developed by the working group IEEE 802.11e, and we propose an access network architecture with QoS support using the differentiated service model for 802.11e mobile nodes. The architecture determines the appropriate configuration in order to maximize the network performance in a dynamic way, by adjusting the access network parameters based on the network load. The proposal is validated using simulation techniques in different environments, where the proposal improvements are put forward and design criterias for its implementation are defined.
Description
Keywords
Arquitectura de redes, Arquitectura de redes, Redes inalámbricas, QoS, IEEE 802.11e