Publication: Configuración de transporte multicast IP con calidad de servicio en arquitecturas de red con plano de control IMS
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2008-04
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2008-06-11
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Abstract
El proceso de estandarización de la tecnología UMTS como estándar global 3G ha resultado en el desarrollo del Subsistema Multimedia IP (IP Multimedia Subsystem, IMS). IMS es una arquitectura de control, basada en el protocolo IP, que proporciona un conjunto de funcionalidades que resultan esenciales en la provisión de los servicios multimedia de valor añadido con requisitos de QoS que están previstos en el futuro de las redes móviles de tercera generación. Así, por un lado, IMS provee al usuario con medios para acceder a un amplio rango de servicios implementados mediante Servidores de Aplicación. Por otro lado, las funcionalidades de control de sesión en IMS permiten establecer sesiones multimedia entre Equipos de Usuario (User Equipment, UE), sobre las cuales es posible proporcionar nuevos servicios peer-to-peer basados en el intercambio directo de información entre las partes participantes en el servicio. En este contexto, muchos de los servicios que actualmente están siendo considerados en el futuro de las redes 3G son de naturaleza multiususario, en los que varios usuarios participan en la ejecución del servicio, de modo que la información debe ser intercambiada entre múltiples UEs. Ejemplos de tales servicios son el servicio de Conferencia o el servicio Push-to-talk. Por otro lado, el continuo desarrollo y despliegue de nuevos accesos de banda ancha, posibilita la entrega de nuevos servicios de valor añadido al usuario, lo que finalmente permite atraer la atención del usuario y sostener de este modo el continuo crecimiento de Internet. A este respecto, el desarrollo de especificaciones para una Red de Internet de Próxima Generación permitirá desarrollar nuevas infraestructuras con capacidades y características que soporten la apropiada provisión de los servicios multimedia del futuro sobre las distintas redes de acceso fijas y móviles disponibles. Así, entre las iniciativas más importantes en el campo de las Redes de Próxima Generación (Next Generation Network, NGN), adquiere especial relevancia la propuesta por el grupo TISPAN de ETSI, que trabaja en el desarrollo de especificaciones para una Red de Próxima Generación basada en IMS. Bajo las consideraciones presentadas, el principal objetivo de esta Tesis Doctoral ha consistido en el desarrollo de una plataforma general que, mediante la extensión de las funcionalidades de control de sesión presentes en IMS, soporte la provisión de servicios multiusuario en redes NGN con este plano de control. Asimismo, en la solución presentada, la eficiencia en el uso de los recursos de portadora se ha garantizado mediante el empleo de servicios de transporte multicast a nivel de red en la transmisión de la información de usuario. Por otro lado, se presentarán soluciones que permitan cubrir las carencias presentes en la primera versión de especificaciones de la NGN de TISPAN con respecto a los mecanismos de provisión de calidad de servicio. Finalmente, se realizará una validación de las soluciones presentadas mediante la implementación de las mismas. _____________________________________________
The standardization process of the UMTS technology as a 3G global standard, has resulted in the development of the IPMultimedia Subsystem (IMS). IMS is a control architecture, based on the IP protocol, that provides a set of functionalities that are essential in the provision of the value-added multimedia services with QoS requirements that are envisioned in the future of 3G mobile networks. On one hand, IMS provides the user with means to access a wide range of services, implemented by means of Application Servers. On the other hand, the session control functionalities in IMS allow to establish multimedia sessions between User Equipments (UEs), making possible to provide new peer-to-peer services based on the direct exchange of media between the parties that participate in the service. In this context, many of the services that are currently being considered in the future of 3G networks are multiparty in nature, where several users participate in the execution of the service, so that media is exchanged between multiple UEs. Examples of that services are the Conference service or the Push-to-talk service. On the other hand, the continuous development and deployment of new wideband access technologies enables the delivery of new value-added services to the user, which allows to appeal the user attention and to sustain the constant evolution of Internet. In this respect, the development of specifications for a Next Generation Internet network will introduce new infrastructures with features and capabilities to support the future multimedia services over the different fixed and mobile access networks. One of the most relevant initiatives in the field of Next Generation Networks (NGN), is the one proposed by the ETSI TISPAN group, that is currently working in the development of specifications for an IMS based Next Generation Network. Taking into account the previous considerations, the main objective of this PhD thesis has consisted of developing a generic platform that, by extending the IMS session control functionalities, supports the provision of multiparty services in NGN networks with this control plane. In addition, in the presented solution, the efficiency regarding the utilization of bearer resources has been assured by using network level multicast delivery services to transmit the media. On the other hand, solutions will be presented to cover the open issues in the first release of specifications of TISPAN NGN with respect to QoS provisioning. Finally, an experimental validation of the proposed solutions based on implementation will be presented.
The standardization process of the UMTS technology as a 3G global standard, has resulted in the development of the IPMultimedia Subsystem (IMS). IMS is a control architecture, based on the IP protocol, that provides a set of functionalities that are essential in the provision of the value-added multimedia services with QoS requirements that are envisioned in the future of 3G mobile networks. On one hand, IMS provides the user with means to access a wide range of services, implemented by means of Application Servers. On the other hand, the session control functionalities in IMS allow to establish multimedia sessions between User Equipments (UEs), making possible to provide new peer-to-peer services based on the direct exchange of media between the parties that participate in the service. In this context, many of the services that are currently being considered in the future of 3G networks are multiparty in nature, where several users participate in the execution of the service, so that media is exchanged between multiple UEs. Examples of that services are the Conference service or the Push-to-talk service. On the other hand, the continuous development and deployment of new wideband access technologies enables the delivery of new value-added services to the user, which allows to appeal the user attention and to sustain the constant evolution of Internet. In this respect, the development of specifications for a Next Generation Internet network will introduce new infrastructures with features and capabilities to support the future multimedia services over the different fixed and mobile access networks. One of the most relevant initiatives in the field of Next Generation Networks (NGN), is the one proposed by the ETSI TISPAN group, that is currently working in the development of specifications for an IMS based Next Generation Network. Taking into account the previous considerations, the main objective of this PhD thesis has consisted of developing a generic platform that, by extending the IMS session control functionalities, supports the provision of multiparty services in NGN networks with this control plane. In addition, in the presented solution, the efficiency regarding the utilization of bearer resources has been assured by using network level multicast delivery services to transmit the media. On the other hand, solutions will be presented to cover the open issues in the first release of specifications of TISPAN NGN with respect to QoS provisioning. Finally, an experimental validation of the proposed solutions based on implementation will be presented.
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Protocolos de comunicación, Arquitectura de redes, Multimedia