Publication: Desarrollo de una aplicación de audioconferencia basada en multicast para escenarios de red con soporte IMS
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2009-03
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2009
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Abstract
Hoy en día la demanda de nuevos servicios en las redes de telecomunicaciones está llevando a los operadores a buscar nuevas fórmulas para satisfacer las necesidades de sus clientes. Para ello los operadores están buscando unificar todos los servicios que ofrecen tanto las redes de telefonía fija, la red de telefonía móvil e Internet. En este marco aparecen las Redes de Nueva Generación (NGN) que se presentan como un tipo de redes cuya arquitectura permite la unificación de los tres dominios mencionados anteriormente y además permite la creación y acceso a nuevos servicios de valor añadido. Este tipo de redes aseguran la calidad de servicio extremo a extremo (QoS End-to-End) siendo capaces de soportar servicios en tiempo real como la transmisión de la voz sobre IP (VoIP) asegurando unos parámetros de latencia y jitter. Otro tipo de servicios sensibles al retardo y el jitter tales como el video sobre demanda (VoD) o la televisión sobre IP (IPTV) también están soportados en este tipo de redes. Dentro de las redes de nueva generación, el 3GPP (Third Generation Partnership Project) [19] propone una nueva arquitectura denominada subsistema multimedia IP (IP Multimedia Subsystem, en adelante IMS); mediante la producción de especificaciones y reportes técnicos. Gracias a esta arquitectura sería posible acceder a multitud de servicios, tanto servicios peer-to-peer como puede ser la transmisión de voz, como a los distintos servicios de valor añadido proporcionados por un proveedor, y por supuesto los anteriormente mencionados VoD y IPTV siguiendo en todos los casos procedimientos sencillos de control. El presente proyecto tiene como objetivo la implementación una aplicación que sea capaz de generar la señalización adecuada (basada en los protocolos SIP [5] y SDP [18]) para permitir el establecimiento de una sesión de voz multiusuario. Esta herramienta utiliza el soporte de un servidor de aplicación desarrollado para gestionar sesiones multiusuario [11, 12, 13]. Del mismo modo se trata la emisión y recepción de los paquetes de voz enviados por multidifusión [15, 16] a los participantes de la conversación. ____________________________________________
Nowadays, the demand of the new services in the telecommunications networks tends the operators to search for new formulas in order to satisfy the customer necessities. To carry out this, the operators are trying to merge all the services that the landline, mobile infrastructure and Internet can offer. In this framework, the New Generation Networks (NGN) provides the capabilities to merge the three domains mentioned and besides allows the creation and the access to a new added value services. This kind of networks ensure end to end quality of service (QoS end to end) and can support real time services such as the transmission of the voice over IP packets (VoIP) guarantying certain parameters as the latency and jitter. Other type of services very sensitive to these parameters such as the Video on Demand (VoD) and the television over IP (IPTV) are also supported in these networks. In the NGN framework, the 3GPP (Third Generation Partnership Project) [19] purposes a new architecture called IP Multimedia Subsystem (IMS) by means of delivering specifications and technical reports. With this architecture it is possible to access to many type of services, such as peer-to-peer with the voice over IP transmission, the new added value services provided by the operator or third party and of course the previous ones mentioned VoD and IPTV implementing in all the cases simple control mechanisms procedures. The goal of this project is the implementation of an application capable of generating the proper signalling (based on the protocols SIP [5] and SDP [18]) to permit the establishment of a multiparty voice conference. This tool utilizes the support from an application sever developed to handle multiparty sessions [11, 12, 13]. In addition, it is also studied the transmission and reception of the voice packets to a multicast IP address to all the participants of the session.
Nowadays, the demand of the new services in the telecommunications networks tends the operators to search for new formulas in order to satisfy the customer necessities. To carry out this, the operators are trying to merge all the services that the landline, mobile infrastructure and Internet can offer. In this framework, the New Generation Networks (NGN) provides the capabilities to merge the three domains mentioned and besides allows the creation and the access to a new added value services. This kind of networks ensure end to end quality of service (QoS end to end) and can support real time services such as the transmission of the voice over IP packets (VoIP) guarantying certain parameters as the latency and jitter. Other type of services very sensitive to these parameters such as the Video on Demand (VoD) and the television over IP (IPTV) are also supported in these networks. In the NGN framework, the 3GPP (Third Generation Partnership Project) [19] purposes a new architecture called IP Multimedia Subsystem (IMS) by means of delivering specifications and technical reports. With this architecture it is possible to access to many type of services, such as peer-to-peer with the voice over IP transmission, the new added value services provided by the operator or third party and of course the previous ones mentioned VoD and IPTV implementing in all the cases simple control mechanisms procedures. The goal of this project is the implementation of an application capable of generating the proper signalling (based on the protocols SIP [5] and SDP [18]) to permit the establishment of a multiparty voice conference. This tool utilizes the support from an application sever developed to handle multiparty sessions [11, 12, 13]. In addition, it is also studied the transmission and reception of the voice packets to a multicast IP address to all the participants of the session.
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Redes de comunicación, Arquitectura de redes, Protocolos de comunicación, Multimedia, VoIP