IMS is recognized as a unified system architecture for solving FMC. The implementation of IPTV system architecture can be based on a variety of network technologies, of which the implementation based on unified IMS is a current research hotspot. Evolution of IPTV IPTV is a multimedia service that is carried on the basis of an IP network and can provide services such as TV, video, voice, text, image, and data. At present, due to the rapid development of IPTV applications, IPTV provides a very good business development path for the telecommunications industry. The industry generally recognizes that IPTV can be closely integrated with the telecommunications network, and ultimately establishes a controllable, manageable, and operational IPTV system. The architecture can also provide carrier-grade service quality, user experience, security, interactivity and reliability. At present, important telecommunications standards organizations are actively researching IPTV solutions, hoping to meet the integration needs of services, networks and other aspects. Among them, the research on the IMS-based IPTV system architecture has a lot of room for development. The goal of the research is based on On top of IMS, build a converged IPTV system architecture. The foundation of the integration of IMS and IPTV As an important milestone on the development path of the next generation network, IMS has the foundation for integration with IPTV in many aspects, such as development direction, business requirements, basic bearer network, operator and user requirements, etc. It is feasible to build a converged IPTV system architecture. Have the same business requirements and development direction The IMS network meets the business requirements of the next generation network, that is, it hopes to gradually provide users with multimedia services, streaming media services, and information service services. Traditional IPTV mainly provides TV services, but with its rapid development, it hopes to provide them gradually. More value-added services, such as multimedia services, broadband Internet services, etc., and these services are exactly what is needed for the development and application of IMS networks. For these same business requirements, considering the combination of IMS and IPTV is the best way to achieve these business requirements and achieve a consistent development direction. Consistent requirements for bearer network Although the IP switching network has some inherent defects such as quality of service, it still sees many benefits brought by the use of the IP switching network in the development and evolution of the next generation network, and ultimately chooses the IP switching network as its carrier network. The deployment of the IMS bearer network meets the requirements of the next generation network for the bearer network, that is, the IMS bearer network is still based on IP. IPTV is itself a business application built on the IP network, so it uses the same IP bearer The network provides a good physical basis for the integration of IMS networks and IPTV. Operator and user requirements For the evolution research and later practice of the IPTV system architecture, the operator very much hopes to eventually establish a converged network that can be managed, controlled, and maintained, and can provide users with a variety of broadband services. Telecommunications users will also change the experience of various telecom services in the past, and will gradually be satisfied with the use of new services such as unified business acceptance, unified business experience, and unified business billing. From the above analysis, we can see that IMS and IPTV already have the foundation for the fusion in the above aspects. The IPTV system architecture finally established is a fusion system architecture that meets the needs of multiple parties such as services and networks. Research progress of IPTV system architecture based on IMS At present, ITU and TISPAN, two major standards organizations in the telecommunications field, are actively researching the IMS-based IPTV system architecture to provide standards support for the early completion of the integrated IPTV system architecture. ITU FG IPTV IMS-based IPTV system architecture ITU FG IPTV is currently formulating relevant standards for IMS-based IPTV. The IMS-based IPTV system architecture studied by ITU FG IPTV uses the NACF (Network Attachment Control Function) and RACF (Network Attachment Control Function) defined in its next-generation network in the network control part. Resource admission control function) The two subsystems will also use the IMS core network and related entities such as SUP-FE to provide a system architecture for IPTV application services. ITU FG IPTV reused the functional entities and system architecture of its researched IMS, and added the functional entities required to provide application services with IPTV. Related IPTV functional entities The functional entities specific to IPTV appearing in the IMS-based IPTV system architecture for ITU FG IPTV research are introduced as follows: Session user function entity (SC-FE Session Client FuncTIon EnTIty) will identify and prepare to connect with the content distribution function, and will communicate with the IPTV application through the IMS core. For example, the video-on-demand class will request the appropriate content distribution and storage function according to business needs. In the live broadcast service, the network parameters of the live broadcast application are requested, and responses are obtained in the above two situations. SC-FE also provides the function of processing service requests during the SIP session. In the system architecture shown in Figure 1, the IMS core functional entity replaces the IPTV service control function, will provide SIP-based session control mechanism and authentication and authorization based on IPTV application service user subscription information, and interact with RACS for resources Reserved. The core IMS provides interactive functions for IPTV terminal functions during the SIP session, and between IPTV applications and content distribution functions. The core IMS can be used for service discovery, and such as charging and roaming are also supported. The business user list functional entity (SUP-FEService User ProfileFuncTIon Entity) can be used to store the user list, user-related location information, and business layer status data. It will perform basic data management and maintenance functions and be responsible for responding to queries on user lists. IPTV service application The system will provide IPTV services for discovery and selection of applications, and these operations can be performed from multiple service providers. The service discovery generates and provides service discovery information to the IPTV terminal, and the service discovery information includes one or more interface points (eg, URL) to the service selection application. The service selection will generate and provide information descriptions of available services including live broadcast and on-demand for the convenience of user browsing and selection. The system will perform business logic for session management, business authorization, metadata content presentation and on-demand, and business logic for session management, business authorization, metadata content presentation and live broadcast. The system will also provide the distribution and presentation of additional IPTV services and content, such as games and distance learning. After interacting with the service user list to obtain the user's service list, all services will support the personalized service of the IPTV service. ETSI TISPAN IPTV system architecture based on IMS The R1 phase of ETSI TISPAN's research on the architecture of IMS will be directly based on the IMS system architecture defined by 3GPP version 7, and relevant improvements will be made for fixed special requirements. The research on the IMS-based IPTV system architecture will be based on The research results of IMS Release 1 include the existing NASS and RACS subsystems, and appropriately add network function entities related to IPTV to achieve the expansion of IPTV services. ETSI TISPAN reused the functional entity and system architecture of IMS researched in Release 1 and added the functional entities required to provide application services with IPTV. 　
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