IPTV, which is short for Interactive Personality TV, is a brand-new technology that uses broadband networks to integrate Internet, multimedia, and communication technologies to provide home users with a variety of interactive services, including digital TV. It can adapt well to the rapid development of today’s networks and make full and effective use of network resources.
IPTV refers to video services that provide on-demand or multicast services to users on ip-based networks. IPTV is an important step in the evolution of TV media to network new media, and also a representative of the integration of three networks. Current and former iptv-related standardization organizations and BBS mainly include ITU, ISO, Internet streaming media alliance (ISMA), open mobile alliance (OMA), digital sound/video alliance (DAVIC), interactive television alliance (ITV), broadband service alliance, Tvanytime, IETF and ATM BBS in the early years.
At present, the standardization research on IPTV is in a critical period, and itu-t and ETSI TISPAN are both focused on. Itu-t FG IPTV, established in April 2006, ended its work in December 2007 after seven meetings. Due to the wide range of technologies involved in IPTV, itu-t also set up IPTV GSI to carry out overall coordination and promotion of IPTV among multiple SG, and IPTV requirements and architecture have been adopted at present. TISPAN research focus on the requirements and architecture of IPTV, has released the first version of the relevant standards, the second version of the relevant standardization work. For IPTV architecture, these two standards organizations have studied from two aspects, one is non-ngn-based IPTV architecture (non-ngn-based IPTV), the other is ngn-based IPTV architecture (ngn-based IPTV). For ngn-based IPTV architecture, it is divided into ims-based IPTV architecture (ims-based IPTV) and non-ims-based IPTV architecture (non-ims-based IPTV) according to whether or not the functions related to IMS are reused.
ITU – T support IPTV architecture y. (1901), four categories of business, including interactive business, entertainment, business, communications, business, business information, the proposed NGN IPTV architecture of high-level include end-user functions (EUF), application function (AF) and content delivery function (CDF), business control function (SCF), management (MF), content providers (CPF) and network functions (NF). Non-ims-based IPTV architecture makes use of two subsystems, NACF (network attachment control function) and RACF (resource admission control function), defined in NGN. In addition to using NACF and RACF defined in NGN in network control, ims-based IPTV architecture also USES IMS core network and related functional entities such as UPSF to provide service control functions of IPTV.
The IPTV architecture given by TISPAN is similar to itu-t. Most functional entities can map to each other. The differences mainly include: itu-t gives a detailed description of the content distribution function, the content and service protection function, and the content preprocessing function. On the end user side, itu-t is divided into ordinary IPTV terminal and family gateway functions, while TISPAN only regards the end side as the user terminal. The application layer function modules given by itu-t are more detailed; TISPAN defines iptv-related data in a more detailed and in-depth way, and TISPAN has published ims-based IPTV and non-ims-based IPTV interface standards.
IPTV technology is complex, involving various technologies of support layer, business layer, bearing layer and access layer, including audio and video coding and decoding technology, streaming technology, content distribution technology, multicast technology and DRM technology, as well as integration of various technologies. Planners should strengthen the man to adapt to IPTV service transformation, QoS technology application, multicast technology application, support system transformation requirements and other aspects of research.
IPTV represents the expansion of the new business field of IP entertainment video interaction. The business model, business positioning, business requirements and the final framework of IPTV continue to evolve, while the technical requirements of the carrier network are further clarified. Planners should closely track the progress of IPTV standards, focus on the development of IPTV architecture, the application of IMS technology and P2P technology, and study the relevant network construction schemes.