The development of the IPTV system system is inseparable from the development of network technology. The technical content of the IPTV system mainly includes video codec technology, digital rights management technology, VDN, EPG technology, streaming media technology, network multicast technology, etc. End-to-end solutions include head-end coding system, content business operation support system, STB terminal system, distributed streaming media service system, content processing system, digital rights management, integrated business management platform, EPG system, value-added business system and broadband network supporting equipment , Is by far the most complex business and involves the most connotation solutions. IPTV codec technology mainly includes MPEG2, MPEG4, H.264, AVS, etc. Among them, AVS is China's codec technology with independent intellectual property rights, and has become one of the international standard organization codec specifications. The successful application of IPTV solutions based on AVS helps to promote the healthy and healthy development of China's IPTV industry.
Based on the broadband network, IPTV provides a variety of multimedia video services to TV, PC, mobile terminals and other users. It is the best tool for operators to integrate "triple network integration", develop Triplay services, and transform into an integrated information service provider. Has good development prospects. IPTV's business types are very rich, including video services, communication services, information services, entertainment games, etc. In terms of specific business forms, including live broadcast, on-demand, time-shift TV, recording and broadcasting, carousel, karaoke, video communication, information services , Financial securities, interactive TV, e-commerce, distance education, etc., is a new broadband entertainment value-added business, with a wealth of potential customers.
AVS headend coding system
The head-end system is mainly AVS encoder, which is divided into real-time encoder and offline encoder.
Real-time encoder: Transcode the video signal of the live channel into the AVS encoding format in real time, and convert the digital audio and video IP network packets to the user for playback. According to the current domestic IPTV operation mode, the content providers (such as CCTV, Wenguang, etc.) directly provide the AVS program source of the live channel.
Offline encoder: Pre-encode VOD on-demand programs into AVS encoding format and save them in VOD video on-demand server for users to perform on-demand.
business system
The business system mainly includes a content operation platform, a business operation platform and a VDN content distribution platform, which realizes the release, management, classification and distribution of AVS encoded content.
Content Business Operation System
The content service operation system is mainly an operation platform provided to AVS content providers and IPTV service operators. It also manages IPTV users, content provision interfaces, service provision interfaces, and EPG, etc., to implement authentication, content charging, etc., and To achieve interoperability with OSS / BSS systems, etc., to complete the operation and management of IPTV services.
The ATV-based IPTV service operation includes two parts. The first part provides CP / SP unified access interface, user equipment management, content unified management, business unified development and management, OSS / BSS unified access and other functions. Among them, the CP / SP access module facilitates operators to introduce and manage multiple AVS content providers. Unified content management provides content source related information to achieve unified management of content. The unified development and management of services provides a unified interface to facilitate the development and introduction of multiple services anytime, anywhere. The second part provides access to the business operation systems of multiple manufacturers.
VDN business network
Compared with various data services in the past, IPTV has a high occupation of network bandwidth and high requirements on network quality. Various types of streaming media files are used in IPTV systems. To ensure service quality and user experience, VDN streaming media files are widely used Distribution technology is a relatively complete solution at this stage. The basic principle of a business network is to push business content, such as video and audio program content, to the edge of the network using VDN technology to provide services to users nearby, thereby effectively improving service quality and reducing transmission pressure on the backbone network. At the same time, the problem of scalability is effectively solved by flexibly configuring the edge video server. The core technology of the business network is the content service distribution mechanism. The VDN service network is mainly composed of distributed streaming media systems, service distribution scheduling strategies, etc. It is the most important part of the IPTV solution.
Distributed streaming media system
The distributed streaming media system includes a distributed streaming media content distribution system and media services.
The distributed streaming media content distribution system is responsible for AVS content management, content caching, business management, billing, resource reporting, alarm, configuration and other functions within the distributed streaming media, and is linked with the business system to accept the configuration instructions of the business system for AVS Audio and video content distribution.
The media service is responsible for media service functions in AVS encoding formats such as on-demand, live broadcast, carousel, and time-shift TV.
Bearer network
The bearer network is mainly constructed based on the broadband network, including the backbone network, aggregation network and access network.
When deploying on a large scale, the IPTV solution based on AVS needs to consider the following elements comprehensively to realize the full support of IPTV services by the bearer network.
QoS guarantee: low packet loss rate, delay, jitter; priority guarantee for different services; high bandwidth guarantee.
Multicast capability: Multicast protocol support; multicast control management; fast channel switching; multicast forwarding capability.
Security elements: to achieve control over the legitimacy of the source and transmission security; to realize the management of users and service providers; to achieve the isolation of video services.
Reliability requirements: reliable connection of program sources; network reliability.
Home network
The home network provides comprehensive information application services that can meet the diverse communication needs of modern families. The home network solution is bundled with voice, broadband, data value-added and other services, which can meet the needs of modern home voice, Internet, video and other comprehensive information applications.
In the IPTV solution, the part involved in the home network mainly includes the STB.
Set-top box
A set-top box (STB) is an IPTV terminal device placed in a user's home. The set-top box is connected to the network through ADSL or LAN, and the user side is connected to the TV. STB has standardized universal input and output interfaces, mainly responsible for the forwarding of information from the network to the user or from the user to the network, and the media conversion function of transmitting media to the display device.
The report of the 17th National Congress of the Communist Party of China pointed out that it is necessary to develop the information industry and the modern service industry. The most important feature of the modern service industry is the combination of media interaction and service industry. To this end, the development of modern service industry must first have a good technology and application of interactive media as the foundation. ZTE is committed to promoting the development of the interactive media industry, better promoting and supporting the development of modern service industries, and playing an important role in the process of independent innovation industrialization.
At present, the ATV-based IPTV solution has been widely used in the IPTV project in Dalian, China. This world's first AVS commercial IPTV platform project was exclusively constructed by ZTE's "Network Video" multimedia business system platform solution. Dalian AVS commercial IPTV platform project adopts three-level network structure of provincial, municipal and municipal edge nodes, with an initial capacity of 30,000 lines. In the early stage, it has provided users with services including TV, on-demand, time-shift TV, recorded TV, on-demand TV, and information browsing. Later, it will also provide rich multimedia including visual communication, interactive TV, video surveillance, etc. business. In addition, it is understood that the Dalian AVS commercial IPTV platform project is exclusively constructed by ZTE. It is ZTE's "network video" system solution. After leading the MPEG4 and H.264 market in the multimedia IPTV business, ZTE's strength in the AVS field is again. witness.
ZTE's "Network Video" multimedia service system platform solution is the industry's most widely used, most mature commercial, and provides the richest variety of carrier-grade, end-to-end multimedia business solutions, which can meet the various needs of operators' multimedia business operations. , Has undertaken many projects in China, including Shanghai, Beijing, Guangdong, Jiangsu, Hubei, Hunan, Fujian, Yunnan, Shaanxi, Guangxi, Henan, Hebei and other projects, occupying more than 50% of China's market share, and entering Europe, Asia-Pacific, Latin America and other international projects market.
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