| Since the beginning of the new century, accompanied by the rapid development of information technology and user demand for multi-service continue to strengthen traditional telecommunications network, independent Internet and cable television operators to carry the business model of development continue to mutual penetration and fusion of the "triple play"model of development become the trend of the development of the information industry.Some radio and television operators building DVB systems, digital TV broadcast services to cable television subscribers, the overall shift to digital television; The DVB interaction is not strong, can not provide a real-time interactive video services;These defects enables operators to look more turned to interactive TV.The interactive television broadband network to the home TV set-top box as a major ratings terminal to provide a variety of interactive digital media services including television programs, including through the Internet Protocol.Its ability to provide users with high-quality digital media services, the freedom to select the program, operators substantive interaction and the application content. In addition to the video business, able to integrate a variety of interactive television, interactive classes combine video and data applications.First, in the discussion of Hebei Radio and Television interactive digital TV VOD system project background and the actual situation of Hebei Radio and Television, conducted a detailed needs analysis and detailed use case diagrams and flow charts is described for the needs analysis.Based on needs analysis based specification NGOD the overall framework for interactive digital TV VOD system design, Hebei Radio and Television. First, according to the system requirements of the target with the principle of system construction, the design of the architecture and functionality of the overall system deployment architecture. Overall deployment architecture of the system from a unified brand highlight Hebei radio and television networks, unified management, unified deployment benefits of intensive management, cost savings, consider using a distributed deployment. Functional architecture design, discuss the function of each part of the system, Finally, a complete set of functional requirements solutions.Distributed three-tier deployment model the central node deployment BO CDN center of components in the design of the system deployment. BO center node component implementation is presented in the realization of the the portal show ads feature business needs; CDN central node components to achieve acceptance and distribution of the prefectures CDN node; City-core nodes deployed BO CDN City-node components. BO cities node component implementation to push streaming server and CDN management, user management, city EPG show, resource management; CDN cities node components mainly responsible for receiving center CDN distribute content and distribute content to the edge of the cities of push streaming server node. BO components of the city-edge node components cities of edge node deployment BO and VSS (streaming server), the prefectures edge node with the set-top box data interaction; The prefectures edge node push streaming server is mainly responsible for the set-top box providing streaming services.Content page show the demand for both the main consideration in the design and implementation of the system functions. Content through a Content Management System (ICMS) content acquisition and management, content distribution and content distribution systems (CDN), the final push streaming server user set-top boxes to provide video services. Page page design portal management system (CLPS) show (EPG). call metadata content, advertising the show as well as other external systems show, such as public information, weather forecasts, government information and other information show.Finally, introduce a system to meet the stress test tool test on the number of concurrent user pressure bearing demand. |
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