The Research And Implementation Of Content Delivery And Load Balance In IPTV System

With the development of broad band network and streaming media technology, IPTV (Internet Protocol Television) has entered to general families. IPTV technique not only enables regular users to choose their favorite information and content, such as movies, TV series, entertainment programs and news with well-known TV sets at anytime, but also makes remote education and online training more convenient and efficient.CDN technology can enhance the Quality of Service (QoS) in IPTV system. With the help of CDN, IPTV can distribute the contents to much closer places to users. This will get rid of the congestion brought in by the large number of users, and thus reduce the pressure brought in by IPTV to the Internet, and shorten the response time to users.It emphatically studies two key technologies in IPTV system: content distribution and load balance. It introduces the conception and theory of Content Delivery Network, expatiates the rationale of CDN, and gives the framework suitable for IPTV. Meanwhile it analyses the strategy which is based on equally segmented distributed policy. The strategy divides the program into equal segments and number them, then push the segments to ME to realize the media segmented distributed technique which is quite suitable for IPTV system.Load balance is the key point and difficulty in IPTV system, affecting directly the system user's service ability. Therefore, it gives a load balance method which is based on segmented distributed policy after it introduces the technology and common realized strategies of load balance, meanwhile test the influence of segment scale to system load balance. This strategy includes the following algorithms: Media server selection algorithms, which is to assign user request; File balance algorithms, which is to adjust file distribution based on requesting rate.The application result indicates that the system can meet requirement not only the service quality but also service ability. It runs stably, and the cost performance is fairly high.