Research On Streaming Media System And Key Technology Based On CDN And P2P Hybrid Architecture

With the rapid development of Internet and PC performance improvement,people no longer just satisfied with traditional text web browsing, email transceiver and online chatting application. Because of the peculiar entertainment and interactivity of streaming media, it has more and more get the favor of people, and become the fastest growth in the current Internet application.In this paper, based on the research of advantages of CDN and P2P and current mainstream fusion way, we proposed the mixed network architecture with CDN and P2P HCPMSA (Hybrid CDN-P2P Streaming Media Service Architecture), in addition, the key technology which effect stability of the system and the efficiency is discussed.The special research content and work are as follows:(1) We have made comprehensive research on the advantages, disadvantages of CDN and P2P, and the main fusion way of the two technologies now. A reliable, easily managed and extensible mixed network architecture with CDN and P2P.(2) We study the main factors influencing system stability. The mathematical model of analysis of the factors is established in this paper, which sets the system to a 3 hierarchy through the stable value.(3) The popular P2P node selection algorithm is investigated in this article, and a mathematical model of reliability is established; a P2P resource node selection algorithm, based on the reliability, comprehensively considering the reliability, load balance and contribution of service node, is put forward.(4) We research streaming media coding expand technologies. In the system, streaming media files are divided into different grades, and the user requests are divided into different priorities. A strategy based on the stability of the system classification prevention and rehabilitation is proposed. The grading in the system refers to the media file classification, users of priority and the stability of the system hierarchical classification. The experiment environment is based on Cygewin+NS2. It mainly tests the system throughput, jitter rate and request rate of the peers. The experiment result shows great improvement in these parameters. This proves that the design of this system can guarantee the QoS as well as improve the stability of the system.The innovation points of this paper are as follows:(1) It gives a network architecture of CDN and P2P which combines the reliability and manageability of CDN and the extendibility of P2P.(2) According to the load situation and network condition, it puts the concept of system stability value and designs a prevention and scheduling strategy based on it.It designs a peer choice algorithm based on reliability. The algorithm considers peer's load balance, contribution value and reliability at the same time.