A Research On Key Technologies Of P2P-based Content Distribution Networks

With the development of Internet technology, the Internet can provide more and more application services. The contents like web pages, images, audio, video, and other data on the network are increasing. With the growth in data content and the number of users, content providers have some problems with content distribtuion. Firstly, the user distribution in the edge of network, but the servers were centralized deployed in the network. There are some distances from the clients to the servers, so in this case the user can not guarantee the quality of service and access the contents with larger delay. Secondly, bandwidth consumption of content access is too large, and the concentrated servers became a bottleneck affecting experience of clients access to the contents. The content delivery network (CDN, Content Delivery Networks) was born in this context. Content distribution network distribute the contents to the edge servers that deployed at the network. Client requests were directed to the nearest edge server to get contents.In this thesis we study how to improve the performance of content distribution networks through P2P technology. The contributions of this thesis includes five aspects:Firstly, a P2P-based content distribution network architecture called DLC-PCDN was designed to improve the existing structure; A content distribution strategy based on the pedigree chart SDPC-CDS was proposed to solve the problem of the traditional distribution method does not support service differentiation, and it optimize the performance of the distribution through the distribution decision tree;A global resource discovery algorithm G1-hop was proposed, which is based on1-hop. A new type of message propagation algorithm in Gl-hop was designed. This message propagation algorithm is more suitable for the CDN system environment, and it faster than the traditional algorithm, so it can reduce the lookup error rate, and improve the content resource discovery performance of the system; A local content routing algorithm LCRR was proposed to improve the contents requested performance; A collaborative cache update deployment strategy EPP-CPS was proposed. It resolve the problem of cache server collaboration, and it can improve cache performance.