Design And Implementation Of Caching System Based On Content Delivery And Network Collaboration

With the rapid development of intelligent mobile terminals such as mobile phones,the data carried by mobile network is growing rapidly.Video transmission occupies a large proportion of the content of the mobile network transmission,and this proportion is increasing year by year with a rapid trend.The popularity of mobile network,intelligent mobile terminals,live video and other services has brings much convenience and efficiency to people,but also great challenges for content delivery of mobile network.Nowadays,CDN(Content Delivery Network)is widely used by some companies,but there are also many bottlenecks in content distribution technology for mobile networks.To solve these problems,mobile network operators try to deploy mobile content delivery network(mobile CDN)in existing architectures.In this paper,we first analyze the foundation of CDN technology,the key technology of streaming media transmission in wireless environment,and focus on the caching and content delivery technology in mobile network.On the basis of theoretical research,a series of practices has been carried out,in which we designed and implemented the MCDN system.In this paper,MEC is used as cache,and hierarchical caching is used to implement content caching on the wireless side.At the same time,the concept of collaborative region is proposed to improve the cache utilization of collaborative regional nodes through the cooperation of cache nodes.what's more,the developed system is used as a test platform to verify the strategy.In addition,through the research of Ali-Nieson,PDA,delay sensitive encoding caching algorithm,an optimization algorithm based on streaming media is proposed,which has considered service priority.The strategy is also tested and verified by the platform developed in this paper.The development of the system uses a lot of new technology,and the system is divided into several parts based on the idea of modularization.This paper has described the various modules,technical framework,deployment,etc.in detail.The design of video player has referenced HLS protocol.The m3u8 list is formed from the server migration to the client,so that the whole network can ignore the complexity of adaptive media transmission.Although the implementation of the platform has been able to achieve a variety of caching strategies,but there are still many areas in need of improvement,such as in security,performance optimization,etc.These improvements will also become the focus in the future.