Research On Key Problems Of Internet Live Broadcasting System Based On NDN Mechanism

Since the beginning of the 21 st century,computer and Internet technology have developed rapidly,reaching every corner of our lives at an astonishing speed.However,such rapid development is not comprehensive.With the rapid development of high-level Internet technologies,the network protocols and architectures stipulated in the last century have been far from supporting emerging technologies that have sprung up.So updating new network protocols and architectures is imminent.In 2010,the National Science Foundation proposed the Named Data Network(NDN),and its cutting-edge ideas and innovative mechanisms have caught the attention of researchers around the world.However,due to the limitations of the IP network,the NDN network cannot form a large-scale deployment for a time.This article will refer to these mechanisms and characteristics of the NDN network,combined with the current most popular Internet live information carrier,design and implement an NDN-based Internet live broadcast system to meet the user's demand for webcasting.The main research direction of this topic is to apply the NDN mechanism to the live webcast.The traditional TCP/IP architecture uses the IP address as the core to carry out address forwarding.It requires that the corresponding host address must be resolved to complete the communication.The NDN based on the data name of the transmission packet,the analysis and routing process merged,or remove the process,while reducing redundant data,but also allows the node router to cache more data,and facilitate the increase of transmission efficiency.Therefore,it can be said that NDN is tailor-made for network streaming media.Therefore,on the one hand,as a potential development direction of the future network architecture,NDN will inevitably appear on the Internet live broadcast system based on the NDN network;on the other hand,applying the NDN mechanism to the Internet live broadcast can be said to be the right remedy,and the characteristics of the NDN native can just be The problems that are currently facing the Internet broadcast can also meet the needs of the rapidly growing Internet broadcast in the future.It can be said to serve two purposes.The goal of this project is to design a network live broadcast system based on the NDN mechanism by combining existing methods.The architecture of the system is divided into three parts: a streaming media acquisition layer,a data distribution layer based on an NDN mechanism,and a streaming media playback layer.The streaming media collection layer is responsible for capturing and encoding the user's live video through video capture devices such as the user's built-in camera,and converts the different formats into a live video format.The streaming media layer buffers the video stream.Processing,spelling frames,codec,and finally restore playback;the design of the data distribution layer is the focus of this study,using NDNbased mechanisms to achieve streaming media live data after the collection is completed to inform the directory management server and pre-processing server with different rules.The data is passed on the principle that the routing node should follow,as well as the design of the format and name rules of the data packet itself.At the same time,this paper proposes a new TD(Time-Delet)cache replacement strategy.Through this strategy,the cache rules of routers in the NDN network mechanism are optimized so that the cache nodes can cache more useful data more efficiently.Web user experience.Finally,this paper implements TD cache replacement strategy on ndnSIM simulation platform and implements the system simply.This paper compares the TD cache replacement strategy with the existing native lifecycle cache replacement strategy and LRU cache replacement strategy in the current NDN network.According to the data generated by the comparison experiment,it is proved that the TD cache replacement strategy can effectively reduce the network delay and improve Cache hit rate,but also found some deficiencies in the strategy and areas for improvement.