Research On Efficient Caching Strategy In Named Data Networking

Since the appearance of Internet,it has been improved many times.With the development of Internet technology and the rapid growth of the number of users,the streaming services have gradually occupied most of the traffic in the network,and the applications of the Internet has also paid more attention to the distribution of data content.However,the traditional TCP/IP networking has many problems in mobility,security and so on.So Named Data Networking(NDN),which is one of the future Internet architectures,has attracted increasing attention.In named data networking,the data transmission is content-centered,and the content is divided by naming mechanism,and the name of the content is used for addressing in the transmission path.Named data networking caches the transmitted data by using internal cache.Each routing node in the data request path can cache the returned data to reuse the data,so as to make a quick response when subsequent requests arrive,which improves the efficiency of data transmission of the network.Researchers carry out a lot of research work on caching technology of NDN.Currently,the default caching policy is LCE,which can cache the data of all nodes on the returned data path.It can produce a large number of redundant data,leads to frequent cache replacement,and reduce the diversity of the cache and the overall performance of the network.The main work of this paper is as follow:1.This paper introduces the related knowledge of named data networking,expounds the architecture model and naming mechanism of network and analyzes its advantages.Then it introduces the routing and forwarding mechanism of the named data networking and the congestion control mechanism,and makes a comparative analysis of traditional TCP/IP to illustrate the improvement of named data networking in these aspects.2.The caching mechanism of the Named Data Networking is introduced,and the two caching strategies are described separately.What's more,in case of the defects in current default caching strategy,this paper elaborates on the rotated router caching strategy.By adding flag bits for data packets,the adjacent routing nodes can avoid caching the same data,which effectively improves the caching performance.Experimental results show that this strategy reduces memory usage and increases the answer speed of data request.3.The dynamic content heat in the network transmission process is analyzed and taken as an important condition for the routing node to cache the content.It also introduces the caching strategy based on dynamic content heat,presents the algorithm flow,and verifies the feasibility of the scheme through the simulation platform.The results show that the strategy improves the cache hit rate and reduces the number of cache replacement.