Research On Hierarchical Data Cache Method In Named Data Networking

With the development of Internet technology,people’s demand for network service quality is increasing day by day.Among them,the delay,quality and security of data information acquisition have become important indicators to measure network service quality.However,the current Internet architecture based on IP address has some problems,such as domain name conversion and address center.Therefore,resource sharing centered on data information content has become the development trend of the next generation of Internet.In recent years,Information-Centric Networking(ICN)has been widely demonstrated as one of the typical representatives of the future Internet architecture due to its characteristics of Information sharing based on data content name.Named Data Networking(NDN)is regarded as one of the most feasible solutions in ICN due to its unique characteristics of In-Network Caching and coupled routing.It is also the focus of ICN research by scholars and institutions at home and abroad.In NDN,the Subscriber generates and sends the Interest packet to obtain the required data content,and the user or server that stores the data content,that is,Publisher generates the Data packet containing the Data content and returns to Subscriber along the original path of Interest to complete an information exchange.In view of NDN’s unique In-Network Caching mechanism,each NDN router is configured with a data cache to cache the data content encapsulated in the path Data packet.The Cache Everything Everywhere(CEE)approach can effectively improve the efficiency of Subscriber obtaining information.However,the following limitations exist at the same time: First,all routers along the path cache the same data content,resulting in a low difference in the cache content of NDN routers along the path;Second,the current NDN cache replacement method is mainly based on the sequential replacement principle,which will lead to the replacement or deletion of data content with high request frequency(popuarity),affecting the quality of network service.Aiming at the above problems,this paper proposes a data caching method based on router hierarchy.This method firstly classifies NDN routers on a specific path,and caches them to routers at the corresponding level according to the data content heat of Subscriber request,so as to improve the efficiency of obtaining data content with high heat.In order to verify the superiority of the proposed method,ndn SIM simulation platform was used in this paper to conduct comparative experiments with Cache Everything Everywhere、Probabilistic Caching(Prob Cache)、Leave Copy Down(LCD)and Consumer-based Proximity Caching Algorithm(CPCA).The experimental results show that compared with the above four methods,the proposed method can improve the cache hit ratio,reduce the average route hop count and the average request delay.To some extent,the service quality of NDN network is effectively improved.