The Research On Data Replacement Policy Based On Request Frequency Of NDN Cache

With the rapid development of the Internet,there are more and more content-based applications,people are becoming more concerned about the content itself,not where the content is.Therefore,end to end communication model has been difficult to adapt to the needs of users,and traditional Internet architecture based on IP shows a lot of problems.To solve these problems,the Information-centric networking(ICN)architecture is presented,NDN is one of the most popular Information-centric networking architecture,it names the content of network,take name rather than IP for data transmission so that the core of Internet infrastructure changes from the "host" to "content",and it let all the routers in the network have the cache function that data could be cached in a greater range.However,due to limited cache space,it is important to design a highly efficient cache management mechanism so that the overall cache performance of NDN network could be improved.This paper mainly have the research on the cache management mechanism of NDN network,the main work includes the following two aspects:1)Due to the limited cache space of single node in the NDN network,when the cache space is full and new data must be cached,the node will use the cache replacement policy.Based on the defect of commonly used cache replacement policy,this paper proposes a new cache replacement policy.This paper will collect the data request frequency respectively according to different request time,according to the data request during different period,This paper will set data different weighting factor based on its different impact on the future popularity prediction,thus put forward a weighted frequency based real-time data replacement policy(WFRRP).2)Since all nodes have the cache ability in the NDN,and the WFRRP can improve the cache situation of single node,but it may make popular data are cached to the part of the nodes,resulting in cache data is not balanced,reducing the overall efficiency of the cache.In order to improve the cache capacity of the overall network,this paper presents a neighbor cooperative cache management policy based on WFRRP,this policy allows multiple nodes within the local area to cache data,thus can utilize the cache capacity of all nodes,improve the overall cache utilization.