Research On Domain Orientated Hybrid Caching Technologies In Information-centric Networking

With the explosion of exponential growth in data size,the Information-Centric Networking(ICN)has been proposed in order to cope with the contradiction between the Internet architecture and the changing needs of users,and this information-centric network optimization architecture has gradually become the focus of network research in the future.The architecture of ICN abandon the traditional producer-driven point-to-point mode of communication,and pay more attention to the information object itself,the data attributes and consumer interest-driven content acquisition and distribution.In-network caching covering the whole network is the key technology of ICN,however,there are still many problems in the field of caching schemes;for example,the existing researches have less consideration on the transition with current IP networks,and the impact of link restrictions and network congestion.At the same time,the existing solutions generally utilize only a single layer of network optimization factors,and the optimization results cannot meet the performance balance of user experience and cache hit ratio.This paper studies on the new characteristics of in-network caching and the problems that the in-network caching scheme still faces.Firstly,this paper proposes novel Domain-Orientated Coordinated Hybrid Content Caching and Request Search in ICN,which fully exploit content-space partitioning and divide the cache network into a core area and several edge areas.The off-path HASH-based coordination scheme is applied in core area for improving the diversity of caches in the network.In addition,on-path reversion scheme is deployed in edge areas.The binary tuple is created to record the information of content placement and guides the request routing,implicitly combining content popularity and cache repetition.The scheme utilizes the content-space partitioning and coupling effect to realize the reasonable placement and addressing,and at the same time better balances the utilization of network resources and user experience.Adopting different cooperation mechanisms in different network regions also makes the hybrid technology more scalable in large ISPs.Based on the hybrid technology framework,this paper further studies the on-path caching scheme in edge areas and proposes a Link Congestion and Lifetime Based In-Network Caching Scheme in ICN that objective is to optimize the download latency while maintaining the cache hit rate.The core idea is that recording node betweenness to select relatively important nodes on the transmission path,and then calculating the lifetime on these nodes according to the delay saving,content popularity and content size-the lifetime determines the storage and replacement of content.The solution of the paper ensures that caches occur at the important nodes in the network,and the content with high popularity and saving-delay is allowed to be cached local longer.By this way,the scheme can reduce network cache redundancy while achieving a more balanced placement of content;avoid as much as possible subsequent requests getting content over the congested link,and make the solution sensitive to congestion.The simulation results show that the proposed caching scheme improves the download delay significantly when the network is congested,and improves the cache hit rate and response hops.