Research And Implementation Of Sdn-Based Icn Architecture And Efficient Caching

Information-Centric Networking (ICN) has become one of the hotspot of the next generation Internet architecture research. Named Data Networking (NDN) project gains widespread attention on account of its unique features, such as flexible naming schema, efficient routing and forwarding system, IP compatible hierarchy architecture and so on. NDN supports caching contents on the path from content providers to content consumers to improve user experience and reduce costs. However, this strategy leads to a high redundancy along the request-response path, which results in a high cache replacement rate and a low cache hit rate.The thesis first presents a detail analysis of the architecture and key technologies of NDN including a depth study for its on-path caching strategy and deployment problem. Based on this, a SDN-based ICN architecture Named Flow Network (NFN) is proposed after the investigation of the emerging Software-Defined Networking (SDN). NFN takes the advantage of OpenFlow to implement content requesting and distribution, name-based routing and efficient in-network caching schema PRE (Partition Redundancy Elimination). PRE improves the diversity of caching through eliminating redundant duplicates of contents and reduces cache replacement rate, thereby increasing the average cache hit rate of the whole network and reducing content access delay, cost of bandwidth and the load of content servers.Feasibility validation and performance evaluation of NFN and its caching schema PRE are conducted using NS3simulation environment by extending the functionality of OpenFlow modules. The results show that NFN combined with PRE achieves efficient content distribution and caching.