Key Technology Research In The Combination Of Software-defined Networking And Information-centric Networking

TCP/IP architecture as the core of Internet,the initial design philosophy is to share the hardware resources,with the rapid growth in the computer hardware cost reductions and network traffic,in order to adapt to the development of Internet technology,Information-Centric Networking becomes one of the most popular next-generation Internet architecture research,Content-Centric Networking gained wide attention because of its unique features,such as flexible,efficient routing and forwarding mechanism and caching strategies and IP compatible hierarchy architecture and so on.Users can send content request directly to the network and the content request can be satisfied by any provider which contains the content in the network.In order to achieve content-centric design goals,the nodes in Content-Centric Networking supports caching function,reducing the time required for users to access content while reducing duplication of network traffic,content caching technology has become the center of a network of key technologies one.Although Content-Centric Networking has many advantages,it is difficult to deploy in Internet and is hard to update after deployed.The OpenFlow technology in Software-Defind Networking may provide a new way to solve these problem.The thesis firstly presents the Content-Centric Networking architecture and its key technologies in detail,then we study its caching strategy and routing mechanism in depth.On this basis,through the study of software defined network in OpenFlow technology analysis,we proposed a SDN-based ICN architecture and designed the first set of content-flow communication simulation solutions to realize it.This architecture can take advantage of the modified OpenFlow switches,while the development of the controller function modules to achieve content-centric networks and efficient routing and forwarding mechanisms within the network caching mechanism.Popular contents may be replaced frequently in traditional LRU strategy.So we gave a detailed analysis of the cache replacement strategy and modeling,and then proposed a time-based protection replace strategy to reduce this phenomenon,while the design of the dynamic adjustment algorithm to adjust the guard time,makes the strategy easily adapt to the flow changes in actual network architecture.Through the simulation analysis,we proved that the replacement policy can applies to the SDN-based Content-Centric Networking architecture,the strategy enhances the awareness of the content popularity in the network,and optimizes cache performance,reduces redundant traffic within the network and improves network utilization of resources.