Research On Proactive Pushing Mechanism Of Mobile Provider In CCN

With the development of internet,the network traffic is growing rapidly.The communication mode has been changed.The drawbacks of internet gradually highlight.Scholars from all over the word have studied on future internet prominently.With the advantages of high safety and resource utilization and good dynamic performance,CCN(Content-centric networking)has shown the biggest potential as candidate future internet architecture.However,as a rising architecture,CCN can alleviate the adverse effects caused by the movement of the content source with the help of cache function.CCN still has several problems,such as the delay of content transmission is long,the ratio of interest packet loss is big and the poor user experience.This thesis focuses on the content source mobility problem that exists in the current CCN.The main contributions are summarized as follows:1.A scheme of centralized pushing based on popularity and profit of content is designed.The characteristics of content are analyzed and then a value model is designed according to transmission cost,caching profit and caching cost.The model acts as the basis for content pushing.The content popularity is computed and then the pushing probability model is designed.In order to finish pushing content proactively,two special interest packets and one data packet are defined.Adverse PIT entry is used to establish pushing path.The content is pushed to the access router along the pushing path.When the content source is mobility,consumer can still require the content in the mobile content source along the original path.The simulation results show that the scheme reduces transmission delays and increases the hit ratio of interest while content source is mobility.2.The scheme of decentralized pushing based on location and space of nodes is designed.It applies to the environment that the number of mobility content sources is large in the area.The contents are pushed to nodes which located in the center and having plenty of remaining cache spaces.Mobile broadcast interest packet and mobile response data packet are defined in order to get the location and remaining cache space of node.The storage density of the content in the region is analyzed,and the push probability model of the content is redesigned with the content popularity and storage density.The simulation results show that the scheme can still obtain better network performance while the number of mobility content sources is larger.