Content Sharing Capability Of Dual-Architecture Network

Due to the inconsistency between the address-centric Internet architecture and the content-sharing oriented Web application services,the current C/S model-based Web application exists the four mismatches as follows:(1)between the URL(Uniform Resource Locator)content discovery mechanism based on IP packet routing and the content-discovery capability in the backbone network;(2)between the URL request-responding mechanism restricted by the wireless channel capacity and the request-responding capability in the edge network;(3)between the content trading ecosystem based on intermediary and the stakeholder-profitability capability;(4)between the URL content access mechanism based on pull model and the content-access capability.To this end,we proposed a Dual-Architecture network(DAN)for content sharing with the characteristics of in-networking cache(caching in the Broadcast-Storage network devices),end cache(caching in the Broadcast-Storage terminal devices),intermediary-free content trading ecosystem,and broadcasting-push.Qualitative analysis shows that the DAN could effectively alleviate the these mismatches and promote the content sharing capability for the current Internet.Nevertheless,due to the deficiencies of qualitative analysis,it prevents the DAN from further developing.Hence,this dissertation aims to comprehensively study the DAN in terms of the content-discovery capability of the backbone network,the system-load capability of the edge network,the stakeholder-profitability capability of the ecosystem,and the content-access capability of the end-user.Specifically,the main achievements and contributions include:First of all,it summarized the related content sharing technologies,and then proposed a comprehensive evaluation framework for content sharing capability,which is to be utilised to quantitatively analyze the sharing capability for the DAN;it summarized the address-centric feature for the Internet architecture,and then analyzed the reasons for these content sharing mismatches,which could clarify the necessity and significance of the DAN we proposed;it introduced state-of-the-art in Content Delivery Network and Information-Centric Networking,and then summarized their basic defects respectively;it sorted out the research progress of the DAN in the past two decades and proposed a Broadcast-Storage architecture reference model,and then sorted out the current complementary architectures proposed by the industry,which could elaborate the key idea and application feasibility of the DAN.At the aspect of content discovery in backbone network,it designed a UCL(Uniform Content Label)request forwarding strategy in the basic of BS domain and in-networking cache,and then employed a bipartite graph to formalize a content publishing model;it mapped the broadcasting-association between the sending and receiving nodes to the cache-association between the BS nodes through a downward projection,and then constructed a UCL request forwarding model based on the in-networking cache;it generated the specified UCL request forwarding graph by employing a generalized random graph generation approach,and by examining the topological characteristics,it obtained the theoretical upper limit of the average and maximum request forwarding hops for UCL requests in normal and worst cases;it verified the above theoretical results through simulation experiments,and explained the advantages of the DAN in terms of request forwarding hops.At the aspect of system load in edge network,it constructed a UCL request-response model based on BS end cache;by analyzing the dynamic evolution of the end cache according to the birth and death process and the distribution of URL requests offloaded,it obtained the UCL request-response capacity gain of the DAN compared to the single cellular network;under the restricted scenario it analyzed the main restrictions for UCL request-response capacity,and optimized the UCL request-response capacity in the different conditions of broadcast channel and cache volume,and then proposed the greed-based corresponding optimal methods;it designed a broadcast-unicast cooperative distribution simulation system and verified the effectiveness of the above theoretical results through simulation experiments.At the aspect of stakeholder profitability in trading ecosystem,it constructed an intermediary-free content trading model,and then selected user utility and CP revenue as the specific evaluation metrics for content trading profit;it defined a user utility model and optimized overall user utility in two scenarios,namely low and high user income,and then proposed corresponding optimal solutions based on linear programming;it adopted dynamic game theory to explain game relationship between CPs in the intermediary-free ecosystem,and explored sub-game refinement Nash equilibrium to optimize individual revenue in the dual-CPs and multi-CPs games,and proved that there exists a unique Nash equilibrium in the multi-CPs game;it validated the effectiveness of the above theoretical results through specific cases analysis.Lastly,we developed a web page-oriented dual-architecture application prototype.By the development of prototype,it can clarify that the DAN and its Web application paradigm has the feasibility of system implementation;it analyzed the main performance bottlenecks during the Web page access,and measured the round-trip delay of Web page access for end-user in the prototype.The results showed that the round-trip delay is only about half of that in the Internet and the jitter phenomenon is not obvious.Besides,by analyzing the specific process of Web page request and response the effectiveness of the above empirical results is verified.In summary,for comprehensively evaluating the content sharing capability of the DAN,this dissertation quantitatively studied the theoretical upper limit of the average and maximum UCL request forwarding hops,the gain and capacity optimization of UCL request-responding capacity,the optimization of the content trading profit for the user and CP and the actual round-trip delay for the end-user.Consequently,it could break through the limitations of qualitative methodology and provide a theoretical basis for a more profound perception of the DAN and its web application paradigm.