| With the rapid development of Internet technology and applications,and the rapid growth of Internet users,features such as content centralization and personalization have become a main theme of the development of Internet.According to statistics,the demand for content has greatly increased in the past ten years,and will continue increasing in the next few years.In addition,the TCP/IP protocol,which is the core of the traditional network architecture in resource scheduling and security,also caused a lot of problems.In order to adapt to the change of the existing demand fundamentally,the American academic community begins to propose a content oriented network architecture,which is called as information center network.Information center network will no longer use the address as a class entity,but the information as the most basic entity,through the content name to locate and address.Among them,NDN,which was created by the Zhang Lixia team,can obtain the data content according to the data name,and has many advantages,such as user driven and security.Now,NDN has become a mainstream information center network architecture.At present,a lot of researchers have studied the relevant research in NDN network,such as Internet chat and video conference,and have achieved a series of theoretical and practical results.Generally speaking,the audio transmission system exists as a sub-module of online video playback system.However,due to the limited transmission rate of the network,the audio transmission research is still valuable.Meanwhile,audio transmission has continuity in time,and has great probability for optimization.On the other hand,the design idea of named data network regards cache as a polymerization unit of same content,so that dynamic content is difficult to take advantages of cache sub-system,which leads to low quality user experience.Therefore,we modify the system to achieve a real-time audio transmission algorithms and audio transmission system based on the following problems.The real-time audio transmission algorithm modify routing node,then forward a request to the next node when a user sends a request with the serial number of the audio frame,and pre-cache content before the next audio frame request is coming.So that when the user requests,it is possible that the cached content will be delivered to users nearly to save the user’s access time.Compared to conventional methods,the algorithm is transparent to the user on the network.User side and the server doesn’t have to implement complex synchronization and flow control mechanism,and can get a faster transfer speed through the original request method.On the other hand,audio transmission system modified the NFD background forwarding module by adding a policy approach.By setting the profile parameters,it can also decide whether to apply the algorithm to different ranges of content.The audio transmission system can be put into practical application,and provide a certain degree of flexibility.What’s more,with a simple modification,the system could be used for other types of streaming file. |
