可交互流媒体服务中的应用层组播技术研究  

Research on Application Layer Multicast in Interactive Streaming Media

作　　者：陈建忠[1] 李文中[1] 司春峰[1] 陆桑璐[1] 陈道蓄[1] 

机构地区：[1]南京大学计算机系计算机软件新技术国家重点实验室,南京210093

出　　处：《计算机科学》2009年第1期105-110,125,共7页Computer Science

基　　金：国家高技术研究发展计划863项目(No.2006AA01Z199);国家重点基础研究发展计划973项目(No.2006CB303000);国家自然科学基金(No.90718031;No.60721002;No.60573106)资助

摘　　要：在开放、动态的网络环境中,网络构件致力于如何有效地整合和共享多样化资源。近年来,流媒体应用在In-ternet上日趋流行,由此带来了资源共享和节约带宽消耗等一系列挑战性的问题。应用层组播被认为是解决大规模流媒体应用网络拥塞的一种有效技术。然而,流媒体交互操作会引起组播树的频繁重构,从而降低系统性能。提出了一种支持可交互操作的应用层组播树构建协议ISMT(Interactive Streaming Multicast Tree),可以降低用户响应延时和改善系统的扩展性。通过仿真实验验证了ISMT协议的有效性。Internetware tends to resolve the integrating and sharing of various kinds of resources in open,dynamic and changing Internet environment. In the recent years, streaming media applications becomes more and more popular on the Internet, which introduced challenging issues such as resource sharing and bandwidth saving. Application layer multicast has shown to be efficient in reducing network traffic for large-scale multimedia applications. However, interactive operations such as VCR may cause frequently reconstruction of multicast trees,which will degrade the system performance. We proposed a protocol called ISMT （Interactive Streaming Multicast Tree） to construct and maintain interactive application layer multieast trees, which aims at reducing user response delay and enhancing system scalability. The effectiveness of the ISMT protocol is validated by simulations.

关 键 词：可交互 流媒体 IP组播 应用层组播 INTERNET 

分 类 号：TP368.5[自动化与计算机技术—计算机系统结构] TP393[自动化与计算机技术—计算机科学与技术]