多媒体网络:从内容分发网络到未来互联网

Multimedia Networking: From Content Delivery Networks to Future Internet

近年来,随着网络技术的飞速发展,互联网流量视频化的趋势日益明显,视频应用使互联网的可扩展性、可演进性、服务质量和网络安全面临诸多挑战.内容分发网络通过在应用与网络间构建覆盖网,为解决网络视频应用面临的分发难题提供了有力的支持,也成为当前网络视频产业中的关键技术.但是随着视频应用在移动性、交互性、异构性以及可扩展性方面需求的不断增长,现有内容分发网络技术面临重大挑战,学术界与工业界都试图从互联网体系架构入手解决网络视频应用中的问题.文中系统总结了内容分发技术面临的挑战以及现有互联网体系结构研究的思路与核心技术,提出了面向未来网络的多媒体网络设计思路.

As network technologies develop rapidly in recent years, more and more network traffic are taken by video applications, which introduces challenges to the scalability, evolutionary, QoS and security of existing Internet. By constructing an overlay network between applications and networks, CDN provides a strong support to solve the distribution problem faced by video application, and becomes a key technology in current video industry. But with the growing demand of video applications in terms of mobility, interaction, heterogeneity and scalability, existing CDN faces significant challenges, and bothacademia and industry are trying to solve the challenges by redesigning Internet architecture. This paper summarizes the challenges that CDN faced, the ideas and core technologies of the existing Internet architecture, and then puts forward the design ideas of multimedia networking for future networks.