未来网络的研究进展和发展趋势

Research progress on future Internet

日益增长的网络规模和用户需求给互联网带来了诸多挑战,其中WWW、P2P等信息(内容)共享业务更给网络造成了巨大的压力,同时也降低了用户上网体验(如网速下降),服务提供商对此亦束手无策。如何从网络结构、协议体系和服务模式等方面应对这些挑战,将成为未来网络研究的一个重要方向。从互联网的发展历史和主流应用出发,对未来网络的"渐进式"与"革命式"两大类研究进行了综述,揭示了内容共享业务占据网络绝大部分带宽的原因在于相同信息的大量重复(冗余)传输,指出未来网络应该以内容作为网络设计和服务模式的核心,并以内容的高效获取和带宽的节约(降低数据包重复传输率)为双重优化目标。通过对一种新的网络结构和信息服务模式"非对称广域覆盖信息共享网络"的分析,提出了未来网络将以"低带宽、均负载"的需求提供"高智能、高效率"的内容共享信息服务为主要研究方向的新思路。

Current Internet is now facing multiple challenges because of the continuously extending scale and the ever-increasing demands.Especially,information（content） sharing applications such as WWW and P2P have brought tremendous pressure to the Internet and severely affected user experiences,while the ISPs（Internet Server Providers） could do nothing about it.How to make changes on network architectures,protocols and service models to cope with these challenges will be the major trend in future Internet research.Starting from a brief review of the history of Web and statistics of Internet applications,two types of research approaches,namely evolutionary and revolutionary approaches,were presented respectively.Duplicate transmission of same contents consumes large part of bandwidth,thus saving bandwidth and improving the efficiency of content distribution should be the optimization objectives of future Internet research.An on-going project called ＂asymmetric network architecture for ubiquitous information sharing＂ was also introduced.This work shows the authors’ vision towards future Internet,that is,the Internet should be able to support information sharing services in a more intelligent and efficient way without bringing heavy traffic.