APAIMD算法及基于此算法的APTCP协议

APAIMD Mechanism And APTCP Based On This Mechanism

本文提出了一种可调参数AIMD算法和一种在接收端实现该算法的适合在Internet上传输多媒体流的可调参数传输控制协议。UDP不适合传输多媒体数据 ,因为它没有拥塞控制机制。TCP遇到单个数据包丢失传输速率就减半 ,会造成速率剧烈抖动 ,也不适合传输多媒体数据。在APTCP控制下传输的多媒体流具有良好的速率平滑性 ,并能够与竞争的TCP流公平的分享带宽。APTCP便于升级到组播多媒体业务 ,可用于非对称网络。

This paper proposes an AIMD mechanism whose parameters are adjustable, so called Adjustable Parameters AIMD or called APAIMD for short, and a transmission control protocol which realizes this mechanism at receivers and is fit for transporting multimedia traffic in Internet, as its parameters are adjustable, called Adjustable Parameters TCP or called APTCP for short. Neither UDP nor TCP can be used to transport multimedia data, because UDP has no congestion control mechanism and TCP reduces the sending rate in half in response to a single packet lost, which will result in rate wobbling greatly. Under the control of APTCP, multimedia traffic has good smoothness of sending rate and can share bandwidth with competing TCP flows fairly. APTCP has a promising avenue of development for multicast multimedia services, and can be used in unsymmetrical networks.