摘要
传输控制协议(TCP)是目前在Internet上使用最广泛的传输协议。理论和试验表明TCP连接在一些情况下是不公平的,这些情况包括多拥塞网关、不同的往返延迟和不同报文大小等。该文提出一种"显式公平控制"(EFC)算法来解决这个问题,其主要思想是通过在网关和端系统都增加机制来单独进行公平控制。在TCP的报文头中增加一个"速率标签"来携带目前的发送速率,网关可以使用报文头中的这个信息对报文区别对待。试验结果表明EFC算法可以有效的改善TCP连接的公平性。该文还讨论了如何在Internet中逐步使用EFC算法。
Transmission control protocol (TCP) is the most widely used transmission protocol currently in the Internet. However, various tests have shown that TCP connections are unfair in some situations, such as multiple congested gateways, different round trip times and different packet sizes. An explicit fairness control (EFC) algorithm was developed to provide fairness over a wide range of conditions. The algorithm improves fairness by adding mechanisms at end systems and gateways. A RateTag added to the TCP header to indicate the current sending rate is used by the gateways to vary treatment of the packets. Test results show that the EFC algorithm improves fairness in situations where TCP connections are unfair. The gradual deployment of the EFC algorithm in the Internet is also considered.
出处
《清华大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2003年第9期1280-1283,共4页
Journal of Tsinghua University(Science and Technology)
基金
国家自然科学基金资助项目(69725003
90104002
60203025)
