摘要
Providing different service priority levels for different kinds of traffic is an important research area in the Internet.As compared with the existing best-effort(BE)service,recent researchers consider devising the belowbest-effort algorithm to realize a low priority service.The aim of below-best-effort service is to use the available bandwidth as much as possible in the premise of not interfering standard best-effort flows.With the best-effort transmission control protocol(TCP)transporting foreground traffic,below-best-effort service can transport background traffic which users do not urgently need to use.In this paper,we review the evolution of below-besteffort service and classify and compare these below-besteffort schemes.We also present some open problems in the research of below-best-effort service and point out the future work.
基金
supported by the National Natural Science Foundation of China (Grant No.60502037)
the Specialized Research Fund for the Doctoral Program of Higher Education of China (No.200800131019)
Program for New Century Excellent Talents in University (No.NECT-07-0109)
the National High Technology Research and Development Program of China (No.2007AA01Z206).
