网络主机时钟相对漂移模型研究

时钟同步是网络测量、管理的要求,由于时钟漂移现象的存在,难以实现精确的时钟同步。论文采用相对时钟代替绝对时钟,分析主机时钟相对漂移,建立了主机时钟相对漂移的线性模型,并由此推导出单向延迟修正模型。通过局域网范围内的主机时钟相对漂移和东南大学和瑞士之间的国际信道两端主机时钟漂移建立模型发现,相对漂移线性模型能很好地反映时钟漂移现象,并能够对两主机间的单向延迟进行修正。以相对时钟代替绝对时钟大大提高了时钟测量精度,减少了时钟同步的次数,降低了网络带宽的负担和主机资源的利用。

A Relative Offset Model on Network Host Clock

Clock synchronization between different computers is a very important factor on network measurement ,net-work management.Because it is necessity to exist the clock offset between different computer clocks,so it is very diffi-cult to precisely synchronize the computer clock continuously.In the paper,the absolute clock is replaced from the rela-tive clock.On the basis of analyzing computer clock offset,the linearity model of computer clock relative-offset is built,and a corrected model of one-way delay is deduced.The relative-offset model is applied to analyze a team of offset da-ta in the area of local area network,and the corrected model of one-way delay is modeled to correct the end-to-end one-way,delay the Internet computer clock between Southeast University and Switzerland.The research result shows that the clock relative-offset model can model the relative offset of different computer clock precisely,and can correct the measuring error of one-way delay between computers.The clock relative-offset model have the advantages that are to in-crease the precise of clock measurement ,decrease the times of clock synchronization,and reduce the network bandwidth and computer resource.