单向时延测量的时钟同步技术及测量方法  

Clock Synchronization Technology and Measuring Methods for the One-way Transmit Time

作　　者：李波[1] 张新有[1] 

机构地区：[1]西南交通大学信息科学与技术学院,成都610031

出　　处：《小型微型计算机系统》2013年第8期1954-1958,共5页Journal of Chinese Computer Systems

基　　金：国家自然科学基金-联合基金项目(U0970122)资助

摘　　要：单向时延测量是分析和评价网络端到端性能的重要参数,主机之间的时钟偏移和时钟频差会给单向时延测量引入不可忽视的误差.针对传统消除时钟频差中线性规划法对误差判别和处理数据量的不足,提出了极限类比的方法来估计时钟频差系数,并采用类PTP技术构造时钟同步来消除时钟偏移对测量结果的影响,本方法相比传统线性规划法有计算复杂度小、计算快捷的优点,在网络时延固定变化时,该方法更能准确反映网络时延变化,最后针对实际的网络时延测量结果进行了分析,验证了该方法的通用性和可行性.：One-way Transmit Time is one of important parameters to analysis and evaluate the end to end performance of the network, the clock skew and the clock frequency difference will cause great error at One-way Transmit Time measurement. For the insufficient in error identification and data processing of the Liner programming algorithm which for eliminate the clock frequency difference, pro- posed the method of Limit Analogy to estimate the coefficient of clock frequency difference and constructed the clock synchronization which used PTP technology to eliminate the effect that caused by the clock skew. This method have the advantages with simple com- putational complexity and shortcut calculation, when the network delay fixed changes, this method could reflects the network delay variation more accurately. At last, the testing results based on the actual network environment were analyzed and verified the feasibili- ty and the versatility of the method.

关 键 词：时钟频差 时钟偏移 PTP 极限类比 

分 类 号：TP393[自动化与计算机技术—计算机应用技术]