Measuring One-way Delay with Multiple Clock Dynamics
A key issue in one-way metrics measurement is the removal of relative clock offset in the situation of without external clock synchronization mechanisms for the end-to-end hosts. The relative clock offset is resulted from clock dynamics including clock adjustment, frequency adjustment and clock drift. Many efforts have been done on the removal of clock skew (related to frequency) in OWD measurement. Most researches are based on the assumption that the clock skew retains constant and without clock adjustments and drifts during measurement.But this does not hold according to our practical measurements and other work1. In fact, it is found that hosts clocks might be subject to gradual or instantaneous clock adjustments and frequency adjustments in operation.In this paper, with the time series segmentation technology,we discuss the detection of clock dynamics in OWD measurement. A algorithm is proposed to estimate the relative clock offset with only unidirectional probe packets.Experiments results show that the algorithm can provide reasonable clock dynamics detection and informative OWD estimation.
One way metrics Clock Dynamics Network Measurement Time series segmentation
Junfeng Wang Jianhua Yang Hongxia Zhou Gaogang Xie Mingtian Zhou
College of Computer Science & Engineering, University of Electric Science & Technology of China, Che Network Research Division, Institute of Computing Technology,Chinese Academy of Science, Beijing, Ch College of Electronic Engineering, University of Electric Science & Technology of China, Chengdu, 61
国际会议
成都
英文
424-429
2003-08-27（万方平台首次上网日期，不代表论文的发表时间）