Investigating Underestimation Effect of Poisson Sampling on Packet Delay Dynamics Based on Simulation
L. Y. Zhong · Jisuanji fangzhen · 2006
Sampling technique is elemental and important for network measurement.It is traditionally believed that Poisson sampling is unbiased,which makes it being widely used in network active measurement area.And it is well known that the unbiased estimation of Poisson sampling is true when network state is considered.As it is coming to be an important problem to measure the packet performance of user flow,there are not empirical efforts to investigate the performance of Poisson sampling on packet performance measurement from user's view.By using various actual Internet traffic datasets in simulation experiment,the difference of packet delay statistics between Poisson sampling results and user flow was systemically investigated.Poisson sampling systematically underestimates the statistics of packet delay,and the error degree decreases with the increasing of system utilization and has no relation with the frequency of Poisson sampling.Then the reason of above simulation results was analyzed.