Patent ID: 8468234
Filing Date: 2013-06-18
Classification: H04L

Abstract:
1. A processor-implemented method of tracking routing of traffic on a network, comprising: tracking times of arrival data; transforming said times of arrival into time-series; determining a frequency corresponding to traffic to be tracked, wherein determining the frequency comprises: parsing said time-series into windows, obtaining Lomb periodograms for said windows, comparing peak frequencies in successive ones of said periodograms for a sender node to determine if one of said periodograms includes a peak above a threshold at a first frequency different from said peak frequencies in a preceding one of said periodograms, determining if at least one peak above said threshold at said first frequency occurs in one of a predetermined number of previous periodograms for said sender node, determining if said at least one peak at said first frequency occurs in at least one of a specified number of periodograms obtained at a receiver node for other sender nodes of said network, using said first frequency to position a band-pass filter when said at least one peak at said first frequency does not occur in one of said predetermined number of previous periodograms for said sender node and when said at least one peak at said first frequency occurs in at least one of said specified number of periodograms obtained at said receiver node for other sender nodes of said network; presenting spatially separated signals corresponding to the time-series of traffic on spatially separated links of said network to the band-pass filter to obtain spatially separated band-limited signals, the band pass filter centered substantially about the determined frequency; determining by a processor coherence values of said spatially separated band-limited signals, each coherence value corresponding to at least two spatially separated links in said network; and based on a comparison of said coherence values of said spatially separated band-limited signals to a threshold forming at least one map of said routing of said traffic based on the corresponding spatially separated links.