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1. (WO2013158149) MEASUREMENT OF CLOCK SKEW BETWEEN TWO REMOTE HOSTS CONNECTED THROUGH COMPUTER NETWORKS

Pub. No.:    WO/2013/158149    International Application No.:    PCT/US2012/065902
Publication Date: Fri Oct 25 01:59:59 CEST 2013 International Filing Date: Tue Nov 20 00:59:59 CET 2012
IPC: H04J 3/06
Applicants: NEW JERSEY INSTITUTE OF TECHNOLOGY
Inventors: ROJAS-CESSA, Roberto
SALEHIN, Khondaker, M.
Title: MEASUREMENT OF CLOCK SKEW BETWEEN TWO REMOTE HOSTS CONNECTED THROUGH COMPUTER NETWORKS
Abstract:
Technologies are generally described for measuring clock skew between two remote hosts connected through a computer network. According to some examples, pairs of probe packets, also referred to as a compound probe, may be transmitted over an end-to-end path in both directions (forward and reverse paths) to measure a gap value at the end nodes for clock skew estimation. Compound probes may arrive at the end nodes with a zero dispersion gap (no separation) and the gap values along the forward and reverse paths may be determined by a capacity of the links connected to the end nodes added to the clock speeds of the measuring nodes upon arriving at the end nodes. The link capacity is a constant network parameter. Thus, the ratio of the measured gap values may provide an estimate of clock speed discrepancy between the end nodes.