Method for estimating offset for clocks at network elements

Details Method for estimating offset for clocks at network elements Method for estimating offset for clocks at network elements

2007-08-14

2007-08-14

Marcelo, Melvin (Department: 2616)

Multiplex communications

Communication techniques for information carried in plural...

Combining or distributing information via time channels

C370S509000, C370S516000

Reexamination Certificate

active

10261252

ABSTRACT:
A new algorithm for clock offset estimation for resources distributed across a network (such as the Internet). By exchanging a sequence of time-stamped messages between pairs of network nodes and separately estimating variable delays for each message direction, present inventive embodiments provide more accurate estimates for clock offset between node pairs. Present inventive algorithms operate in a variety of peer and server network configurations while providing significant improvement in convergence speed and accuracy.

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D.L. Mills, “Improved Algorithms for Synchronizing Computer Network Clocks,” IEEE/ACM Trans. on Networking, vol. 3, No. 3, Jun. 1995.
V. Paxson, “On Calibrating Measurements of Packet Transit Times,” “Longer Version,” from ftp://ftp.ee.lbl.gov/papers/vp-clocks-sgmetrics98ps.gz, Mar. 1998.
V. Paxson, “On Calibrating Measurements of Packet Transit Times,” “Shorter Version,” from Proc. SIGMETRICS '98.

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