Clock offset estimation with bias correction

Details Clock offset estimation with bias correction Clock offset estimation with bias correction

2006-04-04

2006-04-04

Patel, Ajit (Department: 2664)

Multiplex communications

Communication techniques for information carried in plural...

Combining or distributing information via time channels

C370S509000

Reexamination Certificate

active

07023884

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 estimates for clock offset between node pairs and the bias of such estimates, thereby to permit more accurate correction. 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.Ibl.gov/papers/vp-clocks-sigmetrics98ps.gz, Mar. 98.
V. Paxson, “On Calibrating Measurements of Packet Transit Times”, “Shorter Version” from Proc. SIGMETRICS '98.

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