Method and apparatus for estimating time delays in systems...

Data processing: measuring – calibrating – or testing – Measurement system – Statistical measurement

Reexamination Certificate

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C702S179000, C702S187000, C709S201000

Reexamination Certificate

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07027951

ABSTRACT:
A method for calculating a probability distribution that represents probabilities of occurrence of time differences between causally related incoming messages and outgoing messages of a node in a system of communicating nodes is described. The method comprises obtaining a set of time differences between times at which incoming messages arrive at a node and times at which outgoing messages leave the node, the set of time differences including time differences between causally related incoming messages and outgoing messages and time differences between incoming messages and outgoing messages that are not causally related. The method also comprises processing the set of time differences using a statistical estimation algorithm to calculate the probability distribution that represents probabilities of occurrence of time differences between causally related incoming messages and outgoing messages. An apparatus configured to execute the methods is also described.

REFERENCES:
patent: 6223286 (2001-04-01), Hashimoto
patent: 2003/0152110 (2003-08-01), Rune
patent: 2004/0111706 (2004-06-01), Mogul
Marcos K. Aguilera et al, Performance Debugging For Distributed Systems Of Black Boxes, Proceedings of 19th ACMSymposium on Operating Systems Principles, Bolton Landing, NY, Oct. 2003, 16 pages, Association For Computing Machinery (ACM).
Todd K. Moon, The Expectation—Maximization Algorithm, IEEE Signal Processing Magazine, Nov. 1996, pp. 47-60.
U.S. Appl. No. 10/601,371, filed Jun. 23, 2003, inventors: Marcos K. Aguilera and Jeffrey C. Mogul, entitled “Analysis Of Causal Relations Between Intercommunicating Nodes”, unpublished.

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