Data processing: measuring – calibrating – or testing – Measurement system – Statistical measurement
Reexamination Certificate
2006-04-11
2006-04-11
Bui, Bryan (Department: 2863)
Data processing: measuring, calibrating, or testing
Measurement system
Statistical measurement
C702S179000, C702S187000, C709S201000
Reexamination Certificate
active
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Marcos K. Aguilera and Jeffrey C. Mogul, entitled “Analysis Of Causal Relations Between Intercommunicating Nodes”, unpublished.
Aguilera Marcos Kawazoe
MacCormick John Philip
Bui Bryan
Lange Richard P.
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