Diagnostic apparatus

Patent metadata

Field	Value
Publication number	US-2021328861-A1
Application number	US-201917274365-A
Country	US
Kind code	A1
Filing date	Aug 26, 2019
Priority date	Sep 10, 2018
Publication date	Oct 21, 2021
Grant date	—

Abstract

A fault diagnosis unit (42) of a fault diagnosis apparatus (4) performs a fault diagnosis of a communication network (2) with a probabilistic inference algorithm using information on the communication network (2) having been gathered by an NW monitoring unit (41). A diagnosis result determining unit (43) determines test items for confirming and determining a diagnosis result of the fault diagnosis. A test performing unit (44) performs a confirmation test of the determined test items. The diagnosis result determining unit (43) determines a likelihood of the diagnosis result of the fault diagnosis based on a result of the confirmation test.

First claim

1 . A diagnostic apparatus, comprising:
a processor; and a storage medium having computer program instructions stored thereon, when executed by the processor, perform to: estimate a state of a diagnostic target using a probabilistic inference algorithm having one or more probabilistic inference steps; performs a verification test for verifying the estimated state; and determines a likelihood of the estimated state based on a test result of the verification test.

2 . The diagnostic apparatus according to claim 1 , wherein the computer program instructions further perform to, upon a determination that there is a difference between a state of the diagnostic target obtained based on the test result of the verification test and the estimated state, makes a transition to the probabilistic inference step in which the difference had occurred and estimate a state of the diagnostic target.

3 . The diagnostic apparatus according to claim 1 , wherein the computer program instructions further perform to, upon a determination that there is a difference between a state of the diagnostic target obtained based on the test result of the verification test and the estimated state, corrects a probability of reaching the estimated state so as to match the test result from the probabilistic inference step in which the difference had occurred.

4 . The diagnostic apparatus according to claim 1 , wherein the probabilistic inference algorithm is a state estimation algorithm that uses a Bayesian network.

5 . The diagnostic apparatus according to claim 1 , comprising a plurality of combinations of one or more of the state estimating units, one or more of the test performing units, and one or more of the determining units, and further comprising an overall determining unit that determines the state of the diagnostic target using a state estimated by a state estimating unit and a result of a determination made with respect to the state by a determining unit in each of the combinations.

6 . The diagnostic apparatus according to claim 1 , wherein the diagnostic target is a communication network, and the computer program instructions further estimates a state in which a fault has occurred in the communication network.

Assignees

• Nippon Telegraph & Telephone

Inventors

• Oda Takuya
• KOBAYASHI Shokei
• Hirano Akira

Classifications

• G06N7/01

  Probabilistic graphical models, e.g. probabilistic networks · CPC title

• G01R31/318566

  Comparators; Diagnosing the device under test · CPC title

• G01R31/002

  where the device under test is an electronic circuit · CPC title

• H04L43/50 Primary

  Testing arrangements · CPC title

• H04L41/0677

  Localisation of faults · CPC title