Monitoring of periodic patterns

• US 5,768,284 A
• Filed: 12/29/1995
• Issued: 06/16/1998
• Est. Priority Date: 12/29/1995
• Status: Expired due to Term

• Current Assignee: AT&T Corporation (AT&T, Inc.)
• Original Assignee: AT&T Corporation (AT&T, Inc.)
• Inventors: Cox, Ross Mitchell
• Primary Examiner(s): Chung, Phung M.
• Application Number:
  US08/581,651
• Time in Patent Office: 900 Days
• Field of Search: 371/5.1, 371/48, 371/69.1, 371/67.1, 360/32, 360/5, 341/122, 379/113, 379/309, 395/211, 395/232
• US Class Current: 379/114.04
• CPC Class Codes: H04M 15/00 Arrangements for metering, time-control or time indication ; Metering, charging or billing arrangements for voice wireline or wireless communications, e.g. VoIP
• CPC Class Codes: H04M 3/10 Providing fault- or trouble-signals
• CPC Class Codes: H04M 3/22 Arrangements for supervision, monitoring or testing
• CPC Class Codes: H04M 3/36 Statistical metering, e.g. recording occasions when traffic exceeds capacity of trunks

Abstract

The invention features an apparatus and method for detecting recording errors in a telephone network that provides services to a plurality of customers, the method comprising: recording information output by the telephone network relating to the provision of a service to the customers, the information having a periodic pattern; identifying disturbances in the periodic pattern that persist for longer than a predetermined time period; and generating an alarm when the identified disturbances exceed a threshold. Th invention also features using a model to generate a forecast of information that will be output by the network in a time period that has not yet occurred utilizing information recorded during a previous time period, the model including a plurality of states representing disturbances in the periodic pattern, each state representing a disturbance having a different persistence. The system obtains information output by the telephone network relating to the provision of the service to the customers during a time period; compares the forecast with the information obtained during the time period to generate a deviation; uses the deviation to update each of the states; and generates an alarm when a selected one of the states exceeds a threshold.

Claims

1. A method for detecting recording errors in a telephone network that provides services to a plurality of customers, said method comprising:

recording information output by said telephone network relating to the provision of a service to said customers, said information having a periodic pattern;

identifying disturbances in said periodic pattern that persist for longer than a predetermined period based on current knowledge of said information and on knowledge of a history of said information derived over a plurality of periods; and

generating an alarm when said identified disturbances exceed a threshold.

2. A method for detecting recording errors in a telephone network that provides services to a plurality of customers, said method comprising:

recording information output by said telephone network in a first time period relating to the provision of a service to said customers, said information having a periodic pattern;

using a model to generate a forecast of information that will be output by said network in a second time period that has not yet occurred utilizing said information recorded during said first time period, said model including a plurality of states representing disturbances in said periodic pattern, each said state representing a disturbance having a different persistence;

obtaining information output by said telephone network relating to the provision of said service to said customers during said second time period;

comparing said forecast with the information obtained during said second time period to generate a deviation;

using said deviation to update each of said states; and

generating an alarm when a selected one of said states exceeds a threshold.

3. The method of claim 2 wherein said selected one of said states is a state having a longer persistence than any of said other states.

4. The method of claim 2 wherein said recorded information is a ratio of calls connected in said network to calls disconnected in said network over a predetermined time period.

5. The method of claim 2 wherein said recorded information is the volume of calls made in said network over a predetermined time period.

6. The method of claim 2 wherein said step of using a model to generate a forecast comprises utilizing information recorded prior to said first time period in addition to utilizing information recorded in said first time period.

7. The method of claim 2 further comprising the steps of:

forecasting, utilizing said information recorded during said second time period and information recorded prior to said second time period, the expected content of information that will be output by said network for a third time period that has not yet occurred;

recording information output by said telephone network relating to the provision of said service to said customers in said third time period; and

comparing the result of said step of forecasting associated with said third time period with the information recorded during said third time period to generate a second deviation.

8. The method of claim 7 further comprising the steps of:

using said second deviation to update each of said states; and

generating an alarm when a selected one of said states exceeds a threshold.

9. The method of claim 2 wherein said steps are carried out for a plurality of services provided by said network.

10. The method of claim 2 wherein each of said steps are iteratively repeated to continually generate deviations corresponding to a comparison of data recently output by said network and a forecast for said recently output data, and wherein said states are iteratively updated and alarms are generated if a selected updated state exceeds a threshold.

11. The method of claim 2 further comprising the step of updating said forecast, said forecast being updated using Kalman filtering.

12. A method for detecting recording errors in a telephone network that provides services to a plurality of customers, said method comprising:

recording information output by said telephone network relating to the provision of a service to said customers, said information having a periodic pattern;

modeling said information using a first state and a second state, said first state representing disturbances in said periodic pattern of a first duration, and said second state representing disturbances in said periodic pattern of a second duration, said second duration being longer than said first duration, and said disturbances based on current knowledge of said information and on knowledge of a history of said information derived over a plurality of periods; and

generating an alarm when a disturbance in said second state exceeds a threshold.

13. The method of claim 12, further comprising the steps of:

using said first and second states to generate a forecast of information that will be output by said telephone network for a time period that has not yet occurred;

recording information output by said telephone network during said time period; and

comparing the result of said forecasting step with the information recorded during said time period to generate a deviation.

14. The method of claim 13 further comprising the step of using said deviation to update each of said steps.

15. A method for detecting recording errors in a telephone network that provides services to a plurality of customers, said method comprising:

recording information output by said telephone network relating to the provision of a service to said customers, said information having a periodic pattern;

identifying disturbances in said periodic pattern of a first duration based on current knowledge of said information and on knowledge of a history of said information derived over a plurality of periods;

identifying disturbances in said periodic pattern of a second duration based on current knowledge of said information and on knowledge of a history of said information derived over a plurality of periods, said second duration being longer than said first duration;

generating an alarm when said disturbance of said second duration exceeds a threshold.

16. A method for detecting recording errors in a telephone network that provides services to a plurality of customers, said method comprising:

(a) recording information output by said telephone network relating to the provision of a service to said customers in a first time period;

(b) modeling said information recorded in said first time period using a first state and a second state, said first state representing disturbances in said information of a first persistence and said second state representing disturbances in said information of a second persistence, said second persistence being longer than said first persistence;

(c) using said first and second states to generate a forecast of information to be output by said network for a future time period;

(d) recording, during the occurrence of said future time period, information output by said telephone network relating to the provision of said service to said customers;

(e) comparing the forecast generated in step (c) with the information recorded in step (d) to generate a deviation;

(f) updating each of said states based on said deviation generated in the preceding step;

(g) generating an alarm when a selected one of said states exceeds a threshold; and

(h) iteratively repeating steps (c)-(g) to continually generate alarms whenever said selected one of said states exceeds said threshold.

17. The method of claim 16 wherein said selected one of said states is said second state.

18. A system for detecting recording errors in a telephone network that provides services to a plurality of customers, said system comprising:

an information recorder for recording information output by said telephone network relating to the provision of a service to said customers, said information having a periodic pattern;

apparatus for identifying disturbances in said periodic pattern that persist for longer than a predetermined time period based on current knowledge of said information and on knowledge of a history of said information derived over a plurality of periods; and

an alarm generator for generating an alarm when said identified disturbances exceed a threshold.

19. A system for detecting recording errors in a telephone network that provides services to a plurality of customers, said system comprising:

an information recorder for recording information output by said telephone network in a first time period relating to the provision of a service to said customers, said information having a periodic pattern;

a model for generating a forecast of information that will be output by said network in a second time period that has not yet occurred utilizing said information recorded during said first time period, said model including a plurality of states representing disturbances in said periodic pattern, each said state representing a disturbance having a different persistence;

apparatus for obtaining information output by said telephone network relating to the provision of said service to said customers during said second time period;

a comparator for comparing said forecast with the information obtained during said second time period to generate a deviation, said deviation used to update each of said states; and

an alarm generator for generating an alarm when a selected one of said states exceeds a threshold.

20. The apparatus of claim 19 wherein said selected one of said states is a state having a longer persistence than any of said other states.

21. The apparatus of claim 19 wherein said recorded information is a ratio of calls connected in said network to calls disconnected in said network over a predetermined time period.

22. The apparatus of claim 19 wherein said recorded information is a volume of calls made in said network over a predetermined time period.

23. The apparatus of claim 19 wherein said forecast is generated utilizing information recorded prior to said first time period in addition to utilizing information recorded in said first time period.