Sequence inversion keyed countdown timer utilized within a utility meter system

• US 20050052288A1
• Filed: 07/28/2004
• Published: 03/10/2005
• Est. Priority Date: 09/05/2003
• Status: Active Grant

• Current Assignee: Itron, Inc.
• Original Assignee: Itron, Inc.
• Inventors: Osterloh, Christopher L., Nagy, Christopher
• Granted Patent: US 7,372,372 B2
• Time in Patent Office: Days
• US Class Current: 340/870.20
• CPC Class Codes: G06Q 50/06 Energy or water supply
• CPC Class Codes: H04Q 2209/60 for transmitting utility meters data, i.e. transmission of data from the reader of the utility meter

Abstract

An automatic meter reading system that includes a head end controller and an endpoint that is interfaced to a utility meter. The head end controller and the endpoint communicate via RF communication. The endpoint includes an internal clock that synchronizes itself to a clock countdown signal. The clock countdown signal is generated by the head end controller through use of sequence inversion keying.

Claims

1. An automatic meter reading (AMR) system, comprising;

a head end controller;

an endpoint interfaced to a utility meter, wherein said endpoint includes and internal clock, wherein said head end controller is capable of communicating with said endpoint via RF communication, wherein said head end controller generates a clock countdown signal through the use of sequence inversion keying (SIK), and wherein said endpoint synchronizes said internal clock to said clock countdown signal during generation of said clock countdown signal by said head end controller.

2. The system of claim 1, wherein said clock countdown signal is generated for less than 60 seconds for each hour in the day.

3. The system of claim 2, wherein said internal clock is synchronized to said clock countdown signal every hour of the day.

4. The system of claim 1, wherein said internal clock is synchronized to said clock countdown signal at any point during the generation of said clock countdown signal.

5. The system of claim 1, wherein said endpoint is battery powered, and wherein said endpoint operates on said battery for less than 200 milliseconds to synchronize the internal clock to said clock countdown signal.

6. The system of claim 1, wherein said endpoint includes the ability to re-acquire said clock countdown signal from said head end controller should said endpoint lose said head end controller.

7. An automatic meter reading (AMR) system, comprising:

means for interfacing with a utility meter, wherein said means for interfacing includes means for establishing an internal time; and

means for communicating with said means for interfacing via RF communication, wherein said means for communicating additionally for generating a clock countdown signal through the use of sequence inversion keying, wherein said means for establishing an internal time additionally for synchronizing said internal time to said clock countdown signal.

8. The system of claim 7, wherein said means for generating said clock countdown signal generates the signal for less than 60 seconds for each hour in the day.

9. The system of claim 8, wherein said means for establishing an internal time synchronizes every hour of every day.

10. The system of claim 7, wherein said means for establishing an internal time additionally for synchronizing said internal time to said clock countdown signal at point during generation of said clock countdown signal.

11. The system of claim 7, wherein said means for interfacing includes means for independently powering itself, and wherein said means for interfacing utilizes said means for independently powering for less than 200 milliseconds while said means for establishing an internal time synchronizes to said clock countdown signal.

12. The system of claim 7, wherein said means for interfacing additionally for automatically re-acquiring said clock countdown signal from said means for communicating upon said means for interfacing losing communication with said means for communicating.

13. A method for communication in an automatic meter reading system, comprising the steps of:

generating a clock countdown signal through the use of sequence inversion keying (SIK);

transmitting said clock countdown signal via RF communication;

obtaining the transmitted clock countdown signal;

synchronizing a clock to the obtained clock countdown signal; and

time-stamping utility meter data according to a time on the synchronized clock.

14. The method of claim 13, wherein said step of generating a clock countdown signal comprises generating said clock countdown signal for less than 60 seconds for each hour in the day.

15. The method of claim 14, wherein said step of synchronizing comprises synchronizing every hour of every day.

16. The method of claim 13, wherein said step of synchronizing occurs at any point during said step of generating.

17. The method of claim 13, further comprising the step of independently powering said clock, and wherein said step of independently powering occurs for less than 200 milliseconds during said step of synchronizing said clock.