Time-divided communications in a metering system

• US 8,531,311 B2
• Filed: 01/29/2009
• Issued: 09/10/2013
• Est. Priority Date: 01/29/2009
• Status: Active Grant

• Current Assignee: Itron, Inc.
• Original Assignee: Itron, Inc.
• Inventors: Cornwall, Mark, Johnson, Matthew
• Primary Examiner(s): Barnie, Rexford
• Assistant Examiner(s): CLARK, CHRISTOPHER JAY
• Application Number:
  US12/362,443
• Publication Number:
  US 20100188258A1
• Time in Patent Office: 1,685 Days
• Field of Search: 340/870.02, 340/870.12, 340/870.13
• US Class Current: 340/870.02
• CPC Class Codes: G01D 4/006 Remote reading of utility meters to a non-fixed location, i.e. mobile location
• CPC Class Codes: Y02B 90/20 Smart grids as enabling technology in buildings sector smart grids supporting the management or operation of end-user stationary applications in general, or like technologies with no associated climate change mitigation effect Y04S20/00
• CPC Class Codes: Y04S 20/30 Smart metering, e.g. specially adapted for remote reading

Abstract

A method, system, and related apparatus for performing time-divided communications in a metering environment are disclosed. In one embodiment, an endpoint (e.g., ERT) is provided that implements a method for communicating messages with a remote device. Generally, the method includes causing the endpoint to transmit a standard meter reading message within a predefined frequency band. Then, after waiting a predetermined amount of time, a receiver on the endpoint is activated to listen for a message transmitted by the remote device. While the receiver on the endpoint is activated, the endpoint may receive a command from the remote device without being required to transmit an additional standard meter reading message.

Claims

1. An endpoint operative to perform a method for exchanging time-divided communications with a remote device, the method comprising:

within a predefined frequency band, transmitting a standard meter reading having data defined in accordance with a metering protocol;

after a first period of time defined in the metering protocol has elapsed, activating a receiver to listen for a message on a designated channel that is known by the remote device;

receiving a message from the remote device having a command to execute instructions, wherein the message includes a data item that indicates whether the command is designated as a linked command;

transmitting a response message responsive to the command; and

when the command is designated as a linked command, activating the receiver after a second period of time defined in the metering protocol has elapsed.

2. The endpoint of claim 1, wherein the designated channel is identical to a channel utilized for transmitting the standard meter reading.

3. The endpoint of claim 1, wherein the designated channel is different than a channel utilized for transmitting the standard meter reading.

7. The endpoint of claim 1, wherein the command instructs the endpoint to re-program a frequency hopping table that provides frequencies at which meter reading transmissions are transmitted.

8. The endpoint of claim 1, wherein the command instructs the endpoint to modify a packet format in which data is encapsulated for network transmission.

9. The endpoint of claim 1, wherein the standard meter reading is encapsulated in a packet, the packet containing one or more data elements that allow the remote device to identify one or more capabilities of the endpoint.

10. The endpoint of claim 9, wherein the command to execute instructions is created by the remote device based on the one or more capabilities of the endpoint.

11. The endpoint of claim 9, wherein the one or more data elements are included in a preamble portion of the packet and indicate whether the endpoint is only capable of performing simplex communications.

12. The endpoint of claim 1, wherein the first period of time defined in the metering protocol is at least one second in length.

13. The endpoint of claim 1, wherein the second period of time is measured with respect to the transmission of the standard meter reading.

14. The endpoint of claim 1, wherein the endpoint does not activate the receiver after transmitting the response message when the command is not designated as linked.

4. A system for performing time-divided communications over a shared communication medium, the system comprising:

a collector capable of monitoring a set of transmission channels for data indicative of a standard meter reading, receiving a standard meter reading over a channel that is being monitored, determining whether to issue a command to an endpoint that generated the standard meter reading; and

an endpoint for transmitting a standard meter reading over the channel, activating a receiver to listen for a message transmitted over a designated channel once a first pre-determined amount of time from the transmission of the standard meter reading has elapsed, and receiving a message on the designated channel transmitted by the collector;

wherein the collector is configured to transmit a command to execute instructions to the endpoint after the first pre-determined amount of time from the transmission of the standard meter reading has elapsed and before receiving any further message from the endpoint, the command including a data item indicating whether the command is designated as linked; and

wherein the endpoint is to transmit a response message responsive to the command and, when the command is designated as linked, to activate the receiver to listen for a second message after a second pre-determined amount of time from the transmission of the response message.

5. The system of claim 4, wherein the designated channel is identical to the channel utilized for transmitting the standard meter reading.

6. The system of claim 4, wherein the designated channel is different than the channel utilized for transmitting the standard meter reading.

15. The system of claim 4, wherein the collector is to designate the command as linked when the collector anticipates exchanging a sequence of messages with the endpoint.

16. The system of claim 15, wherein the standard meter reading is encapsulated in a packet, the packet containing one or more data elements that allow the collector to identify one or more capabilities of the endpoint, and wherein the collector is to determine whether it anticipates exchanging a sequence of messages with the endpoint based on the one or more capabilities.

17. A method of operating a collector to exchange time-divided communications with an endpoint, the method comprising:

receiving a standard meter reading from the endpoint;

determining how many pending commands exist for the endpoint; and

after a pre-determined period of time from the transmission of the standard meter reading by the endpoint, sending a message to the endpoint that includes a first command, the message including a data item that indicates whether the first command is designated as linked;

wherein the first command is designated as linked when the collector determines that a plurality of pending commands exist for the endpoint.

18. The method of claim 17, wherein the first command is not designated as linked when the collector determines that a single pending command exists for the endpoint, the first command being the single pending command.

19. The method of claim 17, wherein determining how many pending commands exist for the endpoint comprises performing a lookup with respect to a data store maintained at a host computing system.

20. The method of claim 17, further comprising:

prior to determining how many pending commands exist for the endpoint, determining whether the endpoint is configured to satisfy commands based on data included in a packet that encapsulates the standard meter reading; and

terminating the method prior to determining how many pending commands exist for the endpoint when the endpoint is not configured to satisfy commands.