Discovery phase in a frequency hopping network

• US 7,986,718 B2
• Filed: 09/10/2007
• Issued: 07/26/2011
• Est. Priority Date: 09/15/2006
• Status: Active Grant

• Current Assignee: Itron Global Sarl (Itron, Inc.)
• Original Assignee: Itron, Inc.
• Inventors: Monier, Fabrice
• Primary Examiner(s): CHRISS, ANDREW W
• Application Number:
  US11/900,199
• Publication Number:
  US 20080095075A1
• Time in Patent Office: 1,415 Days
• Field of Search: 370/503
• US Class Current: 370/509
• CPC Class Codes: G01D 4/004 Remote reading of utility meters to a fixed location
• CPC Class Codes: G01D 4/006 Remote reading of utility meters to a non-fixed location, i.e. mobile location
• CPC Class Codes: G08C 19/16 in which transmission is by pulses
• CPC Class Codes: H04B 1/7143 Arrangements for generation of hop patterns
• CPC Class Codes: H04B 17/318 Received signal strength
• CPC Class Codes: H04B 7/15 Active relay systems
• CPC Class Codes: H04L 45/127 based on intermediate node capabilities
• CPC Class Codes: H04W 40/005 Routing actions in the presence of nodes in sleep or doze mode
• CPC Class Codes: H04W 40/10 based on available power or energy
• CPC Class Codes: H04W 40/22 using selective relaying for reaching a BTS [Base Transceiver Station] or an access point
• CPC Class Codes: H04W 40/248 Connectivity information update
• CPC Class Codes: H04W 48/12 using downlink control channel
• CPC Class Codes: H04W 56/00 Synchronisation arrangements
• CPC Class Codes: H04W 56/0015 one node acting as a reference for the others
• CPC Class Codes: H04W 56/002 Mutual synchronization
• CPC Class Codes: H04W 8/005 Discovery of network devices, e.g. terminals
• CPC Class Codes: H04W 84/18 Self-organising networks, e.g. ad-hoc networks or sensor networks
• CPC Class Codes: H10N 70/8418 adapted for focusing electric field or current, e.g. tip-shaped
• 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

The present technology relates to protocols relative to utility meters associated with an open operational framework. More particularly, the present subject matter relates to protocol subject matter for advanced metering infrastructure, adaptable to various international standards, while economically supporting a 2-way mesh network solution in a wireless environment, such as for operating in a residential electricity meter field. The present subject matter supports meters within an ANSI standard C12.22/C12.19 system while economically supporting a 2-way mesh network solution in a wireless environment, such as for operating in a residential electricity meter field, all to permit cell-based adaptive insertion of C12.22 meters within an open framework. Particular present features relate to operation at the node level of a Discovery Phase in a frequency hopping network.

Claims

1. A method for enabling a newly installed network end device to establish a link to an existing advanced metering system frequency hopping network, comprising:

establishing a network including a central facility and a plurality of end devices, at least some of which end devices comprise metrology devices;

configuring the network for bi-directional communications between the central facility and each of the plurality of end devices;

causing a newly installed end device to transmit a discovery beacon, the discovery beacon including information as to a specific listening channel on which the newly installed end device will listen during a listening window;

configuring selected of the plurality of end devices to transmit a response to a received discovery beacon;

placing the newly installed end device in a listen mode during a listening window on the listening channel specified in the transmitted discovery beacon;

configuring the newly installed end device to collect and store information transmitted from one or more of the plurality of end devices in response to the discovery beacon; and

configuring the newly installed end device to synchronize with a preferred network based on the lowest number of end points within a cell of end points.

2. A method as in claim 1, further comprising configuring the plurality of end devices to transmit messages in response to a discovery beacon at random times within the listening window on the listening frequency specified in the discovery beacon.

3. A method as in claim 2, wherein the plurality of end devices are configured to transmit response messages including time, frequency, and network identifier information.

4. A method as in claim 2, further comprising configuring the plurality of end devices to transmit messages in response to a discovery beacon only when such end device is synchronized to the network.

5. A method as in claim 2, further comprising causing a newly installed end device to transmit discovery beacons over several hopping channels in succession prior to entering a listening mode.

6. A method as in claim 5, further comprising:

randomly selecting one of the hopping channels as a first of the several hopping channels on which to transmit a discovery beacon; and

specifying the randomly selected hopping channel as the listening channel.

7. A method as in claim 6, further comprising causing the newly installed end device to repeatedly transmit discovery beacons starting at the channel in a hopping sequence following the previously specified listening channel, upon failure to receive a response to a previously transmitted discovery beacon.

8. A method as in claim 7, further comprising delaying transmission of repeated discovery beacons for a randomly selected time period.

9. A method as in claim 8, further comprising increasing the randomly selected time period upon repeated failure to receive a valid response to a discovery beacon.

10. A method for enabling a newly installed network end device to establish a link to an existing advanced metering system frequency hopping network, comprising:

establishing a network including a central facility and a plurality of end devices, at least some of which end devices comprise metrology devices;

configuring the network for bi-directional communications between the central facility and each of the plurality of end devices;

causing a newly installed end device to transmit a discovery beacon, the discovery beacon including information as to a specific listening channel on which the newly installed end device will listen during a listening window;

configuring selected of the plurality of end devices to transmit a response to a received discovery beacon;

placing the newly installed end device in a listen mode during a listening window on the listening channel specified in the transmitted discovery beacon;

configuring the newly installed end device to collect and store information transmitted from one or more of the plurality of end devices in response to the discovery beacon;

configuring the newly installed end device to synchronize with a preferred network based on any collected information in accordance with predetermined criteria; and

causing a newly installed end device to transmit discovery beacons over several hopping channels in succession prior to entering a listening mode and;

including in the discovery beacons the number of remaining discovery beacons to be sent.

11. A method as in claim 10, further comprising configuring the newly installed end device to synchronize with a preferred network based on the received signal strength of a valid response message.

12. An advanced metering system frequency hopping network, comprising:

a central facility;

a plurality of end devices, at least some of which end devices comprise metrology devices, with said central facility and said plurality of end devices being configured for bi-directional communications therebetween; and

at least one device configured to attempt to establish a link to at least one of said plurality of end devices in accordance with predetermined criteria;

wherein said at least one device is configured to attempt to establish a link by transmitting a plurality of discovery beacons on successive hopping channels, each beacon including information as to a specific channel on which said at least one device will listen during a listening window, and as to the number of remaining beacons to be transmitted.

13. An advanced metering system as in claim 12, wherein selected of said plurality of end devices are configured to respond to a transmitted discovery beacon by transmitting a response message including time, frequency, and network identifier information.

14. An advanced metering system as in claim 13, wherein said selected plurality of end devices configured to respond to a transmitted discovery beacon are further configured to respond at random times within a listening window on the frequency specified in said discovery beacon.

15. An advanced metering system as in claim 14, wherein said selected plurality of end devices are configured to response to a discovery beacon only when such end device is synchronized to the network.

16. An advanced metering system as in claim 12, wherein said at least one device is configured to randomly select one of said hopping channels as a first of the successive channels on which to transmit a discovery beacon and is further configured to specify said randomly selected channel as said listening channel.