Tracking device that conserves power using a sleep mode when proximate to an anchor beacon

• US 7,639,131 B2
• Filed: 12/18/2006
• Issued: 12/29/2009
• Est. Priority Date: 12/18/2006
• Status: Expired due to Fees

• Current Assignee: Google Technology Holdings LLC (Alphabet Inc.)
• Original Assignee: Motorola, Inc. (Motorola Solutions, Inc.)
• Inventors: Mock, Von A., Eaton, Eric T., Hayes, David J.
• Primary Examiner(s): TRIEU, VAN THANH
• Application Number:
  US11/612,441
• Publication Number:
  US 20080143604A1
• Time in Patent Office: 1,107 Days
• Field of Search: 340/572.1, 340/572.4, 340/573.1, 340/573.4, 340/539.1, 340/539.11, 340/539.13, 340/539.21, 340/539.3, 340/10.1, 235/375
• US Class Current: 340/539.3
• CPC Class Codes: G01S 5/019 Energy consumption
• CPC Class Codes: G08B 13/1427 with transmitter-receiver for distance detection
• CPC Class Codes: G08B 13/2462 Asset location systems combined with EAS inventory, tracking, logistic G06Q10/00; entrance control systems G07C9/00

Abstract

A method for tracking objects in a way that conserves power resources. The method can establish a designed range defining a safe area based upon the broadcast signal of an anchor beacon. When the tracking device is within the designed range, the tracking device can be placed in a mode of low power consumption. Should the tracking device move outside of the designated range, then the tracking device can be placed in mode for active tracking. The level of power consumption can be achieved by only enabling a WAN transceiver in the active tracking mode.

Claims

1. A power conserving tracking system comprising:

at least one anchor beacon configured to broadcast a signal;

a tracking device configured to determine a location of the tracking device using a location detector, said tracking device also comprising a beacon sensor configured to detect the signal broadcast by the beacon, a wireless transceiver configured to wireless exchange messages with a remotely located tracking server, and a power source, the tracking device also has a plurality of power modes, said power modes including at least a low power mode and a high power mode, wherein said low power mode is automatically utilized when the tracking device is within a designated range of at least one anchor beacon, and wherein said high power mode is automatically utilized when the tracking device is outside the designated range.

2. The system of claim 1, wherein when the tracking device is operating in low power mode, the location detector and the wireless transceiver are placed in a sleep state, and wherein when operating in high power mode, the location detector and the wireless transceiver are placed in an active state.

3. The system of claim 1, wherein when operating in the high power mode the tracking device repetitively transmits messages specifying a location of the tracking device to the tracking server, and wherein when operating in low power mode a lesser frequency of transmitted messages are conveyed from the tracking device to the tracking server.

4. The system of claim 3, wherein when operating in the low power mode, no transmitted messages are conveyed from the tracking device to the tracking server.

5. The system of claim 3, wherein the plurality of power modes further comprises a medium power mode, wherein when operating in the medium power mode the tracking device transmits messages specifying a location of the tracking device to the tracking server with a frequency less than a frequency associated with the high power mode and greater than a frequency associated with a low power mode, wherein the medium power mode is automatically utilized when the tracking device is outside the designated range but within a geo fence, and wherein the high power mode is automatically utilized when the tracking device is outside the designated range but outside the geo fence.

6. The system of claim 5, wherein the tracking server is configured to convey commands to the tracking device, which cause the tracking device to change operational power modes in accordance with the commands.

7. The system of claim 5, wherein the geo fence is defined by a location of a mobile device, which is registered with and tracked by the tracking server.

8. The system of claim 1, wherein the tracking server is configured to receive messages from the tracking device and to automatically convey notification messages to a monitoring computing device to inform a user associated with the monitoring computing device whenever the tracking device is located outside the designated range.

9. The system of claim 1, wherein the wireless transceiver is a wide area network (WAN) transceiver that directly connects the tracking device to the tracking server.

10. The system of claim 1, wherein the wireless transceiver is a personal area network (PAN) transceiver that connects to an intermediary computing device, where the intermediary computing device is connected to the tracking server via a wide area network (WAN) connection.

11. A method to track an object comprising:

automatically sensing whether a tracking device is within a designated broadcast range of at least one anchor beacon;

when outside of the designated range, changing a power state of the tracking device to activate an included wide area network transceiver and an included location detector;

when the power state is changed, determining a location of the tracking device using the location detector; and

wirelessly conveying a notification to a predetermined computing device, said notification including the determined location.

12. The method of claim 11, further comprising:

while outside of the designated range, iteratively repeating the determining and the conveying steps.

13. The method of claim 11, wherein the tracking device includes a signal quality threshold, which defines the designated range.

14. The method of claim 11, further comprising:

detecting a proximity between the tracking device and a previously designated safe device while the device is located outside the designated range; and

decreasing a frequency with which location updates are sent from the tracking device to the tracking server based upon the detected proximity.

15. A method for tracking objects in a power conservative fashion comprising:

establishing a designated range based upon a wireless broadcast emitting from at least one anchor beacon;

automatically placing a tracking device in a low power mode when the tracking device is within the designated range; and

automatically placing the tracking device in an high power mode when the tracking device is outside of the designated range, wherein a wireless transceiver within the tracking device repetitively conveys location identifying messages to a tracking server when operating in the high power mode, and wherein messages are not automatically conveyed from the tracking device to the tracking server when operating in low power mode.

16. The method of claim 15, further comprising:

establishing a geo fence boundary;

automatically placing the tracking device in a medium power mode when the tracking device is outside the designated range but contained within the geofence boundary, wherein the wireless transceiver repetitively conveys location identifying messages to the tracking server when operating in medium power mode with a message conveyance frequency than is less than a message conveyance frequency associated with the high power mode.

17. The method of claim 16, wherein the geo fence boundary is based upon a location of a mobile device, whereby the tracking device operates in medium power mode when proximate to the mobile device and when outside the designated range.