Object monitoring, locating, and tracking method employing RFID devices

• US 20070001854A1
• Filed: 08/05/2005
• Published: 01/04/2007
• Est. Priority Date: 08/26/2004
• Status: Active Grant

• Current Assignee: Avante International Technology
• Original Assignee: AII Technology Company Limited (Wistron Corporation)
• Inventors: Li, Jing, Chung, Kevin, Zou, Ming, Shi, Xiaoming, Chu, Cynthia
• Granted Patent: US 7,423,535 B2
• Time in Patent Office: Days
• US Class Current: 340/572.100
• CPC Class Codes: B60R 2325/105 Radio frequency identification data [RFID]
• CPC Class Codes: G08B 13/02 Mechanical actuation
• CPC Class Codes: G08B 13/2417 having a radio frequency identification chip
• CPC Class Codes: G08B 19/00 Alarms responsive to two or more different undesired or abnormal conditions, e.g. burglary and fire, abnormal temperature and abnormal rate of flow

Abstract

A method for monitoring a container having an RFID device interior comprises periodically transmitting messages including unique identifying information and receiving messages transmitted by the RFID device interior the container by a receiving device exterior the container. Some messages transmitted when the container is closed are not received by the receiving device, and some messages transmitted when the container is not closed are received. The method comprises storing and/or relaying the received messages and determining from the number of messages received from the RFID device that are stored and/or relayed whether the container has or has not been opened. The method may also comprise transmitting the messages at two or more power levels and selecting messages that are at the lowest power level that produces at least two corresponding stored and/or relayed messages for determining the location of the RFID device.

Claims

1. A method for monitoring one or more objects each having an RFID device associated therewith, said method comprising:

transmitting at least two messages at two different power levels from the RFID device, wherein each of the at least two messages includes information uniquely identifying the RFID device and information representing the power level at which the message is transmitted;

relaying the at least two messages transmitted by each RFID device to a processor; and

processing the relayed messages for determining the location of each RFID device, said processing comprising;

processing the unique identifying information and the power level information from each relayed message for associating the relayed messages from each RFID device and the power level thereof, and

selecting the relayed messages from a particular RFID device that are at the lowest power level that produces at least two corresponding relayed messages for determining the location of that particular RFID device and its associated object therefrom.

2. The method of claim 1 wherein said relaying further comprises associating identification information, or location information, or date/time information, or any combination of the foregoing, with the messages relayed.

3. The method of claim 2 wherein said processing the relayed messages further includes processing the identification information, or the location information, or the date/time information, or any combination of the foregoing, for determining the location of a particular RFID device.

4. The method of claim 1 wherein said transmitting at least two messages comprises transmitting continuously, or transmitting messages periodically at regular or irregular intervals of time, or transmitting messages at programmable intervals, or transmitting messages at programmable power levels, or transmitting messages responsive to an interrogation signal, or transmitting messages until receipt of an acknowledgment signal, or any combination of the foregoing.

5. The method of claim 1 wherein said selecting the relayed messages further comprises:

defining a radius value representative of the power level of each relayed message; and

for each RFID device, determining the intersection of respective geometric shapes having the defined radius values for locating that particular RFID device in the intersection.

6. The method of claim 5 wherein said selecting the relayed messages further comprises:

if the respective geometric shapes having the defined radius values do not intersect, then proportionately increasing the radius values thereof until the respective geometric shapes do intersect.

7. The method of claim 5 wherein said determining the intersection of respective geometric shapes having the defined radius values comprises:

determining the intersection of first and second ones of the respective geometric shapes having defined radius values;

determining the intersection of a third one of the respective geometric shapes having defined radius value with the intersection of the first and second ones thereof; and

repeating the immediately preceding determining step for each additional one of the respective geometric shapes, if any, until all of the respective geometric shapes for the particular RFID device are used.

8. The method of claim 1 wherein said processing the relayed messages comprises storing in records in a database at least the information contained in the relayed messages and the location information determined for each RFID device from which a relayed message has been received, said method further comprising:

accessing information stored in records of the database via wire, or cable, or telephone, or a radio link, or a network, or the Internet, or an intranet, or a local area network, or a wide area network, or a wireless network, or an ad hoc network, or a satellite, or e-mail, or a computer, or a laptop computer, or a personal digital assistant device, or a Blackberry-enabled device, or a Wi-Fi-enabled device, or a cell phone, or a WAP-enabled cell phone, or a pager, or any combination of the foregoing.

9. A method for monitoring an object having at least one RFID device interior thereto, said method comprising:

periodically transmitting at least two messages at two different power levels from at least one RFID device interior to a closable object;

wherein each of the at least two messages includes information uniquely identifying the RFID device and information representing the power level at which the message is transmitted, and

wherein ones of the periodic messages that are transmitted when the closable object is closed are substantially attenuated by the closable object, and wherein ones of the periodic messages that are transmitted when the closable object is not closed are not substantially attenuated by the closable object;

relaying the received ones of the at least two messages transmitted periodically by each RFID device via at least one relay device exterior the closable object, wherein at least some of the substantially attenuated messages are not received by the relay device; and

processing the relayed messages for determining the location of each RFID device, said processing comprising;

processing the unique identifying information and the power level information from each relayed message for associating the messages from each RFID device and the power level thereof, and

selecting the messages from a particular RFID device at the lowest power level that produces at least two corresponding relayed messages for determining the location of that particular RFID device therefrom, whereby a particular RFID device and its associated object are monitored.

10. The method of claim 9:

wherein said relaying further comprises associating identification information, or location information, or date/time information, or any combination of the foregoing, with the messages relayed; and

wherein said processing the relayed messages further includes processing the identification information, or the location information, or the date/time information, or any combination of the foregoing, for determining the location of a particular RFID device.

11. The method of claim 9 wherein said selecting the relayed messages further comprises:

defining a radius value representative of the power level of each relayed message; and

for each RFID device, determining the intersection of respective geometric shapes having the defined radius values for locating that particular RFID device in the intersection.

12. The method of claim 11 wherein said selecting the relayed messages further comprises:

if the respective geometric shapes having the defined radius values do not intersect, then proportionately increasing the radius values thereof until the respective geometric shapes do intersect.

13. The method of claim 9 wherein said processing the relayed messages further comprises storing in records in a database at least the information contained in the relayed messages and the location information determined for each RFID device from which a relayed message has been received, and further comprising:

locating each RFID device from information contained in the most recent record for that RFID device that is stored in the database;

or

tracking each RFID device from information contained in the accumulated records for that RFID device that are stored in the database;

or

monitoring each RFID device from information contained in at least selected ones of the records for that RFID device that are stored in the database;

or

providing an indication of an opening of an object associated with an RFID device from information contained in the record or records for that RFID device that are stored in the database;

or

any combination of the foregoing.

14. The method of claim 13 further comprising, in addition to providing a given RFID device interior a given closable object, relating a second object RFID device associated with a second object to the given closable object by a predetermined relationship, and storing in the database information relating the given RFID device interior the given closable object and the second object RFID device related thereto.

15. The method of claim 14 wherein the predetermined relationship includes proximity of the second object and the given closable object, or absence of proximity of the second object and the given closable object, or both, and further comprising providing an indication of whether the second object and the given closable object are in the predetermined relationship.

16. The method of claim 9 wherein said relaying further comprises:

establishing an ad hoc network for communicating the messages transmitted by RFID devices for said processing at least two messages.

17. The method of claim 9 wherein the unique identifying information of the RFID device includes a set of a plurality of unique identifiers, one of which unique identifiers is presently included in messages for uniquely identifying the RFID device, said method further comprising:

permanently and irreversibly replacing the presently utilized one of the set of unique identifiers by another unique identifier of the set of unique identifiers for thereafter uniquely identifying the RFID device, whereby the RFID device may be identified by the another unique identifier for reuse.

18. A method for monitoring a container having at least one RFID device interior thereto, said method comprising:

providing an RFID device interior to a closable container, the RFID device periodically transmitting messages;

wherein each of the messages includes information uniquely identifying the RFID device, and

wherein ones of the messages that are transmitted when the closable container is closed are substantially attenuated by the closable container, and wherein ones of the messages that are transmitted when the closable container is not closed are not substantially attenuated by the closable container;

receiving messages transmitted by the RFID device interior the closable container by a receiving device exterior the closable container;

whereby ones of the messages that are transmitted when the closable container is closed are not received by the receiving device, and wherein ones of the messages that are transmitted when the closable container is not closed are received by the receiving device;

storing the received messages in the receiving device, relaying the received messages from the receiving device, or both; and

determining from the number of messages received from the RFID device that are stored or that are relayed, or both, whether the closable container has or has not been opened,

whereby a container having an RFID device therein is monitored for being opened.

19. The method of claim 18 further comprising:

sensing a thing and/or a condition at or proximate the RFID device, and

transmitting data produced by said sensing in a message transmitted by the RFID device, or storing data produced by said sensing in the RFID device, or both.

20. The method of claim 19 wherein said transmitting data produced by said sensing comprises transmitting at a present time, or at a future time, or at a predetermined time, or periodically, or in response to an interrogation signal, or at a programmable power level, or any combination of the foregoing.

21. The method of claim 19 wherein the thing and/or condition sensed by said sensing includes an environmental condition, or temperature, or pressure, or position, or location, or motion, or acceleration, or impact, or distance, or inertial information, or magnetic field, or electrical continuity, or altitude, or a physical parameter, or moisture, or humidity, or a chemical, or a medical parameter, or a biological substance and/or agent, or radioactivity, or optical, or light, or infrared, or an image, or an electromagnetic field, or any combination of the foregoing.

22. The method of claim 18:

wherein said periodically transmitting messages comprises periodically transmitting at least two messages at two different power levels from the RFID device interior to a closable container,

wherein each of the at least two messages includes information uniquely identifying the RFID device and information representing the power level at which the message is transmitted; and

wherein said determining from the number of messages received comprises determining from the number of messages received from the RFID device that are stored or that are relayed, or both, and from the power level thereof, whether the closable container has or has not been opened.

23. The method of claim 18 wherein:

said periodically transmitting messages comprises periodically transmitting messages from each of two RFID devices at different locations interior to the closable container; and

wherein;

said receiving messages transmitted by the RFID device comprises receiving messages transmitted by the two RFID devices via two receiving devices at different locations exterior the closable container;

said method further comprising;

determining from the number of messages transmitted by the first and second RFID devices that are received by each of the first and second receiving devices whether the closable container has or has not been opened.

24. The method of claim 18 wherein said relaying comprises:

relaying the received ones of the messages transmitted periodically by the RFID device, wherein at least some of the substantially attenuated messages are not received; and

processing the relayed messages for monitoring the RFID device, said processing comprising;

determining the location of the RFID device from the relayed messages, or

determining from the number of relayed messages from the RFID device whether the closable container has or has not been opened, or

both of the foregoing.

25. The method of claim 24 wherein said determining the location of the RFID device from the relayed messages comprises:

defining a radius value representative of the power level of each relayed message; and

for each RFID device, determining the intersection of respective geometric shapes having the defined radius values for locating that particular RFID device in the intersection.

26. The method of claim 18 further comprising relating an object RFID device associated with an object to a given closable container by a predetermined relationship, and storing in a database information relating the RFID device interior the given closable container and the object RFID device related thereto.

27. The method of claim 26 wherein the predetermined relationship includes proximity of the object and the given closable container, or absence of proximity of the object and the given closable container, or both, and further comprising providing an indication of whether the object and the given closable container are in the predetermined relationship.

28. The method of claim 26 wherein the object includes a carrier carrying the given closable container, or a vehicle carrying the given closable container, or a driver or operator of a carrier carrying the given closable container, or a driver or operator of a vehicle carrying the given closable container, or an inspector of the given closable container, or a maintenance or service worker for the given closable container, or a person not authorized to be proximate the given closable container, or any combination of the foregoing.