Displaying radio frequency identification (RFID) read range of an RFID reader based on feedback from fixed RFID beacon tags

• US 8,258,953 B2
• Filed: 02/12/2009
• Issued: 09/04/2012
• Est. Priority Date: 02/12/2009
• Status: Active Grant

• Current Assignee: Symbol Technologies, LLC (Zebra Technologies Corporation)
• Original Assignee: Symbol Technologies, Inc. (Zebra Technologies Corporation)
• Inventors: Stern, Miklos, Bekrisky, Benjamin
• Primary Examiner(s): Bugg, George
• Assistant Examiner(s): MCNALLY, KERRI L
• Application Number:
  US12/369,838
• Publication Number:
  US 20100201488A1
• Time in Patent Office: 1,300 Days
• Field of Search: 340/572.1
• US Class Current: 340/572.1
• CPC Class Codes: G01S 1/68 Marker, boundary, call-sign, or like beacons transmitting signals not carrying directional information
• CPC Class Codes: G06K 7/0008 General problems related to the reading of electronic memory record carriers, independent of its reading method, e.g. power transfer

Abstract

The present disclosure describes a system, methods and apparatus for displaying read range of a nomadic Radio Frequency Identification (RFID) reader based on feedback from fixed RFID beacon tags. For instance, the nomadic RFID reader can transmit an interrogation signal within a space that includes a plurality of fixed RFID beacon tags at known locations, and can receive response signals from a group of the fixed RFID beacon tags. Based on known locations of the group of fixed RFID beacon tags, a read range of the RFID reader can be determined. The read range is defined by the group of the fixed RFID beacon tags. The read range of the nomadic RFID reader can then be displayed on a display along with other information about the fixed RFID beacon tags and/or RFID item tags that are within the read range of the nomadic RFID reader.

Claims

1. A method, comprising:

transmitting an interrogation signal from a nomadic Radio Frequency Identification (RFID) reader over an actual coverage area within a space, wherein the space includes a plurality of fixed RFID beacon tags at known locations;

receiving, at the nomadic RFID reader, response signals from one or more fixed RFID beacon tags in the actual coverage area;

determining, based on the response signals and the known locations of the one or more fixed RFID beacon tags, an approximate coverage area of the interrogation signal; and

displaying the approximate coverage area of the nomadic RFID reader on a display, wherein the approximate coverage area displayed on the display is defined by the one or more fixed RFID beacon tags that responded to the interrogation signal.

2. A method according to claim 1, wherein the step of determining, based on the response signals and the known locations of the one or more fixed RFID beacon tags, an approximate coverage area of the interrogation signal, comprises:

determining, at the nomadic RFID reader based on the response signals and the known locations of the one or more fixed RFID beacon tags, the approximate coverage area of the interrogation signal.

3. A method according to claim 2, wherein the step of determining, at the nomadic RFID reader based on the response signals and the known locations of the one or more fixed RFID beacon tags, the approximate coverage area of the interrogation signal, comprises:

determining, at the nomadic RFID reader for each of the received response signals, identification information corresponding to each of the one or more fixed RFID beacon tags;

determining, at the nomadic RFID reader based on the identification information, location information corresponding to each of the one or more fixed RFID beacon tags;

determining, at the nomadic RFID reader, the approximate coverage area of the interrogation signal based on the location information corresponding to each of the one or more fixed RFID beacon tags.

4. A method according to claim 1, wherein the step of determining, based on the response signals and the known locations of the one or more fixed RFID beacon tags, an approximate coverage area of the interrogation signal, comprises:

communicating information regarding the response signals from the nomadic RFID reader to a monitoring server; and

determining, at the monitoring server, the approximate coverage area of the interrogation signal based on the response signals; and

providing, from the monitoring server to the nomadic RFID reader, display information regarding the approximate coverage area of the interrogation signal, wherein the approximate coverage area of the interrogation signal is based on location information corresponding to each of the one or more fixed RFID beacon tags.

5. A method according to claim 4, wherein the step of determining, at the monitoring server, the approximate coverage area of the interrogation signal based on the response signals, comprises:

determining, at the monitoring server for each of the received response signals, identification information corresponding for each of the one or more fixed RFID beacon tags;

determining, at the monitoring server based on the identification information, location information corresponding for each of the one or more fixed RFID beacon tags; and

determining, at the monitoring server, the approximate coverage area of the first interrogation signal based on the location information corresponding for each of the one or more fixed RFID beacon tags;

communicating, from the monitoring server to the nomadic RFID reader, information that indicates the approximate coverage area of the nomadic RFID reader and location information corresponding to each of the one or more fixed RFID beacon tags; and

displaying, on a display of the nomadic RFID reader, a map of the space that comprises;

the approximate coverage area of the nomadic RFID reader and location information corresponding to each of the one or more fixed RFID beacon tags.

6. A method according to claim 1, further comprising:

placing items in the space, the items each having RFID item tags attached thereto;

receiving, at the nomadic RFID reader, response signals from the RFID item tags in the actual coverage area that are attached to items; and

displaying, on a display, information associated with the first RFID item tag that is located within the first approximate coverage area of the nomadic RFID reader to identify the first item as being located within the first approximate coverage area of the nomadic RFID reader.

7. A method according to claim 1, further comprising:

displaying, on the display, an image of the approximate coverage area of the nomadic RFID reader.

8. A method according to claim 7, wherein the image of the approximate coverage area of the nomadic RFID reader is a picture image of the first approximate coverage area of the nomadic RFID reader.

9. A method according to claim 7, wherein the image of the approximate coverage area of the nomadic RFID reader is a video image of the approximate coverage area of the nomadic RFID reader.

10. A method according to claim 1, further comprising:

transmitting, from the nomadic RFID reader as the nomadic RFID reader moves about within the space, a second interrogation signal over a second actual coverage area within the space;

receiving, at the nomadic RFID reader, response signals from a second group of the fixed RFID beacon tags in the second actual coverage area and other response signals from other RFID item tags in the second actual coverage area that are attached to other items;

determining, based on the known locations of the second group of fixed RFID beacon tags, a second approximate coverage area of the second interrogation signal based on the response signals from the second group of the fixed RFID beacon tags; and

displaying, on the display, the second approximate coverage area of the nomadic RFID reader and information associated with the other RFID item tags that are located within the second approximate coverage area of the nomadic RFID reader to identify the other items located within the second approximate coverage area of the nomadic RFID reader, wherein the second approximate coverage area displayed on the display is defined by the second group of the fixed RFID beacon tags.

11. A method according to claim 1, wherein the step of displaying the approximate coverage area of the nomadic RFID reader on a display, comprises:

displaying the approximate coverage area of the nomadic RFID reader with a map of the space on the display of the nomadic RFID reader.

12. A method according to claim 5, wherein the step of displaying the approximate coverage area of the nomadic RFID reader on a display, comprises:

displaying, on a display of the monitoring server, the approximate coverage area of the nomadic RFID reader and location information corresponding to each of the one or more fixed RFID beacon tags with a map of the space.

13. A method according to claim 1, wherein each of the RFID beacon tags is programmed with an identifier and information regarding actual location of that RFID beacon tag.

14. A method according to claim 6, wherein each of the RFID item tags is programmed with an identifier and object data that described items the particular RFID item tag is attached to.

15. A method according to claim 1, wherein the interrogation signal is a first interrogation signal transmitted from the nomadic RFID reader at a first transmit power, wherein the one or more fixed RFID beacon tags in the actual coverage area comprises a first set of fixed RFID beacon tags in a first actual coverage area, and wherein the step of receiving, at the nomadic RFID reader, response signals from one or more fixed RFID beacon tags in the actual coverage area, comprises:

receiving, at the nomadic RFID reader, a response signal from each of the first set of fixed RFID beacon tags and from each of a first set of RFID item tags upon receiving the first interrogation signal, wherein each of the fixed RFID beacon tags are fixed at first known locations in the first actual coverage area and, wherein the first set of RFID item tags comprises a first RFID item tag; and

wherein the step of determining, based on the response signals and the known locations of the one or more fixed RFID beacon tags, an approximate coverage area of the interrogation signal , comprises

defining a first approximate coverage area of the first interrogation signal based on the first known locations of the first set of fixed RFID beacon tags; and

determining that the first set of RFID item tags are located within the first approximate coverage area of the nomadic RFID reader.

16. A method according to claim 15, further comprising:

transmitting a second interrogation signal from the nomadic RFID reader, wherein the second interrogation signal has a lower transmit power than the first transmit power;

transmitting response signals from a second set of fixed RFID beacon tags and from a second set of RFID item tags upon receiving the second interrogation signal, wherein the second set of fixed RFID beacon tags are fixed at other known locations, wherein the second set of fixed RFID beacon tags includes at least some of the first set of fixed RFID beacon tags, and wherein the second set of RFID item tags includes at least some of the first set of RFID item tags;

defining a second coverage area of the nomadic RFID reader based on the other known locations of the second set of fixed RFID beacon tags; and

determining that the second set of RFID item tags are located within the second coverage area of the nomadic RFID reader.

17. A method according to claim 16, further comprising:

transmitting a third interrogation signal from the nomadic RFID reader, wherein the third interrogation signal has a higher transmit power than the first transmit power;

transmitting response signals from a third set of fixed RFID beacon tags and from a third set of RFID item tags upon receiving the third interrogation signal, wherein the third set of fixed RFID beacon tags are fixed at known locations, wherein the third set of fixed RFID beacon tags includes all of the first set of fixed RFID beacon tags, and wherein the third set of RFID item tags includes all of the first set of RFID item tags;

defining a third coverage area of the nomadic RFID reader based on the known locations of the third set of fixed RFID beacon tags; and

determining that the third set of RFID item tags are located within the third coverage area of the nomadic RFID reader.

18. A nomadic Radio Frequency Identification (RFID) reader, comprising:

a transmitter designed to transmit an interrogation signal at a transmit power over a actual coverage area within a space, wherein the space includes a plurality of fixed RFID beacon tags at known locations;

a receiver designed to receive response signals from a group of fixed RFID beacon tags in the actual coverage area;

a processor designed to determine, based on the response signals and the known locations of the group of fixed RFID beacon tags, an approximate coverage area of the interrogation signal that corresponds to and is defined by the known locations of the group of fixed RFID beacon tags; and

a display designed to display a map of the space and the approximate coverage area within the space of the first interrogation signal transmitted by the nomadic RFID reader, wherein the approximate coverage area that is displayed corresponds to and is defined by the known locations of the group of the fixed RFID beacon tags.

19. A nomadic RFID reader according to claim 18, wherein the processor is further designed to determine identification information corresponding to each of the first group of the fixed RFID beacon tags from each of the received response signals, corresponding location information for each of the first group of the fixed RFID beacon tags, and the approximate coverage area of the first interrogation signal based on the location information corresponding to each of the first group of the fixed RFID beacon tags.

20. A nomadic RFID reader according to claim 18, wherein the transmitter is further designed to communicate information regarding the response signals to a monitoring server, and

where the monitoring server is designed to:

determine the approximate coverage area of the first interrogation signal based on the response signals, wherein the approximate coverage area of the first interrogation signal is based on location information corresponding for each of the first group of the fixed RFID beacon tags, and

wherein the receiver is designed to receive display information generated by the monitoring server describing the approximate coverage area of the first interrogation signal.

21. A nomadic RFID reader according to claim 18, wherein the space includes one or more items, each having RFID item tags attached thereto including an RFID item tag that is attached to an item located in the actual coverage area, and wherein:

the receiver is further designed to receive a response signal from the RFID item tag,

the display is further designed to display information associated with the RFID item tag that is located within the approximate coverage area of the nomadic RFID reader to identify the item as being located within the approximate coverage area of the nomadic RFID reader.

22. A nomadic RFID reader according to claim 18, further comprising:

an imaging device designed to generate an image of the approximate coverage area of the nomadic RFID reader; and

wherein the display is further designed to display the image of the approximate coverage area of the nomadic RFID reader.

23. A method for displaying read range of a nomadic Radio Frequency Identification (RFID) reader based on feedback from fixed RFID beacon tags, the method comprising:

transmitting a first interrogation signal from the nomadic RFID reader within a space that includes a plurality of fixed RFID beacon tags at known locations;

receiving, at the nomadic RFID reader, response signals from a group of the fixed RFID beacon tags;

determining, based on known locations of the group of fixed RFID beacon tags, a read range of the nomadic RFID reader that is defined by the group of the fixed RFID beacon tags; and

displaying the read range of the nomadic RFID reader on a display.

24. A method according to claim 23, wherein the step of displaying the approximate coverage area of the nomadic RFID reader on a display, comprises:

displaying the approximate coverage area of the nomadic RFID reader with a map of the space on a display of the nomadic RFID reader.

25. A method according to claim 23, wherein the step of displaying the approximate coverage area of the nomadic RFID reader on a display, comprises:

displaying the approximate coverage area of the nomadic RFID reader with a map of the space on a display of a monitoring server.