Wireless resource monitoring system and method

• US 20070290924A1
• Filed: 12/14/2005
• Published: 12/20/2007
• Est. Priority Date: 12/14/2005
• Status: Abandoned Application

• Current Assignee: InnerWireless Incorporated (Black Box Ltd.)
• Original Assignee: InnerWireless Incorporated (Black Box Ltd.)
• Inventors: McCoy, James
• Application Number:
  US11/300,218
• Publication Number:
  US 20070290924A1
• Time in Patent Office: Days
• US Class Current: 342/464
• CPC Class Codes: G01S 5/0036 of measured values, i.e. measurement on mobile and position calculation on base station
• CPC Class Codes: G01S 5/013 Identifying areas in a building
• CPC Class Codes: G01S 5/0244 Accuracy or reliability of position solution or of measurements contributing thereto
• CPC Class Codes: G01S 5/0295 Proximity-based methods, e.g. position inferred from reception of particular signals
• CPC Class Codes: G01S 5/14 Determining absolute distances from a plurality of spaced points of known location
• CPC Class Codes: G06Q 10/087 Inventory or stock management, e.g. order filling, procurement or balancing against orders
• CPC Class Codes: G08B 13/2462 Asset location systems combined with EAS inventory, tracking, logistic G06Q10/00; entrance control systems G07C9/00

Abstract

A wireless resource monitoring system and method utilizes a network of deployed radio elements including at least one master radio, a plurality of beacons, and at least one tag. The beacons are placed at known positions. The master radio, the beacons and the tag are in wireless communication with each other. The tag is attached to the resource that is being monitored. A beacon signal is transmitted by the beacons, which includes the identity of the transmitting beacons. The tag receives the beacon signals and measures the signal strength of the beacon signals. The tag then transmits a tag signal, which includes the identity of the transmitting tag, the measured signal strengths of the beacon signals and the identity of the corresponding beacons. The location of the tag is then determined from the tag signal.

Claims

1. A method for determining the location of a tag in a wireless network having at least one master radio, a plurality of beacons, and at least one tag, the beacons being located at known positions, the master radio, the beacons and the tag being in wireless communication with each other, the method comprising:

transmitting, by the beacons, a beacon signal including the identity of the transmitting beacons;

receiving the beacon signals at the tag and measuring an attribute of the beacon signals;

transmitting, by the tag, a tag signal including identity of the transmitting tag, the measured attribute of the beacon signals and the identity of the beacons corresponding to the beacon signals;

receiving the tag signal at the master radio; and

determining the location of the tag from the tag signal.

2. The method according to claim 1, wherein the attribute is a signal strength of the beacon signals.

3. The method according to claim 2, further comprising:

identifying the location of the beacons from the beacons'"'"' identity;

determining beacon-to-tag distances from the measured signal strengths; and

determining a location of the tag from the beacon-to-tag distances and the location of the corresponding beacons.

4. The method according to claim 1, further comprising:

identifying the beacon signal having the highest beacon signal strength value and identifying the corresponding beacon;

comparing the highest beacon signal strength value to a predetermined first threshold value; and

indicating the location of the tag in relation to the beacon corresponding to the highest beacon signal strength value if the highest beacon signal strength value is greater than the first threshold value.

5. The method according to claim 2, further comprising:

identifying a region in which the beacon corresponding to the highest beacon signal strength value is located; and

indicating the location of the tag by the region in which the beacon corresponding to the highest beacon signal strength value is located.

6. The method according to claim 5, further comprising indicating the location of the tag with respect to a room in which the beacon corresponding to the highest beacon signal strength value is located.

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

determining if more than a predetermined minimum number of measured beacon signal strength values from a contiguous group of beacons have values greater than a second predetermined threshold value; and

calculating the location of the tag using the beacon-to-tag distances corresponding to the minimum number of measured beacon signal strength values from the contiguous group of beacons having values greater than the second threshold value.

8. The method according to claim 7, wherein the contiguous groups of beacons are an adjacent group of beacons.

9. The method according to claim 7, further comprising:

identifying a region which includes the calculated location; and

indicating the location of the tag by the region.

10. The method according to claim 9, wherein the region is a room in a building.

11. The method according to claim 1, further comprising:

calculating the location of the tag if the measured beacon signal strength values from a non-contiguous group of beacons;

calculating an uncertainty value associated with the calculated location of the tag; and

displaying the calculated location of the tag and the uncertainty value.

12. The method according to claim 1, further comprising:

calculating the location of the tag if the measured beacon signal strength values include inaccuracies;

calculating an uncertainty value associated with the calculated location of the tag; and

displaying the calculated location of the tag and the uncertainty value.

13. The method according to claim 1, further comprising:

adjusting the calculated beacon-to-tag distances based on the measured beacon signal strength values if a fewer than a minimum number of beacon signal strength values have values greater than a second threshold value;

calculating the location of the tag using the adjusted beacon-to-tag distances;

calculating an uncertainty value associated with the tag'"'"'s calculated location; and

displaying the calculated location of the tag and the uncertainty value.

14. The method according to claim 1, further comprising:

calculating the location of the tag using the beacon-to-tag distance measurements if fewer than a minimum number of beacon signal strength values have values greater than a second threshold value;

calculating an uncertainty value associated with the calculated location;

adjusting the beacon-to-tag distances if the uncertainty value is larger than a maximum acceptable uncertainty value; and

re-calculating the location of the tag by re-adjusting the adjusted beacon-to-tag distances until the uncertainty value is less than the maximum acceptable uncertainty value.

15. The method according to claim 1, wherein the master radio is a radio transceiver.

16. The method according to claim 1, wherein the beacon is a radio transceiver.

17. The method according to claim 1, wherein the tag is a radio transceiver.

18. The method according to claim 1, further comprising attaching the tag to a resource.

19. The method according to claim 1, further comprising transmitting the beacon signals at predetermined time intervals.

20. The method according to claim 1, further comprising transmitting the tag signals at predetermined time intervals.

21. The method according to claim 1, further comprising transmitting the beacon signals in response to a request from the master radio.

22. The method according to claim 1, further comprising transmitting the tag signal in response to a request from the master radio.

23. The method according to claim 1, wherein the master radio, the beacons and the tag communicate using a wireless communication standard.

24. The method according to claim 1, wherein the master radio, the beacons and the tags communicate using a high level communication protocol.

25. The method according to claim 1, wherein the master radio is coupled to an antenna.

26. The method according to claim 1, wherein the master radio is coupled to a distributed antenna system.

27. The method according to claim 1, wherein the tag is powered by a battery.

28. The method according to claim 1, wherein the beacon is powered by a battery.

29. A method for determining the location of a resource deployed in a building, the method utilizing a wireless network having at least one master radio, a plurality of beacons and at least one tag being in wireless communication with each other, the tag being associated with the resource, the method comprising:

deploying the plurality of beacons at known positions in the building;

transmitting, by the beacons, a beacon signal including the identity of the transmitting beacons;

receiving the beacon signals at the tag and measuring the signal strength of the beacon signals;

transmitting, by the tag, a tag signal including identity of the transmitting tag, the measured signal strengths of the beacon signals and the identity of the beacons corresponding to the beacon signals;

receiving the tag signal at the master radio;

identifying a location of the beacons from the beacons'"'"' identity;

determining beacon-to-tag distances from the measured signal strength values; and

determining a location of the tag from the beacon-to-tag distances and the location of the corresponding beacons.

30. The method according to claim 29, further comprising:

identifying the beacon signal having a highest beacon signal strength value and identifying the beacon corresponding to the highest beacon signal strength value;

comparing the highest beacon signal strength value to a predetermined first threshold value; and

indicating the location of the tag in relation to the beacon corresponding to the highest beacon signal strength value if the highest beacon signal strength value is greater than the first threshold value.

31. The method according to claim 30, further comprising:

identifying a region of the building in which the beacon corresponding to the highest beacon signal strength value is located; and

indicating the location of the tag by the region in which the beacon corresponding to the highest beacon signal strength value is located.

32. The method according to claim 31, further comprising indicating the location of the tag with respect to a room in the building in which the beacon corresponding to the highest beacon signal strength value is located.

33. The method according to claim 29, further comprising:

determining if a minimum number of measured beacon signal strength values from a contiguous group of beacons have values greater than a second threshold value; and

calculating the location of the tag using the beacon-to-tag distances corresponding to the minimum number of measured beacon signal strength values from a contiguous group of beacons having values greater than the second threshold value.

34. The method according to claim 33, further comprising:

identifying a region which includes the calculated location; and

indicating the location of the tag by the region.

35. The method according to claim 31, wherein the region is a room in the building.

36. The method according to claim 29, further comprising:

calculating the location of the tag if the measured beacon signal strength values are from a non-contiguous group of beacons;

calculating an uncertainty value associated with the calculated location of the tag; and

displaying the calculated location of the tag and the uncertainty value.

37. The method according to claim 29, further comprising:

calculating the location of the tag if the measured beacon signal strength values include inaccuracies;

calculating an uncertainty value associated with the calculated location of the tag; and

displaying the calculated location of the tag and the uncertainty value.

38. The method according to claim 29, further comprising:

adjusting the calculated beacon-to-tag distances based on the measured beacon signal strength values if fewer than a minimum number of beacon signal strength values have values greater than a second threshold value;

calculating the location of the tag using the adjusted beacon-to-tag distances;

calculating an uncertainty value associated with the calculated location of the tag; and

displaying the calculated location of the tag and the uncertainty value.

39. The method according to claim 29, further comprising:

calculating the location of the tag using the beacon-to-tag distance measurements if fewer than a minimum number of beacon signal strength values have values greater than a second predetermined threshold value;

calculating an uncertainty value associated with the calculated location of the tag;

adjusting the beacon-to-tag distances if the uncertainty value is larger than a maximum acceptable uncertainty value; and

re-calculating the location of the tag by re-adjusting the adjusted beacon-to-tag distances until the uncertainty value is less than the maximum acceptable uncertainty value.

40. The method according to claim 29, further comprising deploying a plurality of beacons in a selected manner in a large room or a hallway.

41. The method according to claim 29, further comprising deploying at least one beacon in each room in the building.

42. The method according to claim 29 wherein the master radio is a radio transceiver.

43. The method according to claim 29 wherein the beacon is a radio transceiver.

44. The method according to claim 29 wherein the tag is a radio transceiver.

45. The method according to claim 29, further comprising:

transmitting the tag signal including the identity of the transmitting tag, the measured signal strengths of the beacon signals and the identity of the beacons corresponding to the beacon signals to a processor; and

determining the location of the tag at the processor using the measured signal strengths of the beacon signals and the location of the beacons corresponding to the beacon signals.

46. The method according to claim 29, further comprising transmitting the beacon signals at predetermined time intervals.

47. The method according to claim 29, further comprising transmitting the tag signals at predetermined time intervals.

48. The method according to claim 29, further comprising transmitting the beacon signals in response to a request.

49. The method according to claim 29, further comprising transmitting the tag signal in response to a request.

50. The method according to claim 29, wherein the master radio, the beacons and the tag communicate using a wireless communication standard.

51. The method according to claim 29, wherein the master radio, the beacons and the tags communicate using a high level communication standard.

52. The method according to claim 29, wherein the beacons are powered by a battery.

53. The method according to claim 29, wherein the tag is powered by a battery.

54. The method according to claim 29, wherein the master radio is coupled to an antenna.

55. The method according to claim 29, wherein the master radio is coupled to a distributed antenna system.

56. A wireless resource monitoring system for determining the location of a resource deployed in a selected area, comprising:

at least one master radio;

a plurality of beacons being deployed at known positions in the selected area and being in wireless communication with the master radio, the beacons being configured to transmit a beacon signal responsive to instructions from the master radio,

a tag associated with the resource, the tag being configured to receive the beacon signals and operable to measure an attribute of the beacons signals and to transmit a tag signal to the master radio, the tag signal including the identity of the tag, the measured attribute of the beacon signals and the identity of the beacons corresponding to the beacon signals; and

a location processor linked to the master radio, the location processor configured to receive the tag signal from the master radio and operable to determine the location of the resource from the tag signal.

57. The system according to claim 56, wherein the attribute is the signal strength of the beacon signals

58. The system according to claim 56, wherein the location processor includes:

means to identify the location of the beacons from the beacons'"'"' identity; and

means to determine beacon-to-tag distances from the measured signal strengths.

59. The system according to claim 58, wherein the location processor includes means to determine a location of the tag from the beacon-to-tag distances and the location of the corresponding beacons.

60. The system according to claim 56, wherein the master radio is a radio transceiver.

61. The system according to claim 56, wherein the beacon is a radio transceiver.

62. The system according to claim 56, wherein the tag is a radio transceiver.

63. The system according to claim 56, further comprising an antenna coupled to the master radio.

64. The system according to claim 56, further comprising a distributed antenna system coupled to the master radio.

65. The system according to claim 56, wherein the beacon is powered by a battery.

66. The system according to claim 56, wherein the tag is powered by a battery.

67. A wireless resource monitoring system for determining the location of a resource in a building, comprising:

at least one master radio;

a plurality of beacons being deployed at known positions in the building and being in wireless communication with the master radio, the beacons being operable to transmit a beacon signal responsive to instructions from the master radio;

a tag associated with the resource, the tag being configured to receive the beacon signals and operable to measure the signal strength of the beacons signals and to transmit a tag signal to the master radio, the tag signal including the identity of the tag, the measured signal strength of the beacon signals and the identity of the beacons corresponding to the beacon signals; and

a location processor linked to the master radio, the location processor configured to receive the tag signal from the master radio and operable to determine the location of the resource in the building from the tag signal.

68. The system according to claim 67, wherein the location processor includes:

means to identify a location of the beacons from the beacons'"'"' identity; and

means to determine beacon-to-tag distances from the measured signal strengths.

69. The system according to claim 68, wherein the location processor includes means to determine a location of the tag from the beacon-to-tag distances and the location of the corresponding beacons.

70. A wireless resource monitoring system for determining the location of a resource deployed in a selected area, comprising:

at least one master radio;

a tag associated with the resource, the tag being configured to transmit a tag signal including the identity of the tag;

a plurality of beacons being deployed at known positions in the selected area and being in wireless communication with the master radio and the tag, the beacons being configured to receive the tag signal and operable to measure an attribute of the tag signal and to transmit a beacon signal to the master radio, the beacon signal including the identity of the transmitting beacon, the measured attribute of the tag signal and the identity of the tag; and

a location processor linked to the master radio, the location processor configured to receive the beacon signal from the master radio and operable to determine the location of the resource from the beacon signal.

71. The system according to claim 70, wherein the attribute is the signal strength of the tag signal.

comparing the highest beacon signal strength value to a predetermined first threshold value;

and