METHOD AND SYSTEM FOR DETERMINING LOCATION INFORMATION

• US 20120001728A1
• Filed: 06/30/2010
• Published: 01/05/2012
• Est. Priority Date: 06/30/2010
• Status: Abandoned Application

• Current Assignee: Alcatel-Lucent USA, Inc. (Nokia Corporation)
• Original Assignee: Alcatel-Lucent USA, Inc. (Nokia Corporation)
• Inventors: Janiszewski, Tom J.
• Application Number:
  US12/826,760
• Publication Number:
  US 20120001728A1
• Time in Patent Office: Days
• US Class Current: 340/8.1
• CPC Class Codes: G08B 13/1427 with transmitter-receiver for distance detection

Abstract

An exemplary location detector includes a receiver that is configured to receive a low power signal from a locating beacon and to receive a transmission from at least one other location detector. The location detector includes a processor that is configured to determine an identifier of the locating beacon from which the low power signal was received. The processor is also configured to determine any difference between a first signal strength of the at least one low power signal received by the receiver and a second signal strength of a low power signal received by at least one other location detector from the same locating beacon. The location detector also includes a transmitter configured to report the first signal strength and the determined identifier of the locating beacon responsive to the processor determining that the first signal strength is at least equal to the second signal strength.

Claims

1. A location detector, comprising:

a receiver that is configured to receive a low power signal from a locating beacon and to receive a transmission from at least one other location detector;

a processor that is configured to

(i) determine an identifier of a locating beacon from which at least one low power signal was received by the receiver and

(ii) determine any difference between a first signal strength of the at least one low power signal received by the receiver and a second signal strength of a low power signal received by at least one other location detector from the locating beacon having the determined identifier; and

a transmitter configured to report the first signal strength and the determined identifier of the locating beacon responsive to the processor determining that the first signal strength is at least equal to the second signal strength.

2. The device of claim 1, wherein

the processor is configured to determine if any other location detector provides an indication of the second signal strength within a preselected time after the receiver receives the at least one low power signal;

and

the transmitter reports the first signal strength and the determined identifier if no other location detector provides an indication of the second signal strength within the preselected time or the first signal strength is at least equal to any second signal strength indicated within the preselected time.

3. The device of claim 1, wherein

the transmitter provides an indication of the first signal strength and the determined identifier responsive to the receiver receiving the at least one low power signal, the indication being for reception by another location detector.

4. The device of claim 1, wherein

the processor is configured to determine when at least three other location detectors each provide an indication of respective second signal strengths;

and

the transmitter reports the first signal strength and the determined identifier if the first signal strength is at least equal to all of the at least three second signal strengths.

5. The device of claim 1, wherein the receiver is configured to receive the low power signal having an approximately 0 dBm power level.

16. The system of claim 1, wherein

each location detector processor is configured to determine when at least three other location detectors each provide an indication of respective second signal strengths;

and

the transmitter reports the first signal strength and the determined identifier if the first signal strength is at least equal to all of the at least three second signal strengths.

19. The system of claim 1, wherein the low power locating beacon signal has an approximately 0 dBm power level.

6. A method of locating a low power beacon, comprising the steps of:

receiving a low power locating beacon signal at a location detector;

determining an identifier of a locating beacon from which the locating beacon signal was received

determining a first signal strength of the received locating beacon signal;

receiving a transmission from at least one other location detector that indicates a second signal strength of a locating beacon signal received by the at least one other location detector from the locating beacon having the determined identifier;

determining any difference between the first signal strength and the second signal strength; and

reporting the first signal strength and the determined identifier to a location determining module if the first signal strength is at least equal to the second signal strength.

7. The method of claim 6, comprising

determining if any other location detector device provides an indication of the second signal strength within a preselected time after receiving the low power locating beacon signal;

and

reporting the first signal strength and the determined identifier if no other location detector provides an indication of the second signal strength within the preselected time or the first signal strength is at least equal to any second signal strength indicated within the preselected time.

8. The method of claim 6, comprising

providing an indication of the first signal strength and the determined identifier responsive to receiving the low power beacon signal, the indication being for reception by another location detector.

9. The method of claim 6, comprising

determining when at least three other location detectors each provide an indication of respective second signal strengths to the location detector;

and

reporting the first signal strength and the determined identifier if the first signal strength is at least equal to all of the at least three second signal strengths.

10. The method of claim 6, wherein low power beacon signal has an approximately 0 dBm power level.

11. The method of claim 6, comprising

receiving the reported first signal strength and the identifier at a location determining module;

determining a location of the low power beacon based on the first signal strength and a known location of the location detector.

12. The method of claim 6, comprising

receiving the reported first signal strength and the identifier at a location determining module;

receiving a reported second signal strength and the identifier at the location determining module;

determining any difference between the reported first signal strength and the reported second signal strength; and

determining a location of the low power beacon using the greater of the reported first signal strength or second signal strength and a known location of the location detector that reported the greater signal strength.

15. The system of claim 12, wherein

each location detector transmitter provides an indication of the first signal strength and the determined identifier responsive to the receiver receiving the at least one low power signal, the indication being for reception by another one of the location detectors.

13. A locating system, comprising:

a locating beacon that transmits a low power locating beacon signal;

a plurality of location detectors each including

a receiver that is configured to receive the low power locating beacon signal and to receive a transmission from at least one other location detector;

a processor that is configured to

(i) determine an identifier of the locating beacon and

(ii) determine any difference between a first signal strength of the received low power locating beacon signal and a second signal strength of a low power signal received by at least one other location detector from the locating beacon having the determined identifier; and

a transmitter configured to report the first signal strength and the determined identifier of the locating beacon responsive to the processor determining that the first signal strength is at least equal to the second signal strength; and

a location determining module configured to receive the reported signal strength and to determine an at least approximate location of the locating beacon.

14. The system of claim 13, wherein

each location detector processor is configured to determine if any other location detector provides an indication of the second signal strength within a preselected time after the receiver receives the at least one low power signal;

and

each location detector transmitter reports the first signal strength and the determined identifier to the location determining module if no other location detector provides an indication of the second signal strength within the preselected time or the first signal strength is at least equal to any second signal strength indicated within the preselected time.

17. The system of claim 13, wherein the location determining module

receives the reported first signal strength and the identifier;

and

determines the at least approximate location of the low power beacon based on the first signal strength and a known location of the location detector from which the reported first signal strength was received.

18. The system of claim 13, wherein the location determining module

receives the reported first signal strength and the identifier from a first one of the location detectors;

receives a reported second signal strength and the identifier from a second one of the location detectors;

determines any difference between the reported first signal strength and the reported second signal strength; and

determines the at least approximate location of the low power beacon using the greater of the reported first signal strength or second signal strength and a known location of the location detector that reported the greater signal strength.