Methods for determining proximity between radio frequency devices and controlling switches

• US 8,792,826 B2
• Filed: 04/02/2007
• Issued: 07/29/2014
• Est. Priority Date: 04/03/2006
• Status: Active Grant

• Current Assignee: Vizpin Inc.
• Original Assignee: ECKey Corporation
• Inventors: Willis, Nicholas Hedley
• Primary Examiner(s): Alam, Fayyaz
• Assistant Examiner(s): Rachedine, Mohammed
• Application Number:
  US12/295,670
• Publication Number:
  US 20090156126A1
• Time in Patent Office: 2,675 Days
• Field of Search: None
• US Class Current: 455/41.2
• CPC Class Codes: G01S 11/06 using intensity measurements
• CPC Class Codes: G01S 5/0226 Transmitters
• CPC Class Codes: H04W 12/08 Access security

Abstract

The invention relates to a method of determining the proximity of radio frequency devices using the analysis of a series of receive signal strength indicator (RSSI) values. In particular the invention further relates to a method for the control of a switch based on the proximity of the radio frequency devices.

Claims

1. An access control switch controller comprising:

a locking mechanism present at a location with an antenna for receiving a signal from a transmitting radio frequency device; and

a processor configured to;

determine raw values of the signal strength of said signal over time,

from the raw values of signal strength over time, calculating a plurality of technical indicators indicating trends in the signal strength at said location, and

output a trigger signal controlling access, via the locking mechanism, said trigger signal invoked by programmed trigger rules which arc based on said trends,

wherein the switch controller processor is associated with a door lock and the trigger signal opens and/or closes the door lock.

2. The access control switch controller of claim 1 in which one said technical indicator is an exponential moving average of the signal strength over time.

3. The access control switch controller of claim 1 in which one said technical indicator is a moving average convergence divergence of the signal strength over time.

4. The access control switch controller of claim 1 in which the technical indicators include financial market technical indicators.

5. The access control switch controller of claim 1 in which the transmitting radio frequency device transmits in the 2.4 GHz radio bands.

6. The access control switch controller of claim 1 in which the transmitting radio frequency device supports a radio frequency communication method selecting from the group consisting of:

General Packet Radio Service, GSM, CMDA, Bluetooth, ZigBee, Wifi, 802.11x.

7. The access control switch controller of claim 1 in which the processor is further configured to initiate a pairing algorithm with the transmitting radio frequency device.

8. The access control switch controller of claim 1 in which the processor is further configured to provide personal area networking connection to serve HTML pages to administer a configuration of switch controllers.

9. A method of electronically controlling a lock a door lock, the method comprising:

receiving at a single door lock controller a signal from a transmitting radio frequency device;

determining raw values of the signal strength of said signal over time;

from the raw values of the signal strength over time, calculating a plurality of technical indicators; and

outputting a trigger signal opening and/or closing the door lock, said trigger signal invoked by programmed trigger rules including one or more said technical indicators.

10. The method of claim 9 in which one said technical indicator is an exponential moving average of the signal strength over time.

11. The method of claim 9 in which one said technical indicator is a moving average convergence divergence of the signal strength over time.

12. The method of claim 9 in which the technical indicators include financial market technical indicators.

13. The method of claim 9 in which the transmitting radio frequency device transmits in the 2.4 GHz radio bands.

14. The method of claim 9 in which the transmitting radio frequency device supports a radio frequency communication method selecting from the group consisting of:

General Packet Radio Service, GSM, CMDA, Bluetooth, ZigBee, Wifi, 802.11x.

15. The method of claim 9 in which a pairing algorithm is initiated with the transmitting radio frequency device.

16. The method of claim 9 further including providing a personal area networking connection to serve HTML pages to administer a configuration of switch controllers.

17. An access control unit receiving signals from a transmitting radio frequency device and controlling access by locking and unlocking a lock, the access control unit comprising:

an antenna for receiving a signal from the transmitting radio frequency device; and

a processor configured to;

determine the signal strength of the received signal as a measure of distance,

determine the signal strength of the received signal over time as a measure of speed,

based on said determinations, calculate a plurality of technical indicators including an exponential moving average of the received signal strength over time and a moving average convergence divergence of the signal strength over time,

measure the proximity of the transmitting radio frequency device using a plurality of different trigger rules each based on one more said technical indicators, and

based on the measured proximity controlling the lock.

18. The access control unit of claim 17 in which the technical indicators include financial market technical indicators.

19. The access control unit of claim 17 in which the transmitting radio frequency device transmits in the 2.4 GHz radio bands.

20. The access control unit of claim 17 in which the transmitting radio frequency device supports a radio frequency communication method selecting from the group consisting of:

General Packet Radio Service, GSM, CMDA, Bluetooth, ZigBee, Wifi, 802.11x.

21. The access control unit of claim 17 in which the processor is further configured to initiate a pairing algorithm with the transmitting radio frequency device.

22. The access control unit of claim 17 in which the processor is further configured to provide personal area networking connection to serve HTML pages to administer a configuration of switch controllers.