Wireless messenger system

• US 20060038654A1
• Filed: 08/05/2005
• Published: 02/23/2006
• Est. Priority Date: 08/18/2004
• Status: Abandoned Application

• Current Assignee: Computerized Security Systems, Inc. (dormakaba Holding AG)
• Original Assignee: Computerized Security Systems, Inc. (dormakaba Holding AG)
• Inventors: Khalil, Mohamad A.
• Application Number:
  US11/198,201
• Publication Number:
  US 20060038654A1
• Time in Patent Office: Days
• US Class Current: 340/5.500
• CPC Class Codes: G07C 2209/06 Involving synchronization or resynchronization between transmitter and receiver; reordering of codes
• CPC Class Codes: G07C 2209/61 Signal comprising different frequencies, e.g. frequency hopping
• CPC Class Codes: G07C 9/00 Individual registration on entry or exit
• CPC Class Codes: G07C 9/00904 for hotels, motels, office buildings or the like
• CPC Class Codes: G07C 9/27 with central registration
• CPC Class Codes: H04B 1/713 using frequency hopping

Abstract

A method of communicating between electronic door locks, access point hubs and a central controller includes the steps of transmitting a probe signal from a central controller, or access point hub receiver to the electric door lock in several different frequencies. Transmission between the locks stations and the access point hub are then synchronized to accommodate multiple lock stations and to prevent overlapping transmissions.

Claims

1. A method of communicating between a plurality of electronic door lock assemblies and a controller comprising the steps of:

a) transmitting a probe signal in several different frequencies from a receiver/transmitter associated with the electronic door lock;

b) detecting the probe signal and transmitting a probe response with a transmitter and receiver associated with the controller;

c) receiving the probe response with the receiver/transmitter associated with the electronic door lock; and

d) synchronizing the electronic door lock with the controller based on the probe signal and the probe response signal.

2. The method as recited in claim 1, wherein step a) comprises a probe signal having length shorter than a frequency dwell time of the several different frequencies.

3. The method as recited in claim 1, wherein the probe response comprises a transmission time.

4. The method as recited in claim 1, wherein the step b) comprises recording the time the probe response was transmitted and determining a difference between the time the probe response was transmitted and the time the probe response was received.

5. The method as recited in claim 4, wherein the step d) comprises adjusting the time at which the receiver/transmitter associated with the electronic lock transmits based on the difference.

6. The method as recited in claim 1, including the step of monitoring a blanking period to confirm synchronization.

7. The method as recited in claim 6, wherein the blanking period is of a time determined to accommodate a maximum allowed drift between frequencies.

8. The method as recited in claim 7, including the step of initiating a resynchronization upon determining that a frequency between the electronic lock and the controller are no longer synchronized.

9. A method of communicating between a plurality of electronic door lock assemblies and a central controller, said method comprising the steps of:

a) transmitting a first radio frequency (RF) signal at a first time period by one of the central controller and one of the plurality of electronic door lock assemblies;

b) receiving the first radio signal and transmitting an acknowledgement signal to acknowledge receipt;

c) determining a non-receipt of the first RF signal in the absence of the acknowledgement signal; and

d) transmitting the first RF signal again after a second time period different than the first time period.

10. The method as recited in claim 9, where the second time period is selected from a first set of random values.

11. The method as recited in claim 10, wherein the number of time values present in the set of random values is increased with consecutive non-receipt of the first RF signal.

12. The method as recited in claim 9, where the first RF signal and the acknowledgement comprise a complete frame sequence.

13. The method as recited in claim 12, wherein the complete frame sequence includes a maximum time that is less than the time used to determine an idle state of one of the controller and one of the plurality of electronic locks.

14. The method as recited in claim 9, including the step of determining an availability of the controller for receiving a transmission from the electronic door lock.

15. The method as recited in claim 14, wherein the availability time is determined by measuring RF activity time.

16. The method as recited in claim 15, wherein the time is related to a number of RF bits that can be handled in a defined time, and the availability time is determined with respect to the determined number of RF bits.