RF dynamic channel switching method

• US 7,065,323 B2
• Filed: 09/30/2002
• Issued: 06/20/2006
• Est. Priority Date: 09/30/2001
• Status: Active Grant

• Current Assignee: Harrow Products (Delaware) LLC (Allegion PLC)
• Original Assignee: Harrow Products Incorporated
• Inventors: Gonzales, Eric V., Taylor, Ronald, Wiemeyer, James F.
• Primary Examiner(s): Cumming, William D.
• Application Number:
  US10/262,249
• Publication Number:
  US 20030098779A1
• Time in Patent Office: 1,359 Days
• Field of Search: 455/425, 455/67.3, 455/67.1, 455/63.2, 455/464, 340/5.61, 340/539.3, 340/539.16, 340/318, 370/318
• US Class Current: 455/63.2
• CPC Class Codes: G07C 2009/00793 by Hertzian waves
• CPC Class Codes: H04W 24/00 Supervisory, monitoring or testing arrangements
• CPC Class Codes: H04W 72/02 Selection of wireless resources by user or terminal
• CPC Class Codes: H04W 76/10 Connection setup
• CPC Class Codes: H04W 92/04 Interfaces between hierarchically different network devices

Abstract

In an access control system, a method and system for dynamic channel selection to select a channel for communication between a Wireless Access Point Module (WAPM) and a Wireless Panel Interface Module (WPIM). A number of communication channels are available. The WAPM attempts to communicate over a first channel and selects a second channel if the first channel is unsuccessful. The WPIM scans all the available channels so that communication may be established regardless of the channel chosen by the system. Alternatively, the available channels may be segmented into groups and an individual WAPM may be assigned to a group of channels rather than a single channel.

Claims

1. In wireless access control system, a method for communicating between a Wireless Access Point Module (WAPM) and a Wireless Panel Interface Module (WPIM) using a plurality of wireless channels, the method comprising the steps of:

selecting to transmit from said WAPM to said WPIM using of said plurality of wireless channels;

determining an error rate of the one of the wireless channels;

automatically and randomly selecting another of said wireless channels when the error rate of the one of the wireless channels is above a threshold;

determining a second error rate of the selected other of the wireless channels; and

transmitting from said WAPM to said WPIM using the other of said plurality of wireless channels if the second error rate of the other of the wireless channels is below the threshold.

2. The method of claim 1 wherein each of the available wireless channels is randomly cycled through to attempt to locate a channel whose error rate is below the threshold.

3. The method of claim 2 wherein each of the wireless channels is checked a plurality of times.

4. The method of claim 1 wherein the other of the channels is an adjacent channel in frequency.

5. The method of claim 1 wherein said plurality of channels are partitioned into a plurality of groups of channels.

6. The method of claim 5 wherein said WAPM is assigned to a specific group of channels.

7. The method of claim 6 wherein said WAPM attempts to communicate over other channels in said specific group when said WAPM is not able to communicate over a channel in said group.

8. The method of claim 7 wherein said WPIM no longer attempts to communicate after each channel in said group has been checked a plurality of times.

18. The method of claim 1, wherein at least one of said WAPM and said WIPM no longer attempts to communicate after each of the channels has been checked a plurality of times.

9. A radio frequency (“

RF”

) access control system comprising;

a Wireless Access Point Module (WAPM); and

a Wireless Panel Interface Module (WPIM) having a plurality of wireless channels for communication between said WAPM and said WPIM, and said WAPM is configured to transmit to said WPIM over one of the channels, to determine an error rate of the one channel, to automatically and randomly select another of the channels when the error rate of the one channel is above a threshold, to determine a second error rate of the selected other channel, and to transmit to said WPIM over the selected other channel if the second error rate of the other channel is below the threshold.

10. The system of claim 9 wherein each of the wireless channels is randomly cycled through to attempt to locate a channel whose error rate is below the threshold.

11. The system of claim 10 wherein each wireless channel is checked a plurality of times.

12. The system of claim 11 wherein at least one of said WAPM and said WPIM no longer attempts to communicate after each channel has been checked a plurality of times.

13. The system of claim 9 wherein the other channel is an adjacent channel in frequency.

14. The system of claim 9 wherein said plurality of channels are partitioned into a plurality of groups of channels.

15. The system of claim 14 wherein said WAPM is assigned to a specific group of channels.

16. The system of claim 15 wherein said WAPM attempts to communicate over other channels in said specific group when said WAPM is not able to communicate over a first channel in said group.

17. The system of claim 16 wherein said WPIM no longer attempts to communicate after each channel in said group has been checked a plurality of times.