Method and system for analyzing received signal strength

• US 6,150,936 A
• Filed: 08/27/1998
• Issued: 11/21/2000
• Est. Priority Date: 05/20/1996
• Status: Expired due to Term

• Current Assignee: Honeywell International Inc.
• Original Assignee: Pittway Corporation (Honeywell International Inc.)
• Inventors: Addy, Kenneth L.
• Primary Examiner(s): Crosland, Donnie L.
• Application Number:
  US09/141,232
• Time in Patent Office: 817 Days
• Field of Search: 340/539, 340/531, 340/514, 340/506, 340/515, 340/825.69, 340/825.72, 455/423, 455/32.1, 455/134, 455/513, 455/67.1
• US Class Current: 340/539.2
• CPC Class Codes: G08B 25/10 using wireless transmission systems G08B25/009 takes precedence
• CPC Class Codes: G08B 29/123 of line circuits

Abstract

A self testing wireless data communications system suitable for use with an alarm system, the receiving element of the communications system is capable of measuring the signal strength (RSSI) of the received message and comparing it with stored signal information from a memory location associated with the ID of the transmitting device. Upon an unfavorable comparison, the system indicates a trouble condition by updating a user-interface visual display and/or alerting a central station. The system may have additional features such as the stored signal information may be updated to produce a running average of the RSSI of each message, or the indication of a trouble condition may include intelligent processing prior to updating a user-interface visual display. The system further comprises apparatus for initiating an install mode wherein a transmission from each of the remote devices causes RSSI data indicative of the signal strength of the received signal to be stored in the storage apparatus at a location associated with the ID of the remote device.

Claims

1. In a communications system comprising a plurality of remote transmitting devices and a receiving station having a receiver associated therewith, a method for automatically testing the communications system comprising the steps of:

a) receiving at said receiving station a received signal from a transmitting device;

b) generating RSSI data indicative of the signal strength of said received signal;

c) determining the ID of said transmitting device from said received signal;

d) retrieving from a first memory location associated with said ID stored signal information;

e) comparing said stored signal information with said RSSI data; and

f) when said comparison is unfavorable, then indicating a trouble condition.

2. The method of claim 1 further comprising an install mode wherein said stored signal information is determined, using the steps of:

a) receiving at said receiving station a signal from a transmitting device;

b) generating RSSI data indicative of the signal strength of said received signal;

c) receiving at said receiving station the ID of said transmitting device from keycodes entered by an installer; and

d) storing said RSSI data in said first memory location associated with said ID.

3. The method of claim 1 wherein a user-interface visual display is updated as a result of a trouble condition.

4. The method of claim 1 wherein the step of indicating a trouble condition comprises the step of storing information in a second memory location associated with said ID.

5. The method of claim 4 wherein the step of storing information further comprises the step of processing of the information in said second memory location associated with said ID.

6. The method of claim 4 further comprising the steps of:

a) retrieving said information from said second memory location associated with said ID;

b) comparing said information from said second memory location with a predetermined condition; and

c) when said comparison is not favorable, updating a user-interface visual display.

7. The method of claim 6 wherein said information from said second memory location is a count.

8. The method of claim 7 further comprising the step of:

resetting said information in said second memory location when said comparison is favorable.

9. The method of claim 1 wherein a central station is dialed and sent a trouble message as a result of a trouble condition.

10. The method of claim 1 wherein said stored signal information is tolerance compensated prior to being compared to said RSSI data information.

11. The method of claim 10 wherein said stored signal information is tolerance compensated is generated by subtracting a predetermined value from said stored signal information.

12. The method of claim 1 wherein said RSSI data is a processed RSSI value correlated to historical RSSI data.

13. The method of claim 12 wherein said processed RSSI value is a running average of said current RSSI data and prior processed RSSI value stored in a second memory location associated with said ID.

14. The method of claim 2 wherein said RSSI data stored in said first memory location associated with said ID is an average of a number of RSSI data.

15. The method of claim 1 wherein said transmitting devices and said receiver communicate with electromagnetic wave transmission.

16. The method of claim 15 wherein said electromagnetic wave transmission is radio frequency wave transmission.

17. A self-testing data communications system comprising:

a) a plurality of remote devices, each of said remote devices comprising means for transmitting signals, wherein said signals include an ID associated with said remote device;

b) a receiving station comprising;

i) means for receiving signals;

ii) means for generating an RSSI data indicative of the signal strength of the received signal;

iii) means for determining said remote device ID;

iv) storage means for signal information associated with said remote device ID;

v) comparison means for comparing said RSSI data to said stored signal information;

vi) processing means for determining a trouble condition set forth from above comparison;

vii) indication means for indicating a trouble condition set forth from above comparison.

18. The system of claim 17 further comprising means for initiating an install mode wherein transmissions from each of said remote devices causes RSSI data indicative of the signal strength of the received signal to be stored in said storage means as said stored information.

19. The system of claim 17 wherein said remote device ID is correlated with said stored information.

20. The communications system of claim 17 wherein said remote devices and said receiving means communicate by electromagnetic wave transmission.

21. The communications system of claim 20 wherein said electromagnetic wave transmission is radio frequency wave transmission.