METHOD AND SYSTEMS TO FACILITATE REDUCING INTERFERENCE BETWEEN RF SIGNALS

• US 20100201511A1
• Filed: 02/11/2009
• Published: 08/12/2010
• Est. Priority Date: 02/11/2009
• Status: Active Grant

• Current Assignee: UTC Fire & Security Americas Corporation, Inc. (Carrier Global Corporation)
• Original Assignee: UTC Fire & Security Americas Corporation, Inc. (Carrier Global Corporation)
• Inventors: Stebbins, Kevin Gerard, Thomanschefsky, Uwe Hans, Dee, Daniel Joseph, Chabin, Eric
• Granted Patent: US 8,249,510 B2
• Time in Patent Office: Days
• US Class Current: 340/539.100
• CPC Class Codes: H04B 1/3805 with built-in auxiliary receivers
• CPC Class Codes: H04B 1/525 with means for reducing leakage of transmitter signal into the receiver
• CPC Class Codes: H04B 15/04 the interference being caused by substantially sinusoidal oscillations, e.g. in a receiver or in a tape-recorder

Abstract

A method for reducing interference between radio frequency (RF) signals includes initiating a first communication session from a control system to a remote RF device using a first RF signal to transmit a first outgoing message, wherein the first RF signal within a first RF range, and detecting a second communication session transmitted from a system RF device to the control system using a second RF signal. The second communication session includes an incoming message, and the second RF signal is within a second RF range at least partially overlapping the first RF range. The method includes, when the second communication session is detected, interrupting the first communication session for a time period, receiving the second communication session during the time period to receive the incoming message, and, after the time period expires, resuming the first communication session with the remote RF device.

Claims

1. A method for reducing interference between radio frequency (RF) signals, said method comprising:

initiating a first communication session from a control system to a remote RF device using a first RF signal to transmit a first outgoing message to the remote RF device, the first RF signal within a first RF range;

detecting, at the control system, a second communication session transmitted from a system RF device to the control system using a second RF signal, the second communication session including an incoming message from the system RF device, the second RF signal within a second RF range at least partially overlapping the first RF range;

when the second communication session is detected, interrupting the first communication session for a time period;

receiving the second communication session during the predetermined time period to receive the incoming message from the system RF device; and

after the time period expires, resuming the first communication session with the remote RF device.

2. A method in accordance with claim 1, wherein:

interrupting the first communication session comprises terminating the first communication session; and

resuming the first communication session comprises;

initiating a third communication session after the predetermined time period expires;

transmitting the first outgoing message in the third communication session; and

completing the third communication session.

3. A method in accordance with claim 1, wherein resuming the first communication session comprises:

creating a second outgoing message based on the received incoming message; and

transmitting the second outgoing message in the resumed first communication session.

4. A method in accordance with claim 1, further comprising:

creating a second outgoing message based on the received incoming message;

initiating a third communication session from the control system to the remote RF device; and

transmitting the second outgoing message in the third communication session.

5. A method in accordance with claim 1, wherein initiating a first communication session from the control system to a remote RF device further comprises initiating a Global System for Mobile Communications (GSM) signal as the first RF signal.

6. A method in accordance with claim 1, wherein detecting a second communication session initiated from a system RF device to the control system using a second RF signal further comprises detecting a second communication session comprising a plurality of identical transmission packets transmitted from the system RF device to the control system.

7. A method in accordance with claim 6, wherein detecting a second communication session comprising a plurality of identical transmission packets further comprises detecting a plurality of identical transmission packets, wherein each of the identical transmission packets comprises a synchronization portion, a start portion, and a message portion.

8. A control system, comprising:

a radio frequency (RF) transmitter-receiver module configured to transmit and receive first RF signals within a first RF range, said RF transmitter-receiver module comprising at least one RF transmitter-receiver;

an RF receiver module configured to receive second RF signals within a second RF range that at least partially overlaps the first RF range, said RF receiver module comprising at least one RF receiver; and

a processor coupled in communication with said RF transmitter-receiver module and said RF receiver module, said processor configured to;

engage in a first communication session with a remote RF device using said RF transmitter-receiver module to transmit a first outgoing message within said first RF signals;

detect a second communication session within said second RF signals using said RF receiver module, said second RF signals transmitted by a system RF device and comprising an incoming message encoded therein;

when said second communication session is detected, interrupt said first communication session for a time period;

receive said second RF signals during said time period using said RF receiver module; and

after said time period expires, resume said first communication session.

9. A control system in accordance with claim 8, further configured to:

terminate said first communication session;

begin counting said predetermined time period;

after said predetermined time period expires, initiate a third communication session with said remote RF device using said RF transmitter-receiver module to transmit the first outgoing message; and

complete said third communication session.

10. A control system in accordance with claim 8, wherein said processor is further configured to:

create a second outgoing message based on the received incoming message; and

transmit the second outgoing message in said first communication session when said first communication is resumed.

11. A control system in accordance with claim 8, wherein said processor is further configured to:

create a second outgoing message based on the received incoming message;

initiate a third communication session from the control system to the remote RF device after said predetermined time period expires; and

transmit the second outgoing message in said third communication session.

12. A control system in accordance with claim 8, wherein said processor is further configured to concurrently engage in a plurality of bidirectional communication sessions with each remote device of a plurality of remote devices using said RF transmitter-receiver module, said processor configured to:

interrupt said plurality of bidirectional communication sessions; and

resume said plurality of bidirectional communication sessions.

13. A control system in accordance with claim 8, wherein the system RF device comprises at least one of a motion sensor, a glass-break sensor, a door sensor, a window sensor, a smoke sensor, a temperature sensor, a water sensor, a shock sensor, and a carbon monoxide sensor.

14. A security system, comprising:

at least one sensor comprising a radio frequency (RF) transmitter;

at least one remote device comprising an RF transmitter-receiver, said at least one remote device located remotely from said at least one sensor; and

a control system comprising at least one RF receiver configured to communicate with said at least one sensor and at least one RF transmitter-receiver configured to communicate with said at least one remote device, said control system located remotely from said at least one sensor and said at least one remote device, said control system configured to;

initiate a first transmission session of a first RF signal to said at least one remote device, the first RF signal within a first RF range, the first RF signal having a first outgoing message encoded therein;

detect a second transmission session of a second RF signal transmitted by said at least one sensor, the second RF signal within a second RF range at least partially overlapping the first RF range;

when the second transmission session is detected, interrupt the first transmission for a time period;

receive at least one incoming message from said at least one sensor during the time period, the at least one incoming message encoded in the second RF signal; and

after the time period expires, resume the first transmission session with the first outgoing message encoded therein to said at least one remote device.

15. A security system in accordance with claim 14, wherein:

said at least one remote device further comprises a Global Standard for Mobile Communications (GSM) transmitter-receiver; and

said at least one RF transmitter-receiver further comprises a GSM transmitter-receiver.

16. A security system in accordance with claim 14, wherein said at least one sensor comprises at least one of a motion sensor, a glass-break sensor, a door sensor, a window sensor, a smoke sensor, a temperature sensor, a water sensor, a shock sensor, and a carbon monoxide sensor.

17. A security system in accordance with claim 14, wherein said at least one incoming message comprises a synchronization portion, a start portion, and a message portion.

18. A security system in accordance with claim 14, wherein said at least one sensor is configured to transmit a series of transmission packets each including the incoming messages encoded therein.

19. A security system in accordance with claim 14, further comprising an alarm module, wherein said control system is further configured to:

determine an action to be performed based on the incoming message; and

activate said alarm module as the determined action to perform.

20. A security system in accordance with claim 14, wherein said control system is further configured to:

create a second outgoing message based on the at least one incoming message; and

after the predetermined time period expires, transmit the second outgoing message to said at least one remote device.