Interference avoidance technique for wireless networks used in critical applications

Patent metadata

Field	Value
Publication number	US-9565575-B2
Application number	US-201313951116-A
Country	US
Kind code	B2
Filing date	Jul 25, 2013
Priority date	Jul 25, 2013
Publication date	Feb 7, 2017
Grant date	Feb 7, 2017

Abstract

An apparatus is provided that uses the steps of providing a plurality of wireless sensor devices coupled to a controller in a security system configured into a wireless network where at least one is a child sensor device that communicates with the controller through at least first and second parent sensor devices, the child sensor device measuring an environmental parameter within the secured area and transmitting a message to the controller through the at least two parents, the message is transmitted during a first time period and on a first frequency to the first parent and a copy is transmitted during a second time period and on a second frequency to the second parent wherein the first and second times and first and second frequencies are all different and wherein the first and second time periods are directly adjacent to one another in time.

First claim

The invention claimed is:

1. A method for transmitting a message from a wireless sensor device among a plurality of wireless sensor devices configured in a wireless network in a security system, the method comprising:
providing the plurality of wireless sensor devices coupled to a control panel of the security system, the plurality of wireless sensor devices configured into the wireless network that protects a secured area, wherein at least one wireless sensor device of the plurality of wireless sensor devices being a child sensor device that communicates with the control panel through at least first and second parent sensor devices, wherein each of the plurality of wireless sensor devices further comprises a sensor, a repeater or an output device; the child sensor device measuring an environmental parameter within the secured area; and
the child sensor device transmitting the message including at least the measured environmental parameter to the control panel through each of the at least first and second parent sensor devices, wherein the message is transmitted using a first channel during a first time period and on a first frequency to the first parent sensor device and a copy of the message is transmitted using a second channel during a second time period and on a second frequency to the second parent sensor device,
wherein the first and second time periods and the first and second frequencies are all different, the second time period begins immediately after a conclusion of the first time period;
wherein the first channel and the second channel are selected by a registration processor of the child sensor device during a registration process, to include the child sensor device in the wireless network, based on a respective set of channels available of the first and second parent sensor devices for the child sensor device to communicate with the control panel through the first and second parent sensor devices.

2. The method as in claim 1 further comprising the child sensor device using frequency hopping for transmission of the message and the copy of the message to the control panel through the first and second parent sensor devices.

3. The method as in claim 1 further comprising the child sensor device using time division multiplexing for transmission of the message and the copy of the message to the control panel through the first and second parent sensor devices.

4. The method as in claim 1 further comprising the control panel transmitting a second message to the child sensor device through each of the first and second parent sensor devices, the second message from the control panel is transmitted during a third time period and on a third frequency to the child sensor device through the first parent sensor device and a copy of the second message is transmitted during a fourth time period and on a fourth frequency to the child sensor device through the second parent sensor device, wherein the third and fourth time periods and the third and fourth frequencies are all different, and wherein the third and fourth time periods are directly adjacent to one another in time.

5. The method as in claim 4 further comprising the second parent sensor device beginning the transmission of the copy of second message to the child sensor device immediately after the first parent sensor device completes the transmission of the second message to the child sensor device.

6. The method as in claim 4 further comprising the first and second parent sensor devices using frequency hopping for transmission of the second message and the copy of the second message from the control panel to the child sensor device.

7. The method as in claim 1 further comprising the at least first and second parent sensor devices monitoring for interference on a primary channel set including the first frequency during the first time period and the second frequency during the second time period.

8. The method as in claim 7 further comprising at least one of the first and second parent sensor devices detecting interference on the primary channel set and moving to a secondary channel set.

9. The method as in claim 8 wherein the secondary channel set further comprises extreme edges of a corresponding frequency band.

10. The method as in claim 9 further comprising the first and second parent sensor devices monitoring the primary and secondary channel sets for interference.

11. The method as in claim 4 further comprising at least one of the first and second parent sensor devices beamforming the second message to the child sensor device.

12. An apparatus for transmitting a message from a wireless sensor device among a plurality of wireless sensor devices configured in a wireless network in a security system, the apparatus comprising:
a plurality of wireless sensor devices coupled to a control panel of the security system, the plurality of wireless sensor devices configured into the wireless network that protects a secured area, wherein at least one wireless sensor device of the plurality of wireless sensor devices being a child sensor device that communicates with the control panel through at least first and second parent sensor devices;
an environmental sensor of the child sensor device measuring an environmental parameter within the secured area; and
a transmitter of the child sensor device transmitting the message including at least the measured environmental parameter to the control panel through each of the at least first and second parent sensor devices,
wherein the message is transmitted using a first channel during a first time period and on a first frequency to the first parent sensor device and a copy of the message is transmitted using a second channel during a second time period and on a second frequency to the second parent sensor device,
wherein the first and second time periods and the first and second frequencies are all different,
wherein the first and second time periods are directly adjacent to one another in time, and wherein transmission to the second parent sensor device begins immediately after completing transmission to the first parent sensor device; and
wherein the first channel and the second channel are selected by a registration processor of the child sensor device during a registration process, to include the child sensor device in the wireless network, based on a respective set of channels available of the first and second parent sensor devices for the child sensor device to communicate with the control panel through the first and second parent sensor devices.

13. The apparatus as in claim 12 further comprising a processor of the child sensor device that uses frequency hopping for transmission of the message and the copy of the message to the control panel through the first and second parent sensor devices.

14. The apparatus as in claim 12 further comprising a processor of the child sensor device that uses frequency hopping and time division multiplexing for transmission of the message and the copy of the message to the control panel through the first and second parent sensor devices.

15. The apparatus as in claim 12 further comprising at least one of the first and second parent sensor devices receiving the message through at least two different antennas associated with the respective first and second parent sensor devices using beamforming.

16. An apparatus for transmitting a message from a wireless sensor device among a plurality of wireless sensor devices configured in a wireless network in a security system, the apparatus comprising:
a plurality of wireless sensor devices coupled to a control panel of the s

Assignees

• Honeywell Int Inc

Inventors

• Kore Vinayak Sadashiv
• Rizwan Mohammed
• Biswas Gourango
• Berezowski Andrew G

Classifications

• H04W24/02 Primary

  Arrangements for optimising operational condition · CPC title

• H04Q2209/40

  using a wireless architecture · CPC title

• H04W4/38

  for collecting sensor information · CPC title

• G08B29/18

  Prevention or correction of operating errors (G08B29/02, G08B29/12 take precedence) · CPC title

• H04Q9/00

  Arrangements in telecontrol or telemetry systems for selectively calling a substation from a main station, in which substation desired apparatus is selected for applying a control signal thereto or for obtaining measured values therefrom · CPC title