Method and system improving the reliability of wireless fire detection systems

Patent metadata

Field	Value
Publication number	US-9730091-B2
Application number	US-201514926424-A
Country	US
Kind code	B2
Filing date	Oct 29, 2015
Priority date	Oct 29, 2015
Publication date	Aug 8, 2017
Grant date	Aug 8, 2017

Abstract

A system is provided that includes a plurality of sensors that detect threats within a secured geographic area, a control panel that monitors the plurality of sensors for activation, a primary control unit that forms a primary mesh network coupling the plurality of sensors with the control panel based upon relative link quality, wherein the primary mesh network is defined by a primary routing table, and a redundant control unit that forms a secondary mesh network coupling the plurality of sensors with the control panel based upon the relative link quality, wherein the secondary mesh network includes a respective relationship of each of the plurality of sensors defined by a secondary routing table, wherein the redundant control unit is located in a different geographic location than the primary control unit within the secured geographic area, and wherein the secondary routing table is different than the primary routing table.

First claim

The invention claimed is:

1. An apparatus comprising:
a plurality of sensors that detect threats within a secured geographic area;
a control panel that monitors the plurality of sensors for activation;
a primary control unit coupled to the control panel;
a mesh network coupled to the primary control unit and formed by respective links between each of the plurality of sensors; and
a redundant control unit coupled to the control panel, the primary control unit, and the mesh network,
wherein a type of the respective links for each of the plurality of sensors includes at least one of a first direct link between a respective one of the plurality of sensors and the primary control unit, a second direct link between the respective one of the plurality of sensors and the redundant control unit, and an indirect link between the respective one of the plurality of sensors and a different one of the plurality of sensors,
wherein the type of the respective links for the respective one of the plurality of sensors is determined by the respective one of the plurality of sensors based on a relative location of the respective one of the plurality of sensors to other members of the plurality of sensors, the primary control unit, and the redundant control unit,
wherein each of the plurality of sensors establishes, through the respective links, a respective first connection to the primary control unit and a respective second connection to the primary control unit different than the respective first connection based upon link quality and stores first data representing the respective first connection and the respective second connection in a primary routing table,
wherein each of the plurality of sensors establishes, through the respective links, a respective third connection to the redundant control unit and a respective fourth connection to the redundant control unit different than the respective third connection based upon the link quality and stores second data representing the respective third connection and the respective fourth connection in a secondary routing table,
wherein the primary control unit is located in a first geographic location within the secured geographic area, and the redundant control unit is located in a second, different geographic location within the secured geographic area, and
wherein the secondary routing table is different than the primary routing table.

2. The apparatus as in claim 1 wherein the second, different geographic location for the redundant control unit is based upon the respective first connection and the respective second connection of each of the plurality of sensors.

3. The apparatus as in claim 1 further comprising a security system.

4. The apparatus as in claim 1 wherein the plurality of sensors include one or more of a fire sensor and an intrusion sensor.

5. The apparatus as in claim 1 wherein the control panel is located at a third, different geographic location than both the primary control unit and the redundant control unit.

6. The apparatus as in claim 1 wherein a processor of the control panel periodically tests the respective first connection and the respective second connection between the primary control unit and each of the plurality of sensors and, upon detecting a failure, sends a command activating the redundant control unit.

7. The apparatus as in claim 1 further comprising a first processor of the control panel that performs an end-to-end health check of the mesh network.

8. The apparatus as in claim 7 further comprising a respective transceiver within each of the plurality of sensors that transmits the link quality of the respective one of the plurality of sensors to the other members of the plurality of sensors, the primary control unit, and the redundant control unit.

9. The apparatus as in claim 8 further comprising a second processor of the primary control unit and a third processor of the redundant control unit that receive the link quality from each the plurality of sensors and transmit a health message to the control panel, the health message indicative of an overall health of the mesh network.

10. An apparatus comprising:
a security system that protects a secured geographic area;
a plurality of sensors of the security system that detect threats within the secured geographic area;
a control panel of the security system that monitors the plurality of sensors for activation;
a primary control unit coupled to the control panel;
a mesh network coupled to the primary control unit and formed by respective links between each of a plurality of wireless transceivers associated with a respective one of the plurality of sensors; and
a redundant control unit coupled to the control panel, the primary control unit, and the mesh network,
wherein a type of the respective links for a respective one of the plurality of wireless transceivers includes at least one of a first direct link between the respective one of the plurality of wireless transceivers and the primary control unit, a second direct link between the respective one of the plurality of wireless transceivers and the redundant control unit, and at least one indirect link between the respective one of the plurality of wireless transceivers and a different one of the plurality of wireless transceivers,
wherein the type of the respective links for the respective one of the plurality of wireless transceivers is determined by a respective one of the plurality of sensors associated with the respective one of the plurality of wireless transceivers based on a relative location of the respective one of the plurality of sensors to other members of the plurality of sensors, the primary control unit, and the redundant control unit,
wherein each of the plurality of sensors establishes, through the respective links and the respective one of the plurality of wireless transceivers, a respective first connection to the primary control unit and a respective second connection to the primary control unit different than the respective first connection based upon link quality and stores first data representing the respective first connection and the respective second connection in a primary routing table,
wherein each of the plurality of sensors establishes, through the respective links and the respective one of the plurality of wireless transceivers, a respective third connection to the redundant control unit and a respective fourth connection to the redundant control unit different than the respective third connection based upon the link quality and stores second data representing the respective third connection and the respective fourth connection in a secondary routing table,
wherein the primary control unit is located in a first geographic location within the secured geographic area, and the redundant control unit is located in a second, different geographic location within the secured geographic area, and
wherein the secondary routing table is different than the primary routing table.

11. The system as in claim 10 further comprising a processor of the control panel that transmits, over the mesh network, a wireless beacon synchronizing each of the plurality of wireless transceivers to the control panel.

12. The system as in claim 11 further comprising a repeating superframe of a time division multiple access slot used by the plurality of wireless transceivers for exchanging messages between the control panel and the plurality of sensors.

13. The system as in claim 10 wherein each of the plurality of sensors adjusts the respective first connection, the respective second connection, the respective third connection, and the respective fourth connection based

Assignees

• Honeywell Int Inc

Inventors

• Sharma Gourav
• Kore Vinayak Sadashiv
• G Naveen
• M Shreelatha
• Vaidyanathan Deepak Sundar

Classifications

• G08B19/005

  combined burglary and fire alarm systems · CPC title

• G08B29/18

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

• H04W4/005

  Electricity · mapped topic

• H04L41/0836

  to enhance reliability, e.g. reduce downtime · CPC title

• H04W24/04 Primary

  Arrangements for maintaining operational condition · CPC title