Wireless monitoring and alarm system

• US 8,194,592 B2
• Filed: 01/15/2009
• Issued: 06/05/2012
• Est. Priority Date: 01/15/2009
• Status: Active Grant

• Current Assignee: Honeywell International Inc.
• Original Assignee: Honeywell International Inc.
• Inventors: Berezowski, Andrew G., Kore, Vinayak Sadashiv, Raravi, Channabasavarai, Rizwan, Mohammed, Bhat, Ishware
• Primary Examiner(s): Yao, Kwang B
• Assistant Examiner(s): LIU, JUNG
• Application Number:
  US12/354,498
• Publication Number:
  US 20100177684A1
• Time in Patent Office: 1,237 Days
• Field of Search: 370/203, 370204-215, 370229-240, 370241-253, 370310-337, 370338-350, 370/395.1, 370/395.3, 370/395.4, 370/395.41, 370/395.42, 370/395.5, 370/395.52, 370/395.53, 370412-421, 370431-457, 370458-463, 370464-497, 370498-529
• US Class Current: 370/328
• CPC Class Codes: H04W 28/06 Optimizing the usage of the radio link, e.g. header compression, information sizing , discarding information system modifying transmission characteristic according to link quality by modifying frame length H04L1/0007; dynamic adaptation of the packet size for flow control or congestion control H04L47/365
• CPC Class Codes: H04W 84/18 Self-organising networks, e.g. ad-hoc networks or sensor networks

Abstract

A monitoring system includes a multi-hop time division multiple access communication system to link a control unit wirelessly and redundantly with a plurality of modules. Communications to modules occur during predetermined time slots in a first portion of a selected frame. Communications from the modules occur during corresponding time slots during a second portion of the frame.

Claims

1. A wireless communications system comprising:

a control unit which includes a wireless transceiver and control software to implement a wireless multi-hop communications protocol; and

a plurality of wireless devices where each device includes software to implement the wireless communication protocol with one of, the control unit and at least one other child member of the plurality, or, at least two other members of the plurality where a selected device communicates with at least one child device and at least one parent device,

wherein each child device includes software that implements the protocol with one of, two parent devices, or, one parent device and the control unit,

wherein information from different child devices is transmitted to respective parent devices

wherein each of the respective parent devices aggregates parent data with the information received from the different child devices, and

wherein each of the respective parent devices transmits a single packet with the aggregated parent data and information from the different child devices and

where at least some of the devices become active for a predetermined time interval during selected time slots to receive incoming data, and in the absence thereof, return to an inactive state.

2. A system as in claim 1 where the child devices include software to transmit messages, on a time slot basis, before the respective parent'"'"'s transmission time slot.

3. A system as in claim 1 where the devices include software to transmit messages, on a time slot basis to at least two parent devices and where if one parent fails, transmission continues with the other parent and where a replacement parent is also sought.

4. A system as in claim 1 wherein commands from respective parent devices are received, separated and sent to respective child devices.

5. A wireless ambient condition detecting system comprising:

a control unit which includes a wireless transceiver and control software to implement a wireless multi-hop communications protocol; and

a plurality of devices where each device includes software to implement the wireless communication protocol with one of, the control unit and at least one other child member of the plurality, or, at least two other members of the plurality where a selected device communicates with at least one child device and at least one parent device,

wherein each child device includes software that implements the protocol with one of, two parent devices, or, one parent device and the control unit,

wherein alarm/status information from different child devices is transmitted to respective parent devices,

wherein each of the respective parent devices aggregates parent data with the alarm/status information received from the different child devices, and

wherein each of the respective parent devices transmits a single packet with the aggregated parent data and alarm/status information from the different child devices and

where at least some of the devices become active for a predetermined time interval during selected time slots to receive incoming data, and in the absence thereof, return to an inactive state.

6. A system as in claim 5 where the plurality includes output devices, and, where the output devices are selected from a class which includes at least visual output devices, and audible output devices.

7. A system as in claim 6 where the input devices are selected from a class which includes at least smoke detectors, gas detectors, thermal detectors, fire detectors, flow detectors, pull boxes, position detectors and motion detectors.

8. A system as in claim 7 where at least some of the devices include at least one ambient condition input device and at least one visual or audible output device.

9. A system as in claim 5 where the devices include software to transmit a command, on a time slot basis, to a plurality of child devices.

10. A system as in claim 5 where the devices include software to transmit responses, on a time slot basis to at least two parent devices.

11. A system as in claim 5 which includes circuitry to automatically, or, otherwise adjust at least one of time slot duration, or, packet size.

12. A system as in claim 11 where members of the plurality include circuitry that receives and rebroadcasts the frames to other members of the plurality.

13. A system as in claim 12 where at least some of the frames include a request section directed to members of the plurality, at least some members of the plurality include second circuitry responsive to a detector specific request in the request section.

14. A system as in claim 5 wherein commands from each of the respective parent devices are received, split and sent to respective child devices.

15. A system as in claim 11 which includes a frequency varying process.