Wireless networks for highly dependable applications

Patent metadata

Field	Value
Publication number	US-9408250-B2
Application number	US-24637008-A
Country	US
Kind code	B2
Filing date	Oct 6, 2008
Priority date	Oct 8, 2007
Publication date	Aug 2, 2016
Grant date	Aug 2, 2016

Abstract

A wireless communication system comprises one or more control units operable to transmit control signals, a plurality of actuators responsive to the control signals, and a plurality of sensors operable to transmit sensor data used by the one or more control units in generating the control signals. Each of the sensors, actuators, and one or more control units are located at a fixed position in the system relative to one another. Each of the plurality of sensors and each of the plurality of actuators are coupled to at least one of the one or more control units via a plurality of wireless paths. Each of the plurality of sensors are operable to transmit the sensor data in an assigned time slot to at least one of the one or more control units over a plurality of wireless channels in each of the plurality of wireless paths. The number of channels in each of the plurality of wireless paths is determined based, at least in part, on a worst-case estimate of potential interference, and each of the plurality of sensors is operable to pseudo-randomly switch the plurality of channels over which the sensor data is transmitted.

First claim

What is claimed is:

1. A wireless communication system comprising:
one or more control units operable to transmit control signals;
a plurality of actuators responsive to the control signals;
a plurality of sensors operable to transmit sensor data used by the one or more control units in generating the control signals;
wherein each of the sensors, actuators, and one or more control units are located at a fixed position in the system relative to one another;
wherein each of the plurality of sensors and each of the plurality of actuators are coupled to at least one of the one or more control units via a plurality of wireless paths;
wherein each of the plurality of sensors are operable to transmit the sensor data in an assigned time slot to at least one of the one or more control units over a plurality of wireless channels in each of the plurality of wireless paths;
wherein the number of channels in each of the plurality of wireless paths is determined based, at least in part, on a worst-case estimate of potential interference; and
wherein each of the plurality of sensors is operable to pseudo-randomly switch the plurality of channels over which the sensor data is transmitted.

2. The wireless communication system of claim 1 , wherein each of the plurality of sensors is operable to transmit a copy of the sensor data in each of a plurality of assigned time slots.

3. The wireless communication system of claim 1 , wherein each of the plurality of sensors is operable to select an encoding technique for each of the plurality of channels based on a worst bit error rate for each channel.

4. The wireless communication system of claim 3 , wherein each of the plurality of sensors is operable to select one of a Reed-Solomon encoding technique, a convolution encoding technique, and a BCH encoding technique.

5. The wireless communication system of claim 3 , wherein each of the plurality of sensors is operable to transmit the sensor data using a direct sequence spread spectrum (DSSS) technique for each of the plurality of channels.

6. The wireless communication system of claim 1 , wherein each of the plurality of sensors is operable to pseudo-randomly switch the channels over which the sensor data is transmitted after each bit of the sensor data is transmitted.

7. The wireless communication system of claim 1 , wherein each of the one or more control units is operable to implement a voting scheme based on the sensor data received over each of the plurality of wireless paths.

8. A wireless communication system comprising:
a plurality of nodes, each of the plurality of nodes coupled to a plurality of the other nodes via corresponding wireless links;
wherein each of the nodes is located at a fixed position in the system relative to the other nodes;
wherein each of the plurality of nodes is operable to transmit a wireless signal over a plurality of channels to a destination node of the plurality of nodes via one or more other nodes in each of a plurality of wireless paths, each wireless path comprising at least one segment;
wherein the number of channels in each of the plurality of wireless paths is determined based, at least in part, on an estimate of potential interference;
wherein each other node in each wireless path is operable to forward the received wireless signal;
wherein each of the plurality of nodes is further operable to pseudo-randomly switch the channels over which the wireless signal is transmitted; and
wherein each of the plurality of nodes is operable to transmit redundant copies of the wireless signal at different moments in time.

9. The wireless communication system of claim 8 , wherein each of the plurality of nodes is operable to pseudo-randomly switch the channels over which the wireless signal is transmitted.

10. The wireless communication system of claim 8 , wherein each of the plurality of nodes is operable to transmit the wireless signal according to a Time Division Multiple Access (TDMA) schedule.

11. The wireless communication system of claim 8 , wherein each of the plurality of nodes are operable to retransmit unsuccessful transmissions for each channel.

12. The wireless communication system of claim 8 , wherein each of the plurality of nodes is operable to select an encoding technique for each of the plurality of channels.

13. The wireless communication system of claim 12 , wherein each of the plurality of nodes is operable to select an encoding technique for each of the plurality of channels based on a worst bit error rate for each channel.

14. The wireless communication system of claim 12 , wherein each of the plurality of nodes is operable to select one of a Reed-Solomon encoding technique, a convolution encoding technique, and a BCH encoding technique.

15. The wireless communication system of claim 8 , wherein each of the plurality of nodes is operable to transmit the wireless signal using a direct sequence spread spectrum (DSSS) technique for each of the plurality of channels.

16. The wireless communication system of claim 8 , wherein the destination node is operable to implement a voting scheme based on the wireless signal received over each of the plurality of wireless paths.

Assignees

• Yi Yunjung
• Thomas Vicraj T
• Muldoon Kelly P
• Franceschini Michael R
• Honeywell Int Inc

Inventors

• Yi Yunjung
• Thomas Vicraj T
• Muldoon Kelly P
• Franceschini Michael R

Classifications

• H04W74/04

  Scheduled access (hybrid access H04W74/02) · CPC title

• G08C2201/63

  Redundant transmissions · CPC title

• H04W84/18 Primary

  Self-organising networks, e.g. ad-hoc networks or sensor networks · CPC title

• G08C2201/40

  Remote control systems using repeaters, converters, gateways · CPC title

• G08C2201/50

  Receiving or transmitting feedback, e.g. replies, status updates, acknowledgements, from the controlled devices · CPC title