WIRELESS NETWORKS FOR HIGHLY DEPENDABLE APPLICATIONS

• US 20090097468A1
• Filed: 10/06/2008
• Published: 04/16/2009
• Est. Priority Date: 10/08/2007
• Status: Active Grant

• Current Assignee: Honeywell International Inc.
• Original Assignee: Honeywell International Inc.
• Inventors: Yi, Yunjung, Muldoon, Kelly P., Thomas, Vicraj T., Franceschini, Michael R.
• Granted Patent: US 9,408,250 B2
• Time in Patent Office: Days
• US Class Current: 370/347
• CPC Class Codes: G01D 21/00 Measuring or testing not otherwise provided for
• CPC Class Codes: G08C 17/02 using a radio link
• CPC Class Codes: G08C 2201/40 Remote control systems using repeaters, converters, gateways
• CPC Class Codes: G08C 2201/50 Receiving or transmitting feedback, e.g. replies, status updates, acknowledgements, from the controlled devices
• CPC Class Codes: G08C 2201/63 Redundant transmissions
• CPC Class Codes: H04W 74/04 Scheduled access hybrid access H04W74/02
• CPC Class Codes: H04W 84/18 Self-organising networks, e.g. ad-hoc networks or sensor networks

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.

Claims

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 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.

17. A method of wireless communication, the method comprising:

dynamically selecting an encoding technique from a plurality of available encoding techniques for each of a plurality channels;

encoding data to be transmitted using the selected encoding techniques;

transmitting the encoded data over each of the plurality of channels to a destination node via a plurality of wireless paths;

pseudo-randomly switching the plurality of channels over which the data is transmitted; and

transmitting each of a plurality of redundant copies of the data over the plurality of channels at a distinct moment in time to the destination node via the plurality of wireless paths.

18. The method of claim 17, wherein the number of channels is determined based on a worst-case estimate of potential interference.

19. The method of claim 17, wherein the encoding technique is dynamically selected based on the worst bit error rate for each channel.

20. The method of claim 17, wherein the plurality of channels over which the data is transmitted are pseudo-randomly switched after each bit of the data.