Radio Duty Cycle Minimization Techniques for Transmission-Initiated Wireless Multi-Hop Networks

• US 20120314739A1
• Filed: 06/08/2012
• Published: 12/13/2012
• Est. Priority Date: 06/10/2011
• Status: Active Grant

• Current Assignee: Texas Instruments, Inc.
• Original Assignee: Texas Instruments, Inc.
• Inventors: Bhadra, Sandeep, Lu, Xiaolin, Choi, Soon-Hyeok
• Granted Patent: US 9,001,870 B2
• Time in Patent Office: Days
• US Class Current: 375/219
• CPC Class Codes: H04W 40/246 Connectivity information discovery
• CPC Class Codes: H04W 52/0229 where the received signal is a wanted signal
• CPC Class Codes: H04W 52/0238 where the received signal is an unwanted signal, e.g. interference or idle signal
• CPC Class Codes: Y02D 30/70 in wireless communication networks

Abstract

The duration of receiver on-times may be minimized by sensing and reacting to communication channel power levels at intervals. When no energy is detected on the communication channel, then the receiver may be turned off for a channel sampling interval. If energy is detected on the channel, then the receiver may remain on to determine if a received message is associated with the device. Receiver on-time may also be minimized by adjusting the timing of messages used for broadcast messages sent by routing or other protocols. Broadcast messages, such as network routing topology messages, may be controlled in two phases. In a first phase, the broadcast messages are sent with at a high rate to allow nodes to join the network rapidly. In a second phase, the broadcast messages are sent with at a lower rate to minimize interference with data and other messages in the network.

Claims

1. A device, comprising:

a transmitter for sending signals to another device;

a receiver for receiving signals from another device;

a processor adapted to control the transmitter and receiver and to process the signals sent to or received from another device, the processor operating to;

set a broadcast message timer to a first interval during a first phase;

transmit a plurality of broadcast messages during the first phase at the first interval;

set the broadcast message timer to a second interval during a second phase; and

transmit a plurality of broadcast messages during the second phase at the second interval.

2. The device of claim 1, further comprising:

each of the first interval and the second interval comprising a series of strobe messages followed by a data packet message.

3. The device of claim 1, further comprising:

the broadcast message is a routing protocol control message.

4. The device of claim 3, further comprising:

the routing protocol control message is a DODAG Information Object (DIO) message, and the broadcast message timer is a DIO timer.

5. The device of claim 1, wherein a length of the second interval is a multiple of the length of the first interval.

6. The device of claim 1, wherein a duration of the first phase is a multiple of the first interval, and a duration of the second phase is a multiple of the second interval.

7. A method, comprising:

setting a broadcast message timer to a first interval during a first phase;

transmitting a plurality of broadcast messages during the first phase at the first interval;

setting the broadcast message timer to a second interval during a second phase; and

transmitting a plurality of broadcast messages during the second phase at the second interval.

8. The method of claim 7, further comprising:

each of the first interval and the second interval comprising a series of strobe messages followed by a data packet message.

9. The method of claim 7, further comprising:

the broadcast message is a routing protocol control message.

10. The method of claim 9, further comprising:

the routing protocol control message is a DODAG Information Object (DIO) message, and the broadcast message timer is a DIO timer.

11. The method of claim 7, wherein a length of the second interval is a multiple of the length of the first interval.

12. The method of claim 7, wherein a duration of the first phase is a multiple of the first interval, and a duration of the second phase is a multiple of the second interval.

13. The method of claim 7, wherein the broadcast timer is stored in a memory.

14. A non-transitory electronic storage medium having program instructions stored thereon that, upon execution by a processor within a device, cause the device to:

set a broadcast message timer to a first interval during a first phase;

transmit a plurality of broadcast messages during the first phase at the first interval;

set the broadcast message timer to a second interval during a second phase; and

transmit a plurality of broadcast messages during the second phase at the second interval.

15. The non-transitory electronic storage medium of claim 14, further comprising:

each of the first interval and the second interval comprising a series of strobe messages followed by a data packet message.

16. The non-transitory electronic storage medium of claim 14, further comprising:

the broadcast message is a routing protocol control message.

17. The non-transitory electronic storage medium of claim 14, further comprising:

the routing protocol control message is a DODAG Information Object (DIO) message, and the broadcast message timer is a DIO timer.

18. The non-transitory electronic storage medium of claim 14, wherein a length of the second interval is a multiple of the length of the first interval.

19. The non-transitory electronic storage medium of claim 15, wherein a duration of the first phase is a multiple of the first interval, and a duration of the second phase is a multiple of the second interval.

20. The non-transitory electronic storage medium of claim 14, wherein the broadcast timer is stored in a memory.