IP Library › Granted Patent US 11,514,926
Granted Patent B2
US 11,514,926 · App. 17/091,215 · Granted Nov 29, 2022

Low power mode for speech capture devices

Inventors: Dibyendu Nandy (San Ramon, CA); Om Prakash Gangwal (Fremont, CA)
Assignee: Amazon Technologies, Inc.
G10L25/21G10L15/16G10L15/22G10L21/0232G10L13/02G10L2021/02166
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Quick Facts
Patent No.
US 11,514,926
App. No.
17/091,215
Filed
Nov 6, 2020
Granted
Nov 29, 2022
Kind
B2
Art Unit
2675
USPC
704/270
Abstract

A system configured to enable a Wi-Fi processor to enter a low power mode (LPM) for short periods of time without compromising functionality is provided. A device reduces power consumption by enabling the Wi-Fi processor to enter LPM with scheduled wakeup events to enable specific functionality. In some examples, the Wi-Fi processor toggles between LPM and an active mode based on a first duty cycle to enable new device provisioning. The first duty cycle corresponds to a time required to scan a plurality of wireless channels, waking the Wi-Fi processor at a first frequency to monitor for incoming probe requests. In other examples, the Wi-Fi processor uses a second duty cycle chosen to maintain time synchronicity between a time master device and time follower devices. The device sets the second duty cycle to wake the Wi-Fi processor at a second frequency to exchange data packets with synchronized devices.

Claims (99)

1. A computer-implemented method, the method comprising:

operating a wireless interface component of a first device in a first mode associated with first power consumption;

determining that a first period of time has elapsed;

after the first period of time has elapsed, operating the wireless interface component in a second mode associated with second power consumption that is lower than the first power consumption;

determining that a second period of time has elapsed;

after the second period of time has elapsed, operating the wireless interface component in the first mode;

receiving, by the wireless interface component while operating in the first mode, a probe request from a second device;

sending, to the second device, a probe response;

establishing a wireless communication session between the first device and the second device; and

sending network data to the second device during the wireless communication session.

2. The computer-implemented method of claim 1 , further comprising, prior to determining that the first period of time has elapsed:

determining a first number of wireless channels associated with a wireless network;

determining a length of time associated with sending a second probe request on one of the first number of wireless channels; and

determining the second period of time using the first number of wireless channels and the length of time.

3. The computer-implemented method of claim 1 , further comprising, prior to determining that the first period of time has elapsed:

determining the second period of time, wherein the first period of time is different than the second period of time.

4. The computer-implemented method of claim 1 , further comprising, prior to receiving the probe request:

establishing, by the first device, a connection to a wireless network using the network data.

5. The computer-implemented method of claim 1 , further comprising:

sending, to a remote device after receiving the probe request, a verification request associated with the second device;

receiving, from the remote device, first data; and

generating the probe response using the first data.

6. The computer-implemented method of claim 1 , further comprising:

sending, to a remote device after receiving the probe request, a verification request associated with the second device;

receiving, from the remote device, first data indicating a network identifier;

creating a wireless network using the network identifier; and

generating the probe response corresponding to the wireless network.

7. The computer-implemented method of claim 1 , further comprising:

establishing, by the first device prior to receiving the probe request, a connection to a wireless network associated with an access point; and

receiving, from a remote device via the wireless network, the network data, wherein the network data corresponds to the wireless network.

8. The computer-implemented method of claim 1 , further comprising:

identifying first wakeup events that are periodically received by the first device on a first schedule having a first time interval between the first wakeup events;

identifying second wakeup events periodically generated by the first device on a second schedule having a second time interval between the second wakeup events; and

synchronizing the second schedule with the first schedule.

9. A system comprising:

at least one processor; and

memory including instructions operable to be executed by the at least one processor to cause the system to:

operate a wireless interface component of a first device in a first mode associated with first power consumption;

determine, by the first device, a first number of devices that are synchronized using a first clock associated with the first device, the first number of devices including a second device and a third device;

determine a first period of time during which the first device is configured to communicate with the first number of devices;

determine a second period of time during which the wireless interface component is configured to operate in a second mode associated with second power consumption that is lower than the first power consumption;

receive, by the wireless interface component while operating in the first mode, first data from the second device;

receive, by the wireless interface component while operating in the first mode, second data from the third device;

operate the wireless interface component in the second mode;

determine that the second period of time has elapsed;

after the second period of time has elapsed, operate the wireless interface component in the first mode; and

receive, by the wireless interface component while operating in the first mode, third data from the second device.

10. The system of claim 9 , wherein the memory further comprises instructions that, when executed by the at least one processor, further cause the system to:

receive, by the wireless interface component, the third data, the third data including a first data packet and a first timestamp associated with the second device transmitting the first data packet; and

send, by the wireless interface component to the second device, fourth data including the first data packet, the first timestamp, and a second timestamp corresponding to receipt of the third data by the first device.

11. The system of claim 9 , wherein the memory further comprises instructions that, when executed by the at least one processor, further cause the system to:

determine a maximum number of time slots available to the first device to communicate with the first number of devices while maintaining synchronization, each of the time slots associated with a third period of time;

determine the first period of time by multiplying the first number of devices and the third period of time;

determine a difference between the maximum number of time slots and the first number of devices; and

determine the second period of time by multiplying the difference and the third period of time.

12. The system of claim 9 , wherein the memory further comprises instructions that, when executed by the at least one processor, further cause the system to:

determine a time interval corresponding to a frequency with which the second device synchronizes with the first device; and

determine the second period of time by subtracting the first period of time from the time interval.

13. The system of claim 9 , wherein the memory further comprises instructions that, when executed by the at least one processor, further cause the system to:

receive, during a first portion of the first period of time, the first data from the second device;

send, during the first portion of the first period of time, fourth data to the second device;

receive, during the first portion of the first period of time, the second data from the third device; and

send, during the first portion of the first period of time, fifth data to the third device.

14. The system of claim 9 , wherein the first clock is synchronized with a second clock of the second device using a first synchronization value, and the memory further comprises instructions that, when executed by the at least one processor, further cause the system to:

receive an instruction to synchronize the first clock with the second clock using a second synchronization threshold value that is smaller than the first synchronization threshold value; and

set the second period of time equal to zero.

15. The system of claim 9 , wherein the memory further comprises instructions that, when executed by the at least one processor, further cause the system to:

determine, by the second device, a third period of time during which the second device is configured to communicate with the first device;

determine, by the second device, a fourth period of time during which a second wireless interface component of the second device is configured to operate in the second mode;

operate the wireless interface component in the second mode;

determine that the fourth period of time has elapsed;

after the fourth period of time has elapsed, operate the second wireless interface component in the first mode; and

send, by the second wireless interface component while operating in the first mode, the third data to the first device.

16. The system of claim 9 , wherein the memory further comprises instructions that, when executed by the at least one processor, further cause the system to:

identify first wakeup events that are periodically received by the first device on a first schedule having a first time interval between the first wakeup events;

identify second wakeup events periodically generated by the first device on a second schedule having a second time interval between the second wakeup events; and

synchronize the second schedule with the first schedule.

17. A computer-implemented method, the method comprising:

operating a wireless interface component of a first device in a first mode associated with first power consumption;

determining, by the first device, a first number of devices that are synchronized using a first clock associated with the first device, the first number of devices including a second device and a third device;

determining a first period of time during which the first device is configured to communicate with the first number of devices;

determining a second period of time during which the wireless interface component is configured to operate in a second mode associated with second power consumption that is lower than the first power consumption;

receiving, by the wireless interface component while operating in the first mode, first data from the second device;

receiving, by the wireless interface component while operating in the first mode, second data from the third device;

operating the wireless interface component in the second mode;

determining that the second period of time has elapsed;

after the second period of time has elapsed, operating the wireless interface component in the first mode; and

receiving, by the wireless interface component while operating in the first mode, third data from the second device.

18. The computer-implemented method of claim 17 , further comprising:

receiving, by the wireless interface component, the third data, the third data including a first data packet and a first timestamp associated with the second device transmitting the first data packet; and

sending, by the wireless interface component to the second device, fourth data including the first data packet, the first timestamp, and a second timestamp corresponding to receipt of the third data by the first device.

19. The computer-implemented method of claim 17 , further comprising:

determining a maximum number of time slots available to the first device to communicate with the first number of devices while maintaining synchronization, each of the time slots associated with a third period of time;

determining the first period of time by multiplying the first number of devices and the third period of time;

determining a difference between the maximum number of time slots and the first number of devices; and

determining the second period of time by multiplying the difference and the third period of time.

20. The computer-implemented method of claim 17 , further comprising:

determining a time interval corresponding to a frequency with which the second device synchronizes with the first device; and

determining the second period of time by subtracting the first period of time from the time interval.

Assignments (1)
ASSIGNMENT OF ASSIGNOR'S INTEREST Recorded Nov 6, 2020
From: NANDY, DIBYENDU; GANGWAL, OM PRAKASH
To: AMAZON TECHNOLOGIES, INC.
Reel/Frame 054296/0683 →
Continuity (2)
Provisional Application 63042776 · Jun 23, 2020
Related Publication 20210398551A1 · Dec 23, 2021
Cited By (2)
US 12,444,418 US 12,664,984