US 12,035,405 B2
Methods and systems for low power reconnection
Dong Zheng, Saratoga, CA (US); Amit Shukla, Fremont, CA (US); and Gang Lu, Pleasanton, CA (US)
Assigned to Meta Platforms Technologies, LLC, Menlo Park, CA (US)
Filed by Meta Platforms Technologies, LLC, Menlo Park, CA (US)
Filed on Jan. 22, 2021, as Appl. No. 17/155,602.
Prior Publication US 2022/0240339 A1, Jul. 28, 2022
Int. Cl. H04W 76/19 (2018.01); H04W 40/24 (2009.01); H04W 52/02 (2009.01)
CPC H04W 76/19 (2018.02) [H04W 40/244 (2013.01); H04W 52/0216 (2013.01); H04W 52/0251 (2013.01)] 17 Claims
OG exemplary drawing
 
7. A first device comprising:
a wireless interface configured to communicate with a second device through a wireless communication link; and
one or more processors coupled to the wireless interface, the one or more processors configured to:
cause the wireless interface to enter a wake up mode from a sleep mode,
obtain, in response to entering the wake up mode, stored information indicating a wireless channel previously used to communicate with the second device, the first device to monitor for a beacon frame from the second device, through the wireless channel previously used to communicate with the second device indicated by the stored information,
cause the wireless interface to receive the beacon frame from the second device, through the wireless channel previously used to communicate with the second device indicated by the stored information, and
cause the wireless interface to transmit an association frame to the second device, in response to receiving the beacon frame,
wherein the second device is an access point (AP) and the first device is a non-AP station (STA),
wherein the stored information indicating the wireless channel includes a frequency band of the wireless channel and timing of a previous communication between the first device and the second device,
wherein the first device and the second device are configured to resume wireless communication without channel scanning.
 
13. A first device comprising:
a wireless interface configured to communicate with a second device through a wireless communication link; and
one or more processors coupled to the wireless interface, the one or more processors configured to:
determine a time period,
cause the wireless interface to perform, within a listening interval of the second device, a plurality of switches between a wake up mode and a sleep mode periodically according to the time period, until an association is completed with the second device to resume wireless communication of data, and
cause, for each switch to the wake up mode from the sleep mode according to the time period, the wireless interface to transmit an association frame to the second device according to stored information indicating a wireless channel previously used to communicate with the second device, the association frame to establish the wireless communication link with the second device,
wherein the second device is an access point (AP) and the first device is a non-AP station (STA),
wherein the stored information indicating the wireless channel includes a frequency band of the wireless channel and timing of a previous communication between the first device and the second device,
wherein the first device and the second device are configured to resume wireless communication without channel scanning.