US 11,729,861 B2
Fast role switch between bluetooth true wireless stereo (TWS) earbuds
Dishant Srivastava, Bangalore (IN); and Mayank Batra, Cambridge (GB)
Assigned to QUALCOMM Incorporated, San Diego, CA (US)
Filed by QUALCOMM Incorporated, San Diego, CA (US)
Filed on May 13, 2021, as Appl. No. 17/319,329.
Application 17/319,329 is a continuation of application No. 16/401,917, filed on May 2, 2019, granted, now 11,013,062.
Claims priority of application No. 201941003881 (IN), filed on Jan. 31, 2019.
Prior Publication US 2021/0352766 A1, Nov. 11, 2021
This patent is subject to a terminal disclaimer.
Int. Cl. H04L 12/28 (2006.01); H04W 84/20 (2009.01); H04W 76/14 (2018.01); H04W 36/30 (2009.01); H04W 52/02 (2009.01); H04W 76/23 (2018.01); H04J 1/16 (2006.01)
CPC H04W 84/20 (2013.01) [H04W 36/30 (2013.01); H04W 52/0274 (2013.01); H04W 52/0296 (2013.01); H04W 76/14 (2018.02); H04W 76/23 (2018.02)] 17 Claims
OG exemplary drawing
 
1. A role change method between a first earbud and a second earbud, comprising:
obtaining, by the second earbud, a clock (CLK) signal of the first earbud, wherein the first earbud is a master device, and the second earbud is a slave device;
obtaining, by the second earbud, a Bluetooth slot boundary signal of the first earbud;
receiving, by the second earbud, a role change request from the first earbud, wherein the role change request is based on determining that a remaining battery charge at the first earbud is less than a remaining battery charge at the second earbud;
sending, by the second earbud, a role change acceptance command to the first earbud; and
changing roles of the first and second earbuds in less than 80 slots from the role change request, wherein the first earbud becomes the slave device, and the second earbud becomes the master device.