US 11,910,479 B2
Management of Default Data Subscription (DDS) in multi-subscriber identity module devices
Can Zhao, San Diego, CA (US); Suli Zhao, San Diego, CA (US); Xinchen Zhang, San Diego, CA (US); Reza Shahidi, San Diego, CA (US); Arnaud Meylan, San Diego, CA (US); Liping Shen, San Diego, CA (US); Ajith Tom Payyappilly, San Diego, CA (US); Juan Zhang, San Diego, CA (US); and Tom Chin, San Diego, CA (US)
Assigned to QUALCOMM Incorporated, San Diego, CA (US)
Filed by QUALCOMM Incorporated, San Diego, CA (US)
Filed on Sep. 7, 2021, as Appl. No. 17/447,035.
Prior Publication US 2023/0071751 A1, Mar. 9, 2023
Int. Cl. H04W 8/18 (2009.01); H04M 1/72448 (2021.01)
CPC H04W 8/18 (2013.01) [H04M 1/72448 (2021.01)] 28 Claims
OG exemplary drawing
 
1. A user equipment (UE), comprising:
a first subscriber identity module (SIM) associated with a first service provider subscription and a second SIM associated with a second service provider subscription;
a modem configured to interface with a network unit; and
one or more processors configured, individually or in any combination, to interface with the modem and to access the first SIM and the second SIM, wherein the modem is further configured to:
operate in a Dual SIM Dual Active (DSDA) mode or a Dual SIM Dual Standby (DSDS) mode in which the first SIM is designated as a default data subscription (DDS);
perform a temporary DDS switch;
receive a permanent DDS switch request from the one or more processors;
confirm presence of a buffered DDS switch recommendation at the modem;
convert the temporary DDS switch to a permanent DDS switch in response to the permanent DDS switch request from the one or more processors; and
send a permanent DDS switch confirmation to the one or more processors.