Management of Default Data Subscription (DDS) in multi-subscriber identity module devices

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:
• reject the permanent DDS switch request;
• buffer a first permanent DDS switch recommendation;
• and
• clear the first permanent DDS switch recommendation in response to generating a second permanent DDS switch recommendation that is different from the first permanent DDS switch recommendation.

A method of wireless communication performed by a user equipment (UE), the method comprising:

• operating in a Dual SIM Dual Active (DSDA) mode or a Dual SIM Dual Standby (DSDS) mode in which a first subscriber identity module (SIM) is designated as a default data subscription (DDS);
• performing a temporary DDS switch;
• receiving a permanent DDS switch request from one or more processors of the UE;
• confirming presence of a buffered DDS switch recommendation at a modem of the UE;
• converting the temporary DDS switch to a permanent DDS switch in response to the permanent DDS switch request from the one or more processors;
• and
• sending a permanent DDS switch confirmation to the one or more processors.

A method of wireless communication performed by a user equipment (UE), the method comprising:

• operating in a Dual SIM Dual Active (DSDA) mode or a Dual SIM Dual Standby (DSDS) mode in which a first subscriber identity module (SIM) is designated as a default data subscription (DDS);
• performing a temporary DDS switch;
• receiving a permanent DDS switch request from one or more processors of the UE;
• rejecting the permanent DDS switch request;
• buffering a first permanent DDS switch recommendation;
• and
• clearing the first permanent DDS switch recommendation in response to generating a second permanent DDS switch recommendation that is different from the first permanent DDS switch recommendation.