Method and device for optimizing cross sim calling in user equipment with multiple sims

A user equipment (UE) for cross subscriber identity module (SIM) calling, comprising:

• a plurality of SIMs including a first SIM and second SIM;
• memory comprising information about the plurality of SIMs;
• an application processor (AP), comprising at least one processing circuitry, including an evolved packet data gateway (ePDG);
• a communication processor (CP) comprising at least one processing circuitry;
• wherein the CP comprises an ePDG configured to be controlled by the ePDG at the AP of the UE,
• wherein the UE is configured to detect an event associated with the first SIM of the UE, and establish cross SIM calling for the second SIM of the UE,
• wherein the AP is configured to initiate an evolved packet data gateway (ePDG) at the CP of the UE based on the cross SIM calling being established;
• and
• wherein the CP is configured to receive cross SIM data packets through the ePDG of the CP and process the cross SIM data packets.

A non-transitory computer-readable storage medium storing instructions that cause a user equipment (UE) to perform operations including:

• detecting, by an application processor (AP) of the UE, an event associated with a first SIM of the UE, and establishing cross SIM calling for a second SIM of the UE;
• and
• initiating, by the AP of the UE, an evolved packet data gateway (ePDG) at a communication processor (CP) of the UE based on the cross SIM calling being established;
• receiving, by the CP, cross SIM data packets through the ePDG of the CP;
• and
• processing, by the CP of the UE, the cross SIM data packets.