Multi-SIM user equipment and wireless communication method thereof

1. A wireless communication method for dual SIM dual standby (DSDS) technology, which is applied on Multi-SIM user equipment (UE) which is capable of carrier aggregation (CA) or dual connectivity (DuCo), the wireless communication method comprising:

determining whether a packet switch (PS) or circuit switch (CS) paging is received on a second SIM card when a first PS call is ongoing in a first SIM card;

suspending the first PS call which is ongoing on the first SIM card if the packet switch (PS) or circuit switch (CS) paging is received on the second SIM card; and

initiating a protection timer when the first PS call is suspended; and

resuming the first PS call when the protection timer expires.

2. The wireless communication method of claim 1 , further comprising:

determining whether the PS or CS paging is for a Mobile Terminated (MT) call after suspending the first PS call which is ongoing on the first SIM card; and

resuming the first PS call if the PS or CS paging is not for the call.

3. The wireless communication method of claim 2 , further comprising:

determining whether to only notify a user that there is the MT call if the PS or CS paging is for the MT call.

4. The wireless communication method of claim 3 , further comprising:

establishing the call to obtain a caller number, if a determination is made to only notify the user that there is the MT call;

disconnecting the call when obtaining the caller number;

notify the user that there is the MT call; and

resuming the first PS call after notifying the user that there is the MT call.

5. The wireless communication method of claim 3 , further comprising:

establishing the call and reporting the call to the user directly, if a determination is made not to notify the user that there is the MT call;

picking up, holding or rejecting the call according to a selection result of the user;

terminating the protection timer when the call is picked up; and

disconnecting the first PS call.

6. A Multi-SIM user equipment (UE) which is capable of carrier aggregation (CA) or dual connectivity (DuCo), for dual SIM dual standby (DSDS) technology, the Multi-SIM user equipment comprising:

a processor, configured to determine whether a packet switch (PS) or circuit switch (CS) paging is received on a second SIM card when a first PS call is ongoing in a first SIM card, and suspend the first PS call which is ongoing on the first SIM card if the packet switch (PS) or circuit switch (CS) paging is received on the second SIM card, wherein the processor further initiates a protection timer when the first PS call is suspended and resumes the first PS call when the protection timer expires.

7. The Multi-SIM user equipment of claim 6 , wherein the processor further determines whether the PS or CS paging is for a call after suspending the first PS call which is ongoing on the first SIM card, and wherein the processor further resumes the first PS call if the PS or CS paging is not for the call.

8. The Multi-SIM user equipment of claim 7 , wherein the processor further determines whether to only notify a user that there is the MT call if the PS or CS paging is for the call.

9. The Multi-SIM user equipment of claim 8 , wherein the processor further establishes the call to obtain the caller number, if the processor determines to only notify the user that there is the MT call, and wherein the processor disconnects the call when obtaining the caller number, and notify the user that there is the MT call, and wherein the processor further resumes the first PS call after notifying the user that there is the MT call.

10. The Multi-SIM user equipment of claim 8 , wherein the processor further establishes the call and reports the call to the user directly, if the processor determines not to notify the user that there is the MT call, and the processor picks up, holds, or rejects the call according to a selection result of the user, and wherein the processor further terminates the protection timer when the call is picked up, and disconnect the first PS call.