Method and apparatus for performing handover of a multi-USIM radio-capable UE over same or different systems

1. A user equipment (UE) for wireless communication, the UE comprising:

one or more non-transitory computer-readable media having computer-executable instructions embodied thereon;

at least one processor coupled to the one or more non-transitory computer-readable media, and configured to execute the computer-executable instructions to:

provide a measurement report to a source base station, the measurement report including measurements of a target base station associated with a first universal subscriber identity module (USIM) of the UE;

receive a handover command through the source base station, the handover command containing information of the target base station, the handover command further containing information of at least one candidate target base station associated with a second USIM of the UE.

2. The UE of claim 1 , wherein the at least one processor is further configured to execute the computer-executable instructions to:

determine whether to initiate at least one of handover, cell reselection, and system update with the at least one candidate target base station for the second USIM of the UE.

3. The UE of claim 1 , wherein the first USIM belongs to a first Public Land Mobile Network (PLMN), and the second USIM belongs to a second PLMN.

4. The UE of claim 1 , wherein the first USIM and the second USIM belong to a same PLMN.

5. The UE of claim 1 , wherein the measurement report further includes an indication of multi-USIM radio capabilities of the UE and measurements on a second radio access technology (RAT) network associated with the second USIM.

6. The UE of claim 1 , wherein:

the handover command is received through first USIM based circuitry;

the handover command triggers a handover indication from the first USIM based circuitry to second USIM based circuitry to inform the second USIM of impending mobility;

the handover indication from the first USIM to the second USIM includes additional information regarding the at least one candidate target base station associated with the second USIM of the UE.

7. A method of a user equipment (UE), the method comprising

providing a measurement report to a source base station, the measurement report including measurements of a target base station associated with a first universal subscriber identity module (USIM) of the UE;

receiving a handover command through the source base station, the handover command containing information of the target base station, the handover command further containing information of at least one candidate target base station associated with a second USIM of the UE.

8. A method for performing handover of a user equipment (UE) from a source base station to a target base station, the method comprising:

providing, by the UE, a measurement report to the source base station, the measurement report including measurements of the target base station;

providing, by the source base station, a handover request message to the target base station;

providing, by the target base station, a handover request acknowledgement message to the source base station, the handover request acknowledgement message having a handover command;

providing, by the source base station, the handover command to the UE;

wherein the handover command contains information of the target base station associated with a first universal subscriber identity module (USIM) of the UE, and information of at least one candidate target base station associated with a second USIM of the UE.