Paging method for WTRU with multiple USIMS

1. A method for use in wireless transmit/receive unit (WTRU) which accesses both a first network and a second network to receive radio frames from each of the first network and the second network, the method comprising:

receiving first information from a first network used to determine a first time of a first paging occasion (PO) and receiving second information from a second network used to determine a second time of a second PO;

determining whether there is a PO collision between the first PO and the second PO, on a condition that there is the PO collision, selecting a network from the first network and the second network, and sending a request to the selected network;

receiving, from the selected network, a WTRU ID corresponding to the request; and

receiving a message during a third PO that was determined using the WTRU ID received from the selected network.

2. The method of claim 1 , wherein the determining of the first PO and the second PO further comprises: calculating the first PO using a first parameter; and calculating the second PO using a second parameter, wherein on condition that the selected network is the first network, the WTRU ID is different from the first parameter; and on condition that the selected network is the second network, the WTRU ID is different from the second parameter.

3. The method of claim 1 , wherein the request comprises an overlapping pattern indication indicating when the first PO and the second PO are overlapping.

4. The method of claim 1 , wherein the selecting a network from the first network and the second network is based on an operator policy or a power optimization preference of the WTRU.

5. A method used in wireless transmit/receive unit (WTRU) which accesses both a first network and a second network to receive paging frames from each of the first network and the second network, the method comprising:

receiving first information from a first network used to determine a first time of a first paging occasion (PO) and receiving second information from a second network used to determine a second time of a second PO;

determining whether there is a first PO collision between the first PO and the second PO, on condition that there is the first PO collision, sending a request to the second network;

receiving, from the second network, a WTRU ID corresponding to the request; and

receiving a message during a third PO that was determined using the WTRU ID received from the second network.

6. The method of claim 5 , wherein determining the first PO and the second PO further comprises:

calculating the first PO using a first parameter; and

calculating the second PO using a second parameter, wherein the WTRU ID is different from the second parameter.

7. The method of claim 5 , wherein the request comprises an overlapping pattern indication indicating when the first PO and the second PO are overlapping.

8. The method of claim 5 , further comprising determining whether there is a second PO collision between the first PO and the third PO.

9. A wireless transmit/receive unit (WTRU) which is configured to access both of a first network and a second network to receive radio frames from each of the first network and the second network, the WTRU comprising:

a transmitter;

a receiver; and

a processor,

wherein the processor is configured to receive first information from a first network used to determine a first time of a first paging occasion (PO) and receive second information from a second network used to determine a second time of a second PO;

wherein the processor is further configured to determine whether there is a PO collision between the first PO and the second PO;

wherein, on a condition that there is the PO collision, the processor is further configured to select a network from the first network and the second network;

wherein the transmitter is configured to send a request to the selected network and receive, from the selected network, a WTRU ID corresponding to the request; and

wherein the receiver is configured to receive a message during a third PO that was determined using the WTRU ID received from the selected network.

10. The WTRU of claim 9 , wherein, in order to obtain the first PO, the processor is further configured to calculate the first PO using a first parameter; and in order to obtain the second PO, the processor is further configured to calculate the second PO using a second parameter, wherein on a condition that the selected network is the first network, the WTRU ID is different from the first parameter; and on a condition that the selected network is the second network, the WTRU ID is different from the second parameter.

11. The WTRU of claim 9 , wherein, the request comprises an overlapping pattern indication indicating when the first PO and the second PO are overlapping.

12. The WTRU of claim 9 , wherein the processor is further configured to select the network based on an operator policy or a power optimization preference of the WTRU.

13. The method of claim 1 , further comprising calculating the third PO based on an additional PO equation.

14. The method of claim 13 , wherein the third PO is calculated by adding an offset to an existing PO.

15. The method of claim 5 , further comprising calculating the third PO based on an additional PO equation.

16. The method of claim 15 , wherein the third PO is calculated by adding an offset to an existing PO.

17. The WTRU of claim 9 , wherein the processor is configured to calculate the third PO based on an additional PO equation.

18. The WTRU of claim 17 , wherein the third PO is calculated by adding an offset to an existing PO.