Coordinated packet data network change for selected internet protocol traffic offload

1. A method implemented by a wireless transmit/receive unit (WTRU), the method comprising:

determining, by the WTRU, preference information associated with an application of the WTRU, the preference information indicating a preferred continuity type;

sending, by the WTRU, a first message including the determined preference information;

communicating, by the WTRU, data associated with a flow via a first anchor point using a first session associated with a first IP address, the flow being associated with the application of the WTRU;

receiving, by the WTRU, a second message triggering an establishment of a second session and indicating the preferred continuity type indicated in the sent preference information is confirmed as a continuity type associated with the application;

establishing, by the WTRU, the second session associated with the second anchor point;

determining whether moving of the flow to the second session is prior to or after a deactivation of the first session based on the confirmed continuity type;

and

on condition that the confirmed continuity type is a continuity of a first type, deactivating the first session after the moving of the flow to the second session.

2. The method of claim 1 , wherein, on condition that the confirmed continuity type is a continuity of a second type, deactivating the first session prior to the moving of the flow to the second session.

3. The method of claim 1 , wherein, for the continuity of the first type, the preference information indicates, for the flow associated with the application, that the deactivation of the first session associated with the first anchor point is after the establishment of the second session associated with the second anchor point.

4. The method of claim 1 , wherein, for the continuity of the second type, the preference information indicates, for the flow associated with the application, that the deactivation of the first session associated with the first anchor point is before the establishment of the second session associated with the second anchor point.

5. The method of claim 1 , wherein the first anchor point corresponds to a first gateway and the second anchor point corresponds to a second, different gateway.

6. The method of claim 1 , further comprising

receiving, by the WTRU, information indicating one or more policies associated with the application of the WTRU,

wherein the determining of preference information is based on the one or more indicated policies.

7. The method of claim 1 , wherein the first message is a non-access stratum message and the preference information is an information element (IE) of the non-access stratum (NAS) message.

8. The method of claim 1 , wherein the deactivating of the first session includes requesting, by the WTRU, the deactivation of the first session.

9. The method of claim 1 , wherein the deactivating of the first session includes determining, by the WTRU, that no information has been received via the first session for a given period of time.

10. A wireless transmit/receive unit (WTRU), comprising:

a processor configured to determine preference information associated with an application of the WTRU, the preference information indicating a preferred continuity type; and

a transmitter/receiver configured to:

send a first message including the determined preference information;

communicate data associated with a flow via a first anchor point using a first session associated with a first IP address, the flow being associated with the application of the WTRU and

receive a second message to trigger an establishment of a second session and to indicate that the preferred continuity type indicated in the sent preference information is confirmed as the continuity type associated with the application,

wherein the processor is configured to:

establish the second session associated with a second anchor point,

determine whether a movement of the flow to the second session is prior to or after a deactivation of the first session based on the confirmed continuity type,

move the flow from the first session associated with the first IP address to the second session associated with a second IP address, and

on condition that the confirmed continuity type is a continuity of a first type, after the flow is moved to the second session, deactivate the first session.

11. The WTRU of claim 10 , wherein, for the continuity of the first type, the preference information indicates, for the flow associated with the application, that the deactivation of the first session associated with the first anchor point is after the establishment of the second session associated with the second anchor point.

12. The WTRU of claim 10 , wherein

the processor is configured to deactivate the first session prior to the flow being moved to the second session, on condition that the confirmed continuity type is a continuity of a second type, and

for the continuity of the second type, the preference information indicates, for the flow associated with the application, that the deactivation of the first session associated with the first anchor point is before the establishment of the second session associated with the second anchor point.

13. The WTRU of claim 10 , wherein the first anchor point corresponds to a first gateway and the second anchor point corresponds to a second, different gateway.

14. The WTRU of claim 10 , wherein the first message is a non-access stratum (NAS) message and the preference information includes an information element (IE) of the non-access stratum (NAS) message.

15. The WTRU of claim 10 , wherein:

the transmitter/receiver is configured to receive information indicating one or more policies associated with the application of the WTRU; and

the processor is configured to determine the preference information, based on the one or more indicated policies.

16. The WTRU of claim 10 , wherein the processor is configured to:

determine that no information has been received via the first session for a given period of time; and

request the deactivation of the first session.

17. A wireless transmit/receive unit (WTRU), comprising:

a processor configured to determine preference information associated with an application of the WTRU, the preference information indicating a continuity type, in which after a flow is moved from a first session to a second session, the first session is deactivated; and

a transmitter/receiver configured to:

send a first message including the determined preference information;

communicate data associated with the flow via a first anchor point using the first session associated with a first IP address, the flow being associated with the application of the WTRU; and

receive a second message to trigger an establishment of the second session and to indicate confirmation of the continuity type to be used for the application, wherein the processor is configured to:

establish the second session associated with a second anchor point, move the flow from the first session associated with the first IP address to the second session associated with a second IP address, and

after the flow is moved to the second session, communicate data associated with the flow via the second anchor point using the second session associated with the second IP address and deactivate the first session in accordance with the conformation.

18. The WTRU of claim 17 , wherein the preference information indicates, for the flow associated with the application, that a deactivation of the first session associated with the first anchor point is after the establishment of the second session associated with the second anchor point.

19. The WTRU of claim 17 , wherein the first message is a non-access stratum (NAS) message and the preference information includes an information element (IE) of the non-access stratum (NAS) message.

20. The WTRU of claim 17 , wherein:

the transmitter/receiver is configured to receive information indicating one or more policies associated with the application of the WTRU; and

the processor is configured to determine the preference information, based on the one or more indicated policies.