Coordinated packet data network change for selected internet protocol traffic offload
Coordinated P-GW change for SIPTO may be provided. A WTRU may send and/or receive one or more flows via a first PDN connection and via a first P-GW. The WTRU may send an indication to the network that at least one flow of the first PDN connection is available for SIPTO. The indication may include one or more SIPTO preferences. The WTRU may receive a message from a MME. The message may trigger establishment of a second PDN connection via a second P-GW. The WTRU may move, while maintaining the first PDN connection, the at least one flow from the first PDN connection to the second PDN connection. The WTRU may deactivate the first PDN connection when the one or more flows have been moved to the second PDN connection and/or when no information has been received via the first PDN connection after a predetermined duration.
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;
sending, by the WTRU, a first message including the determined preference information that indicates, for a flow associated with the application, that a deactivation of a first session associated with a first anchor point is after an establishment of a second session associated with a second anchor point;
communicating, by the WTRU, data associated with the flow via the first anchor point using the first session associated with a first IP address;
receiving, by the WTRU, a second message triggering the establishment of the second session and a movement of the flow to the second session;
establishing, by the WTRU, the second session associated with the second anchor point;
moving, by the WTRU, the flow from the first session that is associated with the first IP address to the second session that is associated with a second IP address; and
after the moving of the flow to the second session, communicating, by the WTRU, data associated with the flow via the second anchor point using the second session associated with the second IP address.
2. 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.
3. The method of claim 1 , further comprising, after the moving of the flow to the second session, deactivating the first session.
4. The method of claim 1 , wherein the first session is associated with a first packet data network (PDN) connection and the second session is associated with a second PDN connection.
5. The method of claim 1 , wherein the first session corresponds to an IP multimedia subsystem (IMS) session.
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; and
determining, based on the one or more indicated policies, whether to seamlessly move the flow to the second session prior to the deactivation of the first session.
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. A wireless transmit/receive unit (WTRU), comprising:
a processor configured to determine preference information associated with an application of the WTRU; and
a transmitter/receiver configured to:
send a first message including the determined preference information that indicates, for a flow associated with the application, that a deactivation of a first session associated with a first anchor point is after an establishment of a second session associated with a second anchor point,
communicate data associated with the flow via the first anchor point using the first session associated with a first IP address, and
receive a second message to trigger the establishment of the second session and a movement of the flow to the second session,
wherein:
the processor is configured to:
establish the second session associated with the second anchor point,
move the flow from the first session associated with the first IP address to the second session associated with the second IP address, and the transmitter/receiver is configured to:
after the movement of the flow 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.
9. The WTRU of claim 8 , wherein the first anchor point corresponds to a first gateway and the second anchor point corresponds to a second, different gateway.
10. The WTRU of claim 8 , further comprising, after the movement of the flow to the second session, the processor is configured to deactivate the first session.
11. The WTRU of claim 8 , wherein the first session is associated with a first packet data network (PDN) connection and the second session is associated with a second PDN connection.
12. The WTRU of claim 8 , wherein the first session corresponds to an IP multimedia subsystem (IMS) session.
13. The WTRU of claim 8 , wherein the first message is a non-access stratum (NAS) message and the preference information is an information element (IE) of the non-access stratum (NAS) message.
14. The WTRU of claim 8 , 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, based on the one or more indicated policies, whether to seamlessly move the flow to the second session prior to the deactivation of the first session.