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A system and methods are shown for selecting a packet data serving node (PDSN) for a mobile node in a mobile Internet Protocol network. One method includes responsively to receiving on a first foreign agent control node (FACN) from a radio node a registration request message and determining that a m

A system and methods are shown for selecting a packet data serving node (PDSN) for a mobile node in a mobile Internet Protocol network. One method includes responsively to receiving on a first foreign agent control node (FACN) from a radio node a registration request message and determining that a mobile profile associated with a mobile node specified in the registration request is not available at the first FACN, sending from the first FACN to a second FACN a query request message including a request for the mobile profile. If the second FACN includes the requested mobile profile, the second FACN sends it to the first FACN using a query response message. When the first FACN receives the query response message, the first FACN makes a determination that the mobile profile includes a network address of the last serving PDSN. Responsively, the first FACN sends to the radio node a registration response message including the network address of the PDSN specified in the mobile profile, and the mobile node registers with the PDSN. Alternatively, if the second FACN does not have the requested mobile profile, the first FACN may select a PDSN using a set of PDSN selection rules available at the first FACN.

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1. A method for selecting a packet data serving node for a mobile node in a mobile Internet Protocol network, the method comprising:receiving on a first foreign agent control node a registration request message from a radio network node, wherein the registration request message is associated with a

1. A method for selecting a packet data serving node for a mobile node in a mobile Internet Protocol network, the method comprising:receiving on a first foreign agent control node a registration request message from a radio network node, wherein the registration request message is associated with a mobile node; making a determination that a mobile profile associated with the mobile node is not available on the first foreign agent control node; generating a query request message at the first foreign agent control node, wherein the query request message comprises a request for the mobile profile associated with the mobile node; sending the query request message from the first foreign agent control node to a second foreign agent control node; receiving a query response message on the first foreign agent control node from the second foreign agent control node; making a determination that the query response message comprises the mobile profile including a network address of a packet data serving node associated with the mobile node; and sending from the first foreign agent control node to the radio network node a registration response message comprising the network address of the packet data serving node specified in the mobile profile. 2. The method of claim 1, further comprising a computer readable medium having stored therein instructions for causing a processor to execute the method of claim 1.3. The method of claim 1, further comprising:receiving the query request message at the second foreign agent control node; making a determination that the mobile profile associated with the mobile node is available at the second foreign agent control node; generating the query response message comprising the mobile profile associated with the mobile node; and sending the query response message from the second foreign agent control node to the first foreign agent control node. 4. The method of claim 3, further comprising:making a determination that the mobile profile is not available at the second foreign agent control node; generating a query response message comprising an indicator that the mobile profile is not available at the second foreign agent control node; and sending from the second foreign agent control node to the first foreign agent control node the query response message comprising the indicator that the mobile profile is not available at the second foreign agent control node. 5. The method of claim 4, further comprising:receiving on the first foreign agent control node the query message comprising the indicator that the mobile profile is not available; making a determination that the query response message does not include the mobile profile; and using at least one selection rule available at the first foreign agent control node to select a packet data serving node to service the registration request associated with the mobile node. 6. The method of claim 1, further comprising:storing the mobile profile received in the query response message on the first foreign agent control node. 7. The method of claim 1, further comprising:receiving the registration response message from the first foreign agent control node on the radio network node; sending a registration request message to the network address of the packet data serving node specified in the registration response message. 8. The method of claim 7, further comprising:receiving the registration request message on the packet data serving node; processing the registration request on the packet data serving node; sending a registration response message from the packet data serving node to the radio network node; and sending a registration update message from the packet data serving node to the first foreign agent control node and the second foreign agent control node, wherein, responsively to receiving the registration update message, the first foreign agent control node and the second foreign agent control node update the mobile profile associated with the mobile node. 9. The method of claim 1, wherein the first foreign agent control node and the second foreign agent control node are configured with shared secrets for encrypting and decrypting messages being sent between the first foreign agent control node and the second foreign agent control node, wherein the method further comprises:at the first foreign agent control node, encrypting the query request message before sending the query request message to the second foreign agent control node; and at the second foreign agent control node, encrypting the query response message before sending the query response message to the first foreign agent control node. 10. A method for selecting a packet data serving node in a mobile Internet Protocol network, the method comprising:receiving from a first foreign agent control node on a second foreign agent control node a query request message comprising a request for a mobile profile associated with a mobile node; making a determination that the mobile profile associated with the mobile node is available on the second foreign agent control node; generating on the second foreign agent control node a query response message comprising the mobile profile associated with the mobile node; sending the query response message from the second foreign agent control node to the first foreign agent control node; receiving the query response message on the first foreign agent control node from the second foreign agent control node; making a determination that the mobile profile comprises a network address of a packet data serving node associated with the mobile node; and sending a registration response message from the first foreign agent control node to a radio network node, the registration response message comprising the network address of the packet data serving node. 11. The method of claim 10, further comprising providing a computer readable medium having stored therein instructions for causing a processor to execute the method of claim 10.12. The method of claim 10, further comprising:receiving the registration response message on the radio network node from the first foreign agent control node, wherein the registration response message comprises the network address of the packet data serving node; sending a registration request message to the packet data serving node; receiving the registration request message on the packet data serving node; processing the registration request message on the packet data serving node; sending a registration response message from the packet data serving node to the radio network node; and sending a registration update message from the packet data serving node to the first control node and the second foreign agent control node, wherein the first foreign agent control node and the second foreign agent control node update the mobile profile associated with the mobile node based on the registration update message. 13. The method of claim 10, further comprising:making a determination that the mobile profile is not available at the second foreign agent control node; generating a query response message comprising an indicator that the mobile profile is not available on the second foreign agent control node; and sending the query response message from the second foreign agent control node to the first foreign agent control node. 14. The method of claim 10, wherein the first foreign agent control node and the second foreign agent control node are configured with shared secrets for encrypting and decrypting messages being sent between the first foreign agent control node and the second foreign agent control node, wherein the query request message comprises an encrypted query request message, and the query response message comprises an encrypted query response message.15. A method for selecting a packet data serving node in a mobile Internet Protocol network, the method comprising:receiving on a first foreign agent control node a registration request message from a radio network node, wherein the registration request message is associated with a mobile node; making a determination that a mobile profile associated with the mobile node is not available on the first foreign agent control node; sending a query request message from the first foreign agent control node to the second foreign agent control node, wherein the query request message comprises a request for the mobile profile associated with the mobile node; receiving the query request message at the second foreign agent control node; making a determination that the mobile profile is available on the second foreign agent control node; sending a query response message from the second foreign agent control node to the first foreign agent control node, wherein the query response message comprises the mobile profile associated with the mobile node; receiving the query response message on the first foreign agent control node; making a determination that the mobile profile comprises a network address of a packet data serving node associated with the mobile node; and sending a registration response message from the first foreign agent control node to the radio network node, wherein the registration response message comprises the network address of the packet data serving node. 16. The method of claim 15, further comprising:receiving on the packet data serving node a registration request message associated with the mobile node; and upon completion of a registration process, sending a registration update message from the packet data serving node to the first foreign agent control node and the second foreign agent control node. 17. The method of claim 16, further comprising:receiving the registration update message on the first foreign agent control node and the second foreign agent control node; and updating the mobile profile associated with the mobile node on the first foreign agent control node and the second foreign agent control node. 18. A system for foreign agent control node redundancy in a mobile Internet Protocol network, the system comprising:a first foreign agent control node and a second foreign agent control node, wherein the first foreign agent control node and the second foreign agent control node are configured to control assignment of mobile nodes to one of a plurality of packet data serving nodes on a foreign network; a query request message for use at the first and second foreign agent control nodes, wherein the first foreign agent control node is configured to send to the second foreign agent control node the query request message to request from the second foreign agent control node a mobile profile of a mobile node; and a query response message for use at the first and second foreign agent control nodes, wherein the second foreign agent control node uses the query response message to send the mobile profile of the mobile node to the first foreign agent control node responsively to receiving the query request message from the first foreign agent control node, wherein the first foreign agent control node is configured to receive the query response message and make a determination that the query response message comprises the mobile profile including a network address of a packet data serving node associated with the mobile node, and responsively, send a registration response message to a radio network node, wherein the registration response message comprises the network address of the packet data serving node. 19. The system of claim 18, wherein the query request message and the query response message are Mobile Internet Protocol messages.20. The system of claim 18, wherein the first foreign agent control node is configured to use the query request message responsively to receiving a registration request message associated with the mobile node from a radio network node, and further responsively to determining that the mobile profile associated with the mobile node is not available at the first foreign agent control node.21. The system of claim 18, wherein the second foreign agent control node is configured to receive the query request message, and, responsively, make a determination that the mobile profile associated with the mobile node is available at the second foreign agent control node, and, if the mobile profile is available on the second foreign agent control node, the second foreign agent control node is configured to send the mobile profile in the query response message to the first foreign agent control node.22. The system of claim 21, wherein, if the second foreign agent control node makes a determination that the mobile profile associated with the mobile node is not available, the second foreign agent control node is configured to send in the query response message an indicator that the mobile profile is not available on the second foreign agent control node.23. The system of claim 18, wherein the first foreign agent control node and the second foreign agent control node are configured with secret keys for encrypting the query request message and the query response message before sending the messages.24. A system for foreign agent control node redundancy in a mobile Internet Protocol network, the system comprising:a first foreign agent control node; a second foreign agent control node; and an interface for use on the first foreign agent control node and the second foreign agent control node, wherein the first foreign agent control node is configured to use the interface to request from the second foreign agent control node a mobile profile of a mobile node, and responsively to receive the mobile profile from the second foreign agent control node, wherein the first foreign agent control node: determines that the mobile profile comprises a network address of a packet data serving node associated with the mobile node; and sends a registration response message to a radio network node, the registration response message comprising the network address of the packet data serving node. 25. The system of claim 24, wherein the first foreign agent control node is configured to request the mobile profile of the mobile node responsively to receiving a registration request associated with the mobile node and determining that the mobile profile is not available on the first foreign agent control node.26. The system of claim 24, wherein the first foreign agent control node is configured to receive the mobile profile in a query response message sent via the interface from the second foreign agent control node.