Method and apparatus for transferring a communication session
View Patent ↗Session Inter-Device (SID) mobility networks ( 50, 100, 150 ) are described in which a seamless transfer of a communication session from a first device ( 56,106, 116 ) to a second device ( 66, 116, 166 ) can be achieved without interrupting the active session. According to the SID mobility network ( 50 ), the transfer can be accomplished by transferring away from the Transferring Node or first device ( 56 ) the IP address associated with the active session ( 58 ) so that the network ( 50 ) will route the session to the desired Target Node or second device ( 66 ). The Transferring Node ( 56 ) transfers its IP address ( 58 ) to the Agent ( 60 ) and stops requesting data packets addressed to its IP address ( 58 ). The Agent ( 60 ) then begins to request and eventually receive the packets addressed to the Transferring Node's IP address ( 58 ). The Agent ( 60 ) then transfers the packets to the Target Node ( 66 ). In an alternate SID mobility network ( 100 ), the Transferring Node ( 106 ) transfers a session specific IP address ( 114 ) to the Agent ( 110 ). The Agent ( 110 ) then transfers packets sent to the session specific IP address ( 114 ) to the Target Node ( 120 ). In another SID mobility network ( 150 ), the Transferring Node ( 162 ) obtains a temporary IP address ( 170 ) and transfers its IP address ( 164 ) to a Session Agent ( 166 ). The Session Agent ( 166 ) begins to request and eventually receive the packets addressed to the Transferring Node's IP address ( 164 ), and for each received packet determines if it belongs to the session the Transferring Node ( 162 ) requested to transfer to the Target Node ( 176 ). If it does, the Session Agent ( 166 ) will transfer the packet to the Target Node ( 176 ) at the Target Node's IP address ( 178 ). If it does not, the Session Agent ( 166 ) will transfer the packet to the Transferring Node ( 162 ) at its temporary IP address ( 170 ). In each SID mobility network, the session with respect to the Correspondent Node continues without interruption throughout the transfer, thereby providing a seamless transfer of the session from a first device to a second device.
1. A method of seamlessly transferring an ongoing communication session between a first device and a correspondent device on an IP network from the first device to a second device, the method comprising:
initiating a communication session between the correspondent device and the first device having a first device IP address, and being configured to allow a user to receive or send the communication session therefrom, whereby the correspondent device is configured to communicate with the first device during the communication session;
negotiating to transfer the communication session from the first device to a second device, the second, device being configured to allow a user to receive or send the communication session therefrom; and
transferring the first device IP address away from the first device to the second device so that data transferred from the correspondent device to the first device via the address thereof will be received by the second device,
wherein the transferring of the first device IP address comprises: transferring the first device IP address from the first device to a Session Agent so that data transferred from the correspondent device to the first device via the address thereof will be received by the Session Agent and routed to the second device.
2. A method according to claim 1 , wherein negotiating to transfer the session comprises: creating a method for securely transferring the communication session from the first device to the second device.
3. A method according to claim 2 , wherein the created method for securely transferring the communication session comprises: generating a random number to serve as a session key for the secure transfer of the session between the first device and the second device.
4. A method according to claim 3 , wherein the method further comprises: encrypting the session key; transferring the encrypted session key from one of said first device and second device to the other of said first device and second device; and using the session key to securely transfer the communication session between the first device and the second device.
5. A method according to claim 1 , wherein the method further comprises: generating a wake-up message once the communication session is no longer to be transferred causing the first device to resume receiving communication sessions addressed to its IP address.
6. A method according to claim 1 , wherein the transferring of the first device IP address comprises: transferring the first device IP address from the first device to the second device so that data transferred from the correspondent device to the first device via the address thereof will be received by the second device.
7. A method according to claim 5 , wherein the first device and the second device are located on different subnets and the method further comprises:
notifying the Session Agent of the desire to transfer so that the Session Agent can intercept the sessions addressed to the first device IP address;
intercepting the sessions addressed to the first device at the first device IP address via the Session Agent; and
tunneling the session from the first device to the second device once the first device IP address has been transferred to the second device.
8. A method according to claim 7 , wherein the method further comprises: authenticating the notice from the first device to the Session Agent to ensure that the first device is the source of the notice.
9. A method according to claim 7 , wherein the method further comprises: notifying the Session Agent whether the second device is authorized to transfer the session.
10. A method according to claim 7 , wherein the method further comprises:
generating a random number to serve as a session key for the secure transfer of the session between the Session Agent and the second device;
encrypting the session key;
transferring the encrypted session key between the first device and the second device and the first device and the Session Agent; and
using the session key to securely transfer the communication session from the Session Agent to the second device.
11. A method for transferring an ongoing communication session in an IP network from a first node to a second node via use of an IP address without disrupting the communication session, the method comprising:
initiating a communication session between a first node and a Correspondent Node, the first node being configured to allow a user to receive or send the communication session therefrom, whereby the Correspondent Node is configured to communicate with the first node during the communication session;
negotiating a transfer of the communication session between the Correspondent Node and the first node to the Correspondent Node and a second node such that the second node will generally assume the IP address of the first node, the second node being configured to allow a user to receive or send the communication session therefrom;
notifying an Agent about the transfer so that the Agent can intercept communications addressed to the first node and forward the communications to the second node; and
intercepting and forwarding the communications addressed to the first node to the second node such that the communication session with the Correspondent Node continues without interruption,
wherein the step of notifying the Agent comprises: transferring the first device IP address from the first device to the Agent so that data transferred from the correspondent device to the first device via the address thereof will be received by the Agent and routed to the appropriate device.
12. A method of transferring an ongoing communication session between a Transferring Node and a Correspondent Node from the Transferring Node to a Target Node without disrupting the communication session, the method comprising:
initializing a communication session between a Correspondent Node and a Transferring Node, the Transferring Node being configured to allow a user to receive or send the communication session therefrom, whereby the Correspondent Node is configured to communicate with the Transferring Node during the communication session;
negotiating a session transfer between the Transferring Node and a Target Node;
generating a random number to serve as a session key as a result of the negotiating;
encrypting the session key via a security association between the Transferring Node and an Agent;
transmitting the encrypted session key between the Transferring Node and the Target Node, the Target Node being configured to allow a user to receive or send the communication session therefrom;
notifying the Agent that the communication session is being transferred from the Transferring Node to the Target Node;
authenticating the transfer notification by having the Agent verify that the Transferring Node sent the transfer notification;
intercepting the session communications intended for the Transferring Node via the Agent; and
tunneling the session communications intended for the Transferring Node to the Target Node via the Agent.
13. The method of claim 12 , wherein the method comprises:
determining whether the Transferring Node has permission to transfer the communication session; and
disabling the Transferring Node's ability to transfer the communication session if the Transferring Node does not has permission to transfer the session.
14. A system for seamlessly transferring an ongoing communication session on an IP network, the system comprising:
a Correspondent Node for transmitting and receiving packets of data within a communication session;
a Transferring Node having a Transferring Node IP address being capable of participating in the communication session with the Correspondent Node, and being configured to allow a user to receive or send the communication session therefrom;
a Target Node capable of participating in the communication session with the Correspondent Node, and being configured to allow a user to receive or send the communication session therefrom; and
an IP network capable of transferring the communication session between the Correspondent Node and the Transferring Node from the Transferring Node to the Target Node by transferring the Transferring Node IP address from the Transferring Node to the Target Node,
wherein the transferring of the first device IP address comprises: transferring the Transferring Node IP address from the Transferring Node to a Session Agent so that data transferred from the Correspondent Node to the Transferring Node via the address thereof will be received by the Session Agent and routed to the Target Node.
15. A system according to claim 14 , wherein the Session Agent intercepts the communication session directed to the Transferring Node IP address and transfers the communication session to the Target Node located on a foreign subnet.