Patent ID: 8270968

Claim:
A method for communication between a first mobile node and a second mobile node in a communication network implementing Mobile Internet Protocol version 4, the method comprising: assigning, by a first foreign agent of the communication network, a first Care of Address (CoA) to the first mobile node; establishing, by the communication network, a communication link between the first mobile node and the second mobile node via the first foreign agent and a home agent of the first mobile node; detecting, by the communication network, at least one Real-Time Protocol (RTP)/User Datagram Protocol (UDP) data flow from the second mobile node to the first mobile node; installing, by the communication network, a binding for the at least one RTP/UDP data flow, the binding comprising a destination address for the at least one RTP/UDP data flow, wherein the destination address is the address of the home agent of the first mobile node; replacing, by the communication network, the destination address of each binding with the first CoA assigned to the first mobile node; forwarding, by the communication network during a first time period, the at least one RTP/UDP data flow from the second mobile node to the first mobile node independent of the home agent of the first mobile node; replacing, by the communication network, the destination address of each binding with the address of the home agent of the first mobile node, when the second mobile node hand-offs to a second foreign agent; forwarding, by the communication network during a second time period, the at least one RTP/UDP data flow from the second mobile node through the home agent of the first mobile node, when the second mobile node hand-offs to the second foreign agent; assigning, by the second foreign agent, a second CoA to the first mobile node, when the second mobile node hand-offs to the second foreign agent; replacing, by the communication network, the destination address of each binding with the second CoA assigned to the first mobile node, when the second mobile node hand-offs to the second foreign agent; forwarding, by the communication network during a third time period, the at least one RTP/UDP data flow from the second mobile node independent of the home agent of the first mobile node, when the second mobile node hand-offs to the second foreign agent; wherein the second time period is subsequent to the first time period and the third time period is subsequent to the second time period.