Patent ID: 8570937

Claim:
A telecommunications system operable to provide a mobile communications session to a mobile node using an internet protocol, comprising a home packet data network operable to communicate internet packets to and from the mobile node to provide the communications session, when the mobile node is affiliated with the home packet data network, the home packet data network including a home agent of the mobile node, and a visited packet data network operable to communicate internet packets to and from the mobile node to provide the communications session, when the mobile node is affiliated with the visited packet data network, wherein one of the home packet data network or the visited packet data network includes a packet data gateway for controlling the communication of the internet packets to and from the home packet data network from and to the visited packet data network, and the mobile node is operable to communicate a correspondent node binding update internet packet to the correspondent node via the packet data gateway, when the mobile node changes affiliation from the home packet data network to the visited packet data network, the correspondent node binding update internet packet providing a care of address of the mobile node within the visited packet data network, a home address of the mobile node, and the packet data gateway is operable to store the home address of the mobile node in association with the care of address of the mobile node, to adapt the correspondent node binding update internet packet by replacing the care of address in the received correspondent binding update packet with the address of the packet data gateway, and to communicate the adapted correspondent binding update packet to the correspondent node, wherein the correspondent node is operable to communicate internet packets to the mobile node, at the care-of-address, in the visited packet data network, via the packet data gateway, without passing through the home agent, the internet packets communicated from the correspondent node to the mobile node including the address of the packet data gateway as the destination address, the address of the correspondent node as the source address, and the home address of the mobile node as part of an extension header, and the packet data gateway is operable to receive the internet packet from the correspondent node, to retrieve the care of address of the mobile node using the home address of the mobile node provided in the extension header field, the care of address of the mobile node having been stored by the packet data gateway in association with the home address of the mobile node, to adapt the internet packet by replacing the destination address of the packet data gateway with the care of address of the mobile node as the destination address, and to communicate the adapted internet packet to the mobile node at the care of address in the visited network.