Patent ID: 7496068
Filing Date: 2009-02-24
Classification: H04L,H04W

Abstract:
1. A method of enabling a gateway node of a first packet-switched data network to select a first channel for transferring a data packet to a destination packet data protocol address of a correspondent node provided service in the first network, wherein the gateway node is configured to select the first channel from a plurality of channels configured to transfer data packets to the destination packet data protocol address of the correspondent node, wherein the data packet has been sent from a mobile node of a second packet-switched data network external to the first network, wherein the mobile node has been in a communication session with the correspondent node while provided service in a third packet-switched data network different to the second network, the method comprising: a) the mobile node associating, with the data packet, a first packet data protocol address which it used in the communication session with the correspondent node; b) the gateway node selecting the first channel by matching the first packet data protocol address associated with the data packet received by the gateway node to a first data packet filter associated with the first channel; and c) transferring the data packet through the first channel, and, in response to receipt of the data packet, the correspondent node arranging for inclusion of the current packet data protocol address of the mobile node in the second network in the first data packet filter.