Patent ID: 7756091
Filing Date: 2010-07-13
Classification: H04W

Abstract:
1. The communication method for a mobile network, wherein a gateway GW and a plurality of foreign agents FA (FA 1 to FAn) are provided in a mobile network, and corresponding nodes, on an external network connected to the gateway GW, communicate with mobile nodes, on the mobile network, via the gateway GW and foreign agents FA, the mobile network communication method being characterized in that the gateway GW and the plurality of foreign agents FA are connected in a ring-like manner, with a packet being transferred containing a destination address of a predetermined neighbor foreign agent FA or gateway GW, and said method comprising: a mobile node requesting registration with one of said foreign agents FA; said one foreign agent FA registering address information of the mobile node in a visitor list in response to the registration request; the packet sent from a corresponding node to the mobile node being received by gateway GW; rewriting a source address of the received packet with an address of the gateway GW, rewriting the destination address of the received packet with an address of the predetermined foreign agent FA connected to a link in one direction, and transferring the received packet; after a current foreign agent FA receives the packet from the foreign agent FA connected to the link in the other direction, rewriting the source address of the received packet with an address of the current foreign agent FA, rewriting the destination address of the received packet with an address of the predetermined foreign agent FA connected to the link in said one direction, and transferring the packet, and this being repeated by each foreign agent FA; each foreign agent FA, to which the packet is transferred, searching for the destination address in its own visitor list; and the foreign agent FA, for which the destination address of the received packet is already registered in the visitor list, transferring the received packet to the link connected to the mobile node.