Patent ID: 8155085
Filing Date: 2012-04-10
Classification: H04W

Abstract:
1. A mobile communication method that controls a handover when a mobile node moves from under the control a first access router, which is a movement origin, to under the control of a second router, which is a movement destination, the mobile communication method comprising: receiving, by the second access router, a packet for connection confirmation outputted to the first access router; acquiring, by the second access router that receives the packet for connection confirmation, an address of the first access router from the received packet for connection confirmation, and transmitting a position updating message to the first access router; transmitting, by the first access router receiving the position updating message, prefix information related to a single or a plurality of internet protocol addresses used by the mobile node to the second access router; mapping the prefix information on a tunnel configured between the first access router and the second access router, and transferring a packet destined for the mobile node via the tunnel; transferring the packet transferred via the tunnel between the first access router and the second access router from the second access router to the mobile node; transmitting, after the prefix information related to the single or the plurality of internet protocol addresses used by the mobile node from the first access router is received, from the second access router to the mobile node, a router advertisement message including a prefix of the second access router itself and information indicating that a prefix of the first access router and an internet protocol address generated from the prefix of the first access router are no longer preferred; and generating, by the mobile node, a new internet protocol address based on the prefix of the second access router within the router advertisement message, setting the new internet protocol address to a “preferred” state, and setting the internet protocol address generated from the prefix of the first access router to a “deprecated” state based on the information within the router advertisement message indicating that the internet protocol address generated from the prefix of the first access router is no longer preferred.