Patent ID: 8761119
Filing Date: 2014-06-24
Classification: H04L,H04W

Abstract:
1. A handover method for a mobile node that moves between at least two networks each supporting a different, unique IP version that is a communication protocol of the mobile node in which, when the mobile node performs a handover from an access router before the handover to which the mobile node is currently connected, to an access router of another network of a handover destination, when a judgment is made that the IP version supported by the network of the handover destination and the IP version supported by the network before the handover differ based on a first address allocated from the network of the handover destination to the mobile node, the handover method comprising the steps of: transmitting, by the mobile node, a message including a home address allocation request in the network of the handover destination and the allocated first address, to a home agent via the access router before the handover; performing, by the home agent, a predetermined process based on the message, and transmitting, by the home agent via the access router before the handover, a response message including a home address in response to the allocation request to the mobile node; and judging, by the mobile node, whether the home address included in the response message is the same as the first address; and deciding, by the mobile node, (i) non-execution of the home link judgment, when the mobile node judges that the home address is the same as the first address and (ii) execution of the home link judgment when the mobile node judges that the home address is not the same as the first address.