Patent ID: 9148826
Filing Date: 2015-09-29
Classification: H04W

Abstract:
1. A handover method for a mobile node moving between at least two networks each supporting a unique and different IP version as a protocol of the mobile node, comprising the steps of: when the mobile node performs handover from a first access router in a first network currently connecting before handover to a second access router in a second network as a handover target, and when an IP version supported by the second network as the handover target and an IP version supported by the first network before handover are different, a step where the mobile node, not having a home address in the second network as the handover target, transmits a first message to a home agent via the first access router, the first message including an allocation solicitation request for assignment of a home address in the second network as the handover target, and transmits a second message to the home agent via the second access router, the second message being separate from the first message and including an address acquisition request for the home address in the second network as the handover target already allocated to the mobile node, in response to the allocation solicitation request, via the first network before the handover; and a step where the home agent transmits via the first access router a third message to the mobile node based on the allocation solicitation request for assignment of a home address included in the first message, the third message including the allocated home address in the second network as the handover target, and transmits via the second access router a fourth message to the mobile node based on the address acquisition request, the fourth message including the allocated home address in the second network as the handover target.