Patent ID: 7299044
Filing Date: 2007-11-20
Classification: H04W

Abstract:
1. A method of managing mobility of a mobile terminal on at least one domain network including a plurality of subnets, each subnet having at least one home agent apparatus, comprising: determining a home agent for the mobile terminal to perform location management of the mobile terminal, wherein the mobile terminal has communications with an access point apparatus arranged on one of the plurality of subnets and moves between the plurality of subnets or between the at least one domain network which are different in service form; registering a main home address by the mobile terminal provided from a main home agent apparatus to a server for managing an address of the mobile terminal to have a connection to the at least one domain network; and registering a sub-home address to the main home agent apparatus, as a care of address, for use on an other domain network different in service form, when the mobile terminal moves to the other domain network, wherein the sub-home address is registered as the care of address for use on the other domain network for a specified time period; measuring, by the mobile terminal, a composite time corresponding to the mobile terminal being on the other subnet; responsive to the mobile terminal moving to another subnet of the plurality of subnets for a threshold period, changing the main home agent apparatus to another one of the home agent apparatus; wherein the step of changing the main home agent includes changing the mobile terminal to the other one of the home agent apparatus, corresponding to the other subnet, when the composite time reaches the threshold period.