A mobile terminal apparatus includes a plurality of interfaces, each interface being capable of, when an associated access mechanism thereof is in an active state, obtaining a connection to a network using one of a home-address and a care-of-address. The home-address is assigned to the interface in advance,...http://www.google.com/patents/US7843880?utm_source=gb-gplus-sharePatent US7843880 - Mobile terminal device and hand-off method thereof
