Patent ID: 7813347

Claim:
A method for combining network controlled mobility and User Equipment (UE) controlled mobility between different IP versions on a network supporting only one IP version, said method comprising: sending, by a first Access Router (AR 1 ) supporting an Internet Protocol Version x (IPVx), a network prefix to a dual stack User Equipment (UE), said UE additionally having an Internet Protocol Version y (IPvy) Home Address (HoA); registering by AR 1 , at a dual stack Home Agent (HA), an IPvx IP address of the UE including the network prefix of the UE for tunneling packets for the UE by the network directly to AR 1 ; receiving by AR 1 , a Dual Stack-Mobile Internet Protocol version 6 (DS_MIPv6) Binding Update (BU) containing the IPvy HoA in the IPvy extensions; detecting movement of the UE by an L2 attachment to a second Access Router (AR 2 ), said AR 2 requesting from the HA the network prefix assigned to the UE; switching, by the HA, the tunneling of packets for the UE from AR 1 to AR 2 ; binding, by the HA the IPvx address of the UE to an IP address of AR 2 and binding the IPvy HoA to the IPvx address of the UE; and tunneling, by the HA, IPvx packets to AR 2 , and tunneling IPvy packets to the IPvx address of the UE.