An adaptive hierarchical mobile IPv6 with route optimization

The IETF mobile IPv6 (MIPv6) enables correspondent nodes (CNs) to directly send packets to a mobile node (MN) using care-of address of the MN. For this service, however, MNs always have to inform CNs and the home agent (HA) of its new location at each movement. To reduce this control signaling, the existing hierarchical scheme built on top of the MIPv6 separates micro-mobility from macro-mobility and exploit an MN´s locality. However, the hierarchical scheme does not achieve real optimization of packet routing. Packets from CN to MN are delivered through an intermediate mobility agent. It brings needless delay on packet delivery and imposes heavy loads on the intermediate mobility agent. In this paper, we propose a new hierarchical scheme that enables any CNs to send packets to an MN without helps of the intermediate mobility agent using a subnet residence time in the profile. This proposal can reduce delay in packet delivery and optimize packet delivery routing. Furthermore, it can alleviate heavy loads on the intermediate mobility agent.