Patent ID: 7603477

Claim:
A system for establishing a local mobility agent (LMA), comprising: a router including: a hop-count establishment unit for receiving and storing a hop-count; a local mobility domain (LMD) list generation unit for establishing routers, which are within the stored hop-count from a present router that a mobile node (MN) first attaches to outside of a home network of the MN or first attaches to after the MN moves, as an LMD and generating and storing a list of the routers within the LMD; an address management unit for receiving and storing a new regional care-of-address (RCOA) and a local care-of-address (LCOA) from the MN when the present router is established as the LMA, and each MN including: an LMA control unit for deciding whether to establish the present router to which the MN has an access as the LMA and for receiving and storing the list of the routers within the LMD of the present router established as the LMA; an address register unit for registering the RCOA and the LCOA to a home agent (HA) and the LMA, respectively; and an LMA service time adjustment unit for establishing the present router to which the MN has an access as a new LMA when a binding lifetime has passed and a number of binding update messages (BUMs) exceeds a predetermined value.