Patent ID: 8345598

Claim:
A mobility management method for performing mobility management of a mobile terminal in a mobile communication network, the mobility management method comprising the steps of; notifying, at the mobile terminal, an edge node in a visited network in which the mobile terminal currently resides, of a terminal function indicating whether or not the mobile terminal has a Mobile IP client function; inquiring, at the edge node, a home network of the mobile terminal about which of a Mobile IP procedure and a Proxy Mobile IP procedure is supportable by the home network; instructing, at the edge node, the mobile terminal to perform an operation for the mobility management by using the Mobile IP client function or to perform the operation for the mobility management by using an IP function, on the basis of the inquiry result from the home network; performing, at the mobile terminal, the operation for the mobility management by using either the Mobile IP client function or the IP function, in response to the instruction from the edge node; and performing, at the edge node, the operation for the mobility management by using either the Mobile IP Foreign Agent function or the Proxy Mobile IP client function, depending on the inquiry result from the home network.