The invention relates to a method for managing the mobility of a mobile node that moves to a different network, but keeps the same
IP address. It is proposed to perform
route optimization by a Proxy MIP agent on behalf of the MN, thereby shortening the data-path while allowing network-based mobility. At session setup with a correspondent node, the PCC
system in the home network derides whether
route optimization is to be performed for the communication session. The PMIPa requests
relevant information for the
route optimization, including the decision for route optimization and the addresses of MN and CN, from the PCC
system in the home network, when the MN attaches to the new network area. Accordingly, route optimization is performed by using the Return Routability Procedure according to MIPv6, thereby applying the MN's
IP address as Home Address, and the PMIPa's address as Care-of Address of the MN.