Patent ID: 8345628

Claim:
A method for Mobile Internet Protocol (MIP) registering or deregistering, the method comprising: obtaining, by a physical entity in which a destination MIP Foreign Agent (FA) resides, an identity of a mobile terminal (MT ID) and address information of an anchor proxy mobile node or an authenticator; sending, by the physical entity in which the destination MIP FA resides, a message carrying the MT ID to the anchor proxy mobile node or the authenticator; receiving, by the physical entity in which the destination MIP FA resides, a credential corresponding to the MT ID sent from the anchor proxy mobile node or the authenticator after the anchor proxy mobile node or the authenticator receives the message carrying the MT ID and searches for the credential corresponding to the MT ID; and implementing, by the physical entity in which the destination MIP FA resides, MIP registration or deregistration for the mobile terminal using the credential.