Patent ID: 8701178

Claim:
A method for managing mobility of an Access Terminal (AT) using a Proxy Mobile Internet Protocol (PMIP) in a mobile communication system, the method comprising: performing access authentication between the AT and an Authentication, Authorization, and Accounting (AAA) server; sending, by the AT, a Dynamic Host Configuration Protocol (DHCP) Server Discover message including first relevant information for authentication check to an Access Gateway (AG); upon receipt of the DHCP Server Discover message, sending, by the AG, a Proxy Registration Request message including second relevant information for mobility management for the AT to a Home Agent (HA); receiving, by the AG, a Proxy Registration Response message indicating a successful reception of the Proxy Registration Request message, from the HA; upon receipt of the Proxy Registration Response message, sending, by the AG, a DHCP Offer message, which is received by the AG from a DHCP server, including a Home Address (HoA) of a corresponding AT, to the AT; and sending, by the AG, a DHCP Acknowledgement (ACK) message, which is received by the AG from the DHCP server, for accepting use of the HoA, to the AT, when the AT notifies the AG of its intention to use the HoA, wherein sending, by the AT, the Dynamic Host Configuration Protocol (DHCP) Server Discover message comprises sending at least one of key information for mutual authentication between the AT and the AG, key information for mutual authentication between the AT and the HA, and a Network Access Identifier (NAI) of the AT.