Method and system for managing mobility of an access terminal in a mobile communication system using mobile ip

A system for managing mobility of an Access Terminal (AT) in a mobile communication system using Mobile Internet Protocol version 4 (IPv4), the system comprising:

• a Home Agent (HA);
• an Access Network (AN);
• an Access Gateway;
• a Signaling Radio Network controller (SRNC);
• an Authentication, Authorization, and Accounting server (AAA) for generating a first key for mutual authentication between the HA and the AT, and generating a second key for mutual authentication between the AG and the HA, during an Access Authentication process in which the AT, the AN, the SRNC, the AG, and the AAA are involved;
• wherein the AG for generates a third key for mutual authentication between the AG and the AT, sends a Care-of-Address (CoA) to be used in a foreign network to the AT, and upon receiving from the AT a Registration Request message including at least one of the CoA, a first Authentication Extension generated with the first key, a third Authentication Extension generated with the third key, a Home-of-Address (HoA) of the AT, and an HA address, verifies the third Authentication Extension included in the Registration Request message using the third key, and sends a second Authentication Extension for mutual authentication between the AG and the HA, and the Registration Request message;
• wherein the HA, upon receiving the Registration Request message via the AG, verifies the first Authentication Extension using the first key acquired from the AAA, verifies the second Authentication Extension using the second key, and allocates an HoA of the AT to the AT;
• and
• wherein the AT generates the first key for mutual authentication between the AT and the HA, generates the third key for mutual authentication between the AT and the AG, receives, from the AG, a CoA that the AT will use in a foreign network, sends, to the AG, a Registration Request message including at least one of the CoA, the first Authentication Extension generated with the first key, a third Authentication Extension generated with the third key, the HoA of the AT, and the HA address, and receives, from the AG, a Registration Response message, in response to the Registration Request message including the HoA allocated to the AT.

A method for managing mobility of an Access Terminal (AT) in a Home Agent (HA) of a mobile communication system using Mobile Internet Protocol version 4 (IPv4), the method comprising:

• receiving, from the AT, a Registration Request message including at least one of a first Authentication Extension that an Access Gateway (AG) that received the Registration Request message has generated using a first key for mutual authentication between the AT and the HA, a second Authentication Extension generated using a second key for mutual authentication between the AG and the HA, a Home-of-Address (HoA) of the AT, an HA address, and a Care-of-Address (CoA) allocated from the AG;
• acquiring the first key and the second key from an Authentication, Authorization, and Accounting server (AAA);
• verifying the first Authentication Extension included in the Registration Request message using the first key acquired from the AAA;
• verifying the second Authentication Extension included in the Registration Request message using the second key;
• registering mobility-related information of the AT after verification of the first Authentication Extension and the second Authentication Extension;
• and
• sending, to the AT, a Registration Response message including at least one of an HoA to be used by the AT and the CoA, in response to the Registration Request message.

A method for managing mobility of an Access Terminal (AT) in a mobile communication system that includes the AT, an Access Gateway (AG) through which the AT accesses a packet data network, and an Authentication, Authorization, and Accounting server (AAA) for authenticating the AT, and uses Mobile Internet Protocol version 4 (IPv4), the method comprising:

• performing an Access Authentication process utilizing the AAA;
• receiving, by the AG, a Registration Request message including relevant information for authentication check and mobility management for the AT, from the AT;
• relaying, by the AG to the HA, the Registration Request message of the AT;
• verifying, by the HA, authentication-related information of the AT;
• registering relevant information for mobility management of the AT;
• and
• sending, by the HA to the AT, via the AG, a Registration Response message indicating the registration of the AT, in response to the Registration Request message.