Patent ID: 8150317
Filing Date: 2012-04-03
Classification: H04L,H04W

Abstract:
1. A method for managing mobility of an Access Terminal (AT) in a mobile communication system using Mobile Internet Protocol version 4 (IPv4), the mobile communication system including an AT, an Access Network (AN), a Signaling Radio Network controller (SRNC), an Access Gateway (AG), and an Authentication, Authorization, and Accounting server (AAA), the method comprising: generating, during an Access Authentication process, by the AAA and the AT, a first key for mutual authentication between the AT and a Home Agent (HA); generating, by the AAA and the AG, a second key for mutual authentication between the AG and the HA; generating, by the AG, a third key for mutual authentication between the AG and the AT; acquiring, by the AT, a Care-of-Address (CoA) that the AT will use in a foreign network, from the AG; sending, by the AT to the AG, a Registration Request message including at least one of 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, an address of the HA, and the CoA; verifying, by the AG, the third Authentication Extension included in the Registration Request message received from the AT, using the third authentication key; sending, by the AG to the HA, a Registration Request message including a second Authentication Extension generated with the second key; upon receipt of the Registration Request message from the AG, performing, by the HA, verification on the AT and the AG using the first and the second Authentication Extensions, respectively; allocating an HoA of the AT, when the verification is successfully completed and the HA is assigned to the AT; and sending, by the HA, a Registration Response message including the allocated HoA of the AT, in response to the Registration Request message.