Patent ID: 7675917

Claim:
A method for accessing a packet data service by a mobile station having a unique domain name, comprising the steps of: (a) allocating to the mobile station an IP (Internet Protocol) address matched to the unique domain name for the packet data service; (b) storing the unique domain name and the allocated IP address in a domain naming system (DNS) server; (c) monitoring, by a home agent, a time set to a valid time for the mobile station; (d) providing the packet data service to the mobile station using the allocated IP address; and (e) deleting the unique domain name and the IP address from the DNS server, when the packet data service of the mobile station is ended; wherein step (b) further comprises the steps of: receiving an accounting start request message including the allocated IP address from an AAA (Authentication, Authorization and Accounting) server; transmitting a DNS update request message including the allocated IP address and the unique domain name of the mobile station to the DNS server; and receiving a DNS update response message corresponding to the DNS update request message from the DNS server.