Patent ID: 8005056

Claim:
An Internet protocol (IP) address allocation method using a base station, comprising: transmitting, by a mobile terminal, a signal requesting allocation of an IP address for access to Internet via the base station; receiving, from the base station, information about an identifier of the base station and an IP address range allocated to the base station; searching, by the mobile terminal, a plurality of IP addresses including a specific digit of the base station identifier within the received IP address range; selecting, by the mobile terminal, a first IP address using at least two digits of an Electronic Serial Number (ESN) of the mobile terminal within the searched IP addresses; transmitting, by the mobile terminal, a signal requesting use of the selected first IP address to an IP address server through the base station; re-selecting, by the mobile terminal, a second IP address within the searched IP addresses when an IP address use permission signal associated with the first IP address use request signal from the IP address server is not received through the base station; and re-transmitting, by the mobile terminal, a signal requesting use of the re-selected second IP address to the IP address server through the base station, wherein the searching step includes at least one of: searching the plurality of IP addresses by successively adding a certain numeral to the specific digit of the base station identifier, searching the plurality of IP addresses by taking only specific multiples to the specific digit of the base station identifier, and searching the plurality of IP addresses by a modulo arithmetic or hash function process to the specific digit of the base station identifier.