Patent ID: 8452256

Claim:
A communication system comprising: a base station device that performs wireless communication with a mobile terminal; a gateway device that is connected to the base station device and provides the mobile terminal via the base station device with a connection path to a network, and including a data path unit that selects input data and transmits the data to the mobile terminal, a paging controller unit that manages information of the mobile terminal in a state in which power supply of the mobile terminal is turned off, and an authentication unit that transmits the authentication key issued by the authentication server to the mobile terminal, and includes a second registration table which registers identification information of the data path unit or the paging controller unit finally performed data transmission and reception, wherein either the data path unit or the paging controller unit operates according to the state of the mobile terminal; an authentication server that is connected to the gateway device and issues an authentication key to the mobile terminal via the gateway device and the base station device, and including a first registration table which registers identification information of the authentication unit finally performed data transmission and reception; and a position search server which outputs a request requesting determination of position of the mobile terminal; wherein, the authentication server identifies the authentication unit from the first registration table, and outputs the request to the identified authentication unit, if the authentication server receives the request from the position search server, the authentication unit identifies the data path unit or the paging controller unit from the second registration table, if the authentication unit receives the request from the authentication server, and the position search server obtains position information of the mobile terminal from the identified data path unit or paging controller unit.