A mobile communication method according to the present invention includes a step of causing a mobile station 300 standing by in a cell under a control of a radio base station 202 to send an exchange station 500 identification information of the mobile station and specific identification information, a step of, upon receipt of the specific identification information, causing the exchange station 500 to send a service control station 600 the received identification information of the mobile station 300 and identification information of a second radio base station, a step of causing the service control station 600 to determine whether or not the mobile station 300 has access authorization to the radio base station 200 based on the received identification information of the mobile station and the received identification information of the second radio base station, and a step of, when it is determined that the mobile station 300 has access authorization to the second radio base station, causing the exchange station 500 to instruct the second radio base station to change a radio communication parameter used by the second radio base station.