Patent ID: 7941142

Claim:
A mobile communication system comprising: a mobile station configured to request updating of area information in accordance with a change in receiving-area information; and a base station that includes a transmitting unit configured to broadcast area information to the mobile station and transmit area list information to the mobile station, said area list information including a plurality of pieces of area information including a first position registration area and a second position registration area, wherein, the mobile station includes a receiving unit configured to receive the area information and the area list information, and a signal analyzing unit configured to regulate said request of updating when the changed receiving-area information is included in the second position registration area of the area list information if the receiving-area information changes and start update process of the area information by transmitting information indicative of previous position registration area when the changed receiving-area information is not included in the first position registration area or the second position registration area of the area list information.