MOBILE DATA COMMUNICATION SYSTEM, MOBILE TERMINAL THEREFOR AND DATA COMMUNICATION DEVICE

摘要

PROBLEM TO BE SOLVED: To prevent a party posing as a possessor of a terminal by sending discrimination information to discriminate new connection or re-connection to send a data communication device via a mobile station device, allowing the base station device to receive a connection request signal from a mobile communication device to discriminate the new connection or the re-connection and continuing data communication after that. SOLUTION: A gateway GW receives a connection request signal denoting re-connection from a mobile terminal PS1 and inquires of the mobile terminal connecting to a base station CS1 before the re-connection about confirmation of connection and transfers a connection state confirmation request signal to the base station CS1 before the re-connection via a connection. The base station C1 sends the connection state confirmation request signal to the mobile terminal in existence in a cell of itself via a radio channel. When no reply comes from the terminal, the (not shown) CS1 sends no acknowledgement to the gateway GW after the lapse of a prescribed time to release the connection.