| 摘要 |
PURPOSE:To exactly attain an operation restoration by including specific control information in a calling signal to the receiver of a charge unpaid user, and setting cipher key information necessary for the restoration in the inside of the receiver at the time of setting the operation limitation of the receiver. CONSTITUTION:At the time of limiting a receiver operation to the receiver owned by the service charge unpaid user, the selected specific control information is included in the radio calling signal, and transmitted, and the operation of the receiver is apparently stopped. At this time, in the radio calling receiver, the designated operation limitation is operated, a random number corresponding to the specific control signal one to one is generated by a random number generating part 4, the random number and the received information are computed by an arithmetic part 3, and the obtained cipher key information is stored in a storage part 8. Afterwards, at the time of newly receiving a calling including the specific control information, the cipher key information included in the received signal is compared with the cipher key information of the storage part 8, and when matching is detected, the control instructed by the specific control information is executed, the operation limitation is released, and a normal state is restored.
|
