| 摘要 |
PURPOSE:To prevent a mobile station from taking a specific word or a noise for a normal control signal from a base station, by discriminating the regularity of the fixed code of the control signal. CONSTITUTION:On receiving start code 11 in channel swtiching command signal 10 transmitted from the base station, the mobile facility in a call state discriminates whether it is a start code or not. When it is identified as the start signal, the regualrity of the split phase signal of signal-kind discriminative code 12 is discriminated. Then, when it is discriminated that it has the regularity, a channel is disconnected and the mobile facility receives channel assignment code 13 and switches the its own channels according to the assignment channel. When it is discriminated the split phase signal is irregular, on the other hand, it is not regarded as the channel switching command signal and the channel is not changed over, thereby maintaining the channel state. |
