| 摘要 |
An arrangement (10) of a mobile station and a method for establishing communication between at least two of such stations are disclosed. The arrangement includes a transmitter (11), a subaudible tone generator (15), a receiver (12), a subaudible tone decoder (16), and a control circuit (14). When in a receive mode, the arrangement (10) causes the receiver (12) to search a carrier signal and a subaudible-tone signal on the plurality of channels. When these signals are found, the transmitter (11) is enabled. When in a transmit mode, the arrangement (10) causes the receiver (12) to search for an idle channel. When an idle channel is found, the arrangement causes the transmitter (11) to transmit a carrier signal and a subaudible tone signal, and waits for a reply from the repeater. Upon receiving the reply, the arrangement (10) enables the transmitter (11).
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