| 摘要 |
A subscriber unit automatically selects repeater access mode, if a repeater is available, or talk-around mode, if a repeater is not available (500). The subscriber unit initiates a call by transmitting a call setup request on the outbound channel used by the repeater (510), and by monitoring the outbound channel to detect a response from the repeater (520). If a response is received within a timeout period, the subscriber unit continues the call by transmitting on the inbound channel (530, 540). Otherwise, the subscriber unit continues the call using talk-around mode, by transmitting on the outbound channel (530, 550). In this process, the repeater monitors the outbound channel to determine when a call setup request is transmitted by the subscriber unit (610), and responds accordingly on the outbound channel (620, 630), thereby indicating its availability. The repeater then monitors the inbound channel and retransmits, or repeats, signals received via the inbound channel, on the outbound channel (640, 650, 660).
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