| 摘要 |
A portable transceiver system (100) has at least one base site (200) capable of communicating with at least one of a plurality of portable transceivers (108). The at least one base site (200) comprises communicators communicating on first and second frequencies (301, 302). The first frequency (301) comprises a plurality of sub-frequencies for communicating from the at least one base site to the plurality of portable transceivers (108), and the second frequency (302) comprises a plurality of time-slots for receiving call initiation signals from the plurality of portable transceivers (108). The at least one base site (100) further comprises a receiver (214) and a detector (218) receiving and detecting, respectively, when the call initiation signal is received from one of the plurality of portable transceivers (108), a channel assignor (220), coupled to the detector (218), allocates a frequency assignment for communicating with an initiating portable transceiver (108) on one of the plurality of sub-frequencies of the first frequency (321), and a transmitter (210) transmitting the frequency assignment to the plurality of portable transceivers (108). Each of the plurality of portable transceivers (108) comprises a portable transmitter transmitting the call initiation signal in one of the plurality of time slots to the at least one base site (200), and a receiver receiving the frequency assignment from the at least one base site (200). The at least one base site (200) uses the time related position of the time-slot as an address to communicate to the initiating portable transceiver (108).
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