Telecommunications – Transmitter and receiver at separate stations
Patent
1993-08-12
1996-01-09
Urban, Edward F.
Telecommunications
Transmitter and receiver at separate stations
455 541, 4551662, H04B 714
Patent
active
054836700
ABSTRACT:
A digitally trunked radio repeater system provides substantial improvements in timeliness of channel acquisition and channel drop, and in reliability of critical control signalling. The system uses a much higher digital signalling rate than is typically found in prior art systems, and uses a control channel to convey digital channel request and assignment messages between the central site and mobile transceivers. The mobile radio transceivers transmit channel requests on the control channel (if no response is received, the mobile retries during a retry time window which increases in duration in dependence on the number of retries). The mobile transceiver switches to a working channel in response to an assignment message received on the control channel. Subaudible digital signals transmitted on the control channel and on active working channels allow late entry, shifting to higher priority calls, and other advanced functions. Message and transmission trunking capabilities are both present so as to maximize working channel usage without compromising channel access for high priority communications. During transmission trunking, called and calling receivers return to the control channel after each transmission (and called transceivers may be inhibited from transmitting) but grant higher priority to calls from the other transceivers being communicated with by temporarily disabling the monitoring of the control channel with respect to the remaining other predetermined call groups to ensure continuity over an entire conversation.
REFERENCES:
patent: 4608712 (1986-08-01), Fedde
patent: 4672601 (1987-06-01), Ablay
patent: 4716407 (1987-12-01), Borras et al.
patent: 4837858 (1989-06-01), Ablay et al.
patent: 5214790 (1993-05-01), Kozcowski et al.
Childress Jeffrey S.
Cooper Gerald M.
Dissosway Marc A.
Hughes, III Houston H.
Ericsson - GE Mobile Communications Inc.
Urban Edward F.
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