Telecommunications – Carrier wave repeater or relay system – Monitoring
Patent
1990-01-03
1992-06-23
Eisenzopf, Reinhard J.
Telecommunications
Carrier wave repeater or relay system
Monitoring
455 331, 455 541, 3701051, H04B 160
Patent
active
051251027
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 assignement 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 communciations. During transmission trunking, called and calling transceivers 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 communciated with to ensure continuity over an entire conversation. Additional functions and fault tolerant features further increase the versatility and reliability of the system.
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Childress Jeffrey S.
Cooper Gerald M.
Dissosway Marc A.
Hughes, III Houston H.
Eisenzopf Reinhard J.
Ericsson - GE Mobile Communications Inc.
Urban Edward
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