TRUNKED RADIO REPEATER SYSTEM
A digitally trunked radio repeater system providing improvements in timeliness of channel acquisition and channel drop, and in reliability of critical control signalling, uses a high digital signalling rate of 9600 b.p.s. and uses a control channel to convey digital channel request and assignment me...
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Format: | Patent |
Sprache: | eng |
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Zusammenfassung: | A digitally trunked radio repeater system providing improvements in timeliness of channel acquisition and channel drop, and in reliability of critical control signalling, uses a high digital signalling rate of 9600 b.p.s. and uses a control channel to convey digital channel request and assignment messages between the central site 100 and mobile transceivers. The mobile radio transceivers transmit channel requests on the control channel and 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 calling mobile and called mobile(s) switch to a working channel in response to an assignment message received on the control channel. Subsequently, in response to an assignment confirmation signal sent from site 100 on the working channel, the calling mobile sends an acknowledgment signal on the working channel and then site 100 sends an unmute message. 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 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 communicated with to ensure continuity over an entire conversation. |
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