Multiplex communications – Wide area network – Packet switching
Patent
1992-04-13
1994-01-25
Chin, Wellington
Multiplex communications
Wide area network
Packet switching
455 541, 455 542, 370 951, H04G 702, H04J 326, H04B 726
Patent
active
052822044
ABSTRACT:
A data communications system is overlaid on a voice-based trunked radio system. Digital data packets are transmitted over available radio channels, thereby enabling data communication between a host dispatch system and mobiles and a base station in the trunked radio system. Radio channels associated with trunked channel groups are accessed when available by a communications controller. The communications controller is configured to communicate with various mobile units of the trunked radio system over available radio channels through multiple radio communication links. Radio channels are monitored to detect when the radio channels are presently unused for voice transmission and thereby accessible for data overlay. In particular, when the data overlay system detects that the transmission of analog voice information ceases over a particular radio channel, the trunked channel group association of that particular radio channel is caused to be switched from a voice group to a data group. Data packets are then transferred over the available radio channel.
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Grindahl Merv L.
Shpancer Isaac
Silverman Jon M.
Chin Wellington
Fernandez Dennis S.
RACOTEK, Inc.
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