Apparatus and method for overlaying data on trunked radio

Multiplex communications – Wide area network – Packet switching

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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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Bustillo, J., et al., "Datamovil: A Practical Implementation of Tradamo Mobile Data Transmission Protocol", May 1989 IEEE, (pp. 31-37).
Stern, H. P., "An Improved Integrated Voice/Data Mobile Radio System", Dept. of Electrical Engineering, University of Texas at Arlington, May 1900 IEEE, (pp. 311-316).

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