Parasitic radio transmission system
First Claim
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1. A communications system for transmitting information signals to a first plurality of receivers upon request, and for transmitting parasitic data to a second plurality of receivers, said communications system comprising:
- a transmitter for transmitting an information signal to at least one of the first plurality of receivers on an assigned frequency selected from among a plurality of available frequencies, in response to a request to transmit received from a user of said communications system; and
said transmitter for transmitting parasitic data to at least one of the second plurality of receivers on a heretofore unoccupied frequency selected from among the plurality of available frequencies, and wherein the parasitic data transmission is interrupted if the selected frequency is required for transmitting an information signal to one of the first plurality of receivers.
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Abstract
A system is disclosed for sending parasitic digital packets over a trunked radio system network during the time that a trunking channel is unoccupied. The parasitic digital packets are received by one or more parasitic receivers, which are not a part of the conventional trunked radio system. To ensure the integrity and reliability of the trunked radio system, the transmission of these parasitic data packets is preempted when the system is required to transmit signals between users of the trunked radio system.
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Citations
22 Claims
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1. A communications system for transmitting information signals to a first plurality of receivers upon request, and for transmitting parasitic data to a second plurality of receivers, said communications system comprising:
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a transmitter for transmitting an information signal to at least one of the first plurality of receivers on an assigned frequency selected from among a plurality of available frequencies, in response to a request to transmit received from a user of said communications system; and
said transmitter for transmitting parasitic data to at least one of the second plurality of receivers on a heretofore unoccupied frequency selected from among the plurality of available frequencies, and wherein the parasitic data transmission is interrupted if the selected frequency is required for transmitting an information signal to one of the first plurality of receivers. - View Dependent Claims (2, 3, 4)
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5. A trunked radio repeater system including a trunked radio repeater and a plurality of portable radios for communicating bi-directionally with each other via said trunked radio repeater, wherein the trunked radio repeater system further includes plural working channels, said trunked radio repeater system further including a plurality of parasitic receivers operating on a secondary basis to the plurality of portable radios, said trunked radio repeater system comprising:
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a first controller for receiving a request from one of the plurality of portable radios to transmit an information signal to at least one other of the plurality of portable radios, and in response thereto for assigning a working channel to carry the information signal; and
a second controller responsive to said first controller for transmitting parasitic data to one or more of the plurality of parasitic receivers on an unoccupied working channel. - View Dependent Claims (6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 20, 21, 22)
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19. A method for operating a trunked radio repeater system having a control channel and plural working channels, wherein the working channels are assigned for use by one or more of a first plurality of radios as specified by a control signal carried on the control channel and assigned for use by a second plurality of radios when not in use by one of the first plurality of radios, said method comprising:
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operating one or more of the first plurality of radios on one of the plural working channels in response to an assignment signal carried on the control channel;
determining when a working channel is unoccupied; and
operating one or more of the second plurality of radios on an unoccupied working channel.
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Specification