Wide area coverage radio communication system and method
First Claim
1. In a two-way communication system of the type adapted to relay a message substantially simultaneously between a plurality of fixed location sites having corresponding radio coverage areas, the improvement comprising:
- radio frequency transmission means at each of said sites arranged for transmitting on a respective different plurality of frequencies than the transmission frequencies of any other of said sites;
means coupled to each said radio frequency transmission means for selecting among the pluralities of different frequencies at said sites to provide corresponding channels at each of said sites whereby said message may be relayed between said sites; and
control means for selecting one of said channels and causing at least two of said transmission means to transmit said message substantially simultaneously on respective selected different frequencies.
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Accused Products
Abstract
A wide area coverage radio communication system of the type adapted to relay a message substantially simultaneously from a plurality of fixed location sites to a plurality of portable or mobile units includes a plurality of repeaters at each of the sites. Each of the repeaters is arranged to transmit and receive on a respective different frequency duplex pair or channel. Control means at one of the sites senses channel availability at all of the sites and causes one repeater at each of the sites to transmit the message on its respective different frequency. Access to the system by the portable units is provided on a trunked basis through the control means.
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Citations
26 Claims
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1. In a two-way communication system of the type adapted to relay a message substantially simultaneously between a plurality of fixed location sites having corresponding radio coverage areas, the improvement comprising:
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radio frequency transmission means at each of said sites arranged for transmitting on a respective different plurality of frequencies than the transmission frequencies of any other of said sites; means coupled to each said radio frequency transmission means for selecting among the pluralities of different frequencies at said sites to provide corresponding channels at each of said sites whereby said message may be relayed between said sites; and control means for selecting one of said channels and causing at least two of said transmission means to transmit said message substantially simultaneously on respective selected different frequencies. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A two-way communications system for relaying a received message over a wide coverage area, said system comprising:
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a plurality of fixed sites, each site having a site coverage area comprising part of the wide coverage area, each site having a plurality of transmitters timed to different transmission frequencies, and each site having coupling means to couple each site transmitter to a predetermined group of transmitters, said group having one transmitter situated at each other site and each transmitter within said group tuned to a different transmission frequency; control means for causing one of said transmitter groups to transmit said received message in response to all transmitters being unused within said group; at least two remote receiving means located within said wide coverage area, each said remote receiving means being arranged for receiving on all transmission frequencies; and each said fixed site further including receiver control means for causing each said remote receiving means within a site coverage area to tune to its transmission frequency employed by its corresponding transmitter within said group of message transmitting transmitters. - View Dependent Claims (10, 11, 12)
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13. A method of relaying a message substantially simultaneously between a plurality of fixed location sites, said method comprising the steps of:
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providing each said site with radio frequency transmission means capable of transmitting on a respective different plurality of frequencies than the transmission frequencies of any other of said sites; selecting among the pluralities of frequencies at said sites to provide corresponding channels at each of said respective sites; selecting one corresponding channel from among said corresponding channel to relay said message between said sites; and causing at least two of said transmission means to transmit said message substantially simultaneously on said selected plurality of frequencies. - View Dependent Claims (14, 15, 16, 17, 18, 19)
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20. A two-way radio communications system for a large geographic area in which a plurality of geographically spaced apart fixed sites having separate radio coverage areas are employed to extend radio coverage over the large geographic area and transmit a message within the large geographic area comprising:
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at least two means at each fixed site for transmitting radio frequency (RF) signals, each RF signal at a fixed site having a frequency different from any other at the same fixed site; means for grouping said transmitting means into channels, each channel comprising one said transmitting means from each fixed site and each channel employing dissimilar RF signal frequencies among its group of transmitting means; and means for selecting one of said channels having its group of transmitting means unoccupied, and for routing the message to each fixed site whereby transmission may occur essentially simultaneously from each said transmitting means of said selected channel. - View Dependent Claims (21, 22, 23, 24, 25, 26)
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Specification