US5697052A — Cellular specialized mobile radio system

Claim 1

Independent Claim 136 words

A frequency agile repeater for specialized mobile radio service, said repeater comprising: receiver for receiving a transmission at a first frequency; transmitter for re-sending said transmission at a second frequency; a frequency control circuit for producing a predetermined frequency, said frequency control circuit including a plurality of parallel input data lines and producing an output frequency corresponding to digital data on said input data lines; and a microprocessor having a plurality of parallel output data lines, wherein at least some of said parallel output data lines are coupled to the parallel input data lines of said frequency control circuit; said microprocessor including a memory, wherein a table of available frequencies for transmission and reception is stored in said memory and said microprocessor causes said frequency control circuit to select one of said frequencies under software control.

Claim 2

Dependent Claim 136 words

A frequency agile repeater for specialized mobile radio service, said repeater comprising: receiver for receiving a transmission at a first frequency; transmitter for re-sending said transmission at a second frequency; a frequency control circuit for producing a predetermined frequency, said frequency control circuit including a plurality of parallel input data lines and producing an output frequency corresponding to digital data on said input data lines; and a microprocessor having a plurality of parallel output data lines, wherein at least some of said parallel output data lines are coupled to the parallel input data lines of said frequency control circuit; said microprocessor including a memory, wherein a table of available frequencies for transmission and reception is stored in said memory and said microprocessor causes said frequency control circuit to select one of said frequencies under software control.

Claim 3

Dependent Claim 22 words

The repeater as set forth in claim 1 wherein said microprocessor includes a repeater network data link for communicating with other repeaters.

Claim 4

Dependent Claim 36 words

The repeater as set forth in claim 1 wherein said frequency control circuit includes a programmable divider having a plurality of inputs, wherein said input data lines are coupled to the inputs of said programmable divider.

Claim 5

Dependent Claim 46 words

The repeater as set forth in claim 1 wherein said memory includes a table of call signs corresponding to said available frequencies and said microprocessor causes said repeater to automatically identify itself with one of said call signs when the corresponding frequency is selected for transmission.

Claim 6

Dependent Claim 71 words

The repeater as set forth in claim 1 wherein: said input data lines define the available frequencies in a band; said input data lines are divided between a first group and a second group; the input data lines in said first group determine at least one set of frequencies; and the input data lines of said second group select individual frequencies from a set of frequencies selected by said first group.

Claim 7

Dependent Claim 27 words

The repeater as set forth in claim 5 wherein said microprocessor causes said frequency control circuit to scan through frequencies from more than one set of frequencies.

Claim 8

Dependent Claim 17 words

The repeater as set forth in claim 1 wherein said microprocessor is physically located in said repeater.

Claim 9

Dependent Claim 103 words

A specialized mobile radio system for providing both dispatch and cellular radio operations in a predetermined propagation area, said system comprising: an antenna system having an electronically steerable, narrow beam; at least one repeater coupled to said antenna system, said repeater operable in any one of a plurality of frequencies and capable of changing from one frequency to another frequency in a predetermined sequence; a control computer coupled to said repeater and to said antenna for rotating the beam of said antenna and for scanning a plurality of frequencies to provide service in a plurality of cells extending radially from said antenna system.

Claim 10

Dependent Claim 103 words

A specialized mobile radio system for providing both dispatch and cellular radio operations in a predetermined propagation area, said system comprising: an antenna system having an electronically steerable, narrow beam; at least one repeater coupled to said antenna system, said repeater operable in any one of a plurality of frequencies and capable of changing from one frequency to another frequency in a predetermined sequence; a control computer coupled to said repeater and to said antenna for rotating the beam of said antenna and for scanning a plurality of frequencies to provide service in a plurality of cells extending radially from said antenna system.

Claim 11

Dependent Claim 26 words

The system as set forth in claim 8 wherein the beam width of said narrow beam and the angular width of said cells is approximately equal.

Claim 12

Dependent Claim 23 words

The system as set forth in claim 8 wherein said antenna system includes three steerable arrays arranged along the sides of a triangle.

Claim 13

Dependent Claim 13 words

The system as set forth in claim 10 wherein said triangle is equilateral.

Claim 14

Dependent Claim 32 words

The system as set forth in claim 8 wherein said repeater includes a microprocessor, a frequency synthesizer controlled by said microprocessor, and a data link coupling said microprocessor to said control computer.

Claim 15

Dependent Claim 49 words

The system as set forth in claim 12 wherein said repeater includes: a receiver; a level detector coupled to said receiver; and an analog-to-digital converter coupled to said level detector for converting voltages proportional to signal strength into digital data; wherein said analog-to-digital converter is coupled to said microprocessor.

Claim 16

Dependent Claim 28 words

The system as set forth in claim 13 wherein said control computer adjusts the azimuth of said beam in accordance with the signal strength of a received signal.

Claim 17

Dependent Claim 39 words

The system as set forth in claim 8 wherein said repeater includes a frequency synthesizer and a data link coupling said control computer to said frequency synthesizer, wherein the frequency of each repeater is controlled by said control computer.

Claim 18

Dependent Claim 117 words

A specialized mobile radio system for providing both dispatch and cellular radio operations in a predetermined propagation area, said system comprising: an antenna; at least one repeater coupled to said antenna, said repeater operable in any one of a plurality of frequencies and capable of changing from one frequency to another frequency in a predetermined sequence; said repeater including a microprocessor and a frequency synthesizer controlled by said microprocessor; wherein said microprocessor includes a memory containing a table of frequencies and call signs, wherein a call sign is associated with a particular transmission frequency; and wherein said microprocessor causes said repeater to transmit the call sign associated with a particular one of said plurality of transmission frequencies.

Claim 19

Dependent Claim 117 words

A specialized mobile radio system for providing both dispatch and cellular radio operations in a predetermined propagation area, said system comprising: an antenna; at least one repeater coupled to said antenna, said repeater operable in any one of a plurality of frequencies and capable of changing from one frequency to another frequency in a predetermined sequence; said repeater including a microprocessor and a frequency synthesizer controlled by said microprocessor; wherein said microprocessor includes a memory containing a table of frequencies and call signs, wherein a call sign is associated with a particular transmission frequency; and wherein said microprocessor causes said repeater to transmit the call sign associated with a particular one of said plurality of transmission frequencies.

Claim 20

Dependent Claim 116 words

A mobile radio system comprising: at least two repeaters, wherein each of said repeaters includes: a receiver for receiving a transmission at a first frequency; a transmitter for transmitting said transmission at a second frequency displaced a fixed amount from said first frequency; a frequency control circuit; a microprocessor coupled to said frequency control circuit; said microprocessor including memory, wherein a table of available frequencies for transmission and for reception is stored in said memory and said microprocessor causes said frequency control circuit to select one of said frequencies under software control; wherein the microprocessor in one repeater is coupled to the microprocessor in each other repeater for sharing data on frequency allocation among the microprocessors.

Claim 21

Dependent Claim 116 words

A mobile radio system comprising: at least two repeaters, wherein each of said repeaters includes: a receiver for receiving a transmission at a first frequency; a transmitter for transmitting said transmission at a second frequency displaced a fixed amount from said first frequency; a frequency control circuit; a microprocessor coupled to said frequency control circuit; said microprocessor including memory, wherein a table of available frequencies for transmission and for reception is stored in said memory and said microprocessor causes said frequency control circuit to select one of said frequencies under software control; wherein the microprocessor in one repeater is coupled to the microprocessor in each other repeater for sharing data on frequency allocation among the microprocessors.

Claim 22

Dependent Claim 50 words

The system as set forth in claim 17 wherein at least one microprocessor includes a memory containing a table of call signs corresponding to said available frequencies and wherein each repeater automatically identifies itself with the call sign corresponding to the frequency of transmission then in use by the repeater.

Annuity Stage	Window Opens	Payment Deadline	Surcharge Period Until	Estimated Fee	Status
3.5 Years (Year 4)	2000-12-08	2001-06-09	2001-12-09	$2000.00	Window Closed / Lapsed
7.5 Years (Year 8)	2004-12-08	2005-06-09	2005-12-09	$3760.00	Window Closed / Lapsed
11.5 Years (Year 12)	2008-12-08	2009-06-09	2009-12-09	$7700.00	Window Closed / Lapsed

Cellular specialized mobile radio system

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