US5864762A — Operating a trunked communication system in trans…

Claim 1

Independent Claim 174 words

In a trunked radio repeater system for achieving RF communication between at least a first radio unit and a second radio unit over an RF working channel temporarily assigned to carry communications between said at least first and second radio units, a method of dynamically specifying transmission trunked or message trunked usage on a call-by-call basis for said temporarily assigned working channel, said method comprising the steps of: carrying digitally encoded working channel request and assignment signals associated with a call over a full duplex digital RF control channel; monitoring said control channel at said first and second unit, and switching to a working channel temporarily assigned to said call based on said digitally encoded working channel assignment signals carried over said control channel; and dynamically specifying transmission trunked or message trunked usage for said call by specifying trunked call type in at least one digital information field included within digitally encoded signals associated with said call that are carried over at least one of said control channel or said temporarily assigned working channel.

Claim 2

Dependent Claim 174 words

In a trunked radio repeater system for achieving RF communication between at least a first radio unit and a second radio unit over an RF working channel temporarily assigned to carry communications between said at least first and second radio units, a method of dynamically specifying transmission trunked or message trunked usage on a call-by-call basis for said temporarily assigned working channel, said method comprising the steps of: carrying digitally encoded working channel request and assignment signals associated with a call over a full duplex digital RF control channel; monitoring said control channel at said first and second unit, and switching to a working channel temporarily assigned to said call based on said digitally encoded working channel assignment signals carried over said control channel; and dynamically specifying transmission trunked or message trunked usage for said call by specifying trunked call type in at least one digital information field included within digitally encoded signals associated with said call that are carried over at least one of said control channel or said temporarily assigned working channel.

Claim 3

Dependent Claim 93 words

A method as in claim 1 further comprising the steps of: storing, in one of said first and second radio unit, the identity of the other unit in response to receipt of said channel assignment signals; and in response to a specified call type indicating transmission trunked usage, automatically generating, with said one radio unit, channel request signals including said stored identity of said other radio unit so as to automatically generate channel request signals on the control channel to call back the other radio unit over a further temporarily assigned working channel.

Claim 4

Dependent Claim 33 words

The method as in claim 2, wherein the step of automatically calling back is performed with no channel hang time and includes sending at least some 9600 bps signaling over the control channel.

Claim 5

Dependent Claim 58 words

The method as in claim 2, wherein said first and second units each include push to talk (PTT) switches, and the step of automatically calling back is performed if the push to talk (PTT) switch of the one unit is depressed within a predetermined time after release of the push to talk (PTT) switch of the other unit.

Claim 6

Dependent Claim 96 words

A method as in claim 1 wherein: said dynamically specifying step includes transmitting over the air with at least one radio repeater substantially at 9600 bits per second on at least one of said control channel or said temporarily assigned working channel, a digital transmission/message trunked status signal identifying whether the usage of the temporarily assigned working channel is to be transmission or message trunked; and wherein said method further includes controlling call termination timing with at least one of said first and second radio units based at least in part on said trunked status signal.

Claim 7

Dependent Claim 50 words

A method as in claim 1 wherein said carrying step comprises carrying said digitally encoded working channel request and assignment signals over said digital control channel at a rate of substantially 9600 bps and using a substantial portion of the 9600 bps signalling rate capacity to provide enhanced signalling reliability.

Claim 8

Dependent Claim 23 words

A method as in claim 1 further including carrying voice signals between said first and second units over said temporarily assigned working channel.

Claim 9

Dependent Claim 38 words

A method as in claim 1 further including carrying digital signals substantially at 9600 bps over said temporarily assigned working channel, and using a substantial portion of the 9600 bps signalling rate capacity to provide enhanced signalling reliability.

Claim 10

Dependent Claim 89 words

A method as in claim 1 further including specifying the identity of said first radio unit and the identity of said second radio unit in at least some of said digitally encoded signals, and wherein said dynamically specifying step comprises including, within said digitally encoded signals, at least one digital message/transmission trunking bit that determines, independently of said first radio unit identity and said second radio unit identity, whether said first and second radio units are to engage in a transmission trunked call or in a message trunked call.

Claim 11

Dependent Claim 54 words

A method as in claim 1 wherein said dynamically specifying step comprises including, within digitally encoded signals transmitted over said temporarily assigned working channel, at least one digital message/transmission trunking bit that determines whether said first and second radio units are to engage in a transmission trunked call or in a message trunked call.

Claim 12

Dependent Claim 31 words

A method as in claim 1 further including automatically inhibiting, in a transmission trunked usage, one of said first and second radio units from transmitting on said temporarily assigned working channel.

Claim 13

Dependent Claim 61 words

A method as in claim 1 further including deallocating said temporarily assigned working channel: (a) in a transmission trunked usage, in response to unkeying of said first radio unit, and (b) in a message trunked usage, a predetermined time following unkeying of either said first radio unit or second radio unit, unless the other radio unit keys within said predetermined time.

Claim 14

Dependent Claim 37 words

A method as in claim 1 further including, in a transmission trunked usage, substantially immediately reverting said first and second radio units to said control channel upon unkeying, and freeing said temporarily assigned working channel for reassignment.

Claim 15

Dependent Claim 63 words

A method as in claim 1 further including, in transmission trunked usage, beginning to transmit channel drop signaling on said temporarily assigned working channel in response to receipt of an unkey message from a transmitting one of said first and second radio units without waiting for said transmitting radio unit to switch to a receive operation for reliably detecting said channel drop signaling.

Claim 16

Dependent Claim 135 words

Apparatus for achieving reliable and prompt communication within a trunked radio repeater system having a digital control channel and plural working channels, which working channels are assigned for temporary use of individual radio units specified by digital control signals on the control channel, said apparatus comprising: at least one repeater transceiver that transmits and receives, over said control channel and over at least one temporarily assigned working channel, digital signals associated with a particular communique; and at least one mobile or portable radio transceiver that receives and detects as part of said digital signals associated with said particular communique, on at least one of said control channel or an assigned working channel, a call type signal identifying whether the usage of the working channel for said particular communique is to be transmission or message trunked.

Claim 17

Dependent Claim 135 words

Apparatus for achieving reliable and prompt communication within a trunked radio repeater system having a digital control channel and plural working channels, which working channels are assigned for temporary use of individual radio units specified by digital control signals on the control channel, said apparatus comprising: at least one repeater transceiver that transmits and receives, over said control channel and over at least one temporarily assigned working channel, digital signals associated with a particular communique; and at least one mobile or portable radio transceiver that receives and detects as part of said digital signals associated with said particular communique, on at least one of said control channel or an assigned working channel, a call type signal identifying whether the usage of the working channel for said particular communique is to be transmission or message trunked.

Claim 18

Independent Claim 156 words

A method of operating a digitally trunked radio communication system including at least one radio unit capable of operating in either of a transmission trunked mode and a message trunked mode, said method comprising the steps of: (a) sending, over the air as part of digital signalling associated with a particular communique involving said radio unit: (1) a first digital code identifying said radio unit; (2) a second digital code identifying a working channel, and (3) a third digital code specifying transmission or message trunking usage of said identified working channel for said particular communique; (b) receiving said first, second and third digital codes with said radio unit; and (c) in response to said digital codes received by said receiving step (b), temporarily operating said radio unit identified by said first digital code, for that particular communique, on said working channel identified by said second code in said trunking mode identified by said third digital code.

Claim 19

Independent Claim 156 words

A method of operating a digitally trunked radio communication system including at least one radio unit capable of operating in either of a transmission trunked mode and a message trunked mode, said method comprising the steps of: (a) sending, over the air as part of digital signalling associated with a particular communique involving said radio unit: (1) a first digital code identifying said radio unit; (2) a second digital code identifying a working channel, and (3) a third digital code specifying transmission or message trunking usage of said identified working channel for said particular communique; (b) receiving said first, second and third digital codes with said radio unit; and (c) in response to said digital codes received by said receiving step (b), temporarily operating said radio unit identified by said first digital code, for that particular communique, on said working channel identified by said second code in said trunking mode identified by said third digital code.

Claim 20

Dependent Claim 86 words

A method as in claim 16 further comprising the steps of: leaving said working channel and returning to said digital control channel substantially immediately upon completion of a transmission, when said third digital code has a first predetermined value indicating transmission trunking; and waiting on said working channel for a predetermined delay time after completion of a transmission to receive a possible response from said transmission over said same temporarily assigned working channel, when said third digital code has a second predetermined value indicating message trunking.

Annuity Stage	Window Opens	Payment Deadline	Surcharge Period Until	Estimated Fee	Status
3.5 Years (Year 4)	2002-01-25	2002-07-27	2003-01-26	$2000.00	Window Closed / Lapsed
7.5 Years (Year 8)	2006-01-25	2006-07-27	2007-01-26	$3760.00	Window Closed / Lapsed
11.5 Years (Year 12)	2010-01-25	2010-07-27	2011-01-26	$7700.00	Window Closed / Lapsed

Operating a trunked communication system in transmission and message trunked modes

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