US6529486B1
Expired / Lapsed
US
⏱️ 0.0 years remaining
Trunked radio repeater communication system
Assignee: TRANSCRYPT INTERNATIONAL / E F JOHNSON Co
•
Filing: 1998-04-10
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Granted: 2003-03-04
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Expires: 2018-04-10
Abstract
Abstract A trunked radio repeater communication system capable of use in a networked system includes a plurality of distributive switches and a unique signaling protocol and a switching protocol for interconnecting the trunked transmission communications systems into a wide area network that provides an expanded feature set of radio communications capabilities. The trunked radio repeater system including a protocol supporting communications for repeaters and/or subscribers conducting communications using existing protocols, such as the Logic Trunked Radio (LTR) protocol and supporting additional special functions.
Inventors
- 👤 Keith W. Barnes
- 👤 Rory A. Smith
- 👤 Mervin L. Grindahl
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 12:08
CPC Classifications
H; H04; H04W; H04W84/00; H04W84/02; H04W84/04; H04W84/08; H04W56/00; H04W88/00; H04W88/18; H04W88/181
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
162 words
A communications protocol for a system of one or more repeaters and one or more subscribers, comprising: a plurality of word formats for communications between the one or more repeaters and the one or more subscribers, each word format including: a nine bit synchronization code for receiver synchronization; a one bit type code indicating a first word format and a second word format and compatible with protocols using an area code to identify subscribership to a particular repeater site; and a seven bit checksum code to error check communicated words; and where the first word format further includes: a five bit channel in use code to identify a channel in use; a five bit home code identifying a home channel; an eight bit group code providing a code for one or more groups of subscribers; and a five bit free code identifying a free channel; and wherein the second word format further includes function specific codes to perform a plurality of functions.
Claim 2
Dependent Claim
162 words
A communications protocol for a system of one or more repeaters and one or more subscribers, comprising: a plurality of word formats for communications between the one or more repeaters and the one or more subscribers, each word format including: a nine bit synchronization code for receiver synchronization; a one bit type code indicating a first word format and a second word format and compatible with protocols using an area code to identify subscribership to a particular repeater site; and a seven bit checksum code to error check communicated words; and where the first word format further includes: a five bit channel in use code to identify a channel in use; a five bit home code identifying a home channel; an eight bit group code providing a code for one or more groups of subscribers; and a five bit free code identifying a free channel; and wherein the second word format further includes function specific codes to perform a plurality of functions.
Claim 3
Dependent Claim
19 words
The communications protocol of claim 1 , where the communications protocol is compatible with Logic Trunked Radio (LTR) communications.
Claim 4
Dependent Claim
18 words
The communications protocol of claim 1 , where the first word format supports Logic Trunked Radio (LTR) communications.
Claim 5
Dependent Claim
22 words
The communications protocol of claim 1 , where the channel in use code is used to provide receive channels and transmit channels.
Claim 6
Dependent Claim
18 words
The communications protocol of claim 4 , where the receive channels and transmit channels have programmable relative offsets.
Claim 7
Dependent Claim
22 words
The communications protocol of claim 1 , where transmissions of the first word format are recognized by Logic Trunked Radio (LTR) subscribers.
Claim 8
Dependent Claim
24 words
The communications protocol of claim 1 , where transmissions of the second word format provide functions not supported by Logic Trunked Radio (LTR) subscribers.
Claim 9
Dependent Claim
27 words
The communications protocol of claim 1 , where the type code comprises a type bit compatible with an AREA bit of a Logic Trunked Radio (LTR) protocol.
Claim 10
Dependent Claim
21 words
The communications protocol of claim 1 , where the checksum code is inverted for transmissions from a subscriber to a repeater.
Claim 11
Dependent Claim
48 words
The communications protocol of claim 1 , where the type code comprises a type bit matching a Logic Trunked Radio (LTR) AREA code of a repeater site for transmissions of word according to the first word format, the type bit inverted for transmission of the second word format.
Claim 12
Dependent Claim
48 words
The communications protocol of claim 1 , where the type code comprises a type bit matching a Logic Trunked Radio (LTR) AREA code of a repeater site for transmissions of words according to the second word format, the type bit inverted for transmissions of the first word format.
Claim 13
Dependent Claim
30 words
The communications protocol of claim 1 , where the type code comprises a type bit in a bit position equal to that of a Logic Trunked Radio (LTR) AREA bit.
Claim 14
Dependent Claim
24 words
The communications protocol of claim 1 , where the home code, free code, and channel in use code are used in home channel aliasing.
Claim 15
Dependent Claim
25 words
The communications protocol of claim 1 , where the home code, free code, group code and channel in use code are used in call grouping.
Claim 16
Dependent Claim
10 words
A radio incorporating the communications protocol of claim 1 .
Claim 17
Dependent Claim
10 words
A subscriber incorporating the communications protocol of claim 1 .
Claim 18
Dependent Claim
10 words
A repeater incorporating the communications protocol of claim 1 .
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2006-03-03 | 2006-09-02 | 2007-03-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2010-03-03 | 2010-09-02 | 2011-03-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2014-03-03 | 2014-09-02 | 2015-03-04 | $7700.00 | Window Closed / Lapsed |