Patent US3177160A successfully refreshed from Google Patents.
Patent US5212715A successfully refreshed from Google Patents.
US5212715A
Expired / Lapsed
US
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Digital communication signalling system
Assignee: Motorola Solutions Inc
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Filing: 1991-01-25
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Granted: 1993-05-18
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Expires: 2011-01-25
Abstract
Abstract In frequency-hopping spread-spectrum systems, it is necessary to maintain frequency and bit synchronization (sync) between the transmitter and receiver in order to maintain quality data recovery at the receiver. A protocol is described which includes a synthesizer lock field (109) to allow frequency sync, a clock sync field (123) to achieve quick clock sync, and a data sync field (125) to provide data sync. Other fields are provided in the protocol to allow both voice (141) and data (127) transmissions, inband signalling (139), and error correction (143). A method and apparatus, driven by a microprocessor (303) and ASIC (301) combination, are described that generate and transmit this protocol.
Inventors
- 👤 William F. Pickert
- 👤 James A. McDonald
- 👤 Thomas A. Sexton
- 👤 Charles J. Malek
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 21:57
CPC Classifications
H; H04; H04B; H04B1/00; H04B1/69; H04B1/713; H04B1/7156; H04B2001/71563; H04B2001/71566
Claims Analysis
Total Claims: 54
Claim 1
Independent Claim
96 words
A method of transmission in a communication system from a radio transmitter that communicates digital information to a radio receiver, comprising the steps of: generating a message frame having a format comprising: (i) a field enabling carrier frequency change and (ii) at least one data field for the digital information, said at least one data field comprising: (a) a transmitter ramp-up field, (b) a first unsynchronized signal overlap detection field, (c) a synchronization field, (d) a field containing the digital information, and (e) a second unsynchronized signal overlap detection field; and transmitting said generated message frame.
Claim 2
Independent Claim
96 words
A method of transmission in a communication system from a radio transmitter that communicates digital information to a radio receiver, comprising the steps of: generating a message frame having a format comprising: (i) a field enabling carrier frequency change and (ii) at least one data field for the digital information, said at least one data field comprising: (a) a transmitter ramp-up field, (b) a first unsynchronized signal overlap detection field, (c) a synchronization field, (d) a field containing the digital information, and (e) a second unsynchronized signal overlap detection field; and transmitting said generated message frame.
Claim 3
Dependent Claim
21 words
The method of transmission of claim 1, wherein said at least one data field further comprises (f) a transmitter ramp-down field.
Claim 4
Dependent Claim
21 words
The method of transmission of claim 1, wherein said synchronization field comprises: a clock synchronization field and a data synchronization field.
Claim 5
Dependent Claim
21 words
The method of transmission of claim 3, wherein said clock synchronization field is comprised of a repeated binary bit pattern 010101.
Claim 6
Dependent Claim
23 words
The method of transmission of claim 3, wherein said data synchronization field is comprised of the number 446E D3A4 F272 in hexadecimal notation.
Claim 7
Dependent Claim
23 words
The method of transmission of claim 3, wherein said data synchronization field is comprised of the number BB91 2C5B 0D8D in hexadecimal notation.
Claim 8
Dependent Claim
58 words
The method of transmission of claim 3, wherein there are at least two data fields for the digital information and said synchronization field is comprised of the hexadecimal number BB91 2C5B in a first of the at least two data fields and the hexadecimal number BB91 2C5B 0D8D in a second of the at least two data fields.
Claim 9
Independent Claim
101 words
A method of transmission in a communication system from a radio transmitter that communicates digital information to a radio receiver, comprising the steps of: generating a message frame having a format comprising: (i) a field enabling carrier frequency change and (ii) at least one data field for the digital information, said at least one data field comprising: (a) a transmitter ramp-up field, (b) a first unsynchronized signal overlap detection field, (c) a synchronization field, (d) an inband signalling field, (e) a field containing the digital information, and (f) a second unsynchronized signal overlap detection field; and transmitting said generated message frame.
Claim 10
Independent Claim
101 words
A method of transmission in a communication system from a radio transmitter that communicates digital information to a radio receiver, comprising the steps of: generating a message frame having a format comprising: (i) a field enabling carrier frequency change and (ii) at least one data field for the digital information, said at least one data field comprising: (a) a transmitter ramp-up field, (b) a first unsynchronized signal overlap detection field, (c) a synchronization field, (d) an inband signalling field, (e) a field containing the digital information, and (f) a second unsynchronized signal overlap detection field; and transmitting said generated message frame.
Claim 11
Dependent Claim
21 words
The method of transmission of claim 8, wherein said at least one data field further comprises (g) an error detection field.
Claim 12
Dependent Claim
21 words
The method of transmission of claim 8, wherein said at least one data field further comprises (h) a transmitter ramp-down field.
Claim 13
Independent Claim
76 words
A method of transmission in a communication system from a radio transmitter that communicates digital information to a radio receiver, comprising the steps of: generating a message frame having a format comprising: (i) a field enabling carrier frequency change and (ii) at least one data field for the digital information, said at least one data field comprising: (a) a transmitter ramp-up field and (b) a field containing the digital information; and transmitting said generated message frame.
Claim 14
Independent Claim
76 words
A method of transmission in a communication system from a radio transmitter that communicates digital information to a radio receiver, comprising the steps of: generating a message frame having a format comprising: (i) a field enabling carrier frequency change and (ii) at least one data field for the digital information, said at least one data field comprising: (a) a transmitter ramp-up field and (b) a field containing the digital information; and transmitting said generated message frame.
Claim 15
Dependent Claim
21 words
The method of transmission of claim 11, wherein said at least one data field further comprises (c) a transmitter ramp-down field.
Claim 16
Dependent Claim
22 words
The method of transmission of claim 11, wherein said digital information field comprises at least two bits of a communication unit identification.
Claim 17
Dependent Claim
29 words
The method of transmission of claim 11, wherein said digital information field comprises at least two bits of a communication unit identification encoded in a (23, 12) Golay code.
Claim 18
Dependent Claim
95 words
A communication system with a radio transmitter that communicates digital information to a radio receiver, the communication system comprising: means for generating a message frame having a format comprising: (i) a field enabling carrier frequency change and (ii) at least one data field for the digital information, said at least one data field comprising: (a) a transmitter ramp-up field, (b) a first unsynchronized signal overlap detection field, (c) a synchronization field, (d) a field containing the digital information, and (e) a second unsynchronized signal overlap detection field; and means for transmiting said generated message frame.
Claim 19
Dependent Claim
95 words
A communication system with a radio transmitter that communicates digital information to a radio receiver, the communication system comprising: means for generating a message frame having a format comprising: (i) a field enabling carrier frequency change and (ii) at least one data field for the digital information, said at least one data field comprising: (a) a transmitter ramp-up field, (b) a first unsynchronized signal overlap detection field, (c) a synchronization field, (d) a field containing the digital information, and (e) a second unsynchronized signal overlap detection field; and means for transmiting said generated message frame.
Claim 20
Dependent Claim
20 words
The communication system of claim 15, wherein said at least one data field further comprises (f) a transmitter ramp-down field.
Claim 21
Dependent Claim
20 words
The communication system of claim 15, wherein said synchronization field comprises: a clock synchronization field and a data synchronization field.
Claim 22
Dependent Claim
20 words
The communication system of claim 17, wherein said clock synchronization field is comprised of a repeated binary bit pattern 010101.
Claim 23
Dependent Claim
22 words
The communication system of claim 17, wherein said data synchronization field is comprised of the number 446E D3A4 F272 in hexadecimal notation.
Claim 24
Dependent Claim
22 words
The communication system of claim 17, wherein said data synchronization field is comprised of the number BB91 2C5B 0D8D in hexadecimal notation.
Claim 25
Dependent Claim
57 words
The communication system of claim 17, wherein there are at least two data fields for the digital information and said synchronization field is comprised of the hexadecimal number BB91 2C5B in a first of the at least two data fields and the hexadecimal number BB91 2C5B 0D8D in a second of the at least two data fields.
Claim 26
Dependent Claim
100 words
A communication system with a radio transmitter that communicates digital information to a radio receiver, the communication system comprising: means for generating a message frame having a format comprising: (i) a field enabling carrier frequency change and (ii) at least one data field for the digital information, said at least one data field comprising: (a) a transmitter ramp-up field, (b) a first unsynchronized signal overlap detection field, (c) a synchronization field, (d) an inband signalling field, (e) a field containing the digital information, and (f) a second unsynchronized signal overlap detection field; and means for transmitting said generated message frame.
Claim 27
Dependent Claim
100 words
A communication system with a radio transmitter that communicates digital information to a radio receiver, the communication system comprising: means for generating a message frame having a format comprising: (i) a field enabling carrier frequency change and (ii) at least one data field for the digital information, said at least one data field comprising: (a) a transmitter ramp-up field, (b) a first unsynchronized signal overlap detection field, (c) a synchronization field, (d) an inband signalling field, (e) a field containing the digital information, and (f) a second unsynchronized signal overlap detection field; and means for transmitting said generated message frame.
Claim 28
Dependent Claim
20 words
The communication system of claim 22, wherein said at least one data field further comprises (g) an error detection field.
Claim 29
Dependent Claim
20 words
The communication system of claim 22, wherein said at least one data field further comprises (h) a transmitter ramp-down field.
Claim 30
Dependent Claim
75 words
A communication system with a ratio transmitter that communicates digital information to a radio receiver, the communication system comprising: means for generating a message frame having a format comprising: (i) a field enabling carrier frequency change and (ii) at least one data field for the digital information, said at least one data field comprising: (a) a transmitter ramp-up field and (b) a field containing the digital information; and means for transmitting said generated message frame.
Claim 31
Dependent Claim
75 words
A communication system with a ratio transmitter that communicates digital information to a radio receiver, the communication system comprising: means for generating a message frame having a format comprising: (i) a field enabling carrier frequency change and (ii) at least one data field for the digital information, said at least one data field comprising: (a) a transmitter ramp-up field and (b) a field containing the digital information; and means for transmitting said generated message frame.
Claim 32
Dependent Claim
20 words
The communication system of claim 25, wherein said at least one data field further comprises (c) a transmitter ramp-down field.
Claim 33
Dependent Claim
21 words
The communication system of claim 25, wherein said digital information field comprises at least two bits of a communication unit identification.
Claim 34
Dependent Claim
27 words
The communication system of claim 25, wherein said digital information field comprises at least two bits of a communication unit identification encoded in a (23,12) Golay code.
Claim 35
Dependent Claim
127 words
A communication unit for use in a communication system with a ratio transmitter that communicates digital information to a radio receiver, the communication unit comprising: means for synthesizing at least one transmitter carrier frequency; means for processing the digital information; means, coupled to said means for processing, for generating a message frame having a format comprising: (i) a field enabling said at least one carrier frequency to change and (ii) at least one data field for the digital information, said at least one data field comprising: (a) a transmitter ramp-up field, (b) a first unsynchronized signal overlap detection field, (c) a synchronization field, (d) a field containing the digital information, and (e) a second unsynchronized signal overlap detection field; and means for transmitting said generated message frame.
Claim 36
Dependent Claim
127 words
A communication unit for use in a communication system with a ratio transmitter that communicates digital information to a radio receiver, the communication unit comprising: means for synthesizing at least one transmitter carrier frequency; means for processing the digital information; means, coupled to said means for processing, for generating a message frame having a format comprising: (i) a field enabling said at least one carrier frequency to change and (ii) at least one data field for the digital information, said at least one data field comprising: (a) a transmitter ramp-up field, (b) a first unsynchronized signal overlap detection field, (c) a synchronization field, (d) a field containing the digital information, and (e) a second unsynchronized signal overlap detection field; and means for transmitting said generated message frame.
Claim 37
Dependent Claim
20 words
The communication unit of claim 29, wherein said at least one transmitter carrier frequency is utilized in a frequency-hopping technique.
Claim 38
Dependent Claim
20 words
The communication unit of claim 29, wherein said at least one data field further comprises (f) a transmitter ramp-down field.
Claim 39
Dependent Claim
20 words
The communication unit of claim 29, wherein said synchronization field comprises: a clock synchronization field and a data synchronization field.
Claim 40
Dependent Claim
20 words
The communication unit of claim 32, wherein said clock synchronization field is comprised of a repeated binary bit pattern 010101.
Claim 41
Dependent Claim
21 words
The communication unit of claim 32, wherein said data synchronization field is comprised of the number 446E D3A4F272 in hexadecimal notation.
Claim 42
Dependent Claim
22 words
The communication unit of claim 32, wherein said data synchronization field is comprised of the number BB91 2C5B 0D8D in hexadecimal notation.
Claim 43
Dependent Claim
57 words
The communication unit of claim 32, wherein there are at least two data fields for the digital information and said synchronization field is comprised of the hexadecimal number BB91 2C5B in a first of the at least two data fields and the hexadecimal number BB91 2C5B 0D8D in a second of the at least two data fields.
Claim 44
Dependent Claim
126 words
A communication unit with a radio transmitter that communicates digital information to a radio receiver, the communication system comprising: means for synthesizing at least one transmitter carrier frequency; means for processing the digital information; means, coupled to said means for processing, for generating a message frame having a format comprising: (i) a field enabling said at least one carrier frequency to change and (ii) at least one data field for the digital information, said at least one data field comprising: (a) a transmitter ramp-up field, (b) a first unsynchronized signal overlap detection field, (c) a synchronization field, (d) an inband signalling field, (e) a field containing the digital information, and (f) a second unsynchronized signal overlap detection field; and means for transmitting said generated message frame.
Claim 45
Dependent Claim
126 words
A communication unit with a radio transmitter that communicates digital information to a radio receiver, the communication system comprising: means for synthesizing at least one transmitter carrier frequency; means for processing the digital information; means, coupled to said means for processing, for generating a message frame having a format comprising: (i) a field enabling said at least one carrier frequency to change and (ii) at least one data field for the digital information, said at least one data field comprising: (a) a transmitter ramp-up field, (b) a first unsynchronized signal overlap detection field, (c) a synchronization field, (d) an inband signalling field, (e) a field containing the digital information, and (f) a second unsynchronized signal overlap detection field; and means for transmitting said generated message frame.
Claim 46
Dependent Claim
20 words
The communication unit of claim 37, wherein said at least one transmitter carrier frequency is utilized in a frequency-hopping technique.
Claim 47
Dependent Claim
20 words
The communicaiton unit of claim 37, wherein said at least one data field further comprises (g) an error detection field.
Claim 48
Dependent Claim
20 words
The communication unit of claim 37, wherein said at least one data field further comprises (h) a transmitter ramp-down field.
Claim 49
Dependent Claim
101 words
A communication unit with a radio transmitter that communicates digital information to a radio receiver, the communication system comprising: means for synthesizing at least one transmitter carrier frequency; means for processing the digital information; means, coupled to said means for processing, for generating a message frame having a format comprising: (i) a field enabling said at least one carrier frequency to change and (ii) at least one data field for the digital information, said at least one data field comprising: (a) a transmitter ramp-up field and (b) a field containing the digital information; and means for transmitting said generated message frame.
Claim 50
Dependent Claim
101 words
A communication unit with a radio transmitter that communicates digital information to a radio receiver, the communication system comprising: means for synthesizing at least one transmitter carrier frequency; means for processing the digital information; means, coupled to said means for processing, for generating a message frame having a format comprising: (i) a field enabling said at least one carrier frequency to change and (ii) at least one data field for the digital information, said at least one data field comprising: (a) a transmitter ramp-up field and (b) a field containing the digital information; and means for transmitting said generated message frame.
Claim 51
Dependent Claim
20 words
The communication unit of claim 41, wherein said at least one transmitter carrier frequency is utilized in a frequency-hopping technique.
Claim 52
Dependent Claim
20 words
The communication unit of claim 41, wherein said at least one data field further comprises (c) a transmitter ramp-down field.
Claim 53
Dependent Claim
21 words
The communication unit of claim 41, wherein said digital information field comprises at least two bits of a communication unit identification.
Claim 54
Dependent Claim
27 words
The communication unit of claim 41, wherein said digital information field comprises at least two bits of a communication unit identification encoded in a (23,12) Golay code.
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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) | 1996-05-17 | 1996-11-16 | 1997-05-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-05-17 | 2000-11-16 | 2001-05-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-05-17 | 2004-11-16 | 2005-05-18 | $7700.00 | Window Closed / Lapsed |