US4001693A
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US
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Apparatus for establishing communication between a first radio transmitter and receiver and a second radio transmitter and receiver
Assignee: Ericsson Inc
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Filing: 1975-05-12
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Granted: 1977-01-04
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Expires: 1995-05-12
Abstract
Abstract In a radio communication system having a command or base station and one or more controlled or mobile stations, the base station continuously transmits outbound function messages in binary bit form to the mobile stations. Each outbound function message comprises a sequence of binary bits forming a first synchronizing word, a first address word transmitted three times, a second inverted synchronizing word, a second address word transmitted three times, a third inverted synchronizing word, and a command word transmitted three times. All mobile stations receive the outbound messages and synchronize on them, but only that mobile station whose address is transmitted responds. Each mobile station is synchronized when it properly receives two consecutive synchronizing words in sequence, and remains in synchronization unless five consecutive synchronizing word errors occur. The response from the mobile station to the base station is an inbound message also in binary bit form. Each inbound message comprises a preamble followed by the first synchronizing word, the first address word transmitted three times, the second inverted synchronizing word, the second address word transmitted three times, the third inverted synchronizing word, and a response word transmitted three times. This inbound message or response has a bit rate that is 11/2 times the outbound message bit rate so that other mobiles can respond to their respective messages as they are transmitted by the base station. The base station anticipates each inbound message and uses the preamble and the first synchronizing word to synchronize itself with the inbound message. Thus, high speed binary function controls are reliably provided between a base station and one or more mobile stations in the environment of radio frequencies, particularly those in the land mobile service.
Inventors
- 👤 Bill L. Stackhouse
- 👤 Theodore E. Taylor
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 13:27
CPC Classifications
H; H04; H04B; H04B7/00; H04B7/24; H04B7/26; H04J; H04J3/00; H04J3/02; H04J3/06; H04J3/0602; H04L; H04L7/00; H04L7/02; H04L7/033; H04L7/0331
Claims Analysis
Total Claims: 23
Claim 1
Independent Claim
544 words
For use in a radio communication system having at least a base station transmitter and receiver at one location and a mobile station transmitter and receiver at a second location, function control apparatus for establishing communication between said stations comprising: a. means for for producing outbound messages having a sequence of binary bits at a first rate, each outbound message comprising a first synchronizing word of S bits, where S is an integer greater than two, a first address word, a second synchronizing word of S bits that is the binary inversion of said first synchronizing word, a second address word, a third synchronizing word of S bits that is the binary inversion of said first synchronizing word, and a command word; b. means connected to said outbound message producing means and for connection to said base station transmitter for supplying said outbound messages thereto; c. means for connection to said mobile station receiver for deriving said outbound messages transmitted by said base station transmitter and received by said mobile station receiver; d. synchronizing means connected to said deriving means of said mobile station receiver for producing an in-synchronization signal in response to said first synchronizing word and said second synchronizing word of said received outbound messages each having a respective predetermined sequence of binary values and for producing an out-of-synchronization signal in response to a predetermined plurality of sequential synchronizing words of said received outbound messages each having a sequence of binary values that is different from its respective predetermined sequence of binary values; e. means connected to said synchronizing means of said mobile station and connected to said deriving means of said mobile station for producing an inbound message in response to said in-synchronization signal and in response to said first and second address words of an outbound message having a predetermined sequence of binary values, said inbound message having a sequence of binary bits at a second rate that is greater than said first rate of said binary bits of said outbound messages, each inbound message comprising a synchronizing preamble, said first synchronizing word of S bits, said first address word, said second synchronizing word of S bits, said second address word, said third synchronizing word of S bits, and a response word; f. means connected to said inbound message producing means and for connection to said mobile station transmitter for applying said inbound message thereto; g. means for connection to said base station receiver for deriving an inbound message transmitted by said mobile station transmitter and received by said base station receiver; h. synchronizing means connected to said deriving means of said base station for determining the binary values of each group of N equally spaced bits in said synchronizing words of said inbound message, where N is an integer greater than two, and S/N is an integer greater than one; producing a bit representing the majority binary value of said N bits of each of said groups; and producing an in-synchronization signal in response to said representative bits having a predetermined sequence of binary values; i. and utilizing means connected to said synchronizing means of said base station for utilizing said derived inbound message in response to said in-synchronization signal produced by said synchronizing means of said base station.
Claim 2
Dependent Claim
544 words
For use in a radio communication system having at least a base station transmitter and receiver at one location and a mobile station transmitter and receiver at a second location, function control apparatus for establishing communication between said stations comprising: a. means for for producing outbound messages having a sequence of binary bits at a first rate, each outbound message comprising a first synchronizing word of S bits, where S is an integer greater than two, a first address word, a second synchronizing word of S bits that is the binary inversion of said first synchronizing word, a second address word, a third synchronizing word of S bits that is the binary inversion of said first synchronizing word, and a command word; b. means connected to said outbound message producing means and for connection to said base station transmitter for supplying said outbound messages thereto; c. means for connection to said mobile station receiver for deriving said outbound messages transmitted by said base station transmitter and received by said mobile station receiver; d. synchronizing means connected to said deriving means of said mobile station receiver for producing an in-synchronization signal in response to said first synchronizing word and said second synchronizing word of said received outbound messages each having a respective predetermined sequence of binary values and for producing an out-of-synchronization signal in response to a predetermined plurality of sequential synchronizing words of said received outbound messages each having a sequence of binary values that is different from its respective predetermined sequence of binary values; e. means connected to said synchronizing means of said mobile station and connected to said deriving means of said mobile station for producing an inbound message in response to said in-synchronization signal and in response to said first and second address words of an outbound message having a predetermined sequence of binary values, said inbound message having a sequence of binary bits at a second rate that is greater than said first rate of said binary bits of said outbound messages, each inbound message comprising a synchronizing preamble, said first synchronizing word of S bits, said first address word, said second synchronizing word of S bits, said second address word, said third synchronizing word of S bits, and a response word; f. means connected to said inbound message producing means and for connection to said mobile station transmitter for applying said inbound message thereto; g. means for connection to said base station receiver for deriving an inbound message transmitted by said mobile station transmitter and received by said base station receiver; h. synchronizing means connected to said deriving means of said base station for determining the binary values of each group of N equally spaced bits in said synchronizing words of said inbound message, where N is an integer greater than two, and S/N is an integer greater than one; producing a bit representing the majority binary value of said N bits of each of said groups; and producing an in-synchronization signal in response to said representative bits having a predetermined sequence of binary values; i. and utilizing means connected to said synchronizing means of said base station for utilizing said derived inbound message in response to said in-synchronization signal produced by said synchronizing means of said base station.
Claim 3
Dependent Claim
16 words
The function control apparatus of claim 1 wherein S is nine and wherein N is three.
Claim 4
Dependent Claim
52 words
The function control apparatus of claim 1 wherein each of said first synchronizing words of all messages comprises nine bits having the binary values 011100100, and wherein there are three groups comprising the first, fourth, and seventh bits, the second, fifth, and eighth bits, and the third, sixth, and ninth bits respectively.
Claim 5
Dependent Claim
35 words
The function control apparatus of claim 3 wherein the binary values of each group are determined by the first through third bits and the fourth through ninth bits being logically inverted relative to each other.
Claim 6
Dependent Claim
21 words
The function control apparatus of claim 4 wherein said second bit rate is one and one-half times said first bit rate.
Claim 7
Dependent Claim
394 words
In a communication system having at least one command station transmitter and receiver and a plurality of controlled stations, each having a transmitter and receiver, apparatus for establishing communication between said command station and one of said controlled stations comprising: a. first means for connection to said command station transmitter for applying binary outbound messages thereto, each of said outbound messages comprising a first synchronizing word of nine bits, a first address word, a second synchronizing word of nine bits that is the logic inversion of said first synchronizing word, a second address word, a third synchronizing word of nine bits that is the logic inversion of said first synchronizing word, and a command word in that order; b. second means for connection to said one controlled station receiver for deriving said outbound messages received thereby; c. third means connected to said second means for indicating proper receipt of at least said first and second synchronizing words and producing an in-synchronization signal; d. fourth means connected to said second and third means for producing a binary inbound message in response to an in-synchronization signal and in response to said first and second address words of said outbound message being designated for said one controlled station, said binary inbound message comprising a preamble, said first synchronizing word, said first address word, said second synchronizing word, said second address word, said third synchronizing word, and a response word in that order, the binary rate of said inbound message being greater than the binary rate of said outbound message; e. fifth means for connecting said fourth means to said controlled station transmitter for applying said inbound message thereto; f. sixth means for connection to said command station receiver for deriving said inbound message received thereby; g. seventh means connected to said sixth means for voting on the logic majority of a group formed of every first, fourth and seventh bits, a group formed of every second, fifth and eighth bits, and a group formed of every third, sixth, and ninth bits forming said synchronizing words; h. eighth means connected to said seventh means for producing an in-synchronization signal in response to the logic majority of said three groups having a predetermined code; i. and ninth means connected to said sixth means and to said eighth means for utilizing said inbound message in response to said in-synchronization signal.
Claim 8
Dependent Claim
394 words
In a communication system having at least one command station transmitter and receiver and a plurality of controlled stations, each having a transmitter and receiver, apparatus for establishing communication between said command station and one of said controlled stations comprising: a. first means for connection to said command station transmitter for applying binary outbound messages thereto, each of said outbound messages comprising a first synchronizing word of nine bits, a first address word, a second synchronizing word of nine bits that is the logic inversion of said first synchronizing word, a second address word, a third synchronizing word of nine bits that is the logic inversion of said first synchronizing word, and a command word in that order; b. second means for connection to said one controlled station receiver for deriving said outbound messages received thereby; c. third means connected to said second means for indicating proper receipt of at least said first and second synchronizing words and producing an in-synchronization signal; d. fourth means connected to said second and third means for producing a binary inbound message in response to an in-synchronization signal and in response to said first and second address words of said outbound message being designated for said one controlled station, said binary inbound message comprising a preamble, said first synchronizing word, said first address word, said second synchronizing word, said second address word, said third synchronizing word, and a response word in that order, the binary rate of said inbound message being greater than the binary rate of said outbound message; e. fifth means for connecting said fourth means to said controlled station transmitter for applying said inbound message thereto; f. sixth means for connection to said command station receiver for deriving said inbound message received thereby; g. seventh means connected to said sixth means for voting on the logic majority of a group formed of every first, fourth and seventh bits, a group formed of every second, fifth and eighth bits, and a group formed of every third, sixth, and ninth bits forming said synchronizing words; h. eighth means connected to said seventh means for producing an in-synchronization signal in response to the logic majority of said three groups having a predetermined code; i. and ninth means connected to said sixth means and to said eighth means for utilizing said inbound message in response to said in-synchronization signal.
Claim 9
Dependent Claim
22 words
The function control apparatus of claim 6 wherein each of said first synchronizing words of all messages comprises the binary values 011100100.
Claim 10
Dependent Claim
35 words
The function control apparatus of claim 7 wherein said seventh means votes on the binary values of said first through third bits and said fourth through ninth bits being logically inverted relative to each other.
Claim 11
Dependent Claim
27 words
The function control apparatus of claim 8 wherein said binary rate of said inbound message is one and one-half times said binary rate of said outbound message.
Claim 12
Dependent Claim
191 words
For use in a radio communication system having at least a transmitter at one location that transmits a synchronizing word of nine binary bits in a sequence, and a receiver at a second location for receiving said synchronizing word, apparatus for indicating that said receiver is synchronized with said transmitter comprising: a. first means for connection to said receiver for deriving as a group every first, fourth, and seventh bit as said sequence of bits received by said receiver progresses through said first means; b. second means connected to said first means for inverting the binary value of said derived fourth bit; c. third means connected to said first means for inverting the binary value of said derived seventh bit; d. voting means connected to said first, second, and third means for determining the majority binary value of each group comprising said first derived bit, said inverted fourth derived bit, and said inverted seventh derived bit; e. storage means connected to said voting means for storing each determined majority binary value; f. and indicating means connected to said storage means for indicating that the stored binary values have a predetermined code.
Claim 13
Dependent Claim
191 words
For use in a radio communication system having at least a transmitter at one location that transmits a synchronizing word of nine binary bits in a sequence, and a receiver at a second location for receiving said synchronizing word, apparatus for indicating that said receiver is synchronized with said transmitter comprising: a. first means for connection to said receiver for deriving as a group every first, fourth, and seventh bit as said sequence of bits received by said receiver progresses through said first means; b. second means connected to said first means for inverting the binary value of said derived fourth bit; c. third means connected to said first means for inverting the binary value of said derived seventh bit; d. voting means connected to said first, second, and third means for determining the majority binary value of each group comprising said first derived bit, said inverted fourth derived bit, and said inverted seventh derived bit; e. storage means connected to said voting means for storing each determined majority binary value; f. and indicating means connected to said storage means for indicating that the stored binary values have a predetermined code.
Claim 14
Dependent Claim
23 words
The indicating apparatus of claim 10 wherein said indicating means comprise means for indicating that three stored binary values have a predetermined code.
Claim 15
Dependent Claim
12 words
The indicating apparatus of claim 10 wherein said predetermined code is 011.
Claim 16
Dependent Claim
171 words
For use in a radio communication system having at least a transmitter at one location that transmits a synchronizing word of nine binary bits in a sequence, and a receiver at a second location for receiving said synchronizing word, apparatus for indicating that said receiver is synchronized with said transmitter comprising: a. first means for connection to said receiver for deriving as a group every first, fourth, and seventh bit as said sequence of bits received by said receiver progresses through said first means; b. second means connected to said first means for inverting the binary value of said derived first bit; c. voting means connected to said first and second means for determining the majority binary value of each group comprising said inverted first derived bit, said fourth derived bit, and said seventh derived bit; d. storage means connected to said voting means for storing each determined majority binary value; e. and indicating means connected to said storage means for indicating that the stored binary values have a predetermined code.
Claim 17
Dependent Claim
171 words
For use in a radio communication system having at least a transmitter at one location that transmits a synchronizing word of nine binary bits in a sequence, and a receiver at a second location for receiving said synchronizing word, apparatus for indicating that said receiver is synchronized with said transmitter comprising: a. first means for connection to said receiver for deriving as a group every first, fourth, and seventh bit as said sequence of bits received by said receiver progresses through said first means; b. second means connected to said first means for inverting the binary value of said derived first bit; c. voting means connected to said first and second means for determining the majority binary value of each group comprising said inverted first derived bit, said fourth derived bit, and said seventh derived bit; d. storage means connected to said voting means for storing each determined majority binary value; e. and indicating means connected to said storage means for indicating that the stored binary values have a predetermined code.
Claim 18
Dependent Claim
23 words
The indicating apparatus of claim 13 wherein said indicating means comprise means for indicating that three stored binary values have a predetermined code.
Claim 19
Dependent Claim
12 words
The indicating apparatus of claim 13 wherein said predetermined code is 100.
Claim 20
Dependent Claim
206 words
For use in a radio communication system having at least a transmitter at one location that transmits a synchronizing word of nine bit values in a sequence, and a receiver at a second location for receiving said synchronizing word, apparatus for indicating that said receiver and said transmitter are in synchronization comprising: a. first means for connection to said receiver for deriving at least one received synchronizing word therefrom; b. second means connected to said first means for inverting the binary bit values of the fourth, fifth, sixth, seventh, eighth, and ninth bits of said synchronizing word as said sequence progresses through said first means; c. third means connected to said first means and to said second means for producing a first signal representing the logic majority of a normal first, inverted fourth, and inverted seventh bits of said sequence; a second signal representing the logic majority of a normal second, inverted fifth, and inverted eighth bits of said sequence; a third signal representing the logic majority of a normal third, inverted sixth, and inverted ninth bits of said sequence; d. and fourth means connected to said third means for producing an in-synchronization signal in response to said first, second, and third signals having predetermined values.
Claim 21
Dependent Claim
206 words
For use in a radio communication system having at least a transmitter at one location that transmits a synchronizing word of nine bit values in a sequence, and a receiver at a second location for receiving said synchronizing word, apparatus for indicating that said receiver and said transmitter are in synchronization comprising: a. first means for connection to said receiver for deriving at least one received synchronizing word therefrom; b. second means connected to said first means for inverting the binary bit values of the fourth, fifth, sixth, seventh, eighth, and ninth bits of said synchronizing word as said sequence progresses through said first means; c. third means connected to said first means and to said second means for producing a first signal representing the logic majority of a normal first, inverted fourth, and inverted seventh bits of said sequence; a second signal representing the logic majority of a normal second, inverted fifth, and inverted eighth bits of said sequence; a third signal representing the logic majority of a normal third, inverted sixth, and inverted ninth bits of said sequence; d. and fourth means connected to said third means for producing an in-synchronization signal in response to said first, second, and third signals having predetermined values.
Claim 22
Dependent Claim
203 words
For use in a radio communication system having at least a transmitter at one location that transmits a synchronizing word of nine bit values in a sequence, and a receiver at a second location for receiving said synchronizing word, apparatus for indicating that said receiver and said transmitter are in synchronization comprising: a. first means for connection to said receiver for deriving at least one received synchronizing word therefrom; b. second means connected to said first means for inverting the binary bit values of the first, second, and third bits of said synchronizing word as said sequence progresses through said first means; c. third means connected to said first means and to said second means for producing a first signal representing the logic majority of an inverted first, normal fourth, and normal seventh bits of said sequence; a second signal representing the logic majority of an inverted second, normal fifth, and normal eighth bits of said sequence; a third signal representing the logic majority of an inverted third, normal sixth, and normal ninth bits of said sequence; d. and fourth means connected to said third means for producing an in-synchronization signal in response to said first, second, and third signals having predetermined values.
Claim 23
Dependent Claim
203 words
For use in a radio communication system having at least a transmitter at one location that transmits a synchronizing word of nine bit values in a sequence, and a receiver at a second location for receiving said synchronizing word, apparatus for indicating that said receiver and said transmitter are in synchronization comprising: a. first means for connection to said receiver for deriving at least one received synchronizing word therefrom; b. second means connected to said first means for inverting the binary bit values of the first, second, and third bits of said synchronizing word as said sequence progresses through said first means; c. third means connected to said first means and to said second means for producing a first signal representing the logic majority of an inverted first, normal fourth, and normal seventh bits of said sequence; a second signal representing the logic majority of an inverted second, normal fifth, and normal eighth bits of said sequence; a third signal representing the logic majority of an inverted third, normal sixth, and normal ninth bits of said sequence; d. and fourth means connected to said third means for producing an in-synchronization signal in response to said first, second, and third signals having predetermined values.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-01-04 | 1980-07-05 | 1981-01-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-01-04 | 1984-07-05 | 1985-01-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-01-04 | 1988-07-05 | 1989-01-04 | $7700.00 | Window Closed / Lapsed |