US3643031A
Expired / Lapsed
US
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Time division multiplexing communication system
Assignee: Fujitsu Ltd
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Filing: 1969-09-15
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Granted: 1972-02-15
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Expires: 1989-09-15
Abstract
Abstract A time division multiplexing communication system has a plurality of stations and a switching station. Two of the stations communicate with each other via the switching station by utilizing signals comprising a block having a plurality of words each comprising a plurality of frames which are bursts of a constant time length. Each of the stations comprises channel rearrangement control means for rearranging ground channels to satellite channels and for rearranging satellite channels to ground channels in accordance with informations from an order data channel. Burst synchronism control means connected to the channel rearrangement control means provides the timing of transmission and reception of bursts. Order word controls means connected to the channel rearrangement control means receives command data, provides an order data channel, changes the command data to the format of the order data channel, transmits the format to the other stations and assembles a word from the order data channel information received from the other stations. Command control means is connected to the order word control means, the channel rearrangement control means and the burst synchronism control means and is controlled by a program to discriminate the condition of operation of the channel rearrangement control means, the burst synchronism control means and the order word control means, and supplies thereto command data commanding the means to operate. The order word control means transfers the work assembled from the order data channel received from the other stations to the command control unit when the word is directed to the station. Block synchronism controlling means controls the timing of transmission and reception of the blocks and provides block synchronism for blocks of period TB determined in accordance with the equations nTB > OR = Tl +TP and (n- 1)TB < OR = TS wherein TB is the period of the block period, TS is the period of time required for an electrical wave to travel from the station closest Tl the switching station and back to the station, T+is the period of time required for an electrical wave to travel from the station farthest from the switching station and back to the station, TP is the period of time required for each of the stations to provide the necessary operations based on received information and n is a positive integer.
Inventors
- 👤 Hiroshi Sasaki
- 👤 Tatsuo Maruyama
- 👤 Hisao Kanzaki
- 👤 Yasuhiko Sakamoto
- 👤 Nobuyuki Yasoshima
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 13:21
CPC Classifications
H; H04; H04B; H04B7/00; H04B7/14; H04B7/15; H04B7/204; H04B7/212; H04B7/2121; H04B7/2123
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
385 words
A time division multiplexing communication system having a plurality of stations and a switching station (SA), two of said stations communicating with each other via the switching station by utilizing signals comprising a block having a plurality of words each comprising a plurality of frames which are bursts of a constant time length, each of said stations comprising channel rearrangement control means for rearranging ground channels to satellite channels and for rearranging satellite channels to ground channels in accordance with informations from an order data channel; burst synchronism control means (BSU) connected to the channel rearrangement control means for providing the timinG of transmission and reception of bursts; order word control means (DLU) connected to the channel rearrangement control means for receiving command data, providing an order data channel, changing the command data to the format of the order data channel, transmitting said format to the other stations and assembling a word from the order data channel information received from the other stations; command control means (CMU) connected to the order word control means, the channel rearrangement control means and the burst synchronism control means and controlled by a program to discriminate the condition of operation of the channel rearrangement control means, the burst synchronism control means and the order word control means and supplying thereto command data commanding said means to operate, said order word control means transferring the word assembled from the order data channel received from the other stations to the command control unit when said word is directed to the station; block synchronism controlling means for controlling the timing of transmission and reception of the blocks and providing block synchronism for blocks of period TB determined in accordance with the equations nTB > OR = Tl+ TP and (n-1)TB < OR = TS wherein TB is the period of the block period, TS is the period of time required for an electrical wave to travel from the station closest to the switching station and back to said station, Tl is the period of time required for an electrical wave to travel from the station farthest from the switching station and back to said station, TP is the period of time required for each of the stations to provide the necessary operations based on received information and n is a positive integer.
Claim 2
Dependent Claim
385 words
A time division multiplexing communication system having a plurality of stations and a switching station (SA), two of said stations communicating with each other via the switching station by utilizing signals comprising a block having a plurality of words each comprising a plurality of frames which are bursts of a constant time length, each of said stations comprising channel rearrangement control means for rearranging ground channels to satellite channels and for rearranging satellite channels to ground channels in accordance with informations from an order data channel; burst synchronism control means (BSU) connected to the channel rearrangement control means for providing the timinG of transmission and reception of bursts; order word control means (DLU) connected to the channel rearrangement control means for receiving command data, providing an order data channel, changing the command data to the format of the order data channel, transmitting said format to the other stations and assembling a word from the order data channel information received from the other stations; command control means (CMU) connected to the order word control means, the channel rearrangement control means and the burst synchronism control means and controlled by a program to discriminate the condition of operation of the channel rearrangement control means, the burst synchronism control means and the order word control means and supplying thereto command data commanding said means to operate, said order word control means transferring the word assembled from the order data channel received from the other stations to the command control unit when said word is directed to the station; block synchronism controlling means for controlling the timing of transmission and reception of the blocks and providing block synchronism for blocks of period TB determined in accordance with the equations nTB > OR = Tl+ TP and (n-1)TB < OR = TS wherein TB is the period of the block period, TS is the period of time required for an electrical wave to travel from the station closest to the switching station and back to said station, Tl is the period of time required for an electrical wave to travel from the station farthest from the switching station and back to said station, TP is the period of time required for each of the stations to provide the necessary operations based on received information and n is a positive integer.
Claim 3
Dependent Claim
20 words
A time division multiplexing communication system as claimed in claim 1, wherein the switching station is a satellite in space.
Claim 4
Dependent Claim
162 words
A time division multiplexing communication system as claimed in claim 1, wherein said channel rearrangement control means includes a pair of channel number memory circuits for storing the relation between the time division channels and the time division multiplexing channels, one of said channel number memory circuits being utilized and the other being held in reserve, said plurality of stations including a standard station for transmitting the command for switching of the relation between channels to all the stations at an arbitrary time in broadcasting type in a manner whereby a station of said plurality of stations receiving said switching command writes the new relation between channels into the channel number memory circuit held in reserve and switches the previously utilized channel number memory circuit to reserve and said station transmits audio information by the new relation at the instant of completion of transmission of a word at the head of the first transmitting block after the reception of the switching command.
Claim 5
Dependent Claim
204 words
A time division multiplexing communication system as claimed in claim 1, wherein each station of said system has a block synchronism signal pattern and wherein said order word control means comprises a receiving memory for receiving and storing order channels, a coincidence-detecting circuit coupled to said receiving memory for supervising the coincidence of data stored in said receiving memory with the block synchronism signal a pattern, and a counter group coupled to said coincidence detecting circuit including block counting means for counting the number of blocks equal to the time required for the propagation of an electric wave between stations, word counting means for counting the number of words in a block and order channel counting means for counting the number of order channels in a word for correcting the time of initiation of a word and a block to provide a coincidence detecting output relating to the block synchronism signal pattern of a specific station in the frame of the coincidence detecting output of the blocK synchronism signal pattern of a standard station provided by counting of said counter group and for synchronizing so that time gaps in the blocks of all the stations of said system are received in the same frame.
Claim 6
Dependent Claim
102 words
A time division multiplexing communication system as claimed in claim 1, wherein said command means includes first memory means for storing transmission information, transmitting the block number and transmitting the word number relating to the transmission information and said order word control means includes second memory means for requesting retransmission and storing the transmitting station number, receiving block number and receiving word number of received information, said order word control means correcting error by providing the request for retransmission from the stored contents of said second memory means and retransmitting the transmission information from the stored contents of said first memory means.
Claim 7
Dependent Claim
105 words
A time division multiplexing communication system as claimed in claim 1, wherein said order word control means comprises a receiving memory for successively storing received informations and a receiving buffer memory coupled to said receiving memory for restoring the stored information of said receiving memory when a specific magnitude of information have been stored in said receiving memory, said receiving buffer memory storing a bit indicating if the information is directed to the station of said receiving buffer memory, and means for transmitting to said command unit under the control of said bit only the information directed to the station of said receiving buffer memory.
Claim 8
Dependent Claim
104 words
A time division multiplexing communication system as claimed in claim 3, wherein said channel rearrangement control means includes a second pair of channel memory circuits, one of said second pair of channel number memory circuits being utilized and the other being held in reserve, the previously reserved channel number memory circuit of said second pair being switched to utilization and the previously utilized channel number memory circuit of said second pair being switched to reserve after a delay of a number of blocks equal to the time required for the propagation of an electrical wave between stations after the reception of said switching command.
Claim 9
Dependent Claim
52 words
A time division multiplexing communication system as claimed in claim 4, wherein when the word counting means and the order channel counting means have specific magnitudes a synchronous condition is supervised in accordance with the provision of said coincidence detecting circuit of a coincidence output relating to the block synchronism signal pattern.
Claim 10
Dependent Claim
135 words
A time division multiplexing communication system as claimed in claim 6, wherein said order word control means further comprises a discriminating circuit coupled to said receiving buffer memory for determining the station to which a signal is to be transmitted and a check decoding detecting circuit coupled to said receiving buffer memory, said receiving buffer memory storing decoded information and said receiving buffer memory having a bit position for indicating whether information is directed to the station thereof in the address for storing decoded information, and when a signal is determined to be directed to the station of said discriminating circuit by said discriminating circuit and when received information is determined to be error-free by said check decoding detecting circuit, the received information is written into said specific bit position of said receiving buffer memory.
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) | 1975-02-14 | 1975-08-16 | 1976-02-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-02-14 | 1979-08-16 | 1980-02-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-02-14 | 1983-08-16 | 1984-02-15 | $7700.00 | Window Closed / Lapsed |