WO2004057804A1 - データ伝送システム、データ伝送方法およびデータ伝送装置 - Google Patents
データ伝送システム、データ伝送方法およびデータ伝送装置 Download PDFInfo
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- WO2004057804A1 WO2004057804A1 PCT/JP2002/013274 JP0213274W WO2004057804A1 WO 2004057804 A1 WO2004057804 A1 WO 2004057804A1 JP 0213274 W JP0213274 W JP 0213274W WO 2004057804 A1 WO2004057804 A1 WO 2004057804A1
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- data transmission
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L12/00—Data switching networks
- H04L12/28—Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
- H04L12/42—Loop networks
- H04L12/427—Loop networks with decentralised control
Definitions
- the present invention relates to a data transmission system, and more specifically, to a predetermined protocol in a network in which a plurality of data transmission devices are connected in a ring shape. Therefore, the present invention relates to a data transmission system that transmits data in one direction.
- the transmission system according to FIG. 20 is the first node 1 0 0 1, the second node 1 0 0 2, the third node 1 0 0 3, the fourth node 1 0 0 4, You can have 5 nodes 1 0 0 5 and 6 nodes 1 0 0 6. Also, each node is connected in a ring shape by an optical transmission line 10 0 7.
- each node is connected in a ring shape to transmit data.
- the transmission frame 1 1 0 0 shown in Fig. 2 1 is a header area 1 1 0 1, a stream area 1 1 0 2, a control message area 1 1 0 3 and an auxiliary information area Have 1 1 0 4.
- the header area 1 1 0 1 contains information indicating the destination of the broadcast as well as indicating the beginning of the frame.
- actual data such as audio data and video data are written.
- control message area 1 1 0 3 a control message etc. is written.
- Auxiliary information area 1 1 Parity etc. are written in 0 4.
- Figure 22 is a diagram showing the flow of the transmission frame when actual data is transmitted for the first node 1 0 0 1 to the third node 1 0 0 3 is there .
- h (1 to 1 + 2) indicates a transmission frame that contains actual data.
- node 1 0 0 1 creates a transmission frame h (1), (2) and the transmission frame following it including the actual data.
- the first node 1 0 0 1 outputs it to the second node 1 0 0 2 in order to transmit the created transmission frame to the third node 1 0 0 3 .
- the second node 1 0 0 2 temporarily incorporates the transmission frame output from the 1st node 1 0 0 1 in order to process it.
- the second node 1 0 0 2 is output to the 3rd node 1 0 0 3 because the actual data in the transmission frame is not transmitted to itself.
- the third node 1 0 0 3 incorporates the transmission frame output from the 2 nd node 1 0 0 2 power into it.
- the 3rd node 1 0 0 3 is The actual data of the transmission frame is read out and stored internally. As a result, data is transmitted from the first node 1 0 0 1 to the third node 1 0 0 3.
- the third node 1 0 0 3 outputs the acquired transmission frame as it is to the 4th node 1 0 0 4.
- the fourth node 1 0 0 4 to the sixth node 1 0 0 6 are the second node mentioned above.
- the transmission frame is temporarily taken inside and output to the next node as it is.
- the transmission frame output from the first node 1 0 0 1 makes a round of the system and returns to the 1st node 1 0 0 1 again. .
- the first node 1 0 0 1 rewrites the contents of the acquired transmission frame with the contents of the subsequent actual data and outputs the result to the second node 1 0 0 2.
- the processing performed in the conventional transmission system is the same as the above processing. In this way, data transmission is performed in the conventional transmission system to which MOST is applied.
- the first node 1001 to the third node 1003 can be used.
- the transmission frame goes around in the transmission system. Therefore, in the conventional transmission system, the fourth node 1 0 0 4 force 6 th node 6 has no relation to the transmission from the first node 1 0 0 1 power to the third node 1 0 0 3
- the transmission frame also passes during the period 1 0 0 6.
- the purpose of the present invention is that, when communication is performed between some nodes, effective use of bandwidth in a route unrelated to the route of the node being communicated is It is possible to provide a possible transmission system. Disclosure of the invention
- the present invention has the following features in order to achieve the above-mentioned purpose.
- the first phase is a data transmission system in which data is transmitted in one direction according to a predetermined protocol in a network in which a plurality of data transmission devices are connected in a ring shape.
- the evening transmission devices are
- Another data transmission device that recognizes the part of the network integration used between the source and destination for data transmission;
- the judgment means judges that the part of the network that the recognition means recognizes and the part of the network that the machine uses between the source and destination for new data transmission do not overlap. If it does, it will be equipped with a sending means to start sending new data.
- the network in the network, as long as the portion used between the source and the sender's own transmission and the necessary information 3 is not duplicated, Multiple transmissions become possible. As a result, it is possible to make effective use of the area of the net.
- the data transmission device notifies other data transmission devices to start data transmission when the data transmission is started, respectively. Prepare for
- g 'means is used by other data transmission devices between transmission of data transmission and transmission destination based on the knowledge from notification means contained in other data transmission devices. It is characterized by recognizing the part of the piece
- the data At the start of transmission, the data
- each of the data transfer devices is provided with an identification number for identifying each of them.
- the evening transmission devices are each based on the notification from the notification means included in the other data transmission devices, the own device and other data
- a comparison means for comparing the identification number with that of The network includes the first and second data transmission devices,
- the determination means of the first data transmission device and the second data transmission device is configured such that the notification means of the first data transmission device and the notification means of the second data transmission device simultaneously start data transmission. And the other data transmission device, the part of the network used by the first data transmission device between the source and destination in data transmission, and the second data transmission. Whether or not the device overlaps with the part of the network used by the source and destination in data transmission,
- the comparison means of the first data transmission device and the second data transmission device is the part of the network that the first data transmission device uses in data transmission between the source and destination. If the determination means determines that the second data transmission apparatus overlaps the portion of the network used by the source and destination for data transmission, the first data The comparison between the identification number of the first transmission apparatus and the identification number of the second transmission apparatus is smaller,
- the transmission means of the first data transmission device and the second data transmission device the transmission means of the data transmission device determined to have the smaller identification number starts data transmission
- the transmission means of the data transmission device determined to have the larger identification number is characterized in that the transmission of the data is discontinued. Do.
- the source in the network is If a request to start data transmission is made simultaneously from two data transmitters, such that the part used by the destination and the destination is duplicated, the data transmission with the smaller identification number is prioritized. Be As a result, even in this case, the system can operate normally.
- a fourth aspect is characterized in that, in the first aspect, the predetermined protocol is M O S T (M e i a i O i s i s i s e t s e s s s s s s a a s a s o o p p t t t t t).
- the fourth aspect even in the network to which MOST is applied, a plurality of data transmissions are performed unless the portions used between the source and the destination overlap. Is possible.
- the fifth aspect that enables effective use of the network bandwidth is that, in the second phase, data is transmitted through a transmission frame that circulates in one direction in the network. It is characterized by being embedded and transmitted.
- each of the transmission means of the data transmission apparatus is a transmission file that is transmitted from another data transmission apparatus when new data transmission is performed. It is characterized in that the data in the frame is rewritten to the data to be transmitted by the own machine and transmitted.
- the data transmission apparatus performing the new data transmission rewrites the data of the transmission frame into data to be transmitted by the own device. So, even in a network where transmission frames circulate in the-direction, as long as the two communication paths do not overlap, It is possible for two communications to take place simultaneously.
- the transmission frame includes an area for storing information for notifying that the notification means starts data transmission, and a part of the area for storing data. It is characterized by having it.
- the area for storing data is provided with an area for storing information for notifying that the notification means starts data transmission.
- the notification method is always sent by default. It may not be used to notify you that it will start. Therefore, an area for storing information for notifying that the notification means starts data transmission is provided in the area where the data is stored, and the notification means is always available at any time.
- the eighth phase in which notification of the start of data transmission can be started, is a network in which a plurality of data transmission devices are connected in a ring shape, according to a predetermined protocol.
- the eighth aspect in the network, as long as the portion used between the source and the trustee does not overlap, multiple data transfer is possible. As a result, it is possible to effectively use the bandwidth of the network.
- a plurality of units are provided in the U-type network rack, and data is transmitted in one direction according to a predetermined procedure.
- a recognition means for recognizing a portion used between the transmission source and the transmission destination in the data transmission.
- the part of the network recognized by the recognition means by the judgment means does not overlap the part of the network used between the source and destination in new data transmission.
- FIG. 1 is a block diagram showing the entire configuration of a data transmission system according to an embodiment of the present invention.
- FIG. 2 is a diagram showing an example of stream region configuration according to an embodiment of the present invention.
- FIG. 3 is a block diagram showing the configuration of a transmitting / receiving apparatus according to an embodiment of the present invention.
- FIG. 4 is a diagram showing an example of the configuration of a band setting table according to an embodiment of the present invention.
- Figure 5 is a diagram showing the values of the fields of the transmission frame stream area 1 1 0 2.
- Figure 6 shows the flow of the transmission frame when the first node transmits data to the third node.
- Figure 7 shows the flow of the transmission frame when the first node transmits the data to the third node.
- Figure 8 shows the operation performed by the transmitting and receiving unit 300 of the first node 5 when the first node 5 transmits a transmission frame to the third node 15. It is a roundabout.
- Figure 9 shows that when Node 1 5 transmits a transmit frame to Node 3 15, the transmit and receive equipment for nodes other than Node 1 5 It is a flowchart showing the operation.
- 0 is a figure which shows the value of the field of the stream area 1 102 of a transmission frame.
- Figure 1 1 shows that node 1 5 is transmitting a transmission frame to node 3 5 and node 4 is node 4 0.
- 5 is a diagram showing the flow of a transmission frame when transmission frame transmission is started for node 5 5
- FIG. 10 is a diagram showing the flow of transmission frames when transmission frame transmission is started for 5;
- Figure 13 shows that if Node 1 5 is transmitting a transmission frame to Node 3 1 5, 4 th Node 20 et al.
- This is a flowchart showing the operation of the transmit / receive unit of the 4th node 20 when the transmission frame is transmitted between the 3rd node.
- Figure 14 shows the operation performed by the transmitting and receiving unit 300 of each node while communication is being performed between the fourth node 20 and the fifth node 25. It is a floating chart.
- Fig.15 it is assumed that the first node 5 and the third node 15 communicate with each other, and further that the fourth node 20 and the fifth node 25 communicate with each other.
- This figure shows the flow of the transmission frame when the first node 5 ends transmission frame transmission.
- Figure 17 shows the values of the fields in the stream area 1 102 of the transmission frame.
- the first node 5 transmits the transmission frame containing the actual data on the sixth node 30 and the fourth node 20 on the fifth node 25 It is a diagram showing the flow of a transmission frame when transmitting a transmission frame containing actual data.
- the first node 5 transmits the transmission frame including the actual data to the sixth node 30 and the fourth node 20 transmits the actual data to the fifth node 25.
- the first node 5 transmits the transmission frame including the actual data to the sixth node 30 and the fourth node 20 transmits the actual data to the fifth node 25.
- it is a flow that shows the operation that the first node 5 or the fourth node performs.
- Figure 20 is a block diagram showing the overall configuration of a conventional data transmission system.
- Figure 21 is a diagram showing an example of the configuration of transmission frames flowing in the data transmission system.
- FIG. 22 is a diagram showing the flow of the transmission frame when data is transmitted to the first node 1 0 0 1 to the third node 1 0 0 3 .
- BEST MODE FOR CARRYING OUT THE INVENTION In the following, a data transmission system according to an embodiment of the present invention will be described with reference to the drawings.
- FIG. 1 is a block diagram showing the entire configuration of the data transmission system according to the present embodiment.
- the data transmission system shown in Figure 1 is based on the first node 5, JP 2002/013274
- the second node 10, the third node 15, the fourth node 20, the fifth node 25 and the sixth node 30 are provided.
- Each node is realized by an audio device, a terminal such as a speaker, and a transmitting / receiving device, and is connected in a ring form by an optical transmission line 40.
- M ⁇ ST is applied as the communication method of the data transmission system according to this embodiment.
- the transmission frame has a structure suitable for communication by MST, specifically, the structure shown in Fig. 22.
- Fig. 2 is a diagram showing an example of the structure of the transmission frame.
- the transmission frame shown in Fig. 2 is a header area 1 1 0 1, a stream area 1 1 0 2, a control message area 1 1 0 3 and an auxiliary information area 1 1 0 4 Prepare for.
- the role of each area is explained in the section of the prior art, so the explanation is omitted.
- FIG. 2 is a diagram showing an example of the configuration of the stream area 1102 according to the present embodiment.
- the stream area 1 1 0 2 includes a band setting area 2 0 5 and an actual data section 2 1 0.
- the band setting area 205 is a part including information for causing each node to recognize the communication state of the data transmission system, and the transmission start indicator 2 1 5, the transmission in progress indicator 2 20, The transmission end indicator 2 2 5, transmission address 2 3 0, reception address 2 3 5 and data length 2 4 0 are included.
- the transmission start indicator 2 1 5 notifies each node of the transmission start of the transmission frame. More specifically, when the transmission start indicator 215 is 0, it means that data transmission between nodes is not started, and the transmission start indicator 251 is 1 In the case, it means that data transmission between nodes starts.
- transmission indicator 220 is a part that indicates that a transmission frame containing actual data is being transmitted in a data transmission system. More specifically, when the transmission in progress indicator 220 is 0, it means that the transmission frame does not contain actual data, and the transmission frame is 1 when it is 1. Means that the transmission frame contains actual data.
- the transmission end indicator 225 notifies each node that transmission of the transmission frame including the actual transmission has ended. More specifically, when the transmission end indicator is 0, it means that the scheduled transmission between nodes will not be ended, or the scheduled transmission will not be performed, and the transmission will be performed. When the end indicator is 1, it means that data transmission between nodes is ended.
- the transmission address section 230 is set by the transmission node or transmission end indicator 2 25 when transmission is started by the transmission start indicator 25. This part indicates the sender's node when transmission is terminated.
- the receiving address unit 2 3 5 has the receiving node or the receiving side when the transmission is started by the transmission start indicator 2 1 5. End of Transmission Indicator 2 This is a part that indicates the node on the receiving side when transmission is terminated by 5.
- the data length part 2 4 0 is a part that indicates the length of data in the real data part 2 1 0.
- the communication state information in the data transmission system is The included band setting area 2 0 5 is provided in the stream area 1 1 0 2. That is, in the data transmission system according to the present embodiment, usually, a part of the band used for transferring real data is always used for transmitting communication state information in the data transmission system. Yes. This makes it possible for each node to notify other nodes of the communication status at any time.
- the node includes a terminal such as an audio device and a transmitting / receiving device for transmitting / receiving a transmission frame.
- a terminal such as an audio device
- a transmitting / receiving device for transmitting / receiving a transmission frame.
- the transmission / reception device 300 obtains a transmission frame from a node present at the upper level of the own machine, and outputs the transmission frame to a node existing at the lower level of the own machine. .
- the transmission / reception apparatus 300 can transmit the transmission frame. Get actual data from it.
- the transmitting / receiving apparatus 300 allows its own device to communicate with other nodes while other nodes are communicating with each other. When it is started, it is judged whether communication is possible, and when communication is possible, it is notified to each node that communication will be started.
- the transmitter / receiver 300 includes a receiver 3 05, a transmission frame processor 3 1 0, a band setting processor 3 1 5, a table storage 3 2 0, an actual data processor 3 2 5 and a transmitter 3 3. Have a 0.
- the receiver unit 305 receives the transmission frame transmitted from the upper node of the own machine.
- the transmission frame processing unit 310 is realized by an MPU and a so-called MOSTLSI, and the transmission frame transmitted in the MOST format is converted into data in a format that can be read by the node terminal. It converts and further separates the bandwidth setting area 2 0 5 of the stream area 1 1 0 2 from the actual data section 2 1 0.
- the transmission frame processing unit 3 10 0 creates a stream area 1 1 0 2 from the band setting area 2 0 5 and the actual data part 2 1 0, and transmits it in the form of MOST. Create a frame and output it to the transmitter 3300.
- the band setting processing unit 3 1 5 is realized by the MPU, and creates a band setting area 2 0 5 based on the band setting table stored in the table storage unit 3 2 0.
- the table storage unit 320 stores the band setting table shown in FIG. 4 and is realized by the hard disk and the memory.
- the actual data processing unit 325 is realized by the MPU and outputs the data that is output from the terminal as the actual data to the transmission frame processing unit 310 as well as the transmission frame processing. Outputs the actual data output from part 3 1 0 to the terminal.
- the transmitting unit 330 transmits the transmission frame output from the transmission frame processing unit 310 to the lower node. Do.
- FIG. 4 is a diagram showing an example of the configuration of the bandwidth setting table.
- the bandwidth setting table is a table for managing which node is currently transmitting data to which node.
- the sender node is described vertically and the receiver node is described horizontally. Then, it indicates that communication is taking place between the sender node and the receiver node in the circled column.
- the band setting table shown in FIG. 4 is circled in the columns of the first node 5 of the transmitting node and the third node 15 of the receiving node. It means that the transmission frame is being transmitted to the first node 5 to the third node 15 because it is connected.
- each process shown in this embodiment can be realized as a software using a computer, or a dedicated eight-way circuit for performing each process. Can be realized by using
- Fig. 5 is a diagram showing the values of the fields of the transmission frame stream area 1 1 0 2.
- FIG. 6 is a diagram showing the flow of a transmission frame when transmission of the transmission frame containing actual data is started.
- the transmission frame a 1 in Fig. 5 is transmitted counterclockwise between each node.
- the first node 5 when the first node 5 starts transmitting a transmission frame including an actual data to the third node 15, the first node 5 receives the transmission frame.
- Check that the node you are using is a transmission frame a 1. More specifically, in the first node 5, the transmission start indicator and the transmission end indicator of the transmission frame are 0, and there is no in-transit indicator. Check that it is in the state.
- the first node 5 rewrites the transmission frame a 1 to the transmission start frame a 2, and transmits the second node 5 via the transmission frame processing unit 310 and the transmission unit 330.
- transmission start frame a 2 starts transmission frame transmission from the first node 5 to the third node 15 for each node. It is a frame for notifying that you are about to take action. Therefore, the transmission start indicator of the transmission start frame a2 is 1, the transmission address is 1, and the reception address is 3.
- the transmission start frame a 2 passes through the second node 10, the third node 15, the fourth node 20, the fifth node 25 and the sixth node 30. Then go back to the first node 5. During this time, the 2nd node 10 0 to the 6th node 3 0 are your own table.
- the first node 5 that received the transmission start frame a 2 is the first node of the communication node of the band setting table stored in the table record of its own machine 3 ⁇ 4 ⁇ ⁇ 3 2 0 Circle the node 5 and the third node 5 of the receiving node. Thus, each node recognizes that node 1 is trying to transmit a frame that contains the actual data on node 3 and node 5.
- the first node 5 starts transmission of a transmission frame a 3 () (X is a natural number) including actual data. More specifically, the first node 5 writes the actual data D (X) in the transmission frame practical condition output from the sixth node 30. Also, add 1 to the signal during transmission and output to the second node 10. In addition, in the header area 1101 of the relevant transmission frame a 3 (X), it is written that this is a transmission frame to be added to the third node 15 It is done.
- the second node 1 0 receives the output transmission frame a 3 (X).
- the second node 10 has received the transmission start frame a 2 and recognizes that the transmission frame a 3 (X) is not sent by itself. As such, output to the 3rd node F 1 5 as it is.
- the third option 1 5 has received the transmission start frame a 2 and is the transmission frame from which the obtained transmission frame a 3 (X) has been transmitted to the own device. And ⁇ Shinobu can be Bi. Then, the third node 1 5 is the one of the transmission frame a 3 (). It reads out the real part 2 1 0 contained in the stream area 1 1 0 2 and outputs it to the terminal in the 3rd node 1 5. As a result, the terminal in node 3 15 can obtain the actual data.
- the third node 1 5 outputs the transmission frame a 3 (X) to the fourth node 2 0.
- the 4th node 20 0 to the 6th node 3 0 Since the transmission frame a 3 (X) is not transmitted to the own machine, the transmission frame a 3 (X) is transmitted to the next node as well as the second node 10 above. Output directly to the As a result, the transmission frame a 3 (X) goes around the transmission system and returns to the first node 5.
- the first node 5 determines whether or not to end transmission of the transmission data. More specifically, node 1 determines whether or not it has been included in all real-world transmission data.
- the first node 5 transmits the next actual data to the transmission data, and the second node 5 Since the operation performed by the second node 10 to the sixth node 30 is the same as the above operation, the explanation will be omitted. Note that the first node 5 will continue to output and output actual transmission data until it is written and transmitted to all transmission data 1 & data.
- the first node 5 rewrites the obtained transmission schedule to the transmission end frame a 4.
- transmission end frame a 4 ends transmission of a transmission frame including actual data for the first node 5 to the third node 15 for each node. Please do It is a frame to notify. Therefore, the first node 5 sets the transmission indicator of the acquired transmission frame and the transmission indicator to 0, sets the transmission end indicator to 1, and sends it. Set the address to 1 and set the receive address to 3. Then, the first node 5 outputs the transmission end frame a 4 to the second node 1 0.
- the transmission end frame a 4 is the second node 10, the third node 15, the fourth node 20, the fifth node 25 and the sixth node 30. You will get back to the first node 5 via During this time, the second node 10 to the sixth node 30 correspond to the first node of the transmitting node of the bandwidth setting table stored in the table storage unit 320 of the own machine. Remove the circle in the field of the 5th node and the 3rd node 1 5 of the receiving node.
- the first node 5 having received the transmission start frame a 2 is the first node of the transmission node of the band setting table stored in the table storage unit 320 of its own device. Delete the circle in the field of node 5 and the third node 1 5 of the receiver node. In this way, each node recognizes that the transmission frame has been transmitted from the first node 5 to the third node 1 5. This completes the transmission of the transmission frame from the first node 5 power to the third node 1 5.
- Fig. 8 is a flowchart showing the operation performed by the first node 5 transmitter / receiver 300 at this time. It is. Figure 9 shows the transmitter and receiver of this other node.
- the band setting processing unit 315 has a transmission start index of 1 and a transmission end index of 0, and in the other part in the scan area 1 1 0 2
- a band setting area 2 0 5 is created by using the value in the stream area 1 1 0 2 of the frame received from No. 6 node and transmitted.
- the transmission frame processing unit 3 10 0 creates the transmission start frame a 2 using the band setting area 2 0 5 that has been output (step S 5), and the transmission unit 3 Output to 0.
- the transmitter unit 330 outputs the fe transmission start frame 2 that has been output to the second node 10 (step S 10).
- the transmission start frame a 2 is in the transmission system.
- the receiver unit 305 of the first node 5 receives the transmission start frame a 2 (step S 15).
- the transmission frame processing unit 3 1 0 separates the band setting area 2 0 5 of the 13 ⁇ 4 transmission start frame a 2 received by the receiving unit 3 0 5, and outputs it to the band setting processing unit 3 1 5. .
- the band setting processor 35 updates the band setting table to the state of ⁇ circle around (1) ⁇ based on the band setting area 205 (step S 20). More specifically, the band setting processing unit 315 is configured to receive the first node of the transmitting node of the band setting table stored in the table storage unit 320, 5 And the third node 1 5 of the receiving node with a circle Next, the transmitting / receiving apparatus 300 starts transmitting a transmission frame containing actual data (step S 25). More specifically, the transmission frame processing unit 3 1 0 acquires the first actual data to be transmitted from the actual data processing unit, and further, the bandwidth setting area 2 0 5 from the bandwidth setting processing unit 3 0 5 Get a transmission frame a 3
- the transmitting unit 330 transmits the transmission frame a 3 (1).
- the transmitting / receiving apparatus 300 transmits a transmission frame a 3 (X) (X is a natural number) including the next actual value (step S 30).
- the transmitting / receiving device 300 which has transmitted the transmission frame a 3 (X) is a transmission in which the transmission frame a 3 (X) transmitted in the transmission frame processing section 3 1 0 contains the last actual data.
- the processing of step S3 10 is determined by whether or not the data length part 2 4 0 of the transmission frame a 2 matches the length of the actual data set that has already been sent. . If it is the last real data, the process proceeds to step S40. On the other hand, if it is not the last actual data, the process returns to step S30.
- the transmission frame processing unit 310 creates a transmission end frame a 4 (step S 40). More specifically, the transmission frame processing unit 3.10 causes the bandwidth setting processing unit 3 1 5 to create the bandwidth setting area 2 0 5, and uses the bandwidth setting area 2 0 5 to perform the transmission end frequency transfer. Create a 4 a. Next, the transmission frame processing unit 3 1 0 causes the transmission unit 3 3 0 to transmit the transmission end frame a 4.
- Step S 4 5 After this, as shown in Figure 7, The transmission end frame a 4 goes around the data transmission system. Then, the receiver unit 305 of the first node 5 receives the transmission end frame a 4 (step S 50).
- the transmission frame processing unit 3 1 0 separates the bandwidth setting area 2 0 5 of the end frame a 4 received by the reception unit 3 0 5 and outputs it to the bandwidth setting processing unit 3 1 5.
- the band setting processor 35 updates the band setting table to a new state based on the band setting area 205 (step S 55). More specifically, the band setting processing unit 3 15 is the first node 5 of the transmission side of the band setting table stored in the table storage unit 3 20, and 5 Delete the circle attached to the field of 3rd node 1 5 of the receiving node.
- the receiver 0 0 receives the transmission start frame a 2 transmitted from the first node 5 car (step S 105), and the transmission start frame a 2 Is output to transmission frame processing unit 3 1 0.
- the transmission frame processing unit 3 1 0 is the transmission start frame a.
- the band setting area 2 0 5 is read from 2 and output to the band setting processing unit 3 1 5.
- the band setting processor 315 having acquired the area setting area 205 updates the band setting table based on the band setting area 205 (step S 1 1 0). More specifically, in the band setting processing unit 315, the transmission start index of the band setting area 205 is 1 and the transmission address is 1 and the reception address is further received. Make sure that the number 3 is on the dress. Then, the bandwidth setting processing unit 315 acquires the bandwidth setting table from the table storage unit 320, and the first node 5 and the receiving node of the transmission side node of the bandwidth setting table are obtained. Circle the 3rd node 1 and 5 of the field. In this way, the node recognizes that transmission frame transmission to node 1 5 to node 3 5 has started. After this, the transmission frame processing unit 310 causes the transmission unit 330 to transmit the transmission start frame a 2 (step S 1 15).
- the receiver unit 305 receives the transmission frame a 3 (X) transmitted from the first node 5 (step S 120) and performs transmission frame processing. Output to section 3 1 0.
- the transmission frame processing unit 310 has received the transmission start frame a 2, and the transmission frame a 3 (x) contains the actual data transmitted to the own device. It recognizes whether it is a frame or not. Therefore, the transmission frame 3 10 0 determines whether the transmission frame a 3 (X) is the transmission frame transmitted to the own machine (step S 1 2). Five ) . If it is a transmission frame transmitted to the own machine, the process proceeds to step S130. On the other hand, when it is not the transmission frame transmitted to the own machine, the process proceeds to step S135.
- the transmission frame processing unit 3 1 0 If it is a transmission frame transmitted to the own machine, the transmission frame processing unit 3 1 0 reads the real time section 2 1 0 from the transmission frame a 3 (X), and Output to the actual data processing unit 3 2 5. As a result, the actual data processing unit 3 Get 2 1 0 After this, the actual data processing unit 3 2 5 outputs the actual data to the terminal of the aircraft.
- the transmission frame processing unit 310 determines whether or not the transmission end frame a 4 has been acquired (step S 140). If the transmission frame processing unit 3 1 0 obtains the transmission end frame a 4, the process proceeds to step S 1 4 5. On the other hand, when the transmission frame processing unit 3 1 0 has not acquired the transmission end frame a 4, the process returns to step S 1 2 0.
- the transmission frame processing unit 3 1 0 causes the bandwidth setting processing unit 3 1 5 to update the bandwidth setting table (step S 1 4 5). ). More specifically, the band setting processing unit 315 is configured to transmit the first node 5 of the transmitting node of the band setting table and the third node 15 of the receiving node. Delete the circle attached to the column. As a result, each node confirms that the communication between the first node 5 and the third node 15 has ended. This completes the explanation of the operations performed by nodes other than node 1 node 3 0 0 3.
- the fourth node 20 starts Refer to the drawings for the processing performed by the data processing system according to this embodiment when transmission frames containing actual data are transmitted between node 6 and node 30.
- the fourth node 20 starts transmitting the transmission frame including the actual data to the fifth node 25.
- FIG. Figure 10 shows the values of the fields in the stream area 1 102 of the transmission frame.
- Figures 1 1 and 12 show that node 1 node 5 transmits the transmission frame containing actual data to node 3 node 5; This figure shows the flow of the transmission frame when 20 starts transmitting a transmission frame containing actual data to the fifth node 25.
- the transmission frame b l () reaches the third node 15 via the second node 10.
- the third node 15 reads out the actual data part 210 from the transmission frame bl (X) to obtain actual data, and transmits the transmission frame bl (X) to the fourth frame. Output 2-0. Accordingly, the fourth node 20 obtains the transmission frame b l (X).
- the fourth node 20 rewrites one of the acquired transmission frames bl (X) into the transmission start frame b 2 and outputs it to the first node 5 .
- transmission frame b 1 (i) is rewritten to transmission start frame b 2.
- the transmission start frame b 2 is that node 4 20 is about to start transmission frame transmission to node 5 5.
- the transmission start index of 2 is 1; the transmit address is 4; and the receive address is 5.
- the transmission start frame b 2 and the transmission frames after the transmission frame b 1 (i + 1) are transmitted through the fifth node 25 and the sixth node 30.
- 1 Node 5 is reached.
- each node is trying to transmit a transmission frame including the actual data on the fourth node 20 to the fifth node 25 in the band setting table. Record the course.
- the first node 5, the fifth node 25 and the sixth node 30 have the same effect as the fourth node 20 against the fifth node 25. It recognizes sending a transmission frame containing data.
- the first node 5 rewrites the acquired transmission start frame b 2 into a transmission start frame b 3 (j) including the actual data to be transmitted next, as well as the transmission frame b Rewrite transmission frames after 1 (i + 1) to transmission frames after transmission frame b (j + 1).
- the transmission start frame b 3 (j) including the actual data will be described.
- the transmission start frame is a frame for notifying that transmission of the transmission frame is started. Therefore, the transmission start frame does not include actual data. If the transmission start frame b 2 does not go around in the data fe system, as shown in FIG. 11, the second node 10 and the third node Node 15 recognizes that node 4 20 is trying to transmit a transmission frame containing actual data to node 5 5. On the other hand, the first node 5 must transmit a transmission frame containing the actual data to the third node 15.
- the first node 5 sets the transmission start indicator of the transmission start frame b 2 to 1 and adds actual data to be transmitted to the third node 1 5 Create a transmission start frame b 3 (j) that includes a schedule.
- the actual data is transmitted from the first node 5 to the third node 1 5, and the second node 10 and the third node 1 5 are transmitted. It is possible to notify to the start of transmission.
- the fourth node 20 tries to transmit a transmission frame containing actual data to the fifth node 25 in the band setting table of the own machine to the fourth node 20. Record the course.
- the fourth node 20 starts transmission frame transmission to the fifth node 25.
- the fifth node 2 5 receives the transmission frame b 4
- the fifth node 25 can obtain the actual data output from the fourth node 20. After this, the fifth node 25 sets the transmission frame b 4 (X) (where x is an integer greater than or equal to 1) output from the fourth node 25 to the sixth node 3 Output to 0.
- the transmission frames bl (k) and the like pass through the second node 10 and reach the third node 1 5.
- the third node 15 reads the actual data from the transmission frame b 1 (k) etc. which has been transmitted, and the transmission frame bl (k) etc.
- Output 2-0 the transmission frame b 1 (k) etc.
- the fourth node 20 rewrites the acquired transmission frame bl (k) etc. into a transmission frame including the actual data to be transmitted to the fifth node 25.
- the first node 5 and the fourth node 20 rewrite the transmission data acquired by each of them into transmission data including the actual data to be output by the own machine and transmit.
- the operations performed in the data transmission system are briefly described.
- the first node 5 rewrites the obtained transmission data to the transmission data including the actual data to be transmitted to the third node 15 and transmits it to the third node 1 5 (first Step).
- the transmission data output from the first node 5 passes through the second node 10 and the actual data is read out by the third node 15 (second step).
- the third node 15 outputs the acquired transmission data to the fourth node 20 (fourth step).
- the fourth node 20 rewrites the acquired transmission data to transmission data including the actual data to be transmitted to the fifth node 25 and outputs it to the fifth node 25 (the fifth node 25).
- Fifth node 2 5 Reads the actual data from the acquired transmission data (7th step).
- the fifth node 2 5 outputs the acquired transmission data to the sixth node 3 0 (eighth step).
- the transmission data output from the 5th node 2 5 passes through the 6th node 30 and is input to the 1st node 5 (9th step).
- the first node 5 is transmitting the transmission data to the third node 15.
- node 4 0 will be able to transmit transmission data to node 5 5.
- Fig. 13 is a flowchart showing the operation performed by the fourth node 20 transmitter / receiver 300 at this time.
- Figure 14 shows the operation of the transmitting and receiving unit 300 of each node while communication between the fourth node 20 and the fifth node 25 is being performed. It is a lottery.
- the band setting processor 35 determines whether or not the transmission frame can be transmitted to the fifth node 25 (step S205).
- the band setting processing unit 35 refers to the band setting table of the own machine, and the transmission path used by the first node 5 and the third node 15. , 4th node 2 0 and 5th node 2 5 It makes a judgment based on whether or not the transmission path that the driver is using overlaps with the transmission path. Then, when it is possible to transmit a transmission frame, the process proceeds to step S210. On the other hand, if transmission of the transmission frame is not possible, this process ends without transmission frame being transmitted.
- the transmission frame processing unit 3 1 0 creates a transmission start frame b 2 (step S 2 1 0). Specifically, in the process shown in step S 2 10, first, the band setting processing unit 3 1 5 transmits the band setting area of the column of the transmission start frame b 2 shown in FIG. Create 5 and output it to the transmission frame processing unit 3 1 0. The transmission frame processing unit 3 1 0 creates the transmission start frame b 2 using the band setting area 2 0 5
- the transmission frame processing unit 3 1 0 transmits the created transmission start frame b 2 to the 7 & signal unit 3 3 0 (step S 2 1 5).
- the transmission start frame b 2 transmitted from the transmitter section 330 is transmitted through the first transmission system and is rewritten to the transmission start frame b 3 (j) at the first node 5.
- the transmission start frame b 3 (j) is received by the receiver section 305 (step S 220).
- the transmission frame processing unit 3 10 0 executes the real data processing unit 3 0 of the transmission start frame b 3 (j) received by the receiving unit 3 0 5. Output to 2 5 and output the band setting area 2 0 5 to the band setting processing section 3 1 5.
- the band setting processing unit 3 15 changes the band setting table based on the acquired band setting / area 2 0 5 (step S 2 25). More specifically, The band setting processing unit 315 rounds the fourth node 20 of the transmitting node and the fifth node 25 of the receiving node of the band setting table. Thus, the fourth node 20 recognizes that the transmission frame including the actual data is transmitted to the fifth node 25. After this, the 4th node 20 starts transmission of the overhead frame containing the actual data (step S2 3 0). This concludes the explanation of the operation performed by the fourth node 20 transmitter / receiver 300.
- the receiving unit 305 receives a transmission frame including actual data (step S 3 05), and outputs the transmission frame to the transmission frame processing unit 3 10.
- the transmission frame processing unit 310 which has acquired the transmission frame determines whether or not the own machine is transmitting a transmission frame including the actual setting (step S 3 1 0) . If a transmission frame has not been sent, the process proceeds to step S315. If a transmission frame has been sent, the process proceeds to step S320.
- the transmission frame processing unit 310 determines whether the actual data in the transmission frame is the 3 ⁇ 4 frame transmitted to the own device. Determine whether (step S 3 1 5). In addition, the 1st frame processing unit 3 1 0 When the first frame b 2 is received, it is recognized which transmission node including the real artist should be sent to which node. Therefore, the transmission frame processing unit 3 1 0 makes the judgment based on the red of the recognition. If the transmission frame has been transmitted by itself, the process proceeds to step S.
- the transmission frame processing unit 3 1 0 reads out the actual data portion 2 1 0 and the actual processing portion 3 2 Output to 5 (Step S 3 6). After that, the actual data processing unit 3 2 5
- step S 317 the transmission frame processing unit 30 causes the transmission unit 3 30 to output the acquired transmission frame as it is to the next node (step S 3). This completes the process.
- step S 3 10 If it is determined in step S 3 10 that the user is transmitting a transmission frame containing actual data, the transmission frame processing unit 3 10 The content of the acquired transmission frame is rewritten to the transmission frame including the actual data to be output by the machine (step S 3 2 0) 0 Next, the transmission frame processing unit 30 , Retransmission frame transmitted 3 3
- step S 3 2 5 Send 0 to the next node (step S 3 2 5). This process ends here.
- the fourth node 20 0 power to
- each node 3 0 0 carries out the transmission operation, none 3 1
- the transmission end frame b 5 is a transmission frame for notifying each node that transmission of the transmission frame from the first node 5 to the third node 1 5 is completed. It is. Therefore, the end of transmission of the transmission end frame is set to 1, the transmission address is set to 1, the reception address is set to 3, and so on.
- Transmission frame b 1 (m) and transmission end frame b 5 are identical to Transmission frame b 1 (m) and transmission end frame b 5 .
- the third node 15 sends the transmission frame b 1 m) and the transmission end frame b 5 to the fourth node 20.
- the fourth frame 0 takes the obtained transmission frame b 1 (m) and transmission end frame b 5 as transmission frame b 4 (n) and transmission end frame b 6 (n + 1).
- the transmission frame b 4 (n) is a transmission frame including the actual data that the fourth node 20 should send to the fifth node 25.
- transmission end frame b 6 (n + 1) notifies each node that data transmission from node 1 to node 5 has been completed.
- the fourth node 20 contains the actual data to be sent to the fifth node 25.
- the fourth node 20 outputs the rewritten transmission frame b 4 (n) and the transmission frame b 6 (n + 1) to the fifth node 25.
- the fifth node 2 5 reads out the actual data from the transmission frame b 4 (n) and the transmission end frame b 6 (n + 1) and takes it, and the fe transmission end frame b 6 ( Referring to the bandwidth area of n + 1), it is recognized that the first node 5 and the third node 15 have ended. More specifically, node 5, node 5 records in its own band setting table that communication between node 1 5 and node 3 5 has ended. PC orchid 002 bell 74
- the fifth node 25 outputs the transmission frame b 4 (n) and the transmission end frame b 6 (n + 1) to the sixth node 30.
- the transmission frame b 4 (n) output from the fifth node 2 5 and the transmission end frame b 6 (n + 1) pass through the sixth node 30 and the first Reach Node 5.
- the sixth node 30 records the end of the communication between the first node 5 and the third node 15 in its own band setting table.
- the first node 5 selects the transmission frame b 4 (n) of the received transmission frame b 4 (n) and the transmission end frame b 6 (n + 1). Rewrite to a 1 shown in Fig.5. As a result, the communication between the first node 5 and the third node 15 is completely completed. After that, the transmission frames b 4 (n) and a 1 are input to the fourth node 20 via the second node 10 and the third node 15. Thereafter, the state shifts to the normal communication state between the fourth node 20 and the fifth node 25.
- Figure 16 is a flowchart showing the operation of the first node 5 transceiver 300 at this time.
- the transmission frame processing unit 310 determines whether the actual data to be output by the own machine is the last actual data (step S405). The actual data that the aircraft should output is the last actual data If not, the process goes to step S 4 0 7. If the actual data to be output by the aircraft is the last actual data, the process proceeds to step S 4 10.
- the transmission frame processing unit 310 When the actual data to be output by the machine is not the last actual data, the transmission frame processing unit 310 normally writes the actual data to the transmission frame and outputs it to the next node. (Step S 4 0 7).
- the transmission frame processing unit 310 creates a transmission end frame b5 (step S410).
- the transmission end frame b 5 is a transmission frame for notifying each node that the communication between the first node 5 and the third node 15 is completed. is there. Therefore, the end of transmission indicator is set to 1, the transmit address is set to 1, and the receive address is set to 3. .
- the transmission frame processing unit 3 1 0 outputs the created transmission end frame b 5 to the next node (step S 4 1 5).
- the transmission end frame is input to the fourth node 20 via the second node 10 and the third node 15.
- the fourth node 20 rewrites the transmission end frame b 5 to the transmission end frame b 6 (n + 1) and outputs it to the next node.
- the transmission end frame b 6 (n + 1) is input to the first node 5 via the fifth node 25 and the sixth node 30.
- the receiver 305 of the first node 5 receives the transmission end frame b 6 (n + 1) transmitted by the fourth node 20 (step S 4 2 0) Output to the transmission frame processing unit 3 1 0.
- the transmission frame processing unit 3 1 0 updates the band setting table of its own machine based on the band setting area of the transmission end frame b 6 (n + 1) (step S 4 2 5) .
- the transmission frame processing unit 310 is the first node 5 of the transmitting node and the third node of the receiving node of its own band setting table. Remove the circle in field 1-5 By this, the first node 5 recognizes that the communication with the third node 15 of its own device has ended.
- each node refers to its own band setting table and communicates with other nodes when starting communication with other nodes. Determine if you can.
- the transmission frame is not completely transmitted in the data transmission system, it is determined that the two nodes can communicate with each other, and the two nodes are able to communicate with each other.
- the node may start to transmit the transmission frame at the same time.
- transmission paths used by the two nodes overlap, transmission of the two transmission frames is not established. So, in the following, we will describe a data transmission system that prioritizes transmission of either transmission frame in such cases. In the present embodiment, the description will be continued below as giving priority to the transmission of a transmission frame output from a node having a small node number.
- the first node 5 transmits a transmission frame including actual data to the sixth node 30 and the fourth node 20
- the case of transmitting a transmission frame containing actual data on the 5th node 2 5 will be described with reference to the drawings.
- Figure 17 shows the values of the fields in the stream area 1 102 of the transmission frame.
- Figure 18 shows the flow of the transmission frame in this case.
- the first node 5 and the fourth node 20 respectively create transmission start frames c l and c 2 at the same time and output them to the next node.
- the transmission start frame c 1 is transmitting the transmission frame including the actual data to the first node 5 to the sixth node 30. It is a transmission frame to notify each node. Therefore, the transmission start indicator is set to 1, the transmit address is set to 1, and the receive address is set to 6.
- transmission start frame c 2 is to transmit a transmission frame in which the fourth node 20 transmits the actual data to the fifth node 25. It is a transmission frame to notify each node of and. Therefore, the start of transmission indicator is set to 1, the transmit address is set to 4, and the receive address is set to 5.
- the second node 10 and the third node 1 5 start communication between the first node 5 and the sixth node 30 in the band setting table. Record and.
- the fourth node 20 starts from the first node 5 before the transmission start frame c 2 output from the own aircraft makes a round around in the data transmission system. Receives the output transmission start frame c 1. '
- the transmission start frame c 2 output from the fourth node 20 is transmitted to the first node via the fifth node 25 and the sixth node 30. Reach 5 During this time, the fifth node 25 and the sixth node 30 start the communication between the fourth node 20 and the fifth node 25 in the bandwidth setting table. Record
- the first node 5 is the fourth node 20 before the transmission start frame c 1 output from the own machine goes around the data transmission system. Receive the transmission start frame c 2 output.
- both node 1 and node 4 are output from the other node before receiving the transmission start frame output by the own machine together. Receive received transmission start frame.
- the transmission of the smaller node number is prioritized, the first node 5 to the sixth node 30 will be described. Transmission frame transmission is prioritized.
- the transmission stop frame c 3 is the fourth frame. — A transmission frame for stopping transmission of a transmission frame between node 2 0 and node 5 2 5. More specifically, the transmission stop frame c 3 is a transmission frame in which the transmission start indicator and the transmission end indicator are zero. The transmission stop frame c 3 is transmitted from the first node 5 and reaches the fourth node 20. During this time, the second node F 10 45 and the third node 15 do not change the band setting table of their own machine, and the transmission cancellation frame c to the next node Output 3
- the fourth H 2 0 updates the band setting table of its own based on the transmission start frame c 1 transmitted from the first node 5 car, and starts the transmission.
- Output frame c 1 as it is to the fifth node 2 5.
- the transmission start frame c 1 passes through the 5th node 25 and the 6th node 30 and is input to the 1st node 5.
- the band setting table is updated on the fifth node 25 and the sixth node 30.
- the first node 5 that receives the transmission start frame c 1 determines that transmission of the transmission frame to the sixth node F 3 0 is to be started. After this, the first node 5 outputs a transmission frame c 4 () (X is an integer of 1 or more) containing actual data.
- transmission of the transmission frame from the first node 5 is prioritized.
- Fig. 19 shows a flow chart showing the operation of the first node 5 or the fourth node at this time.
- the bandwidth setting processing unit 3 1 5 creates a bandwidth setting area 2 0 5 and outputs it to the 13 ⁇ 4 frame processing unit 3 1 0.
- the band setting processing unit 315 sets the transmission start index to 1 and sets the transmission address to 1 , Set reception address to 6.
- the bandwidth setting processing unit 350 sets the transmission start indicator to 1 and sets the transmission address to 4; Set the reception address to 5.
- the transmission frame processing unit 3 1 0 acquires the acquired bandwidth setting area 2
- step S 5 0 5 Use 0 5 to create a transmission start frame c 1 or c 2 (step S 5 0 5).
- the transmission frame processing unit 310 causes the created transmission start frame c 1 to transmit c 2 to the next node via the transmission unit 330 (step S 5 1 0)
- the receiver unit 305 receives the start frame transmitted from the other node (step S55). More specifically, in the case of the first node 5, the reception unit 305 executes the transmission start frame c 2 output by the fourth node 20. On the other hand, in the case of the fourth node 20, the reception unit 305 receives the transmission start frame c 1 outputted by the first node 5.
- the transmission frame processing unit 3 1 0 outputs only the band setting area 2 0 5 of the acquired transmission start frame to the band setting processing unit 3 1 5.
- the band setting processing unit 3 1 5 obtains the band setting ⁇ vM. Area 2 0 5.
- the bandwidth setting processing unit 3 The 1 5 refers to the 1S address and determines whether the transmission address number is greater than the node number of the own machine (step S 5 2 0) transmission code If the number of the lesser is not larger than the number of the node of the own machine, the process proceeds to step S525. If the transmission address number is larger than the own device's node number, the process proceeds to step S540.
- the band setting processing unit 3 15 updates the band setting table based on the band setting area 25 ( Step S 5 2 5).
- the process is a process performed by the band setting processing unit 35 of the fourth node 20. More specifically, the band setting processing unit 315 of the fourth node 20 transmits the transmission frame of the first node 5 to the sixth node 30 in the band setting table. Register that you have started transmitting
- the 13 ⁇ 4 frame processing unit 310 causes the transmitting unit 330 to output the acquired transmission start frame as it is to the next node (step S 530) ).
- the receiver unit 305 receives the transmission stop frame which has been rewritten and transmitted by another node (step S535).
- the node does not start transmission frame transmission, while in step S520, the transmission address of the node is its own node number.
- the transmission frame processing unit 310 creates a transmission cancellation frame (step S 540).
- This processing is an operation performed by the transmission frame processing unit 310 of the first node 5. More specifically, The transmission frame processing unit 310 of the first node 5 is configured to receive the transmission cancellation frame c 3 of FIG. 17 based on the band setting area 250 prepared by the band setting processing unit 315. create . Thereafter, the transmission frame processing unit 310 causes the transmission unit 330 to output the created transmission cancellation frame c 3 to the next node (step S 5 45).
- the reception unit 305 receives the transmission start frame transmitted by the own device (step S 550), and outputs the frame to the transmission frame processing unit 3 10.
- the transmission frame processing unit 3 1 0 separates the band setting area 2 0 5 of the acquired transmission start frame, and outputs it to the band setting processing unit 3 1 5.
- the band setting processing unit 3 15 updates the band setting table based on the band setting area 2 0 5 (step S 5 5). More specifically, the band setting processing unit 315 registers in the band setting table that the first node 5 starts transmission frame transmission to the sixth node 30. You Thereafter, the transmission frame processing unit 310 starts transmission of the transmission frame containing the actual data (step S560). This concludes the explanation of the operation of the first node 5 or the fourth node 20.
- a band setting area is provided in a part of the transmission frame stream area, and the data transmission system is provided in the band setting area. Since the communication status in the system is written, each node can recognize the transmission status in the data transmission system. As a result, when trying to start transmission to other nodes, each node checks whether the transmission line overlaps with the other transmissions. You will be able to do it. As a result, multiple transmissions can be performed without overlapping transmission paths, and effective utilization of transmission path bandwidth can be achieved.
- the stream area is made up of the band setting area 101 and the actual data section 116.
- the stream area is not limited to this.
- the configuration of the area is not limited to this.
- a part of the stream area is assigned to a specific transmission, for example, the transmission of audio data from a CD recorder to an amplifier, and the remaining area is shown in this embodiment. It may be used in a different way.
- each node refers to the band setting area 205 of the received transmission frame.
- all nodes must be in the band area 250 You do not have to refer to For example, only the node that transmits transmission frames can
- the data length is assumed to be known to the receiver at the start of transmission, but the notification of the length of 3 days is not limited to this.
- the data length in each transmission frame is written to the head part, and each node on the receiving side refers to the head part each time to retrieve the necessary data. Thank you.
- the receiving node receives the transmission frame, acquires the actual data, and then rewrites the transmission frame without changing the next node. It is being sent to the Here, since the actual data part is not necessary for the next node, it is possible to delete the invalid data in the actual data part by erasing the receiving node. OK.
- the contention control method may be a method in which the priority relationship of nodes is determined in advance, or a method in which the nodes are prioritized based on the last transmission time. You may use the method of
- the number of transmission frames that can be used continuously is not particularly limited in this embodiment, a particular node does not occupy transmission frames for a long time. Thus, an upper limit may be placed on the number of transmission frames that can be used continuously.
- each node In the present embodiment, no particular mention is made of the nature of each node, but the arrangement is such that the two nodes that transmit frequently are located close to their physical positions. This can further improve the bandwidth utilization efficiency.
- one node may simultaneously transmit data and receive data. You may as well.
- the node on the transmitting side and the node on the receiving side are in a one-to-one data transmission line, one transmitting side node can simultaneously transmit data to a plurality of receiving sides. You may send data to the node.
- a plurality of reception address units 2 3 0 are provided in the band H X At 2 0 5. Then, if there are multiple receiving address units 230, each node uses the receiving node at the position farthest from the transmitting node, if there are multiple receiving address parts. It is recognized that it is a transmission route.
- one sender node sends data to multiple receiver nodes at the same time, is it possible that multiple receiver nodes will always be sender nodes?
- the same schedule may be received. For example, in this case, it may be considered that two speeds always receive one de- duction sent by one amplifier. If there is a speed limit on the reception address like this, it will be closer to the amplifier if it is written on the reception address. It is possible for SPIC to acquire this evening, judging that it is the evening addressed to the aircraft. By this setting, the number of transmission address reception address parts can be reduced.
- each node is connected by an optical transmission line, but it must be connected by an optical transmission line. It is not good. More specifically, each of the nodes may be connected by a wire that transmits an electrical signal ⁇ ".
Abstract
Description
Claims
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
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JP2004536357A JPWO2004057804A1 (ja) | 2002-12-19 | 2002-12-19 | データ伝送システム、データ伝送方法およびデータ伝送装置 |
EP02786150A EP1575220A1 (en) | 2002-12-19 | 2002-12-19 | Data transmission system, data transmission method, and data transmission apparatus |
AU2002354235A AU2002354235A1 (en) | 2002-12-19 | 2002-12-19 | Data transmission system, data transmission method, and data transmission apparatus |
PCT/JP2002/013274 WO2004057804A1 (ja) | 2002-12-19 | 2002-12-19 | データ伝送システム、データ伝送方法およびデータ伝送装置 |
US10/483,807 US20040213236A1 (en) | 2002-12-19 | 2002-12-19 | Data transmission system, data transmission method, and data transmission aparatus |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
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PCT/JP2002/013274 WO2004057804A1 (ja) | 2002-12-19 | 2002-12-19 | データ伝送システム、データ伝送方法およびデータ伝送装置 |
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WO2004057804A1 true WO2004057804A1 (ja) | 2004-07-08 |
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PCT/JP2002/013274 WO2004057804A1 (ja) | 2002-12-19 | 2002-12-19 | データ伝送システム、データ伝送方法およびデータ伝送装置 |
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US (1) | US20040213236A1 (ja) |
EP (1) | EP1575220A1 (ja) |
JP (1) | JPWO2004057804A1 (ja) |
AU (1) | AU2002354235A1 (ja) |
WO (1) | WO2004057804A1 (ja) |
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US8233800B2 (en) * | 2003-06-26 | 2012-07-31 | Fujitsu Limited | Method and system for upgrading a fiber optics network |
US20050027876A1 (en) * | 2003-07-29 | 2005-02-03 | Toshitomo Umei | Data transmission method, data transmission system, and data transmission apparatus |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH06104908A (ja) * | 1992-09-18 | 1994-04-15 | Matsushita Electric Ind Co Ltd | 分散制御型帯域管理通信方法 |
EP0892573A2 (en) * | 1997-06-16 | 1999-01-20 | Yazaki Corporation | Communication method and communication system |
JP2000078172A (ja) * | 1998-09-01 | 2000-03-14 | Matsushita Electric Ind Co Ltd | 伝送システムおよび送信装置 |
Family Cites Families (3)
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US5181202A (en) * | 1991-02-06 | 1993-01-19 | Fmc Corporation | Ring bus station having dual oscillators |
JP2001168874A (ja) * | 1999-12-08 | 2001-06-22 | Nec Corp | Atmリングネットワークシステム及びそれに用いる一斉同報制御方式 |
DE10063126A1 (de) * | 2000-12-18 | 2002-07-11 | Harman Becker Automotive Sys | Verfahren zur Datenübertragung |
-
2002
- 2002-12-19 US US10/483,807 patent/US20040213236A1/en not_active Abandoned
- 2002-12-19 EP EP02786150A patent/EP1575220A1/en not_active Withdrawn
- 2002-12-19 WO PCT/JP2002/013274 patent/WO2004057804A1/ja active Application Filing
- 2002-12-19 JP JP2004536357A patent/JPWO2004057804A1/ja not_active Ceased
- 2002-12-19 AU AU2002354235A patent/AU2002354235A1/en not_active Abandoned
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH06104908A (ja) * | 1992-09-18 | 1994-04-15 | Matsushita Electric Ind Co Ltd | 分散制御型帯域管理通信方法 |
EP0892573A2 (en) * | 1997-06-16 | 1999-01-20 | Yazaki Corporation | Communication method and communication system |
JP2000078172A (ja) * | 1998-09-01 | 2000-03-14 | Matsushita Electric Ind Co Ltd | 伝送システムおよび送信装置 |
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EP1575220A1 (en) | 2005-09-14 |
US20040213236A1 (en) | 2004-10-28 |
AU2002354235A1 (en) | 2004-07-14 |
JPWO2004057804A1 (ja) | 2006-04-27 |
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