WO2023276122A1

WO2023276122A1 - Redundant transmission device, redundant reception device, redundant transmission method, redundant reception method, redundant transmission program, and redundant reception program

Info

Publication number: WO2023276122A1
Application number: PCT/JP2021/025006
Authority: WO
Inventors: 稔久藤原; 聖成川; 央也小野
Original assignee: 日本電信電話株式会社
Priority date: 2021-07-01
Filing date: 2021-07-01
Publication date: 2023-01-05
Also published as: JPWO2023276122A1

Abstract

In a redundant transmission device 2 disclosed herein, after a low-delay path L transitions from a disconnection state to a communication state, data, estimated as being unreceived by a redundant reception device 3, among data output via a high-delay path H when the low-delay path L is in the disconnection state is re-output via the low-delay path L, and the data input order in the redundant transmission device 2 and the data output order in the redundant reception device 3 are prevented from being exchanged. In the redundant reception device 3 disclosed herein, after the low-delay path L transitions from the disconnection state to the communication state, duplicate data of the data output via the low-delay path L in the communication state of the low-delay path L among the data output via the high-delay path H when the low-delay path L is in the disconnection state is discarded, and the data input order in the redundant transmission device 2 and the data output order in the redundant reception device 3 are prevented from being exchanged.

Description

Redundant transmitting device, redundant receiving device, redundant transmitting method, redundant receiving method, redundant transmitting program and redundant receiving program

The present disclosure relates to redundant communication technology between a transmitting device and a receiving device.

Redundant communication technology between a transmitting device and a receiving device is disclosed in Patent Document 1 and the like. In Patent Document 1, in order to increase the reliability and speed of redundant communication, communication paths are integrated or switched so that multiple paths between a transmitter and a receiver are logically integrated into one communication path.

　Fig. 1 shows the communication procedure of the first redundant communication system of the prior art. In an act-act redundant communication system such as 1+1 redundancy, the branching unit 22 receives data from the transmitting device 1, copies only two copies, and outputs the data to two act paths, and the collecting unit 33 collects the data. Input from two act paths, adopt only one, and output to the receiver 4 . Here, even if one act path is in a disconnected state, if the other act path is in a connected state, even if the branching unit 22 outputs data to the two act paths, the aggregation unit 33 does not can be input from one act path. Therefore, the reliability and speed of redundant communication can be improved.

　Fig. 2 shows the communication procedure of the second redundant communication system of the prior art. In an act-standby redundant communication system such as LAG, the branching unit 22 inputs data from the transmitting device 1 and outputs it to one act path, and the collecting unit 33 inputs data from one act path. , to the receiver 4 . Here, even if the act path is disconnected, if the standby path is in the switching state, the branching unit 22 outputs the data to one standby path. Can be input from route. Therefore, the reliability and speed of redundant communication can be improved.

Patent No. 6839115

In Patent Document 1, the reliability and speed of redundant communication can be improved if the delay amount is the same or small for multiple paths between the transmitting device and the receiving device. However, if the delay amounts are not the same for a plurality of paths between the transmitting device and the receiving device and the delay difference is large, the reliability and speed of redundant communication cannot be improved. For example, as a specific example of the latter, multiple paths between a transmitter and a receiver may use communication media having significantly different propagation velocities (speed of sound << speed of light) and/or physical path lengths.

Fig. 3 shows the communication procedure of the first redundant communication system to be solved. In an act-act redundant communication system such as 1+1 redundancy, one act path is a low-delay path but is temporarily disconnected, and the other act path is a high-delay path but is always open. . Note that the data number and the number of data are for convenience of description, and are not actually limited to this.

The branching unit 22 selects the data No. 1 to No. 13 is input from the transmitter 1 . In the low-delay path, the branching unit 22 outputs data No. 1 to No. 3 is input, the communication state is established, and the branching unit 22 outputs data No. 3. 4 to No. 9 is input, the state is disconnected, and the branching unit 22 outputs data No. 9. 10 to No. At the time when 13 is input, it is in a communication state.

The branching unit 22 selects the data No. 1 to No. 3 to the low-delay path and the high-delay path, and data No. 4 to No. 9 to the high delay path and data No. 10 to No. 13 to the low and high delay paths. The gathering unit 33 collects the data No. 1 to No. 3 from the low-delay path and the high-delay path, and data No. 4 to No. 9 is input from the high delay path and data No. 10 to No. 13 are input from the low-delay path and the high-delay path.

The aggregation unit 33 collects the data No. input from the low-delay path. 1 to No. 3, No. 10 to No. 13, and the data No. 1 input from the high delay path. 1 to No. 3, No. 10 to No. 13 is discarded. However, the aggregation unit 33 receives data No. 1 input from the low-delay path. 10 to No. 13 and data No. 13 input from the high delay path. 7 to No. 9 and cannot handle permutation of the input order. Therefore, the gathering unit 33 selects the data No. 1, No. 2, No. 3, No. 4, No. 5, No. 6, No. 10, No. 7, No. 11, No. 8, No. 12, No. 9, No. 13 is output to the receiving device 4 in the order.

As a result, the receiving device 4 receives the data No. input from the low-delay path. 7 to No. 9 is uselessly discarded, or data No. 9 after receiving data No. 10 to No. 13 will be used late, and the reliability and speed of redundant communication cannot be improved.

Fig. 4 shows the communication procedure of the second redundant communication system to be solved. In an act-standby system redundant communication system such as LAG, the act path is a low-delay path but is temporarily disconnected, and the standby system is a high-delay path but is always in a connected state. Note that the data number and the number of data are for convenience of description, and are not actually limited to this.

The branching unit 22 selects the data No. 1 to No. 3 is preferentially output to the low-delay path, and data No. 4 to No. 9 to the high delay path as an alternative, and data No. 10 to No. 13 are preferentially output to the low delay path. The gathering unit 33 collects the data No. 1 to No. 3 is preferentially input from the low-delay path, and data No. 4 to No. 9 is input from the high delay path as an alternative and data No. 10 to No. 13 are preferentially input from the low delay path.

The aggregation unit 33 preferentially selects the data No. 1 input from the low-delay path. 1 to No. 3, No. 10 to No. 13, and as an alternative data No. 1 input from the high delay path. 4 to No. 9 is also adopted. However, the aggregation unit 33 receives data No. 1 input from the low-delay path. 10 to No. 13 and data No. 13 input from the high delay path. 7 to No. 9 and cannot handle permutation of the input order. Therefore, the gathering unit 33 selects the data No. 1, No. 2, No. 3, No. 4, No. 5, No. 6, No. 10, No. 7, No. 11, No. 8, No. 12, No. 9, No. 13 is output to the receiving device 4 in the order.

Therefore, in order to solve the above-mentioned problems, the present disclosure provides a redundant communication technique between a transmitting device and a receiving device, in which the delay amount is not the same for multiple paths between the transmitting device and the receiving device. The purpose is to increase the reliability and speed of redundant communication even when is large.

In order to solve the above-mentioned problem, in the redundant transmission device, after the transition from the disconnected state of the low-delay path to the connected state, out of the data output to the high-delay path in the disconnected state of the low-delay path, Re-output the data presumed to be received to the low-delay path.

Specifically, the present disclosure includes a low-delay transmission unit that outputs data to a low-delay path, a high-delay transmission unit that outputs data to a high-delay path, and a transmission unit that outputs data to the low-delay transmission unit and/or the a branching unit for outputting to a high-delay transmission unit, wherein the branching unit outputs the low-delay path in the disconnected state of the low-delay path after transition from the disconnected state of the low-delay path to the connected state. Out of the data output to the high-delay transmission unit, the data estimated to have not been received by the redundant receiver is re-output to the low-delay transmission unit, and the order of data input to the redundant transmitter and the redundant reception. This redundant transmission device is characterized by preventing the switching of the data output order in the device.

Further, the present disclosure includes a low-delay transmission step of outputting data to a low-delay path, a high-delay transmission step of outputting data to a high-delay path, and a a step of outputting to a step, wherein the branching step performs the high-delay transmission in the disconnected state of the low-delay path after transition from the disconnected state of the low-delay path to the connected state. Among the data output to the step, the data estimated to have not been received by the redundant reception method is re-output to the low-delay transmission step, and the input order of the data in the redundant transmission method and the redundant reception method. This is a redundant transmission method characterized by preventing a change in the output order of data.

Further, the present disclosure includes a low-delay transmission step of outputting data to a low-delay path, a high-delay transmission step of outputting data to a high-delay path, and a and a branching step for outputting to a step, wherein the branching step, after transition from the disconnected state of the low-delay path to the connected state, outputs to the disconnected state of the low-delay path. out of the data output to the high-delay transmission step, the data estimated to have not been received by the redundant receiver is re-output to the low-delay transmission step, and the order of data input to the redundant transmitter and the redundancy This redundant transmission program is characterized by preventing a data output order from being changed in a receiving device.

According to these configurations, it is possible to prevent the data input order in the redundant transmitting device and the data output order in the redundant receiving device from being switched. Therefore, in the redundant communication technology between the transmitter and the receiver, even when the delay amount is not the same and the delay difference is large for multiple paths between the transmitter and the receiver, the reliability and speed of the redundant communication can increase

Further, according to the present disclosure, the branch unit performs the redundant reception based on the delay amount of the high delay path or based on the delay difference between the delay amount of the high delay path and the delay amount of the low delay path. The redundant transmission device is characterized by selecting data estimated to have not been received by the device and then re-outputting the selected data to the low-delay transmission unit.

According to this configuration, out of the data output to the high-delay path when the low-delay path is disconnected, all data may be re-output to the low-delay path according to the delay difference between the high-delay path and the low-delay path. Therefore, the data estimated to have not been received by the redundant receiver can be re-output to the low-delay path.

In order to solve the above-mentioned problem, in the redundant receiver, after the low-delay path is switched from the disconnected state to the connected state, among the data output to the high-delay path in the disconnected state of the low-delay path, Data that overlaps with data output to the low-delay path in the communication state is discarded.

Specifically, the present disclosure includes a low-delay receiving unit that inputs data from a low-delay path, a high-delay receiving unit that inputs data from a high-delay path, and a low-delay receiving unit and/or the high-delay receiving unit that receives data. and a redundant receiver receiving input from the receiver, wherein the redundant receiver corresponds to the redundant transmitter described above, and the redundant receiver changes from the disconnected state of the low-delay path to the connected state. after the transition to , among the data output to the high-delay path in the disconnected state of the low-delay path, discard data that duplicates data output to the low-delay path in the open state of the low-delay path. and prevents the data input order in the redundant transmitter and the data output order in the redundant receiver from being exchanged.

Further, the present disclosure includes a low-delay receiving step of inputting data from a low-delay path, a high-delay receiving step of inputting data from a high-delay path, and receiving data from the low-delay receiving step and/or the high-delay receiving step. and a set step of inputting, wherein the redundant receive method corresponds to the redundant transmission method described above, and the set step includes transition from a disconnected state to a connected state of the low-delay path. later discarding, among data output to the high-delay path when the low-delay path is disconnected, data duplicated with data output to the low-delay path when the low-delay path is open; A redundant receiving method is characterized in that the data input order in the redundant transmission method and the data output order in the redundant receiving method are prevented from being exchanged.

Further, the present disclosure includes a low-delay receiving step of inputting data from a low-delay path, a high-delay receiving step of inputting data from a high-delay path, and receiving data from the low-delay receiving step and/or the high-delay receiving step. a redundant receiving program for causing a computer to execute a set step of inputting an input, wherein the redundant receiving program corresponds to the redundant sending program described above, and the set step is performed from the disconnected state of the low-delay path After the transition to the connected state, among the data output to the high-delay path when the low-delay path is disconnected, data overlapping the data output to the low-delay path when the low-delay path is connected. are discarded to prevent the data input order in the redundant transmitting device and the data output order in the redundant receiving device from being exchanged.

Further, according to the present disclosure, the aggregation unit performs the low delay based on the delay amount of the high delay path or based on the delay difference between the delay amount of the high delay path and the delay amount of the low delay path. This redundant receiving device is characterized by selecting and discarding data that duplicates data output to the low-delay path when the path is in a communication state.

According to this configuration, according to the delay difference between the high and low delay paths, instead of discarding all of the data output to the high delay path when the low delay path is disconnected, data that overlaps with the data output to the low-delay path can be discarded.

In this way, in the redundant communication technology between the transmitting device and the receiving device, the present disclosure provides redundancy even when the delay amount is not the same and the delay difference is large for multiple paths between the transmitting device and the receiving device. Communication reliability and speed can be increased.

1 is a diagram showing a communication procedure of a first redundant communication system of prior art; FIG. FIG. 2 is a diagram showing a communication procedure of a second redundant communication system of prior art; It is a figure which shows the communication procedure of the 1st redundant communication system of a problem to be solved. It is a figure which shows the communication procedure of the 2nd redundant communication system of a problem to be solved. FIG. 2 illustrates components of a redundant communication system of the present disclosure; FIG. 4 is a diagram showing processing contents of the first redundant communication system of the present disclosure; FIG. 4 is a diagram showing processing contents of the first redundant communication system of the present disclosure; FIG. 3 is a diagram showing a communication procedure of the first redundant communication system of the present disclosure; FIG. 5 is a diagram showing the processing contents of the second redundant communication system of the present disclosure; FIG. 5 is a diagram showing the processing contents of the second redundant communication system of the present disclosure; FIG. 4 is a diagram showing a communication procedure of a second redundant communication system of the present disclosure; FIG. 3 illustrates the integration of received buffers and transmitted buffers of the present disclosure;

Embodiments of the present disclosure will be described with reference to the accompanying drawings. The embodiments described below are examples of implementing the present disclosure, and the present disclosure is not limited to the following embodiments.

(Overview of Redundant Communication System of Present Disclosure)
The components of the redundant communication system of the present disclosure are shown in FIG. The redundant communication system comprises a transmitter 1 , a redundant transmitter 2 , a redundant receiver 3 and a receiver 4 . The redundant transmission device 2 includes a reception buffer 21, a branching unit 22, a low-delay transmission unit 23, a high-delay transmission unit 24, a transmitted buffer 25, and a communication state detection unit 26. It can be realized by installing a redundant transmission program as shown in the upper part of the above in the computer. The redundant receiver 3 includes a low-delay receiver 31, a high-delay receiver 32, an aggregator 33, a transmission buffer 34, and a communication state detector 35. As shown in the lower part of FIGS. can be realized by installing a redundant receiving program on the computer.

Here, the transmitting device 1 and redundant transmitting device 2/redundant receiving device 3 and receiving device 4 may be installed as separate devices or at different locations. Then, the redundant transmitter 2/redundant receiver 3 can hide the redundant communication path and redundant communication control from the transmitter 1/receiver 4, and the transmitter 1/receiver 4 can perform the conventional transmission. A device/receiving device is available. On the other hand, the transmitting device 1 and redundant transmitting device 2/redundant receiving device 3 and receiving device 4 may be installed as an integral device or at the same location. Then, the redundant transmission device 2/redundant reception device 3 does not hide the redundant communication path and redundant communication control from the transmission device 1/reception device 4, and the transmission device 1/reception device 4 separately performs redundant transmission. It eliminates the need to install device 2/redundant receiver 3. The transmitting device 1 and the receiving device 4 may then be installed as separate devices or at different locations, or as an integrated device or at the same location. Furthermore, the redundant transmitting device 2 and the redundant receiving device 3 may be installed as separate devices or at different locations, or as an integrated device or at the same location.

First, the outline of the redundant transmission device 2 will be explained. The low-delay transmission unit 23 outputs data to the low-delay path L. FIG. The high-delay transmission unit 24 outputs data to the high-delay path H. FIG. The branching unit 22 outputs data to the low-delay transmission unit 23 and/or the high-delay transmission unit 24 . Here, after the transition from the disconnection state to the connection state of the low-delay path L, the branching unit 22 selects the data output to the high-delay transmission unit 24 in the disconnection state of the low-delay path L, The data estimated to be received is re-output to the low-delay transmission unit 23 . Details will be described with reference to FIGS. 6 to 11. FIG. Note that the branching unit 22 outputs data to a plurality of low-delay transmission units 23 and/or a plurality of high-delay transmission units 24, and to a plurality of low-delay paths L and/or a plurality of high-delay paths H. You may

Next, the outline of the redundant receiving device 3 will be explained. The low-delay receiver 31 receives data from the low-delay path L. FIG. The high-delay receiver 32 receives data from the high-delay path H. FIG. The aggregator 33 receives data from the low-delay receiver 31 and/or the high-delay receiver 32 . Here, after the transition of the low-delay path L from the disconnection state to the connection state of the low-delay path L, the aggregation unit 33 determines whether the low-delay path L is connected to the connection state of the low-delay path L among the data output to the high-delay path H in the disconnection state of the low-delay path L. discard the data that duplicates the data output to the low-delay path L in the state. Details will be described with reference to FIGS. 6 to 11. FIG. The aggregation unit 33 inputs data from the plurality of low-delay paths L and/or the plurality of high-delay paths H, and from the plurality of low-delay reception units 31 and/or the plurality of high-delay reception units 32. good too.

Therefore, it is possible to prevent the data input order in the redundant transmitting device 2 and the data output order in the redundant receiving device 3 from being changed. In the redundant communication technology between the transmitting device 1 and the receiving device 4, even when the delay amount is not the same and the delay difference is large for a plurality of paths between the transmitting device 1 and the receiving device 4, redundant communication is possible. Reliability and speed can be increased. For example, for underwater communication between the transmitting device 1 and the receiving device 4, high-delay, low-speed, high reachability, and high availability acoustic wave communication, and low delay, high-speed, low reachability, and low availability optical wireless communication When using , it is possible to take advantage of the respective advantages of acoustic wave communication and optical wireless communication.

Here, the branching unit 22 needs to acquire information about the communication status and delay amount of the low-delay path L and the high-delay path H. Therefore, the communication state detection unit 26 performs the following control on the low-delay transmission unit 23 and the high-delay transmission unit 24, and then provides the branching unit 22 with the above information.

The low-delay transmission unit 23/high-delay transmission unit 24 periodically or irregularly transmits communication confirmation data to the low-delay reception unit 31/high-delay reception unit 32. Then, when notified by the low-delay receiving unit 31/high-delay receiving unit 32 that the communication confirmation data has been received within the predetermined time, the low-delay transmitting unit 23/high-delay transmitting unit 24 receives the low-delay receiving unit 31/high-delay receiving unit 32. The communication state of the delay path L/high delay path H is determined. On the other hand, when the low-delay transmitting unit 23/high-delay transmitting unit 24 is not notified by the low-delay receiving unit 31/high-delay receiving unit 32 that the communication confirmation data has been received within the predetermined time, the low-delay transmitting unit 23/high-delay transmitting unit A disconnection state of the delay path L/high delay path H is determined.

The low-delay transmission unit 23/high-delay transmission unit 24 periodically or irregularly transmits delay amount confirmation data to the low-delay reception unit 31/high-delay reception unit 32. Then, the low-delay receiving unit 31/high-delay receiving unit 32 transmits the delay amount response data to the low-delay transmitting unit 23/high-delay transmitting unit 24 immediately after the reception. Further, the low-delay transmission unit 23/high-delay transmission unit 24 transmits 1/2 (one-way) of the difference (round trip) between the transmission time of the delay amount confirmation data and the reception time of the delay amount response data. ) is determined as the delay amount of the low-delay path L/high-delay path H.

The low-delay transmission unit 23/high-delay transmission unit 24 transmits the same data as a substitute signal or an additional signal for the communication confirmation data to the low-delay reception unit 31/high-delay reception unit 32. good too. Then, redundant communication becomes possible by utilizing the momentary communication state.

On the other hand, the aggregation unit 33 also needs to acquire information about the availability and delay amount of the low-delay path L and the high-delay path H. Therefore, the communication state detection unit 35 performs the following control on the low-delay reception unit 31 and the high-delay reception unit 32 and then provides the above information to the aggregation unit 33 .

The low-delay receiving unit 31/high-delay receiving unit 32 periodically or irregularly transmits communication confirmation data to the low-delay transmitting unit 23/high-delay transmitting unit 24. Then, when the low-delay receiving unit 31/high-delay receiving unit 32 is notified by the low-delay transmitting unit 23/high-delay transmitting unit 24 that the communication confirmation data has been received within the predetermined time, the low-delay receiving unit 31/high-delay receiving unit 32 The communication state of the delay path L/high delay path H is determined. On the other hand, when the low-delay receiving unit 31/high-delay receiving unit 32 is not notified from the low-delay transmitting unit 23/high-delay transmitting unit 24 that the communication confirmation data has been received within the predetermined time, A disconnection state of the delay path L/high delay path H is determined.

The low-delay receiving unit 31/high-delay receiving unit 32 periodically or irregularly transmits delay amount confirmation data to the low-delay transmitting unit 23/high-delay transmitting unit 24. Then, the low-delay transmission unit 23/high-delay transmission unit 24 transmits the response data of the delay amount to the low-delay reception unit 31/high-delay reception unit 32 immediately after the reception. Furthermore, the low-delay receiving unit 31/high-delay receiving unit 32 receives 1/2 (one-way) of the difference (round trip) between the transmission time of the delay amount confirmation data and the reception time of the delay amount response data. ) is determined as the delay amount of the low-delay path L/high-delay path H.

Even if the low-delay receiving unit 31/high-delay receiving unit 32 receives the same data from the low-delay transmitting unit 23/high-delay transmitting unit 24 as a substitute signal or an additional signal for the communication confirmation data, good. Then, redundant communication becomes possible by utilizing the momentary communication state.

(Details of the first redundant communication system of the present disclosure)
6 and 7 show processing contents of the first redundant communication system of the present disclosure. A communication procedure of the first redundant communication system of the present disclosure is shown in FIG. In the first redundant communication system (act-standby system such as LAG) of the present disclosure, the act path is a low-delay path L but is temporarily disconnected, and the standby system is a high-delay path H but always Communication status. Note that the data number and the number of data are for convenience of description, and are not actually limited to this.

First, data transmission processing in the redundant transmission device 2 will be described.

　The receiving buffer 21 stores data No. 1 to No. 13 is input from the transmitting device 1 and temporarily held. The branching unit 22 selects the data No. 1 to No. 13 is input from the receive buffer 21 . In the low-delay path L, the branching unit 22 outputs data No. . 1 to No. 3 is input, the communication state is established, and the branching unit 22 outputs data No. 3. 4 to No. 9 is input, the state is disconnected, and the branching unit 22 outputs data No. 9. 10 to No. At the time when 13 is input, it is in a communication state.

Therefore, the branching unit 22 selects the data No. 1 to No. 3 is preferentially output to the low-delay path L (low-delay transmission in the upper stages of FIGS. 6 and 7). Then, the branching unit 22 selects the data No. 4 to No. 9 to the high-delay path H as an alternative (high-delay transmission at the top of FIGS. 6 and 7). Here, the transmitted buffer 25 stores data No. 4 to No. 9 is input from the branch 22 and held temporarily.

Furthermore, after the transition of the low-delay path L from the disconnected state to the connected state, the branching unit 22 outputs the data No. 4 to No. 9, the data No. estimated to have not been received by the redundant receiver 3. 7 to No. 9 is preferentially re-output to the low-delay transmission unit 23 (low-delay transmission in the upper stages of FIGS. 6 and 7). That is, the branching unit 22 selects the data No. 10 to No. 13 is preferentially output to the low delay path L, data No. 4 to No. 6 is preferentially not re-output to the low-delay path L, and data No. 7 to No. 9 is preferentially re-output to the low delay path L. Here, the branching unit 22 selects the data No. 4 to No. 6 is not input from the transmitted buffer 25, and data No. 7 to No. 9 is input from the transmitted buffer 25;

In addition, the branching unit 22 determines whether the redundant receiving device 3 has not received the Data No. estimated to be 7 to No. 9 is selected and re-output to the low-delay transmission unit 23 preferentially. That is, the branching unit 22 outputs data No. 1 to the high-delay path H as an alternative. 4 to No. 6 is preferentially re-output to the low-delay path L after the transition of the low-delay path L from the disconnected state to the connected state. 4 to No. 6, it is determined that the redundant receiver 3 is reached at an earlier time. On the other hand, the branching unit 22 outputs data No. 1 to the high delay path H as an alternative. 7 to No. 9 is preferentially re-output to the low-delay path L after the low-delay path L transitions from the disconnected state to the connected state. 7 to No. 9, it is determined that the redundant receiver 3 is reached at a later time.

Also, the branching unit 22 selects the data No. 1 to No. 13 to which of the low-delay path L and the high-delay path H the data No. 13 is output. 1 to No. 13 as an identifier. Also, the branching unit 22 selects the data No. 1 to No. 13 is input from the receive buffer 21 in the data No. 13. 1 to No. 13 as an identifier. These identifiers are used by the aggregation unit 33 as described later.

In the upper stages of FIGS. 6 and 7 , the branching unit 22 suspends data transmission when the low-delay path L and the high-delay path H are disconnected, and holds the data whose transmission is suspended in the reception buffer 21 . After the low-delay path L or high-delay path H transitions from the disconnected state to the connected state, the branching unit 22 may resume data transmission and read the data whose transmission has been suspended from the reception buffer 21 .

Next, data reception processing in the redundant reception device 3 will be described.

The aggregation unit 33 collects data No. 1 to No. 3 is preferentially input from the low-delay path L (low-delay reception in the lower stages of FIGS. 6 and 7). Then, the gathering unit 33 selects the data No. 4 to No. 9 is input from the high-delay path H as an alternative (high-delay reception at the bottom of FIGS. 6 and 7). Further, the gathering unit 33 collects the data No. 7 to No. 13 is preferentially input from the low-delay path L (low-delay reception in the lower stages of FIGS. 6 and 7).

Here, after the transition of the low-delay path L from the disconnected state to the connected state, the aggregation unit 33 calculates the data No. . 4 to No. 9 output to the low-delay path L while the low-delay path L is in communication. 7 to No. 13 overlapped with data No. 7 to No. Discard 9. That is, the aggregation unit 33 selects the data No. 1 input from the high-delay path H as an alternative. 4 to No. 6, and as an alternative data No. 6 input from the high delay path H. 7 to No. 9 is discarded, and data No. 9 input from the low-delay path L is prioritized. 7 to No. 13 is adopted. Then, the gathering unit 33 selects the data No. 1 to No. 13 to the transmission buffer 34 without rearranging the order. The transmission buffer 34 stores data No. 1 to No. 13 is temporarily stored and output to the receiving device 4 without rearranging the order.

Note that the aggregation unit 33 determines the communication state of the low-delay path L based on the delay amount of the high-delay path H or based on the delay difference between the delay amount of the high-delay path H and the delay amount of the low-delay path L. data No. output to the low-delay path L at . 7 to No. 13 overlapped with data No. 7 to No. You may select 9 and discard it. That is, the aggregation unit 33 selects the data No. 1 already input from the high delay path H as an alternative. 4 to No. 6 will preferentially not be re-output to low delay path L. On the other hand, the aggregating unit 33 selects data No. which has not yet been input from the high-delay path H as an alternative. 7 to No. 9 will be preferentially re-output to the low delay path L.

Also, data No. 1 to No. 13 is output to either the low-delay path L or the high-delay path H, the data No. 1 to No. 13 as identifiers, the aggregation unit 33 may select and discard the data of the specific route based on these identifiers. Also, data No. 1 to No. 13 is input from the receive buffer 21 in the data number. 1 to No. 13 as identifiers, the aggregation unit 33 may select and discard duplicate data based on these identifiers.

　In the lower stages of FIGS. 6 and 7, the aggregation unit 33 may suspend data reception when the low-delay path L and the high-delay path H are disconnected. After the low-delay path L or the high-delay path H transitions from the disconnected state to the connected state, the aggregation unit 33 may resume data reception.

(Details of the second redundant communication system of the present disclosure)
9 and 10 show the processing contents of the second redundant communication system of the present disclosure. FIG. 11 shows the communication procedure of the second redundant communication system of the present disclosure. In the second redundant communication system (act-act system such as 1+1 redundancy) of the present disclosure, one act path is a low-delay path L but is temporarily disconnected, and the other act path is a high-delay path Although it is H, it is always in a communication state. Note that the data number and the number of data are for convenience of description, and are not actually limited to this.

Therefore, the branching unit 22 selects the data No. 1 to No. 3 to low-delay path L and high-delay path H (parallel low-delay transmission and high-delay transmission at the top of FIGS. 9 and 10). Then, the branching unit 22 selects the data No. 4 to No. 9 to high delay path H (single high delay transmission at top of FIGS. 9 and 10). Here, the transmitted buffer 25 stores data No. 4 to No. 9 is input from the branch 22 and held temporarily. Furthermore, the branching unit 22 selects the data No. 10 to No. 13 to low-delay path L and high-delay path H (parallel low-delay transmission and high-delay transmission at the top of FIGS. 9 and 10). That is, the branching unit 22 selects the data No. 1 to No. 13 to the high delay path H continuously.

Here, the branch unit 22 outputs data No. 1 to the high-delay transmission unit 24 in the disconnected state of the low-delay path L after the transition from the disconnected state of the low-delay path L to the connected state. 4 to No. 9, the data No. estimated to have not been received by the redundant receiver 3. 7 to No. 9 is preferentially re-output to the low-delay transmission unit 23 (parallel low-delay transmission and high-delay transmission in the upper stages of FIGS. 9 and 10). That is, the branching unit 22 selects the data No. 10 to No. 13 to the low-delay path L, the data No. 4 to No. 6 to the low-delay path L, and data No. 7 to No. 9 to the low delay path L again. Here, the branching unit 22 selects the data No. 4 to No. 6 is not input from the transmitted buffer 25, and data No. 7 to No. 9 is input from the transmitted buffer 25;

In addition, the branching unit 22 determines whether the redundant receiving device 3 has not received the Data No. estimated to be 7 to No. 9 is selected and re-output to the low-delay transmission unit 23 preferentially. That is, the branching unit 22 outputs the data No. 1 to the high delay path H. 4 to No. 6 is preferentially re-output to the low-delay path L after the transition of the low-delay path L from the disconnected state to the connected state. 4 to No. 6, it is determined that the redundant receiver 3 will be reached at an earlier time. On the other hand, the branching unit 22 outputs the data No. 1 to the high delay path H. 7 to No. 9 is preferentially re-output to the low-delay path L after the low-delay path L transitions from the disconnected state to the connected state. 7 to No. 9, it will reach the redundant receiver 3 at a later time.

In the upper stages of FIGS. 9 and 10 , the branching unit 22 suspends data transmission when the low-delay path L and the high-delay path H are disconnected, and holds the data whose transmission is suspended in the reception buffer 21 . After the low-delay path L or high-delay path H transitions from the disconnected state to the connected state, the branching unit 22 may resume data transmission and read the data whose transmission has been suspended from the reception buffer 21 .

The aggregation unit 33 collects data No. 1 to No. 3 is input from low delay path L and high delay path H (parallel low delay reception and high delay reception at the bottom of FIGS. 9 and 10). Then, the gathering unit 33 selects the data No. 4 to No. 9 is input from high delay path H (single high delay reception at the bottom of FIGS. 9 and 10). Further, the gathering unit 33 collects the data No. 7 to No. 13 is input from the low-delay path L, and data No. 10 to No. 13 is input from the high-delay path H (parallel low-delay reception and high-delay reception at the bottom of FIGS. 9 and 10). Then, the aggregation unit 33 collects the data No. 1 input from the high delay path H. 1 to No. 3, No. 7 to No. 13 is discarded.

Here, after the transition of the low-delay path L from the disconnected state to the connected state, the aggregation unit 33 calculates the data No. . 4 to No. 13, the data No. 1 output to the low-delay path L while the low-delay path L is in communication. 7 to No. 13 overlapped with data No. 7 to No. 13 (parallel low-delay reception and high-delay reception at the bottom of FIGS. 9 and 10). In other words, the aggregation unit 33 collects the data No. 1 input from the high delay path H. 4 to No. 6 is adopted, and data No. 6 input from the high delay path H is used. 7 to No. 13 is discarded, and data No. 1 input from the low-delay path L is discarded. 7 to No. 13 is adopted. Then, the gathering unit 33 selects the data No. 1 to No. 13 to the transmission buffer 34 without rearranging the order. The transmission buffer 34 stores data No. 1 to No. 13 is temporarily stored and output to the receiving device 4 without rearranging the order.

Note that the aggregation unit 33 determines the communication state of the low-delay path L based on the delay amount of the high-delay path H or based on the delay difference between the delay amount of the high-delay path H and the delay amount of the low-delay path L. data No. output to the low-delay path L at . 7 to No. 13 overlapped with data No. 7 to No. You may select 9 and discard it. That is, the aggregation unit 33 selects the data No. . 4 to No. 6 will not be re-output to low delay path L. On the other hand, in consideration of the amount of delay, the aggregation unit 33 selects data No. that has not yet been input from the high-delay path H. 7 to No. 9 will be re-output to low delay path L.

　In the lower stages of FIGS. 9 and 10, the aggregation unit 33 may suspend data reception when the low-delay path L and the high-delay path H are disconnected. After the low-delay path L or the high-delay path H transitions from the disconnected state to the connected state, the aggregation unit 33 may resume data reception.

(Integration of receive buffer and transmitted buffer of the present disclosure)
The integration of receive buffer 21 and transmitted buffer 25 of the present disclosure is illustrated in FIG. In the first and second redundant communication systems of the present disclosure, the reception buffer 21 and the transmitted buffer 25 may be integrated as one ring buffer as follows.

As in the normal case, the reception buffer 21 uses a pointer wt_pt indicating the write position and a pointer rd_pt indicating the read position. Unlike the normal case, the sent buffer 25 uses a pointer sent_rd_pt indicating the reading position and a pointer sent_depth_pt indicating the depth of the sent buffer 25 .

When receiving data, the receiving buffer 21 stores the data in the address ring. Write to data[wt_pt] and increment pointer wt_pt. When the receiving buffer 21 outputs the data, the data is transferred to the address ring. data[rd_pt], read time or redundant transmission time to address ring. Write to time[rd_pt] and increment pointer rd_pt.

The sent buffer 25 is ring. time[x]≧ring. Set pointer sent_depth_pt at x farthest from pointer rd_pt around the ring buffer in the backward direction that satisfies time[rd_pt]-T (where T is the time the data should be held in sent buffer 25). When the transmitted buffer 25 receives data, it stores the data at the address ring. Write to data [sent_depth_pt→around the forward direction of the ring buffer]. Furthermore, when the transmitted buffer 25 re-outputs the data, the data is transferred to the address ring. Read from data [sent_rd_pt→forward rotation of ring buffer]. Here, when the transmitted buffer 25 re-outputs the data, the data is transferred to the address ring. It is not always read from data[sent_depth_pt] (data No. 4 to No. 6 are not re-output in FIGS. 8 and 11).

If the pointers wt_pt and rd_pt match, the receive buffer 21 is empty. If the pointers sent_rd_pt and rd_pt match, the sent buffer 25 is empty. Also, if the pointer wt_pt matches the pointer sent_depth_pt as a result of the increment, the ring buffer is in an out of memory error state. Also, even if the pointer sent_depth_pt coincides with the pointer wt_pt as a result of backward scanning, the ring buffer is in an insufficient memory error state.

　In the state shown in FIG. 12, the address ring. data[wt_pt]=address 12 and address ring. data[rd_pt]=address 8 and address ring. data[sent_depth_pt]=address 3 and address ring. data[sent_rd_pt]=address4. Data accumulated in the reception buffer 21 is stored from address 8 to address 11, and data accumulated in the transmitted buffer 25 is stored from address 3 to address 7. FIG.

Since the receive buffer 21 and the transmitted buffer 25 are implemented as a single ring buffer, the data copy process is reduced and the buffering process is speeded up.

The redundant transmitting device, redundant receiving device, redundant transmitting method, redundant receiving method, redundant transmitting program, and redundant receiving program according to the present disclosure provide delay differences rather than the same amount of delay for multiple routes between the transmitting device and the receiving device. can be applied even when is large (such as when utilizing communication media with significantly different propagation velocities (speed of sound << speed of light) and/or physical path lengths).

L: low-delay path H: high-delay path 1: transmitter 2: redundant transmitter 3: redundant receiver 4: receiver 21: reception buffer 22: branch unit 23: low-delay transmitter 24: high-delay transmitter 25: Sent buffer 26: communication state detection unit 31: low delay reception unit 32: high delay reception unit 33: aggregation unit 34: transmission buffer 35: communication state detection unit

Claims

a low-delay transmitter that outputs data to a low-delay path;
a high-delay transmitter that outputs data to a high-delay path;
a branching unit that outputs data to the low-delay transmission unit and/or the high-delay transmission unit;
A redundant transmitter comprising:
After the transition from the disconnected state of the low-delay path to the connected state, the branching unit determines that data output to the high-delay transmission unit in the disconnected state of the low-delay path has not been received by the redundant receiving device. A redundant transmitter, wherein the estimated data is re-output to the low-delay transmitter, thereby preventing the order of data input in the redundant transmitter and the output order of data in the redundant receiver from being exchanged. .
The branch unit is not received by the redundant receiving device based on the delay amount of the high delay path or based on the delay difference between the delay amount of the high delay path and the delay amount of the low delay path. 2. The redundant transmission device according to claim 1, wherein the data estimated to be selected is re-output to the low-delay transmission unit.
a low-delay receiver that inputs data from a low-delay path;
a high-delay receiver for inputting data from a high-delay path;
a collecting unit that inputs data from the low-delay receiving unit and/or the high-delay receiving unit;
A redundant receiver comprising:
The redundant receiver corresponds to the redundant transmitter according to claim 1 or 2,
After the transition from the disconnection state of the low-delay path to the connection state, the aggregation unit converts data output to the high-delay path in the disconnection state of the low-delay path to Redundancy characterized by discarding data that duplicates data output to a low-delay path, and preventing exchange of the data input order in the redundant transmitter and the data output order in the redundant receiver. receiving device.
Based on the delay amount of the high-delay path, or based on the delay difference between the delay amount of the high-delay path and the delay amount of the low-delay path, the aggregation unit, in the communication state of the low-delay path, 4. The redundant receiver according to claim 3, wherein data that duplicates data output to the low-delay path is selected and discarded.
a low-latency transmission step of outputting data to a low-latency path;
a high delay transmission step of outputting data to a high delay path;
a branching step of outputting data to the low-delay transmission step or/and the high-delay transmission step;
A redundant transmission method comprising:
In the branching step, after the transition from the disconnected state of the low-delay path to the connected state, it is determined that the data output to the high-delay transmission step in the disconnected state of the low-delay path has not been received by the redundant reception method. A redundant transmission method, characterized in that the estimated data is re-output to the low-delay transmission step, and the replacement of the data input order in the redundant transmission method and the data output order in the redundant reception method is prevented. .
a low-latency receiving step of inputting data from a low-latency path;
a high-delay receiving step of inputting data from a high-delay path;
an aggregation step of inputting data from the low-delay receiving step or/and the high-delay receiving step;
A redundant receiving method comprising:
The redundant reception method corresponds to the redundant transmission method according to claim 5,
After the transition from the disconnected state of the low-delay path to the connected state of the low-delay path, the aggregating step includes, among the data output to the high-delay path in the disconnected state of the low-delay path, the Redundancy characterized by discarding data that duplicates data output to a low-delay path, and preventing exchange of the data input order in the redundant transmission method and the data output order in the redundant reception method. receiving method.
a low-latency transmission step of outputting data to a low-latency path;
a high delay transmission step of outputting data to a high delay path;
a branching step of outputting data to the low-delay transmission step or/and the high-delay transmission step;
A redundant transmission program for causing a computer to execute
In the branching step, after the transition from the disconnected state of the low-delay path to the connected state, it is determined that the data output to the high-delay transmission step in the disconnected state of the low-delay path has not been received by the redundant receiving device. A redundant transmission program characterized by re-outputting the estimated data to the low-delay transmission step, and preventing exchange of the data input order in the redundant transmission device and the data output order in the redundant reception device.
a low-latency receiving step of inputting data from a low-latency path;
a high-delay receiving step of inputting data from a high-delay path;
an aggregation step of inputting data from the low-delay receiving step or/and the high-delay receiving step;
A redundant receiving program for causing a computer to execute
The redundant reception program corresponds to the redundant transmission program according to claim 7,
After the transition from the disconnected state of the low-delay path to the connected state of the low-delay path, the aggregating step includes, among the data output to the high-delay path in the disconnected state of the low-delay path, the A redundant receiving program characterized by discarding data that duplicates data output to a low-delay path, and preventing the switching of the data input order in a redundant transmitter and the data output order in a redundant receiver. .