JP7034397B2 - Route redundancy system, sender device, receiver device, route redundancy method, and route redundancy program - Google Patents

Description

The present disclosure relates to a route redundancy system, a transmitting side device, a receiving side device, a route redundancy method, and a route redundancy program.

Route redundancy is a technology that multiplexes routes so that functions can be continued even if a part of the system fails.

In the technique of Patent Document 1, in the transmission unit, a cell frame in which a synchronization cell is inserted is duplicated at a predetermined cycle, and a plurality of the same cell frames are transmitted in parallel. Further, the receiving side selects one of the plurality of cell frames transmitted from the transmitting unit. This makes it possible to prevent cell frame loss in the transmission device.

Japanese Unexamined Patent Publication No. 08-181697

In Patent Document 1, it is possible to prevent cell frame loss in a transmission device, but it is not possible to obtain a completely redundant configuration in a network by using a plurality of transmission devices and a plurality of reception devices.

It is an object of the present disclosure to obtain a complete redundant configuration in a network by using a plurality of transmitting devices and a plurality of receiving devices.

The route redundancy system according to the present disclosure includes a plurality of transmitting side devices and a plurality of receiving side devices, and each of the plurality of transmitting side devices is connected to the plurality of receiving side devices via a network to obtain information. In a route redundancy system that makes routes redundant,
Each of the plurality of transmitting side devices
Upon receiving a synchronization signal for synchronously operating the plurality of transmitting side devices, an information generation unit that generates transmission information to be transmitted to the plurality of receiving side devices according to the synchronization signal, and an information generation unit.
An identification information adding unit that generates identification information that identifies the transmission information, attaches the identification information to the transmission information, and outputs the transmission information to which the identification information is attached as identification addition information.
It is provided with a duplicate transmission unit that duplicates the identification grant information and transmits each of the duplicated identification grant information to each of the plurality of receiving side devices.
Each of the plurality of receiving devices is
It is provided with an information acquisition unit that receives the identification-giving information transmitted from each of the plurality of transmission-side devices as a plurality of identification-giving information and acquires the transmission information based on the plurality of identification-giving information.

In the route redundancy device according to the present disclosure, a complete route redundancy configuration can be obtained in a network by a plurality of transmitting side devices and a plurality of receiving side devices.

It is a figure which shows the configuration example 1 of the route redundancy system 100 which concerns on Embodiment 1. FIG. It is a figure which shows the configuration example 2 of the route redundancy system 100 which concerns on Embodiment 1. FIG. It is a functional block diagram of the transmission side apparatus 10 which concerns on Embodiment 1. FIG. It is a functional block diagram of the receiving side apparatus 20 which concerns on Embodiment 1. FIG. It is a hardware block diagram of the transmission side apparatus 10 which concerns on Embodiment 1. FIG. It is a hardware block diagram of the receiving side apparatus 20 which concerns on Embodiment 1. FIG. It is a flow chart which shows the operation of the transmission side apparatus 10 which concerns on Embodiment 1. FIG. It is a schematic diagram which shows the operation of the transmission side apparatus 10 which concerns on Embodiment 1. FIG. It is a flow chart which shows the operation of the receiving side apparatus 20 which concerns on Embodiment 1. FIG. It is a schematic diagram which shows the operation of the receiving side apparatus 20 which concerns on Embodiment 1. FIG. It is a flowchart of the selective disposal process by the receiving side apparatus 20 which concerns on Embodiment 1. FIG. It is a process example 1 of the selective disposal process of the data unit by the information acquisition unit 220 according to the first embodiment. It is a processing example 2 of the selective disposal processing of the data unit by the information acquisition unit 220 which concerns on Embodiment 1. FIG. It is a processing example 3 of the selective disposal processing of the data unit by the information acquisition unit 220 which concerns on Embodiment 1. FIG. It is a processing example 4 of the selective disposal processing of the data unit by the information acquisition unit 220 which concerns on Embodiment 1. FIG. It is a figure which shows the configuration example 3 of the route redundancy system 100 which concerns on the modification of Embodiment 1. FIG. It is a figure which shows the configuration example 4 of the route redundancy system 100 which concerns on the modification of Embodiment 1. FIG. It is a functional block diagram of the receiving side apparatus 20 provided with the relay adapter 40 which concerns on the modification of Embodiment 1. FIG. It is a hardware block diagram of the receiving side apparatus 20 provided with the relay adapter 40 which concerns on the modification of Embodiment 1. FIG.

Hereinafter, the present embodiment will be described with reference to the drawings. In each figure, the same or corresponding parts are designated by the same reference numerals. In the description of the embodiment, the description will be omitted or simplified as appropriate for the same or corresponding parts. Further, in the following figure, the relationship between the sizes of the constituent members may differ from the actual one.

Embodiment 1.
*** Explanation of configuration ***
FIG. 1 is a diagram showing configuration example 1 of the route redundancy system 100 according to the present embodiment.
FIG. 2 is a diagram showing a configuration example 2 of the route redundancy system 100 according to the present embodiment.

The route redundancy system 100 according to the present embodiment is a communication network system that transmits / receives information and makes the information route redundant. The route redundancy system 100 includes a plurality of transmitting side devices 10 and a plurality of receiving side devices 20. The transmitting device 10 transmits information. The receiving device 20 receives the information transmitted from the transmitting device 10.
The route redundancy system 100 includes a plurality of transmitting side devices 10 and a plurality of receiving side devices 20 for route redundancy. FIG. 1 illustrates a basic configuration of two transmitting side devices 10 and two receiving side devices 20.

Each of the plurality of transmitting side devices 10 is connected to the plurality of receiving side devices 20 via the network 500. In FIG. 1, each of the two transmitting side devices 10 is connected to the two receiving side devices 20 by a network 500. In FIG. 1, the network 500 is represented by a line directly connected to each of the transmitting side devices 10 and each of the two receiving side devices 20.

In FIG. 1, the two transmitting side devices 10 receive a synchronization signal 31 and synchronize the timing of operation and internal processing with each other.
In FIG. 2, the two transmitting side devices 10 receive the synchronization signal 31 via the synchronization server 30 and synchronize the timing of the operation and the internal processing. In the configuration example 2 of FIG. 2, the route redundancy system 100 includes a synchronization server 30 that generates a synchronization signal 31 and outputs the synchronization signal 31 to each of the plurality of transmitting side devices 10.

The synchronization signal 31 is information for synchronization for operating a plurality of transmitting side devices 10 in synchronization.
The synchronization signal 31 is generated by a transmitting device 10 having an accurate clock or timer function, or a synchronization server 30 having an accurate clock or timer function. The synchronization signal 31 is delivered to all transmitting devices 10. FIG. 1 is an example in which the transmitting side device 10 generates a synchronization signal 31. Further, FIG. 2 is an example in which the synchronization server 30 generates the synchronization signal 31.
The synchronization signal 31 is a signal for synchronizing between the transmitting side devices 10, such as a periodic pulse signal or a toggle signal. Alternatively, the synchronization signal 31 may be a data signal including timing information such as time.

<Function of transmitter 10>
The plurality of transmitting side devices 10 receive the synchronization signal 31 at an arbitrary timing or periodically. All transmitting devices 10 operate synchronously according to the synchronization signal 31.
The synchronization signal 31 is transmitted and received between a plurality of transmitting side devices 10 at an arbitrary timing or periodically. Alternatively, the synchronization signal 31 is transmitted from the synchronization server 30 to each of the plurality of transmitting side devices 10 at an arbitrary timing or periodically.
All synchronized transmitters 10 perform exactly the same internal processing.
Further, all the synchronized transmitting side devices 10 transmit the transmission information 11 having the same contents to the different networks 500 to which they are connected at the same timing.

The transmitting side device 10 duplicates and transmits the transmission information 11 to each of the plurality of receiving side devices 20. That is, the transmitting side device 10 duplicates and transmits the transmission information 11 to the network 500 connected to each of the plurality of receiving side devices 20. As described above, the two transmitting side devices 10 are synchronized with each other, and transmit the transmission information 11 having the same contents at the same timing. At that time, each transmitting side device 10 adds the identification information to the transmitting information 11. The transmitting device 10 transmits the transmission information 11 in units of, for example, an IP (Internet Protocol) packet or an Ethernet (registered trademark) frame.

<Function of receiving device 20>
The receiving side device 20 receives all the transmission information 11 from the plurality of transmitting side devices 10 via the network 500 connected to each of the plurality of transmitting side devices 10.
The receiving device 20 identifies the same information at the same timing in the transmission information 11 based on the identification information given to the transmission information 11.
The receiving device 20 selects the transmission information 11 based on the identification result. As a result, the receiving side device 20 can acquire the transmission information 11 without duplication. Further, the receiving side device 20 transfers the transmission information 11 to the information processing function.

FIG. 3 is a functional configuration diagram of the transmitting side device 10 according to the present embodiment.
FIG. 4 is a functional configuration diagram of the receiving side device 20 according to the present embodiment.
FIG. 5 is a hardware configuration diagram of the transmitting side device 10 according to the present embodiment.
FIG. 6 is a hardware configuration diagram of the receiving side device 20 according to the present embodiment.

A configuration example of the transmitting side device 10 and the receiving side device 20 according to the present embodiment will be described with reference to FIGS. 3 and 4.
Each of the transmitting side device 10 and the receiving side device 20 is a computer. Each of the transmitting device 10 and the receiving device 20 comprises a processor 910 and an electronic circuit 909, as well as other hardware such as a memory 921 and a network interface 950. It also has an auxiliary storage device (not shown). The processor 910 and the electronic circuit 909 are connected to other hardware via a signal line and control these other hardware.
For the sake of simplicity, the hardware provided by each of the transmitting side device 10 and the receiving side device 20 will be described with a common reference numeral. However, each of the transmitting side device 10 and the receiving side device 20 is a different computer, and each device has its own hardware.

The transmission side device 10 has an information generation unit 110, an identification information addition unit 120, and a replication transmission unit 130 as functional elements. For example, the function of the information generation unit 110 is realized by software using the processor 910. The functions of the identification information giving unit 120 and the replication transmission unit 130 are realized by hardware using the electronic circuit 909.
Further, the transmitting side device 10 may include a plurality of processors that replace the processor 910. These plurality of processors may share the functions of the information generation unit 110. Alternatively, the transmitting device 10 may include a processor and an electronic circuit that replace the processor 910. For example, the processor may realize some functions of the information generation unit 110, and the electronic circuit may realize the remaining functions of the information generation unit 110.

The receiving device 20 has a waiting buffer 210, an information acquisition unit 220, and an information processing unit 230 as functional elements. For example, the function of the information processing unit 230 is realized by software using the processor 910. The function of the information acquisition unit 220 is realized by hardware using an electronic circuit 909. The wait buffer 210 is provided in the memory 921.
Further, the receiving device 20 may include a plurality of processors that replace the processor 910. These plurality of processors may share the functions of the information processing unit 230. Alternatively, the receiving device 20 may include a processor and an electronic circuit that replace the processor 910. For example, the processor may realize some functions of the information processing unit 230, and the electronic circuit may realize the remaining functions of the information processing unit 230.

In the following description, the functions of the identification information giving unit 120 and the replication transmission unit 130 may be referred to as a transmission control function. Further, the functions of the wait buffer 210 and the information acquisition unit 220 may be referred to as a reception control function.

The processor 910 is an IC (Integrated Circuit) that performs arithmetic processing. Specific examples of the processor 910 are a CPU (Central Processing Unit), a DSP (Digital Signal Processor), and a GPU (Graphics Processing Unit).

The electronic circuit 909 is a dedicated electronic circuit that realizes each function of the transmission control function and the reception control function. The electronic circuit 909 is specifically a single circuit, a composite circuit, a programmed processor, a parallel programmed processor, a logic IC, a GA, an ASIC, or an FPGA. GA is an abbreviation for Gate Array. ASIC is an abbreviation for Application Specific Integrated Circuit. FPGA is an abbreviation for Field-Programmable Gate Array.

Each function of the transmission control function and the reception control function may be realized by one electronic circuit, or may be distributed and realized by a plurality of electronic circuits. Further, some functions of the transmission control function and the reception control function may be realized by an electronic circuit, and the remaining functions may be realized by software. In addition, some or all of the transmission control function and the reception control function may be realized by the firmware.

The memory 921 is a storage device that temporarily stores data. A specific example of the memory 921 is a SRAM (Static Random Access Memory) or a DRAM (Dynamic Random Access Memory).
Auxiliary storage is a storage device that stores data. A specific example of the auxiliary storage device is an HDD. Further, the auxiliary storage device may be a portable storage medium such as an SD (registered trademark) memory card, CF, NAND flash, flexible disk, optical disk, compact disc, Blu-ray (registered trademark) disk, or DVD. HDD is an abbreviation for Hard Disk Drive. SD (registered trademark) is an abbreviation for Secure Digital. CF is an abbreviation for CompactFlash®. DVD is an abbreviation for Digital Versaille Disk.

The network interface 950 is a port connected to the network 500. Specifically, the transmitting side device 10 includes two output ports for connecting to each of the two receiving side devices 20. Further, the receiving side device 20 includes two input ports for connecting to each of the two transmitting side devices 10.

Further, each of the transmitting side device 10 and the receiving side device 20 may be provided with hardware such as an input interface, an output interface, and a communication device.
The input interface is a port connected to an input device such as a mouse, keyboard, or touch panel. Specifically, the input interface is a USB (Universal Serial Bus) terminal. The input interface may be a port connected to a LAN (Local Area Network).
The output interface is a port to which a cable of an output device such as a display is connected. Specifically, the output interface is a USB terminal or an HDMI (registered trademark) (High Definition Multimedia Interface) terminal. Specifically, the display is an LCD (Liquid Crystal Display).
The communication device has a receiver and a transmitter. The communication device is connected to a communication network such as a LAN, the Internet, or a telephone line. The communication device is specifically a communication chip or a NIC (Network Interface Card).

The route redundancy program is executed in the route redundancy system 100. The route redundancy program is a program that realizes the functions of each part of the transmitting side device 10 and the receiving side device 20.
The route redundancy program is executed by the processor 910 and the electronic circuit 909.
For example, it is read into processor 910 and executed by processor 910. In the memory 921, not only the route redundancy program but also the OS (Operating System) is stored. The processor 910 executes the route redundancy program while executing the OS. The route redundancy program and the OS may be stored in the auxiliary storage device. The route redundancy program and the OS stored in the auxiliary storage device are loaded into the memory 921 and executed by the processor 910. A part or all of the route redundancy program may be incorporated in the OS.
Data, information, signal values and variable values used, processed or output by the route redundancy program are stored in a memory 921, an auxiliary storage device, or a register or cache memory in the processor 910.

The "part" of each part of the transmitting side device 10 and the receiving side device 20 may be read as "processing", "procedure", or "process". The route redundancy program causes the computer to execute each process in which each part of the transmitting side device 10 and the receiving side device 20 is read as "processing". Each part of the transmitting side device 10 and the receiving side device 20 is referred to as a "program", a "program product", a "computer-readable storage medium in which a program is stored", or a "computer-readable recording medium in which a program is recorded". May be read as ". Further, the route redundancy method is a method performed by the route redundancy system 100 executing a route redundancy program.
The route redundancy program may be provided stored in a computer-readable recording medium. Further, the route redundancy program may be provided as a program product.

Further, as shown in FIG. 4, the function of the information generation unit 110 may be realized by a general-purpose or dedicated computer 101. Further, the transmission control function, which is a function of the identification information giving unit 120 and the duplicate transmission unit 130, is arranged between the general-purpose or dedicated computer 101 and the network interface 950. This transmission control function is intended to add, insert, control, and delete information to communication data, and is realized by a programmable device such as FPGA or LSI.
Further, as shown in FIG. 5, the function of the information processing unit 230 may be realized by a general-purpose or dedicated computer 201. Further, the reception control function, which is a function of the information acquisition unit 220, is arranged between the general-purpose or dedicated computer 201 and the network interface 950. This reception control function is intended to add, insert, control, and delete information to communication data, and is realized by a programmable device such as FPGA or LSI.

Each of the processor and the electronic circuit is also called a processing circuit. That is, the transmission control function of the transmission side device 10 and the reception control function of the reception side device 20 are realized by the processing circuit.

*** Explanation of operation ***
Next, the operation of the route redundancy system 100 according to the present embodiment will be described. The operation procedure of the route redundancy system 100 corresponds to the route redundancy method. Further, the program that realizes the operation of the route redundancy system 100 corresponds to the route redundancy program.
In the following, a specific example of the configuration of the route redundancy system 100 is a case where the transmitting side device 10 is two units and the receiving side device 20 is two units. However, even if each of the transmitting side device 10 and the receiving side device 20 has an N (N is a natural number) unit configuration, the same operation and processing can be applied.

<Operation of transmitter 10>
FIG. 7 is a flow chart showing the operation of the transmitting side device 10 according to the present embodiment.
FIG. 8 is a schematic diagram showing the operation of the transmission side device 10 according to the present embodiment.
In the route redundancy system 100, it is premised that all the transmitting side devices 10 having a redundant configuration operate in synchronization.

In step S101, when the information generation unit 110 receives the synchronization signal 31 for synchronously operating the plurality of transmitting side devices 10, the information generation unit 110 generates the transmission information 11 to be transmitted to the plurality of receiving side devices 20 according to the synchronization signal 31. do. The information generation unit 110 outputs the transmission information 11 as a plurality of transmission frames. The information generation unit 110 may output the transmission information 11 as a plurality of transmission packets.
In the specific example of FIG. 8, the information generation unit 110 outputs the transmission information 11 as transmission frames # 1 to # 4.

In step S102, the identification information giving unit 120 generates the identification information 21 that identifies the transmission information 11, assigns the identification information 21 to the transmission information 11, and assigns the transmission information 11 to which the identification information 21 is attached to the identification grant information 13. Is output as. Specifically, the identification information giving unit 120 periodically inserts the identification information 21 into a plurality of transmission frames as identification frames, and outputs a plurality of transmission frames in which the identification frames are periodically inserted as identification grant information 13. do. The identification information giving unit 120 includes information for identifying a transmission frame output between the identification frame and the identification frame output immediately before the identification frame in the identification frame.

In the specific example of FIG. 8, the identification information giving unit 120 periodically inserts the identification frames MK1 and MK2 into the plurality of transmission frames # 1 to # 4. The identification frame is also called a marker frame. The identification grant information 13 is a plurality of transmission frames # 1 to # 4 in which the identification frames MK1 and MK2 are periodically inserted. For example, the identification information adding unit 120 identifies information for identifying transmission frames # 3 and # 4 output between the identification frame MK2 and the identification frame MK1 output immediately before the identification frame MK2 in the identification frame MK2. To include.

The identification frame stores transmission frame information such as the checksum calculation result of all transmission frames transmitted between the identification frames, the number of frames, and the number of frame octets.
In the specific example of FIG. 8, the identification frames MK1 and MK2 are inserted in the transmission frames # 1 to # 4. The identification frame MK1 stores transmission frame information such as the checksum calculation results of transmission frames # 1 and # 2, the number of frames, and the number of frame octets. The identification frame MK2 stores transmission frame information such as the checksum calculation results of transmission frames # 3 and # 4, the number of frames, and the number of frame octets.

The features of the identification information 21 will be described below.
(1) Identification information 21 including transmission order information is added to the transmission information 11 from the transmission side device 10.
(2) The transmission order information includes a sequence number based on the number of transmission frames from the reference time point in the transmission side device 10.
(3) The transmission order information includes information that identifies the transmitting side device 10. The information that identifies the transmitting side device 10 is, for example, a device ID (Identifier). However, all the transmitting side devices 10 having a redundant configuration have the same device ID. All the transmitting side devices 10 having a redundant configuration are a group of devices that transmit the same transmission information 11. This information is used to identify "the same frame group transmitted by the redundant transmitting side device group".
(4) The identification information 21 inserts an identification frame into a data unit in which a plurality of transmission frames are grouped together. That is, the data unit is a frame group including the identification information 21 and the transmission frame identified by the identification information 21.
(5) The data unit in which a plurality of frames are grouped together is the same unit among all the transmitting side devices 10, and a delimiter is provided based on the synchronization signal 31 which is the above-mentioned synchronization information. For example, the transmission frames from the time when the transmission side device 10 receives the synchronization pulse to the time when the transmission side device 10 receives the next synchronization pulse are grouped together.
(6) The identification frame inserted in the data unit contains information for checking the communication quality. For example, the checksum calculation result of the transmission frame in the data unit and the information of the number of frames in the data unit are included.

In step S103, the duplication transmission unit 130 duplicates the identification grant information 13, and transmits each of the duplicated identification grant information 13 to each of the plurality of receiving side devices 20. Specifically, the duplicate transmission unit 130 copies and outputs all transmission frames to all output ports.
In the specific example of FIG. 8, in the duplicate transmission unit 130, transmission frames # 1 to # 4 into which the identification frames MK1 and MK2 are inserted are copied and output to the two output ports.

<Operation of receiving device 20>
FIG. 9 is a flow chart showing the operation of the receiving side device 20 according to the present embodiment.
FIG. 10 is a schematic diagram showing the operation of the receiving side device 20 according to the present embodiment.

In step S201, the wait buffer 210 waits for the same data unit based on the identification information 21 with the frame group including the identification information 21 and the transmission frame identified by the identification information 21 as the data unit. The wait buffer 210 outputs the same data unit that has been waited for. Specifically, the wait buffer 210 acquires the identification grant information 13 from a plurality of input ports and waits until the same identification frame arrives. When the same identification frame arrives, the wait buffer 210 outputs a data unit including a transmission frame and an identification frame corresponding to the identification frame. In this way, the wait buffer 210 monitors the arrival of the identification frame having the same identification information, and determines whether or not the identification frame having the same identification information arrives at the input from all the input ports.

In step S202, the information acquisition unit 220 receives the identification grant information 13 transmitted from each of the plurality of transmitting side devices 10 as the plurality of identification grant information 13. Specifically, the information acquisition unit 220 receives the same data unit from the wait buffer 210 as a plurality of identification grant information 13.
The information acquisition unit 220 acquires the transmission information 11 based on the plurality of identification grant information 13. Specifically, the information acquisition unit 220 selects a data unit from the same data unit based on the reception order of the same data unit and the reception quality of each of the same data units, and uses the selected data unit. To acquire the transmission information 11. The information acquisition unit 220 is also referred to as a data unit selective disposal processing unit.

The information acquisition unit 220 compares the consistency check results for the identification information 21 and determines an input route to be selected and an input route to be discarded. As shown in FIG. 10, when the receiving side device 20 receives the identification grant information 13 from the two input ports of the 1st system and the 2nd system, the information acquisition unit 220 selects the input path of the 1st system or the 2nd system.
Specifically, the information acquisition unit 220 calculates the checksum of the transmitted frame received before receiving the identification frame, and compares it with the checksum value in the identification frame. The information acquisition unit 220 determines that the reception is normal if they match, and determines that an abnormality has occurred if they do not match. Further, the information acquisition unit 220 compares the number of received frames received between the identification frames with the information on the number of frames included in the identification frame, and if they do not match, it is determined that some frame loss or abnormality has occurred. Based on these, the quality of the communication line is judged.
The system is selected according to the combination of the quality of the communication line and the first-come-first-served basis.

The selective disposal process of the data unit by the information acquisition unit 220 will be described below.

(1) The receiving side device 20 has a function of selecting and discarding the same transmission frame received from a plurality of routes without being missed or duplicated.
(2) Whether or not the transmission frames are the same is determined based on the identification information 21.
(3) The receiving side device 20 identifies "the same frame group transmitted by the transmitting side device group having a redundant configuration" from the identification information 21.
(4) The receiving side device 20 compares the communication quality based on the communication quality check information included in the identification information 21 for each frame or data unit identified as the same received from a plurality of routes. The receiving device 20 selects the transmission frame or data unit having the highest quality, and discards the others to discard the duplicated portion.
(5) When the communication quality is the same, the receiving device 20 determines the selection target based on a certain rule. For example, the receiving device 20 determines a selection target by a fixed setting, a setting by a user who is an administrator, or a round robin.
(6) In order to absorb the path delay difference of the received data from a plurality of routes, the receiving side device 20 is provided with a buffer in each input port for retaining the received transmission frame for a certain period of time.
(7) The capacity of the wait buffer is determined based on the maximum value of the route delay difference. The receiving side device 20 stores the input from each input port in a waiting buffer whose size is determined from the maximum value of the path delay difference between each transmitting side device 10.
As described above, the receiving side device 20 includes a waiting buffer 210 that waits for the transmission information 11 transmitted at the same timing on the transmitting side from all the input ports. In the subsequent stage, the transmission information group transmitted at the same timing on the transmission side is compared in frame units or data units, the reception information with better communication quality is selected, and the other information is discarded.

FIG. 11 is a flowchart of the selective disposal process by the receiving side device 20 according to the present embodiment. In the following description, for example, selecting one system means selecting the data unit of one system. Further, discarding the 1st system means discarding the data unit of the 1st system.

In step S21, the information acquisition unit 220 receives the identification frame.
In step S22, the information acquisition unit 220 checks the reception quality of the data unit.
In step S23, if it is a 1-system data unit, the process proceeds to step S24, and if it is a 2-system data unit, the process proceeds to step S33.
In step S24, the information acquisition unit 220 determines whether or not the data unit of one system is first-come-first-served, and if it is first-come-first-served, the process proceeds to step S30. If the data unit of the first system is not first-come-first-served, the process proceeds to step S25.
In step S25, if the wait timer has expired, the process proceeds to step 29, and the second system is selected. If the wait timer has not expired, proceed to step 26.
In step S26, the information acquisition unit 220 determines the reception quality of each data unit of the 1st system and the 2nd system, and if the reception quality of the data unit of the 1st system is higher than the 2nd system, the 1st system is selected (step S28). .. If the reception quality of the data unit of the 1 system is 2 or less, the 2 system is selected (step S27).

In step S30 and step S31, the information acquisition unit 220 waits for the data unit of another system until the wait timer expires. When the wait timer expires, one system is selected in step S32.

The processing from step S33 to step S41 is the processing when the information acquisition unit 220 acquires the data unit of the second system in step S23, and the content of the processing is the same as the processing from step S24 to step S32.

FIG. 12 is a processing example 1 of the selective disposal processing of the data unit by the information acquisition unit 220 according to the present embodiment.
FIG. 13 is a processing example 2 of the selective disposal processing of the data unit by the information acquisition unit 220 according to the present embodiment.
FIG. 14 is a processing example 3 of the selective disposal processing of the data unit by the information acquisition unit 220 according to the present embodiment.
FIG. 15 is a processing example 4 of the selective disposal processing of the data unit by the information acquisition unit 220 according to the present embodiment.
In FIGS. 12 to 15, it is assumed that the information acquisition unit 220 receives data in the order of data units (1) to (4).

In the processing example 1 of FIG. 12, in the data unit (1), since the data unit of the 2 system is first-come-first-served, the 2 system is selected and the 1 system is discarded. In the data unit (2), since the data unit of the 2 system is poor reception, the 1 system is selected and the 2 system is discarded. In the data units (3) and (4), the data unit of the 2 system is first-come-first-served, so the 2 system is selected and the 1 system is discarded.

In the process example 2 of FIG. 13, in the data unit (1), since the data unit of the 2 system is first-come-first-served, the 2 system is selected and the 1 system is discarded. In the data unit (2), both systems have poor reception, but the data unit of the 1 system is judged to have a better communication condition, the 1 system is selected, and the 2 system is discarded. In the data units (3) and (4), the data unit of the 2 system is first-come-first-served, so the 2 system is selected and the 1 system is discarded.

In the processing example 3 of FIG. 14, in the data unit (1), since the data unit of the 2 system is first-come-first-served, the 2 system is selected and the 1 system is discarded. In the data unit (2), both systems have not arrived and timed out, so the immediately preceding selection system is continued. Then, in the data unit (3), the next identification frame has arrived, but since the normality of both systems cannot be confirmed, the immediately preceding system selection state is maintained. In the data unit (4), since the data unit of the 2 system is first-come-first-served, the 2 system is selected and the 1 system is discarded.

In the processing example 4 of FIG. 15, in the data unit (1), since the data unit of the 2 system is first-come-first-served, the 2 system is selected and the 1 system is discarded. In the data unit (2), both systems have not arrived and timed out, so the immediately preceding selection system is continued. In the data unit (3), the identification frame arrives in one system, but the normality cannot be confirmed, so the immediately preceding system selection state is maintained. In the data unit (4), since only the data unit of the 1st system is normally received, the 1st system is selected and the 2nd system is discarded.

In step S203, the information processing unit 230 receives the transmission information 11 from the information acquisition unit 220 and performs information processing using the transmission information 11.

*** Other configurations ***
<Modification 1>
FIG. 16 is a diagram showing a configuration example 3 of the route redundancy system 100 according to a modified example of the present embodiment.
FIG. 17 is a diagram showing a configuration example 4 of the route redundancy system 100 according to a modified example of the present embodiment.
FIG. 18 is a functional configuration diagram of a receiving side device 20 including a relay adapter 40 according to a modified example of the present embodiment.
FIG. 19 is a hardware configuration diagram of a receiving side device 20 including a relay adapter 40 according to a modified example of the present embodiment.

In the configuration example 3 of FIG. 16 and the configuration example 4 of FIG. 17, the receiving side device 20 includes a relay adapter 40 including a waiting buffer 210 and an information acquisition unit 220. In the configuration example 3 and the configuration example 4, the relay adapter 40 once receives the transmission information 11 transmitted from the transmission side device 10. The relay adapter 40 aggregates the transmission information 11 into one and outputs the transmission information 11 to the information processing unit 230. As shown in FIGS. 18 and 19, the information processing unit 230 is mounted on, for example, a general-purpose or dedicated computer 201. The computer 201 receives the transmission information 11 aggregated by the relay adapter 40.

<Modification 2>
In the present embodiment, the identification information adding unit 120 inserts an identification frame containing the identification information 21 between transmission frames according to the synchronization pulse of the synchronization signal 31. However, the identification information adding unit 120 may embed the identification information 21 in the transmission frame at regular intervals among the plurality of transmission frames according to the synchronization pulse input of the synchronization signal 31. The identification information giving unit 120 may output a plurality of transmission frames in which the identification information 21 is embedded in the transmission frames at regular intervals as the identification giving information 13. At this time, the identification information adding unit 120 sets the transmission frame at regular intervals between the transmission frame at regular cycles and the transmission frame at regular cycles output immediately before the transmission frame at regular cycles. The information for identifying the transmission frame output to is included as the identification information 21.

Specifically, the identification information adding unit 120 embeds the identification information 21 in the header, payload, or footer of the transmission frame at the timing of the synchronization pulse.
The receiving device 20 detects a transmission frame in which the identification information 21 is embedded, and performs a selective disposal process.

<Modification 3>
Although the identification frame is used in the present embodiment, it is also possible to use the synchronization pulse only for synchronization of the processing timing without using the identification frame.
Specifically, the transmitting side device 10 inserts the identification information 21 into each transmission frame and transmits the identification information 21. The identification information 21 is information such as an ID of the transmitting side device, order information, and a checksum calculation result. In this case, the order information has a different value for each transmission frame. Normally, the order information is incremented and given to each transmission frame.

The receiving side device 20 extracts the identification information 21 in each received transmission frame, and determines from the ID and the order information of the transmitting side device that the frames are transmitted from the same transmitting side device at the same timing. Then, the receiving side device 20 waits for the arrival of the transmission frame from all the input systems, and then checks the communication quality by the checksum calculation or the abnormality check of the frame itself. Then, the receiving device 20 selects only the transmission frame having the highest quality, and discards other transmission frames having duplicate contents.

*** Explanation of the effect of this embodiment ***
According to the route redundancy system 100 according to the present embodiment, in a network having a redundant configuration in which a transmitting side device and a receiving side device are connected in a many-to-one or many-to-many manner, between the transmitting side device and the receiving side device. It is possible to make the communication path of the above completely redundant. Further, a general-purpose computer can be used as a data source to be transmitted to the receiving device. As a result, even if a failure occurs in a line on any communication path, a relay device such as a switch, or a transmitting device, the failure detection time and switching processing time can be minimized, as seen from the receiving device. Communication between the transmitter side and the receiver side can be continued.
In addition, compared to the case where duplicate discarding is realized by software on a general-purpose computer of the receiving side device, it is expected that the processing speed will be improved by realizing it by hardware, and as a result, the effect of improving the communication speed will be obtained. Be done.

In the above-described first embodiment, each part of each device of the route redundancy system has been described as an independent functional block. However, the configuration of each device of the route redundancy system does not have to be the configuration as in the above-described embodiment. The functional block of each device of the route redundancy system may have any configuration as long as the functions described in the above-described embodiment can be realized. Further, each device of the route redundancy system may be a system composed of a plurality of devices instead of one device.
Further, in the first embodiment, a plurality of parts may be combined and carried out. Alternatively, one part of these embodiments may be implemented. In addition, these embodiments may be implemented in any combination as a whole or partially.
That is, in the first embodiment, it is possible to freely combine each embodiment, modify any component of each embodiment, or omit any component in each embodiment.

It should be noted that the embodiments described above are essentially preferred examples and are not intended to limit the scope of the present disclosure, the scope of the application of the present disclosure, and the scope of the uses of the present disclosure. The above-described embodiment can be variously modified as needed.

10 Transmitter device, 11 Transmitter information, 13 Identification grant information, 20 Receiver device, 21 Identification information, 30 Sync server, 31 Sync signal, 40 Relay adapter, 100 Route redundancy system, 101, 201 computer, 110 Information generator , 120 identification information adder, 130 duplicate transmitter, 210 wait buffer, 220 information acquisition unit, 230 information processing unit, 500 network, 909 electronic circuit, 910 processor, 921 memory, 950 network interface.

Claims (12)

In a route redundancy system including a plurality of transmitting side devices and a plurality of receiving side devices, each of the plurality of transmitting side devices is connected to the plurality of receiving side devices via a network, and the information path is made redundant. ,
Each of the plurality of transmitting side devices
Upon receiving a synchronization signal for synchronously operating the plurality of transmitting side devices, an information generation unit that generates transmission information to be transmitted to the plurality of receiving side devices according to the synchronization signal, and an information generation unit.
An identification information adding unit that generates identification information that identifies the transmission information, attaches the identification information to the transmission information, and outputs the transmission information to which the identification information is attached as identification addition information.
It is provided with a duplicate transmission unit that duplicates the identification grant information and transmits each of the duplicated identification grant information to each of the plurality of receiving side devices.
Each of the plurality of receiving devices is
Route redundancy provided with an information acquisition unit that receives the identification-giving information transmitted from each of the plurality of transmission-side devices as a plurality of identification-giving information and acquires the transmission information based on the plurality of identification-giving information. system. The information generation unit
The transmission information is output as a plurality of transmission frames, and the transmission information is output.
The identification information giving unit is
The route redundancy according to claim 1, wherein the identification information is periodically inserted into the plurality of transmission frames as identification frames, and the plurality of transmission frames into which the identification frames are periodically inserted are output as the identification grant information. System. The identification information giving unit is
The route redundancy system according to claim 2, wherein the identification frame includes information for identifying a transmission frame output between the identification frame and an identification frame output immediately before the identification frame. The information generation unit
The transmission information is output as a plurality of transmission frames, and the transmission information is output.
The identification information giving unit is
A claim in which the identification information is embedded in a transmission frame at regular intervals among the plurality of transmission frames, and the plurality of transmission frames in which the identification information is embedded in the transmission frames at regular cycles are output as the identification imparting information. The route redundancy system according to 1. The identification information giving unit is
The transmission frame output between the transmission frame of the fixed cycle and the transmission frame of the fixed cycle output immediately before the transmission frame of the fixed cycle is identified in the transmission frame of the fixed cycle. The route redundancy system according to claim 4, wherein the information is included as the identification information. Each of the plurality of receiving devices is
A waiting buffer is provided in which a frame group consisting of the identification information and a transmission frame identified by the identification information is used as a data unit, the same data unit is waited for based on the identification information, and the same data unit that has been waited for is output. ,
The information acquisition unit
A claim for selecting a data unit from the same data unit based on the reception order of the same data unit and the reception quality of each of the same data units, and acquiring the transmission information using the selected data unit. The route redundancy system according to any one of claims 1 to 5. Each of the plurality of receiving devices is
An information processing unit that receives the transmission information from the information acquisition unit and performs information processing using the transmission information.
The route redundancy system according to claim 6, further comprising the wait buffer and a relay adapter including the information acquisition unit. The route redundancy system is
The route redundancy system according to any one of claims 1 to 7, further comprising a synchronization server that generates the synchronization signal and outputs the synchronization signal to each of the plurality of transmitting side devices. It is a transmitting side device included in a route redundancy system having a plurality of transmitting side devices and a plurality of receiving side devices and making the information path redundant, and is connected to the plurality of receiving side devices via a network. In the transmitter device
Upon receiving a synchronization signal for synchronously operating the plurality of transmitting side devices, an information generation unit that generates transmission information to be transmitted to the plurality of receiving side devices according to the synchronization signal, and an information generation unit.
An identification information adding unit that generates identification information that identifies the transmission information, attaches the identification information to the transmission information, and outputs the transmission information to which the identification information is attached as identification addition information.
A transmitting side device including a duplicate transmitting unit that duplicates the identification-giving information and transmits each of the duplicated identification-giving information to each of the plurality of receiving-side devices. It is a receiving side device included in a route redundancy system that includes a plurality of transmitting side devices and a plurality of receiving side devices and makes the information path redundant, and is connected to the plurality of transmitting side devices via a network. In the receiving device
Each of the plurality of transmitting side devices
Upon receiving a synchronization signal for synchronously operating the plurality of transmitting side devices, an information generation unit that generates transmission information to be transmitted to the plurality of receiving side devices according to the synchronization signal, and an information generation unit.
An identification information adding unit that generates identification information that identifies the transmission information, attaches the identification information to the transmission information, and outputs the transmission information to which the identification information is attached as identification addition information.
It is provided with a duplicate transmission unit that duplicates the identification grant information and transmits each of the duplicated identification grant information to each of the plurality of receiving side devices.
The receiving device is
A receiving side device provided with an information acquisition unit that receives the identification-giving information transmitted from each of the plurality of transmitting-side devices as a plurality of identification-giving information and acquires the transmission information based on the plurality of identification-giving information. .. A route redundancy system that includes a plurality of transmitting side devices and a plurality of receiving side devices, and each of the plurality of transmitting side devices is connected to the plurality of receiving side devices via a network to make the information path redundant. In the route redundancy method
When each information generator of the plurality of transmitting side devices receives a synchronization signal for synchronously operating the plurality of transmitting side devices, the transmission information to be transmitted to the plurality of receiving side devices according to the synchronization signal. To generate,
Each of the identification information adding units of the plurality of transmitting side devices generates identification information for identifying the transmission information, attaches the identification information to the transmission information, and identifies the transmission information to which the identification information is attached. Output as grant information,
Each duplication transmission unit of each of the plurality of transmitting side devices duplicates the identification-giving information, and each of the duplicated identification-giving information is transmitted to each of the plurality of receiving-side devices.
Each information acquisition unit of the plurality of receiving side devices receives the identification-giving information transmitted from each of the plurality of transmitting-side devices as a plurality of identification-giving information, and the identification-giving information is based on the plurality of identification-giving information. Route redundancy method for acquiring transmission information. A route redundancy system that includes a plurality of transmitting side devices and a plurality of receiving side devices, and each of the plurality of transmitting side devices is connected to the plurality of receiving side devices via a network to make the information path redundant. In the route redundancy program
When a synchronization signal for operating the plurality of transmitting side devices in synchronization is received, an information generation process for generating transmission information to be transmitted to the plurality of receiving side devices according to the synchronization signal is performed.
Identification information imparting processing that generates identification information that identifies the transmission information, attaches the identification information to the transmission information, and outputs the transmission information to which the identification information is attached as identification assignment information.
A duplicate transmission process of duplicating the identification-giving information and transmitting each of the duplicated identification-giving information to each of the plurality of receiving devices.
The computer is made to execute an information acquisition process of receiving the identification-giving information transmitted from each of the plurality of transmitting side devices as a plurality of identification-giving information and acquiring the transmission information based on the plurality of identification-giving information. Route redundancy program.

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