JP2017146659A - Data transmission device, data reception device, data transmission method, data reception method, data transmission program, and data reception program - Google Patents

Abstract

PROBLEM TO BE SOLVED: To allow a reception side to update data even if the data format of a transmission side data is different from the data format of a reception side data.SOLUTION: A reception side computer 8 can convert CDR (Common Data Representation) data into structure data. In a transmission side computer 7, a difference data generation unit 2 generates difference data corresponding to the structure data held by the reception side computer 8 by CDR data. A communication unit 13 transmits the difference data generated by the difference data generation unit 2 to the reception side computer 8.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a technique for transmitting / receiving differential data.

  The conventional differential data communication method of Patent Document 1 includes a processing unit that compresses and decompresses data, and compares a data area to be transmitted this time with a previous data area when a similar data pattern is repeatedly communicated. The amount of communication is reduced by transmitting only the data whose value has changed. More specifically, in the method of Patent Document 1, transmission data is created by combining the offset (data position) from the beginning of the entire data area to be communicated and the changed data value, and this transmission data is transmitted. The amount of communication is reduced.

  Further, in the method of Patent Document 2 which is another conventional difference data communication method, a difference means for taking the difference between the immediately preceding data with respect to the time series observation data is provided. In the method of Patent Document 2, the difference data is classified according to the value of the difference data, and the difference data, and the difference data is replaced with a specific bit pattern. Performs data compression that matches the characteristics.

JP-A-8-286889 JP 2007-28105 A

The conventional differential data communication method has a problem that data cannot be updated on the receiving side when the data format of the data held on the transmitting side and the receiving side is different.
In other words, even if the transmission side takes the difference of the data on the transmission side and the difference data for notifying the difference is transmitted to the reception side, the data format of the reception side data is different. There is a problem that it cannot be updated.

  The main object of the present invention is to solve such a problem, and it is possible to update data on the receiving side even when the data format of the data on the transmitting side is different from the data format of the data on the receiving side. The main purpose.

A data transmission apparatus according to the present invention is as follows.
A differential data generation unit that generates, as CDR data, differential data for structure data held by a data receiving apparatus capable of converting from CDR (Common Data Representation) data to structure data;
A communication unit that transmits the difference data generated by the difference data generation unit to the data receiving device.

  According to the present invention, since the difference data that is the CDR data is transmitted, the data receiving apparatus can update the data using the difference data.

1 is a diagram illustrating a configuration example of a communication system according to Embodiment 1. FIG. FIG. 5 shows an example of structure data according to the first embodiment. FIG. 4 is a diagram illustrating an example of structure data to be transmitted according to the first embodiment. FIG. 6 shows an example of CDR data to be transmitted according to the first embodiment. FIG. 6 is a diagram illustrating an example of CDR data held by a transmission data holding unit and an example of structure data held by a reception data holding unit according to the first embodiment. FIG. 4 is a diagram illustrating an example of a difference information data group according to the first embodiment. FIG. 4 is a diagram illustrating an operation example in a transmission computer according to the first embodiment. FIG. 3 is a diagram illustrating an example of a reset data buffer according to the first embodiment. FIG. 5 shows an example of an assignment data buffer according to the first embodiment. FIG. 6 shows an example of reset data according to the first embodiment. FIG. 4 is a diagram illustrating an example of substitution data according to the first embodiment. FIG. 6 shows an example of data obtained by an AND operation according to the first embodiment. FIG. 4 is a diagram illustrating an example of data obtained by an OR operation according to the first embodiment. FIG. 3 is a diagram illustrating an operation example of the reception-side computer according to the first embodiment. FIG. 3 is a diagram illustrating an operation example of the reception-side computer according to the first embodiment. FIG. 10 is a diagram illustrating an example of a data format of data held by a transmission data holding unit according to the second embodiment. FIG. 10 is a diagram illustrating an example of CDR data held by a transmission data holding unit according to the second embodiment. FIG. 10 is a diagram illustrating an example of a difference information data group according to the second embodiment. The figure which shows the operation example of the transmission side computer which concerns on Embodiment 2. FIG. The figure which shows the example of the structure data which the reception data holding part which concerns on Embodiment 2 hold | maintains. FIG. 9 shows a configuration example of a communication system according to a third embodiment. FIG. 10 shows an example of an operator identification table according to the third embodiment. FIG. 10 is a diagram illustrating an example of structure data and an example of a structure information table according to the third embodiment. FIG. 10 is a diagram illustrating an example of structure data to be transmitted according to the third embodiment. FIG. 10 is a diagram illustrating an example of CDR data to be transmitted according to the third embodiment. FIG. 10 is a diagram illustrating an example of CDR data held by a transmission data holding unit according to the third embodiment. FIG. 10 is a diagram illustrating an operation example of a transmission side computer according to the third embodiment. FIG. 10 is a diagram illustrating an example of a calculation data buffer according to the third embodiment. FIG. 10 is a diagram illustrating an operation example of the reception-side computer according to the third embodiment. FIG. 10 is a diagram illustrating an operation example of the reception-side computer according to the third embodiment. The figure which shows the example of the structure data obtained with the receiving side computer which concerns on Embodiment 3. FIG. FIG. 3 is a flowchart showing an operation example of a transmission side computer according to the first embodiment. FIG. 3 is a flowchart showing an operation example of the receiving computer according to the first embodiment. FIG. 9 is a flowchart showing an operation example of a transmission side computer according to the second embodiment. FIG. 9 is a flowchart showing an operation example of the receiving computer according to the second embodiment. FIG. 9 is a flowchart showing an operation example of a transmission side computer according to the third embodiment. FIG. 9 is a flowchart showing an operation example of a receiving computer according to the third embodiment. FIG. 3 is a diagram illustrating a hardware configuration example of a transmission side computer and a reception side computer according to the first embodiment.

Embodiment 1 FIG.
*** Explanation of configuration ***
FIG. 1 shows a configuration example of a communication system according to the present embodiment.
As shown in FIG. 1, a transmission side computer 7 and a reception side computer 8 are connected by a network 9.
The transmission side computer 7 transmits the difference data, and the reception side computer 8 receives the difference data transmitted from the transmission side computer 7 and updates the data.
The transmission side computer 7 corresponds to an example of a data transmission device, and the reception side computer 8 corresponds to an example of a data reception device.
The network 9 is a communication path that connects the transmission side computer 7 and the reception side computer 8, and is, for example, Ethernet (registered trademark).
The transmission side computer 7 includes a transmission data conversion unit 1, a difference data generation unit 2, a transmission data holding unit 3, a control unit 12, a communication unit 13, and a storage unit 14 as functional configurations. The reception-side computer 8 includes a reception data holding unit 4, a data reception unit 5, a reception data conversion unit 6, a control unit 12, a communication unit 13, and a storage unit 14 as functional configurations.
Details of each component will be described later.

FIG. 38 shows a hardware configuration example of the transmission side computer 7 and the reception side computer 8.
Both the transmission side computer 7 and the reception side computer 8 include a processor, a storage device, and a communication device as hardware.
A program for realizing the functions of the transmission data conversion unit 1, the difference data generation unit 2, the transmission data holding unit 3, and the control unit 12 shown in FIG. 1 is stored in the storage device of the transmission side computer 7.
Then, the processor of the transmission side computer 7 executes these programs, and performs operations of the transmission data conversion unit 1, the difference data generation unit 2, the transmission data holding unit 3, and the control unit 12.
FIG. 38 schematically illustrates a state in which the processor is executing a program that realizes the functions of the transmission data conversion unit 1, the difference data generation unit 2, the transmission data holding unit 3, and the control unit 12.
Further, the storage device of the receiving computer 8 stores a program for realizing the functions of the received data holding unit 4, the data receiving unit 5, the received data converting unit 6, and the control unit 12 shown in FIG.
Then, the processor of the reception side computer 8 executes these programs, and performs operations of the reception data holding unit 4, the data reception unit 5, the reception data conversion unit 6, and the control unit 12.
FIG. 38 schematically illustrates a state in which the processor is executing a program that implements the functions of the reception data holding unit 4, the data reception unit 5, the reception data conversion unit 6, and the control unit 12.
The processor is a CPU (Central Processing Unit), a DSP (Digital Signal Processor), or the like.
The storage device is a RAM (Random Access Memory), a ROM (Read Only Memory), a flash memory, an HDD (Hard Disk Drive), or the like.
The communication device is a communication chip or a NIC (Network Interface Card).
1 is realized by a storage device, and the communication device 13 is realized by a communication device.

  Next, components of the transmission side computer 7 shown in FIG. 1 will be described.

  The transmission data conversion unit 1 converts structure data into CDR (Common Data Representation) data. Further, the transmission data conversion unit 1 stores the converted CDR data in the transmission buffer.

The transmission data holding unit 3 holds CDR data created by the transmission data conversion unit 1 and transmitted to the receiving computer 8 (hereinafter referred to as transmitted data). The transmission data holding unit 3 passes the transmitted data to the difference data generation unit 2 when the difference data generation unit 2 creates the difference data. In the present embodiment, the transmission data holding unit 3 holds only one transmitted data that has been transmitted most recently.
Note that the transmitted data held in the transmission data holding unit 3 is CDR data to which difference data is transmitted. As will be described later, the transmission side computer 7 extracts the difference between the latest CDR data and the previous CDR data, and transmits the difference data for notifying the extracted difference to the reception side computer 8. It does not send itself. In the transmission data holding unit 3, the latest CDR data to which the difference data is transmitted is held as transmitted data.
As will be described later, the reception-side computer 8 holds received structure data (hereinafter referred to as received data) in the received data holding unit 4. The received data is the same data (same value) as the transmitted data, although there is a difference in data format between structure data and CDR data.

The difference data generation unit 2 obtains a difference between the transmitted data held by the transmission data holding unit 3 and the latest CDR data to be transmitted. Then, the difference data generating unit 2 transmits the difference data for notifying the obtained difference to the data receiving unit 4 of the receiving computer 8 via the communication unit 13 and the network 9.
As described above, since the received data held by the received data holding unit 4 and the transmitted data held by the transmission data holding unit 3 are the same data, the difference data is the difference data with respect to the received data. But there is.
The receiving computer 8 can convert the CDR data into structure data. For this reason, even if the difference data generation part 2 produces | generates difference data with CDR data, the receiving side computer 8 can update structure data.
The operation of the difference data generation unit 2 corresponds to a difference data generation step.

  The control unit 12 of the transmission side computer 7 performs overall control of the transmission side computer 7. Specifically, the control unit 12 controls the transmission data conversion unit 1, the difference data generation unit 2, the transmission data holding unit 3, the communication unit 13, and the storage unit 14.

The communication unit 13 of the transmission side computer 7 transmits the difference data generated by the difference data generation unit 2 to the reception side computer 8 via the network 9.
The operation of the communication unit 13 of the transmission side computer 7 corresponds to a transmission step.

  The storage unit 14 of the transmission side computer 7 stores various data used by the transmission side computer 7. Specifically, the storage unit 14 of the transmission-side computer 7 stores a value used for calculation of the transmission data conversion unit 1 and a calculation result of the transmission data conversion unit 1. In addition, the storage unit 14 of the transmission-side computer 7 stores values used for the calculation of the difference data generation unit 2 and the calculation result of the difference data generation unit 2. The storage unit 14 of the transmission side computer 7 also functions as a transmission buffer.

  Next, components of the receiving computer 8 will be described.

The received data holding unit 4 holds received data. In the present embodiment, the received data holding unit 4 holds only one latest received data.
The received data is structure data restored from the difference data.

  When the data reception unit 5 receives the difference information data group via the communication unit 13, the data reception unit 5 creates two data necessary for reconstructing the latest data from the difference information data group and the received data.

The reception data conversion unit 6 restores the data before the CDR conversion by the transmission data conversion unit 1 using the two data created by the data reception unit 5 and the received data held by the reception data holding unit 4.
The data reception unit 5 and the reception data conversion unit 6 cooperate to update the structure data using the difference data received by the communication unit 13, and correspond to an example of a data update unit. The operations of the data reception unit 5 and the reception data conversion unit 6 correspond to a data update step.

  The control unit 12 of the reception side computer 8 controls the entire reception side computer 8. Specifically, the control unit 12 controls the reception data holding unit 4, the data reception unit 5, the reception data conversion unit 6, the communication unit 13, and the storage unit 14.

The communication unit 13 of the receiving computer 8 receives the difference data from the network 9.
The operation of the communication unit 13 of the receiving computer 8 corresponds to a receiving step.

  The storage unit 14 of the receiving computer 8 stores various data used by the receiving computer 8. Specifically, the storage unit 14 of the reception-side computer 8 stores a value used for the calculation of the data reception unit 5 and the calculation result of the data reception unit 5. In addition, the storage unit 14 of the reception-side computer 8 stores a value used for the calculation of the reception data conversion unit 6 and the calculation result of the reception data conversion unit 6. The storage unit 14 of the receiving computer 8 also functions as a reset data buffer and an assignment data buffer.

In the present embodiment, the transmitting side computer 7 converts the latest structure data into CDR data, generates difference data for notifying the difference in the CDR data as CDR data, and the receiving side computer 8 uses the difference data, Restore the latest structure data.
If the structure data of the transmission side computer 7 and the structure data of the reception side computer 8 are different in version, the transmission side computer 7 takes the difference with the structure data and sends the structure data to the reception side computer 8. Even if the difference is notified, the data cannot be updated by the receiving computer 8 due to the version difference. In the present embodiment, in view of such circumstances, the structure data is converted into CDR data by the transmission side computer 7 and the difference is notified to the reception side computer 8 by the CDR data.

*** Explanation of operation ***
Next, the operation of the communication system according to the present embodiment will be described using an example.
FIG. 2 shows the format of the structure data before CDR conversion by the transmission side computer 7.
In this embodiment, it is assumed that the transmission data conversion unit 1 of the transmission side computer 7 converts the structure data to be transmitted shown in FIG. 3 into CDR data.
FIG. 4 shows the CDR data to be transmitted obtained by the conversion by the transmission data conversion unit 1.
FIG. 5A shows transmitted data (CDR data) held in the transmission data holding unit 3. FIG. 5B shows the transmitted data held in the received data holding unit 4. The transmitted data in FIG. 5A and the received data in FIG. 5B have the same data value, although the data formats are different.

When the transmission data converter 1 obtains the structure data to be transmitted shown in FIG. 3 from a data source not shown in FIG. 1, the transmission data converter 1 performs CDR conversion and places the CDR data in FIG. 4 in the transmission buffer.
The difference data generation unit 2 acquires the transmitted data shown in FIG. 5 from the transmission data holding unit 3, and acquires the transmission target data shown in FIG. 4 from the transmission buffer. Then, the difference data generation unit 2 compares the transmitted data and the transmission target data byte by byte.
In the example of FIGS. 5 and 4, the value of the fourth byte is changed from 0x01 to 0x02, and the value of the fifth byte is changed from 0x61 (character “a” ASCII code) to 0x62 (character “b” ASCII code). You can see that
The difference data generation unit 2 creates 4-byte data for transmitting this information every time different 1-byte data exists.
Hereinafter, this 4-byte data is called “difference information data”, and a combination of the difference information data is called a “difference information data group”. The difference information data group is difference data for notifying the difference between the transmission target data and the transmitted data. In other words, the difference information data notifies the update position and the update value in the structure data held by the reception data holding unit 4.
The offset from the head address where different 1-byte data is located is stored in the first 2 bytes of the 4-byte difference information data, and a value to be newly transmitted is stored in the last 1 byte after 1 byte.
In the case of this example, the difference data generation unit creates 0x00, 0x04, 0x00, and 0x02 as difference information data indicating that the value of the fourth byte is different, and difference information data indicating that the value of the fifth byte is different Are created as 0x00, 0x05, 0x00, and 0x62.
FIG. 6 shows a difference information data group created by the difference data generation unit 2.
Thereafter, the difference data generation unit 2 transmits the difference information data group to the receiving computer 8 via the communication unit 13 and the network 9.

  FIG. 7 is a conceptual diagram showing a series of operations in the transmission side computer 7.

In the receiving computer 8, the data receiving unit 5 receives the difference information data group via the communication unit 13.
When receiving the difference information data group, the data receiving unit 5 prepares two buffers to restore the structure data shown in FIG.
These two buffers are called a reset data buffer and an assignment data buffer.
The data receiving unit 5 first sets the data of all bytes of the reset data buffer to 0xff, and then reads the data of the differential information data group in units of the differential information data.
In this example, since the first two bytes of the first difference information data are 0x00 and 0x04, the data receiving unit 5 sets the fourth byte data of the reset data buffer to 0x00. Similarly, since the first two bytes of the second difference information data are 0x00 and 0x05, the fifth byte of the reset data buffer is set to 0x00. The state of the reset data buffer after this operation is as shown in FIG.
Next, the data receiving unit 5 reads all the bytes of the substitution data buffer as 0x00, and then reads out the data of the difference information data group in units of the difference information data. In this example, since the first 2 bytes of the first difference information data are 0x00, 0x04, and the 4th byte are 0x02, the data receiving unit 5 sets the 4th byte data of the substitution data buffer to 0x02. . Similarly, since the first two bytes of the second difference information data are 0x00, 0x05, and the fourth byte data 0x62, the fifth byte data of the reset data buffer is set to 0x62. The state of the substitution data buffer after this operation is as shown in FIG.
Then, the data reception unit 5 passes the reset data buffer and the substitution data buffer to the reception data conversion unit 6.

When receiving the two buffers, the reception data converting unit 6 restores the data as data of the structure shown in FIG. When the reset data buffer shown in FIG. 8 is restored to the structure shown in FIG. 2, the data shown in FIG. 10 is obtained. This data is called reset data. Further, when the substitution data buffer shown in FIG. 9 is restored to the structure shown in FIG. 2, the data shown in FIG. 11 is obtained. This data is called substitution data.
The received data conversion unit 6 acquires the received data held by the received data holding unit 4 and performs an AND operation between the received data and the reset data in units of members of each structure. Data obtained as a result of the AND operation is shown in FIG. Further, the reception data conversion unit 6 performs an OR operation between the data of FIG. 12 and the data of FIG. The data obtained as a result is shown in FIG. 13, and this data coincides with the data (FIG. 3) that the transmission side computer 7 is trying to transmit.
As described above, the reception data conversion unit 6 updates the structure data held in the reception data holding unit 4 by using the update position and the update value notified in the difference information data group.

14 and 15 are conceptual diagrams showing a series of operations in the reception-side computer 8.
FIG. 14 shows a process in which the data receiving unit 5 stores data in the reset data buffer and the substitution buffer and creates the reset data and the substitution data. On the other hand, FIG. 15 shows a process of restoring data (FIG. 3) from the transmission side computer 7 using the reset data and the substitution data.

Next, an operation example of the transmission side computer 7 in the present embodiment will be described with reference to the flowchart of FIG.
The operation procedure shown in FIG. 32 corresponds to an example of a data transmission method and a data transmission program.

In step S <b> 1, the transmission data conversion unit 1 performs CDR conversion on the transmission data and passes the CDR data to the difference data generation unit 2.
In step S <b> 2, the difference data generation unit 2 acquires transmitted data that the transmission data holding unit 3 has.
In step S4, the difference data generation unit 2 compares the data after CDR conversion with the transmitted data received from the transmission data holding unit 3 with 1-byte data having the same offset from the head.
If the values are different, the difference data generation unit 2 creates difference information data and adds it to the difference information data group in step S6. The difference data generation unit 2 performs the processing from step S4 to step S6 for all the data after the CDR conversion. After all the data has been processed, the process proceeds to step S7.
In step S <b> 7, the difference data generation unit 2 sends the difference information data group to the data reception unit 5 via the communication unit 13.

Next, the operation of the reception side computer 8 after the difference data generation unit 2 transmits data to the data reception unit 5 in step S7 in the present embodiment will be described with reference to the flowchart of FIG.
The operation procedure shown in FIG. 33 corresponds to an example of a data reception method and a data reception program.

In step S8, the data receiving unit 5 waits for the difference information data group from the difference data generating unit 2, and when receiving the difference information data group, in step S9, the data receiving unit 5 prepares a substitution data buffer, All data in the data buffer is set to 0x00.
In step S11, the data receiving unit 5 reads the difference information data from the difference information data group, and sets the 1-byte value of the offset written in the difference information data as the value of the difference information data. This is performed for all the difference information data in the difference information data group.
In step S12, the data receiving unit 5 prepares a reset data buffer, and sets all data in the reset data buffer to 0xff.
In step S14, the data receiving unit 5 reads the difference information data from the difference information data group, and sets the 1-byte value of the offset written in the difference information data to 0. This is performed for all the difference information data in the difference information data group.
In step S <b> 15, the data reception unit 5 passes the substitution data buffer and the reset data buffer to the reception data conversion unit 6.
In step S16, the reception data converter 6 creates substitution data and reset data from the substitution data buffer and the reception data buffer, respectively.
In step S <b> 17, the received data conversion unit 6 acquires received data from the received data holding unit 4, and performs AND operation of the reset data and received data, AND operation result, and substitution for each member of the structure. An OR operation with the data is performed to restore the transmission data.

*** Explanation of the effect of the embodiment ***
As described above, in this embodiment, when the sending computer has CDR-converted data and the receiving computer holds structure data, if all structure data is sent, 16-byte data Although transmission is necessary, when the difference data is transmitted, only 8 bytes are required. Therefore, the reception side computer can restore and acquire the transmission data with less data.
Further, even if the data formats held on the transmission side and the reception side are different, it is possible to restore the values of the transmission data without changing the held data.

Embodiment 2. FIG.
In the first embodiment, an example has been described in which difference data is created when only one data is held in each of the transmission data holding unit and the reception data holding unit.
In the present embodiment, an example will be described in which difference data is created when a transmission data holding unit and a reception data holding unit each hold a plurality of data.
In the present embodiment, it is assumed that the transmission data holding unit and the reception data holding unit hold a plurality of the same data.
Hereinafter, differences from the first embodiment will be mainly described. Matters not described below are the same as those in the first embodiment.

*** Explanation of configuration ***
A configuration example of a communication system according to the present embodiment is as shown in FIG. Also, an example of the functional configuration of the transmission side computer 7 and an example of the functional configuration of the reception side computer 8 are as shown in FIG. Further, a hardware configuration example of the transmission side computer 7 and a hardware configuration example of the reception side computer 8 are as shown in FIG.
In the present embodiment, it is assumed that a sequence number for uniquely determining data is given to data held by the transmission data holding unit 3.
FIG. 16 shows the format of data held by the transmission data holding unit 3 in the present embodiment. In the figure, data 0x00, 0x00, 0x00, and 0x09 surrounded by an upper square frame indicate the sequence numbers of the data, and the data in this example means the ninth data. In the figure, the data enclosed by the lower square frame is obtained by CDR conversion of the original structure data.

*** Explanation of operation ***
Next, the operation of the communication system according to the present embodiment will be described using an example.
Also in this embodiment, it is assumed that the difference data of the CDR data after the CDR conversion of the structure data in the format shown in FIG. 2 is transmitted from the transmission side computer 7 to the reception side computer 8.
In the present embodiment, it is assumed that the transmission data holding unit 3 holds the CDR data shown in FIG. 17 as the transmitted data. In the example of FIG. 17, it means that the transmitted data of sequence numbers 7, 8, and 9 are held in order from the left.
Also in this example, it is assumed that the transmission side computer 7 is going to transmit the data shown in FIG. Similar to the first embodiment, the transmission data conversion unit 1 converts the data shown in FIG. 3 into the CDR format to generate the CDR data in FIG. 4, and arranges the CDR data in FIG. 4 in the transmission buffer. 2 acquires all the transmitted data that the transmission data holding unit 3 has. In this example, three pieces of data shown in FIG. 17 are acquired.
In the present embodiment, unlike the first embodiment, the difference data generation unit 2 compares all the acquired data with the data shown in FIG. 4 one byte at a time and creates a difference information data group.
The difference information data group in this example is shown in FIG. The left end of FIG. 18 is a difference information data group when the data of sequence number 7 and the data of FIG. 4 are compared. The center of FIG. 18 is a difference information data group when the data of sequence number 8 and the data of FIG. 4 are compared. The right end of FIG. 18 is a difference information data group when the data of sequence number 9 and the data of FIG. 4 are compared. In the example of FIG. 18, it can be seen that the difference information data (right end) when compared with the sequence number 9 has the smallest data size.
The difference data generation unit 2 transmits the difference information data group obtained by comparing the transmitted data with the sequence number 9 to the data reception unit 5.
FIG. 19 is a conceptual diagram showing a series of operations in the above transmission side computer.

When the data reception unit 5 receives the difference information data group, the reception data conversion unit 6 creates reset data and substitution data by the same method as in the first embodiment. Then, the reception data conversion unit 6 acquires from the reception data holding unit 4 the structure data having the sequence number in the first 4 bytes of the difference information data group. As described above, the reception data holding unit 4 holds the received data obtained by converting the data held in the transmission data holding unit 3 into the structure format. In this embodiment, the data of the sequence numbers 7, 8, and 9 are stored. Stored as structure data.
FIG. 20 shows received data held by the received data holding unit 4. In the present embodiment, the reception data holding unit 4 passes the lowest received data in FIG. 20 to the reception data conversion unit 6.
The reception data conversion unit 6 performs AND on the received data that is obtained from the reception data holding unit 4 and matches the sequence number of the difference information data group with the reset data in units of members of each structure. Perform the operation. Then, by performing an OR operation between the data obtained as a result of the AND operation and the substitution data with the members of each structure as a unit, the data transmitted by the transmitting computer 7 can be restored. it can.

  Next, an operation example in the transmission side computer 7 in the present embodiment will be described with reference to the flowchart of FIG.

In step S <b> 101, the transmission data conversion unit 1 performs CDR conversion on the transmission data and passes the CDR data to the difference data generation unit 2.
In step S <b> 102, the difference data generation unit 2 acquires all the transmitted data that the transmission data holding unit 3 has.
In step S104, the difference data generation unit 2 performs S3 to S6 in FIG. 32 for one piece of transmitted data. Step S104 is performed for all transmitted data.
In step S <b> 105, the difference data generation unit 2 transmits the difference information data group having the smallest size in the difference information data group of each transmitted data to the data reception unit 5.

  Next, an operation example of the receiving computer 8 in this embodiment will be described with reference to the flowchart of FIG.

In step S106, S9 to S16 of FIG. 33 are performed.
In step S107, the reception data conversion unit 6 acquires the data of the sequence number indicated in the received difference information data group from the reception data holding unit 4, and sets the reset data to each member of the structure. An AND operation and an OR operation with substitution data are performed to restore the transmission data.

*** Explanation of the effect of the embodiment ***
As described above, in the present embodiment, when a plurality of transmitted data and received data are held by the transmission data holding unit and the received data holding unit, the data difference is the largest among the held data. Difference information data is created from the smaller data. As a result, transmission data can be restored with smaller difference information data than in the first embodiment.
In the present embodiment, an example is shown in which the transmission data holding unit 3 and the reception data holding unit 4 hold the same data. However, for example, data that can be held in advance by the reception data holding unit 4 When the number of data that can be held by the transmission data holding unit 3 is different from the number of data that can be held by the reception data holding unit 4 in advance, The difference information data group can be sent for data with a small data size of the difference information data group.

Embodiment 3 FIG.
In the first and second embodiments, values are compared byte by byte, and different data offsets and values are transmitted.
In the present embodiment, when the transmission data can be restored by performing some calculation with the data held by the reception data holding unit in the reception side computer, the calculation method and the calculation target data are transmitted. Thus, a method for restoring transmission data will be described.
In the present embodiment, the transmission data holding unit and the reception data holding unit hold the latest transmitted data and received data, respectively.
Hereinafter, differences from the first embodiment will be mainly described. Matters not described below are the same as those in the first embodiment.

*** Explanation of configuration ***
FIG. 21 shows a configuration example of a communication system according to the third embodiment.
In this embodiment, an operator identification table 10 and a structure information table 11 are added to both the transmission side computer 7 and the reception side computer 8.
Components other than the operator identification table 10 and the structure information table 11 are the same as those shown in FIG.
In addition, the hardware configuration example of the transmission-side computer 7 and the hardware configuration example of the reception-side computer 8 according to the present embodiment are the same as those shown in FIG.

A configuration example of the operator identification table 10 is shown in FIG. In FIG. 22, only addition, subtraction, multiplication, and division are shown as calculation contents, but 256 calculations of 0x00 to 0xff can be defined.
An example of the structure information table 11 is shown in FIG. The structure information table 11 stores the data size of each member of the structure and the number of elements in the array. If the member is not an array, 1 is described.

*** Explanation of operation ***
Next, the operation in the present embodiment will be described using an example.
Also in this embodiment, it is assumed that the difference data of the CDR data after the CDR conversion of the structure data in the format shown in FIG. 2 is transmitted from the transmission side computer 7 to the reception side computer 8.
In this embodiment, the data transmitted by the transmission side computer 7 is shown in FIG.
The transmission data converter 1 converts the data shown in FIG. 24 into the CDR format to generate the CDR data in FIG. 25, and arranges the CDR data in FIG. 25 in the transmission buffer.
Further, it is assumed that the transmission data holding unit 3 holds the data shown in FIG. 26 as the transmitted data.
The difference data generation unit 2 acquires the data illustrated in FIG. 25 from the transmission buffer, acquires the transmitted data illustrated in FIG. 26 from the transmission data holding unit 3, and compares the data.
In the present embodiment, the comparison of data refers to the entries in the structure information table 11 in order from the first entry, and when the member size is 1, if the member size is 1, it is the same as in the first embodiment and is greater than 1. Is compared by the size shown in the table entry. In this example, since the first entry is 4, the 4 bytes 0x00000100 from the top of the data in FIG. 25 and the 4 bytes 0x000000ff from the top of the data in FIG. 26 are compared as 4-byte numerical values. As a comparison method, the calculation methods defined in 0x01 to 0xff in the operator identification table 10 are tried in order. In this example, the difference data generation unit 2 first refers to 0x01 in the operator identification table 10 and investigates whether or not 0x00000000 is obtained when any 1-byte value is added to 0x000000ff. In the case of this example, 0x01 is added to 0x000000ff to become 0x00000100. In this way, the difference data generation unit 2 creates difference information data when the compared data matches by performing the calculation shown in the operator identification table 10 using the 1-byte value as the operation target data.
In this embodiment, the first 2 bytes are the entry number of the structure information table 11 that has been compared, the next 1 byte is the number of the operation that matches the two data in the operator identification table 10, and the last 1 Stores the operand data for matching data in the byte. In this example, since the first entry is matched by adding 0x01, the difference information data for the first 4 bytes of data is 0x00010101. Then, the difference data generation unit 2 shifts the pointer of the transmission data buffer after the CDR conversion and the data buffer pointer of the transmission data holding unit 3 by 4 bytes. Then, the difference data generation unit 2 refers to the next entry in the structure information table 11, and the value of the next entry is 1. Therefore, the difference data generation unit 2 performs comparison using the method of the first embodiment. Then, in addition to the 1 byte that is the value of the reference entry of the structure information table 11, the pointer of the transmission data buffer after the CDR conversion and the data buffer pointer of the transmission data holding unit are 3 bytes according to the CDR conversion rule. Skip to the next entry in the structure information table 11. Since the value of the next entry is 4, the difference data generation unit 2 compares 4-byte data. In this example, since the data is the same, nothing is done, and the pointer of the buffer of the transmission data after CDR conversion and the pointer of the buffer of the data held by the transmission data holding unit 3 are shifted by 4 bytes. And since the last value of the structure information table 11 is 2, the difference data generation part 2 compares 2 bytes. Here, since the transmission data is 0xfffe and the data held by the transmission data holding unit 3 is 0xffff, the calculation methods defined in 0x01 to 0xff of the operator identification table 10 are tried in order. In this example, 0xffffe is obtained by subtracting 1 from 0xffff. Therefore, the difference data generation unit 2 creates difference information data. Here, since transmission data is obtained by subtracting 0x01 for the fourth entry of the structure information table 11, the difference information data is 0x00040201. The difference data generation unit 2 creates a difference information data group using this value and 0x00010101 obtained previously as a set, and sends the difference information data group to the reception data processing unit 5.
As described above, in the present embodiment, the difference data generation unit 2 notifies the update position, the calculation method for obtaining the update value, and the operation value in the structure data held by the receiving computer 8. An information data group is generated and transmitted to the receiving computer 8.
An outline of the processing so far is shown in FIG.

When the data receiving unit 5 receives the difference information data group, the data receiving unit 5 prepares an operation data buffer and writes the data into the buffer.
The data receiving unit 5 first sets all bytes of the operation data buffer to 0x00. Next, the data receiving unit 5 reads the difference information data as a unit, and creates operation data while referring to the structure information table. In this example, first, the first difference information data 0x00010101 is referred to, and from the first 2 bytes 0x0001, it is recognized that the information of the difference information data is the value of the first structure data. By referring, the operation type is added, and it is recognized that the operation data is 1 in the fourth byte. The data receiving unit 5 prepares a buffer for storing operation data, and stores 0x00000001 in the first 4 bytes. When the next difference information data is referenced, since the second and third structure members are skipped from the first 2 bytes 0x0004, the write position of the operation data in the buffer according to the CDR rules for that member. To skip. In this case, since the second data is 1 byte and the third data is 4 bytes, 8 bytes are skipped. Since the next 1 byte of the difference information data is 2, the data receiving unit 5 recognizes that the operation data is subtraction, and since the last 1 byte is 1, the operation data is 1 Recognize that. Since the structure data is 2 bytes, 2 byte data: 0x0001 is written from the buffer position. The operation data buffer created by the data receiving unit 5 is as shown in FIG.
The reception data converter 6 receives the operation data buffer, and restores the data as data of the structure shown in FIG. When the data in the buffer shown in FIG. 28 is restored, the data shown in FIG. 29 is obtained. This data is used as operation data.
The reception data conversion unit 6 acquires data held by the reception data holding unit 4 and performs calculation with each component of the calculation target data. Since the difference information data group indicates addition for the first structure member and subtraction for the fourth structure member, 1 of the data held by the reception data holding unit 4 The value of int_data1 that is the first member is incremented by 1, and the data of short_data that is the fourth member is decremented by 1.
29 and 30 are conceptual diagrams showing a series of processes after the data receiving unit 5 receives the difference information data group. Further, the value obtained by this is shown in FIG. 31, which matches the data to be sent by the transmission side computer 7.

  Next, an operation example of the transmission side computer 7 in this embodiment will be described with reference to the flowchart of FIG.

In step S201, step S1 in FIG. 32 is performed, in step S202, step S2 in FIG. 32 is performed, and in step S203, step S3 in FIG. 32 is performed.
In step S204, the difference data generation unit 2 indicates data of the same offset between the data after CDR conversion and the data received from the transmission data holding unit 3, in the entry indicated by S209 in the structure information table. Compare only the number of sizes. If the values are different, the difference data generation unit 2 obtains a calculation method and data to be calculated so that the data of the size matches. If there is such a calculation method and data to be calculated, the difference data generation unit 2 creates difference information data and merges it into the difference information data group in step S208.
In step S209, the difference data generation unit 2 offsets the pointer of the data after the CDR conversion and the data of the transmission data holding unit 3 by the number of bytes indicated in the entry shown in step S209 of the structure information table. And the offset of the pointer is shifted according to the CDR rules.
In step S210, the difference data generation unit 2 changes the reference entry so as to refer to the next entry in the structure information table in the next processing of S208, and when the comparison has been completed for all the data, step S211 Proceed to
In step S <b> 211, the difference data generation unit 2 transmits the difference information data group to the data reception unit 5.
In step S207, if the transmitted data does not become the data after the CDR conversion no matter how the calculation is performed, difference information data is created by the method of the first embodiment.

  Next, an operation example of the receiving computer in this embodiment will be described with reference to the flowchart of FIG.

In step S212, steps S8 to S16 in FIG. 33 are performed.
In step S213, the reception data conversion unit 6 acquires data from the reception data holding unit 4, and obtains transmission data for each member of the structure using the calculation method and the calculation target data indicated in the difference information data group. .
That is, the reception data conversion unit 6 updates the structure data using the update position, the calculation method, and the operation value notified by the difference information data group.

*** Explanation of the effect of the embodiment ***
Thus, in the present embodiment, the difference information data group can be created with a smaller size compared to the case where the data is compared in units of 1 byte in the first and second embodiments.

As mentioned above, although embodiment of this invention was described, you may implement in combination of 2 or more among these embodiment.
Alternatively, one of these embodiments may be partially implemented.
Alternatively, two or more of these embodiments may be partially combined.
In addition, this invention is not limited to these embodiment, A various change is possible as needed.
*** Explanation of hardware configuration ***
Finally, a supplementary description of the hardware configuration shown in FIG. 38 will be given.
An OS (Operating System) is also stored in the storage device of FIG.
At least a part of the OS is executed by the processor.
When the processor executes the OS, task management, memory management, file management, communication control, and the like are performed.
In FIG. 38, one processor is illustrated in the transmission side computer 7 and the reception side computer 8, but the transmission side computer 7 and the reception side computer 8 may include a plurality of processors.
A program for realizing the functions of the transmission data conversion unit 1, the difference data generation unit 2, the transmission data holding unit 3, the reception data holding unit 4, the data reception unit 5, the reception data conversion unit 6, and the processing unit 12 is a magnetic disk. Further, the program may be stored in a portable storage medium such as a flexible disk, an optical disk, a compact disk, a Blu-ray (registered trademark) disk, or a DVD.
Further, the transmission side computer 7 and the reception side computer 8 may be implemented by a logic IC (Integrated Circuit), GA (Gate Array), ASIC (Application Specific Integrated Circuit), or FPGA (Field-Programmable Gate Array). Good.
The processor and the electronic circuit are also collectively referred to as a processing circuit.

  DESCRIPTION OF SYMBOLS 1 Transmission data conversion part, 2 Difference data generation part, 3 Transmission data holding part, 4 Reception data holding part, 5 Data reception part, 6 Reception data conversion part, 7 Transmission side computer, 8 Reception side computer, 9 Network, 10 Arithmetic Child identification table, 11 structure information table, 12 control unit, 13 communication unit, 14 storage unit.

Claims (15)

A differential data generation unit that generates, as CDR data, differential data for structure data held by a data receiving apparatus capable of converting from CDR (Common Data Representation) data to structure data;
A data transmission device comprising: a communication unit that transmits the difference data generated by the difference data generation unit to the data reception device. The data receiving device is:
Holds one structure data,
The difference data generation unit
The data transmission device according to claim 1, wherein difference data for the one structure data held by the data reception device is generated as CDR data. The data receiving device is:
Holds multiple structure data,
The difference data generation unit
The data transmission apparatus according to claim 1, wherein difference data for any one of the plurality of structure data held by the data reception apparatus is generated as CDR data. The difference data generation unit
The data transmission device according to claim 3, wherein the difference data for the structure data having the smallest data size of the difference data is generated as CDR data from the plurality of structure data held by the data reception device. The difference data generation unit
The data transmission apparatus according to claim 1, wherein difference data for notifying an update position and an update value in structure data held by the data reception apparatus is generated as CDR data. The difference data generation unit
The data transmission device according to claim 1, wherein difference data for notifying an update position and an update value in structure data held by the data reception device and an operation value is generated as CDR data. A data receiving device for holding structure data,
A communication unit that receives differential data for the structure data, which is CDR (Common Data Representation) data;
A data receiving apparatus comprising: a data updating unit that updates the structure data using the difference data received by the communication unit. The data receiving device is:
Holds one structure data,
The communication unit is
Receiving difference data for the one structure data;
The data update unit
The data receiving device according to claim 7, wherein the one structure data is updated using the difference data received by the communication unit. The data receiving device is:
Holds multiple structure data,
The communication unit is
Receiving difference data for any one of the plurality of structure data;
The data update unit
The data receiving apparatus according to claim 7, wherein the target structure data is updated using the difference data received by the communication unit. The communication unit is
Receiving difference data for notifying an update position and an update value in the structure data;
The data update unit
The data receiving apparatus according to claim 7, wherein the structure data is updated using an update position and an update value notified by the difference data received by the communication unit. The communication unit is
Receiving difference data for notifying an operation position and an operation value for obtaining an update position and an update value in the structure data,
The data update unit
The data receiving apparatus according to claim 7, wherein the structure data is updated using an update position, a calculation method, and an operation value notified by the difference data received by the communication unit. A data transmission device, which is a computer,
A differential data generation step of generating, as CDR data, differential data for structure data held by a data receiving device capable of conversion from CDR (Common Data Representation) data to structure data;
A data transmission method comprising: a transmission step of transmitting the difference data generated by the difference data generation step to the data receiving device. A data receiving device, which is a computer and holds structure data,
A receiving step of receiving differential data for the structure data, which is CDR (Common Data Representation) data;
A data receiving method comprising: a data updating step of updating the structure data using the difference data received in the receiving step. To a data transmission device that is a computer,
A differential data generation step of generating, as CDR data, differential data for structure data held by a data receiving device capable of conversion from CDR (Common Data Representation) data to structure data;
A data transmission program comprising: a transmission step of transmitting the difference data generated by the difference data generation step to the data receiving device. In a data receiving device that is a computer that holds structure data,
A receiving step of receiving differential data for the structure data, which is CDR (Common Data Representation) data;
A data receiving program comprising: a data updating step for updating the structure data using the difference data received in the receiving step.

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