JP2002232512A - Response mode variable data distribution method and its execution device, and its processing program and recording medium - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a technology for realizing data distribution optimum to a system configuration and service contents. SOLUTION: This invention provides a response mode variable data distribution method where a response mode is made variable in the case of conducting a setup request of connection and data transmission from a transmitter side computer to a receiver side computer, includes a step where the transmitter side computer informs the transmitter side computer about a different response mode depending on transmitted data as the response mode denoting a kind of a response to be replied by the receiver side computer, a step where the receiver side computer receives the response mode received from the transmitter side computer to decide the response mode of the receiver side computer, a step where the receiver side computer receives data from the transmitter side computer and applies response processing to the transmitter side computer on the basis of the decided response mode, and a step where the transmitter side computer conducts different re-transmission processing from each of data in response to the received response mode when the transmitter side computer retransmits the data to the receiver side computer.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a variable response mode data distribution system for performing data distribution by changing the response mode of a receiving computer, and more particularly to file data such as text files, image files, video files, audio files, and program files. Mode in which data is transmitted from a transmitting computer to one or more receiving computers, and the response mode is changed for each receiving computer or for each receiving computer in the same distribution according to reliability, performance, communication cost, etc. The present invention relates to a technology effective when applied to a distribution system.

[0002]

2. Description of the Related Art Conventionally, a transmission computer makes a connection establishment request and data distribution to N (N: an integer of 1 or more) destination computers, and the reception computer responds to the connection establishment request and confirms delivery to the received data. In the data distribution system that makes a response, the response mode of the receiving computer is fixed to one of the following: a positive response or a negative response, a positive response only, a negative response only, or no response. Was decided.

FIG. 16 is a diagram showing an example of a data reception response in the conventional multicast distribution. (A) is an example of a system that replies either an affirmative response or a negative response. In this example, the transmitting computer 1 multicasts data to the receiving computers 1, 2,. Negative acknowledgment indicating data reception failure is returned from reception computer 2, and acknowledgment indicating data reception success is returned from other reception computers.

[0004] (b) is an example of a system in which only an acknowledgment is returned. In this example, the transmitting computer 1 multicasts data to the receiving computers 1, 2, ..., m to receive data. An acknowledgment is returned from the receiving computer except the failed receiving computer 2, and nothing is returned from the receiving computer 2.
The transmitting computer 1 detects that the receiving computer 2 has failed in reception by not receiving an acknowledgment.

[0005] (c) is an example of a system in which only a negative response is returned. In this example, the transmitting computer 1 multicasts data to the receiving computers 1, 2, ..., m to receive data. A negative response is returned from the failed receiving computer 2, and nothing is returned from the receiving computer that has successfully received the data. The transmitting computer 1 detects that the receiving computers other than the receiving computer 2 have succeeded in receiving by not receiving a negative response.

FIG. 1D shows an example of a system that does not make a response. In this example, the transmitting computer 1 multicasts data to the receiving computers 1, 2,..., M, and the receiving computer 1 No response is made regardless of reception success / failure. The transmission computer 1 increases the data arrival probability by transmitting data a plurality of times.

[0007] As in this example, in the conventional system, the response mode is fixedly defined in the system.
In one delivery, all the receiving computers take the same response mode.

[0008]

As described above, in the conventional method in which the response mode is fixedly determined by the system, when the reliability, performance, communication cost, and the like required for each data to be distributed are different. In this case, it is difficult to optimize reliability, performance, communication cost, and the like because one of the response modes must be used in a fixed manner. In addition, it is possible to switch the response mode by preparing a plurality of distribution systems and switching them by an upper-level mechanism. In this case, the amount of computer resources is increased by preparing the plurality of systems, and the performance is improved by the switching. There were problems such as a decrease.

Further, if it is desired to change the response mode for each receiving computer due to a difference in service contract form, etc., the same data must be distributed for each response mode.

[0010] When data is distributed in a single distribution to a plurality of receiving computers in which the response mode is changed for each receiving computer, the same data can be transmitted without requiring a response and retransmission-based transmission requiring some response. There has been no method to mix transmissions that are continuously transmitted (continuously transmitted) multiple times.

[0011] An object of the present invention is to solve the above-mentioned problems and to switch the response mode according to the required conditions such as required reliability, performance and communication cost, so that the optimum data according to the system configuration and service contents can be obtained. An object of the present invention is to provide a technology capable of realizing distribution.

[0012]

SUMMARY OF THE INVENTION The present invention relates to a response mode variable data distribution system for changing a response mode when a connection establishment request or data transmission is performed from a transmitting computer to a receiving computer. The transmission computer notifies the receiving computer of a response mode indicating the type of response to be replied, and changes the content of the response processing of the receiving computer.

In the present invention, the transmission computer is provided with a response mode notifying means for notifying the reception computer of the response mode specified by the user or the upper AP before the reception computer starts responding, and the response mode notified by the transmission computer is provided. Response mode reception determining means for determining the own response mode,
And a response means for changing the response mode based on the response mode.

Further, when a response mode requiring a response and a response mode performing continuous transmission without a response are mixed in the transmission computer, the response is based on the response result of the reception computer operating in the response mode requiring the response. The first continuous transmission mixed transmission means for transmitting the remaining data after giving priority to the transmission of retransmission data, or the first destination address for the first data transmission and data retransmission, and There is provided a second continuous transmission mixed transmission means for distinguishing and transmitting data from the second destination address for the second and subsequent data transmission.

According to the above configuration, the transmitting computer notifies the receiving computer of the response mode specified by the user or the higher-level AP before starting the response of the receiving computer using the response mode notifying means. The response mode is determined by using the mode reception determination means to determine its own response mode, and a response based on the response mode is performed when actually responding.

Further, when a response mode that requires a response and a response mode that does not require a response for continuous transmission are mixed, the continuous transmission mixed transmission means is used to transmit the second and subsequent consecutively transmitted data. Prior to transmission, retransmission data is transmitted, or the first data transmission or data retransmission and the second and subsequent consecutive transmissions are transmitted using different destination addresses.

As described above, according to the present invention, the response mode can be changed for each data distribution or when there are multiple response triggers, and for each response, the response mode can be changed for each receiving computer even in the same data distribution. Can be changed, and even when data retransmission and continuous transmission are mixed, efficient distribution can be achieved, so that optimal operation of the system according to required reliability, performance, and communication cost can be performed.

As described above, according to the response mode variable data distribution system of the present invention, the response mode indicating the type of response to be answered by the receiving computer is notified from the transmitting computer to the receiving computer, and the content of the response processing of the receiving computer Therefore, by switching the response mode according to the required conditions such as the required reliability, performance, and communication cost, it is possible to realize optimal data distribution according to the system configuration and service contents. .

[0019]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A description will now be given of a response mode variable data distribution system according to an embodiment for performing data distribution by changing response processing contents of a receiving computer according to a response mode notified from a transmitting computer to a receiving computer.

FIG. 1 is a diagram showing an outline of a response mode variable data distribution system according to this embodiment. As shown in FIG.
The transmitting computer 1 and the receiving computers 1, 2,..., M are IP (Interne
t Protocol) Connected to a network that can use multicast, and after transmitting mode is notified from transmitting computer 1 to each receiving computer, data transmitted from transmitting computer 1 is broadcast to all receiving computers simultaneously. It has become.

FIG. 2 is a diagram showing a schematic configuration of the response mode variable data distribution system of the present embodiment. As shown in FIG. 2, the transmission computer according to the present embodiment comprises a response mode notifying unit 20.
1, a transmission unit 202, and a transmission unit 203 when continuous transmission is mixed.

The response mode notifying means 201 notifies each receiving computer of a different response mode as a response mode indicating the type of response to be answered by the receiving computer depending on the importance of data and the contents of the service received by the receiving computer. It is a processing unit.

The transmitting unit 202 is a processing unit that transmits data to the receiving computer and, when retransmitting data from the transmitting computer to the receiving computer, performs a different retransmission process for each data according to the notified response mode. is there. When the response mode requiring a response and the response mode performing continuous transmission without a response are mixed, the retransmission of data is performed more than the second and subsequent data transmissions in the continuous transmission. This is a processing unit that performs processing for prioritizing and performs data transmission for the second and subsequent consecutive transmissions using a destination address different from that for data retransmission.

The transmitting computer is connected to the response mode notifying means 201,
A program for functioning as the transmission unit 202 and the continuous transmission unit 203 is recorded on a recording medium such as a CD-ROM, stored on a magnetic disk or the like, and then loaded into a memory and executed. The recording medium for recording the program may be a recording medium other than the CD-ROM. In addition, the program may be installed in the information processing apparatus from the recording medium and used, or the recording medium may be accessed through a network to use the program.

The receiving computer is a response mode reception determining means 2
11 and a response unit 212.

The response mode reception determining means 211 is a processing unit that receives the response mode notified from the transmitting computer and determines the response mode of the receiving computer. Response means 212
Is a processing unit that receives data from the transmitting computer and performs response processing based on the determined response mode.

The receiving computer is connected to the response mode reception determining means 21.
1 and a program for functioning as the response unit 212 are recorded on a recording medium such as a CD-ROM, stored on a magnetic disk or the like, and then loaded into a memory and executed. The recording medium for recording the program is C
A recording medium other than the D-ROM may be used. In addition, the program may be installed in the information processing apparatus from the recording medium and used, or the recording medium may be accessed through a network to use the program.

A description will now be given of processing for performing data distribution and response in accordance with the importance of distribution data in the response mode variable data distribution system of the present embodiment.

FIG. 3 is a diagram showing an example of switching response modes according to the importance of distribution data according to the present embodiment. Here, an example in which the response mode is switched according to the importance of the data to be distributed will be introduced. In the following examples (a) to (c), only a response (data response) requiring data delivery confirmation is handled as a response type, a response mode requiring either a positive / negative response, a negative response. A response mode that requires only a response and a response mode that does not require a response will be described.

(A) Since the first data is very important data, it is assumed that the user has requested a response mode requiring either a positive or negative response. The transmitting computer notifies the receiving computer of a response mode for requesting either an affirmative / negative response in accordance with data distribution. The receiving computer that has received the response mode recognizes that the response mode is a mode for responding to either an affirmative / negative response, and if data reception fails as in the receiving computer 2, sends a negative response to other When data reception is successful as in the receiving computer, an acknowledgment is made. The transmitting computer receives the positive / negative acknowledgment from all the receiving computers, and retransmits data to the receiving computer that has made the negative acknowledgment.

(B) Subsequently, the second data does not require as much reliability as the first data, but it is not necessary to retransmit to the receiving computer that failed in data reception while suppressing the communication cost. It is assumed that the user has requested a response mode requiring only a response. The transmitting computer notifies the receiving computer of the response mode in which only the negative response is requested in accordance with the data distribution. The receiving computer that has received the response mode recognizes that the response mode is a mode in which only a negative response is made, and makes a negative response only when data reception fails as in the receiving computer 2. The transmitting computer retransmits data to the receiving computer that has made a negative response during a certain period of time.

(C) Next, since the third data does not require reliability and the communication cost is to be kept to a minimum, it is assumed that the user has requested a response mode that does not require a response. . The transmitting computer notifies the receiving computer that the response mode is the response unnecessary mode in accordance with the data distribution. The receiving computer that has received the response mode recognizes that the mode is the response unnecessary mode, and does not make a response regardless of the success / failure of the reception.

FIG. 4 is a flowchart showing a data distribution processing procedure according to the importance of distribution data according to the present embodiment. As shown in FIG. 4, the response mode notifying means 2 of the transmitting computer
01 notifies the receiving computer of a response mode indicating the type of response to be answered by the receiving computer, and the transmitting unit 202 receives the response from the receiving computer after transmitting the data and corresponds to the notified response mode. Resend the data.

In step 401, the response mode notifying means 201 of the transmission computer reads response mode information indicating the importance of the data to be distributed and the contents of the response mode from the magnetic disk device of the transmission computer, refers to the response mode information, and intends to distribute. The response mode of the data is read from the response mode information.

FIG. 5 is a diagram showing an example of response mode information indicating the importance of data distributed according to the present embodiment and the contents of the response mode. The response mode information in FIG. 5 stores the contents of the response mode corresponding to the importance of the data to be distributed.

In step 402, whether the read response mode is transmitted unicast individually to the receiving computers,
Alternatively, a list of the correspondence between the receiving computer and the response mode is multicast to notify each receiving computer in the response mode.

At step 403, the transmitting means 2 of the transmitting computer
02 transmits data to each receiving computer, and performs retransmission processing corresponding to the notified response mode in the following steps.

In step 411, the contents of the response mode corresponding to the transmitted data are checked, and if the response mode is a response mode requiring either a positive / negative response, the flow proceeds to step 412.

In step 412, the contents of the response received from the transmitting computer are checked. If a negative response has been received, the process proceeds to step 413. In step 413, data is retransmitted to the receiving computer that transmitted the negative response. I do.

In step 421, the contents of the response mode corresponding to the transmitted data are checked. If the response mode is a response mode requesting only an acknowledgment, the process proceeds to step 422.

At step 422, it is checked whether an acknowledgment has been received from the transmitting computer. If no acknowledgment has been received, the process proceeds to step 423. Step 42
In step 3, it is checked whether a predetermined time has elapsed without receiving an acknowledgment from the transmission computer. If the predetermined time has elapsed, the process proceeds to step 424. In step 424, the acknowledgment is not transmitted. Retransmit data to the receiving computer.

In step 431, the contents of the response mode corresponding to the transmitted data are checked. If the response mode is a response mode requesting only a negative response, the flow proceeds to step 432.

In step 432, it is checked whether a negative response has been received from the transmitting computer. If a negative response has been received, the process proceeds to step 433, and step 433 is performed.
Then, data is retransmitted to the receiving computer that has transmitted the negative response.

FIG. 6 is a flowchart showing a processing procedure of a response process according to the importance of distribution data according to the present embodiment. As shown in FIG. 6, the response mode reception determining means 211 of the receiving computer receives the response mode notified from the transmitting computer and performs a process of determining its own response mode. The response unit 212 performs a response process of the receiving computer based on the determined response mode.

In step 601, the response mode reception determining means 211 of the receiving computer checks whether or not the receiving computer has received a response mode notification indicating the type of response to be answered from the transmitting computer. If so, the process proceeds to step 602. In step 602, the content of the received response mode is checked to determine its own response mode, and the content of the response mode of the data received thereafter is notified to the response means 212. In step 603, the receiving computer receives the data transmitted from the transmitting computer,
In the following steps, a response process corresponding to the notified response mode is performed.

In step 611, the response means 212 checks the contents of the response mode notified from the response mode reception determination means 211, and if the response mode is a response mode requiring either a positive / negative response, Step 61
Proceed to 2.

In step 612, the result of data reception from the transmitting computer is checked. If data reception is successful, the flow proceeds to step 613. If data reception has failed, the flow proceeds to step 614. In step 613,
An acknowledgment is transmitted to the transmitting computer that transmitted the data, and in step 614, a negative acknowledgment is transmitted to the transmitting computer that transmitted the data.

In step 621, the contents of the response mode notified from the response mode reception determining means 211 are checked. If the response mode is a response mode requesting only an acknowledgment, the process proceeds to step 622.

In step 622, the result of the data reception from the transmitting computer is checked. If the data has been successfully received, the process proceeds to step 623. In step 623, an acknowledgment is sent to the transmitting computer that transmitted the data. Send.

In step 631, the contents of the response mode notified from the response mode reception determining means 211 are examined. If the response mode is a response mode requesting only a negative response, the flow proceeds to step 632.

In step 632, the result of data reception from the transmission computer is checked. If data reception has failed, the flow advances to step 633. In step 633, a negative response is sent to the transmission computer that transmitted the data. Send.

The data distribution using the response mode required for each receiving computer in the response mode variable data distribution system of the present embodiment will be described below.

FIG. 7 is a diagram showing an example of data distribution in which different response modes are mixed according to the service conditions of the present embodiment. Here, as an example of using the response mode requested for each receiving computer in one data distribution, an example in which the response mode is changed according to the fee paid by the receiving user will be introduced.

Since the receiving computers 1 and 2 have contracted for a high-reliability service, they request a response mode for performing either an affirmative or negative response, and the receiving computers 3 and 4 contract for a medium-reliability service. Therefore, it is assumed that the request is made in the response mode in which only a negative response is made, and that the receiving computer 5 requests the response mode in which no response is required because the service contract is a service contract that does not guarantee the reliability.

The transmitting computer, in accordance with the data distribution,
For the receiving computers 1 and 2, the response mode requires either a positive / negative response. For the receiving computers 3 and 4, the response mode requires only a negative response. The computer 5 is notified that the mode is the response unnecessary mode. As the notifying means, it is possible to perform unicasting for each receiving computer individually, or to multicast a list of the correspondence between the receiving computer and the response mode.

The receiving computer extracts its own response mode from the notified contents. In this example, the receiving computers 1, 2
Is a mode in which either a positive or negative response is made, the receiving computers 3 and 4 recognize a mode in which only a negative response is responded, and the receiving computer 5 recognizes a mode in which no response is required.

The receiving computers 1 and 2 are in a mode requiring either a positive / negative response. The receiving computer 1 transmits an acknowledgment because the data has been successfully received, and the receiving computer 2 fails to receive the data. Therefore, a negative response is sent.

The receiving computers 3 and 4 are in a mode requiring only a negative response. The receiving computer 3 does not respond since the data reception is successful, and the receiving computer 4 does not respond because the data reception failed. Is going.

Further, the receiving computer 5 does not respond even though the data reception has failed since no response is required.

When a negative response is returned from the receiving computers 1 and 2 and the receiving computers 3 and 4, the transmitting computer retransmits the data. However, regarding the receiving computers 3 and 4, if the negative acknowledgment is lost, the data is not retransmitted. Also,
It does not wait for a response to the receiving computer 5 and does not perform retransmission even if a negative response is returned.

FIG. 8 is a flowchart showing a data distribution processing procedure according to the importance of distribution data according to the present embodiment. As shown in FIG. 8, the response mode notifying means 2 of the transmitting computer
01 indicates a different response mode for each receiving computer as a response mode indicating the type of response to be received by each receiving computer, and the transmitting means 202 receives a response from the receiving computer after transmitting data, and The data corresponding to the notified response mode is retransmitted.

In step 801, the response mode notifying means 201 of the transmitting computer reads response mode information indicating the contents of the service contracted by each receiving computer and the response mode from the magnetic disk device of the transmitting computer and refers to the response mode information. The response mode of the computer is read from the response mode information.

FIG. 9 is a diagram showing an example of the response mode information indicating the contents of the service and the response mode in each receiving computer of the present embodiment. The response mode information of FIG. 9 stores the content of the response mode corresponding to the service content of each receiving computer.

In step 802, whether the read response mode is transmitted by unicast individually to the receiving computer,
Alternatively, a list of the correspondence between the receiving computer and the response mode is multicast to notify each receiving computer in the response mode.

In step 803, the transmitting means 2 of the transmitting computer
02 transmits data to each receiving computer, and performs retransmission processing corresponding to the notified response mode in the following steps.

In step 804, the response mode information is read from the magnetic disk device of the transmitting computer and is referred to, and the contents of the response mode of each receiving computer are read.

In step 811, the contents of the read response mode are checked, and if the response mode is a response mode requiring either a positive / negative response, the flow proceeds to step 812.

In step 812, the contents of the response received from the transmitting computer are checked. If a negative response has been received, the process proceeds to step 813. In step 813, data is retransmitted to the receiving computer that transmitted the negative response. I do.

In step 821, the contents of the read response mode are checked. If the response mode is a response mode requesting only an acknowledgment, the process proceeds to step 822.

At step 822, it is checked whether an acknowledgment has been received from the transmitting computer. If no acknowledgment has been received, the process proceeds to step 823. Step 82
In step 3, it is checked whether a predetermined time has elapsed without receiving an acknowledgment from the transmission computer. If the predetermined time has elapsed, the process proceeds to step 824. In step 824, the acknowledgment is not transmitted. Retransmit data to the receiving computer.

In step 831, the contents of the read response mode are checked. If the response mode is a response mode requesting only a negative response, the flow advances to step 832.

At step 832, it is checked whether or not a negative response has been received from the transmitting computer. If a negative response has been received, the process proceeds to step 833, where step 833 is performed.
Then, data is retransmitted to the receiving computer that has transmitted the negative response.

In step 805, it is determined whether or not processing of all records in the response mode information has been completed.
If there is a record that has not been processed yet, the process returns to step 804.

In the following, a description will be given of data distribution in which the response mode required for each receiving computer is used in the response mode variable data distribution system of the present embodiment and retransmission data is prioritized when continuous transmission is mixed.

FIG. 10 is a diagram showing an example of data distribution in which retransmission data is prioritized when continuous transmission is mixed according to the present embodiment. Here, as an example of using the response mode requested for each receiving computer in one data distribution, an example in which the response mode is changed according to the fee paid by the receiving user will be introduced.

Since the receiving computers 1, 2, and 3 have contracted for a high-reliability service, the receiving computers 4, 5 request a response mode for performing either an affirmative / negative response. Since the contract has been made, it is assumed that a response mode requiring no response is requested. However, a service without reliability guarantee does not require a response, but it is assumed that data is continuously transmitted twice.

[0092] The transmitting computer, in accordance with the data distribution,
For the receiving computers 1, 2, and 3, it is a response mode that requires either an affirmative or negative response. For the receiving computers 4, 5, it is a no-response mode and the number of consecutive transmissions is two. Notify that there is. As the notifying means, it is possible to perform unicasting for each receiving computer individually, or to multicast a list of the correspondence between the receiving computer and the response mode.

The receiving computer extracts its own response mode from the notified contents. In this example, the receiving computers 1,2,
3 is a mode for responding to either affirmative / negative, and the receiving computers 4 and 5 recognize that the continuous transmission is twice in the response unnecessary mode.

The receiving computers 1, 2, and 3 are modes that require either an affirmative / negative response. The receiving computers 1, 3 transmit an acknowledgment because the data has been successfully received.
2 transmits a negative acknowledgment because data reception has failed. Also, since the receiving computers 4 and 5 do not need a response,
Does not respond even if data reception failed.

Since the transmitting computer has returned a negative response from the receiving computer 2, the transmitting computer preferentially retransmits the lost 15th packet. If the retransmission packet arrives correctly at the receiving computer 2, the remaining data, 0 to 14 and 16 to 100
The data up to the number is continuously transmitted to the receiving computers 4 and 5.

Thus, the first data transmission of the low-reliability service can be shared with the data transmission of the high-reliability service, so that efficient distribution can be performed. Furthermore, since retransmission to a highly reliable service contractor is performed with priority, service quality is not degraded, and continuous transmission to a service contractor without reliability guarantee is performed only in a different packet arrival order. Does not decrease, so that the quality does not deteriorate.

FIG. 11 is a flowchart showing a data distribution processing procedure according to the present embodiment in which retransmission data is prioritized when continuous transmission is mixed. As shown in FIG. 11, the response mode notifying means 201 of the transmitting computer notifies each receiving computer of a response mode that requires a response and a response mode of performing continuous transmission without requiring a response. Then, after giving priority to the transmission of retransmission data based on the response result of the receiving computer operating in the response mode requiring a response, a process of transmitting the remaining continuous transmission data is performed.

In step 1101, the response mode notifying means 201 of the transmitting computer reads response mode information indicating the contents of the service contracted by each receiving computer and the response mode from the magnetic disk device of the transmitting computer and refers to the response mode information. The response mode of the computer is read from the response mode information.

FIG. 12 is a diagram showing an example of the response mode information when the continuous transmission is mixed according to the present embodiment. The response mode information of FIG. 12 stores the contents of the response mode of each receiving computer when continuous transmission is mixed.

In step 1102, the read response mode is transmitted unicast individually to each receiving computer, or a list of the correspondence between the receiving computer and the response mode is multicast to notify each receiving computer of the response mode. .

In step 1103, the transmitting means 203 of the transmitting computer at the time of continuous transmission mixed transmits data to each receiving computer,
In the following steps, retransmission processing corresponding to the notified response mode is performed.

In step 1104, the response mode information is read from the magnetic disk device of the transmitting computer and is referred to, and the contents of the response mode of each receiving computer are read.

At step 1111, the contents of the read response mode are checked, and if the response mode is a response mode requiring either a positive / negative response, the process proceeds to step 1112.

In step 1112, the contents of the response received from the transmitting computer are checked. If a negative response has been received, the process proceeds to step 1113. In step 1113, the data is retransmitted to the receiving computer that transmitted the negative response. I do.

In step 1121, the contents of the read response mode are checked. If the response mode is a response mode requiring only an acknowledgment, step 1122 is executed.
Proceed to.

At step 1122, it is checked whether or not an acknowledgment has been received from the transmitting computer. If no acknowledgment has been received, the process proceeds to step 1123. In step 1123, it is checked whether a predetermined time has elapsed without receiving an acknowledgment from the transmitting computer. If the predetermined time has elapsed, the process proceeds to step 1124. In step 1124, the acknowledgment is transmitted. Retransmit data to the receiving computer.

In step 1131, the contents of the read response mode are checked. If the response mode is a response mode requesting only a negative response, step 1132 is executed.
Proceed to.

At step 1132, it is checked whether or not a negative response has been received from the transmitting computer. If a negative response has been received, the process proceeds to step 1133, at which step 1133 is executed.
At 133, data is retransmitted to the receiving computer that has transmitted the negative response.

In step 1105, it is checked whether or not all the records in the response mode information have been processed. If there is a record that has not been processed, the process returns to step 1104.

At step 1106, the transmission means 2 when continuous transmission is mixed
03 refers to the response mode information again, reads the contents of the response mode of each receiving computer, examines the contents of the response mode, and if the response mode is a response mode in which continuous transmission is not required without response, The second and subsequent data transmissions are performed to the receiving computer that performs continuous transmission.

In the response mode variable data distribution system according to the present embodiment, the response mode required for each receiving computer is used, and the first data transmission, the data retransmission, and the second and subsequent data transmission are performed when continuous transmission is mixed. The data distribution using different destination addresses will be described.

FIG. 13 is a diagram showing an example of data distribution using different destination addresses for the first data transmission and the retransmission of the data and the second and subsequent data transmission when the continuous transmission is mixed in this embodiment. Here, as an example of using the response mode requested for each receiving computer in one data distribution, an example in which the response mode is changed according to the fee paid by the receiving user will be introduced.

Since the receiving computers 1, 2, and 3 have contracted for a high-reliability service, they request a response mode for performing either an affirmative / negative response, and the receiving computers 4, 5 request a service contract that does not guarantee reliability. Therefore, it is assumed that a response mode requiring no response is requested. However, in a service without reliability guarantee, no response is required, but data is continuously transmitted twice.

[0099] The transmitting computer, in accordance with the data distribution,
For the receiving computers 1, 2, and 3, it is a response mode that requires either an affirmative or negative response. For the receiving computers 4, 5, it is a no-response mode and the number of consecutive transmissions is two. Is notified that the destination multicast address for the second continuous transmission is 226.1.1.5. As the notification means, the receiving computer is individually performed by unicast, or
It is also possible to multicast a list of the correspondence between the receiving computer and the response mode.

The receiving computer extracts its own response mode from the notified contents. In this example, the receiving computers 1,2,
3 is a mode for responding to either affirmative / negative, and the receiving computers 4 and 5 recognize that the continuous transmission is twice in the response unnecessary mode. At this time, the receiving computers 4 and 5 make a JOIN to the destination address of the second consecutively transmitted data 2261.1.5 and prepare to receive the consecutively transmitted data.

The receiving computers 1, 2, and 3 are modes that require either a positive or negative response. The receiving computers 1, 3 transmit an acknowledgment because the data has been successfully received.
2 transmits a negative acknowledgment because data reception has failed. Also, since the receiving computers 4 and 5 do not need a response,
Does not respond even if data reception failed.

The transmitting computer retransmits the lost 15th packet because a negative response has been returned from the receiving computer 2. Thereafter or in parallel with this, the same data (all packets) is continuously transmitted to the destination address for the second consecutive transmission.

Thus, since the first data transmission of the low-reliability service can be shared with the data transmission of the high-reliability service, efficient distribution can be performed. Since it is sent to the destination, unnecessary traffic to the receiving computer of the highly reliable service does not occur, and the transmission of the next data can be started without waiting for the completion of the continuous transmission.

FIG. 14 is a flow chart showing the processing procedure of data transmission using different destination addresses for the first data transmission and retransmission of the data and the second and subsequent data transmissions when continuous transmission is mixed according to the present embodiment. As shown in FIG. 14, the response mode notifying means 201 of the transmitting computer notifies each receiving computer of a response mode that requires a response and a response mode of performing continuous transmission without requiring a response. ,
A process is performed in which the first destination address for the first data transmission and the data retransmission is distinguished from the second destination address for the second and subsequent data transmissions during the continuous transmission.

In step 1401, the response mode notifying means 201 of the transmission computer reads response mode information indicating the contents of the service contracted by each reception computer and the response mode from the magnetic disk device of the transmission computer and refers to the response mode information. The response mode of the computer is read from the response mode information.

At step 1402, the read response mode is transmitted unicast individually to the receiving computers, or a list of the correspondence between the receiving computer and the response mode is multicast to notify each receiving computer of the response mode. . Here, if the response mode of the receiving computer is a response mode in which continuous transmission is performed without response, the number of continuous transmissions and a destination multicast address for the second and subsequent consecutive transmissions are also notified.

At step 1403, the transmitting means 203 of the transmitting computer at the time of continuous transmission mixed transmits data to each receiving computer,
In the following steps, retransmission processing corresponding to the notified response mode is performed.

At step 1404, the transmission means 2 when continuous transmission is mixed
In step 03, the response mode information is read from the magnetic disk device of the transmitting computer and referred to, and the contents of the response mode of each receiving computer are read.

At step 1411, the contents of the read response mode are checked, and if the response mode is a response mode that requires either a positive / negative response, the process proceeds to step 1412.

In step 1412, the contents of the response received from the transmitting computer are examined. If a negative response has been received, the process proceeds to step 1413. In step 1413, data is retransmitted to the receiving computer that transmitted the negative response. I do.

In step 1421, the contents of the read response mode are checked. If the response mode is a response mode requiring only an acknowledgment, step 1422 is executed.
Proceed to.

In step 1422, it is checked whether an acknowledgment has been received from the transmitting computer. If no acknowledgment has been received, the flow advances to step 1423. In step 1423, it is checked whether a predetermined time has elapsed without receiving an acknowledgment from the transmission computer. If the predetermined time has elapsed, the process proceeds to step 1424. In step 1424, the acknowledgment is transmitted. Retransmit data to the receiving computer.

In step 1431, the contents of the read response mode are checked. If the response mode is a response mode requesting only a negative response, step 1432 is executed.
Proceed to.

In step 1432, it is checked whether or not a negative response has been received from the transmitting computer. If a negative response has been received, the process proceeds to step 1433, and step 1433 is performed.
At 433, data is retransmitted to the receiving computer that transmitted the negative response.

In step 1441, the contents of the read response mode are checked. If the response mode is a response mode in which continuous transmission is performed without response, the process proceeds to step 1442. In step 1442, the second and subsequent data transmissions are performed to the receiving computer that performs the serial transmission using the destination multicast address for the second and subsequent consecutive transmissions.

In step 1405, it is determined whether or not processing of all records in the response mode information has been completed. If there is a record that has not been processed, the process returns to step 1404.

In the following, in the response mode variable data distribution system according to the present embodiment, data distribution in a form other than the above-described one will be described.

FIG. 15 is a diagram showing an example of data distribution according to the contract form of the communication line of the present embodiment. This system uses a satellite line for data distribution and an I
An SDN (Integrated Services Digital Network) line is used, and the following two cases will be described depending on the contract type of the ISDN line.

Case (a) The billing contract for the ISDN line is
In the case of a day-time billing system and a flat-rate contract in the nighttime, the response mode is changed according to the data distribution time zone, and in the daytime, a negative response is made to reduce the communication cost of response. It is also possible to distribute in a response mode of only a response mode and to switch to a response mode that requires either a positive or negative response at night.

Case (b) A case where a receiving computer belonging to a major city or the like has an all-day fixed-rate ISDN line contract and a receiving computer belonging to a local city has a time-charging contract, and the response mode is changed for each receiving computer. By doing
A response mode that requires either a positive or negative response for the receiving computer in the major city. To reduce the communication cost by suppressing the response of the receiving computer in the local city, only the positive response is used for the receiving computer in the local city. It is also possible to distribute in the response mode of.

An example in which the response mode is switched according to the number of destinations will be described. When the number of destinations of data to be distributed is very large, such as on the order of tens of thousands, performance degradation due to concentration of responses from them becomes remarkable. Therefore, performance degradation may be prevented by using only negative responses.

In this embodiment, when the number of destinations is small,
When a large number of orders in the tens of thousands are mixed, distribution is performed in a response mode that requires either a positive or negative response to a small number of destinations, and only a negative response is required only for a large number of destinations. It is also possible to switch to a response mode to perform distribution.

The examples given so far are all directed to a plurality of receiving computers, but can also be applied to a case where a single receiving computer is directed. Further, the present embodiment is not limited to the multicast means as the communication means, but is also applicable to a case where a unicast is used to sequentially distribute to a plurality of receiving computers.

As described above, according to this embodiment, the response mode can be dynamically and efficiently changed according to the required reliability, performance, communication cost, and the like. Further, even one transmission differs for each receiving computer. Since the response modes can be efficiently mixed, optimal data distribution according to the system configuration and service content can be realized.

As described above, according to the response mode variable data distribution system of the present embodiment, the response mode indicating the type of response to be answered by the receiving computer is notified from the transmitting computer to the receiving computer, and the response processing of the receiving computer is performed. By changing the response mode according to the required conditions such as required reliability, performance and communication cost, it is possible to realize optimal data distribution according to the system configuration and service contents It is.

[0126]

According to the present invention, the response mode indicating the type of response to be answered by the receiving computer is notified from the transmitting computer to the receiving computer, and the content of the response processing of the receiving computer is changed. By switching the response mode according to conditions such as performance, performance, and communication cost, it is possible to realize optimal data distribution according to the system configuration and service contents.

[Brief description of the drawings]

FIG. 1 is a diagram illustrating an outline of a response mode variable data distribution system according to an embodiment.

FIG. 2 is a diagram illustrating a schematic configuration of a response mode variable data distribution system according to the embodiment;

FIG. 3 is a diagram illustrating an example of switching response modes according to the importance of distribution data according to the embodiment;

FIG. 4 is a flowchart illustrating a data distribution processing procedure according to the importance of distribution data according to the embodiment;

FIG. 5 is a diagram illustrating an example of response mode information indicating the importance of data to be distributed and the contents of response modes according to the embodiment;

FIG. 6 is a flowchart illustrating a procedure of a response process according to the importance of distribution data according to the embodiment;

FIG. 7 is a diagram illustrating an example of data distribution in which different response modes are mixed according to service conditions according to the embodiment;

FIG. 8 is a flowchart illustrating a data distribution processing procedure according to the importance of distribution data according to the present embodiment.

FIG. 9 is a diagram illustrating an example of response mode information indicating the contents of a service content and a response mode in each receiving computer of the embodiment.

FIG. 10 is a diagram illustrating an example of data distribution in which retransmission data is prioritized when continuous transmission is mixed according to the embodiment;

FIG. 11 is a flowchart showing a data distribution processing procedure of giving priority to retransmission data when continuous transmission is mixed according to the embodiment;

FIG. 12 is a diagram illustrating an example of response mode information when continuous transmission is mixed according to the present embodiment.

FIG. 13 is a diagram illustrating an example of data distribution using different destination addresses for the first data transmission and retransmission of the data and the second and subsequent data transmission when continuous transmission is mixed in the embodiment.

FIG. 14 is a flowchart illustrating a processing procedure of data transmission using different destination addresses for the first data transmission and the retransmission of the data and the second and subsequent data transmission when continuous transmission is mixed according to the present embodiment.

FIG. 15 is a diagram illustrating an example of data distribution according to a contract type of a communication line according to the present embodiment.

FIG. 16 is a diagram showing an example of a data reception response in conventional multicast distribution.

[Description of Signs] 201: Response mode notification means, 202: Transmission means, 20
3. Transmission means when continuous transmission is mixed, 211 ... Response mode reception determination means, 212 ... Response means.

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Toshihiko Muranoshi 2-3-1 Otemachi, Chiyoda-ku, Tokyo Within Nippon Telegraph and Telephone Corporation (72) Inventor Teruji Joshita 2-3-3, Otemachi, Chiyoda-ku, Tokyo No. 1 Nippon Telegraph and Telephone Corporation F term (reference) 5K014 DA01 FA11 5K030 GA11 GA19 HA08 HB02 HC01 JL02 JL07 LD01 5K034 AA10 BB06 DD02 HH01 HH02 HH06

Claims (13)

[Claims] 1. A response mode variable data distribution method in which a response mode is variable when a connection establishment request or data transmission is performed from a transmission computer to a reception computer, wherein the type of response to be returned by the reception computer is determined. As a response mode to be indicated, a step of notifying the receiving computer of a different response mode according to data to be transmitted, a step of receiving the response mode notified from the transmitting computer and determining a response mode of the receiving computer, Receiving data and performing a response process to the transmitting computer based on the determined response mode; and, when retransmitting data from the transmitting computer to the receiving computer, performing data processing in accordance with the notified response mode. Performing a different retransmission process in the response mode variable data distribution method. 2. When notifying the response mode from a transmitting computer to a plurality of receiving computers, a different response mode is notified for each receiving computer in accordance with the service content of data transmission from the transmitting computer to each of the receiving computers. 2. The response mode variable data distribution method according to claim 1, wherein a plurality of response modes are mixed when data is transmitted from a computer to a plurality of receiving computers. 3. In a case where a response mode requiring a response and a response mode performing continuous transmission without a response are mixed, priority is given to retransmission of data over data transmission after the second consecutive transmission. 3. The method for distributing response mode variable data according to claim 2, wherein: 4. When a response mode that requires a response and a response mode that performs a continuous transmission without a response are mixed, the second and subsequent data of the continuous transmission using a destination address different from the data retransmission. The response mode variable data distribution method according to claim 2, wherein transmission is performed. 5. A response mode variable data distribution system in which a response mode is variable when a connection establishment request or data transmission is performed from a transmission computer to a reception computer, wherein the type of response to be returned by the reception computer is determined. Response mode notifying means for notifying the receiving computer of a different response mode according to the content of the data to be transmitted, and a response for receiving the response mode notified from the transmitting computer and determining the response mode of the receiving computer Mode reception determining means, receiving data from the transmitting computer, and responding means for performing a response process to the transmitting computer based on the determined response mode, when retransmitting data from the transmitting computer to the receiving computer, A transmission unit for performing a different retransmission process for each data according to the notified response mode. Data distribution system. 6. The response mode notifying means, when notifying the response mode from a transmission computer to a plurality of reception computers, different response modes for each reception computer in accordance with conditions for data transmission from the transmission computer to each of the reception computers. Notify mode,
6. The variable response mode data distribution system according to claim 5, wherein a plurality of response modes are mixed when data is transmitted from a transmission computer to a plurality of reception computers. 7. In a case where a response mode requiring a response and a response mode performing continuous transmission without a response are mixed, continuous transmission in which data retransmission is prioritized over data transmission in the second and subsequent consecutive transmissions. 7. The response mode variable data distribution system according to claim 6, further comprising a transmission unit when mixed. 8. In a case where a response mode requiring a response and a response mode performing continuous transmission without a response are mixed, the second and subsequent data in the continuous transmission using a destination address different from the data retransmission. 7. The response mode variable data distribution system according to claim 6, further comprising a transmission unit for performing continuous transmission when transmission is performed. 9. A program for causing a computer to function as a response mode variable data distribution system for changing a response mode when a connection establishment request or data transmission is performed from a transmission computer to a reception computer. Response mode notification means for notifying the receiving computer of a different response mode according to the content of data to be transmitted as a response mode indicating the type of response to be answered, and receiving and receiving the response mode notified by the transmission computer. Response mode reception determining means for determining a response mode of the computer; response means for receiving data from the transmission computer and performing response processing to the transmission computer based on the determined response mode; and When performing data retransmission, a transmission that performs different retransmission processing for each data according to the notified response mode is performed. Program for causing a computer to function as means. 10. The response mode notifying means, when notifying the response mode from a transmission computer to a plurality of reception computers, different response modes for each reception computer in accordance with conditions for data transmission from the transmission computer to each reception computer. Notify mode,
10. The program according to claim 9, wherein a plurality of response modes are mixed when transmitting data from a transmission computer to a plurality of reception computers. 11. In a case where a response mode that requires a response and a response mode that performs a continuous transmission without a response are mixed, a continuous transmission that prioritizes data retransmission over a second and subsequent data transmissions in the continuous transmission. The program according to claim 10, wherein the program causes a computer to function as a transmission unit when mixed. 12. When a response mode that requires a response and a response mode that performs a continuous transmission without a response are mixed, the second and subsequent data of the continuous transmission using a destination address different from the data retransmission. The program according to claim 10, wherein the program causes a computer to function as a continuous transmission mixed transmission unit that performs transmission. 13. A computer-readable recording medium on which the program according to claim 9 is recorded.