JP2002247132A - Data distribution management device, data distribution management system and data distribution management method using the device, and program to allow computer to execute the method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a data distribution management device that prevents a transmission reception buffer from being overflowed, eliminates congestion on a channel with a large delay, reduces time required for re-transmission and maintains the reliability and high-speed performance of communication. SOLUTION: Each of the data distribution management devices 10, 20 is provided with a reception buffer 7 that temporarily stores data sent from a terminal C1, a transmission buffer 6, a distribution management table 1 that stores a reception window size of a terminal C2, and an SG distribution management section 16 regulates a transfer speed of data temporarily stored in the reception buffer 7 and the transmission buffer 6 corresponding to the received window size as its control.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to a transmission line between a first terminal device and a second terminal device, wherein the transmission line connecting the second terminal device is connected to the first terminal device. Data distribution management having a transmission delay larger than a transmission delay of a transmission line connecting the device side, and performing transfer control of data transmitted and received between the first terminal device and the second terminal device. TECHNICAL FIELD The present invention relates to an apparatus, a communication system using the same, a data distribution management method, and a program for causing a computer to execute the method, and more particularly to data distribution management capable of improving speed performance degradation depending on reception timing of a delivery confirmation response during data distribution. The present invention relates to an apparatus, a communication system and a data distribution management method using the same, and a program for causing a computer to execute the method.

[0002]

2. Description of the Related Art Conventionally, in communication using TCP, a TCP on the transmitting side has a window size corresponding to a transmission buffer, and data is transmitted one after another by sliding a transmission window within this window size. I do. If a situation occurs in which the delivery acknowledgment is not accepted for some reason, the TCP determines that it is in a congestion state, reduces the window size, thereby lowering the throughput and trying to eliminate the congestion.

[0003] However, in a line having a large capacity such as a satellite line and a physically large transmission delay, TCP is used.
Is used, depending on the physical distance, it may take 0.5 seconds or more from the data transmission until the delivery confirmation response for the data is returned. This 0.5 second is a retransmission timeout time in general TCP, that is, a time until data transmission is determined to be failed and data retransmission is started, and TCP determines that a congestion state has occurred. Time. As a result, there arises a problem that the speed performance, that is, the throughput, cannot be exhibited corresponding to the original size of a large capacity line like a satellite line.

FIG. 13 is a block diagram showing the configuration of a data distribution management system using a conventional data distribution management device (see IPSJ Research Report 98-DPS-89-12). This data distribution management system solves the above-mentioned problems,
This is a system that can improve throughput. In FIG. 13, the data distribution management system includes:
The transmitting device C11, the receiving device C12, and the transmitting device C
11 and a transmission gateway 100 connected to the receiving device C12 via lines L11 and L12 for performing TCP communication. Line L12 is line L11
This is a line having a longer transmission delay than that of a line, for example, a satellite line.

[0005] In FIG. 13, a transmitting device C 11 includes a data packet output unit 111 for outputting a data packet,
A temporary arrival acknowledgment receiving unit 112 that receives the temporary arrival acknowledgment created by the transmission gateway 100. The transmission gateway 100 has a buffer 101 and a distribution management table 102, receives a data packet transmitted from the transmission device C11, stores the data packet in the buffer 101, and a buffer 101 via the line L12. An output unit 104 for outputting the data packet stored in the receiving device C12 to the receiving device C12;
Temporary delivery acknowledgment creating unit 105 that creates a temporary delivery acknowledgment for the data packet transmitted to receiving device C12
A temporary delivery confirmation response transmitting unit 106 for transmitting the created temporary delivery confirmation response to the transmitting device C11, and a receiving device C1
2 and a delivery information storage control unit that obtains communication information from the received SYN (connection request) packet and records it as delivery information in the delivery management table 102. 108 and a retransmission processing unit 109 for performing a retransmission process of the data packet. The receiving device C12 is connected to the transmitting gateway 100.
And a delivery acknowledgment output unit 122 that outputs a delivery acknowledgment to the transmission gateway 100.

When a data packet is transmitted from the transmitting device C11, the transmitting gateway 100 temporarily stores the received data packet in the buffer 101 and adds an entry of the data packet to the distribution management table 102. The transmission gateway 100 transmits the data packet received from the transmission device C11 to the line L12.
And a data packet of a provisional arrival acknowledgment for the data packet is created, and the provisional arrival acknowledgment is transmitted to the transmission device C11.

The receiving device C12 is connected to the transmitting gateway 10
When a data packet is received from 0, a delivery acknowledgment for the received data packet is created, and the delivery acknowledgment is transmitted to the transmission gateway 100. This delivery confirmation response includes data relating to the corresponding data packet and data relating to the state of arrival confirmation of the data packet. The transmission gateway 100 that has received the delivery confirmation response from the receiving device C12 clears the data packet held in the transmission gateway 100 and corresponding to the delivery confirmation response.

Here, in the process of transmitting a data packet from the transmitting gateway 100 to the receiving device C12, the transfer of the data packet fails and the receiving device C1
2 cannot receive this data packet, the transmission gateway 100 receives three identical delivery acknowledgments from the receiving device C12 side in succession, and performs retransmission processing of this data packet.

As described above, in the conventional data distribution management system, the transmission gateway 100 transmits a data packet from the transmission gateway 100 to the receiving device C12, and at the same time, transmits a temporary delivery acknowledgment (tmpACK) to the transmitting device C11. By returning, line L12
This has prevented the reduction of the TCP window size due to the transmission fee, and the degradation of the speed performance has been improved without the decrease in the throughput.

When receiving a data packet from transmitting device C11, transmitting gateway 100 creates a provisional delivery acknowledgment and sends a delivery acknowledgment (AC) from the receiving device.
K) until the data packet is received,
Three identical delivery acknowledgments (DuplicateAC
At the time point K) is received, the transmission of this data packet is determined to be unsuccessful, and the held data packet is retransmitted.

[0011]

However, in the conventional data distribution management system, the line L having a large transmission delay
Since the speed control in consideration of the delay of the window information due to the transmission delay via the transmission line 12 is not performed, the receiving device C12
There is a risk that the receiving buffer 123 overflows, and since data is always retransmitted via the line L12 with a large transmission delay when data is retransmitted, the data flow on the line L12 with a large delay increases and congestion occurs. However, there has been a problem that the reliability of the communication is reduced, and the time required for retransmission increases, thereby impeding the high-speed communication.

SUMMARY OF THE INVENTION The present invention has been made in view of the above, and it has been proposed to prevent overflow of a receiving buffer in a terminal device on the receiving side, to eliminate congestion on a line with a large delay, to shorten the time required for retransmission, and to reduce communication time. A data distribution management device capable of performing data distribution while maintaining reliability and high speed, a data distribution management system and a data distribution management method using the same, and a program for causing a computer to execute the method. .

[0013]

In order to achieve the above object, a data distribution management device according to the present invention is arranged on a transmission path between a first terminal device and a second terminal device,
The transmission line connecting the second terminal device side has a transmission delay smaller than the transmission delay of the transmission line connecting the first terminal device side, and is transmitted at least from the first terminal device. In a data distribution management device for transferring data to the second terminal device side, a reception buffer for temporarily storing data transmitted from the first terminal device, and a reception window size of the second terminal device, The receiving window size holding means for holding the data, and transfer control means for controlling a transfer rate of data temporarily stored in the receiving buffer in accordance with the receiving window size are provided.

According to the present invention, the data transmitted from the first terminal device is temporarily stored in the reception buffer, and the transfer control means stores the data in the second terminal held by the reception window size holding means. Control is performed to adjust the transfer rate of the data temporarily stored in the reception buffer according to the reception window size of the device.

[0015] A data distribution management device according to the next invention is arranged on a transmission path between a first terminal device and a second terminal device, and the transmission path connecting the second terminal device is connected to the second terminal device. The first terminal device has a transmission delay smaller than a transmission delay of a transmission line connecting the first terminal device side, and performs transfer control of data transmitted and received between the first terminal device and the second terminal device. In the data distribution management device, a reception buffer for temporarily storing data transmitted from the first terminal device; and a first buffer for each connection between the first terminal device and the second terminal device. Window size obtaining means for obtaining information on the window size of the terminal device and the second terminal device, and holding and managing the information on the window size for each connection obtained by the window size obtaining means. Management means, and transfer control means for controlling a transfer rate of data stored in the reception buffer for each connection corresponding to a window size managed by the management means. And

According to the present invention, the window size obtaining means is provided for every connection between the first terminal device and the second terminal device, and the window size of the first terminal device and the window of the second terminal device are provided. The size information is acquired, the management unit holds and manages the window size information for each connection, and the transfer control unit, for each connection corresponding to the window size managed by the management unit, Control is performed to adjust the transfer rate of data stored in the reception buffer.

A data distribution management device according to the next invention is arranged on a transmission line between a first terminal device and a second terminal device, and the transmission line connecting the second terminal device side is connected to the second terminal device. It has a transmission delay smaller than a transmission delay of a transmission line connecting the first terminal device side, and performs transfer control of data transmitted and received between the first terminal device and the second terminal device. In the data distribution management device, when a data to be transmitted from the second terminal device to the first terminal device is received, whether a temporary delivery acknowledgment is created and transmitted to the second terminal device A first determining means for determining whether the first terminal device has the temporary transmission acknowledgment, and a transmission buffer for temporarily storing data determined to be transmitted by the first terminal device; , Of the data transmitted from the second terminal device When the second determination means for determining whether the failed signal, said first determination means determines that creates and sends a delivery acknowledgment of the temporary, the second
Transferring the data transmitted from the terminal device to the first terminal device side, storing the data in the transmission buffer, and determining that the reception of the data has failed by the second determination means. First transfer control means for performing retransmission processing of the data stored in the transmission buffer;
A reception buffer for temporarily storing data transmitted from the terminal device, a reception window size holding unit for holding a reception window size of the second terminal device, and a reception buffer corresponding to the reception window size. A second transfer control means for controlling a transfer speed of the temporarily stored data.

According to the present invention, when the first determining means receives data to be transmitted from the second terminal device to the first terminal device, the first determining means creates a provisional delivery acknowledgment response, and It is determined whether or not to transmit to the second terminal device, and the transmission buffer temporarily stores the data determined by the first determination unit to generate and transmit the temporary delivery acknowledgment, Determining whether the first terminal device has failed to receive the data transmitted from the second terminal device, and determining whether the first transfer control device has received the first determination device. Transfers the data transmitted from the second terminal device to the first terminal device and stores the data in the transmission buffer when it determines that the temporary delivery acknowledgment is created and transmitted. And the second determination means fails to receive the data. If it is determined that performs retransmission processing of the data accumulated in the transmission buffer. Further, a reception buffer temporarily stores data transmitted from the first terminal device, a reception window size holding unit holds a reception window size of the second terminal device, and a second transfer unit. However, control is performed to adjust the transfer rate of data temporarily stored in the reception buffer according to the reception window size.

A data distribution management device according to the next invention is arranged on a transmission line between a first terminal device and a second terminal device, and the transmission line connecting the second terminal device is connected to the second terminal device. It has a transmission delay smaller than a transmission delay of a transmission line connecting the first terminal device side, and performs transfer control of data transmitted and received between the first terminal device and the second terminal device. In the data distribution management device, when a data to be transmitted from the second terminal device to the first terminal device is received, whether a temporary delivery acknowledgment is created and transmitted to the second terminal device A first determining means for determining whether the first terminal device has the temporary transmission acknowledgment, and a transmission buffer for temporarily storing data determined to be transmitted by the first terminal device; , Of the data transmitted from the second terminal device When the second determination means for determining whether the failed signal, said first determination means determines that creates and sends a delivery acknowledgment of the temporary, the second
Transferring the data transmitted from the terminal device to the first terminal device side, storing the data in the transmission buffer, and determining that the reception of the data has failed by the second determination means. First transfer control means for performing retransmission processing of the data stored in the transmission buffer;
Window size obtaining means for obtaining information on the window sizes of the first terminal device and the second terminal device for each connection between the terminal device and the second terminal device; and Holds the acquired window size information for each connection,
It is characterized by comprising management means for managing, and second transfer control means for performing control for adjusting the data transfer rate for each connection in accordance with the window size managed by the management means.

According to this invention, the first judging means creates a temporary delivery acknowledgment when receiving data to be transmitted to the first terminal from the second terminal, and It is determined whether or not to transmit to the second terminal device, and the transmission buffer temporarily stores the data determined by the first determination unit to generate and transmit the temporary delivery acknowledgment, Determining whether the first terminal device has failed to receive the data transmitted from the second terminal device, and determining whether the first transfer control device has received the first determination device. Transfers the data transmitted from the second terminal device to the first terminal device and stores the data in the transmission buffer when it determines that the temporary delivery acknowledgment is created and transmitted. And the second determination means fails to receive the data. If it is determined that performs retransmission processing of the data accumulated in the transmission buffer. A window size acquiring unit acquires window size information of the first terminal device and the second terminal device for each connection between the first terminal device and the second terminal device; The management means holds and manages information on the window size for each connection acquired by the window size acquisition means, and the second transfer control means:
Control is performed to adjust the data transfer rate for each connection in accordance with the window size managed by the management means.

[0021] The data distribution management device according to the next invention is the data distribution management device according to the above invention, wherein the second terminal device determines whether reception of data transmitted from the first terminal device has failed. Retransmission control for retransmitting data stored in the reception buffer when the third determination means determines that reception of the data transmitted from the first terminal device has failed. Means.

According to the present invention, the third determining means determines whether the second terminal device has failed to receive the data transmitted from the first terminal device, However, when the third determination means determines that the reception of the data transmitted from the first terminal device has failed, retransmission processing of the data stored in the reception buffer is performed.

[0023] In the data distribution management device according to the next invention, in the above-mentioned invention, the retransmission control means, when performing the data retransmission processing, performs the data retransmission processing and temporarily checks the tentative delivery of the data. A response is created and transmitted to the first terminal device.

According to the present invention, the retransmission control means includes:
When performing the data retransmission processing, the data retransmission processing is performed, and a provisional acknowledgment response to the data is created and transmitted to the first terminal device.

[0025] In the data distribution management device according to the next invention, the data distribution management device according to the above invention retains information as to whether or not retransmission processing has been performed on the data transmitted from the first terminal device. And a fourth determination unit for determining whether the data has been retransmitted, wherein the retransmission control unit performs a retransmission process of the data stored in the reception buffer in response to the reception failure. When performing the above, the fourth
When the determination means determines that retransmission has been completed, control is performed to prevent the data from being retransmitted.

According to the present invention, the fourth judging means holds information as to whether or not retransmission processing has been performed on the data transmitted from the first terminal device, and based on the information, It is determined whether or not the data has been retransmitted, and when the retransmission control means performs retransmission processing of the data stored in the reception buffer in response to the reception failure, the fourth determination means When it is determined that retransmission has been completed, control is performed so that the data is not retransmitted.

[0027] In the data distribution management device according to the next invention, in the above invention, a high-speed transfer determination means for determining whether or not the transmitted / received data should be transferred at a high speed;
If the high-speed transfer determining means determines that the transmitted / received data should be transferred at a high speed, the charge associated with the high-speed transfer is charged to the first terminal device or the second
And charging means for charging the user of the terminal device.

According to the present invention, the high-speed transfer judging means:
It is determined whether or not the transmitted / received data should be transferred at a high speed. When the charging unit determines that the transmitted / received data should be transferred at a high speed, The charging is performed on the user of the first terminal device or the second terminal device of the transmission source.

[0029] In the data distribution management device according to the next invention, in the above invention, when the accounting unit determines that the transmitted / received data should be transferred at a high speed, The billing content accompanying the speeding-up is presented to the first terminal device or the second terminal device of the transmission source, and the speeding-up is performed for the user of the first terminal device or the second terminal device. Input request means for requesting input of information as to whether or not to perform, the charging means, when the input request means receives a notification that speeding up, the high-speed transfer of the transmitted and received data Is characterized in that a billing process associated with is performed.

According to the present invention, when the input requesting means determines that the data to be transmitted / received should be transferred at high speed, the input request means transmits the billing content accompanying the speeding up to the transmission source. Requesting the first terminal device or the second terminal device to input information on whether or not to speed up the user of the first terminal device or the second terminal device And when the input requesting unit receives a notification that speeding up is performed, the charging unit performs a charging process accompanying the high-speed transfer of the transmitted / received data.

[0031] A data distribution management system according to the next invention is characterized in that the data distribution management device according to any one of claims 1 to 9 includes the data distribution management device between the first terminal device and the second terminal device. A transmission path, wherein the transmission path is disposed at an end of the transmission path having a transmission delay greater than that of the transmission path connecting the first terminal apparatus or the second terminal apparatus.

According to the present invention, the data distribution management device according to any one of the above inventions is a transmission path between the first terminal device and the second terminal device, Two-way communication is realized by arranging the first terminal device or the second terminal device at an end of a transmission line having a transmission delay greater than that of the transmission line connecting the second terminal device.

The data distribution management system according to the next invention is the data distribution management system according to the above invention, wherein the transmission line having a transmission delay larger than the transmission line connecting the first terminal device or the second terminal device is: It is a satellite line.

According to the present invention, a transmission line having a larger transmission delay than a transmission line connecting the first terminal device or the second terminal device is realized as a satellite line.

The data distribution management method according to the next invention is arranged on a transmission line between the first terminal device and the second terminal device, and the transmission line connecting the second terminal device side is connected to the second terminal device. Data distribution management having a transmission delay smaller than a transmission delay of a transmission line connecting one terminal device side and transferring at least data transmitted from the first terminal device to the second terminal device side; A receiving window size holding step of holding a receiving window size of the second terminal device; a receiving buffer step of temporarily storing data transmitted from the first terminal device; And a transfer control step of controlling the transfer rate of the data temporarily stored in the reception buffer.

According to the present invention, the receiving window size of the second terminal device is held in the receiving window size holding step, and the data transmitted from the first terminal device is temporarily stored in the receiving buffer step. Store,
In the transfer control step, control is performed to adjust the transfer rate of the data temporarily stored in the reception buffer according to the reception window size.

The data distribution management method according to the next invention is arranged on a transmission path between the first terminal apparatus and the second terminal apparatus, and the transmission path connecting the second terminal apparatus side is connected to the second terminal apparatus. The first terminal device has a transmission delay smaller than a transmission delay of a transmission line connecting the first terminal device side, and performs transfer control of data transmitted and received between the first terminal device and the second terminal device. In the data distribution management method, window size acquisition for acquiring window size information of the first terminal device and the second terminal device for each connection between the first terminal device and the second terminal device And a management step of holding and managing window size information for each connection acquired in the window size acquisition step, and temporarily storing data transmitted from the first terminal device. A receiving buffer step, and a transfer controlling step of controlling a transfer rate of data stored by the receiving buffer step for each connection corresponding to a window size managed by the managing step. And

According to the present invention, the first terminal device and the second terminal device are connected to each other between the first terminal device and the second terminal device by the window size process.
Acquiring the window size information of the terminal device of the terminal device, and holding and managing the window size information of each connection acquired by the window size acquiring step by the management step, and receiving the window size information by the reception buffer step. Temporarily store the data sent from the terminal device,
In the transfer control step, control is performed to adjust the transfer rate of the data stored by the reception buffer step for each connection corresponding to the window size managed by the management step.

The data distribution management method according to the next invention is arranged on a transmission line between the first terminal device and the second terminal device, and the transmission line connecting the second terminal device side is connected to the second terminal device. The first terminal device has a transmission delay smaller than a transmission delay of a transmission line connecting the first terminal device side, and performs transfer control of data transmitted and received between the first terminal device and the second terminal device. In the data distribution management method, when data to be transmitted from the second terminal device to the first terminal device is received, whether a temporary acknowledgment is created and transmitted to the second terminal device A transmission buffering step of temporarily storing data determined to create and transmit the provisional acknowledgment response; and that the first terminal device comprises: , Of the data transmitted from the second terminal device When the second determination step of determining whether the failure signal, the first determination step determines that creates and sends a delivery acknowledgment of the temporary, the second
Transferring the data transmitted from the terminal device to the first terminal device side, accumulating the data in the transmission buffer, and determining that the second determination step has failed in receiving the data. A first transfer control step of performing retransmission processing of the data stored in the transmission buffer;
A receiving buffer step for temporarily storing data transmitted from the terminal device; a receiving window size holding step for holding a receiving window size of the second terminal device;
A second transfer control step of controlling a transfer rate of data temporarily stored in the reception buffer according to the reception window size.

According to the present invention, in the first judging step, when data to be transmitted from the second terminal device to the first terminal device is received, a temporary acknowledgment is created and the first acknowledgment is generated. And determining whether or not to transmit to the second terminal device, and temporarily storing data determined by the first determining step to create and transmit the temporary delivery acknowledgment by the transmission buffering step, Determining whether or not the first terminal device has failed to receive the data transmitted from the second terminal device in the first transfer control step. Transfers the data transmitted from the second terminal device to the first terminal device and stores the data in the transmission buffer when it determines that the temporary delivery acknowledgment is created and transmitted. And
When the second determination step determines that the reception of the data has failed, a retransmission process of the data stored in the transmission buffer is performed. The receiving buffer step temporarily stores data transmitted from the first terminal device, and the receiving window size holding step temporarily stores the data transmitted from the first terminal apparatus.
The second transfer control step controls the transfer rate of the data temporarily stored in the reception buffer in accordance with the reception window size.

The data distribution management method according to the next invention is arranged on a transmission line between the first terminal device and the second terminal device, and the transmission line connecting the second terminal device side is connected to the second terminal device. The first terminal device has a transmission delay smaller than a transmission delay of a transmission line connecting the first terminal device side, and performs transfer control of data transmitted and received between the first terminal device and the second terminal device. In the data distribution management method, when data to be transmitted from the second terminal device to the first terminal device is received, a temporary delivery acknowledgment is created and transmitted to the second terminal device. A first buffering step for temporarily storing data determined to create and transmit the temporary delivery acknowledgment, the first terminal device comprising: Is the data transmitted from the second terminal device. A second determining step of determining whether or not the reception has failed, and transmitting from the second terminal device when the first determining step determines that the provisional acknowledgment is created and transmitted. Transfer the received data to the first terminal device side, accumulate the data in the transmission buffer, and, when the second determination step determines that the reception of the data has failed, store the data in the transmission buffer. A first transfer control step of performing retransmission processing of the stored data, and the first terminal device and the second terminal for each connection between the first terminal device and the second terminal device A window size acquisition step of acquiring window size information of the device; a management step of holding and managing window size information for each connection acquired in the window size acquisition step; Characterized in that it comprises a second transfer control step of performing control for adjusting the transfer rate of the data corresponding to the window size for each connection to be managed by.

According to the present invention, in the first determining step, when data to be transmitted from the second terminal device to the first terminal device is received, a temporary delivery confirmation response is generated and Determine whether to transmit to the second terminal device,
The transmission buffering step temporarily accumulates the data determined by the first determining step to create and transmit the temporary delivery acknowledgment, and the second determining step allows the data to be temporarily stored.
The terminal device determines whether or not the reception of the data transmitted from the second terminal device has failed, and the first retransmission control step allows the first determination step to transmit the temporary delivery acknowledgment. When it is determined to create and transmit, the data transmitted from the second terminal device is transferred to the first terminal device side, and the data is accumulated in the transmission buffer; If it determines that the reception of the data has failed, it performs retransmission processing of the data stored in the transmission buffer. Also. A window size obtaining step of obtaining window size information of the first terminal device and the second terminal device for each connection between the first terminal device and the second terminal device; And holds and manages the information on the window size for each connection obtained in the window size obtaining step. The second transfer control step allows each connection to correspond to the window size managed by the management step. Control for adjusting the data transfer speed is performed every time.

The data distribution management method according to the next invention is the data distribution management method according to the above invention, wherein the second terminal device determines whether reception of data transmitted from the first terminal device has failed. And a retransmission control for retransmitting data stored in the reception buffer when the third determination step determines that reception of data transmitted from the first terminal device has failed. And a step.

According to the present invention, in the third determining step, the second terminal device determines whether or not the reception of the data transmitted from the first terminal device has failed, and the retransmission controlling step is performed. Accordingly, when the third determining step determines that the reception of the data transmitted from the first terminal device has failed, the data stored in the reception buffer is retransmitted.

[0045] In a data distribution management method according to the next invention, in the above-mentioned invention, the retransmission control step, when performing the data retransmission processing, performs the data retransmission processing and temporarily checks the tentative delivery of the data. A response is created and transmitted to the first terminal device.

According to the present invention, the retransmission control step includes:
When performing the data retransmission processing, the data retransmission processing is performed, and a provisional acknowledgment response to the data is created and transmitted to the first terminal device.

[0047] In the data distribution management method according to the next invention, in the above invention, information is stored as to whether or not retransmission processing has been performed on the data transmitted from the first terminal device. A fourth determining step of determining whether or not the data has been retransmitted, wherein the retransmitting control step includes a step of retransmitting the data stored in the reception buffer in response to the reception failure. When performing the above, the fourth
When it is determined that the data has been retransmitted in the determination step, control is performed to prevent the data from being retransmitted.

According to the present invention, in the fourth determining step, information is stored as to whether or not the data transmitted from the first terminal apparatus has been retransmitted, and based on the information, It is determined whether or not the data has been retransmitted, and when the retransmission control step performs a retransmission process of the data stored in the reception buffer in response to the reception failure, the fourth determination step is performed. When it is determined that retransmission has been completed, retransmission processing of the data is not performed.

[0049] In the data distribution management method according to the next invention, in the above-mentioned invention, a high-speed transfer determination step of determining whether the transmitted / received data should be transferred at a high speed,
If the high-speed transfer determining step determines that the transmitted / received data should be transferred at a high speed, the charge associated with the high-speed transfer is charged to the first terminal device or the second
And charging the user of the terminal device.

According to this invention, the high-speed transfer determining step determines whether or not the transmitted / received data should be transferred at a high speed, and the charging step allows the high-speed transfer determining step to transfer the transmitted / received data at a high speed. When it is determined that the transfer is to be performed, the charge associated with the speed-up is charged to the user of the first terminal device or the second terminal device as the transmission source.

[0051] In the data distribution management method according to the next invention, in the above invention, in the charging step, when the high-speed transfer determination step determines that the transmitted / received data should be transferred at a high speed, The billing content accompanying the speed-up is presented to the first terminal device or the second terminal device of the transmission source, and the speed is increased for the user of the first terminal device or the second terminal device. An input requesting step of requesting input of information on whether or not to perform, the charging step includes a step of, when the input requesting step receives a notification that speeding up is performed, transferring the transmitted / received data at a high speed. Is characterized in that a billing process associated with is performed.

According to the present invention, when the high-speed transfer determining step determines that the transmitted / received data should be transferred at a high speed in the input requesting step, the billing content accompanying the speeding-up is transmitted to the transmission source. Requesting the user of the first terminal device or the second terminal device to input the information as to whether or not to perform the speeding-up of the first terminal device or the second terminal device Performing the charging step,
In the input requesting step, when a notification that speeding is performed is received, a billing process associated with the high-speed transfer of the transmitted / received data is performed.

A program according to the next invention is a program for causing a computer to execute the method according to any one of the claims, and the program becomes machine-readable, whereby the program according to any one of the claims can be read. The operations can be performed by a computer.

[0054]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram showing a data distribution management system according to the present invention; Embodiments will be described in detail.

Embodiment 1 FIG. 1 is a block diagram showing a configuration of a data distribution management system including a data distribution management device according to Embodiment 1 of the present invention. In FIG. 1, the data distribution management system includes a terminal device C1 connected to a data distribution management device 10 via a line 2a, a data distribution management device 10 connected to a data distribution management device 20 via a line 3, Delivery management device 20 is line 2
b to the terminal device C2. The line 3 is a line with a large transmission delay such as a satellite line, and the lines 2a and 2
The line b has a smaller transmission delay than the line 3. TCP communication is performed between the terminal devices C1 and C2.

The data distribution management device 10 has a gateway function unit 10a, a distribution management table 1, a protocol management table 5, a transmission buffer 6, and a reception buffer 7. The gateway function unit 10a is a communication unit 17 that performs input / output processing of data packets with the terminal device C1, and a communication that performs input / output processing of data packets with the terminal device C2 via the data distribution management device 20. Unit 11 and tmpACK for storing a data packet for creating a provisional acknowledgment (tmpACK)
A buffer 4 and a tmpACK use determination unit 12 that determines whether to return a tmpACK to a data packet transmitted to the terminal device C2, and creates a tmpACK based on the data packet received from the terminal device C1. tmpACK creating unit 13, SGTimer counting unit 14 that counts up the timeout period (SGTimer) of the delivery confirmation response for each data packet, and generates a timeout event waiting for the delivery confirmation response. And a distribution data recording unit 15 that writes the information about the presence or absence and the information on the delivery confirmation response from the terminal device C2 into the delivery management table 1. SG distribution management unit 16 to manage To.

In FIG. 1, the transmission buffer 6, the reception buffer 7, and the tmpACK buffer 4 are shown as separate buffers, respectively. You may do so. In addition, a management table (not shown) is provided which can be used together with information including control information according to a management purpose, regardless of whether it is implemented as a separate buffer or as the same buffer. By mounting the packet data so that the storage location of the packet data can be identified, the efficiency of management and search can be improved.

The data distribution management device 20 has the same configuration as the data distribution management device 10. Data distribution management device 1
0 transfers the data packet transmitted from the terminal device C1 to the terminal device C2 via the data distribution management device 20. At this time, the data distribution management device 10
The use determining unit 12 determines whether or not to apply the tmpACK return function to the data packet received from the terminal device C1, and if it is determined that the tmpACK return function is to be applied, the temporary determination unit 12 sends a temporary data packet to the terminal device C1. The data delivery management device 20 returns the arrival confirmation response (tmpACK), and transfers the data packet sent from the data delivery management device 10 to the terminal device C2 in the same manner as a normal gateway. And adjusts the transfer rate of the data packet according to the window size of the terminal device C2.

The data distribution management device 20 transfers the data packet transmitted from the terminal device C2 to the terminal device C1 via the data distribution management device 10. At this time, the data distribution management device 20 sets the tmpACK
It is determined whether or not to apply the tmpACK return function to the data packet received from the terminal device C2, and if it is determined to be applied, the tmpACK for the transmitted data packet is returned to the terminal device C2,
The data distribution management device 10 transfers the data packet sent from the data distribution management device 20 to the terminal device C1 as in the case of a normal gateway. At this time, the data packet is buffered and the window of the terminal device C1 is The transfer speed of the data packet is adjusted according to the size. Thereby, bidirectional communication between the terminal devices C1 and C2 is realized. The two data distribution management devices 10,
When transferring data received from the lines 2a and 2b with a small delay to the line 3 with a long delay, the device 20 functions as a normal router, creates a provisional delivery acknowledgment, temporarily stores the data to be transferred, It is determined whether or not the data has been successfully received at the destination, and if it is determined that the reception has failed at this destination, the data is retransmitted (see the flowchart shown in FIG. 6 described later).

Here, the data distribution management processing of the data distribution management device 10 will be described with reference to FIGS. First, the communication units 17 and 1 of the gateway function unit 10a
1 receives the data packet, temporarily stores the received data packet in the reception buffer 7, and the SG distribution management unit 16 performs the distribution processing shown in FIG.

In FIG. 2, first, the data distribution management device 10 determines whether or not the data is received from the line 3 having a long delay and is to be transferred to the terminal device C1 as the destination via the line 2a having a small delay. (Step S11). If the data is received from the line 3 having a long delay and is to be transferred to the line 2a having a small delay (S11, YES), the data distribution management device 10 processes the packet from the delay line, that is, reduces the window size of the terminal device C1. The data transfer speed is adjusted accordingly (step S12), and the process ends. The details of the packet processing from the delay line will be described later.

On the other hand, when the data is not the data received from the line 3 having a long delay, that is, the data is received from the terminal device C1 via the line 2a having a small delay, and is transmitted to the destination (terminal device C2) via the line 3 having a long delay. If the data is to be transferred (step S11, NO), the tmpACK use candidate packet is processed (step S13). That is,
The tmpACK usage determining unit 12 checks the received data packet, and, based on the check result, determines whether the received data packet has the t
The "ON" and "OFF" of the mpACK available flag are determined, and the "tmpACK available flag"
The information of the received data packet, including "N" and "OFF", is registered in the distribution management table 1 (step S13). Details of the processing of the tmpACK use candidate packet will be described later.

Thereafter, it is determined whether or not the use control of the tmpACK is performed based on the tmpACK control flag (step S14). If the use control of tmpACK is not performed (step S14, NO), the received data is transferred to the destination as it is (step S15), and the process ends. On the other hand, when tmpACK usage control is performed (step S14, YES), tmpACK usage control processing is executed (step S15), and this processing ends. Details of the tmpACK use control process will be described later.

FIG. 3 is a flowchart showing a procedure for processing a packet from a delay line in step S12 shown in FIG. In FIG. 3, when a data segment received via the line 3 with a long delay and transferred to the line 2a with a small delay is received, first, the data is of a communication managed by the data (determined by a combination of IP and port). )
In addition, according to the ACK flag of the code bit (CodeBit) and the direction of data transmission in this communication (data in which the transmission and reception in the distribution management table are opposite to each other is determined to be ACK), the received data segment is ACK. It is determined whether the segment is a segment (step S
21). For example, if only the communication shown in FIG. 4 is managed, the source IP is “10.74.3.200”, the source port is “1301”, the destination IP is “10.74.3.177”,
The data whose destination port is “FTP.DATA” and whose ACK flag is “ON” is determined to be ACK.

If the received data segment is not an ACK segment (step S21, NO), it is further determined from the destination window information in the distribution management table 1 whether or not the destination reception buffer is sufficient. (Step S22).

If the destination reception buffer is sufficient (step S22, YES), the data is transferred to the destination (terminal device C1) via the line 2a with a small transmission delay (step S25), and this processing ends. On the other hand, if the destination reception buffer is not sufficient (step S22, NO), the data to be transferred is temporarily stored in the reception buffer 7 (step S22).
23) suspend data transfer until it can be confirmed from the destination window information that the destination receive buffer has been sufficiently recovered, refer to the window field of the TCP header of the data segment from the destination, obtain window size information, The data is recorded in the distribution management table 1, and based on this window size information, when it is determined that the reception buffer at the destination becomes sufficient, the data transfer is restarted, thereby adjusting the data transfer speed (step). S2
4). Thereafter, data is transferred to the destination (terminal device C1) via the line 2a with a small transmission delay (step S25), and this processing ends.

On the other hand, if the received data segment is ACK
If it is a segment (step S21, YES), it is determined whether or not the received data segment is a delivery acknowledgment from the destination. The received data segment is stored, and an event notifying that the delivery confirmation response from the destination has been received is generated in the reception confirmation processing and the retransmission processing by the SG distribution management unit 16 (step S26). The reception confirmation processing and the retransmission processing will be described later.

Then, referring to the distribution management table 1,
It is determined whether this ACK segment is to be transferred based on the tmpACK transmission status, that is, whether the ACK segment has been transmitted (step S27). If the ACK segment has been transmitted (step S27, NO), this process is performed. When the ACK segment has not been transmitted (step S27, YES), the process proceeds to step S22. If the window size of the destination is sufficient as described above, the ACK segment is transferred as it is, and If the window size is not sufficient, the data transfer rate is adjusted to transfer the ACK segment, and then the process is terminated.

FIG. 4 is a diagram showing an example of the distribution management table 1. As shown in FIG. In FIG. 4, items D11 to D15
Is an item representing information on communication with the same management unit, and items D16 to D18 are items representing information on data packets received by the data distribution management device 10 in communication with the same management unit. Items D11 to D18
Is information obtained from the data packet received by the data distribution management device 10. Item D11 indicates the source IP address of the communication to be managed, and item D12 indicates the destination I
Item D13 indicates a source port number, item D14 indicates a destination port number, and item D1
Reference numeral 5 represents the latest transmission window size and the latest reception window size at the transmission source and the destination, respectively. Item D16 indicates the sequence number of the data segment received by the data distribution management device 10 in this communication, and item D17 indicates information related to tmpACK transmission. The information of this item D17 includes information on whether or not the packet is a transmittable data packet and information on whether or not a tmpACK has been transmitted, including conditional cases such as when certain conditions are satisfied for the transmission source. Are used as values. Item D18 represents information on the delivery acknowledgment (RRACK) from the destination. In FIG. 4, the corresponding data packet is RRAC.
"ACK received" indicating that K has been received and R
“A” indicating that the device is waiting for the arrival of RACK
CK wait ".

Further, an item D19 is an item indicating a “retransmission at the receiving GW (gateway)” flag.
When transferring a data segment received from a source via a line with a long delay to a destination via a line with a small delay, buffer the data segment to be transferred,
And information indicating whether or not it is responsible for retransmission,
As a value, when the data segment is transferred from a line with a long delay to a line with a small delay, and when it is responsible for retransmission, it is set to "used" and the data segment is transferred from a line with a long delay to a line with a small delay. And you are not responsible for resending,
In a case where the data segment is not transferred from a line with a long delay to a line with a short delay, the value has a value of “NULL”.

For example, in FIG.
The transmission port `` FTP.D '' of the source terminal device `` 10.74.3.177 ''
In the communication from the ATA to the destination port "1301" of the destination terminal device "10.74.3.200", the transmission window size and the reception window size of the transmission source and the transmission window size and the reception window size of the destination are all 16K bytes. , The data segment having the sequence number “398” is a data segment in which transmission of tmpACK is “impossible”, that is, a data segment in which tmpACK is not transmitted under any condition. Indicates that the device is in a waiting state, and the own data distribution management device transfers the data segment from a line with a long delay to a line with a small delay and is responsible for retransmission. Is shown.

In FIG. 5, the line DD2 contains the transmission port “FTP.DAT” of the source terminal device “10.74.3.177”.
From "A" to the destination port "1301" of the destination terminal device "10.74.3.200", the source transmission window size and reception window size, and the destination transmission window size and reception window size are all
A data segment having 16K bytes and having a sequence number of “398” is a data segment in which transmission of tmpACK is “impossible”, that is, a data segment in which tmpACK is not transmitted under any condition, and This indicates that the device is in a state of waiting for a delivery acknowledgment, and that the data distribution management device does not transfer a data segment from a line with a large delay to a line with a small delay.

The SG distribution management unit 16 uses the above-described items of the distribution management table 1 and the items added as necessary to manage the tmpACK of the data segment, confirm reception, and control retransmission according to the reception result. , TmpACK to the source and R acknowledgment from the destination
RACK transmission rate control, transfer rate control to destination,
The transmission buffer 6 and the reception buffer 7 of the data distribution management device 10 can be managed.

Next, the procedure of processing the tmpACK use candidate packet in step S13 will be described with reference to the flowchart shown in FIG. When it is determined that the data is not data from the line 3 with a long delay (step S
11, NO), first, it is determined whether or not the received data segment is a data segment at the start of communication by referring to a code bit (CodeBit) in a header portion of the received data segment (step S31).

When the received data segment is the data segment at the start of communication (step S31, YE
S) Further, referring to the distribution management table 1, it is determined whether or not the communication start procedure is correct (step S3).
2). Whether the communication start procedure is correct is determined by, for example, the distribution management table 1 and the T of the received data segment.
Referring to the CP header, it is a SYN packet not registered in the distribution management table 1 or a TCP 3
The determination is made based on whether the data segment according to the procedure of the handshake method is received from the transmission source and the destination.

When it is determined that the communication start procedure is correct (step S32, YES), the distribution management table 1
, An entry relating to the data segment is added (step S33), the received data packet is transferred to the destination (step S34), and the present process ends. On the other hand, if it is determined that the communication procedure is not correct (step S3
2, NO), tmpACK available flag is “OFF”
(Step S35), and thereafter, the received data packet is transferred to the destination (step S34), and the process ends.

On the other hand, if the received data segment is not the data segment at the start of communication (step S31,
(NO), and it is further determined whether or not the communication is already registered on the distribution management table 1 (step S3).
6). This determination is made by referring to the source IP address and destination IP address in the IP header of the received data segment and the source port number and destination port number in the TCP header, and determining the source IP and the TCP in the IP header. The communication represented by the combination of the source port and the combination of the destination IP and the destination port is
This is performed depending on whether or not it exists on the distribution management table 1. If the received data segment is not registered in the distribution management table 1 (step S36, NO), t
The mpACK available flag is set to "OFF" (step S35), and the received data packet is transferred to the destination (step S34), and the process ends.

On the other hand, when the received data segment is registered in the distribution management table 1 (step S3
(6, YES), it is further determined whether or not the received data segment is a segment in the destination reception window (step S37). If the segment is within the destination reception window (step S37, YE
S) Further, the data is for communication managed by the data (determined by a combination of IP and port), and the ACK flag of the code bit (CodeBit) and the direction of data transmission in this communication (communication in the distribution management table) It is determined whether or not the received data segment is an ACK segment (step S38). For example, if only the communication shown in FIG. 4 is managed, the source IP is “10.74.3.200”, the source port is “1301”, the destination IP is “10.74.3.177”, and the destination port is “ FTP.DATA ”and the data whose ACK flag is“ ON ”are determined to be ACK. If it is not an ACK segment from the destination (step S38, NO), F
The IN flag is checked to determine whether the packet is a communication end packet (step S39).

If the received data segment is not a communication end packet (step S39, NO), it is further determined whether or not it is a window probe (step S39).
40). If it is a window probe (step S4
0, YES), and sets the tmpACK available flag to “OF
F "(step S41), the received data segment is transferred to the destination (step S34), and the process ends.

On the other hand, if the received data segment is not a window probe (step S40, NO), this information is registered in distribution management table 1, and tmpACK is registered.
The available flag is set to "ON" (step S4
2) Then, the received data segment is transferred to the destination (step S34), and this processing ends. Note that tm
The data segment for which the pACK available flag is set to “ON” is stored in the transmission buffer 6. This step S
When the process 42 is performed, the tmpAC is used as information at the time of arrival of the latest data segment for each information entry relating to each data segment in the distribution management table 1.
Set information on whether or not K is available. Thus, for example, at the time of a slow start, it is possible to perform fine control according to the state of the window size, such as not performing tmpACK use control.

On the other hand, if the received data segment is AC
If it is a K segment (step S38, YES),
A reception confirmation process and a retransmission process are performed (step S4).
3). In this process, the received data segment is set to tm
The data is stored in the pACK buffer 4, and an event for notifying that the delivery confirmation response has been received from the destination is generated in the reception confirmation processing and the retransmission processing by the SG distribution management unit 16 described later. Thereafter, it is determined whether or not to transfer this data segment (step S44). That is, referring to the distribution management table 1, the transmission status of tmpACK, that is, whether or not transmission has been completed, and whether the data is Pi in the ACK segment.
It is determined whether or not to transfer the ACK segment depending on whether or not ggyBack has been performed. If the tmpACK has been transmitted and the data has not been piggybacked (step S44, NO), this processing ends. Otherwise (step S44, YES), the received data segment is transferred to the destination (step S44, YES). Step S34), this process ends.

If the received data segment is the communication end segment (step S39, YES), the entry of the received data segment is registered, and the entry of the data segment in the same communication, and tmpAC
If K is available and tmpACK has not been transmitted, all tmpACKs are disabled and tmpACK is disabled.
The ACK use flag is set to “OFF”, the FIN received flag is set to “ON” (step S45), and then the received data segment is transferred to the destination (step S3).
4), end this processing.

Next, with reference to the flowchart shown in FIG. 7, the procedure of the reception confirmation process by the SG distribution management unit 16 of the data distribution management device 10 and the retransmission control process based on the result will be described. In FIG. 7, first, it is determined whether or not an event indicating the arrival of the delivery confirmation response has been received (step S51). This event occurs in step S2
7, an event generated in S43. When the delivery confirmation response has arrived (step S51, YE
S), it is determined whether the notification is a start notification from the destination (step S61), and if the notification is a start notification (step S6).
1, YES), and terminates this processing.

On the other hand, when it is determined that the notification is not a start notification from the destination (step S61, NO), the result for the data segment indicated by the received delivery confirmation response is entered in the distribution management table 1 (step S62). For example,
In the case of the communication without the SACK option, among the entries of the distribution management table 1, ACK reception is waiting, and
All the data segments whose sequence numbers are smaller than the data segment indicated by the received acknowledgment
Make K received. On the other hand, in the case of the communication with the SACK option, in the entry of the delivery management table 1, ACK
All data segments that are waiting for reception, have a smaller sequence number than the data segment indicated by the received acknowledgment response, and are not in the SACK option are all ACK received.

After the processing in step S62, the ACK-received segments in the entries of the distribution management table 1 are deleted from the transmission buffer 6 (step S63). Here, the deletion processing of the ACK reception segment may have a timer related to deletion, and may be collectively deleted at regular time intervals.

On the other hand, if it is determined in step S51 that an event of receiving a delivery confirmation response from the destination has not been received, it is further determined whether a retransmission timeout has occurred (step S52). If a retransmission timeout has not occurred (step S52, NO), the process ends. On the other hand, when it is determined that a retransmission timeout has occurred (step S52, YES), the number of retransmissions of the entry of the data segment in which the timeout has occurred in the distribution management table 1 is incremented, and the retransmission flag is set to “ON” (step S53). ), It is determined whether or not distribution has ended (step S54). Normal TCP
It is determined that the distribution has ended when the exchange of the data packet at the end of the distribution in the communication is detected, or when the data transmission management device 10 terminates the distribution by repeating the retransmission timeout and retrying out the retransmission (step S54). , YES), a distribution end process is performed (step S56), and this process ends. Note that the retransmission timeout value and the number of retry outs need to be set sufficiently longer than the retransmission timeout value and the number of retry outs in the terminal devices C1 and C2.

On the other hand, if it is determined in step S54 that distribution has not been completed, retransmission processing in steps S57 to S59 is performed. That is, in step S57, the data segment of the transmission buffer 6 for which the retransmission flag of the distribution management table 1 is "ON" is retransmitted, and the retransmission flag of the distribution management table 1 is set to "OFF". After the process in step S57, the retransmission timer is reset (step S58), the retransmission number counter of the data distribution management device 10 is incremented (step S59), and the process ends.

Next, the tmpACK use control processing procedure in step S15 will be described with reference to the flowchart shown in FIG. In FIG. 8, first, the FI set by a series of processes in step S13 is set.
With reference to the value of the N received flag, it is determined whether the FIN packet has been received, that is, whether the communication end segment has been received (step S71). When the communication end segment has been received (step S71, YE
S), the process is terminated as it is.

On the other hand, if the communication end segment has not been received (step S71, NO), the data segment stored in the tmpACK buffer 4 is (SYN + AC
K) It is determined whether or not it is a segment (step S7)
2). If it is a (SYN + ACK) segment (step S72, YES), transfer is performed if the (SYN + ACK) segment has not been transferred to the destination (step S72).
73), end this processing.

On the other hand, if the segment is not a (SYN + ACK) segment (step S72, NO), the tmpAC
It is determined whether a segment necessary for K transmission has been received (step S74). The processing in step S74 is determined by, for example, the implementation that the tmpACK can be created for the data segment X when one or more data segments having a sequence number subsequent to the data segment X for which tmpACK is to be created are received. Is done.

Here, when a data segment necessary for tmpACK transmission has not been received (step S74, N
O) If there is an untransmitted ACK segment in the tmpACK buffer 4, the ACK segment is transferred to the transmission source (step S73), and the process ends.

On the other hand, when a data segment required for tmpACK transmission has been received (step S74, YE
S), a data segment from the transmission source for which tmpACK is to be created is determined (step S75). In the process of step S75, the process is performed by using the distribution management table 1, referring to the window size of the transmission source, the tmpACK transmission status, the SACK option of the TCP protocol between the terminal devices C1 and C2, and the like. For example, SAC
In the case of communication without the K option, of the entries in the distribution management table 1, ACK reception is awaited and tmp
Among the data segments that have not transmitted the ACK and all of the data segments whose sequence numbers are smaller than the own data segment are received by the data distribution management device, the data segment whose sequence number is the second largest is
Determined as a tmpACK creation target.

Thereafter, the data segment in which the acknowledgment number of the data segment stored in the tmpACK creation buffer is rewritten to a number obtained by adding “1” to the sequence number of the data segment to be created in tmpACK determined in step S75, It is created as tmpACK (step S76). T with SACK option
In the case of the CP, it is possible to determine the tmpACK creation target in consideration of the SACK option in step S75, and to implement the delivery acknowledgment response including the SACK option in step S76. After the processing in step S76, the tmpACK is transmitted to the transmission source (step S77). At this time, at the same time, tmpAC
The count of the retransmission timer for the data segment targeted for K is started. After the processing of step S77,
The information of the data segment entered on all the distribution management tables 1 corresponding to the transmitted tmpACK is
tmpACK has been transmitted (step S78), and the process ends.

In the first embodiment, when the data distribution management devices 10 and 20 perform communication, they hold information on the window sizes of both the transmission source and the destination and receive the information via a line with a small delay. When transmitting a data segment to a destination via a line with a large delay, the data segment is transferred to the destination, a temporary delivery acknowledgment is created and transmitted if necessary, and the temporary The data segment targeted for the delivery acknowledgment is temporarily held, and when the delivery confirmation response cannot be received from the destination within a certain period of time, the data delivery management device retransmits the data segment. The original window size is prevented from being reduced, and the reliability mechanism of TCP is guaranteed.

Further, the signal is received via a line having a large delay,
When transferring a data segment to a destination via a line with a small delay, based on information on the window size of the destination,
The reception buffer is judged to be empty, and if the reception buffer is not sufficient, the transfer data is temporarily held in the data distribution management device, the transfer to the destination is suspended until the reception buffer at the destination becomes sufficient, and the reception at the destination is stopped. Since data transfer is resumed when it is determined that the buffer is sufficient, it is possible to prevent the destination receive buffer from overflowing due to a delay in information related to a reduction in window size due to transmission delay. In addition, all data is reliably transferred without being inconsistent with the reception confirmation at the destination, congestion between the data distribution management device and the transmission source or destination can be suppressed, and highly reliable and high-speed communication can be realized.

Embodiment 2 Next, a second embodiment of the present invention will be described. In the second embodiment, retransmission control is further performed in the data distribution management devices 10 and 20 on the receiving side, the necessity of retransmission is quickly determined, and the flow on the line 3 with a large delay is reduced. The time required for retransmission is reduced. Although the configuration and operation of the second embodiment are the same as those shown in FIGS. 1 and 2, the details of the operation are different.

FIG. 9 is a flowchart showing a processing procedure according to the second embodiment corresponding to step S12 shown in FIG. In FIG. 9, first, the data is of the communication managed (determined by the combination of the IP and the port), the ACK flag of the code bit (CodeBit) and the direction of data transmission in this communication (in the distribution management table). It is determined whether or not the received data segment is an ACK segment by determining that the data whose communication and transmission / reception are opposite is ACK (step S81). For example, if the communication managed is only the one shown in FIG. 4, the source IP is “10.74.3.20
0. ", the source port is" 1301 ", and the destination IP is" 10.74.3.
177 ", destination port is" FTP.DATA "and AC
Data for which the K flag is “ON” is determined to be ACK.
If not an ACK segment (step S81, N
O), it is determined whether or not the communication is already registered in the distribution management table 1 and whether or not to perform transfer (step S).
82). Whether or not the communication has already been registered in the distribution management table 1 is determined by the communication in which the combination of the source IP in the IP header and the source port in the TCP header and the combination of the destination IP and the destination port are all the same. , And if they are all the same, it is determined that the communication is a registered communication. The case where the transfer is performed in the determination of whether to perform the transfer is as follows. That is, if the SYN packet is a communication of the correct destination and source address of the unregistered communication (a correct format IP address), or if the communication is a registered communication and the retransmission flag by the data distribution management device on the receiving side. Is not used.

If it is determined in step S82 that the transfer is to be performed (step S82, YES), if there is no entry for this communication in distribution management table 1, an entry for this communication and an entry for this data segment are additionally registered, If there is an entry for the communication to be transferred, a process for additionally registering an entry for this data segment is performed (step S83).

Thereafter, it is determined from the information on the destination receiving window in the distribution management table 1 whether or not the destination receiving buffer 7 is sufficient (step S84). If it is determined that the destination reception buffer 7 is sufficient (step S84, YES), it is determined whether or not retransmission by the data distribution management device on the receiving side is to be used (step S8).
5). The process of determining whether or not to use retransmission by the data distribution management device on the receiving side may be performed, for example, by providing a flag in advance as to whether or not to use retransmission by the data distribution management device on the receiving side. Use judgment is made based on the value. The data distribution management device on the receiving side is, for example, the data distribution management device 2 when data is transmitted from the terminal device C1 to the terminal device C2.
Means 0.

Thereafter, when retransmission by the data distribution management device on the receiving side is used (step S85, YES), a series of processes for retransmission by the data distribution management device on the receiving side are performed. The process for retransmission by the data distribution management device on the receiving side is a data distribution management device close to the destination, that is, a data segment received via a line with a long delay is transferred to a destination via a line with a small delay. In the data distribution management device, the data to be transferred is temporarily stored, and it is determined whether or not to retransmit the data. If it is determined that retransmission is necessary, the buffered data is retransmitted. Thus, retransmission via a line with a long delay can be avoided, and congestion on a line with a long delay can be reduced, and the retransmission time can be shortened.

In FIG. 9, when it is determined that retransmission by the data distribution management device on the receiving side is to be used (step S8).
5, YES), tmpACK use determination processing is performed, and tm
It is determined whether or not to use the pACK, and the tmpACK use flag is set to “ON” or “OFF” (step S90).
Based on the value of the mpACK use flag, it is determined whether to perform the tmpACK use process. Details of the tmpACK use determination processing in step S91 will be described later.

Thereafter, when it is determined that tmpACK is to be used (step S91, YES), tmACK shown in FIG.
A pACK utilization process is performed (step S92). afterwards,
Double retransmission avoidance processing is performed (step S93), and this processing ends. The double retransmission avoidance process is a process of setting the retransmission flag in the data distribution management device on the receiving side of the entry relating to the added data segment to “retransmitted”.

On the other hand, in step S91, tmpAC
When it is determined that K is not used (step S91, N
O), the data segment is transferred to the destination via the line with a small transmission delay (step S89), and this processing ends.

On the other hand, if it is determined that the destination reception buffer is not sufficient (step S84, NO), the transfer data is stored in the reception buffer 7 (step S86), and based on the destination window information, the reception buffer is used. Until it is confirmed that the data has been recovered sufficiently, the transfer is interrupted, the window size information of the destination is obtained by referring to the window field of the TCP header of the data segment from the destination, recorded in the distribution management table 1, and received from the window information. The transfer is temporarily stopped until it is confirmed that the buffer has been sufficiently recovered, thereby adjusting the transfer speed (step S8).
7). Thereafter, based on the adjustment of the transfer speed, data transfer to the destination is performed via a line with a small transmission delay (step S89), and this processing ends.

On the other hand, in step S91, tmpA
When it is determined that CK is not used (step S91, N
O), the same double retransmission avoidance processing as in step S93 is performed (step S94), and then, as in step S86, the transfer data is buffered (step S95). Then, data transfer to the destination is performed (step S89), and this processing ends.

On the other hand, if it is an ACK segment (step S81, YES), reception confirmation processing is performed (step S96). In this reception confirmation processing, it is determined whether or not the received data segment is a managed communication and whether or not the received data segment is a delivery acknowledgment response from the destination, that is, whether or not the received data segment is a communication entered in the distribution management table 1. If the response is a delivery confirmation response from the destination, the received data segment is stored in the tmpACK buffer 4, and the delivery confirmation processing by the SG delivery management unit 16 is notified that the delivery confirmation response has been received from the destination. Raise an event.

Then, referring to the distribution management table 1, t
Depending on the transmission status of mpACK, that is, whether or not ACK has been transmitted, whether or not to transmit ACK, and whether or not data is included in ACK
It is determined whether Piggyback has been performed (step S9).
7), if the tmpACK has been transmitted and the data has not been piggybacked (step S97, NO), this processing is terminated; otherwise, the processing shifts to step S84 to perform the processing described above.

Next, the procedure of the tmpACK use determination process in step S90 will be described with reference to the flowchart shown in FIG. In FIG. 10, first, referring to the code bits of the header part of the received segment,
It is determined whether or not it is a data segment at the time of starting communication (step S101).

If the segment is a communication start segment (step S101, YES), referring to the distribution management table 1,
It is determined whether the communication start procedure is correct (step S102). Whether or not the communication start procedure is correct is determined, for example, by referring to the distribution management table 1 and the TCP header of the received data segment, and determining whether the SYN packet is not registered in the distribution management table 1 or the TC.
The determination is made based on whether or not a data segment according to the procedure of the three handshake method P has been received from the transmission source and the destination.

If it is determined in step S102 that the communication start procedure is correct (step S102, YE
S), an entry relating to the data segment is added to the distribution management table 1 (step S103), and then tm
Set the pACK available flag to “OFF” (step S
104), end this processing. On the other hand, if the procedure is not a correct communication start procedure (step S102, NO), the tmpACK available flag is set to “OFF”, and the process ends.

On the other hand, in step S101, if the segment is not the communication start segment (step S101, NO),
The received data segment is stored in the delivery management table 1,
It is determined whether the communication is already registered (step S
105). This determination is based on the source IP in the IP header and the T
When the combination of the source port and the combination of the destination IP and the destination port in the CP header all use the same communication as the same management unit and all the same communication exist, it is determined that the communication is a registered communication. I do. Step S1
If the communication is not registered on the distribution management table 1 in step 05 (step S105, NO), tm
Set the pACK available flag to “OFF” (step S
104), end this processing.

On the other hand, when it is determined that the communication is registered on the distribution management table 1 (step S105, YE
S), it is determined whether or not the received data segment is a data segment in the destination reception window (step S106). If the segment is within the destination reception window (step S106, YES), F
The IN flag is checked to determine whether the packet is the last packet, that is, the communication end packet (step S10).
7).

If the packet is a communication end packet (step S
107, YES), the entry of the received segment is registered, and the entry of the data segment in the same communication is t
If the mpACK is available and the tmpACK has not been transmitted, the tmpACK cannot be used, the tmpACK flag of the data distribution management device is set to “OFF”,
The FIN reception completion flag is set to "ON" (step S10).
8), end this processing.

On the other hand, if it is not the communication end segment (step S107, NO), it is determined whether or not it is a window probe (step S109). If it is a window probe (step S109, YES), tmpA
The CK available flag is set to “OFF” (step S11
0), this process ends.

On the other hand, if it is not the window probe (step S109, NO), the information is registered in the distribution management table 1, the tmpACK available flag is set to "ON" (step S111), and this processing ends. In addition,
The data segment in which the tmpACK available flag is set to “ON” is stored in the transmission buffer. This step S
When the process of step 111 is performed, the information at the time of arrival of the latest data segment is tmpA
Information on whether or not CK is available is set. by this,
For example, at the time of a slow start, fine control according to the window size state, such as not performing tmpACK use control, can be performed.

In the second embodiment, in addition to the first embodiment, when the window size of the destination is sufficient, the data segment is transferred to the destination if necessary, and the temporary delivery confirmation is made as necessary. Create and send a response,
In addition, temporarily store the data segment targeted for the provisional delivery acknowledgment, and if a delivery acknowledgment from the destination cannot be received within a certain period of time, resend the data from the data distribution management device. Prevents the window size of the source from being reduced, guarantees the reliability mechanism of the TCP, and temporarily creates a data acknowledgment and temporarily transmits the data segment even if the transmission to the source is not performed. If the data delivery management device does not receive the delivery acknowledgment from the destination within a certain period, the data distribution management device performs retransmission. Retransmissions can be avoided, the congestion of the line with a large delay can be reduced, and all data can be reliably transferred without inconsistency with the reception confirmation at the destination. Suppressing congestion between the source or destination and delivery management apparatus, it is possible to highly reliable and high-speed communication.

Embodiment 3 Next, a third embodiment of the present invention will be described. In the third embodiment, the configuration of the first and second embodiments is different from the first and second embodiments in that it is determined whether or not to perform high-speed communication on a received segment. And a charge processing unit 30 that performs high-speed communication and charges the user when the user requests high-speed.

FIG. 11 is a block diagram showing a configuration of a data distribution management system according to the third embodiment of the present invention. In FIG. 11, data distribution management devices 10, 20
Has a charging unit 30. Other configurations are the same as those of the data distribution management system shown in the first embodiment.
The same components are denoted by the same reference numerals.

Here, the data distribution processing procedure of the data distribution management devices 10 and 20 will be described with reference to the flowchart shown in FIG. In FIG. 12, the data distribution management apparatuses 10 and 20 first determine whether or not the communication is not the communication registered as the non-speed-up communication and the communication of the protocol to be speeded up with reference to the protocol management table 5 (see FIG. 12). Step S121). If the data is to be speeded up (step S121, YES), the charging unit 3
0 indicates to the user that the data is data to be used for high-speed use and a fee associated with the high-speed use (step S12).
2).

Thereafter, the user inputs a result of determining whether or not to speed up, and the result is transmitted to the data distribution management device 10,
20 and the data distribution management devices 10 and 20 accept the notification (step S123). Further, it is determined whether or not the notification from the user is to use the high speed (step S124).

In the case of communication using high-speed communication (step S124, YES), the communication is received from a line with a long delay,
It is determined whether the data is to be transferred to a line with a small delay (step S125). If the data is received from a line with a long delay and is to be transferred to a line with a small delay (step S125, YES), similar to step S12,
Perform packet processing from the delay line (step S12
6), end this processing.

On the other hand, when the data is not data to be received from a line with a long delay and transferred to a line with a small delay (step S
125, NO), as in step S13, tmpAC
The K use determining unit 12 checks the data segment, and according to the check result, the data distribution management device 1
The tmpACK use control flags “ON” and “OFF” are determined for the reception segments of 0 and 20, and the tmpACK use control flags “ON” and “O” are determined as necessary.
The information of the reception segment including the "FF" is registered in the distribution management table 1 (step S127).

After that, according to the value of the tmpACK use control flag, it is determined whether or not to perform tmpACK use control (step S128). If tmpACK is used (step S128, YES), tmpACK use control is performed as in step S15 (step S12).
9), end this processing. On the other hand, if tmpACK is not used (step S128, NO), the data segment is transferred to the destination (step S140), and then the process ends.

On the other hand, when the speed-up use is not performed (step S124, NO) and when the data is not the speed-up use data (step S121, NO), the communication which does not perform the speed-up is held in the charging unit 30 and registered. (Step S130). That is, information that can uniquely identify each connection is acquired from the header information of the data segment, held in the accounting unit 30, and registered. afterwards,
This data segment is transferred to the destination (step S14)
0), this process ends.

Here, a specific data transfer process will be described with reference to FIG. First, when performing data transfer from the terminal device C1 to the terminal device C2, upon receiving data from the terminal device C1, the data distribution management device 10 presents to the user whether or not to speed up, and prompts the user. Accept the judgment result. Here, when the user selects high-speed transmission, a temporary delivery confirmation response is sent to the terminal device C1, and data is transferred to the data distribution management device 20. The data distribution management device 20 has a retransmission processing function as a data distribution management device on the receiving side, and when receiving this data, the data distribution management device 20 holds this data segment, sets a retransmission timer,
Transfer to terminal device C2. At this time, if the delivery confirmation response from the terminal device C2 is not received before the retransmission timeout, the data delivery management device 20 sets a retransmission completion flag and retransmits the held data to the terminal device C2. .

When data is transferred from the terminal device C2 to the terminal device C1, the data distribution management device 20
Receives the data from the terminal device C2, requests the user to determine whether or not to speed up, and if the user selects speeding up, sends a temporary delivery confirmation response to the terminal device C2 and The data is transferred to the distribution management device 10. In this case, the data distribution management device 10 has a retransmission processing function as a data distribution management device on the receiving side, and when the data distribution management device 10 receives this data,
The data segment is held, a retransmission timer is set, and this data is transferred to the terminal device C1. At this time,
If the data delivery management device 10 does not receive the delivery acknowledgment from the terminal device C1 before the retransmission timeout, the data delivery management device 10 sets a retransmission completion flag and retransmits the held data to the terminal device C1.

In this manner, by combining the two data distribution management devices 10 and 20, the reliability of communication is ensured and the data on the receiving side is prevented while preventing the phenomenon of throughput due to the reduction of the window size of the transmission source. By using the retransmission function in the distribution management device, it becomes possible to prevent congestion on the delay line, and
Can support efficient business.

[0128]

As described above, according to the present invention, the data transmitted from the first terminal device is temporarily stored in the reception buffer, and the transfer control means includes the reception window size holding means. Is controlled to adjust the transfer rate of the data temporarily stored in the reception buffer according to the reception window size of the second terminal device held by the reception buffer of the second terminal device. Does not overflow, and the number of retransmissions is reduced, so that data can be transferred reliably and quickly.

[0129] According to the next invention, the window size acquiring means is provided for each of the first terminal device and the second terminal device for each connection between the first terminal device and the second terminal device.
The window size information of the terminal device is obtained, the management unit holds and manages the window size information for each connection, and the transfer control unit corresponds to the window size managed by the management unit. Since the control for adjusting the transfer rate of the data stored in the reception buffer is performed for each connection, dynamic data transfer control is performed for each connection, and the reception buffer of the second terminal device overflows. Therefore, there is an effect that data can be transferred reliably and quickly because retransmission is reduced.

According to the next invention, the first judging means:
When receiving data to be transmitted to the first terminal device from the second terminal device, a tentative acknowledgment is created and it is determined whether or not to transmit to the second terminal device. The buffer temporarily stores the data determined by the first determination means to create and transmit the temporary delivery acknowledgment, and the second determination means determines that the first terminal device Determining whether the reception of the data transmitted from the terminal device has failed, and the first transfer control unit determines that the first determining unit creates and transmits the provisional acknowledgment response The data transmitted from the second terminal device is transferred to the first terminal device side, the data is stored in the transmission buffer, and the second determination unit fails to receive the data. When it is determined that the Performs retransmission processing of data. Further, a reception buffer temporarily stores data transmitted from the first terminal device, a reception window size holding unit holds a reception window size of the second terminal device, and a second transfer unit. Controls the transfer rate of data temporarily stored in the reception buffer in accordance with the reception window size, so that the transfer rate of data transmitted from the second terminal device is increased. ,
Since the reception buffer of the second terminal device does not overflow and the number of retransmissions is reduced, there is an effect that data can be transferred reliably and quickly.

According to the next invention, the first judging means:
When receiving data to be transmitted to the first terminal device from the second terminal device, a tentative acknowledgment is created and it is determined whether or not to transmit to the second terminal device. The buffer temporarily stores the data determined by the first determination means to create and transmit the temporary delivery acknowledgment, and the second determination means determines that the first terminal device Determining whether the reception of the data transmitted from the terminal device has failed, and the first transfer control unit determines that the first determining unit creates and transmits the provisional acknowledgment response The data transmitted from the second terminal device is transferred to the first terminal device side, the data is stored in the transmission buffer, and the second determination unit fails to receive the data. When it is determined that the Performs retransmission processing of data. A window size acquiring unit acquires window size information of the first terminal device and the second terminal device for each connection between the first terminal device and the second terminal device; The management means holds and manages information on the window size for each connection acquired by the window size acquisition means, and the second transfer control means:
Since the control for adjusting the data transfer rate for each connection is performed in accordance with the window size managed by the management means, while increasing the transfer rate of data transmitted from the second terminal device, Since the reception buffer of the second terminal device does not overflow and the number of retransmissions is reduced, there is an effect that data can be transferred reliably and quickly.

According to the next invention, the third determining means is:
The second terminal device determines whether or not reception of the data transmitted from the first terminal device has failed, and a retransmission control unit determines that the third determination unit determines that reception of the data transmitted from the first terminal device has failed. If we determine that we failed to receive the transmitted data,
Since the data stored in the reception buffer is retransmitted, bidirectional communication can be performed reliably and quickly without congesting a transmission line with a large transmission delay.

According to the next invention, when the retransmission control means performs the retransmission processing of the data, the retransmission control means performs the retransmission processing of the data and creates a provisional acknowledgment response to the data to generate the first transmission confirmation response. Since transmission is performed to the terminal device, there is an effect that high-speed and large-capacity communication can be realized.

According to the next invention, the fourth judging means:
Holding information indicating whether or not retransmission processing has been performed on the data transmitted from the first terminal device, determining whether or not the data has been retransmitted based on the information; When the control means performs retransmission processing of the data stored in the reception buffer in response to the failure of the reception, when the fourth determination means determines that retransmission has been completed, the control means causes the data to be retransmitted. Since no control is performed, the double retransmission processing is reliably avoided, and an effect is obtained that higher-speed data transfer can be performed.

According to the next invention, the high-speed transfer determining means determines whether or not the transmitted / received data should be transferred at a high speed, and the charging means determines whether or not the high-speed transfer determining means transmits the transmitted / received data at a high speed. If it is determined that the data should be transferred to the first terminal device or the user of the second terminal device, the charge associated with the speeding-up is performed. This makes it possible to reliably perform a flexible billing process according to the characteristics, and to develop an efficient business.

According to the next invention, when the input requesting means determines that the data to be transmitted / received should be transferred at a high speed, the input request means transmits the billing content accompanying the speeding-up. Presenting information to the original first terminal device or the second terminal device and inputting information as to whether or not to speed up the user of the first terminal device or the second terminal device Request, and the charging means, when the input request means receives a notification that speeding up is performed,
Since the accounting process is performed in accordance with the high-speed transfer of the transmitted / received data, it is possible to construct a flexible system reflecting the user's intention.

According to the next invention, the data distribution management device according to any one of the above inventions is a transmission path between the first terminal device and the second terminal device, Since the first terminal device or the second terminal device is disposed at an end of a transmission line having a large transmission delay as compared with a transmission line connecting the second terminal device, bidirectional communication is realized. Even when there is a transmission path with a large transmission delay, there is an effect that reliable and high-speed two-way communication can be realized.

According to the next invention, a transmission line having a larger transmission delay than a transmission line connecting the first terminal device or the second terminal device is realized as a satellite line. Even when a satellite line with a large delay is used, there is an effect that reliable and high-speed two-way communication can be specifically realized.

According to the next invention, the reception window size of the second terminal device is held in the reception window size holding step, and the data transmitted from the first terminal device is temporarily stored in the reception buffer step. And the transfer control step controls the transfer rate of the data temporarily stored in the reception buffer in accordance with the reception window size.
Since the receiving buffer of the terminal device does not overflow and the number of retransmissions is reduced, there is an effect that data can be transferred reliably and quickly.

According to the next invention, the window size process is performed for each connection between the first terminal device and the second terminal device by the window size process. The size information is acquired, the management step holds and manages the window size information for each connection acquired by the window size acquisition step, and is transmitted from the first terminal device by the reception buffer step. And temporarily controlling the transfer rate of the data stored by the reception buffer step for each connection according to the window size managed by the management step by the transfer control step. As a result, the reception buffer of the second terminal device does not overflow and retransmission is reduced. It made for an effect that it is possible to transfer data reliably and quickly.

According to the next invention, when data to be transmitted from the second terminal device to the first terminal device is received in the first determination step, a temporary confirmation response is created and Determining whether or not to transmit to the second terminal device, and temporarily storing data determined by the first determining step to create and transmit the temporary delivery acknowledgment by the transmission buffering step; The first terminal device determines whether or not the reception of the data transmitted from the second terminal device has failed by the determining step of 2; When the step determines that the provisional acknowledgment is created and transmitted, the data transmitted from the second terminal is transferred to the first terminal, and the data is stored in the transmission buffer. Accumulate the second judgment Degree is when it is determined to have failed to receive the said data, performs retransmission processing of the data accumulated in the transmission buffer. Also, by the receiving buffer process,
The data transmitted from the first terminal device is temporarily stored, the receiving window size of the second terminal device is held by a receiving window size holding step, and the receiving window size is stored by a second transfer control step. Since the control for adjusting the transfer rate of the data temporarily stored in the reception buffer according to the size is performed, while increasing the transfer rate of the data transmitted from the second terminal device,
Since the reception buffer of the second terminal device does not overflow and the number of retransmissions is reduced, there is an effect that data can be transferred reliably and quickly.

According to the next invention, in the first judging step, when the data to be transmitted from the second terminal device to the first terminal device is received, a temporary delivery confirmation response is created. Determining whether or not to transmit to the second terminal device, and temporarily accumulating data determined by the first determining step to create and transmit the temporary delivery acknowledgment by the transmission buffering step; In the second determining step, the first terminal device determines whether or not the reception of the data transmitted from the second terminal device has failed. If the determining step determines that the temporary delivery confirmation response is created and transmitted, the second
Transferring the data transmitted from the terminal device to the first terminal device side, storing the data in the transmission buffer, and determining that the reception of the data has failed in the second determination step. And resends the data stored in the transmission buffer. Also. A window size acquiring step of acquiring window size information of the first terminal device and the second terminal device for each connection between the first terminal device and the second terminal device; And holds and manages the information on the window size for each connection obtained in the window size obtaining step, and each connection corresponding to the window size managed by the management step is performed by the second transfer control step. Since the control for adjusting the data transfer rate is performed every time, the transfer rate of the data transmitted from the second terminal device is increased, and the reception buffer of the second terminal device does not overflow, and Since retransmission is reduced, there is an effect that data can be transferred reliably and quickly.

According to the next invention, in the third determining step, the second terminal device determines whether or not reception of data transmitted from the first terminal device has failed, and performs retransmission control. When the third determination step determines that the reception of the data transmitted from the first terminal device has failed in the step, the data stored in the reception buffer is retransmitted. In addition, there is an effect that bidirectional communication can be performed reliably and quickly without congesting a transmission line having a large transmission delay.

According to the next invention, when the retransmission control step performs the data retransmission processing, the data retransmission processing is performed, and a temporary delivery acknowledgment for the data is generated to generate the first transmission confirmation response. Since transmission is performed to the terminal device, there is an effect that high-speed and large-capacity communication can be realized.

According to the next invention, in the fourth judging step, information is held as to whether or not the data transmitted from the first terminal device has been retransmitted, and the information is determined based on the information. It is determined whether or not the data has been retransmitted, and if the retransmission control step performs retransmission processing of the data stored in the reception buffer in response to the reception failure, the fourth determination step Is determined not to perform retransmission processing of the data when it is determined that retransmission has been completed, so that double retransmission processing is reliably avoided, and an effect is obtained that higher-speed data transfer can be performed.

According to the next invention, it is determined whether or not the transmitted / received data is to be transferred at a high speed in the high-speed transfer determining step, and the high-speed transfer determining step determines whether the transmitted / received data is high-speed in the charging step. If it is determined that the data should be transferred to the first terminal device or the user of the second terminal device, the charge associated with the speeding-up is performed. This makes it possible to reliably perform a flexible billing process according to the characteristics, and to develop an efficient business.

According to the next invention, when the high-speed transfer determining step determines in the input requesting step that the transmitted / received data should be transferred at a high speed, the billing content accompanying the high-speed transmission is transmitted. Presenting information to the original first terminal device or the second terminal device and inputting information as to whether or not to speed up the user of the first terminal device or the second terminal device Request, and the charging process
When the input requesting process receives a notification that speeding up is performed, a billing process accompanying the high-speed transfer of the transmitted / received data is performed, so that a flexible system reflecting a user's intention is constructed. It has the effect that it can be done.

A program according to the next invention is a program for causing a computer to execute the method described in any one of the claims, and the program becomes machine-readable, whereby the program according to any one of the claims can be read. There is an effect that the operation can be executed by a computer.

[Brief description of the drawings]

FIG. 1 is a block diagram illustrating a configuration of a data distribution management system including a data distribution management device according to a first embodiment of the present invention.

FIG. 2 is a flowchart illustrating a data distribution management processing procedure performed by the data distribution management device illustrated in FIG. 1;

FIG. 3 is a detailed flowchart showing a procedure for processing a packet from a delay line shown in FIG. 2;

FIG. 4 is a diagram showing an example of the contents of a route management table shown in FIG. 1;

FIG. 5 is a diagram showing an example of the contents of a route management table shown in FIG. 1;

FIG. 6 is a detailed flowchart showing a processing procedure of a tmpACK use candidate packet shown in FIG. 2;

FIG. 7 is a flowchart showing a procedure of a reception confirmation process and a retransmission process shown in FIGS. 3 and 6;

FIG. 8 is a detailed flowchart showing a tmpACK use control processing procedure shown in FIG. 1;

FIG. 9 is a detailed flowchart showing a procedure of processing a packet from a delay line by the data distribution management device according to the second embodiment of the present invention.

FIG. 10 is a detailed flowchart showing a tmpACK use control processing procedure by the data distribution management device according to the second embodiment of the present invention.

FIG. 11 is a block diagram showing a configuration of a data distribution management system including a data distribution management device according to a third embodiment of the present invention.

12 is a flowchart illustrating a data distribution management process performed by the data distribution management device illustrated in FIG. 11;

FIG. 13 is a block diagram showing a configuration of a data distribution management system including a conventional data distribution management device.

[Explanation of symbols]

1 Delivery management table, 2a, 2b, 3 lines, 4t
mpACK buffer, 5 protocol management table, 6
Transmission buffer, 7 reception buffer, 10, 20 data distribution management device, 10a gateway function unit, 11,
17 communication unit, 12 tmpACK use determination unit, 13
tmpACK creating unit, 14 SGTimer counting unit, 15 distribution data recording unit, 16 SG distribution management unit,
C1, C2 terminal device, 30 billing processing unit.

Claims (21)

[Claims] 1. A transmission line arranged on a transmission line between a first terminal device and a second terminal device, wherein a transmission line connecting the second terminal device side connects the first terminal device side. A data distribution management device having a transmission delay smaller than a transmission delay of a path and transferring at least data transmitted from the first terminal device to the second terminal device, wherein the first terminal device A receiving buffer for temporarily storing data transmitted from the receiving terminal; a receiving window size holding unit for holding a receiving window size of the second terminal device; and a receiving buffer temporarily stored in the receiving buffer corresponding to the receiving window size. Transfer control means for controlling a transfer rate of the transferred data, and a data distribution management device. 2. A transmission line arranged on a transmission line between a first terminal device and a second terminal device, wherein a transmission line connecting the second terminal device side connects the first terminal device side. A data distribution management device having a transmission delay smaller than a transmission delay of a path and performing transfer control of data transmitted and received between the first terminal device and the second terminal device; A reception buffer for temporarily storing data transmitted from the first terminal device; and a first terminal device and a second terminal for each connection between the first terminal device and the second terminal device. A window size obtaining unit that obtains information on a window size of the device; a management unit that holds and manages information on a window size for each connection obtained by the window size obtaining unit; Corresponding sense is the window size for each connection, the data distribution management device being characterized in that and a transfer control means for performing control for adjusting the transfer rate of data stored in the receive buffer. 3. A transmission line arranged on a transmission line between a first terminal device and a second terminal device, wherein a transmission line connecting the second terminal device side connects the first terminal device side. A data delivery management device having a transmission delay smaller than a transmission delay of a path and performing transfer control of data transmitted and received between the first terminal device and the second terminal device; A first acknowledgment is created when data to be transmitted to the first terminal is received from the first terminal, and whether or not to transmit the acknowledgment to the second terminal is determined.
A transmission buffer for temporarily accumulating data determined by the first determination means to create and transmit the temporary delivery acknowledgment; and wherein the first terminal device comprises: Second determining means for determining whether reception of data transmitted from the device has failed; and when the first determining means determines to create and transmit the temporary delivery confirmation response, the second determining means The second terminal device transfers the data transmitted from the second terminal device to the first terminal device side, and stores the data in the transmission buffer.
First transfer control means for performing retransmission processing of the data stored in the transmission buffer when the determination means determines that reception of the data has failed; and data transmitted from the first terminal device. Buffer for temporarily storing the reception window size, reception window size holding means for holding the reception window size of the second terminal device, and transfer rate of data temporarily stored in the reception buffer corresponding to the reception window size. And a second transfer control means for controlling the adjustment of the data distribution management device. 4. A transmission line arranged on a transmission line between a first terminal device and a second terminal device, wherein a transmission line connecting the second terminal device side connects the first terminal device side. A data delivery management device having a transmission delay smaller than a transmission delay of a path and performing transfer control of data transmitted and received between the first terminal device and the second terminal device; A first acknowledgment is created when data to be transmitted to the first terminal is received from the first terminal, and whether or not to transmit the acknowledgment to the second terminal is determined.
A transmission buffer for temporarily accumulating data determined by the first determination means to create and transmit the temporary delivery acknowledgment; and wherein the first terminal device comprises: Second determining means for determining whether reception of data transmitted from the device has failed; and when the first determining means determines to create and transmit the temporary delivery confirmation response, the second determining means The second terminal device transfers the data transmitted from the second terminal device to the first terminal device, stores the data in the transmission buffer,
The first transfer control means for retransmitting the data stored in the transmission buffer when the determination means determines that the reception of the data has failed, the first terminal device and the second Window size obtaining means for obtaining window size information of the first terminal device and the second terminal device for each connection with the terminal device; and a window for each connection obtained by the window size obtaining device. Management means for holding and managing size information; and second transfer control means for controlling a data transfer rate for each connection in accordance with a window size managed by the management means. A data distribution management device. 5. The third terminal according to claim 3, wherein the second terminal determines whether reception of the data transmitted from the first terminal has failed. And retransmission control means for retransmitting the data stored in the reception buffer when it is determined that the reception of the data transmitted from the first terminal device has failed. 5. The data distribution management device according to any one of items 4 to 4. 6. The retransmission control means, when performing the data retransmission processing, performs the data retransmission processing, creates a provisional acknowledgment response to the data, and transmits it to the first terminal device. The data distribution management device according to claim 3, wherein: 7. Retaining information as to whether retransmission processing has been performed on data transmitted from the first terminal device,
The information processing apparatus further includes a fourth determination unit configured to determine whether the data has been retransmitted based on the information, wherein the retransmission control unit is configured to transmit the data stored in the reception buffer in response to the reception failure. 7. The data distribution management according to claim 3, wherein when performing the retransmission processing, when the fourth determination unit determines that retransmission has been completed, control is performed to prevent the data from being retransmitted. apparatus. 8. A high-speed transfer determining means for determining whether or not the transmitted / received data is to be transferred at a high speed, and when the high-speed transfer determining means determines that the transmitted / received data should be transferred at a high speed. , The charge associated with the speeding-up is sent to the first terminal device or the second
The data distribution management device according to any one of claims 3 to 7, further comprising: charging means for charging a user of the terminal device. 9. The billing means, when the high-speed transfer determining means determines that the transmitted / received data should be transferred at high speed, the billing content associated with the speeding-up to the first transmission source. Request to present to the first terminal device or the second terminal device and request the user of the first terminal device or the second terminal device to input information as to whether or not to speed up. 9. The method according to claim 8, wherein the charging unit performs a charging process associated with the high-speed transfer of the transmitted / received data when the input requesting unit receives a notification that speeding up is performed. A data management device according to claim 1. 10. The data distribution management device according to claim 1, wherein the data distribution management device is a transmission path between the first terminal device and the second terminal device, Terminal device or the second
A data distribution management system, which is disposed at an end of a transmission line having a transmission delay greater than a transmission line connecting the terminal device. 11. The first terminal device or the second terminal device.
11. The data distribution management system according to claim 10, wherein the transmission line having a larger transmission delay than the transmission line connecting the terminal device is a satellite line. 12. A transmission line arranged on a transmission line between a first terminal device and a second terminal device, wherein a transmission line connecting the second terminal device side connects the first terminal device side. A data delivery management method having a transmission delay smaller than a transmission delay of a path and transferring at least data transmitted from the first terminal device to the second terminal device side, wherein the second terminal device A receiving window size holding step of holding the receiving window size of the above, a receiving buffer step of temporarily storing data transmitted from the first terminal device, and a temporary storing of the receiving buffer corresponding to the receiving window size. A transfer control step of performing control to adjust the transfer rate of the data. 13. A transmission line arranged on a transmission line between a first terminal device and a second terminal device, wherein a transmission line connecting the second terminal device side connects the first terminal device side. A data delivery management method having a transmission delay smaller than a transmission delay of a path and performing transfer control of data transmitted and received between the first terminal device and the second terminal device; A window size obtaining step of obtaining information on window sizes of the first terminal device and the second terminal device for each connection between the terminal device and the second terminal device; A management step of holding and managing the acquired window size information for each connection; a reception buffer step of temporarily storing data transmitted from the first terminal device; A transfer control step of controlling, for each connection, a transfer rate of the data stored by the reception buffer step for each connection corresponding to the window size managed by the data transmission management method. . 14. A transmission line arranged on a transmission line between a first terminal device and a second terminal device, wherein a transmission line connecting the second terminal device side connects the first terminal device side. A data distribution management method having a transmission delay smaller than a transmission delay of a path and performing transfer control of data transmitted and received between the first terminal device and the second terminal device; A first determining step of generating a temporary confirmation response when receiving data to be transmitted to the first terminal device from the terminal device and determining whether to transmit the data to the second terminal device; A transmission buffering step of temporarily storing data determined to be created and transmitted by the first determining step to create and transmit the temporary delivery acknowledgment, wherein the first terminal device transmits from the second terminal device A second method for determining whether the reception of the received data has failed A determination step, and when the first determination step determines that the provisional acknowledgment is to be created and transmitted, the data transmitted from the second terminal apparatus is transferred to the first terminal apparatus side. And storing the data in the transmission buffer,
A first transfer control step of performing retransmission processing of the data stored in the transmission buffer when the determination step determines that the reception of the data has failed; and data transmitted from the first terminal device. A receiving buffer step of temporarily storing the reception window size of the second terminal device; and a transfer of data temporarily stored in the reception buffer corresponding to the reception window size. A second transfer control step of performing a control for adjusting the speed; and a data transfer management method. 15. A transmission line arranged on a transmission line between a first terminal device and a second terminal device, wherein a transmission line connecting the second terminal device side connects the first terminal device side. A data distribution management method having a transmission delay smaller than a transmission delay of a path and performing transfer control of data transmitted and received between the first terminal device and the second terminal device; A first acknowledgment is created when data to be transmitted to the first terminal is received from the first terminal, and whether or not to transmit the acknowledgment to the second terminal is determined.
A transmission buffering step of temporarily storing data determined to be created and transmitted by the first determination step in the provisional delivery acknowledgment; A second determining step of determining whether reception of the data transmitted from the terminal device has failed; and, if the first determining step determines that the provisional acknowledgment is created and transmitted, the The data transmitted from the second terminal device is transferred to the first terminal device, and the data is stored in the transmission buffer.
A first transfer control step of performing a retransmission process of the data stored in the transmission buffer when the determination step determines that the reception of the data has failed; and the first terminal device and the second A window size obtaining step of obtaining window size information of the first terminal device and the second terminal device for each connection with a terminal device; and a window for each connection obtained by the window size obtaining step. A management step of holding and managing the size information; and a second transfer control step of performing control to adjust a data transfer rate for each connection in accordance with the window size managed by the management step. A data distribution management method characterized in that: 16. A third determining step in which the second terminal device determines whether reception of data transmitted from the first terminal device has failed, and the third determining step includes: 13. A retransmission control step of performing retransmission processing of data accumulated in the reception buffer when it is determined that reception of data transmitted from the first terminal device has failed. 15. The data distribution management method according to any one of 15. 17. The retransmission control step, in the case of performing the data retransmission processing, performs the data retransmission processing, creates a provisional acknowledgment response to the data, and transmits the acknowledgment to the first terminal apparatus. 17. The data distribution management method according to claim 16, wherein: 18. Retaining information on whether or not retransmission processing has been performed on data transmitted from the first terminal device, and determining whether or not the data has been retransmitted based on the information. The method further includes a fourth determining step of determining, wherein the retransmission control step includes a step of retransmitting the data stored in the reception buffer in response to the failure of the reception. 17. The method according to claim 16, wherein when it is determined, control is performed to prevent the data from being retransmitted.
8. The data distribution management method according to 7. 19. A high-speed transfer determining step of determining whether or not the transmitted / received data should be transferred at a high speed, and a case where the high-speed transfer determining step determines that the transmitted / received data should be transferred at a high speed. , The charge associated with the speeding-up is sent to the first terminal device or the second
The data distribution management method according to any one of claims 16 to 18, further comprising: charging a user of the terminal device. 20. The charging step, wherein when the high-speed transfer determining step determines that the transmitted / received data should be transferred at a high speed, the charging content associated with the speeding-up is transmitted to the first transmission source. Request to present to the first terminal device or the second terminal device and request the user of the first terminal device or the second terminal device to input information as to whether or not to speed up. 19. The method according to claim 18, further comprising the step of: performing, when the input requesting step receives a notification that speeding-up is performed, performing a charging process associated with high-speed transfer of the transmitted / received data. Data management method described in. A program for causing a computer to execute the method according to any one of claims 12 to 20.