JP2018067788A - Inbound traffic acceleration device, acceleration method, and acceleration program - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide inbound traffic acceleration device, acceleration method and acceleration program for accelerating so that the transport protocol of a data transmission device can use up an available band as quickly as possible, while suppressing reply of unnecessary acknowledgement packet.SOLUTION: An inbound traffic acceleration device is a data receiving device 1 for replying a response packet to a data packet received from a data transmission device 2, and includes target transmission speed estimation means 12 for estimating the available band of a network based on the reception results of the data packet, and estimating the target transmission speed based on the estimated available band, current transmission speed estimation means 13 for estimating the current transmission speed at which the data transmission device transmits the data packet, on the basis of the reception results of data packet, and response transmission frequency determination means 15 for determining the transmission frequency of the response packet so that the current transmission speed approaches the target transmission speed, on the basis of the estimated target transmission speed, and the estimated current transmission speed.SELECTED DRAWING: Figure 2

Description

  The present invention relates to an apparatus for speeding up received traffic, a speed-up method, and a speed-up program, and more particularly to reply control for an acknowledgment packet.

  In recent years, with the spread of high-performance, high-performance mobile terminals such as smartphones and tablet terminals, photographs and short videos are taken with mobile terminals and posted to SNS (Social Networking Service) and IM (Instant Messaging) services. Usage scenes of uploading content from user terminals to a server or storage on a network, such as saving to a cloud storage, are increasing.

  Here, TCP (Transmission Control Protocol), which is a transport protocol used in many current data communications, transmits data while searching for available line performance (available bandwidth) by congestion control. There is an inconvenience that it takes time to use up the performance. The specific behavior of TCP congestion control is as follows. In congestion control, the transmission mode is the slow start phase immediately after the start of communication or timeout, and transmission is possible each time an acknowledgment (ACK: ACKnowledgement) packet indicating that the data packet has successfully reached the data receiver is received. Increase the amount of data (cwnd: congestion window) by one packet. In addition, after a slight congestion is detected, the transmission form is a congestion avoidance phase.

  The method of increasing / decreasing cwnd in the congestion avoidance phase differs for each congestion control. For example, in TCP NewReno of Non-Patent Document 1, every time an ACK packet is received by the same number of packets as cwnd, cwnd is increased by one packet. As described above, the TCP congestion control operates by gradually increasing the amount of data to be transmitted while confirming that the data packet has been transmitted normally by using the ACK packet. The larger the round trip delay required to receive a packet, the longer it takes to exhaust the network performance.

  Various efforts have been made to cope with this inconvenience. Many of these efforts are methods for improving the TCP algorithm of the data transmission apparatus, such as High Speed TCP in Non-Patent Document 2. Non-Patent Document 2 shortens the time until the network performance is used up by increasing the increase rate of cwnd in the congestion avoidance phase as compared with Non-Patent Document 1. However, in the case of content uploading or the like, the data transmission apparatus becomes a user terminal, and thus it is necessary to modify the TCP of the user terminal in order to realize these methods. Since a huge number of user terminals already exist, the above-described method that requires remodeling each of these TCPs is not realistic.

  As another approach, an improvement measure as in Patent Document 1 has been taken so far. According to Patent Document 1, the frequency of ACK to be returned is increased by sending back an ACK from the data receiving device at regular intervals regardless of whether or not a data packet is received, and the number of times TCP congestion control is performed in the data sending device. And the increase speed of cwnd is accelerated. Thereby, the traffic uploaded from the user terminal can be speeded up only by modifying the data receiving device.

Japanese Patent No. 4777996 Japanese Patent Laid-Open No. 2004-80070

S. Floyd and T. Henderson, "The New Reno Modification to TCP's Fast Recovery Algorithm," RFC 2582, Apr. 1999. S. Floyd, "HighSpeed TCP for Large Congestion Windows," RFC 3649, Dec. 2003. S. Ha, I. Rhee, and L. Xu, "CUBIC: A New TCP-Friendly High-Speed TCP Variant," In Proc. Of ACM SIGOPS, vol.42, no.5, pp.64-74, New York, NY, USA, Jul. 2008.

  However, the background art described above has the following problems.

  However, since Patent Document 1 has a constant frequency of returning an ACK from the data receiving apparatus, there is a problem that an ACK cannot be returned with an optimal frequency, resulting in excess or deficiency. Increasing the frequency of ACKs to be returned increases the TCP cwnd of the data transmission device quickly, and there is a merit that the traffic can be speeded up. On the other hand, ACK traffic increases and data traffic flowing in the same direction is increased. There is a demerit of being pressed. In the case of an ACK packet including only a header, the size is about 5% of the data packet. For example, when the frequency of returning an ACK packet is doubled, the throughput of data traffic flowing in the same direction is about 5 by simple calculation. %descend. The merit obtained by increasing the frequency of ACK varies depending on the situation. For example, in the slow start phase, immediately after the start of communication, it is possible to speed up the traffic as quickly as the ACK frequency is increased, but the TCP cwnd of the data transmission device is a value that can sufficiently use the available bandwidth. After reaching, there is no merit to increase the frequency of ACK. In the congestion avoidance phase, for example, when the TCP of the data transmission apparatus is the TCP New Reno of Non-Patent Document 1, the cwnd increases rapidly when the frequency of ACK is increased as described above. For example, when the TCP of the data transmission device is CUBIC TCP of Non-Patent Document 3, cwnd is calculated with the elapsed time, so that even if the frequency of ACK is increased, the merit is small. Since Patent Document 1 does not consider this merit and demerit, the amount of increase in ACK frequency is too small and it takes time to use up the available bandwidth, or the amount of increase in ACK frequency is too large and excessive. ACK traffic is generated, resulting in a disadvantage that the throughput of data traffic flowing in the same direction is reduced.

  Patent Document 2 relates to dynamic control of the period of confirmation response, and it has been proposed to use the available bandwidth of the network as a criterion when determining the frequency of confirmation response. However, in Patent Document 2, when the change is severe, the transmission frequency of the confirmation response is set high, and when the change is moderate, the transmission frequency of the confirmation response is set low. For this reason, the above-described problem to be solved by the present invention cannot be solved.

[Object of invention]
The present invention accelerates a transport protocol of a data transmission apparatus so that the available bandwidth can be used up quickly, and suppresses the return of unnecessary acknowledgment packets, speeding up apparatus, speeding up method, and speeding up of received traffic The purpose is to provide the program.

In order to achieve the above object, a speed-up device for received traffic according to the present invention is a speed-up device for received traffic used in a data receiving device that returns a response packet to a data packet received from a data transmitting device. ,
Target transmission speed estimation means for estimating the available bandwidth of the network based on the reception result of the data packet and estimating the target transmission speed based on the estimated available bandwidth;
Based on the reception result of the data packet, a current transmission rate estimation means for estimating a current transmission rate at which the data transmission device transmits the data packet;
Response transmission frequency determining means for determining the transmission frequency of the response packet based on the estimated target transmission rate and the estimated current transmission rate so that the current transmission rate approaches the target transmission rate.

A method for speeding up received traffic according to the present invention is a method for speeding up received traffic used in a data receiving apparatus that returns a response packet to a data packet received from a data transmitting apparatus,
Estimate the available bandwidth of the network based on the reception result of the data packet, estimate the target transmission speed based on the estimated available bandwidth,
Based on the reception result of the data packet, estimate the current transmission rate at which the data transmission device sends the data packet,
Based on the estimated target transmission rate and the estimated current transmission rate, the transmission frequency of the response packet is determined such that the current transmission rate approaches the target transmission rate.

A reception traffic acceleration program according to the present invention is a reception traffic acceleration program used in a data reception device that returns a response packet to a data packet received from a data transmission device,
On the computer,
A target transmission rate estimation process for estimating the available bandwidth of the network based on the reception result of the data packet and estimating the target transmission rate based on the estimated available bandwidth;
Based on the reception result of the data packet, a current transmission rate estimation process for estimating a current transmission rate at which the data transmission device transmits the data packet;
Based on the estimated target transmission rate and the estimated current transmission rate, a response transmission frequency determination process for determining a transmission frequency of response packets so that the current transmission rate approaches the target transmission rate is executed. .

  According to the present invention, the speed-up device for receiving traffic, the speed-up method, which accelerates the transport protocol of the data transmission device so that the available bandwidth can be used up quickly and suppresses the return of unnecessary acknowledgment packets, and A speed-up program can be provided.

It is a block diagram for demonstrating the speed-up device of the received traffic of embodiment of the high-order concept of this invention. It is a block diagram for demonstrating the speed-up apparatus of the received traffic of 1st Embodiment of this invention. It is a flowchart for demonstrating operation | movement of the speed-up apparatus of the received traffic of 1st Embodiment of this invention. It is a block diagram for demonstrating the speed-up apparatus of the received traffic of 2nd Embodiment of this invention. It is a flowchart for demonstrating operation | movement of the speed-up apparatus of the received traffic of 2nd Embodiment of this invention. (A) is a block diagram for demonstrating the speed-up device of the received traffic of other embodiment of this invention, (b) is information processing apparatus used for the speed-up device of the received traffic of other embodiment. It is a block diagram which shows an example.

  Before describing a preferred embodiment of the present invention, a speed-up device for receiving traffic and a speed-up method according to a superordinate embodiment of the present invention will be described. FIG. 1 is a block diagram for explaining an apparatus for speeding up received traffic according to an embodiment of the superordinate concept of the present invention.

  1 includes a target transmission rate estimation unit 201, a current transmission rate estimation unit 202, and a response transmission frequency determination unit 203.

  The target transmission rate estimation means 201 estimates the available bandwidth of the network based on the reception result of the data packet, and estimates the target transmission rate based on the estimated available bandwidth. The current transmission speed estimation means 202 estimates the current data packet transmission speed based on the data packet reception result. Response transmission frequency determining means 203 determines the transmission frequency of response packets. The response packet transmission frequency is determined based on, for example, one or more information of the target transmission speed estimated by the target transmission speed estimation means 12 and the current transmission speed estimated by the current transmission speed estimation means 13. .

  According to this embodiment, the available bandwidth of the network is estimated based on the reception result of the data packet, and the target transmission rate is estimated based on the estimated available bandwidth. Further, based on the reception result of the data packet, the current transmission rate of the data packet is estimated. Then, the transmission frequency of the response packet is determined based on one or more pieces of information of the estimated target transmission rate and the estimated current transmission rate. In particular, based on the estimated target transmission rate and the estimated current transmission rate, the response packet transmission frequency is determined so that the current transmission rate approaches the target transmission rate. As a result, the available bandwidth is estimated, and based on the estimation result, it is determined how fast and how fast the amount of data that can be transmitted by the transport protocol of the data transmission device increases, and the response packet reply frequency is changed. . As a result, the available bandwidth can be accelerated so that it can be used up quickly, and unnecessary reply packets can be suppressed. Hereinafter, more specific embodiments of the present invention will be described in detail with reference to the drawings.

[First Embodiment]
The speed-up device and speed-up method for received traffic according to the first embodiment of the present invention will be described. FIG. 2 is a block diagram for explaining an apparatus for speeding up received traffic according to the first embodiment of this invention. FIG. 3 is a flowchart for explaining the operation of the apparatus for speeding up received traffic according to the first embodiment of this invention.

[Description of configuration]
In this embodiment, the speed-up device and method for speeding up received traffic are applied to a data receiving device 1 that receives a data packet transmitted from the data sending device 2 via the network 4.

  The data reception device 1 and the data transmission device 2 in the system of FIG. 2 are, for example, a PC (Personal Computer) or a portable terminal when the user downloads content, or a server or cloud storage when the user uploads content Etc.

  The data receiver 1 in the system of FIG. 2 receives the data packet transmitted from the data transmitter 2 and sends a response packet to the data transmitter 2 according to whether or not the packet has been received normally or at regular intervals. It is the data receiver 1 which transmits to.

  The data transmission device 2 in the system of FIG. 2 is, for example, a server or cloud storage when the user downloads content, or a PC or portable terminal when the user uploads content, 1, when a response packet corresponding to the data packet is received from the data receiving device 1 according to the information described in the response packet, without confirming normal reception. The data transmission device 2 determines the amount of data packets that can be transmitted and transmits the data packets to the data reception device 1 according to the amount of data packets that can be transmitted.

  Further, the system of FIG. 2 includes a network 4 that connects the data receiving device 1 and the data transmitting device 2.

  Here, when the protocol used for communication between the data receiving device 1 and the data transmitting device 2 is TCP, the response packet corresponds to an ACK packet, and the amount of the transmittable data packet corresponds to cwnd. To do. However, the present invention is not limited to this. For example, even if a program operating in the data reception device 1 or the data transmission device 2 transmits a unique response packet or determines the amount of data packets that can be uniquely transmitted. good.

  The data receiving apparatus 1 of this embodiment includes a data transmission / reception means 11, a target transmission speed estimation means 12, a current transmission speed estimation means 13, a transmission control state estimation means 14, and a response transmission frequency determination means 15. Each of these means generally operates as follows.

  The data transmission / reception means 11 receives the data packet transmitted from the data transmission device 2 via the network 4, and the transmission frequency determined by the response transmission frequency determination means 15 indicates a response packet indicating whether or not the data packet has been normally received. Is transmitted to the data transmission device 2.

  The target transmission speed estimation means 12 estimates the available bandwidth of the network 4 based on the reception result of the data packet by the data transmission / reception means 11, and estimates the target transmission speed based on the estimated available bandwidth.

  The current transmission speed estimation means 13 estimates the speed at which the data transmission apparatus 2 sends the data packet at the present time based on the reception result of the data packet by the data transmission / reception means 11.

  The transmission control state estimation means 14 estimates what determination method is used when determining the amount of data packets that can be transmitted. The estimation method is based on the result of data packet reception by the data transmission / reception means 11 and the current transmission speed estimated by the current transmission speed estimation means 13. And when determining the amount of data packets that can be transmitted.

  The response transmission frequency determining unit 15 determines the transmission frequency of the response packet that the data transmitting / receiving unit 11 transmits to the data transmitting device 2. This transmission frequency is determined by determining the target transmission speed estimated by the target transmission speed estimation means 12, the current transmission speed estimated by the current transmission speed estimation means 13, and the transmittable data packet estimated by the transmission control state estimation means 14. This is based on one or more pieces of information on how to determine the quantity. In particular, based on the estimated target transmission rate and the estimated current transmission rate, the response packet transmission frequency is determined so that the current transmission rate approaches the target transmission rate.

  The data transmitting / receiving means 11 receives the data packet when the data packet is transmitted from the data transmitting device 2. Further, when the response transmission frequency determining means 15 determines the transmission frequency of the response packet, a response packet indicating whether or not the data packet has been normally received is transmitted to the data transmission device 2 with the determined transmission frequency. To do.

  Here, the method of transmitting the response packet at the transmission frequency is a method of adjusting the number of times of transmission of the response packet so as to conform to the transmission frequency, for example. Specifically, for example, when the response transmission frequency determining unit 15 determines that the response packet is transmitted at a frequency that is 1/5 times the arrival frequency of the data packet, the data transmitting / receiving unit 11 receives each of five data packets. One response packet is transmitted. For example, when the response transmission frequency determining unit 15 determines that the response packet is transmitted at a frequency five times the arrival frequency of the data packet, the data transmitting / receiving unit 11 receives five response packets every time one data packet is received. Send.

  Moreover, not only the said transmission method but the method of adjusting the transmission time interval of a response packet so that the said transmission frequency may be followed, for example may be used. Specifically, for example, when the response transmission frequency determination unit 15 determines that the response packet is transmitted at a frequency five times the arrival frequency of the data packet, the data transmission / reception unit 11 determines the data packet reception time interval or its statistical value. The response packet is transmitted at a time interval obtained by multiplying the calculated value by 1/5.

  For example, when the response transmission frequency determining unit 15 determines that the response packet is transmitted at a frequency that is 1/5 times the arrival frequency of the data packet, the data transmitting / receiving unit 11 responds at a time interval obtained by multiplying the calculated value by five. Send the packet. Here, when the protocol used for communication between the data receiving apparatus 1 and the data transmitting apparatus 2 is TCP, when transmitting two or more response packets for one data packet, duplicate ACK Therefore, the next sequence number is described in the response packet and transmitted as if the sequence number up to the middle of the data packet has already been received.

  Specifically, for example, when receiving one data packet having a sequence number of 10001 to 11400 and transmitting five response packets, the data transmitting / receiving unit 11 has, for example, a sequence number to be requested. Response packets described as 10281, 10561, 10841, 11121, and 11401 are transmitted to the data transmitting apparatus 2. Further, the sequence number described in the response packet may be sequentially described as a value that is one or more larger, and the smallest sequence number that has not been received may be described in the last response packet. As a result, there is no restriction to increase the sequence number in the same way as in the above example. For example, response packets with the requested sequence numbers of 10002, 10003, 10004, 10005, and 11401 are sent to the data transmission device 2, respectively. You may send it.

  The target transmission rate estimation means 12 estimates the usable bandwidth of the network 4 based on the reception result of the data packet by the data transmission / reception means 11 when the data transmission / reception means 11 receives the data packet or at regular intervals, A target transmission rate is estimated based on the available bandwidth. Here, the method for estimating the available bandwidth is, for example, a method for estimating the available bandwidth as a value obtained by dividing the size of the data packet or its statistical value by the reception interval of the data packet data transmission / reception means 11 or its statistical value. .

  Further, not limited to the above estimation method, for example, data packets whose reception intervals in the data transmission / reception means 11 are equal to or smaller than a predetermined threshold are regarded as a group of packet groups, and the size of the packet group or its statistical value is determined as the packet group. Alternatively, a method of estimating the available bandwidth may be a time taken to receive the value or a value divided by the statistical value.

  The target transmission rate estimation method here is, for example, a method of estimating the estimated available bandwidth as it is as the target transmission rate. Further, not limited to the estimation method, for example, a round-trip delay time between the data transmission device 2 and the data reception device 1 is calculated using a time stamp value or the like, and the round-trip delay time or a statistical value thereof is estimated. A method of estimating the target transmission rate by a value obtained by multiplying the available bandwidth may be used.

  The current transmission rate estimation unit 13 is configured so that the data transmission device 2 currently receives data packets when the data transmission / reception unit 11 receives a data packet or at regular intervals based on the reception result of the data packet by the data transmission / reception unit 11. Estimate the current transmission rate for sending packets. Here, the method for estimating the current transmission rate is, for example, calculating a round trip delay time between the data transmitting device 2 and the data receiving device 1 using a time stamp value or the like, and data between the round trip delay times. In this method, the size of the data packet received by the transmission / reception means 11 or its statistical value is estimated as the current transmission rate.

  Further, not limited to the above estimation method, for example, a value obtained by dividing the size of the data packet received by the data transmitting / receiving unit 11 during the round-trip delay time or a statistical value thereof by the round-trip delay time or the statistical value is the current A method of estimating the transmission speed may be used.

  The transmission control state estimation means 14 is the data sent by the data transmission / reception means 11 when the data transmission / reception means 11 receives a data packet, when the current transmission speed estimation means 13 estimates the current transmission speed, or at regular intervals. When the data transmission apparatus 2 determines the amount of data packets that can be transmitted based on the contents of the response packet and the reception status based on the packet reception result and the current transmission speed estimated by the current transmission speed estimation means 13 In addition, the transmission control state of what determination method is used is estimated.

  Here, the transmission control state estimation method is, for example, when the protocol used for communication between the data reception device 1 and the data transmission device 2 is TCP, whether the TCP of the data transmission device 2 is in the slow start phase. This is a method for estimating whether or not the congestion avoidance phase is in effect. Specifically, when the data transmission / reception means 11 transmits the response packet having the same sequence number to be requested three times in succession, or the current transmission speed estimated by the current transmission speed estimation means 13 is set to the previous value in advance. If it is smaller than a value obtained by multiplying a predetermined constant α, or if the current transmission speed estimated by the current transmission speed estimation means 13 is smaller than a value obtained by adding a predetermined constant β to the previous value, congestion avoidance is achieved. It is estimated that the phase has shifted to the phase, and it is estimated that the phase has shifted to the slow start phase immediately after the start of communication or when the current transmission rate estimated by the current transmission rate estimation means 13 is smaller than a predetermined threshold.

  Further, not limited to the above estimation method, for example, even if the protocol used for communication between the data reception device 1 and the data transmission device 2 is other than TCP, the determination algorithm is known or notified in advance, A method of estimating the transmission control state in the same manner by setting a determination condition in accordance with the behavior of the determination algorithm may be used.

  The response transmission frequency determination means 15 is used when the data transmission / reception means 11 receives a data packet, when the target transmission speed estimation means 12 estimates the target transmission speed, or when the current transmission speed estimation means 13 determines the current transmission speed. The target transmission speed estimated by the target transmission speed estimation means 12 and the current transmission speed estimation means 13 are estimated when the estimation is performed, or when the transmission control state estimation means 14 estimates the transmission control state, or at regular intervals. The data transmitting / receiving unit 11 transmits to the data transmitting device 2 based on one or more information of the determined current transmission rate and the method of determining the amount of transmittable data packets estimated by the transmission control state estimating unit 14. Determine the transmission frequency of response packets.

  Here, the transmission frequency represents a magnification value larger than 0 indicating how many response packets are transmitted for one data packet. Specifically, the response transmission frequency determination means 15 determines whether to use one of two different transmission frequency determination methods, a high frequency determination method and a low frequency determination method, and further determines the determined transmission frequency. The response packet transmission frequency is determined using the above-described determination method. Here, the determination method of whether to use either the high frequency determination method or the low frequency determination method is, for example, the target transmission rate estimated by the target transmission rate estimation unit 12 is the current transmission rate estimated by the current transmission rate estimation unit 13. In this method, it is determined that the high-frequency determination method is used when the speed is smaller than a value obtained by multiplying a predetermined constant γ, and the low-frequency determination method is determined otherwise.

  Further, not limited to the above determination method, when the transmission control state estimation means 14 estimates that the TCP of the data transmission device 2 is in the slow start phase, for example, it is determined that the high-frequency determination method is used, and the data transmission device 2 When it is estimated that the current TCP is in the congestion avoidance phase, it may be determined that the low-frequency determination method is used.

  As a method for determining the transmission frequency of the response packet, there is a method of determining the transmission frequency determined by the high frequency determination method to be larger than the transmission frequency determined by the low frequency determination method. As a specific determination method, the transmission frequency determination method in the high frequency determination method is, for example, that the transmission frequency increases as the target transmission speed estimated by the target transmission speed estimation means 12 increases, or the current transmission speed estimation. In this method, the transmission frequency is determined using a function in which the transmission frequency decreases as the current transmission speed estimated by the means 13 increases.

  More specifically, when the target transmission rate is A, the current transmission rate is B, and predetermined constants are δ (positive real number) and ε (real number), the transmission frequency is (A / B). This is a method determined by ^ (1 / δ) −ε. Further, not limited to the above determination method, for example, the transmission frequency may be determined by (A / B) × (1 / δ) −ε. For example, any of the above determination methods may be A method may be used in which the calculation is performed only immediately after the transition to the frequency determination method or immediately after the start of communication, and the same transmission frequency is continuously used until the transition to the low frequency determination method.

  For example, when the low frequency determination method determines a transmission frequency smaller than that of the background art TCP, a method of determining the same transmission frequency as that of the background art TCP may be used. Here, δ indicates how fast the target transmission speed is reached. For example, when the target transmission speed is reached in about five times the round-trip delay time, it is desirable that δ = 5. Ε is a numerical value for adjusting the transmission frequency, and it is desirable that ε = 1 or ε = 1 / δ. However, the present invention is not limited to the above numerical examples, and other numerical values may be set.

  In addition, the transmission frequency determination method in the low frequency determination method is a method of determining the transmission frequency, for example, using a function that decreases the transmission frequency as the current transmission speed increases. More specifically, the transmission frequency is determined by ζ / B−η, where ζ (positive real number) and η (real number) are predetermined constants. Further, the method is not limited to the above determination method, and is a method of determining the transmission frequency to a predetermined constant θ, for example. In addition to the above determination method, for example, when the high-frequency determination method determines a transmission frequency larger than that of the background art TCP, a method of determining the same transmission frequency as that of the background art TCP may be used. . Here, ζ indicates how many response packets are transmitted. For example, when approximately 10 response packets are transmitted within the round-trip delay time, it is desirable that ζ = 10. Η is a numerical value for adjusting the transmission frequency, and it is desirable to set η = 0. However, the present invention is not limited to the above numerical examples, and other numerical values may be set.

  The response transmission frequency determining means 15 can transmit the target transmission speed estimated by the target transmission speed estimation means 12, the current transmission speed estimated by the current transmission speed estimation means 13, and the transmission control state estimation means 14 estimated. One or more information of the method for determining the amount of data packets is used. However, if some of the above information is not used, the response transmission frequency determining unit 15 may be configured not to include an estimation unit corresponding to the above unused information in the first embodiment.

[Description of operation]
Next, the operation of the first embodiment of the present invention will be described with reference to FIGS.

  First, the data transmission / reception means 11 receives the data packet when the data packet is transmitted from the data transmission device 2 via the network 4 (step S11).

  The target transmission speed estimation means 12 estimates the usable bandwidth of the network 4 based on the reception result of the data packet by the data transmission / reception means 11 when the data transmission / reception means 11 receives the data packet or at regular intervals. Furthermore, the target transmission rate estimation means 12 estimates the target transmission rate based on the available bandwidth thus estimated (step S12).

  When the current transmission speed estimation means 13 receives the data packet by the data transmission / reception means 11 or at regular intervals, the data transmission apparatus 2 is currently receiving data based on the data packet reception result by the data transmission / reception means 11. The current transmission speed for sending the packet is estimated (step S13).

  When the data transmission / reception means 11 receives a data packet, or when the current transmission speed estimation means 13 estimates the current transmission speed, or at regular intervals, the transmission control state estimation means 14 receives data packets. When the data transmission apparatus 2 determines the amount of data packets that can be transmitted based on the contents of the response packet and the reception status based on the packet reception result and the current transmission speed estimated by the current transmission speed estimation means 13 Next, the transmission control state of what kind of determination method is used is estimated (step S14).

  Next, the response transmission frequency determination unit 15 determines the transmission frequency of the response packet that the data transmission / reception unit 11 transmits to the data transmission device 2 (step S15). The transmission frequency of the response packet includes the target transmission speed estimated by the target transmission speed estimation means 12, the current transmission speed estimated by the current transmission speed estimation means 13, and the transmittable data packet estimated by the transmission control state estimation means 14. It is determined on the basis of one or more pieces of information on how to determine the amount. In particular, based on the estimated target transmission rate and the estimated current transmission rate, the transmission frequency of the response packet is determined so that the current transmission rate approaches the target transmission rate. Further, the transmission frequency of the response packet is determined when the data transmission / reception means 11 receives the data packet, when the target transmission speed estimation means 12 estimates the target transmission speed, or when the current transmission speed estimation means 13 This is performed when the transmission speed is estimated, when the transmission control state estimation means 14 estimates the transmission control state, or at regular intervals.

  Next, when the data transmission / reception means 11 receives the data packet or at regular intervals, the transmission frequency determined by the response transmission frequency determination means 15 is a response packet indicating whether or not the data packet has been normally received. Is transmitted to the data transmitting apparatus 2 (step S16).

[Description of effects]
According to the present embodiment, the data transmission / reception unit 11 is based on one or more information of the estimated target transmission rate, the estimated current transmission rate, and the estimated method of determining the amount of data packets that can be transmitted. The response transmission frequency determination means 15 determines the transmission frequency of the response packet transmitted to the data transmission device 2.

  As a result, the available bandwidth is estimated, and based on the estimation result, it is judged how fast and how fast the amount of data that can be transmitted by the transport protocol of the data transmission device 2 increases, and the response packet reply frequency is changed. To do. As a result, the available bandwidth can be accelerated so that it can be used up quickly, and unnecessary reply packets can be suppressed.

In particular, the current transmission rate approaches the target transmission rate based on the estimated target transmission rate and the estimated current transmission rate of the transmission frequency of the response packet transmitted from the data transmitting / receiving unit 11 to the data transmission device 2. By determining the response packet transmission frequency, the response packet transmission frequency can be optimized, and the received traffic can be further increased in speed.

[Second Embodiment]
Next, an apparatus and method for speeding up received traffic according to the second embodiment of the present invention will be described. FIG. 4 is a block diagram for explaining an apparatus for speeding up received traffic according to the second embodiment of this invention. FIG. 5 is a flowchart for explaining the operation of the speed-up device for received traffic according to the second embodiment of the present invention. It should be noted that the same reference numerals are assigned to the same elements as those in the speed-up device for receiving traffic according to the first embodiment, and the detailed description thereof is omitted.

[Description of configuration]
This embodiment is a case where the present embodiment is applied to a system including a relay server 3 that once terminates data communication between the data transmission device 2 and the data reception device 1. In other words, the present embodiment is a case where the above-described speed-up device and speed-up method for received traffic are applied to the relay server 3 that once terminates data communication between the data transmission device 2 and the data reception device 1. .

  Referring to FIG. 4, the second embodiment of the present invention is different from the first embodiment in that the data transmission device 2 and the data reception device 1 are a cache server, a proxy server, a MEC (Mobile Edge Computing) server, and the like. And a relay server 3 that once terminates data communication between the data transmission device 2 and the data reception device 1. In the present embodiment, in the network 4 of the first embodiment, a section between the data transmission device 2 and the relay server 3 is a transmission side network 41, and a section between the relay server 3 and the data reception device 1 is a reception side network. 42.

  Each of these means generally operates as follows.

  The data receiving device 1 may have the same configuration as the data receiving device 1 of the first embodiment, or may have the same configuration as the data receiving device of the background art without having a special configuration.

  The relay server 3 sends data packets received from the data transmission device 2 to the data reception device 1 of the first embodiment via the reception side network 42 to the data reception device 1 (reception side). 112 is further included. The relay server 3 includes a data transmission / reception unit (transmission side) 111 instead of the data transmission / reception unit 11 of the first embodiment.

  The data transmission / reception means (transmission side) 111 receives the data packet from the data transmission / reception means (reception side) 112 when receiving the data packet from the data transmission device 2 in addition to the operation of the data transmission / reception means 11 of the first embodiment. Forward to.

  The data transmission / reception means (reception side) 112 transmits the data packet to the data reception device 1 via the reception side network 42 when the data packet is transferred from the data transmission / reception means (transmission side) 111. Then, when a response packet corresponding to the data packet is received from the data receiving device 1, according to the information described in the response packet, data packets that can be transmitted simultaneously without confirming normal reception The amount is determined, and the data packet is transmitted to the data receiving device 1 according to the amount of the transmittable data packet.

  In addition to the operation of the target transmission rate estimation unit 12 of the first embodiment, the target transmission rate estimation unit 12 performs data transmission / reception when the data transmission / reception unit (reception side) 112 receives a response packet or at regular intervals. Based on the reception result of the response packet by the means (reception side) 112, the available bandwidth of the reception side network 42 is estimated, and the availability of the transmission side network 41 estimated in the same manner as the target transmission rate estimation means 12 of the first embodiment. The target transmission rate is estimated based on the bandwidth and the available bandwidth on the receiving side. Here, the estimation method of the available bandwidth on the receiving side is, for example, the size of data that has been newly confirmed to be normal arrival at the data receiving device 1 by the response packet received by the data transmitting / receiving means (receiving side) 112 or the size thereof. This is a method of estimating the available bandwidth on the receiving side by dividing the statistical value by the reception interval of the response packet data transmission / reception means (receiving side) 112 or its statistical value. In addition to the above estimation method, for example, a response packet whose reception interval in the data transmission / reception means (reception side) 112 is equal to or smaller than a predetermined threshold is regarded as a group of response packets, and the data reception device is based on the response packet group. A method of estimating the available bandwidth on the receiving side by dividing the size of the data for which normal arrival at 1 is newly confirmed or the statistical value thereof by the time taken to receive the response packet group or the statistical value thereof It is also possible that the data size stays in the relay server 3, that is, data packets that have been received by the data transmission / reception means (transmission side) 111 and have not yet been transmitted by the data transmission / reception means (reception side) 112. The size is measured, and the increase rate of the staying data size (when it is decreasing, it is regarded as a negative value increase rate) is the target transmission rate of the first embodiment. A method of estimating a value obtained by subtracting from the available bandwidth of the transmission side network 41 estimated in the same manner as the estimation means 12 as the available bandwidth on the reception side may be used, or the data received by the data transmission / reception means (transmission side) 111 may be used. The packets are temporarily retained in the relay server 3, and the retained data packets are collectively transmitted from the data transmission / reception means (reception side) 112, and the throughput obtained by the transmission of the retained data packets is represented by A method of estimating the available bandwidth on the receiving side may be used, and the available bandwidth obtained in the previous communication session between the relay server 3 and the data receiving device 1 on the assumption that the available bandwidth on the receiving side does not change suddenly. Alternatively, a method of estimating the maximum throughput value as the available bandwidth on the receiving side may be used. In addition, here, the target transmission speed is estimated by, for example, estimating one of the available bandwidth of the transmission-side network 41 and the available bandwidth of the reception-side network 42 or the smaller value as the target transmission speed. It is a method to do. Further, not limited to the above estimation method, for example, the round-trip delay time between the data transmission apparatus 2 and the relay server 3 (the round-trip delay time of the transmission-side network 41) using the time stamp value, etc., and the relay server 3 The round trip delay time (round trip delay time of the receiving side network 42) with the data receiving apparatus 1 is calculated, and the round trip delay time of the sending side network 41 or its statistical value is multiplied by the available band of the sending side network 41. A value and a value obtained by multiplying the round-trip delay time of the reception side network 42 or the statistical value thereof by the available bandwidth of the reception side network 42 or a smaller value as the target transmission rate. There may be.

[Description of operation]
Next, the operation of the second embodiment of the present invention will be described with reference to FIGS.

  First, when the data transmission / reception means (transmission side) 111 of the relay server 3 receives the data packet when the data packet is transmitted from the data transmission device 2 via the transmission side network 41, the data packet is transmitted to the data packet. The data is transferred to the transmitting / receiving means (receiving side) 112 (step S21).

  When the data transmission / reception means (reception side) 112 of the relay server 3 transfers the data packet from the data transmission / reception means (transmission side) 111, the data packet is transmitted to the data reception device 1 via the reception side network 42. (Step S22).

  The target transmission speed estimation unit 12 transmits the data packet when the data transmission / reception unit (transmission side) 111 receives the data packet or at regular intervals based on the reception result of the data packet by the data transmission / reception unit (transmission side) 111. The available bandwidth of the side network 41 is estimated. Further, the target transmission speed estimation means 12 is based on the reception result of the response packet by the data transmission / reception means (reception side) 112 when the data transmission / reception means (reception side) 112 receives the response packet or at regular intervals. The available bandwidth of the receiving network 42 is estimated. Based on the estimated available bandwidth on the transmitting side and the estimated available bandwidth on the receiving side, the target transmission rate estimating means 12 estimates the target transmission rate (step S23).

  Based on the reception result of the data packet by the data transmission / reception means (transmission side) 111 when the current transmission speed estimation means 13 receives the data packet by the data transmission / reception means (transmission side) 111 or at regular intervals, The current transmission speed is estimated (step S24). This current transmission rate is a transmission rate at which the data transmission device 2 transmits a data packet at the present time.

  The transmission control state in which the transmission control state estimation means 14 uses a determination method when the data transmission device 2 determines the amount of data packets that can be transmitted based on the contents of the response packet and the reception status. Is estimated (step S25). The amount of data packets that can be transmitted is determined when the data transmission / reception means (transmission side) 111 receives a data packet, when the current transmission speed estimation means 13 estimates the current transmission speed, or at regular intervals. To do.

  Next, the response transmission frequency determining means 15 transmits the target transmission speed estimated by the target transmission speed estimation means 12, the current transmission speed estimated by the current transmission speed estimation means 13, and the transmission control state estimation means estimated by the transmission control state estimation means 14. Based on one or more pieces of information in the data packet amount determination method, the data transmission / reception means (transmission side) 111 determines the transmission frequency of the response packet transmitted to the data transmission apparatus 2 (step S26). In particular, based on the estimated target transmission rate and the estimated current transmission rate, the transmission frequency of the response packet is determined so that the current transmission rate approaches the target transmission rate. This transmission frequency is determined when the data transmission / reception means (transmission side) 111 receives a data packet, when the target transmission speed estimation means 12 estimates the target transmission speed, or when the current transmission speed estimation means 13 This is performed when the transmission speed is estimated, when the transmission control state estimation means 14 estimates the transmission control state, or at regular intervals.

  Next, when the data transmission / reception means (transmission side) 111 receives the data packet or at regular intervals, the response transmission frequency determination means 15 sends a response packet indicating whether or not the data packet has been normally received. The data is transmitted to the data transmission device 2 with the determined transmission frequency (step S27).

[Description of effects]
According to the present embodiment, based on one or more information of the estimated target transmission rate, the estimated current transmission rate, and the estimated method of determining the amount of data packets that can be transmitted, data transmission / reception means ( The response transmission frequency determination means 15 determines the transmission frequency of the response packet transmitted from the transmission side) 111 to the data transmission device 2.

  As a result, the available bandwidth is estimated, and based on the estimation result, it is judged how fast and how fast the amount of data that can be transmitted by the transport protocol of the data transmission device 2 increases, and the response packet reply frequency is changed. To do. As a result, the available bandwidth can be accelerated so that it can be used up quickly, and unnecessary reply packets can be suppressed.

  In particular, based on the estimated target transmission rate and the estimated current transmission rate of the transmission frequency of the response packet transmitted from the data transmitting / receiving unit (transmission side) 111 to the data transmitting device 2, the current transmission rate is the target transmission By determining the response packet transmission frequency so as to approach the speed, the response packet transmission frequency can be optimized, and the reception traffic can be further increased in speed.

  Furthermore, in this embodiment, the target transmission rate estimation means 12 of the relay server 3 estimates the target transmission rate based on the reception result of the data packet and the reception result of the response packet. As a result, even in a system including the relay server 3 that once terminates data communication between the data transmission device 2 and the data reception device 1, the available bandwidth is accelerated so that it can be used up quickly, and an unnecessary acknowledgment packet is returned. Can be suppressed.

[Other Embodiments]
The apparatus for speeding up received traffic according to each embodiment of the present invention described above can also be realized by an information processing apparatus that can execute a program that realizes such a configuration and operation. For example, the speed-up device for received traffic according to the present invention may be realized by reading and executing a program for causing the information processing device to execute the speed-up method described above. This program can be distributed in the form of a computer-readable recording medium. The functions of the present embodiment may be realized by software by reading a program recorded in such a recording medium and executing the program by the information processing apparatus.

  FIG. 6A is a block diagram for explaining an apparatus for accelerating received traffic according to another embodiment of the present invention, and FIG. 6B is used for an apparatus for accelerating received traffic according to another embodiment. It is a block diagram which shows an example of the information processing apparatus used. The information processing apparatus 300 in FIG. 6B includes a CPU (Central Processing Unit) 301 and a memory 302. With the information processing apparatus 300 having such a hardware configuration, the speed-up apparatus for receiving traffic according to the above-described embodiment of the present invention can be realized. That is, the CPU 301 is caused to execute a target transmission speed estimation process, a current transmission speed estimation process, a response transmission frequency determination process, and the like to estimate an available bandwidth, and to transmit the transport protocol of the data transmission apparatus based on the estimation result What is necessary is just to determine how much the data amount increases and how fast, and to change the reply frequency of the acknowledgment packet. A program for executing such processing can be distributed in the form of a recording medium on which the program is recorded. This program is a general-purpose semiconductor recording device such as CF (Compact Flash (registered trademark)) and SD (Secure Digital), a magnetic recording medium such as a flexible disk, or a CD-ROM (Compact Disc Read Only Memory). ) And the like in the form of an optical recording medium.

  As mentioned above, although preferable embodiment of this invention was described, this invention is not limited to this. It goes without saying that various modifications are possible within the scope of the invention described in the claims, and these are also included in the scope of the present invention.

A part or all of the above-described embodiment can be described as in the following supplementary notes, but is not limited thereto.
(Appendix 1) A speed-up device for receiving traffic used in a data receiving device that returns a response packet to a data packet received from a data transmitting device,
Target transmission speed estimation means for estimating the available bandwidth of the network based on the reception result of the data packet and estimating the target transmission speed based on the estimated available bandwidth;
Current transmission rate estimation means for estimating a current transmission rate at which the data transmission device transmits the data packet based on the reception result of the data packet;
A response transmission frequency determining means for determining a response packet transmission frequency based on the estimated target transmission rate and the estimated current transmission rate so that the current transmission rate approaches the target transmission rate. Traffic acceleration device.
(Supplementary Note 2) The response transmission frequency determination means determines which one of the first transmission frequency determination method and the second transmission frequency determination method is used to determine the transmission frequency of the response packet according to a condition. ,
The transmission frequency of the response packet determined by the first transmission frequency determination method is set to be larger than the transmission frequency of the response packet determined by the second transmission frequency determination method. The speed-up device for the received traffic as described.
(Supplementary Note 3) When using the first transmission frequency determination method, the response transmission frequency determination means increases the response packet transmission frequency as the target transmission speed increases, or increases as the current transmission speed increases. The apparatus for accelerating reception traffic according to appendix 2, wherein the transmission frequency of the response packet is determined using a function that reduces the transmission frequency of the response packet.
(Supplementary Note 4) When using the first transmission frequency determination method, the response transmission frequency determination means multiplies the value obtained by dividing the target transmission speed by the current transmission speed by the first constant power or the first constant. 4. The apparatus for speeding up received traffic according to appendix 2 or appendix 3, wherein the transmission frequency of the response packet is determined using a value obtained by subtracting a second constant.
(Supplementary Note 5) When using the second transmission frequency determination method, the response transmission frequency determination means uses a function that decreases the transmission frequency of the response packet as the current transmission speed increases. The apparatus for accelerating reception traffic according to any one of Supplementary Note 2 to Supplementary Note 4, wherein:
(Supplementary Note 6) The response transmission frequency determination means determines that the first transmission frequency determination method is used when the current transmission speed is smaller than a value obtained by multiplying the target transmission speed by a third constant, 6. The apparatus for speeding up received traffic according to any one of appendices 2 to 5, wherein the second transmission frequency determination method is determined to be used in other cases.
(Supplementary note 7) When the protocol used for communication between the data transmission device and the data reception device is TCP (Transmission Control Protocol),
Based on the reception status of the data packet and the current transmission speed, further comprising a transmission control state estimation means for estimating whether the congestion control state in the data transmission device is slow start or congestion avoidance,
The response transmission frequency determination means determines that the first transmission frequency determination method is used when the transmission control state estimation means estimates that the congestion control state is a slow start, and is congestion avoidance. The reception traffic speed-up device according to any one of Supplementary Note 2 to Supplementary Note 5, wherein when estimated, the second transmission frequency determination method is determined to be used.
(Appendix 8) Applied to a relay server installed between the data transmitting device and the data receiving device,
The target transmission rate estimation means estimates a first available bandwidth in a network between the data transmission device and the relay server based on a reception state of a data packet from the data transmission device, and receives the data reception A second available bandwidth in the network between the relay server and the data receiving device is estimated based on the reception status of the response packet from the device or the rate of change in the amount of data remaining in the relay server. The reception traffic speed-up device according to any one of Supplementary Note 1 to Supplementary Note 7, wherein the target transmission rate is estimated based on the first usable bandwidth and the second usable bandwidth.
(Supplementary note 9) A method for speeding up received traffic used in a data receiving apparatus that returns a response packet to a data packet received from a data transmitting apparatus,
Estimate the available bandwidth of the network based on the reception result of the data packet, estimate the target transmission speed based on the estimated available bandwidth,
Based on the reception result of the data packet, estimate the current transmission rate at which the data transmission device sends the data packet,
A method for speeding up received traffic, wherein a transmission frequency of response packets is determined based on the estimated target transmission rate and the estimated current transmission rate so that the current transmission rate approaches the target transmission rate.
(Supplementary Note 10) The determination of the transmission frequency of the response packet is to determine which of the first transmission frequency determination method and the second transmission frequency determination method is used to determine the transmission frequency of the response packet according to the conditions. Judgment
The transmission frequency of the response packet determined by the first transmission frequency determination method is set to be larger than the transmission frequency of the response packet determined by the second transmission frequency determination method. The method for speeding up the received traffic as described.
(Additional remark 11) When using the said 1st transmission frequency determination method, the transmission frequency of a response packet becomes large, so that a target transmission rate is large, or the function which becomes small the transmission frequency of a response packet, so that the present transmission rate is large. The method for speeding up received traffic according to appendix 10, wherein the frequency of transmission of the response packet is determined.
(Supplementary note 12) When the first transmission frequency determination method is used, a value obtained by dividing the target transmission speed by the current transmission speed is multiplied by the first constant or the first constant, and then the second constant is set. 12. The method for speeding up received traffic according to appendix 10 or appendix 11, wherein a transmission frequency of the response packet is determined using a subtracted value.
(Supplementary note 13) When the second transmission frequency determination method is used, the transmission frequency of the response packet is determined using a function that decreases the transmission frequency of the response packet as the current transmission rate increases. 12. The method for speeding up received traffic according to any one of 12 above.
(Supplementary Note 14) When the current transmission speed is smaller than the value obtained by multiplying the target transmission speed by the third constant, it is determined that the first transmission frequency determination method is used, and in other cases, the second transmission frequency is determined. The method for speeding up received traffic according to any one of Supplementary Note 10 to Supplementary Note 13, wherein it is determined that a transmission frequency determination method is used.
(Supplementary Note 15) When the protocol used for communication between the data transmission device and the data reception device is TCP (Transmission Control Protocol),
Based on the reception status of the data packet and the current transmission speed, estimate whether the congestion control state in the data transmission device is slow start or congestion avoidance,
When it is estimated that the congestion control state is a slow start, it is determined that the first transmission frequency determination method is used, and when it is estimated that congestion is avoided, the second transmission frequency determination method is The method for speeding up received traffic according to any one of Supplementary Note 10 to Supplementary Note 13, which is determined to be used.
(Appendix 16) Applied to a relay server installed between the data transmitting device and the data receiving device,
Based on the reception status of the data packet from the data transmission device, the first available bandwidth in the network between the data transmission device and the relay server is estimated, and the reception status of the response packet from the data reception device Or estimating a second available bandwidth in the network between the relay server and the data receiving device based on the rate of change of the amount of data remaining in the relay server, and the first available bandwidth The method for speeding up received traffic according to any one of Supplementary Note 9 to Supplementary Note 15, wherein the target transmission rate is estimated based on the second available bandwidth.
(Supplementary note 17) A speed-up program for received traffic used in a data receiving apparatus that returns a response packet to a data packet received from a data transmitting apparatus,
On the computer,
A target transmission rate estimation process for estimating the available bandwidth of the network based on the reception result of the data packet and estimating the target transmission rate based on the estimated available bandwidth;
Based on the reception result of the data packet, a current transmission rate estimation process for estimating a current transmission rate at which the data transmission device transmits the data packet;
Based on the estimated target transmission rate and the estimated current transmission rate, a response transmission frequency determination process is performed to determine a transmission frequency of response packets so that the current transmission rate approaches the target transmission rate. Receive traffic acceleration program.
(Supplementary Note 18) In the response transmission frequency determination process, it is determined which of the first transmission frequency determination method and the second transmission frequency determination method is used to determine the response packet transmission frequency according to conditions. ,
The transmission frequency of the response packet determined by the first transmission frequency determination method is set to be larger than the transmission frequency of the response packet determined by the second transmission frequency determination method. The program for accelerating reception traffic as described.
(Supplementary Note 19) In the response transmission frequency determination process, when the first transmission frequency determination method is used, the response packet transmission frequency increases as the target transmission speed increases, or the response packet increases as the current transmission speed increases. 19. The received traffic speed-up program according to appendix 18, wherein the transmission frequency of the response packet is determined using a function that reduces the transmission frequency of the response packet.
(Supplementary Note 20) In the response transmission frequency determination process, when the first transmission frequency determination method is used, a value obtained by dividing the target transmission speed by the current transmission speed is multiplied by the first constant or the first constant. The received traffic speed-up program according to appendix 18 or appendix 19, wherein the transmission frequency of the response packet is determined using a value obtained by subtracting the second constant.
(Supplementary Note 21) In the response transmission frequency determination process, when the second transmission frequency determination method is used, the response packet transmission frequency is calculated by using a function in which the response packet transmission frequency decreases as the current transmission speed increases. The reception traffic speed-up program according to any one of Supplementary Note 18 to Supplementary Note 20, wherein:
(Supplementary Note 22) In the response transmission frequency determination process, when the current transmission speed is smaller than a value obtained by multiplying the target transmission speed by a third constant, it is determined that the first transmission frequency determination method is used, The received traffic speed-up program according to any one of appendix 18 to appendix 21, wherein the second transmission frequency determination method is determined to be used in other cases.
(Supplementary Note 23) When the protocol used for communication between the data transmitting device and the data receiving device is TCP (Transmission Control Protocol),
Causing the computer to further execute a transmission control state estimation process for estimating whether the congestion control state in the data transmission device is slow start or congestion avoidance based on the reception status of the data packet and the current transmission speed. ,
In the response transmission frequency determination process, when it is estimated that the congestion control state is a slow start by the transmission control state estimation process, it is determined that the first transmission frequency determination method is used, and congestion avoidance is performed. The program for accelerating reception traffic according to any one of Supplementary Note 18 to Supplementary Note 21, which is determined to use the second transmission frequency determination method when estimated.
(Appendix 24) Applied to a relay server installed between the data transmitting device and the data receiving device,
In the target transmission rate estimation process, a first available bandwidth in a network between the data transmission device and the relay server is estimated based on a reception state of a data packet from the data transmission device, and the data reception A second available bandwidth in the network between the relay server and the data receiving device is estimated based on the reception status of the response packet from the device or the rate of change in the amount of data remaining in the relay server. 24. The program for speeding up received traffic according to any one of supplementary notes 17 to 23, wherein the target transmission rate is estimated based on the first usable bandwidth and the second usable bandwidth.

  The present invention can be applied to a data receiving device such as a user terminal at the time of data download or a server at the time of data upload. Further, the present invention can be applied to a relay server device that is installed in the middle of a data transmission / reception route and transfers packets communicated between the data transmission / reception devices.

1 Data receiving device 11 Data transmitting / receiving means 111 Data transmitting / receiving means (transmitting side)
112 Data transmission / reception means (receiving side)
12, 201 Target transmission speed estimation means 13, 202 Current transmission speed estimation means 14 Transmission control state estimation means 15, 203 Response transmission frequency determination means 2 Data transmission device 3 Relay server 4 Network 41 Transmission side network 42 Reception side network 200 Reception traffic Speed-up device 300 Information processing device 301 CPU
302 memory

Claims (10)

An apparatus for speeding up received traffic used in a data receiving apparatus that returns a response packet to a data packet received from a data transmitting apparatus,
Target transmission speed estimation means for estimating the available bandwidth of the network based on the reception result of the data packet and estimating the target transmission speed based on the estimated available bandwidth;
Current transmission rate estimation means for estimating a current transmission rate at which the data transmission device transmits the data packet based on the reception result of the data packet;
A response transmission frequency determining means for determining a response packet transmission frequency based on the estimated target transmission rate and the estimated current transmission rate so that the current transmission rate approaches the target transmission rate. Traffic acceleration device. The response transmission frequency determination means determines which one of the first transmission frequency determination method and the second transmission frequency determination method is used to determine the transmission frequency of the response packet according to conditions,
The transmission frequency of the response packet determined by the first transmission frequency determination method is set to be larger than the transmission frequency of the response packet determined by the second transmission frequency determination method. An apparatus for speeding up received traffic as described in 1.   When the response transmission frequency determination means uses the first transmission frequency determination method, the response packet transmission frequency increases as the target transmission speed increases, or the response packet transmission frequency increases as the current transmission speed increases. The speed-up device for received traffic according to claim 2, wherein a transmission frequency of the response packet is determined using a function that decreases.   In the case of using the first transmission frequency determination method, the response transmission frequency determination means first multiplies the value obtained by dividing the target transmission speed by the current transmission speed by the first constant power or the first constant, and then 4. The speed-up device for received traffic according to claim 2, wherein a transmission frequency of the response packet is determined using a value obtained by subtracting a constant of 2.   When the second transmission frequency determination method is used, the response transmission frequency determination unit determines the transmission frequency of the response packet using a function that decreases the transmission frequency of the response packet as the current transmission speed increases. The apparatus for accelerating reception traffic according to any one of claims 2 to 4.   The response transmission frequency determination means determines that the first transmission frequency determination method is used when the current transmission speed is smaller than a value obtained by multiplying the target transmission speed by a third constant, and otherwise 6. The apparatus for accelerating received traffic according to claim 2, wherein the second transmission frequency determining method is determined to be used. When the protocol used for communication between the data transmission device and the data reception device is TCP (Transmission Control Protocol),
Based on the reception status of the data packet and the current transmission speed, further comprising a transmission control state estimation means for estimating whether the congestion control state in the data transmission device is slow start or congestion avoidance,
The response transmission frequency determination means determines that the first transmission frequency determination method is used when the transmission control state estimation means estimates that the congestion control state is a slow start, and is congestion avoidance. The apparatus for accelerating received traffic according to any one of claims 2 to 5, wherein when it is estimated, the second transmission frequency determination method is determined to be used. Applied to a relay server installed between the data transmitting device and the data receiving device;
The target transmission rate estimation means estimates a first available bandwidth in a network between the data transmission device and the relay server based on a reception state of a data packet from the data transmission device, and receives the data reception A second available bandwidth in the network between the relay server and the data receiving device is estimated based on the reception status of the response packet from the device or the rate of change in the amount of data remaining in the relay server. The received traffic speed-up device according to claim 1, wherein the target transmission rate is estimated based on the first available bandwidth and the second available bandwidth. A method for speeding up received traffic used in a data receiving apparatus that returns a response packet to a data packet received from a data transmitting apparatus,
Estimate the available bandwidth of the network based on the reception result of the data packet, estimate the target transmission speed based on the estimated available bandwidth,
Based on the reception result of the data packet, estimate the current transmission rate at which the data transmission device sends the data packet,
A method for speeding up received traffic, wherein a transmission frequency of response packets is determined based on the estimated target transmission rate and the estimated current transmission rate so that the current transmission rate approaches the target transmission rate. A speed-up program for reception traffic used in a data reception apparatus that returns a response packet to a data packet received from a data transmission apparatus,
On the computer,
A target transmission rate estimation process for estimating the available bandwidth of the network based on the reception result of the data packet and estimating the target transmission rate based on the estimated available bandwidth;
Based on the reception result of the data packet, a current transmission rate estimation process for estimating a current transmission rate at which the data transmission device transmits the data packet;
Based on the estimated target transmission rate and the estimated current transmission rate, a response transmission frequency determination process is performed to determine a transmission frequency of response packets so that the current transmission rate approaches the target transmission rate. Receive traffic acceleration program.

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