JP6544353B2 - Transmission data amount control device, control system, control method and control program - Google Patents

Description

  The present invention relates to network technology, and more particularly to network technology for transmitting and receiving data packets using TCP (Transmission Control Protocol).

  In recent years, along with the increase in the line capacity of the Internet and the development of communication technology for handling various media information, information distribution by rich media has come to be enjoyed from mobile terminals anytime and anywhere. Such lifestyles are widely used, and mobile communication technologies such as Long Term Evolution (LTE) and LTE-A (LTE Advanced) are spreading as high-speed mobile environments supporting information distribution.

  In a high-speed mobile communication environment such as LTE, a large capacity buffer is provided in an LTE radio base station such as eNodeB to absorb the influence of band fluctuation in the radio section. Also, if a bit error occurs in the wireless section, retransmission is performed in the lower layer by ARQ (Automatic Repeat reQuest) technology in RLC (Radio Link Control) layer or HARQ (Hybrid ARQ) technology in MAC (Media Access Control) layer. To restore the data. For this reason, in the layer above the network layer, packet corruption is hardly occurring.

  On the other hand, TCP, which is a transport layer protocol widely used in both wired and wireless data communications, is a loss-based TCP that determines that congestion has occurred when packet loss is detected, and reduces the transmission rate. There are many methods for performing congestion control. This method is represented by CUBIC TCP (Non-Patent Document 1) and TCP New Reno (Non-Patent Document 2). As described above, in mobile communication in recent years, packet corruption due to bit errors is less likely to occur. Therefore, in TCP using loss based congestion control, the congestion window size (cwnd) continues to increase until the large capacity buffer overflows and packet loss occurs. If a packet loss occurs after the amount of cwnd becomes large, the amount of packets that can be continuously transmitted after the retransmission of the lost packet decreases, so the transmission of packets may stop. If packet transmission is stopped due to packet loss, a decrease in TCP throughput and interruption of reproduction of streaming content such as video and audio occur, resulting in the disadvantage that the user's quality of sensation is significantly impaired.

  In order to solve the above-mentioned problems, improvement measures such as Patent Document 1 have been taken. Patent Document 1 is a technology in which a relay device is installed in the middle of a network, and the parameters of TCP are changed according to the network type (a wired network, a wireless network, etc.) before and after the relay device. The parameters of TCP exemplified in Patent Document 1 are the maximum value, minimum value, and initial window size of Retransmission Time Out (RTO). It is also possible to apply these to other TCP parameters related to the amount of transmitted packets, such as the size of the transmission buffer, for example. By setting TCP parameters related to the amount of transmission packets according to the network type according to the present technology, it is possible to limit the amount of transmission packets in an LTE network or the like to reduce stoppages of packet transmission and improve the quality of user experience. Can. Related techniques are disclosed in Patent Document 2, Patent Document 3, and Patent Document 4.

JP, 2013-229834, A International Publication No. 2011/052079 JP, 2013/191931, A JP, 2008/78966, A

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. S. Floyd and T. Henderson, 'The New Reno Modification to TCP's Fast Recovery Algorithm', RFC 2582, Apr. 1999.

  However, since patent document 1 can set only the same parameter in the network of the same type, it has the subject that restriction | limiting of the amount of transmission packets can not be performed flexibly. For example, when different network operators operate even with the same network type, the buffer capacity of the radio base station may be different. In addition, in the transition period of the facility expansion and the like, there is a possibility that network facilities having different capacity of the buffer coexist. Also, even if the capacity of the buffer is the same, the buffer may overflow early due to the influence of cross traffic or the like. Just setting the parameters according to the network type as in Patent Document 1 can not cope with the above case, and packet transmission stoppage still occurs, resulting in the disadvantage that the quality of the user's sensation is impaired.

  Further, Patent Document 2 discloses a method of converting numerical values relating to the communication speed limitation in the gateway apparatus so as to make the communication speeds between different networks uniform. However, it has not been possible to limit the congestion window size according to the state of the network and appropriately control the amount of sent packets to suppress the stop of sending packets.

  The present invention has been made in view of the above problems, and its object is to control the amount of packets to be sent appropriately and to suppress the suspension of packet transmission, in accordance with the network conditions such as the transmission buffer capacity. To realize a network that improves the quality of experience of

  The transmission data amount control apparatus according to the present invention sets the upper limit value of the simultaneous transmission data amount based on the information based on the acknowledgment packet, the data packet amount, and the simultaneous transmission data amount history in transmission and reception of data packets using TCP. And transmission data amount limiting means for outputting a control signal for limiting the simultaneous transmission data amount based on the upper limit value.

  The transmission data amount control system according to the present invention sets the upper limit value of the simultaneous transmission data amount based on information based on the acknowledgment packet, the data packet amount, and the simultaneous transmission data amount history in transmission and reception of data packets using TCP. Transmission data amount control apparatus comprising: transmission upper limit data amount calculating means; and transmission data amount limiting means for outputting a control signal for limiting the simultaneous transmission data amount based on the upper limit value; And a data transmitting device for transmitting the data packet in a signal-based amount and supplying the data packet to the transmission data amount control device.

  The transmission data amount control method according to the present invention sets the upper limit value of the simultaneous transmission data amount based on information based on the acknowledgment packet, the data packet amount, and the simultaneous transmission data amount history in transmission and reception of data packets using TCP. And limit the simultaneous transmission data amount based on the upper limit value.

  The transmission data amount control program according to the present invention sets the upper limit value of the simultaneous transmission data amount based on information based on the acknowledgment packet, the data packet amount, and the simultaneous transmission data amount history in transmission and reception of data packets using TCP. And a process of limiting the simultaneous transmission data amount based on the upper limit value.

  According to the present invention, it is possible to realize a network in which the amount of packets to be sent out is appropriately controlled according to the conditions of the network such as the transmission buffer capacity to suppress the stop of packet sending and improve the quality of user experience.

It is a block diagram which shows the structure of the transmission data amount control apparatus of the 1st Embodiment of this invention. It is a block diagram which shows the structure of the transmission data amount control system of the 2nd Embodiment of this invention. It is a flowchart which shows operation | movement of the transmission data amount control system of the 2nd Embodiment of this invention. It is a block diagram which shows the structure of the transmission data amount control system of the 3rd Embodiment of this invention. It is a flowchart which shows operation | movement of the transmission data amount control system of the 3rd Embodiment of this invention. It is a block diagram which shows the structure of the transmission data amount control system of the 4th Embodiment of this invention. It is a flowchart which shows operation | movement of the transmission data amount control system of the 4th Embodiment of this invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. However, the embodiments described below are technically preferable limitations for carrying out the present invention, but the scope of the invention is not limited to the following.
First Embodiment
FIG. 1 is a block diagram showing the configuration of a transmission data amount control apparatus according to the first embodiment of this invention. The transmission data amount control device 1 according to the present embodiment is an upper limit value of the simultaneous transmission data amount based on information based on the acknowledgment packet, the data packet amount, and the simultaneous transmission data amount history in transmission and reception of data packets using TCP. Transmission upper limit data amount calculating means 2 for setting. Further, it has transmission data amount limiting means 3 for outputting a control signal for limiting the simultaneous transmission data amount based on the upper limit value.

According to the present embodiment, it is possible to realize a network that improves the user's quality of experience by controlling the amount of packets to be sent appropriately and suppressing the stop of packet transmission according to the network conditions such as the transmission buffer capacity. .
Second Embodiment
A second embodiment of the present invention will be described with reference to the drawings.
[Description of configuration]
FIG. 2 is a block diagram showing the configuration of a transmission data amount control system according to the second embodiment of this invention. The transmission data amount control system 4 of this embodiment has a data transmission device 10a, a data reception device 20a, and a network 30a.

  The data transmission device 10a can be an origin server that holds data requested by the user of the data reception device 20a. Further, it may be a relay server apparatus installed in the network 30a, such as a cache server, proxy server, edge server, etc., and terminating data communication between the origin server and the data receiving apparatus 20a once. The data transmission device 10a establishes a connection such as TCP to the data reception device 20a, and transmits the data requested from the data reception device 20a to the data reception device 20a.

  The data receiving apparatus 20a is an apparatus such as a PC (Personal Computer) or a portable terminal, in which a user requests and acquires data from the data transmitting apparatus 10a via the network 30a.

  The network 30a performs data communication by connecting the data transmission device 10a and the data reception device 20a.

  As described above, the data transmission device 10a may be disposed in the middle of the route as a relay server device when the origin server transmits data to the data reception device 20a. In that case, the origin server, another network connecting the origin server, and the like may be provided behind the data transmission device 10a as viewed from the data reception device 20a.

  The data transmission apparatus 10 a has data transmission / reception means 11, transmission rate control means 12, transmission upper limit data amount calculation means 13, and transmission data amount restriction means 14. The data reception device 20 a has data transmission / reception means 21.

  Based on the transmission rate determined by the transmission rate control means 12, the data transmission / reception means 11 transmits data packets and ACKs (ACKnowledgement, etc.) toward the data transmission / reception means 21 of the data reception device 20a via the network 30a. Acknowledgement) Receive packets.

  The transmission rate control means 12 controls the simultaneous transmission amount of data packets based on the information of the ACK packet received by the data transmission / reception means 11 and the restriction of the simultaneous transmission data amount controlled by the transmission data amount restriction means 14.

  The transmission upper limit data amount calculation means 13 performs simultaneous transmission based on the information of the ACK packet received by the data transmission / reception means 11, the amount of transmitted data packets, the history of the simultaneous transmission data amount determined by the transmission rate control means 12, etc. Set the upper limit of data volume.

  The transmission data amount restriction unit 14 restricts the simultaneous transmission data amount determined by the transmission rate control unit 12 based on the upper limit value of the simultaneous transmission data amount determined by the transmission upper limit data amount calculation unit 13.

  The data transmission / reception means 21 transmits a data request, receives a data packet, and transmits an ACK packet toward the data transmission apparatus 10a via the network 30a.

  The data transmission / reception unit 11 transmits / receives a packet of requested data according to the simultaneous transmission data amount set by the transmission rate control unit 12 when acquiring the data request message from the data transmission / reception unit 21 of the data reception device 20a. Send to 21 Here, when the data transmission apparatus 10a is an origin server, the data transmission / reception unit 11 can transmit data according to the set simultaneous transmission data amount because all the original data is held by itself.

  When the data transmission device 10a is a relay server device, the original data is copied in advance to its own storage area as a cache, or a data stream transmitted from the origin server is temporarily stored as a buffer. Thus, the data transmission / reception means 11 can transmit data in accordance with the set simultaneous transmission data amount regardless of the throughput of the network between the origin server and the data transmission apparatus 10a.

  Furthermore, when receiving an ACK packet corresponding to the data packet from the data transmission / reception unit 21, the data transmission / reception unit 11 acquires the next information from the ACK packet. That is, round trip time (RTT) of communication between the data transmission apparatus 10a and the data reception apparatus 20a, receive window size (Receive WINdow size, RWIN), duplicate ACK indicating the degree of congestion in communication or the like , Retransmission timeout time exceeded, and messages such as Explicit Congestion Notification (ECN). The data transmission / reception means 11 notifies the transmission rate control means 12 of such information. The method of acquiring and notifying the information may be similar to the known TCP method.

  The transmission rate control means 12 controls the simultaneous transmission amount of data packets to be transmitted to the data receiving apparatus 20a via the network 30a. This control is simultaneous transmission determined by the transmission data amount limiting means 14 with information obtained from the ACK packet received by the data sending / receiving means 11 when the data sending / receiving means 11 receives an ACK packet, or at fixed time intervals. It is performed based on the limitation of data volume. Here, the information obtained from the ACK packet is, for example, an RTT, an RWIN, a duplicate ACK, a retransmission timeout time exceeded, or an ECN message. Further, the present invention is not limited to the above information, and may be other information that can be used by known TCP.

  Here, the control method of the simultaneous transmission amount of data packets is obtained by adding the restriction on the simultaneous transmission data amount determined by the transmission data amount restriction means 14 to the control of the known TCP. Known TCP control includes congestion control for avoiding network congestion and flow control for avoiding memory overflow of the data receiving apparatus 20a.

  Congestion control increases or decreases cwnd managed by the data transmission apparatus 10a. Methods of increase and decrease are, for example, CUBIC TCP (Non-Patent Document 1) and TCP New Reno (Non-Patent Document 2). Further, the present invention is not limited to the increase / decrease method, and may be the same increase / decrease method as other known TCP congestion control methods. In addition, the flow control limits the simultaneous transmission amount of data packets so as not to exceed the RWIN notified from the data receiving apparatus 20a. Further, the limitation of the simultaneous transmission data amount reads a parameter described later determined by the transmission data amount limiting means 14 and limits the simultaneous transmission amount of data packets so as not to exceed this parameter. As a result, the transmission rate control means 12 can transmit an amount of data packets that does not exceed cwnd, RWIN, and the above parameters without waiting for the arrival of an ACK packet.

  The transmission upper limit data amount calculation means 13 sets the upper limit value of the simultaneous transmission data amount. This setting is performed when the data transmitting / receiving unit 11 receives an ACK packet, or at fixed time intervals, information of the ACK packet received by the data transmitting / receiving unit 11, the amount of data packet transmitted, the transmission rate control unit 12 Based on the history of the simultaneous transmission data amount determined by Here, in setting the upper limit value, for example, cwnd when packet loss is detected in the past, or a statistical value of the history of unACKed data amount in_flight during communication with the network 30a may be set as the upper limit value. it can. The statistical value can be determined by either the exponential moving average of the history, or the maximum value in a fixed past time, or the value excluding outliers by a known method. Moreover, in order to suppress a packet loss, you may set the value which reduced only several packets from the said statistical value as an upper limit.

  Moreover, the following method may be used without being limited to the setting method. That is, when the RTT measured or calculated by the data transmitting / receiving unit 11 is monitored, and the average value of the RTT or the index moving average value increases more than the threshold value set in advance than the minimum value of the RTT, the RTT and the throughput at that time The upper limit value may be set to a value obtained by integrating. Further, a value obtained by integrating a preset constant α of 0.5 or more and 1.0 or less with the value of RWIN described in the ACK packet received by the data transmission / reception means 11 may be set as the upper limit value. Also, after the packet loss, the data transmission / reception unit 11 monitors the time for which the packet transmission is stopped, calculates a variable β of 0.5 or more and 1.0 or less, which decreases as the stop time becomes longer, and instead of the constant α. A value obtained by integrating the variable β into RWIN may be set as the upper limit value. Further, among the values calculated by the one or more setting methods, the maximum value or the minimum value may be set as the upper limit value.

  When the transmission upper limit data amount calculation means 13 sets the upper limit value of the simultaneous transmission data amount, the transmission data amount restriction means 14 restricts the simultaneous transmission data amount determined by the transmission rate control means 12 based on the upper limit value. give. Here, a method of giving a restriction is, for example, a method of newly providing a maximum value to cwnd to be increased or decreased by congestion control of TCP, and setting an upper limit value to this maximum value. Also, the method is not limited to the above method, and for example, a method of setting an upper limit value as an optional transmission buffer size of a communication socket may be used, or a method of setting an upper limit value as a transmission memory size of a kernel variable of the data transmission device 10a. It may be

  The data receiving apparatus 20a includes data transmitting / receiving means 21 for transmitting a data request, receiving a data packet, and transmitting an ACK packet toward the data transmitting apparatus 10a via the network 30a. Then, when the data requested by the data transmission apparatus 10a or the origin server is distributed, the data is presented to the user.

The data transmission / reception means 21 transmits a data request to the data transmission apparatus 10a or the origin server via the network 30a when a user requests a data acquisition. When a data packet is received from the data transmission / reception means 11 of the data transmission device 10 a, an ACK packet corresponding to the data packet is transmitted to the data transmission / reception means 11. Here, the ACK packet may be similar to an ACK packet transmitted by known TCP.
[Description of operation]
Next, the operation of the transmission data amount control system of the present embodiment will be described in detail with reference to FIGS. 2 and 3. FIG. 3 is a flowchart showing the operation of the transmission data amount control system 4 of the present embodiment.

  (Step S 11) When the data transmission / reception unit 11 acquires a data request message from the data transmission / reception unit 21, the data transmission / reception unit 21 receives a packet of requested data according to the simultaneous transmission data amount set by the transmission rate control unit 12. Send to

  (Step S12) When receiving the data packet from the data transmission / reception unit 11, the data transmission / reception unit 21 transmits an ACK packet corresponding to the data packet to the data transmission / reception unit 11.

  (Step S13) When the data transmitting / receiving unit 11 receives the ACK packet from the data transmitting / receiving unit 21, the information from the ACK packet, such as RTT, RWIN, duplicate ACK, retransmission timeout time exceeded, ECN message, etc. Are notified to the transmission rate control means 12.

  (Step S14) The transmission upper limit data amount calculation means 13 sets the upper limit value of the simultaneous transmission data amount when the data transmission / reception means 11 receives an ACK packet, or at regular intervals. The transmission upper limit data amount calculation means 13 uses the upper limit value as the information on the ACK packet received by the data transmission / reception means 11, the amount of data packets transmitted, the history of the simultaneous transmission data amount determined by the transmission rate control means 12, etc. Set based on.

  (Step S15) The transmission data amount limiting means 14 performs simultaneous transmission determined by the transmission rate control means 12 based on the upper limit value when the transmission upper limit data amount calculation means 13 determines the upper limit value of the simultaneous transmission data amount. Limit the amount of data.

  (Step S16) The transmission rate control means 12 controls the simultaneous transmission amount of data packets to be transmitted to the data receiving apparatus 20a via the network 30a. The transmission rate control means 12 performs this control based on the information obtained from the ACK packet received by the data transmission / reception means 11 and the restriction on the simultaneous transmission data amount determined by the transmission data amount restriction means 14.

  The transmission data amount control method of this embodiment is a control method that performs the operation described in the configuration and operation of the transmission data amount control system 4 described above. Further, the transmission data amount control program of the present embodiment is a control program for executing the processing of the transmission data amount control method of the present embodiment.

As described above, according to the present embodiment, it is possible to appropriately control the amount of packets to be sent according to the network conditions such as the transmission buffer capacity, to suppress the stop of packet transmission and to improve the quality of experience of the user. It can be realized.
Third Embodiment
A third embodiment of the present invention will be described with reference to the drawings.
[Description of configuration]
FIG. 4 is a block diagram showing the configuration of a transmission data amount control system according to the third embodiment of this invention. The transmission data amount control system 5 of the present embodiment has a data transmission device 10 b, a data reception device 20 b, and a network 30 b. The data transmission device 10 b includes data transmission / reception means 11 and transmission rate control means 12. The data receiving apparatus 20 b includes a data transmitting / receiving unit 21, a transmission upper limit data amount calculating unit 23, and a transmission data amount limiting unit 24.

  The difference between this embodiment and the second embodiment is as follows. That is, in the transmission data amount control system 4 of the second embodiment, the data transmission apparatus 10 a has the transmission upper limit data amount calculation means 13 and the transmission data amount restriction means 14. On the other hand, in the transmission data amount control system 5 of the present embodiment, the data receiving apparatus 20 b includes the transmission upper limit data amount calculation means 23 and the transmission data amount restriction means 24.

  The transmission upper limit data amount calculation means 23 communicates the RTT, cwnd controlled by the transmission rate control means 12 and the inside of the network 30b from the amount of data packets received by the data transmission / reception means 21 and the time interval of reception. The amount of unacknowledged data in_flight etc. during estimation is estimated. Furthermore, based on the estimated value, the upper limit value of the simultaneous transmission data amount is set.

  The transmission data amount restriction unit 24 restricts the simultaneous transmission data amount determined by the transmission rate control unit 12 of the data transmission apparatus 10b based on the upper limit value of the simultaneous transmission data amount determined by the transmission upper limit data amount calculation unit 23. .

  The transmission upper limit data amount calculation means 23 estimates the next value from the amount of data packets and the time interval of reception when the data transmission / reception means 21 receives data packets or at fixed time intervals. That is, RTT, cwnd controlled by the transmission rate control means 12, unACKed data amount in_flight during communication in the network 30b, etc. are estimated. Furthermore, based on the estimated value, the upper limit value of the simultaneous transmission data amount is set.

  Here, for the setting of the upper limit value, for example, the statistical value of the estimated value of cwnd or in_flight can be set as the upper limit value when the duplicate ACK has been transmitted to the data transmitting / receiving means 11 three consecutive times in the past. The statistical value can be determined either by an exponential moving average of the estimated value, or a maximum value in a past fixed time, or a value obtained by removing an outlier by a known method. Also, in order to suppress packet loss, a value obtained by reducing the statistical value by several packets may be set as the upper limit value.

  Further, the present invention is not limited to the setting method described above, and when the average value of the RTT estimated value or the index moving average value increases by a preset threshold or more than the minimum value of the RTT estimated value, the estimated value of RTT at that time A value obtained by integrating the reception speed of the data packet and the data packet may be used as the upper limit value. Further, a value obtained by integrating a constant γ of 1.0 or more set in advance with the estimated value of cwnd or in_flight may be set as the upper limit value. Also, among the values calculated by the one or more setting methods, the maximum value or the minimum value may be set as the upper limit value.

  When the transmission upper limit data amount calculation means 23 sets the upper limit value of the simultaneous transmission data amount, the transmission data amount restriction means 24 simultaneously determines the transmission rate control means 12 of the data transmission apparatus 10b based on the upper limit value. Limit the amount of data sent. The method of giving this limitation is, for example, a method of further providing a maximum value in RWIN to be increased or decreased by the OS (Operating System) of the data receiving apparatus 20b and setting an upper limit value to this maximum value. In addition to the above method, for example, a method of setting an upper limit value as an optional receive buffer size of a communication socket may be used, or a method of setting an upper limit value as a receive memory size of a kernel variable of the data receiving apparatus 20b. It may be

The transmission rate control means 12 acquires information of RWIN via the data transmission / reception means 21 and the data transmission / reception means 11 of the data reception device 20b. Then, based on the information, as in the known TCP, the simultaneous transmission amount of data packets is limited by flow control so as not to exceed RWIN. As a result, the simultaneous transmission amount is limited to the upper limit value determined by the transmission upper limit data amount calculation means 23.
[Description of operation]
Next, the operation of the transmission data amount control system of the present embodiment will be described in detail with reference to FIGS. 4 and 5. FIG. 5 is a flowchart showing the operation of the transmission data amount control system 5 of the present embodiment.

  (Step S21) The transmission upper limit data amount calculation means 23 estimates the next value from the amount of data packets and the time interval of reception when the data transmission / reception means 21 receives a data packet, or at fixed time intervals. . That is, RTT, cwnd controlled by the transmission rate control means 12, unACKed data amount in_flight during communication in the network 30b, and the like are estimated. Furthermore, based on the estimated value, the upper limit value of the simultaneous transmission data amount is set.

  (Step S22) When the transmission upper limit data amount calculation means 23 determines the upper limit value of the simultaneous transmission data amount, the transmission data amount restriction means 24 transmits the transmission rate control means 12 of the data transmission apparatus 10b based on the upper limit value. Limit the amount of simultaneous transmission data determined by

  (Step S23) The transmission rate control unit 12 acquires information of RWIN via the data transmission / reception unit 21 and the data transmission / reception unit 11 of the data reception device 20b. Then, based on the information, as in the known TCP, the simultaneous transmission amount of data packets is limited by flow control so as not to exceed RWIN.

  The transmission data amount control method of this embodiment is a control method that performs the operation described in the configuration and operation of the transmission data amount control system 5 described above. Further, the transmission data amount control program of the present embodiment is a control program for executing the processing of the transmission data amount control method of the present embodiment.

As described above, according to the present embodiment, it is possible to appropriately control the amount of packets to be sent according to the network conditions such as the transmission buffer capacity, to suppress the stop of packet transmission and to improve the quality of experience of the user. It can be realized.
Fourth Embodiment
A fourth embodiment of the present invention will be described with reference to the drawings.
[Description of configuration]
FIG. 6 is a block diagram showing the configuration of a transmission data amount control system according to the fourth embodiment of this invention. The transmission data amount control system 6 of this embodiment has a data transmission device 10c, a data reception device 20c, and a network 30c. The data transmission device 10 c has data transmission / reception means 11 and transmission rate control means 12. The data reception device 20 c has data transmission / reception means 21.

  The difference between this embodiment and the second embodiment is as follows. That is, in the transmission data amount control system 4 of the second embodiment, the data transmission apparatus 10 a has the transmission upper limit data amount calculation means 13 and the transmission data amount restriction means 14. On the other hand, in the transmission data amount control system 6 of the present embodiment, the network device 31 in the network 30 c has the transmission upper limit data amount calculation means 33 and the transmission data amount restriction means 34.

  The transmission data amount control system 6 includes a network device 31 such as an eNodeB, a packet data network gateway (P-GW), a serving gateway (S-GW), or the like in the network 30c.

  The transmission upper limit data amount calculation means 33 is an RTT, cwnd controlled by the transmission rate control means 12 or the most in communication within the network 30c from the amount of data packets passing through the network device 31 and the time interval of passage. The amount of unacknowledged data in in_flight etc. is estimated. Furthermore, based on the estimated value, the upper limit value of the simultaneous transmission data amount is set.

  The transmission data amount restriction unit 34 restricts the simultaneous transmission data amount determined by the transmission rate control unit 12 of the data transmission device 10c based on the upper limit value of the simultaneous transmission data amount determined by the transmission upper limit data amount calculation unit 33. .

  When the data packet passes through the network device 31 or at regular intervals, the transmission upper limit data amount calculation means 33 estimates the following value from the amount of the data packet passed and the time interval of the passage. That is, RTT, cwnd controlled by the transmission rate control means 12, unACKed data amount in_flight during communication in the network 30c, and the like are estimated. Furthermore, based on the estimated value, the upper limit value of the simultaneous transmission data amount is set.

  Here, for the setting of the upper limit value, for example, a statistical value of an estimated value of cwnd or in_flight when a packet loss occurs in the network device 31 can be set as the upper limit value. The statistical value is determined by either an exponential moving average of estimated values, or a maximum value in a past constant time, or a value obtained by removing outliers by a known method. Also, in order to suppress packet loss, a value obtained by reducing the statistical value by several packets may be set as the upper limit value.

  Further, the present invention is not limited to the above, and when the average value of the RTT estimated value or the index moving average value increases by a preset threshold or more than the minimum value of the RTT estimated value, the estimated value of RTT at that time; A value obtained by integrating the passing amount per unit time of the data packet may be set as the upper limit value. In addition, a value obtained by integrating a preset constant α of 0.5 or more and 1.0 or less with the value of RWIN described in the ACK packet passing through the network device 31 may be set as the upper limit value. Also, monitor the time when the passage of the network device 31 of the data packet is stopped after the packet loss is monitored, calculate the variable β of 0.5 or more and 1.0 or less, which decreases as the stop time is longer The upper limit value may be a value obtained by integrating the variable β into RWIN. Further, among the values calculated by the one or more setting methods, the maximum value or the minimum value may be set as the upper limit value.

  When the transmission upper limit data amount calculation means 33 determines the upper limit value of the simultaneous transmission data amount, the transmission data amount restriction means 34 simultaneously determines the transmission rate control means 12 of the data transmission apparatus 10 c based on the upper limit value. Limit the amount of data sent. The method of giving this limitation is, for example, the following method. That is, when the estimated value of in_flight of each communication session or the entire communication session, or the queue amount accumulated in the network device 31 exceeds the upper limit value, a flag is added to the header of the data packet that has passed through the network device 31. . This flag is a CE (Congestion Experienced) flag of the ECN option. Further, the method is not limited to the above method. For example, when the upper limit value is exceeded as described above, the data packet having passed through the network device 31 may be discarded randomly.

The transmission rate control means 12 acquires the message of ECN or the information of the duplicate ACK caused by the packet loss via the data transmission / reception means 21 and the data transmission / reception means 11 of the data reception device 20c. Then, based on the above information, cwnd is controlled by congestion control as in the case of known TCP. As a result, the simultaneous transmission amount of data packets is indirectly limited to the upper limit value determined by the transmission upper limit data amount calculation means 33.
[Description of operation]
Next, the operation of the transmission data amount control system of the present embodiment will be described in detail with reference to FIGS. 6 and 7. FIG. 7 is a flowchart showing the operation of the transmission data amount control system 6 of the present embodiment.

  (Step S31) When the data packet passes through the network device 31, or every fixed time, the transmission upper limit data amount calculation means 33 calculates the next value from the amount of the data packet passed and the time interval of the passage. presume. That is, RTT, cwnd controlled by the transmission rate control means 12, unACKed data amount in_flight during communication in the network 30c, and the like are estimated. Furthermore, based on the estimated value, the upper limit value of the simultaneous transmission data amount is set.

  (Step S32) When the transmission upper limit data amount calculation means 33 determines the upper limit value of the simultaneous transmission data amount, the transmission data amount restriction means 34 transmits the transmission rate control means 12 of the data transmission device 10c based on the upper limit value. Limit the amount of simultaneous transmission data determined by

  (Step S33) The transmission rate control means 12 acquires the message of ECN or the information of the duplicate ACK resulting from the packet loss via the data transmission / reception means 21 and the data transmission / reception means 11 of the data reception device 20c. Then, based on the above information, cwnd is controlled by congestion control as in the case of known TCP.

  The transmission data amount control method of this embodiment is a control method that performs the operation described in the configuration and operation of the transmission data amount control system 6 described above. Further, the transmission data amount control program of the present embodiment is a control program for executing the processing of the transmission data amount control method of the present embodiment.

  As described above, according to the present embodiment, it is possible to appropriately control the amount of packets to be sent according to the network conditions such as the transmission buffer capacity, to suppress the stop of packet transmission and to improve the quality of experience of the user. It can be realized.

The present invention is not limited to the above embodiment, but various modifications are possible within the scope of the invention described in the claims, they are intended to be included within the scope of the present invention.

  Moreover, although a part or all of the above-mentioned embodiment may be described as the following additional notes, it is not limited to the following.

Appendix (Supplementary Note 1)
Transmission upper limit data amount calculating means for setting the upper limit value of the simultaneous transmission data amount based on information based on an acknowledgment packet, data packet amount, and simultaneous transmission data amount history in transmission and reception of data packets using TCP;
A transmission data amount control device, comprising: transmission data amount limiting means for outputting a control signal for limiting the simultaneous transmission data amount based on the upper limit value.
(Supplementary Note 2)
The transmission upper limit data amount calculation means and the transmission data amount restriction means are provided in a data transmission apparatus when performing the transmission and reception.
The transmission upper limit data amount calculation means
Based on the congestion window size when detecting a packet loss, or
Based on the statistics of the amount of unconfirmed data, or
Based on a value obtained by integrating the delay time and the throughput at that time, when the average value or exponential moving average value of the measured or calculated delay time increases by a preset threshold value or more than the minimum value of the delay time. Or
Based on the reception window size described in the acknowledgment packet received by the data transmission apparatus, and the time when transmission of data packets from the data transmission apparatus is stopped after detection of the packet loss,
The transmission data amount control device according to appendix 1, wherein the upper limit value is set.
(Supplementary Note 3)
The transmission data amount limiting means is based on the upper limit value.
By setting the maximum value for the congestion window size and changing the maximum value, or
By changing the send buffer size of the socket option or the send memory size of the kernel variable of the data sending device,
The transmission data amount control device according to appendix 2, wherein the simultaneous transmission data amount is limited.
(Supplementary Note 4)
The transmission upper limit data amount calculation means and the transmission data amount restriction means are provided in a data receiving apparatus at the time of performing the transmission and reception.
The transmission upper limit data amount calculation means
Based on statistics of estimated values of congestion window size or amount of unacknowledged data when detecting packet loss, or
When the estimated delay time average value or the exponential moving average value increases by a preset threshold value or more beyond the minimum value of the delay time, the delay time at that point and the data packet in the data receiving apparatus Based on the value obtained by integrating the received amount per unit time,
The transmission data amount control device according to appendix 1, wherein the upper limit value is set.
(Supplementary Note 5)
The transmission data amount limiting means is based on the upper limit value.
By setting the reception window size to the maximum value and changing the maximum value, or
By changing the receive buffer size of the socket option or the receive memory size of the kernel variable of the data receiver,
The transmission data amount control device according to claim 4, wherein the simultaneous transmission data amount is limited.
(Supplementary Note 6)
The transmission upper limit data amount calculation means and the transmission data amount restriction means are provided in a network device of a network that performs the transmission and reception.
The transmission upper limit data amount calculation means
Based on statistics of estimated values of congestion window size or confirmation unacknowledged data amount when the network device discards data packets, or
When the estimated delay time average value or exponential moving average value increases by more than a preset threshold value over the minimum delay time value, the delay time at that point and the data packet in the network device per unit time Based on the value obtained by integrating the passing amount of
Based on the reception window size described in the acknowledgment packet passing through the network device, and the time when the passage of the data packet is stopped after the network device discards the data packet.
The transmission data amount control device according to appendix 1, wherein the upper limit value is set.
(Appendix 7)
The transmission data amount limiting means is based on the upper limit value.
By changing the queue amount to which the congestion detection flag of explicit congestion notification is given, or
By randomly discarding data packets passing through the network device when the upper limit value is exceeded,
The transmission data amount control device according to claim 6, wherein the simultaneous transmission data amount is limited.
(Supplementary Note 8)
The transmission data amount control device according to any one of supplementary notes 1 to 7,
A transmission data amount control system comprising: a data transmission device for transmitting the data packet of an amount based on the input control signal and supplying the data packet to the transmission data amount control device.
(Appendix 9)
The transmission upper limit data amount control device is included in the data transmission device.
The transmission upper limit data amount calculation means
Based on the congestion window size when detecting a packet loss, or
Based on the statistics of the amount of unconfirmed data, or
Based on a value obtained by integrating the delay time and the throughput at that time, when the average value or exponential moving average value of the measured or calculated delay time increases by a preset threshold value or more than the minimum value of the delay time. Or
Based on the reception window size described in the acknowledgment packet received by the data transmission apparatus, and the time when transmission of data packets from the data transmission apparatus is stopped after detection of the packet loss,
The transmission data amount control system according to appendix 8, wherein the upper limit value is set.
(Supplementary Note 10)
The transmission data amount limiting means is based on the upper limit value.
By setting the maximum value for the congestion window size and changing the maximum value, or
By changing the send buffer size of the socket option or the send memory size of the kernel variable of the data sending device,
The transmission data amount control system according to appendix 9, wherein the simultaneous transmission data amount is limited.
(Supplementary Note 11)
The transmission upper limit data amount control device is included in a data receiving device at the time of performing the transmission and reception.
The transmission upper limit data amount calculation means
Based on statistics of estimated values of congestion window size or amount of unacknowledged data when detecting packet loss, or
When the estimated delay time average value or the exponential moving average value increases by a preset threshold value or more beyond the minimum value of the delay time, the delay time at that point and the data packet in the data receiving apparatus Based on the value obtained by integrating the received amount per unit time,
The transmission data amount control system according to appendix 8, wherein the upper limit value is set.
(Supplementary Note 12)
The transmission data amount limiting means is based on the upper limit value.
By setting the reception window size to the maximum value and changing the maximum value, or
By changing the receive buffer size of the socket option or the receive memory size of the kernel variable of the data receiver,
The transmission data amount control system according to appendix 11, wherein the simultaneous transmission data amount is limited.
(Supplementary Note 13)
The transmission upper limit data amount control device is provided in a network device included in the network that performs the transmission and reception.
The transmission upper limit data amount calculation means
Based on statistics of estimated values of congestion window size or confirmation unacknowledged data amount when the network device discards data packets, or
When the estimated delay time average value or exponential moving average value increases by more than a preset threshold value over the minimum delay time value, the delay time at that point and the data packet in the network device per unit time Based on the value obtained by integrating the passing amount of
Based on the reception window size described in the acknowledgment packet passing through the network device, and the time when the passage of the data packet is stopped after the network device discards the data packet.
The transmission data amount control system according to appendix 8, wherein the upper limit value is set.
(Supplementary Note 14)
The transmission data amount limiting means is based on the upper limit value.
By changing the queue amount to which the congestion detection flag of explicit congestion notification is given, or
By randomly discarding data packets passing through the network device when the upper limit value is exceeded,
The transmission data amount control system according to appendix 13, wherein the simultaneous transmission data amount is limited.
(Supplementary Note 15)
The upper limit value of the simultaneous transmission data amount is set based on information based on the acknowledgment response packet, the data packet amount, and the simultaneous transmission data amount history in transmission and reception of data packets using TCP,
A transmission data amount control method, wherein the simultaneous transmission data amount is limited based on the upper limit value.
(Supplementary Note 16)
Based on the congestion window size when detecting a packet loss, or
Based on the statistics of the amount of unconfirmed data, or
Based on a value obtained by integrating the delay time and the throughput at that time, when the average value or exponential moving average value of the measured or calculated delay time increases by a preset threshold value or more than the minimum value of the delay time. Or
Based on the reception window size described in the acknowledgment packet received by the data transmission device when performing the transmission and reception, and the time when transmission of the data packet from the data transmission device is stopped after detection of the packet loss,
The transmission data amount control method according to appendix 15, wherein the upper limit value is set.
(Supplementary Note 17)
Based on the upper limit value,
By setting the maximum value for the congestion window size and changing the maximum value, or
By changing the send buffer size of the socket option or the send memory size of the kernel variable of the data sending device,
The transmission data amount control method according to appendix 16, wherein the simultaneous transmission data amount is limited.
(Appendix 18)
Based on statistics of estimated values of congestion window size or amount of unacknowledged data when detecting packet loss, or
When the estimated delay time average value or exponential moving average value increases by more than a preset threshold value or more than the delay time minimum value, the delay time at that point and data reception at the time of transmission / reception are performed Based on the value obtained by integrating the amount of data packets received per unit time in the device,
The transmission data amount control method according to appendix 15, wherein the upper limit value is set.
(Appendix 19)
Based on the upper limit value,
By setting the reception window size to the maximum value and changing the maximum value, or
By changing the receive buffer size of the socket option or the receive memory size of the kernel variable of the data receiver,
The transmission data amount control method according to appendix 18, wherein the simultaneous transmission data amount is limited.
(Supplementary Note 20)
Based on the statistical value of the estimated value of the congestion window size when the network equipment of the network performing the transmission / reception discards a data packet, or the amount of acknowledgment unacknowledged data, or
When the estimated delay time average value or exponential moving average value increases by more than a preset threshold value over the minimum delay time value, the delay time at that point and the data packet in the network device per unit time Based on the value obtained by integrating the passing amount of
Based on the reception window size described in the acknowledgment packet passing through the network device, and the time when the passage of the data packet is stopped after the network device discards the data packet.
The transmission data amount control method according to appendix 15, wherein the upper limit value is set.
(Supplementary Note 21)
Based on the upper limit value,
By changing the queue amount to which the congestion detection flag of explicit congestion notification is given, or
By randomly discarding data packets passing through the network device when the upper limit value is exceeded,
24. The transmission data amount control method according to appendix 20, wherein the simultaneous transmission data amount is limited.
(Supplementary Note 22)
A process of setting the upper limit value of the simultaneous transmission data amount based on information based on an acknowledgment packet, data packet amount, and simultaneous transmission data amount history in transmission and reception of data packets using TCP;
A transmission data amount control program for executing the process of limiting the simultaneous transmission data amount based on the upper limit value.
(Supplementary Note 23)
Based on the congestion window size when detecting a packet loss, or
Based on the statistics of the amount of unconfirmed data, or
Based on a value obtained by integrating the delay time and the throughput at that time, when the average value or exponential moving average value of the measured or calculated delay time increases by a preset threshold value or more than the minimum value of the delay time. Or
Based on the reception window size described in the acknowledgment packet received by the data transmission device when performing the transmission and reception, and the time when transmission of the data packet from the data transmission device is stopped after detection of the packet loss,
24. A transmission data amount control program as set forth in claim 22, which executes the process of setting the upper limit value.
(Supplementary Note 24)
Based on the upper limit value,
By setting the maximum value for the congestion window size and changing the maximum value, or
By changing the send buffer size of the socket option or the send memory size of the kernel variable of the data sending device,
24. The transmission data amount control program according to appendix 23, wherein the process of limiting the simultaneous transmission data amount is executed.
(Appendix 25)
Based on statistics of estimated values of congestion window size or amount of unacknowledged data when detecting packet loss, or
When the estimated delay time average value or exponential moving average value increases by more than a preset threshold value or more than the delay time minimum value, the delay time at that point and data reception at the time of transmission / reception are performed Based on the value obtained by integrating the amount of data packets received per unit time in the device,
24. A transmission data amount control program as set forth in claim 22, which executes the process of setting the upper limit value.
(Appendix 26)
Based on the upper limit value,
By setting the reception window size to the maximum value and changing the maximum value, or
By changing the receive buffer size of the socket option or the receive memory size of the kernel variable of the data receiver,
25. The transmission data amount control program as set forth in appendix 25, wherein the process of limiting the simultaneous transmission data amount is executed.
(Appendix 27)
Based on the statistical value of the estimated value of the congestion window size when the network equipment of the network performing the transmission / reception discards a data packet, or the amount of acknowledgment unacknowledged data, or
When the estimated delay time average value or exponential moving average value increases by more than a preset threshold value over the minimum delay time value, the delay time at that point and the data packet in the network device per unit time Based on the value obtained by integrating the passing amount of
Based on the reception window size described in the acknowledgment packet passing through the network device, and the time when the passage of the data packet is stopped after the network device discards the data packet.
The transmission data amount control program as set forth in claim 22, wherein the upper limit value is set.
(Appendix 28)
Based on the upper limit value,
By changing the queue amount to which the congestion detection flag of explicit congestion notification is given, or
By randomly discarding data packets passing through the network device when the upper limit value is exceeded,
27. The transmission data amount control program as set forth in appendix 27, wherein the process of limiting the simultaneous transmission data amount is executed.

  This application claims priority based on Japanese Patent Application No. 2014-117175 filed on Jun. 6, 2014, the entire disclosure of which is incorporated herein.

  The present invention is applicable to a communication technology for transmitting and receiving data packets using TCP.

DESCRIPTION OF SYMBOLS 1 Transmission data amount control apparatus 2, 13, 23, 33 Transmission upper limit data amount calculation means 3, 14, 24, 34 Transmission data amount restriction means 4, 5, 6 Transmission data amount control system 10, 10a, 10b, 10c Data transmission Apparatus 20, 20a, 20b, 20c Data receiving apparatus 30, 30a, 30b, 30c Network 11, 21 Data transmission / reception means 12 Transmission rate control means 31 Network device

Claims (13)

Transmission upper limit data amount calculating means for setting the upper limit value of the simultaneous transmission data amount based on information based on an acknowledgment packet, data packet amount, and simultaneous transmission data amount history in transmission and reception of data packets using TCP;
Based on the upper limit, have a, a transmission data amount limiting means for outputting a control signal for limiting the simultaneous transmission data amount,
The transmission upper limit data amount calculation means and the transmission data amount restriction means are included in a data transmission apparatus that performs the transmission and reception.
The transmission upper limit data amount calculation means
Based on the congestion window size when detecting a packet loss, or
Based on the statistics of the amount of unconfirmed data, or
Based on a value obtained by integrating the delay time and the throughput at that time, when the average value or exponential moving average value of the measured or calculated delay time increases by a preset threshold value or more than the minimum value of the delay time. Or
The upper limit value is set based on the reception window size described in the acknowledgment packet received by the data transmission apparatus and the time when transmission of data packets from the data transmission apparatus is stopped after detection of the packet loss. The transmission data amount control device. The transmission data amount limiting means is based on the upper limit value.
By setting the maximum value for the congestion window size and changing the maximum value, or
By changing the send buffer size of the socket option or the send memory size of the kernel variable of the data sending device,
Limiting the simultaneous transmission data amount, the transmission data amount control device according to claim 1. Transmission upper limit data amount calculating means for setting the upper limit value of the simultaneous transmission data amount based on information based on an acknowledgment packet, data packet amount, and simultaneous transmission data amount history in transmission and reception of data packets using TCP;
Transmission data amount limiting means for outputting a control signal for limiting the simultaneous transmission data amount based on the upper limit value;
Wherein the transmitting upper data amount calculating means and the transmission data amount limiting means are provided the transmitting and receiving in a row arm over data receiving device,
The transmission upper limit data amount calculation means
Based on statistics of estimated values of congestion window size or amount of unacknowledged data when detecting packet loss, or
When the estimated delay time average value or the exponential moving average value increases by a preset threshold value or more beyond the minimum value of the delay time, the delay time at that point and the data packet in the data receiving apparatus Based on the value obtained by integrating the received amount per unit time,
To set the upper limit value, the transmit data amount control device. The transmission data amount limiting means is based on the upper limit value.
By setting the reception window size to the maximum value and changing the maximum value, or
By changing the receive buffer size of the socket option or the receive memory size of the kernel variable of the data receiver,
The transmission data amount control device according to claim 3 , wherein the simultaneous transmission data amount is limited. Transmission upper limit data amount calculating means for setting the upper limit value of the simultaneous transmission data amount based on information based on an acknowledgment packet, data packet amount, and simultaneous transmission data amount history in transmission and reception of data packets using TCP;
Transmission data amount limiting means for outputting a control signal for limiting the simultaneous transmission data amount based on the upper limit value;
The transmission upper limit data amount calculation means and the transmission data amount restriction means are provided in a network device of a network that performs the transmission and reception.
The transmission upper limit data amount calculation means
Based on statistics of estimated values of congestion window size or confirmation unacknowledged data amount when the network device discards data packets, or
When the estimated delay time average value or exponential moving average value increases by more than a preset threshold value over the minimum delay time value, the delay time at that point and the data packet in the network device per unit time Based on the value obtained by integrating the passing amount of
Based on the reception window size described in the acknowledgment packet passing through the network device, and the time when the passage of the data packet is stopped after the network device discards the data packet.
To set the upper limit value, the transmit data amount control device. The transmission data amount limiting means is based on the upper limit value.
By changing the queue amount to which the congestion detection flag of explicit congestion notification is given, or
By randomly discarding data packets passing through the network device when the upper limit value is exceeded,
The transmission data amount control device according to claim 5 , wherein the simultaneous transmission data amount is limited. A transmission data amount control apparatus according to any one of claims 1 to 6 .
A data transmission apparatus for transmitting the data packet in an amount based on the input control signal and supplying the data packet to the transmission data amount control apparatus.
Transmission data amount control system having: Based on information based on the acknowledgment packet, the data packet amount, and the simultaneous transmission data amount history in transmission and reception of data packets using TCP,
Based on the congestion window size when detecting a packet loss, or
Based on the statistics of the amount of unconfirmed data, or
Based on a value obtained by integrating the delay time and the throughput at that time, when the average value or exponential moving average value of the measured or calculated delay time increases by a preset threshold value or more than the minimum value of the delay time. Or
Based on the reception window size described in the acknowledgment packet received by the data transmission apparatus performing the transmission and reception, and the time when transmission of the data packet from the data transmission apparatus is stopped after detection of the packet loss,
Set the upper limit of the simultaneous transmission data amount,
A transmission data amount control method, wherein the simultaneous transmission data amount is limited based on the upper limit value. Based on information based on the acknowledgment packet, the data packet amount, and the simultaneous transmission data amount history in transmission and reception of data packets using TCP,
Based on statistics of estimated values of congestion window size or amount of unacknowledged data when detecting packet loss, or
When the estimated delay time average value or the exponential moving average value increases by at least a preset threshold value over the minimum value of the delay time, the delay time at that point and the data receiving apparatus performing the transmission and reception Based on the value obtained by integrating the amount of data packet received per unit time,
Set the upper limit of the simultaneous transmission data amount,
A transmission data amount control method, wherein the simultaneous transmission data amount is limited based on the upper limit value. Based on information based on the acknowledgment packet, the data packet amount, and the simultaneous transmission data amount history in transmission and reception of data packets using TCP,
Based on the statistical value of the estimated value of the congestion window size when the network equipment of the network performing the transmission / reception discards a data packet, or the amount of acknowledgment unacknowledged data, or
When the estimated delay time average value or exponential moving average value increases by more than a preset threshold value over the minimum delay time value, the delay time at that point and the data packet in the network device per unit time Based on the value obtained by integrating the passing amount of
Based on the reception window size described in the acknowledgment packet passing through the network device, and the time when the passage of the data packet is stopped after the network device discards the data packet.
Set the upper limit of the simultaneous transmission data amount,
A transmission data amount control method, wherein the simultaneous transmission data amount is limited based on the upper limit value. On the computer
A process of setting the upper limit value of the simultaneous transmission data amount based on information based on an acknowledgment packet, data packet amount, and simultaneous transmission data amount history in transmission and reception of data packets using TCP;
Executing the process of limiting the simultaneous transmission data amount based on the upper limit value ;
Based on the congestion window size when detecting a packet loss, or
Based on the statistics of the amount of unconfirmed data, or
Based on a value obtained by integrating the delay time and the throughput at that time, when the average value or exponential moving average value of the measured or calculated delay time increases by a preset threshold value or more than the minimum value of the delay time. Or
Based on the reception window size described in the acknowledgment packet received by the data transmission apparatus performing the transmission and reception, and the time when transmission of the data packet from the data transmission apparatus is stopped after detection of the packet loss,
Transmission data amount control program Ru to execute the process of setting the upper limit value. On the computer
A process of setting the upper limit value of the simultaneous transmission data amount based on information based on an acknowledgment packet, data packet amount, and simultaneous transmission data amount history in transmission and reception of data packets using TCP;
Executing the process of limiting the simultaneous transmission data amount based on the upper limit value;
Based on statistics of estimated values of congestion window size or amount of unacknowledged data when detecting packet loss, or
When the estimated delay time average value or the exponential moving average value increases by at least a preset threshold value over the minimum value of the delay time, the delay time at that point and the data receiving apparatus performing the transmission and reception Based on the value obtained by integrating the amount of data packet received per unit time,
A transmission data amount control program for executing a process of setting the upper limit value. On the computer
A process of setting the upper limit value of the simultaneous transmission data amount based on information based on an acknowledgment packet, data packet amount, and simultaneous transmission data amount history in transmission and reception of data packets using TCP;
Executing the process of limiting the simultaneous transmission data amount based on the upper limit value;
Based on the statistical value of the estimated value of the congestion window size when the network equipment of the network performing the transmission / reception discards a data packet, or the amount of acknowledgment unacknowledged data, or
When the estimated delay time average value or exponential moving average value increases by more than a preset threshold value over the minimum delay time value, the delay time at that point and the data packet in the network device per unit time Based on the value obtained by integrating the passing amount of
Based on the reception window size described in the acknowledgment packet passing through the network device, and the time when the passage of the data packet is stopped after the network device discards the data packet.
A transmission data amount control program for executing a process of setting the upper limit value.

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