WO2013174095A1

WO2013174095A1 - Method and device for controlling data transmission

Info

Publication number: WO2013174095A1
Application number: PCT/CN2012/083197
Authority: WO
Inventors: 扶柏成; 李耀华
Original assignee: 华为技术有限公司
Priority date: 2012-05-23
Filing date: 2012-10-19
Publication date: 2013-11-28
Also published as: CN102694631B; CN102694631A

Abstract

The invention relates to a method and device for controlling data transmission. The device comprises: a judgment module, used for judging whether the data messages, which have been received by receiving equipment from transmitting equipment not in an anticipated sequence, meet the appointed amount condition, when the receiving equipment receives the data messages not in an anticipated sequence from the transmitting equipment; a transmission module, used for sending an affirmation message not including a selective response SACK option to the transmitting equipment when the condition is met, wherein the SACK option carries the information indicating that the receiving equipment has already received the data messages from the transmitting equipment not in an anticipated sequence. According to the method and device provided by the invention, the waste of the system resources is reduced under the condition of not affecting the normal retransmission of the data.

Description

Method and device for controlling data transmission

Technical field

The present invention relates to the field of data transmission, and more particularly to a method and apparatus for controlling data transmission. Background technique

Transmission Control Protocol (TCP) is a connection-oriented, reliable, byte-based transport layer communication protocol.

According to the TCP mechanism, each time after receiving a data message from the sender device, the receiver device sends an acknowledgement message (ACK: Acknowledgment) to the sender device to inform the sender device of the acknowledged data packet. information. The receiving device usually only acknowledges the data packets arriving in the expected order to the sender device. For example, after the receiver device acknowledges the data packet n, the next data packet arriving at the receiver device in the expected order should be the data packet n+1, so if the data packet arriving at the receiver device is a datagram If n+1, the receiving device acknowledges the data packet n+1, and if the data packet arriving at the receiving device is not the data packet n+1 but other data packets that do not arrive in the expected order (for example, If the data message is n+4, n+5 or n+7, etc., the receiver device will not acknowledge the data packets that did not arrive in the expected order. According to the acknowledgement message received from the receiver device, the sender device will re-send the data packet that has been sent but the receiver device has not received the acknowledgement to ensure that the receiver device acknowledges the sender device. All data messages sent.

As can be seen from the above description, although the receiving device does not acknowledge the data message that did not arrive in the expected order, the receiving device has indeed received the data message that did not arrive in the expected order, but the sender device still receives the data message. The party device retransmits the data packets that have been received by the receiver device but are not acknowledged by the receiver device until the receiver device acknowledges the data packets. Obviously, the sender device retransmits the data packet that the receiver device has received to the receiver device, which will waste a lot of network bandwidth and reduce the throughput of data transmission.

In order to overcome the above drawbacks, people have improved the TCP mechanism. According to the improved TCP mechanism, When the receiving device receives the data packet that does not arrive in the expected order, the receiving device sends the acknowledgement packet to the sender device, in addition to the information of the data packet that the receiver device has received, including the receiver. The information of the data message that the device has received but not acknowledged that did not arrive in the expected order, and thus, according to the receiving device received from the receiving device, the receiving device received by the receiving device does not arrive in the expected order. The information of the data packet, the sender device can only retransmit the data packet that has been sent but the receiver device has not received, without wasting network bandwidth and reducing the throughput of the data transmission. An acknowledgment message including information of a data message that has been received by the receiving device that is not in the expected order is generally referred to as a selective acknowledgement message (SACK: Selective Acknowledgment), wherein the receiving device has received the sequence in the expected order. The information of the arriving data message is included in the SACK option included in the SACK.

However, according to the improved TCP mechanism, after the receiver device receives the data message that does not arrive in the expected order, each acknowledgement message sent by the receiver device to the sender device needs to include the SACK option to the sender. The device notifies the recipient device of the information that has not been received in the expected order. However, since the content of the SACK option included in many acknowledgment messages is the same, each acknowledgment message including the SACK option will waste system resources, because this increases the processing load of the sender device, and the SACK option needs to be transmitted. Consume network bandwidth.

To this end, people have made further improvements to the TCP mechanism. According to the further improved TCP mechanism, before the receiver device sends an acknowledgment message containing the SACK option to the sender device, it first determines the SACK option included in the acknowledgment message to be sent and the previously sent acknowledgment message. Whether the included SACK option is the same and the acknowledgment message to be sent does not include additional information, and when the judgment result is negative, the acknowledgment message containing the SACK option to be sent is sent to the sender device, otherwise The sender device sends the acknowledgement message containing the SACK option to be sent. With this further improved TCP mechanism, the transmission of the SACK option is indeed reduced, thereby avoiding waste of system resources.

In the further improved TCP mechanism, the transmission of the SACK option is reduced by reducing the transmission of the acknowledgment message. However, reducing the transmission of the acknowledgment message deteriorates the effect of the fast retransmission congestion control mechanism based on the number of repeated acknowledgment messages, thereby affecting the normal retransmission of data. Summary of the invention

Embodiments of the present invention provide a method and apparatus for controlling data transmission that can Reduce the waste of system resources in the case of normal data retransmission.

A method for controlling data transmission according to an embodiment of the present invention includes the following steps: when a receiving device receives a data message that does not arrive in an expected sequence from a sender device, determining that the recipient device has been Whether the data packet received by the sender device that does not arrive in the expected order satisfies the specified quantity condition; when the judgment result is positive, the acknowledgement message not including the selective response SACK option is sent to the sender device, where The SACK option carries information of data messages that the recipient device has received from the sender device that did not arrive in the expected order.

An apparatus for controlling data transmission according to an embodiment of the present invention includes: a determining module, configured to determine, when a receiving device receives a data message that does not arrive in an expected sequence from a sending device, determine the receiving device Whether the data packet that has been received from the sender device that does not arrive in the expected order satisfies the specified quantity condition; the sending module, configured to send the selective response SACK to the sender device when the determination result is positive An acknowledgment message of the option, wherein the SACK option carries information of a data message that the receiver device has received from the sender device that does not arrive in an expected sequence.

As can be seen from the above description, when the receiving device receives a data message that does not arrive in the expected order from the sender device, the data message that the receiver device has received from the sender device that does not arrive in the expected order satisfies In the case of the specified number of conditions, no information is sent to the sender device regarding the data message that the receiver device has received from the sender device that did not arrive in the expected order, but still sends a normal acknowledgement message that does not include the SACK option. Therefore, compared with the prior art, the solution disclosed by the embodiments of the present invention can reduce the waste of system resources without affecting the normal retransmission of data. DRAWINGS

The features, characteristics, advantages and advantages of the present invention will become more apparent from the detailed description of the appended claims. among them:

1 is a schematic diagram showing a technical solution for controlling data transmission according to an embodiment of the present invention;

2 is a flow chart showing a method for controlling data transmission according to a first embodiment of the present invention; FIG. 3 is a flow chart showing a method for controlling data transmission according to a second embodiment of the present invention; Illustrative apparatus for controlling data transmission in accordance with one embodiment of the present invention Figure

Figure 5 shows a schematic diagram of a communication system in accordance with one embodiment of the present invention;

Figure 6 shows a schematic diagram of a computer system in accordance with one embodiment of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS Hereinafter, various embodiments of the present invention will be described in detail with reference to the accompanying drawings. Referring now to Figure 1, there is shown a schematic diagram of a technical solution for controlling data transmission in accordance with an embodiment of the present invention. As shown in FIG. 1, in step S10, when the receiver device receives a data message that does not arrive in the expected order from the sender device, it determines that the data packet that the receiver device has received from the sender device that does not arrive in the expected order Whether the text satisfies the specified quantity condition.

In step S20, when the determination result of step S10 is YES, an acknowledgement message not including the selective response SACK option is sent to the sender device, where the SACK option carries the receiver device that has received the notification from the sender device. Information about the data packets that arrive in sequence.

Further, optionally, when the determination result is no, the acknowledgement message including the SACK option is sent to the sender device.

It can be seen from the above that, in the technical solution provided by the embodiment of the present invention, when the receiving device receives the data message that does not arrive in the expected order from the sending device, the receiving device has received the received device from the transmitting device. If the data message arriving in the expected order satisfies the specified quantity condition, the receiver device does not send information to the sender device about the data message that the receiver device has received from the sender device and does not arrive in the expected order, but The normal acknowledgement message is still sent, so the waste of system resources is reduced without affecting the normal retransmission of data.

Referring to Figure 2, there is shown a flow chart of a method for controlling data transmission in accordance with a first embodiment of the present invention. As shown in FIG. 2, in step S100, the receiver device R receives a data message D from the sender device S.

In step S102, the recipient device R determines whether the received data message D is a data message that does not arrive in the expected order. In step S104, when the result of the determination in step S100 is negative, that is, the data message D is a data message arriving in the expected order, the receiving device R clears the first count value DJ. Here, the first count value DJ is used to calculate that the receiver device R has continuously received from the sender device S after the selective acknowledgement message including the SACK option is transmitted from the last receiver device R to the sender device S. The number of data packets that arrive in sequence, wherein the SACK option is used to carry information of the data message that the receiver device R has received from the sender device S that did not arrive in the expected order.

At step S108, the recipient device R transmits a normal acknowledgment message that does not include the SACK option to the sender device S. Then, the process ends.

In step S112, when the result of the determination in step S100 is affirmative, that is, the data message D is a data message that does not arrive in the expected order, the receiver device R calculates that the data packet D has been received from the sender device S. The cumulative number of data messages that did not arrive in the expected order.

In step S116, the recipient device R determines whether the calculated cumulative number has not reached the first number threshold FI. Here, the first number threshold FI may be equal to half of the reception window of the recipient device R.

When the decision result in the step S116 is negative, that is, the calculated cumulative number reaches the first number threshold F, the flow proceeds to steps S136 and S140.

In step S120, when the result of the determination in step S116 is affirmative, the receiver device R calculates the sum of the numbers included in all the data messages that have been received from the sender device S and that have not arrived in the expected order, including the data message D. .

At step S124, the recipient device R determines whether the calculated sum has not reached the third number threshold H. Here, the third number threshold H may be equal to the amount of data that can be accommodated by half of the receiving window of the receiving device R.

When the decision result in the step S124 is negative, that is, the calculated sum reaches the third number threshold H, the flow proceeds to steps S136 and S140.

In step S128, when the result of the determination in step S124 is affirmative, that is, the calculated sum does not reach the third number threshold H, the receiving device R increases the first count value DJ by one.

In step S132, the recipient device R determines whether the first count value DJ has not reached the second number threshold SE. Here, the second number threshold SE may be equal to the number of duplicate acknowledgement messages required by the sender device S to trigger the congestion control mechanism. For example, the second number threshold SE may be equal to three.

When the result of the determination in step S132 is negative, that is, the first count value DJ reaches the second number threshold SE, the flow proceeds to steps S136 and S140. At step S136, the recipient device R transmits a selective acknowledgment message including the SACK option to the sender device S.

At step S140, the receiving device R clears the first count value DJ, and then the flow ends. In step S144, when the result of the determination in step S132 is affirmative, that is, the first count value DJ does not reach the second number threshold SE, the receiver device R transmits a normal acknowledgement message not including the SACK option to the sender device S. Referring to Figure 3, there is shown a flow chart of a method for controlling data transmission in accordance with a second embodiment of the present invention. The second embodiment includes the steps S100-S140 and the steps S144-S152. The steps S100-S140 included in the second embodiment are the same as the steps S100-S140 described in the first embodiment. For the sake of simplicity, only steps S144-S152 will be described below, and steps S100-S140 will not be described again.

In step S144, when the result of the determination in step S132 is affirmative, that is, the first count value DJ does not reach the second number threshold SE, the receiver device R calculates that there is a failure to receive from the sender device S in the receiving device R. The time that the expected sequence of data packets has been expected to last.

In step S148, the receiver device R determines whether the calculated time has not reached the first time threshold.

SJ.

When the decision result in the step S148 is negative, that is, the calculated time reaches the first time threshold SJ, the flow proceeds to steps S136 and S140.

In step S152, when the result of the determination in step S152 is affirmative, that is, the calculated time does not reach the first time threshold SJ, the receiving device R transmits a normal acknowledgement message not including the SACK option to the sender device S.

It should be understood by those skilled in the art that, in the first embodiment above, it is first determined whether the cumulative number of data messages that the receiver device R has received from the sender device S that did not arrive in the expected order has not reached the first number threshold FI. And then determining that the recipient device R has received from the sender device S if the cumulative number of data messages that the receiver device R has received from the sender device S that did not arrive in the expected order does not reach the first number threshold FI Whether the sum of the data included in all data messages not arriving in the expected order has not reached the third number threshold H, and finally, all the datagrams that the receiver device R has received from the sender device S that did not arrive in the expected order Included in the text If the sum of the data does not reach the third number threshold H, it is judged that the receiver device R has continuously received from the sender device S after the last receiver device R transmitted the selective acknowledgment message including the SACK option to the sender device S. The number of data messages that did not arrive in the expected order did not reach the second number threshold SE. However, the order of the three judgments of the present invention is not limited thereto. In other embodiments of the present invention, the order of the three determinations may be arbitrarily combined as needed.

It should be understood by those skilled in the art that although in the above first embodiment, when the receiver device R receives a data message that does not arrive in the expected order from the sender device S, the receiver device R has received from the sender device S. In case the received data message not arriving in the expected order satisfies the quantity condition specified below, gP: (A) the cumulative number of data messages that the receiver device R has received from the sender device S that did not arrive in the expected order The first number threshold FI is not reached, (B) the sum of the data included in all data messages that the receiver device R has received from the sender device S that did not arrive in the expected order has not reached the third number threshold H, and ( C) the number of data packets that the receiver device R has continuously received from the sender device S that did not arrive in the expected order since the last time the receiver device R sent the selective acknowledgement message of the SACK option to the sender device S The second number threshold SE, the receiver device R sends a normal acknowledgement message that does not include the SACK option to the sender device S. However, the present invention is not limited. The specified number of conditions includes: The cumulative number of data messages that the receiver device R has received from the sender device S that did not arrive in the expected order did not reach the first number threshold F, and the receiver device R has received from the sender device S The sum of the data included in all received data messages not arriving in the expected order does not reach the third number threshold H, and the selective acknowledgement message including the SACK option is sent from the last receiver device R to the sender device S The number of data messages that the receiver device R has continuously received from the sender device S that did not arrive in the expected order does not reach the second number threshold SE.

In some other embodiments of the present invention, the specified number of conditions may also include, for example, only one or both of the following: accumulation of data messages that the recipient device R has received from the sender device S that did not arrive in the expected order If the number does not reach the first quantity threshold F, the sum of the data included in all data messages that the receiver device R has received from the sender device S that did not arrive in the expected order does not reach the third number threshold H, and since the last time After the receiver device R sends the selective acknowledgment message including the SACK option to the sender device S, the number of data packets that the receiver device R has continuously received from the sender device S that does not arrive in the expected order does not reach the second number threshold. SE.

In some other embodiments of the present invention, the specified quantity condition may also be, for example, or Included: Since the last time the receiver device R sent the selective acknowledgment message including the SACK option to the sender device S, the number of data messages that the receiver device R has received from the sender device S that did not arrive in the expected order reached the predetermined number. Quantity. It should be understood by those skilled in the art that although in the above second embodiment, when the receiver device R receives a data message that does not arrive in the expected order from the sender device S, it is determined that the receiver device R has been from the sender device. When the data message received by the S that does not arrive in the expected order satisfies the specified quantity condition, the data message that the receiver device R has received from the sender device S that does not arrive in the expected order satisfies the specified time condition (ie, : The receiving device R sends to the sender device S when there is a time in the receiver device R that the data message received from the sender device S that has not arrived in the expected order has lasted for less than the first time threshold SJ) The normal acknowledgement message of the SACK option is not included, however, the present invention is not limited thereto. In some other embodiments of the present invention, the receiver device R may be directly determined without considering whether the data message that the receiver device R has received from the sender device S that does not arrive in the expected order meets the specified quantity condition. Whether the data message received from the sender device S that does not arrive in the expected order satisfies the specified time condition, and when it is determined that the data message that the receiver device R has received from the sender device S that does not arrive in the expected order satisfies the specified In the time condition, the receiver device R sends a normal acknowledgement message that does not include the SACK option to the sender device S.

In addition, for the present invention, the specified time condition is not limited to: Since the presence of the data message received from the sender device S in the receiver device R that has not arrived in the expected order has lasted for less than the first time Threshold SJ. In some other embodiments of the present invention, the specified time condition may be, for example, in the case that there is a data message that does not arrive in the expected order in the receiving device R, since the last time the receiving device R is sent to the sender The time elapsed since the device S sends the selective acknowledgment message including the SACK option does not reach the predetermined time threshold. It will be understood by those skilled in the art that although in the above various embodiments, the first number threshold FI is equal to half of the receiving window of the receiving device R, the present invention is not limited thereto. In some other embodiments of the present invention, the first number threshold FI may also be other values, such as 1/3 or 3/4 of the receiving window of the receiving device R, and the like. Referring to Figure 4, there is shown a schematic diagram of an apparatus for controlling data transmission in accordance with one embodiment of the present invention. Those skilled in the art should understand that the apparatus shown in FIG. 3 can be implemented by means of software, hardware or a combination of software and hardware, and can be installed in a receiver device.

As shown in FIG. 4, means 30 for controlling data transmission may include a decision module 310 and a transmit module 320. The determining module 310 is configured to: when the receiving device R receives the data message that does not arrive in the expected order from the sending device S, determine that the receiving device R has received from the sending device S and does not arrive in the expected order. Whether the data message meets the specified quantity condition. The sending module 320 is configured to: when the determination result is yes, send, to the sender device S, an acknowledgement message that does not include the selective acknowledgement SACK option, where the SACK option carries the receiver that the receiver device R has received from the sender device S. Information about data packets arriving in the expected order.

Further, optionally, the sending module 320 is further configured to: when the determination result is no, send an acknowledgement message including the SACK option to the sender device.

In addition, the determining module 310 may include: a first calculating module, configured to calculate a cumulative quantity of data messages that the receiving device R has received from the sending device S and that are not in the expected order; and a first checking module, configured to: Check if the calculated cumulative quantity does not reach the first quantity threshold. Alternatively, the determining module 310 may include: a second calculating module, configured to calculate that the receiving device R has continuously received from the sending device S after the acknowledgment message including the SACK option is sent to the sending device S last time The number of data packets that arrive in sequence; and, the second checking module, is configured to check whether the calculated quantity does not reach the second quantity threshold. Alternatively, the determining module 310 may include: a third calculating module, configured to calculate a sum of data included in all data messages that the receiving device R has received from the sender device S and that are not in the expected order; and, the third check A module, configured to check if the calculated sum does not reach a third number threshold.

The second number threshold may be equal to the number of repeated acknowledgment messages required by the sender device S to trigger the congestion control mechanism, and the first number threshold may be equal to half of the receiving window of the receiver device R.

In addition, the device 30 may further include: a determining module, configured to determine, when the determination result of the determining module 310 is YES, whether the data that the receiving device R has received from the sender device S that does not arrive in the expected order meets the specified time condition. And, the transmitting module is configured to send, to the sender device S, an acknowledgement message that does not include the SACK option when the determination result is yes.

In addition, the determining module may further include: a fourth calculating module, configured to calculate the receiving device There is a time in R that the data message received from the sender device S that has not arrived in the expected order has been continued; and a fourth checking module is configured to check whether the calculated time has not reached the specified time threshold. Referring to Figure 5, a schematic diagram of a communication system in accordance with one embodiment of the present invention is shown. As shown in FIG. 5, communication system 40 can include a sender device 410 and a receiver device 420. The sender device 410 is configured to send a data packet to the receiver device 420. The receiving device 420 is configured to, when receiving a data message that does not arrive in the expected order from the sender device 410, determine whether the data message that the receiving device 420 has received from the sender device 10 that does not arrive in the expected order satisfies the designation. The quantity condition, and when the determination result is yes, send an acknowledgement message to the sender device 410 that does not include the SACK option, wherein the SACK option carries the recipient device 420 that has received from the sender device 410 and does not arrive in the expected order. Information about the data message.

In addition, the receiver device 420 is further configured to: when the determination result is no, determine whether the data that the receiver device 420 has received from the sender device 410 that does not arrive in the expected order meets the specified time condition, and when the determination result is positive Sending an acknowledgement message that does not include the SACK option to the sender device 410.

Referring to Figure 6, a schematic diagram of a computer system in accordance with one embodiment of the present invention is shown. As shown in FIG. 6, computer system 60 includes: a bus 610; a processor 620 coupled to bus 610 and a memory 630 coupled to bus 610.

The processor 620 calls the executable instructions stored in the memory 630 via the bus 610 for determining that the computer system 60 has been received from the sender device when receiving a data message that does not arrive in the expected order. Whether the data message received by the sender device that does not arrive in the expected order satisfies the specified quantity condition; and, when the determination result is yes, sends an acknowledgement message that does not include the SACK option to the sender device, where the SACK option carries the computer The system 60 has received information from the sender device that the data message did not arrive in the expected order.

In addition, the processor 620 may be further configured to: when the determination result is no, determine whether the data that the computer system 60 has received from the sender device that does not arrive in the expected order meets the specified time condition, and when the determination result is affirmative, The sender device sends an acknowledgment message that does not include the SACK option. Embodiments of the present invention also provide a machine readable medium having executable instructions stored thereon that, when executed, cause a machine to perform the steps performed by processor 620. Those skilled in the art should understand that the solution for controlling data transmission disclosed by the present invention can be applied not only to TCP but also to other data transmission protocols, such as User Datagram Protocol (UDP), flow control transmission. Protocol (SCTP: Stream Control Transmission Protocol), etc. It should be understood by those skilled in the art that various modifications and changes may be made without departing from the spirit and scope of the invention. Therefore, the scope of the invention should be defined by the appended claims.

Claims

claims

1. A method for controlling data transmission, including steps:

When the receiving device receives data packets that do not arrive in the expected order from the sending device, it determines whether the data packets that the receiving device has received from the sending device and do not arrive in the expected order satisfy the specified number. condition;

When the judgment result is yes, send an acknowledgment message that does not include the selective response SACK option to the sender device, wherein the SACK option carries the message that the receiver device has received from the sender device and is not in accordance with the Information about the order in which data packets are expected to arrive.

2. The method of claim 1, wherein the judging step includes:

Calculate the cumulative number of data packets that the recipient device has received from the sender device that did not arrive in the expected order; and

Check whether the calculated cumulative quantity does not reach the first quantity threshold.

3. The method of claim 1, wherein the judging step includes:

Calculate the number of data packets that the receiving device has continuously received from the sending device since the last time it sent an acknowledgment message including the SACK option to the sending device that did not arrive in the expected order; and

Check whether the calculated quantity does not reach the second quantity threshold.

4. The method of claim 1, wherein the judging step includes:

Calculating the sum of data included in all data packets that the recipient device has received from the sender device that did not arrive in the expected order; and

Check whether the calculated sum does not reach the third quantity threshold.

5. The method of claim 2, wherein

The first quantity threshold is equal to half the reception window of the recipient device.

6. The method of claim 3, wherein The second quantity threshold is equal to the number of consecutively repeated acknowledgment messages required by the sender device to trigger the congestion control mechanism.

7. The method of claim 4, wherein

The third quantity threshold is equal to the amount of data that can be accommodated by half of the receiving window of the receiving device.

8. The method of claim 1, further comprising:

When the judgment result is no, determine whether the data that the receiving device has received from the sending device and does not arrive in the expected order satisfies the specified time condition; and

When the determination result is positive, a confirmation message not including the SACK option is sent to the sending device.

9. The method of claim 8, wherein the determining step includes:

Calculate the time that has elapsed since there was a data packet in the receiving device that was received from the sending device and did not arrive in the expected order; and

Checks whether the calculated time does not reach the specified time threshold.

10. A device for controlling data transmission, including:

A judging module, configured to judge that the receiving device has received the data packets that have not arrived in the expected order from the sending device when the receiving device receives the data packets that have not arrived in the expected order from the sending device. Whether the specified quantity conditions are met;

A sending module, configured to send a confirmation message that does not include a selective response SACK option to the sending device when the judgment result is yes, wherein the SACK option carries the information that the receiving device has received from the sending device. Information about received data packets that did not arrive in the expected order.

11. The device according to claim 10, wherein the judgment module includes:

A first calculation module, configured to calculate the cumulative number of data packets that the receiver device has received from the sender device that do not arrive in the expected order; and

The first checking module is used to check whether the calculated cumulative quantity does not reach the first quantity threshold.

12. The device of claim 10, wherein the judgment module includes: a second calculation module, configured to calculate the The number of data packets that the receiving device has received consecutively from the sending device that did not arrive in the expected order; and

The second checking module is used to check whether the calculated quantity does not reach the second quantity threshold.

13. The device according to claim 10, wherein the judgment module includes:

A third calculation module, configured to calculate the sum of data included in all data packets that the receiver device has received from the sender device and do not arrive in the expected order; and

The third checking module is used to check whether the calculated sum does not reach the third quantity threshold.

14. The device of claim 9, further comprising:

a determination module, configured to determine whether the data that has been received by the receiving device from the sending device and has not arrived in the expected order when the determination result is negative, and whether the data that has not arrived in the expected order satisfies the specified time condition; and a transmitting module is configured to determine when the determination result is If yes, send an acknowledgment message that does not include the SACK option to the sender device.

15. The device according to claim 14, wherein the determining module includes:

The fourth calculation module is used to calculate the time that has lasted since the data packets received from the sender device that did not arrive in the expected order existed in the receiver device; and

The fourth checking module is used to check whether the calculated time does not reach the specified time threshold.

16. A communication system, including:

The sender device is used to send a data message to the receiver device; and

The receiving device is configured to, when receiving a data packet that does not arrive in an expected order from the sending device, determine that the receiving device has received a data packet that does not arrive in an expected order from the sending device. Whether the message meets the specified quantity condition, and when the judgment result is yes, send a confirmation message that does not include the selective response SACK option to the sender device, wherein the SACK option carries the information that the receiver device has received from all The sending device received data that did not arrive in the order expected. information of the data packet.

17. The communication system according to claim 16, characterized in that,

The receiving device is also configured to determine whether the data that has been received by the receiving device from the sending device and does not arrive in an expected order when the judgment result is no, and determines whether the data that has not arrived in an expected order satisfies a specified time condition, and when the determination result If the result is positive, send an acknowledgment message that does not include the SACK option to the sender device.

18. A computer system, characterized in that it includes: a processor connected to the bus;

a memory connected to said bus;

Wherein, the processor calls the executable instructions stored in the memory through the bus for:

When the computer system receives data packets that do not arrive in the expected order from the sender device, it is determined whether the data packets that the computer system has received from the sender device and do not arrive in the expected order satisfy a specified number. conditions; and

When the judgment result is yes, send an acknowledgment message that does not include a selective response SACK option to the sending device, where the SACK option carries an error message that the computer system has received from the sending device and is not as expected. Information about sequentially arriving data packets.

19. The computer system according to claim 18, wherein the processor is further configured to determine that the computer system has received from the sender device not in an expected order when the judgment result is no. Whether the arriving data meets the specified time condition, and when the determination result is positive, an acknowledgment message not including the SACK option is sent to the sending device.