CN102404187A - Congestion control method and system as well as network equipment - Google Patents

Abstract

Embodiments of the present invention provide a congestion control method and system as well as network equipment. Wherein the congestion control method includes: acquiring network bandwidth information of a data transmission path between the sending end device and the receiving end device; adjusting the data transmission rate according to the network bandwidth information; according to the adjusted data transmission rate, Send packet data to the receiving end device. In the embodiment of the present invention, the sending end device adjusts the data sending rate with high precision without large fluctuations. Moreover, the packet data can be transmitted on the data transmission path without congestion, and the network performance can be fully utilized to avoid waste of network resources.

Description

Congestion control method and system, and network device

technical field

The embodiments of the present invention relate to communication technologies, and in particular to a congestion control method and system and network equipment.

Background technique

Transmission Control Protocol (Transmission Control Protocol, hereinafter referred to as: TCP) is a commonly used transport layer protocol at present, which can be used for reliable data transmission between nodes in a packet network. Congestion control is an important control function of TCP to ensure reliable data transmission in packet networks. The so-called congestion control refers to the control of sending data to the network to avoid congestion caused by too much data exceeding the limit that the intermediate network can bear.

In the prior art, the sender device adjusts the data transmission rate by adjusting the size of the send window according to the number of received ACK messages, so as to achieve congestion control, while the receiver device receives packet data and returns ACK messages subject to many network factors Therefore, the sending end device calculates the sending window size according to the number of received ACK messages and performs congestion control according to the sending window size with low control precision.

Contents of the invention

Embodiments of the present invention provide a congestion control method and system as well as a network device, so as to solve the problem of low control precision when the sending end device performs congestion control.

An embodiment of the present invention provides a congestion control method, including:

Obtain the network bandwidth information of the data transmission path between the sending end device and the receiving end device;

Adjusting the data transmission rate according to the network bandwidth information;

Send packet data to the receiving end device according to the adjusted and processed data sending rate.

The embodiment of the present invention also provides a network device, including:

An acquisition module, configured to acquire network bandwidth information of a data transmission path between the sending end device and the receiving end device;

A processing module, configured to adjust the data transmission rate according to the network bandwidth information obtained by the obtaining module;

A sending module, configured to adjust the processed data sending rate according to the processing module, and send packet data to the receiving end device.

An embodiment of the present invention further provides a congestion control system, including: a sending end device and a receiving end device,

The sending end device is configured to obtain network bandwidth information of a data transmission path between the sending end device and the receiving end device; adjust the data transmission rate according to the network bandwidth information; sending data at a rate of , sending packet data to the receiving end device;

The receiving end device is configured to receive the packet data sent by the sending end device.

In the congestion control method and system and the network device provided by the embodiments of the present invention, the sending end device adjusts the data transmission rate by using the network bandwidth information, so that the data sending rate changes around the change of the network bandwidth information. Therefore, the sending end device The accuracy of adjusting the data transmission rate is high, and there will be no large fluctuations as in the sliding window mechanism. Moreover, the data transmission rate of the sender device to send packet data matches the capability of the data transmission path, so that the packet data can be transmitted on the non-congested data transmission path, and the network performance can be fully utilized to avoid waste of network resources. .

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description These are some embodiments of the present invention. For those skilled in the art, other drawings can also be obtained according to these drawings without any creative effort.

FIG. 1 is a flowchart of Embodiment 1 of the congestion control method of the present invention;

FIG. 2 is a flowchart of Embodiment 2 of the congestion control method of the present invention;

FIG. 3 is a flow chart of Embodiment 3 of the congestion control method of the present invention;

FIG. 4 is a flowchart of Embodiment 4 of the congestion control method of the present invention;

FIG. 5 is a flow chart of Embodiment 5 of the congestion control method of the present invention;

FIG. 6 is a schematic structural diagram of an embodiment of a network device according to the present invention;

FIG. 7 is a schematic structural diagram of Embodiment 1 of the congestion control system of the present invention;

FIG. 8 is a schematic structural diagram of Embodiment 2 of the congestion control system of the present invention.

Detailed ways

In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments It is a part of embodiments of the present invention, but not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

Fig. 1 is a flow chart of Embodiment 1 of the congestion control method of the present invention. As shown in Fig. 1, the method of this embodiment may include:

Step 101. Obtain network bandwidth information of a data transmission path between a sending end device and a receiving end device.

In the process of implementing the present invention, the inventors found that the packet network has two capabilities: packet data forwarding capability and packet data buffering capability, and these two capabilities are not directly related. As a packet storage and forwarding device, the router has a strong queue storage function, that is to say, the packet data sent by the sending end device to the receiving end device can be cached in the router and then forwarded to the receiving end device. Therefore, For this part of buffered packet data, the time for its ACK message to be fed back to the sending end device will be delayed. Or the data transmission path discards the ACK message fed back to the sender device under the action of many other network factors, causing the sender device to mistakenly believe that it is due to network congestion, resulting in packet data transmission failure. Therefore, if the existing technology is adopted, since these delayed ACK messages are not received within a certain period of time, the sending end device will consider that congestion occurs, and then reduce the size of the sending window, and when these delayed ACK messages are subsequently received , the sending end device will think that the congestion state has been eliminated, and then increase the size of the sending window. Therefore, the congestion control method in the prior art is likely to cause large fluctuations in the size of the sending window, and cannot fully and effectively utilize the network forwarding capability; moreover, the sending end device cannot confirm whether there will be congestion when sending packet data with the adjusted sending window, When the sending window increases to exceed the actual packet forwarding capability of the network, the excess packet data will be discarded by the network, resulting in a waste of network resources.

It is precisely for the above-mentioned existing technology that adjusts the size of the sending window of the sending end device, that is, the problem caused when the data sending rate is adjusted. In this embodiment, the sending end device can adjust the packet size based on the current network environment. The data rate at which data is sent to avoid congestion.

Specifically, the sending end device may acquire network bandwidth information of the data transmission path between the sending end device and the receiving end device.

This embodiment does not limit the manner in which the sending end device obtains the network bandwidth information, for example, it does not limit what kind of message the network bandwidth information is included in, nor does it limit the network entity from which the sending end device obtains the network bandwidth information. For example, it is not limited that the network bandwidth information is sent by the receiving end device, and it may be sent by any network entity in the network that has the function of network bandwidth monitoring or network bandwidth management. Moreover, those skilled in the art can adjust the monitoring or management period of the network bandwidth information as required, or adjust the bandwidth management monitoring mode to be event-triggered, so that the sending end device can The network bandwidth information adjusts the data sending rate.

Step 102, adjust the data sending rate according to the network bandwidth information.

After obtaining the network bandwidth information, the sending end device can know the current network environment. Those skilled in the art can understand that the network bandwidth information is not limited to the network bandwidth bandwidth itself, but represents any parameter that can reflect the network bandwidth information.

Specifically, if the network environment reflected by the network bandwidth information is good, the sending device can increase the data transmission rate correspondingly, while the network environment reflected by the network bandwidth information is poor, for example, when congestion has occurred, then The sending end device can reduce the data sending rate accordingly. Therefore, in this embodiment, the network bandwidth information can be used as a reference standard for adjusting the data transmission rate, so that the data transmission rate changes around the change of the network bandwidth information. Therefore, the sending end device can adjust the data transmission rate with high accuracy , without large fluctuations like the sliding window mechanism.

It should be noted that the operation of adjusting the data transmission rate can be performed by the sending device directly adjusting the data transmission rate according to the network bandwidth information, or by adjusting the data transmission rate according to the network bandwidth information. Adjust the size of the sending window. In addition, the data sending rate may be the number of data packets sent per unit time, or the number of data bits sent per unit time.

Step 103: Send packet data to the receiving end device according to the adjusted and processed data sending rate.

Since the network bandwidth information can objectively reflect the network environment, and does not depend on the number of ACK messages received by the sending end device and the size of the sending window, the sending end device sends packet data at the adjusted data sending rate. The capabilities of the data transmission path are matched, so that the packet data can be transmitted on the data transmission path without congestion, and the network performance can be fully utilized to avoid waste of network resources.

In the congestion control method of this embodiment, the sending end device adjusts the data transmission rate by using the network bandwidth information, so that the data sending rate changes around the change of the network bandwidth information, therefore, the sending end device adjusts the data sending rate The accuracy is high without large fluctuations. Moreover, the sender device sends packet data at an adjusted data transmission rate that matches the capability of the data transmission path, so that the packet data can be transmitted on the data transmission path without congestion, and the network performance can be fully utilized to avoid Waste of network resources.

The technical solution of the present invention will be described in detail below using three specific embodiments.

FIG. 2 is a flow chart of Embodiment 2 of the congestion control method of the present invention. As shown in FIG. 2, in the method of this embodiment, the network bandwidth information is calculated and obtained by the sending end device itself, and the method of this embodiment may include:

Step 201, the sending end device establishes a TCP connection with the receiving end device.

The initiator of establishing the TCP connection can be either the sending end device or the receiving end device.

Step 202, the sending end device initializes congestion control parameters.

After the sender device establishes a TCP connection with the receiver device, the sender device can initialize congestion control parameters, such as the number of packets N that can be sent before receiving an acknowledgment message, the bandwidth/rate calculation period T, the increase in data transmission rate and path bandwidth. At least one parameter among the quantity factor p, the decrement factor q of the data transmission rate and the path bandwidth when congestion occurs, and the number K of repeated acknowledgment messages triggering fast retransmission.

Step 203, the sending end device sends the first packet data packet to the receiving end device, and records the sending time T0, and then continues to send other packet data packets until the sending of N packet data packets is completed.

Step 204, the sending end device receives the first confirmation message sent by the receiving end device, records the receiving time T1, and calculates the initial data sending rate Rate.

After receiving the first packet sent by the sender device, the receiver device can send an ACK message to the sender device. The ACK message contains the byte order number of the expected next packet. The sequence number can be used to indicate the byte order of the packet that has been received. For example, the byte sequence number of the expected next packet is X, which means that the byte sequence number of the next packet is X-1. have been received consecutively, thereby indicating to the sending end device that the packet data packet bytes were successfully received.

After receiving the first ACK message, the sender device can record the receiving time T1 of the ACK message, and enter the rate-controlled stage.

In this embodiment, it can be assumed that during the period from T0 to T1, the sending end device has sent a total of N packet data packets. Therefore, in this embodiment, formula (4) can be used to calculate and obtain the initial data transmission rate Rate,

$\mathrm{<span\; class="notranslate">\; Rate</span>}<span\; class="notranslate">\; =</span>\frac{\mathrm{<span\; class="notranslate">\; 8</span>}<span\; class="notranslate">\; \&times;</span>\underset{\mathrm{<span\; class="notranslate">\; i</span>}<span\; class="notranslate">\; =</span>\mathrm{<span\; class="notranslate">\; 1</span>}}{\overset{\mathrm{<span\; class="notranslate">\; N</span>}}{\mathrm{<span\; class="notranslate">\; \&Sigma;</span>}}}\mathrm{<span\; class="notranslate">\; packet</span>}<span\; class="notranslate">\; \_</span>{\mathrm{<span\; class="notranslate">\; size</span>}}_{\mathrm{<span\; class="notranslate">\; i</span>}}}{\mathrm{<span\; class="notranslate">\; T</span>}\mathrm{<span\; class="notranslate">\; 1</span>}<span\; class="notranslate">\; -</span>\mathrm{<span\; class="notranslate">\; T</span>}\mathrm{<span\; class="notranslate">\; 0</span>}}<span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; 4</span>}<span\; class="notranslate">\; )</span>$

in, Indicates the sum of the number of bits of the N packet data packets initially sent.

It should be noted that the formula (4) is used for the sending end device to calculate the sending rate of the packet data packet for the first time. In more general cases, the rate calculation can use the formula (3)

$\mathrm{<span\; class="notranslate">\; Rate</span>}<span\; class="notranslate">\; =</span>\frac{\mathrm{<span\; class="notranslate">\; 8</span>}<span\; class="notranslate">\; \&times;</span>\underset{\mathrm{<span\; class="notranslate">\; i</span>}<span\; class="notranslate">\; =</span>\mathrm{<span\; class="notranslate">\; x</span>}}{\overset{\mathrm{<span\; class="notranslate">\; the\; y</span>}}{\mathrm{<span\; class="notranslate">\; \&Sigma;</span>}}}\mathrm{<span\; class="notranslate">\; packet</span>}<span\; class="notranslate">\; \_</span>{\mathrm{<span\; class="notranslate">\; size</span>}}_{\mathrm{<span\; class="notranslate">\; i</span>}}}{\mathrm{<span\; class="notranslate">\; Ty</span>}<span\; class="notranslate">\; -</span>\mathrm{<span\; class="notranslate">\; Tx</span>}}<span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; 3</span>}<span\; class="notranslate">\; )</span>$

Among them, Rate represents the data transmission rate of the sending end device during sending packet data packets x to y, Ty represents the time for sending packet data packet y, and Tx represents the time for sending packet data packet x, Indicates the sum of the total number of bits sent by the sender device during the period of sending packet data packets x to y.

Step 205, the sending end device receives multiple ACK messages sent by the receiving end device, and calculates and acquires network bandwidth information according to the received ACK messages.

Specifically, the sending end device may calculate and acquire the network bandwidth information according to the received confirmation information contained in at least two ACK messages sent by the receiving end device and the receiving time of the confirmation messages. The acknowledgment information is carried by the receiving end device in the ACK message and sent to the sending end device.

After the receiver device receives the packet sent by the sender, it can send ACK messages to the sender in turn, indicating that the packet sent by the sender has been successfully received. The acknowledgment information contained in these ACK messages can be expected. The byte sequence number of the next packet, optionally including an acknowledgment parameter. The optional acknowledgment parameter is used to indicate to the sending end device that the receiving end device has received packet data packets that are not sequentially received, for example, the receiving end device indicates that the byte sequence number of the next packet data packet that the sending end device expects is X1, At the same time, the selective confirmation parameter is used to indicate that the packet data packet bytes with sequence numbers X2~X3 have been received, which means that the receiving end device is waiting to receive packet data with byte sequence numbers X1~X2-1 and byte sequence numbers greater than X3 Bag. After receiving each ACK message, the sending end device records the receiving time of the ACK message, such as time T2, T3, T4, and confirms the amount of data that has been successfully received by the receiving end device and the received amount according to the received ACK message. The receiving time of the previous ACK message and the next ACK message is calculated to obtain the network bandwidth information. During this process, the sender device can select two confirmation messages as required, or select the first confirmation message and the last confirmation message in the period according to the bandwidth measurement period, and the bandwidth calculation period has passed after the TCP connection is established in step 201. The parameter initialization in step 202 is given. Those skilled in the art can understand that, by adjusting the bandwidth calculation period, the update frequency of the data packet sending rate can be adjusted.

For example, this embodiment can apply formula (1) to calculate and obtain network bandwidth information,

$\mathrm{<span\; class="notranslate">\; Bandwidth</span>}<span\; class="notranslate">\; =</span>\frac{\mathrm{<span\; class="notranslate">\; 8</span>}<span\; class="notranslate">\; \&times;</span><span\; class="notranslate">\; [</span><span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; Seq</span>}\mathrm{<span\; class="notranslate">\; 2</span>}<span\; class="notranslate">\; -</span>\mathrm{<span\; class="notranslate">\; Seq</span>}\mathrm{<span\; class="notranslate">\; 1</span>}<span\; class="notranslate">\; )</span><span\; class="notranslate">\; +</span><span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; <figure-callout\; id="2"\; label="SACK"\; filenames="HSA00000271071900042.png,HSA00000271071900043.png"\; state="\{\{state\}\}">SACK</figure-callout></span>}\mathrm{<span\; class="notranslate">\; 2</span>}<span\; class="notranslate">\; \_</span>\mathrm{<span\; class="notranslate">\; block</span>}<span\; class="notranslate">\; -</span>\mathrm{<span\; class="notranslate">\; <figure-callout\; id="1"\; label="SACK"\; filenames="HSA00000271071900042.png,HSA00000271071900043.png"\; state="\{\{state\}\}">SACK</figure-callout></span>}\mathrm{<span\; class="notranslate">\; 1</span>}<span\; class="notranslate">\; \_</span>\mathrm{<span\; class="notranslate">\; block</span>}<span\; class="notranslate">\; )</span><span\; class="notranslate">\; ]</span>}{\mathrm{<span\; class="notranslate">\; T</span>}<span\; class="notranslate">\; \_</span>\mathrm{<span\; class="notranslate">\; ACK</span>}\mathrm{<span\; class="notranslate">\; 2</span>}<span\; class="notranslate">\; -</span>\mathrm{<span\; class="notranslate">\; T</span>}<span\; class="notranslate">\; \_</span>\mathrm{<span\; class="notranslate">\; ACK</span>}\mathrm{<span\; class="notranslate">\; 1</span>}}<span\; class="notranslate">\; \}</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; 1</span>}<span\; class="notranslate">\; )</span>$

Among them, Bandwidth is the network bandwidth, Seq2 is the continuous confirmation sequence number of the next ACK message, Seq1 is the continuous confirmation sequence number of the previous ACK message, SACK2_block is the number of bytes of the optional confirmation parameter in the latter ACK message, and SACK1_block is the previous The number of bytes of optional confirmation parameters in an ACK message, T_ACK2 is the receiving time of the next ACK message, and T_ACK1 is the receiving time of the previous ACK message.

It should be noted that the sending end device can only use continuous acknowledgment messages or ACK messages with optional acknowledgment parameters for bandwidth calculation, but cannot use repeated acknowledgment messages for bandwidth calculation.

It should be noted that Seq1 and Seq2 are sequence numbers of packet data packets, because packet sequence numbers are used in a cyclical manner, for example, the cycle period of sequence numbers is 0 to 65535, then the next sequence number of 65535 is 0. For the case of Seq1<Seq2, formula (1) is used for calculation. When Seq1>Seq2, formula (1) can be further adjusted to formula (2):

$\mathrm{<span\; class="notranslate">\; Bandwidth</span>}<span\; class="notranslate">\; =</span>\frac{\mathrm{<span\; class="notranslate">\; 8</span>}<span\; class="notranslate">\; \&times;</span><span\; class="notranslate">\; [</span><span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; Seq</span>}\mathrm{<span\; class="notranslate">\; 2</span>}<span\; class="notranslate">\; -</span>\mathrm{<span\; class="notranslate">\; <figure-callout\; id="1"\; label="Seq"\; filenames="HSA00000271071900042.png,HSA00000271071900043.png"\; state="\{\{state\}\}">Seq</figure-callout></span>}\mathrm{<span\; class="notranslate">\; 1</span>}<span\; class="notranslate">\; +</span>\mathrm{<span\; class="notranslate">\; cycle</span>}<span\; class="notranslate">\; )</span><span\; class="notranslate">\; +</span><span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; <figure-callout\; id="2"\; label="SACK"\; filenames="HSA00000271071900042.png,HSA00000271071900043.png"\; state="\{\{state\}\}">SACK</figure-callout></span>}\mathrm{<span\; class="notranslate">\; 2</span>}<span\; class="notranslate">\; \_</span>\mathrm{<span\; class="notranslate">\; block</span>}<span\; class="notranslate">\; -</span>\mathrm{<span\; class="notranslate">\; <figure-callout\; id="1"\; label="SACK"\; filenames="HSA00000271071900042.png,HSA00000271071900043.png"\; state="\{\{state\}\}">SACK</figure-callout></span>}\mathrm{<span\; class="notranslate">\; 1</span>}<span\; class="notranslate">\; \_</span>\mathrm{<span\; class="notranslate">\; block</span>}<span\; class="notranslate">\; )</span><span\; class="notranslate">\; ]</span>}{\mathrm{<span\; class="notranslate">\; T</span>}<span\; class="notranslate">\; \_</span>\mathrm{<span\; class="notranslate">\; ACK</span>}\mathrm{<span\; class="notranslate">\; 2</span>}<span\; class="notranslate">\; -</span>\mathrm{<span\; class="notranslate">\; T</span>}<span\; class="notranslate">\; \_</span>\mathrm{<span\; class="notranslate">\; ACK</span>}\mathrm{<span\; class="notranslate">\; 1</span>}}<span\; class="notranslate">\; \}</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; 2</span>}<span\; class="notranslate">\; )</span>$

Where Cycle is the sequence number cycle.

It should be noted that, when both ACK messages carry a timestamp option parameter, T_ACK1 and T_ACK2 can be replaced by the values of the timestamps in the respective ACK messages at the same time. The so-called time stamp option parameter in the ACK message refers to the time information of sending the ACK message contained in the message when the receiving device sends the ACK message, and the sending device uses the time information to calculate the bandwidth parameter relative to the recorded For receiving time calculation bandwidth parameters, the calculation accuracy is higher.

The above steps 202 to 205 complete the process of the sending end device acquiring network bandwidth information.

Step 206: Adjust the data sending rate according to the network bandwidth information.

The adjustment process may adopt a periodic processing method, for example, during the data sending process, periodically measure the sending rate of the packet data, acquire network bandwidth information, and adjust the data sending rate according to the network bandwidth information.

Specifically, if a normal acknowledgment message is received, that is, it is not a repeated acknowledgment message, the sending device adjusts the data transmission rate to be greater than the rate of the network bandwidth information; If multiple repeated acknowledgment messages are received, the sending end device will adjust the data transmission rate to be less than the rate of the network bandwidth, and after receiving the normal acknowledgment message again, calculate the new network bandwidth information, and readjust the data transmission rate according to the new network bandwidth information. The above data sending rate; if no confirmation message is received within the data sending rate adjustment period, the sending end device will adjust the data sending rate to be less than the rate of the network bandwidth or keep the rate equal to the known network bandwidth, and re-receive After the confirmation message is received, new network bandwidth information is calculated, and the data sending rate is adjusted according to the new network bandwidth information.

For example, the sending end device may use the increment factor p set during parameter initialization to increase the data sending rate, for example, Rate=Bandwidth+p, or Rate=Bandwidth×(1+p). When the sender device receives several K repeated acknowledgment messages set during parameter initialization, it needs to resend the missing packet data immediately, and immediately reduce the data transmission rate Rate of sending packet data packets, for example, when using parameter initialization Set the decrement factor q to reduce the data transmission rate, such as Rate=Bandwidth-q, or Rate=Bandwidth×q, after the sending device receives a new ACK message, the sending device can recalculate the network bandwidth information, and According to the new network bandwidth information, the data transmission rate of the packet data packets is adjusted. When there is a situation that the data is not confirmed after the timeout, the sending end device needs to resend the timed out unconfirmed packet data immediately, and immediately reduce the rate of sending packets Rate, for example, Rate=Bandwidth-q, wait until the sending end device receives the new After receiving the ACK message, the sending end device can recalculate the network bandwidth information, and adjust the data sending rate of the packet data according to the new network bandwidth information.

Alternatively, the sending end device may also use the ratio of the average size of the sent packet data to the network bandwidth as the data transmission rate, and this ratio is used as the number of packet data packets sent per second to control the sending end device to send the packet data packet s speed.

Step 207: Send packet data to the receiving end device according to the adjusted and processed data sending rate.

It should be noted that the above steps 206 and 207 are repeated throughout the TCP session, and the sending end device records the time of sending all data packets. If the data transmission rate is calculated periodically, as soon as the rate calculation period arrives, the sending end device calculates the data transmission rate according to the packet data sent in the rate calculation period and the cycle time. If the network bandwidth is calculated periodically, as soon as the bandwidth calculation period arrives, the sending device calculates the network bandwidth information, and adjusts the data transmission rate within the data transmission rate adjustment period according to the newly calculated network bandwidth information.

Preferably, the bandwidth calculation period and the data transmission rate calculation period adopted by the sending device can be set to be the same or close to each other, so that the adjusted data transmission rate is as close as possible to the current network environment, thereby improving the adjustment accuracy.

In the congestion control method of this embodiment, the sending end device can calculate the network bandwidth information according to the ACK message received in the bandwidth calculation period, so that the data transmission rate can be adjusted by using the network bandwidth information, so that the data transmission rate is around the network bandwidth information Therefore, the sending end device can adjust the data sending rate with high accuracy without large fluctuations. Moreover, the sender device sends packet data at an adjusted data transmission rate that matches the capability of the data transmission path, so that the packet data can be transmitted on the data transmission path without congestion, and the network performance can be fully utilized to avoid Waste of network resources.

In addition, the method of this embodiment does not need to make any modification to the receiving end device, as long as the receiving end device supports basic TCP protocol functions, it can be implemented, and has good versatility and compatibility.

Fig. 3 is a flow chart of the third embodiment of the congestion control method of the present invention. As shown in Fig. 3, in the method of this embodiment, the network bandwidth information is calculated by the receiving end device and sent to the sending end device, the method of this embodiment Can include:

Step 301, the sending end device sends a synchronization/start message (SYN) to the receiving end device, the synchronization/starting message includes a bandwidth parameter indication, and the bandwidth parameter indication is used to indicate that the receiving end device is requested to include network bandwidth information in the ACK message.

When the sending device establishes a connection establishment message of a TCP connection, for example, the SYN message may include a bandwidth parameter indication, which may indicate the receiving device. The sending device supports the inclusion of network bandwidth information in the ACK message, and hopes to communicate with the receiving device. The device uses network bandwidth information in this TCP session. Optionally, the SYN message may also include a bandwidth/rate calculation period suggested by the sending end device.

It should be noted that this embodiment only shows that the sending end device initiates establishment of the TCP connection to the receiving end, and those skilled in the art can understand that the receiving end device may also initiate the establishment of the TCP connection.

Step 302, the receiving end device sends a synchronization/acknowledgment message (SYN/ACK) to the sending end device, and the synchronization/acknowledgment message includes a bandwidth parameter indication.

After the receiver device receives the sync/start message with the bandwidth parameter indication, if the receiver device also supports the inclusion of the bandwidth parameter in the ACK message, and is willing to use the network bandwidth information in this TCP session with the sender device, then The receiving end device may also include the bandwidth parameter indication in the SYN/ACK message fed back to the sending end device. Optionally, the SYN/ACK message may also include a bandwidth/rate calculation cycle supported by the receiver device.

Step 303, the sending end device sends an ACK message to the receiving end device, and the ACK message includes a bandwidth parameter indication.

Optionally, the ACK message may also include a bandwidth/rate calculation cycle negotiated between the sending end device and the receiving end device.

So far, the TCP connection between the sending end device and the receiving end device is established, and the sending end device and the receiving end device agree to include network bandwidth information in the ACK message.

Step 304, the sending end device initializes congestion control parameters.

The implementation process is similar to the above-mentioned step 202, and will not be repeated here.

Step 305, the sending end device sends the packet data packet to the receiving end device.

Optionally, after sending each packet data packet, the sending end device may record the sending time of each packet data packet.

Step 306: After receiving the packets sent by the sender device, the receiver device records the receiving time of each packet, and sends an ACK message to the sender device, wherein the ACK message includes network bandwidth information.

After the receiving end device receives the packet sent by the sending end device, it can send ACK messages to the sending end device in turn, indicating that the packet data packet sent by the sending end device has been successfully received, and these ACK messages can contain the expected next packet The byte order number of the packet, and optionally the acknowledgment parameter. The optional acknowledgment parameter is used to indicate to the sending end device that the receiving end device has received packet data packets that are not sequentially received, for example, the receiving end device indicates that the byte sequence number of the next packet data packet that the sending end device expects is X1, At the same time, the selective confirmation parameter is used to indicate that the packet data packet bytes with sequence numbers X2~X3 have been received, which means that the receiving end device is waiting to receive packet data with byte sequence numbers X1~X2-1 and byte sequence numbers greater than X3 Bag.

After receiving more than two packet data packets, the receiver device can obtain network bandwidth information by calculating the average amount of packet data packets received per unit time, for example, according to the data of all packet data packets received within a certain period of time The sum of the amount, as well as the receiving time of the first packet data packet and the receiving time of the last packet data packet received in this time period, calculate and obtain the network bandwidth information. The specific calculation method can be all data packet data in a certain time period The sum of the quantities is divided by the duration of the time period.

After receiving the first ACK message, the sender device can calculate the initial data transmission rate Rate according to formula (4), and in the subsequent data transmission process, periodically calculate the data transmission rate Rate according to formula (3). The implementation principle Similar and will not be repeated here.

Step 307: After receiving the ACK message including the network bandwidth information, the sending device can adjust the data sending rate according to the network bandwidth information.

The adjustment process can be realized by using the specific implementation manner described in the above step 206, which will not be repeated here.

Step 308, the sending end device sends the packet data packet to the receiving end device according to the adjusted and processed data sending rate.

It should be noted that the above steps 306 to 308 are repeated during the entire TCP session. As soon as the bandwidth calculation cycle arrives, the receiving end device can calculate the network bandwidth information and calculate the obtained network bandwidth information and send it to the sending end device, so that the sending end device can adjust the data sending rate within the data sending rate adjustment period according to the newly calculated network bandwidth information.

Preferably, the bandwidth calculation period and the data transmission rate adjustment period adopted by the sending device can be set to be the same or close to each other, so that the adjusted data transmission rate is as close as possible to the current network environment, thereby improving the adjustment accuracy.

In the congestion control method of this embodiment, the receiving end device can calculate the number of packet data packets received in the bandwidth calculation period and the difference between the receiving time of the first packet data packet and the receiving time of the last packet data packet in the bandwidth calculation period Value, calculate the network bandwidth information and send the calculated network bandwidth information to the sender device through a confirmation message, so that the sender device can adjust the data transmission rate according to the network bandwidth information, so that the data transmission rate is around the change of the network bandwidth information Therefore, the sending end device can adjust the data sending rate with high accuracy without large fluctuations. Moreover, compared with the technical solution of the second embodiment of the above-mentioned congestion control method, the network bandwidth information obtained through calculation in this embodiment is more accurate. In addition, the sender device sends packet data packets at an adjusted data transmission rate that matches the capability of the data transmission path, so that the packet data packets can be transmitted on the data transmission path without congestion, and the network performance can be fully utilized , to avoid wasting network resources.

FIG. 4 is a flow chart of Embodiment 4 of the congestion control method of the present invention. As shown in FIG. 4, in the method of this embodiment, the sending end device may obtain network bandwidth information from a network functional entity with bandwidth measurement or bandwidth management functions. The method of an embodiment may include:

Step 401, the sending end device establishes a TCP session with the receiving end device.

In step 402, the sending end device acquires network bandwidth information from a network functional entity having a bandwidth measurement or bandwidth management function.

Specifically, the method for the sending end device to obtain network bandwidth information may be that the sending end device directly sends a query request to the network function entity and receives a response message carrying the network bandwidth information sent by the network function entity, or the network function entity actively sends a query request to the network function entity. The sending end device sends network bandwidth information. The above two methods can be either periodic query/response and indication transactions, or event-triggered query/response and indication transactions, for example, the sender device queries network bandwidth information after a TCP session is successfully established, Query the network bandwidth information after repeatedly confirming the message, query the network bandwidth information when the sending device fails to confirm after a timeout, or the network functional entity immediately sends the network bandwidth information to the sending device when it finds that the network bandwidth information has changed.

It should be noted that the network functional entity with bandwidth measurement or bandwidth management functions can be on the sending end device or on other devices. If the network function entity is on other devices, the sending end device can Establish a network connection with the device.

For example, the network functional entity can be an Asynchronous Transfer Mode (Asynchronous Transfer Mode, hereinafter referred to as: ATM) channel management unit, which can obtain the configuration bandwidth of the ATM channel, or a wireless network control unit of the wireless access network, whose The bandwidth capability allocated by the radio bearer of the air interface may be obtained, or the resource management unit of the router may obtain the packet forwarding capability allocated for the specified interface.

It should be noted that when the sending device continuously receives multiple repeated acknowledgment messages reaching the threshold, for example, more than K, the sending device can immediately retransmit the missing packet, and immediately query the network bandwidth information from the network functional entity; When the ACK message is not received for a packet data packet timeout, the missing packet data packet can also be retransmitted immediately, and the network bandwidth information can be immediately inquired from the network functional entity.

Step 403, adjust the data sending rate according to the network bandwidth information.

Step 404: Send packet data to the receiving end device according to the adjusted and processed data sending rate.

Step 403 and step 404 can be repeatedly executed in the TCP session, and the implementation methods of step 403 and step 404 are similar to the implementation methods of the corresponding parts of the above-mentioned congestion control method embodiment 1 to embodiment 3, and will not be repeated here.

In the congestion control method of this embodiment, the sending end device can obtain the network bandwidth information from a network functional entity with a bandwidth measurement or bandwidth management function, thereby eliminating the burden of calculating the network bandwidth information on the sending end device or the receiving end device itself , and can obtain more accurate network bandwidth information, the sending device can directly use the network bandwidth information acquired by the monitoring of the network functional entity to adjust the data transmission rate, so that the data transmission rate changes around the change of the network bandwidth information, therefore, the sending The end device can adjust the data transmission rate with high accuracy without large fluctuations. Moreover, the sender device sends packet data at an adjusted data transmission rate that matches the capability of the data transmission path, so that the packet data can be transmitted on the data transmission path without congestion, and the network performance can be fully utilized to avoid Waste of network resources. In addition, the network function entity can be maintained independently without changing the sending end device and the receiving end device.

FIG. 5 is a flow chart of Embodiment 5 of the congestion control method of the present invention. As shown in FIG. 5 , in this embodiment, the receiving end device may obtain network bandwidth information from a network functional entity having a bandwidth measurement or bandwidth management function, and then the The network bandwidth information is sent to the sending end device, and the method of this embodiment may include:

Step 501, the sending end device establishes a TCP session with the receiving end device.

Step 502, the receiver device obtains network bandwidth information from a network functional entity having a network bandwidth measurement function or a network bandwidth management function.

Specifically, the way for the receiving end device to obtain network bandwidth information may be that the receiving end device directly sends a query request to a network functional entity with a network bandwidth measurement function or a network bandwidth management function and receives the network bandwidth information sent by the network functional entity. The response message may also be that a network functional entity with a network bandwidth measurement function or a network bandwidth management function actively sends network bandwidth information to the receiving end device. The above two methods can be either periodic query/response and indication transactions, or event-triggered query/response and indication transactions. For example, the receiving end device queries network bandwidth information after successfully establishing a TCP The sending-end device queries the network bandwidth information after sending a repeated confirmation message, or the network functional entity with the network bandwidth measurement function or the network bandwidth management function finds that the network bandwidth changes and immediately sends the network bandwidth information to the receiving-end device.

It should be noted that the network functional entity with the network bandwidth measurement function or the network bandwidth management function can be on the receiving end device or on other devices. If the network functional entity is on other devices, then The receiver device can establish a network connection with the device.

For example, the network function entity can be an ATM channel management unit, which can obtain the configured bandwidth of the ATM channel, or a radio network control unit of the radio access network, which can obtain the bandwidth capability allocated by the air interface radio bearer, Or it may be a resource management unit of a router, which can obtain the packet forwarding capability allocated for a specified interface.

Step 503, the receiver device sends the network bandwidth information to the sender device.

The receiving end device may send the network bandwidth information to the sending end device through an ACK message, or may use a new session message to send the network bandwidth information to the sending end device. After the sending device receives the message containing the network bandwidth information, if the sending device does not support the way of adjusting the data transmission rate according to the network bandwidth information, it can discard the message; The bandwidth information adjusts the data transmission rate of the packet data packets.

Step 504, the sending end device adjusts the data sending rate according to the network bandwidth information.

Step 505: Send packet data to the receiving end device according to the adjusted data sending rate.

Steps 502 to 505 can be repeatedly executed in a TCP session, and the implementation methods of steps 504 and 505 are similar to the implementation methods of the corresponding parts of the first to third embodiments of the above congestion control method, and will not be repeated here.

In the congestion control method of this embodiment, the receiving end device can obtain the network bandwidth information from a network functional entity with a network bandwidth measurement function or a network bandwidth management function, and send the network bandwidth information to the sending end device, thereby eliminating the need for It relieves the burden of calculating the network bandwidth of the sending end device or the receiving end device itself, and can obtain more accurate network bandwidth information. The sending end device can directly use the network bandwidth information obtained from the receiving end device to adjust the data transmission rate, so that the data transmission rate changes around the change of the network bandwidth. Therefore, the sending end device can adjust the data transmission rate with high accuracy , without large fluctuations. Moreover, the sender device sends packet data at an adjusted data transmission rate that matches the capability of the data transmission path, so that the packet data can be transmitted on the data transmission path without congestion, and the network performance can be fully utilized to avoid Waste of network resources. In addition, the network function entity can be maintained independently without changing the sending end device and the receiving end device.

FIG. 6 is a schematic structural diagram of an embodiment of a network device of the present invention. As shown in FIG. 6, the network device of this embodiment includes: an acquisition module 11, a processing module 12, and a sending module 13, wherein the acquisition module 11 is used to acquire the sending end device and the network bandwidth information of the data transmission path between the receiving end device; the processing module 12 is used to adjust the data transmission rate according to the network bandwidth information obtained by the obtaining module 11; the sending module 13 is used to adjust the processed data according to the processing module 12 The data transmission rate is , and the packet data is sent to the receiving end device.

The network device in this embodiment can be used to implement the technical solution of Embodiment 1 of the congestion control method shown in FIG. 1 , and its implementation principles and technical effects are similar, and will not be repeated here.

Further, in another embodiment of the network device of the present invention, the acquiring module 11 may be specifically configured to calculate and acquire the Network bandwidth information; or calculate and obtain the network bandwidth according to the received confirmation information in the confirmation message sent by the receiving end device, the time information contained in the subsequent confirmation message, and the time information contained in the previous confirmation message information; or receive an acknowledgment message sent by the receiving end device, the acknowledgment message includes network bandwidth information, and the network bandwidth information is obtained by the receiving end device calculating the average amount of data packets received per unit time Either obtained from a network functional entity having a bandwidth measurement or bandwidth management function; or obtaining the network bandwidth information from a network functional entity having a bandwidth measurement or bandwidth management function.

The acquiring module 11 can acquire the network bandwidth information in the above ways, which respectively correspond to Embodiments 2 to 4 of the congestion control method shown in FIGS.

FIG. 7 is a schematic structural diagram of Embodiment 1 of the congestion control system of the present invention. As shown in FIG. 7 , the system of this embodiment may include: a sending end device 1 and a receiving end device 2, wherein the sending end device 1 is used to obtain the sending end device The network bandwidth information of the data transmission path between 1 and the receiving end device 2; according to the network bandwidth information, the data transmission rate is adjusted; according to the adjusted data transmission rate, the packet data is sent to the receiving end device 2; the receiving end Device 2 is configured to receive packet data sent by device 1 at the sending end.

The system of this embodiment can be used to implement the technical solution of Embodiment 1 of the congestion control method shown in FIG. 1 , and its realization principle is similar and its technical effect is not repeated here.

In another embodiment of the congestion control system of the present invention, on the basis of the first system embodiment above, the sending end device 1 can be specifically configured to: According to the receiving time of the message, calculate and obtain the network bandwidth information; or according to the received confirmation information in the confirmation message sent by the receiving end device, the time information contained in the subsequent confirmation message, and the time information contained in the previous confirmation message Time information, calculating and obtaining the network bandwidth information. In this embodiment, the sending-end device 1 and the receiving-end device 2 can implement the technical solution of the second embodiment of the congestion control method shown in FIG. 2 , and the implementation principles and technical effects thereof are similar, and will not be repeated here.

Another embodiment of the congestion control system of the present invention is further based on the first embodiment of the above system. The receiver device 2 can be specifically configured to send a confirmation message containing network bandwidth information to the sender device 1. The network bandwidth information is the receiver device 2 It is obtained by calculating the average amount of data packets received per unit time. In this embodiment, the sending-end device 1 and the receiving-end device 2 can implement the technical solution of the third embodiment of the congestion control method shown in FIG. 3 , and the implementation principles and technical effects thereof are similar, and will not be repeated here.

Fig. 8 is a schematic structural diagram of Embodiment 2 of the congestion control system of the present invention. As shown in Fig. 8 , the system of this embodiment further includes: a network function entity 3 on the basis of the system embodiment 1 shown in Fig. 7 , the network function Entity 3 is used to monitor and obtain network bandwidth information, and send the network bandwidth information to the sending device 1, or send the network bandwidth information to the receiving device 2, and send it to the sending device 1 through the receiving device 2.

In this embodiment, the sending end device 1, the receiving end device 2, and the network function entity 3 can implement the technical solution of the fourth embodiment of the congestion control method shown in FIG. 4 or the fifth embodiment of the congestion control method shown in FIG. 5, wherein The implementation principles are similar and the technical effects are not repeated here.

Those of ordinary skill in the art can understand that all or part of the steps for realizing the above-mentioned method embodiments can be completed by hardware related to program instructions, and the aforementioned program can be stored in a computer-readable storage medium. When the program is executed, the It includes the steps of the above method embodiments; and the aforementioned storage medium includes: ROM, RAM, magnetic disk or optical disk and other various media that can store program codes.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: it can still be Modifications are made to the technical solutions described in the foregoing embodiments, or equivalent replacements are made to some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims (15)

1. A congestion control method, comprising:

acquiring network bandwidth information of a data transmission path between sending end equipment and receiving end equipment;

adjusting the data sending rate according to the network bandwidth information;

and sending the grouped data to the receiving terminal equipment according to the adjusted data sending rate.

2. The congestion control method according to claim 1, wherein the obtaining network bandwidth information of the data transmission path between the sending end device and the receiving end device includes:

calculating and acquiring the network bandwidth information according to the received confirmation information contained in the at least two confirmation messages sent by the receiving terminal equipment and the receiving time of the confirmation messages; or

And calculating to acquire the network bandwidth information according to the received confirmation information contained in the at least two confirmation messages sent by the receiving terminal equipment and the time information contained in the confirmation messages.

3. The congestion control method according to claim 2, wherein the calculating to obtain the network bandwidth information comprises: calculating and acquiring the network bandwidth information by applying formula (1),

<math> <mrow> <mi>Bandwidth</mi> <mo>=</mo> <mo>{</mo> <mfrac> <mrow> <mn>8</mn> <mo>&times;</mo> <mo>[</mo> <mrow> <mo>(</mo> <mi>Seq</mi> <mn>2</mn> <mo>-</mo> <mi>Seq</mi> <mn>1</mn> <mo>)</mo> </mrow> <mo>+</mo> <mrow> <mo>(</mo> <mi>SACK</mi> <mn>2</mn> <mo>_</mo> <mi>block</mi> <mo>-</mo> <mi>SACK</mi> <mn>1</mn> <mo>_</mo> <mi>block</mi> <mo>)</mo> </mrow> <mo>]</mo> </mrow> <mrow> <mi>T</mi> <mo>_</mo> <mi>ACK</mi> <mn>2</mn> <mo>-</mo> <mi>T</mi> <mo>_</mo> <mi>ACK</mi> <mn>1</mn> </mrow> </mfrac> <mo>}</mo> <mo>-</mo> <mo>-</mo> <mo>-</mo> <mrow> <mo>(</mo> <mn>1</mn> <mo>)</mo> </mrow> </mrow> </math>

wherein Bandwidth is network Bandwidth information, Seq2 is a consecutive acknowledgement sequence number of a next acknowledgement message, Seq1 is a consecutive acknowledgement sequence number of a previous acknowledgement message, SACK2_ block is the number of bytes of a selective acknowledgement parameter in the next acknowledgement message, SACK1_ block is the number of bytes of a selective acknowledgement parameter in the previous acknowledgement message, T _ ACK2 is the time of receipt of the next acknowledgement message or the time information contained in the next acknowledgement message, and T _ ACK1 is the time of receipt of the previous acknowledgement message or the time information contained in the previous acknowledgement message.

4. The congestion control method according to claim 1, wherein the obtaining network bandwidth information of the data transmission path between the sending end device and the receiving end device includes:

and acquiring the network bandwidth information from a network function entity with a bandwidth measurement or bandwidth management function.

5. The congestion control method according to claim 1, wherein the obtaining network bandwidth information of the data transmission path between the sending end device and the receiving end device includes:

receiving a confirmation message sent by the receiving terminal equipment, and acquiring network bandwidth information contained in the confirmation message; the network bandwidth information is obtained by the receiving end device according to the data amount of the packet data packets received averagely in unit time, or the receiving end device is obtained from a network function entity with a bandwidth measurement or bandwidth management function.

6. The congestion control method according to claim 5, wherein before obtaining the network bandwidth information of the data transmission path between the sending end device and the receiving end device, the method further comprises:

sending a connection establishment message to the receiving end device, wherein the connection establishment message contains a bandwidth parameter indication, and the bandwidth parameter indication is used for indicating that the receiving end device is requested to contain the network bandwidth information in the confirmation message;

and receiving a confirmation message sent by the receiving terminal equipment, wherein the confirmation message comprises a bandwidth parameter indication.

7. The congestion control method according to any one of claims 1 to 6, wherein the adjusting the data transmission rate according to the network bandwidth information includes at least one of the following processing modes:

adjusting the data transmission rate to a rate equal to a network bandwidth;

adjusting the data transmission rate to a rate greater than a network bandwidth;

and adjusting the data sending rate to a rate smaller than the network bandwidth, and after the network bandwidth information is acquired again, adjusting the data sending rate according to the new network bandwidth information.

8. The congestion control method according to any one of claims 1 to 6, wherein the adjusting the data transmission rate according to the network bandwidth information comprises:

and taking the ratio of the average size of the transmitted packet data packets to the network bandwidth information as the packet data transmission rate of the packet data packets.

9. The congestion control method according to any one of claims 1 to 6, wherein before the obtaining the network bandwidth information of the data transmission path between the sending end device and the receiving end device, the method further comprises: the data transmission rate is calculated by applying equation (3),

<math> <mrow> <mi>Rate</mi> <mo>=</mo> <mfrac> <mrow> <mn>8</mn> <mo>&times;</mo> <munderover> <mi>&Sigma;</mi> <mrow> <mi>i</mi> <mo>=</mo> <mi>x</mi> </mrow> <mi>y</mi> </munderover> <mi>packet</mi> <mo>_</mo> <msub> <mi>size</mi> <mi>i</mi> </msub> <mo></mo> </mrow> <mrow> <mi>Ty</mi> <mo>-</mo> <mi>Tx</mi> </mrow> </mfrac> <mo>-</mo> <mo>-</mo> <mo>-</mo> <mrow> <mo>(</mo> <mn>3</mn> <mo>)</mo> </mrow> </mrow> </math>

where Rate denotes a data transmission Rate during which the transmitting-end device transmits a packet data packet x until it transmits a packet data packet y, Ty denotes a time when the packet data packet y is transmitted, Tx denotes a time when the packet data packet x is transmitted,

which represents the sum of the total number of bits transmitted during the period from the transmission of packet x to the transmission of packet y by the transmitting device.

10. A network device, comprising:

the system comprises an acquisition module, a transmission module and a receiving module, wherein the acquisition module is used for acquiring network bandwidth information of a data transmission path between transmitting end equipment and receiving end equipment;

the processing module is used for adjusting the data sending rate according to the network bandwidth information acquired by the acquisition module;

and the sending module is used for sending the grouped data to the receiving terminal equipment according to the data sending rate adjusted and processed by the processing module.

11. The network device according to claim 10, wherein the obtaining module is specifically configured to calculate and obtain the network bandwidth information according to the received acknowledgement information in the acknowledgement message sent by the receiving end device and the receiving time of the acknowledgement message; or

Calculating to obtain the network bandwidth information according to the received acknowledgement information in at least two acknowledgement messages sent by the receiving terminal equipment, the time information contained in the next acknowledgement message and the time information contained in the previous acknowledgement message; or

Receiving a confirmation message sent by the receiving end equipment, and acquiring network bandwidth information from the confirmation message, wherein the network bandwidth information is acquired by the receiving end equipment through calculation according to the data volume of the packet data packets which are averagely received in unit time or acquired by the receiving end equipment from a network function entity with a bandwidth measurement or bandwidth management function; or

And acquiring the network bandwidth information from a network function entity with a bandwidth measurement or bandwidth management function.

12. A congestion control system, comprising: a sending-end device and a receiving-end device,

the sending end equipment is used for acquiring network bandwidth information of a data transmission path between the sending end equipment and the receiving end equipment; adjusting the data sending rate according to the network bandwidth information; sending packet data to the receiving end equipment according to the adjusted data sending rate;

the receiving end device is configured to receive the packet data sent by the sending end device.

13. The congestion control system according to claim 12, wherein the sending end device is specifically configured to calculate and obtain the network bandwidth information according to the received acknowledgment information and the reception time of the acknowledgment information included in the at least two acknowledgment messages sent by the receiving end device; or calculating to obtain the network bandwidth information according to the received acknowledgement information in at least two acknowledgement messages sent by the receiving end device, the time information contained in the next acknowledgement message and the time information contained in the previous acknowledgement message.

14. The congestion control system according to claim 12, wherein the receiving end device is specifically configured to send a confirmation message including network bandwidth information to the sending end device, where the network bandwidth information is obtained by the receiving end device through calculation according to an average received data amount of the packet data packets in a unit time.

15. The congestion control system according to claim 12, further comprising:

and the network function entity is used for monitoring and acquiring network bandwidth information and sending the network bandwidth information to the sending end equipment, or sending the network bandwidth information to the receiving end equipment and sending the network bandwidth information to the sending end equipment through the receiving end equipment.

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