WO2012097737A1

WO2012097737A1 - Method and device for controlling data transmission

Info

Publication number: WO2012097737A1
Application number: PCT/CN2012/070547
Authority: WO
Inventors: 祝幼菁; 王辉; 郁春波; 谢华国; 蔡烈斌; 吴杰; 郭书蕾
Original assignee: 华为技术有限公司
Priority date: 2011-01-18
Filing date: 2012-01-18
Publication date: 2012-07-26
Also published as: CN102104908A; CN102104908B

Abstract

Disclosed are a method and a device for controlling data transmission, so as to improve wireless resource utilization. The method in the embodiment of the present invention includes: obtaining information about a strategy factor which includes at least one of information about sub-district congestion and user information about the user who is using a transport control protocol (TCP) service; adjusting a TCP congestion control parameter according to the information about the strategy factor, if a preset transmission control condition is satisfied; and controlling the data transmission rate of the user using the adjusted TCP congestion control parameter. Further provided is a device for controlling data transmission. The present invention is capable of improving wireless resource utilization effectively.

Description

The present invention claims the priority of the Chinese patent application filed on January 18, 2011, the Chinese Patent Application No. 201110020685.2, entitled "A Data Transmission Control Method and Apparatus", which The entire contents are incorporated herein by reference. Technical field

The present invention relates to the field of communications, and in particular, to a data transmission control method and device.

Background technique

With the popularization of smart phones and the continuous development of network services, the frequency of users accessing the Internet through wireless networks is getting higher and higher. This situation has a relatively large impact on wireless network air interface resources.

At the same time, the existing wireless network is very different from the traditional wired network. The quality of the air interface transmission is easily affected by various factors, so that the quality of the user's air interface transmission is good or bad, and the frequency and time of congestion of the user service. Both are higher than traditional wired networks.

In order to improve the resource utilization of the wireless network and improve the user experience, a congestion control protocol (TCP) control method is proposed in the prior art, which is used to pass the congestion control parameter pair when the TCP link is congested. The radio resources occupied by the user are adjusted to alleviate congestion.

In order to adapt to the needs of various networks, the TCP congestion control method in the prior art adopts a relatively general and conservative control strategy, which adopts a consistent processing regardless of the network to which the user is applied. In this way, the TCP congestion control method in the prior art lacks flexibility when targeting different networks, especially wireless networks, thereby affecting wireless resource utilization.

Summary of the invention

Embodiments of the present invention provide a data transmission control method and device, which can improve radio resource utilization.

In one aspect, a data transmission control method is provided, including: acquiring policy factor information, where the policy factor information includes at least one of cell congestion information and user information of a user who is using a transmission control protocol TCP service; Transmission control conditions, according to the policy The information information adjusts a TCP congestion control parameter; the data transmission rate of the user is controlled by using the adjusted TCP congestion control parameter.

In another aspect, a data transmission control method is provided, including: acquiring policy factor information, where the policy factor information includes at least one of cell congestion information and user information of a user who is using a Transmission Control Protocol (TCP) service; The policy factor information sets the TCP congestion control parameter; if the user initiates the TCP initial acceleration, the set data congestion control parameter is used to control the data transmission rate of the user.

In another aspect, a data transmission control device is provided, including: an acquiring unit, configured to acquire policy factor information, where the policy factor information includes at least one of cell congestion information and user information of a user who is using a transmission control protocol TCP service. An adjusting unit, configured to adjust a TCP congestion control parameter according to the policy factor information acquired by the acquiring unit when the preset transmission control condition is met; and a control unit, configured to adjust the TCP congestion control by using the adjusting unit The parameter controls the data transmission rate of the user.

In another aspect, a data transmission control device is provided, including: an acquiring unit, configured to acquire policy factor information, where the policy factor information includes at least one of cell congestion information and user information of a user who is using a transmission control protocol TCP service. a setting unit, configured to set a TCP congestion control parameter according to the policy factor information acquired by the acquiring unit, and a control unit, configured to: when the user initiates initial TCP acceleration, use a TCP congestion control parameter set by the setting unit The user's data transmission rate is controlled.

As can be seen from the above technical solutions, the embodiments of the present invention have the following advantages:

The embodiment of the present invention may obtain policy factor information including at least one of cell congestion information and user information of a user who is using the transmission control protocol TCP service. After obtaining the policy factor information, the policy factor information may be adjusted or set according to the policy factor information. The TCP congestion control parameter controls the data transmission rate of the user by using the adjusted TCP congestion control parameter or the set TCP congestion control parameter, so that the data transmission rate of the user can be controlled according to the actual situation of the wireless network, therefore, The data transmission control method in the embodiment of the invention can dynamically adjust the control strategy according to different wireless networks, thereby effectively improving the utilization of the wireless resources.

DRAWINGS

1 is a schematic diagram of an embodiment of a data transmission control method according to the present invention; 2 is a schematic diagram of another embodiment of a data transmission control method according to the present invention;

3 is a schematic diagram of a prior art TCP transmission optimization process;

4 is a schematic diagram of a TCP transmission optimization process according to the present invention;

FIG. 5 is another schematic diagram of a prior art TCP transmission optimization process;

6 is another schematic diagram of a TCP transmission optimization process according to the present invention;

7 is a schematic diagram of another embodiment of a data transmission control method according to the present invention;

8 is a schematic diagram of a prior art TCP initial acceleration process;

9 is a schematic diagram of a TCP initial acceleration process according to the present invention;

FIG. 10 is a schematic diagram of an embodiment of a data transmission control device according to the present invention; FIG.

11 is a schematic diagram of another embodiment of a data transmission control device according to the present invention;

12 is a schematic diagram of another embodiment of a data transmission control device according to the present invention;

FIG. 13 is a schematic diagram of another embodiment of a data transmission control device according to the present invention.

detailed description

Referring to FIG. 1, an embodiment of a data transmission control method of the present invention includes:

101. Acquire policy factor information;

In this embodiment, the data transmission control device may obtain policy factor information including at least one of cell congestion information and user information of a user who is using the TCP service.

For example, the data transmission control device may acquire the user information of the user when the user requests to use the TCP service, or obtain the user information of the user when the user accesses the network.

For another example, the data transmission control device can periodically acquire current cell congestion information, considering that the air interface status of the wireless network changes rapidly.

It should be noted that the specific manner of obtaining the policy factor information is not limited in the embodiment of the present invention. The cell congestion information and the user information in this embodiment may be obtained by any one of the actual requirements, or all of the two, which are not limited herein.

102. If the preset transmission control condition is met, adjust the TCP congestion control parameter according to the policy factor information. In this embodiment, when the data transmission control device detects that the preset transmission control condition is met, the TCP congestion control parameter may be adjusted according to the acquired policy factor information.

103. Control the data transmission rate of the user by using the adjusted TCP congestion control parameter. After the data transmission control device adjusts the TCP congestion control parameters, the adjusted

The TCP congestion control parameter controls the user's data transmission rate.

In this embodiment, at least one of the cell congestion information and the user information of the user who is using the transmission control protocol TCP service may be obtained. After obtaining the policy factor information, the TCP congestion control parameter may be adjusted according to the policy factor information, and the adjustment is used. The subsequent TCP congestion control parameter controls the data transmission rate of the user, so that the data transmission rate of the user can be controlled according to the actual situation of the wireless network, and the conservative control strategy is not used. Therefore, in the embodiment of the present invention, The data transmission control method can dynamically adjust the control strategy according to different wireless networks, thereby effectively improving the utilization of wireless resources.

The data transmission control method of the present invention is described in detail below. Referring to FIG. 2, another embodiment of the data transmission control method of the present invention includes:

201. Acquire policy factor information;

The policy factor information includes at least one of cell congestion information and user information of a user who is using the TCP service.

The user information in this embodiment may include, for example, user subscription information and the user's real-time information about the user subscription information, for example, may include at least one of a user priority and a user account opening rate, and the user real-time information may include, for example, a user. Real-time bandwidth, received signal code power, real-time distance between the user and the base station, and at least one of the user's real-time cache occupancy information.

The information about the cache occupancy in the embodiment may be the information of the cache occupancy (BO, Buffer Occupancy), or the number of bytes actually saved in the cache. The BO information is used as an example in the embodiment and the following embodiments.

In this embodiment, only the user information and the cell congestion information are used as examples of the policy factors. It can be understood that, besides the information, the policy factor information may also include other information, such as the total available bandwidth in the wireless network. The information such as the size of the cached data in the wireless network is not limited herein. For the same reason, more types of user information can be obtained in this embodiment, which is not limited herein.

In this embodiment, the policy factor information may be obtained by a Radio Network Controller (RNC), and the policy factor information may be obtained by the base station, or may be obtained by other network elements of the access network. For example, you can include:

(1), obtain the strategic factor information from R C:

(1.1) The process of obtaining user subscription information:

In this embodiment, the RNC may obtain the user subscription information of the user from the core network when the user accesses the network or when the user requests to use the TCP service.

Specifically, the RC may obtain user subscription information from a Serving GPRS Supporting Node (SGSN) or a Mobility Management Entity (MME), and the user subscription information may be obtained by a Home Location Register (HLR, Home Location Register ) is provided to the SGSN or MME.

The SGSN or the MME may directly send the user subscription information obtained from the HLR to the RNC, and may also perform adaptive adjustment on the user subscription information and send the information to the R C. The specific process is not limited.

It should be noted that, in this embodiment, only the SGSN or the MME provides the user subscription information as an example. In an actual application, if applied to different wireless networks, the user subscription information may also be provided by different core network devices.

(1.2) User real-time information acquisition process:

In this embodiment, R C may acquire real-time user information of the user from the base station.

It should be noted that the base station can perform real-time measurement on the user to obtain the real-time information of the user, and provide real-time information of the user to the RNC. In this embodiment, only the real-time information provided by the base station is used as an example for description. In practical applications, if Other network elements measure user real-time information of the user, and these network elements can also provide real-time user information to the RC.

The user real-time BO information in this embodiment may be a radio link control (RLC) buffer data size, and the RLC cache may be a sending queue. The more RLC cache data, the more the network congestion status may be. Seriously, the less RLC cache data, the more smooth the network.

The RLC cache can be located at the base station or at the RNC, so the RNC can acquire itself. The RLC cache data size may also receive the RLC cache data size from the base station as the user real-time information.

( 1.3 ) The process of acquiring cell congestion information:

In this embodiment, R C may acquire cell congestion information from the base station.

Specifically, the RNC may receive a capacity allocation control message sent by the base station, and obtain cell congestion information from the capacity allocation control message.

It should be noted that the base station can measure the cell congestion information of the cell where the user is located, and provide the cell congestion information to the RNC. In this embodiment, only the cell congestion information provided by the base station is used as an example for description. In practical applications, if The cell in which the user is located may be measured by other network elements, and the cell congestion information may also be provided by the network element to the RC.

(2), the base factor information is obtained by the base station:

(2.1) The process of obtaining user subscription information:

In this embodiment, the base station may obtain user subscription information of the user from the core network.

Specifically, the base station may obtain user subscription information from the SGSN or the 通过 through the R C, and the user subscription information may be provided by the HLR to the SGSN or the ΜΜΕ.

The SGSN or the MME may directly send the user subscription information that is obtained from the HLR to the base station through the RNC, and may also perform adaptive adjustment on the user subscription information and then send the information to the base station through the R C. The specific process is not limited.

(2.2) User real-time information acquisition process:

In this embodiment, the base station can perform real-time measurement on the user to obtain real-time information of the user.

(2.3) Process of obtaining cell congestion information:

In this embodiment, the base station may perform measurement on the cell where the user is located to obtain the cell congestion information. The foregoing description is made by taking the RC or the base station acquiring the policy factor information as an example. In practical applications, other networks may also be used. The process of acquiring the policy factor information is similar to the process of obtaining the policy factor information by the foregoing RNC or the base station, and details are not described herein again. 202. When the transmission control condition is met, adjust the TCP congestion control parameter according to the policy factor information.

In this embodiment, after obtaining the policy factor information, when the transmission control condition of each scenario is met, the RNC or the base station may adjust the TCP congestion control parameter in each scenario according to the policy factor information.

It should be noted that the data transmission control process in this embodiment may be completed by the RC, or may be completed by the base station. Except for the process of obtaining the policy factor information in step 201, the other processes are similar. The RNC is taken as an example for illustration.

The TCP congestion control parameters in this embodiment include at least one of congestion window information (cwnd, congesting window), congestion counter information snd_cwnd_cnt, and congestion threshold information ssthresh.

The specific scenarios in this embodiment, for example, can be divided into the following cases:

(1) TCP active congestion control:

In this embodiment, the RNC can predict whether TCP congestion will occur, thereby enabling active TCP congestion control.

Specifically, the RNC can obtain the cell congestion information or the real-time BO information of the user, and the cell congestion information or the real-time BO information of the user can indicate the congestion status of the cell. Generally, when the cell is congested, TCP congestion may be predicted. Therefore, the RNC can determine whether TCP congestion will occur according to the cell congestion information or the real-time BO information of the user, thereby enabling active TCP congestion control.

In this embodiment, when the cell congestion information received by the RNC or the real-time BO information of the user indicates that the cell is congested or the cell is not congested, it may be determined whether TCP congestion will occur, thereby determining that the transmission control in the scenario of the TCP active congestion control is satisfied. condition.

It should be noted that, in practical applications, the RNC may also predict the upcoming TCP congestion by other information or other means, that is, the transmission control conditions in the TCP active congestion control scenario may have other manifestations. The details are not limited herein.

In the scenario of TCP active congestion control, two control modes can be included:

(1) Speed reduction:

When the RNC determines that TCP congestion will occur, for example, when the received cell congestion information or the user real-time BO information indicates that the cell is congested, the RNC may lower the user's cwnd to avoid or Mitigating impending TCP congestion;

The RNC reduces the user's cwnd based on policy factor information, such as the user's user information. For example, the degree of reduction may be inversely proportional to at least one of a user's priority, a user's account opening rate, a user's real-time available bandwidth, and a user's received signal code power, and/or a real-time distance from the user to the base station and The user is proportional to at least one of the real-time cache occupancy information.

In this embodiment, for example, the RNC may specifically adjust the user's cwnd to: cwnd _new = ( 1- R% ) * cwnd ₀ , _d ;

Cwnd _new is the user's adjusted cwnd, cwnd _old is the user's pre-adjusted cwnd, R is the degree of reduction, and R is a real number greater than 0 and less than 100.

It should be noted that, in this embodiment, before the transmission control condition in the TCP active congestion control scenario is met, the value of the user's cwnd may follow the provisions of the existing TCP congestion control method, for example, may be request for comment (RPC, Request For Comments ) The content described in the 2581 file.

When the transmission control condition in the TCP active congestion control scenario is met, the RNC takes the user's current cwnd as cwnd _old .

The above adjustment is to reduce the user's congestion window. Since the size of the congestion window determines the amount of data that the user can send, the congestion window can be reduced to achieve the speed reduction.

In this embodiment, R may satisfy at least one of the following constraints:

The R is inversely proportional to the priority of the user, that is, the higher the priority, the lower the value of R, the lower the priority, and the higher the value of R;

The R can also be inversely proportional to the user's account opening rate, that is, the higher the account opening rate, the lower the R value, and the lower the account opening rate, the higher the R value;

The R can also be inversely proportional to the real-time available bandwidth of the user, that is, the higher the real-time available bandwidth, the lower the value of R, and the lower the real-time available bandwidth, the higher the value of R;

The R can also be inversely proportional to the power of the received signal of the user, that is, the higher the power of the received signal of the user, the lower the value of R, and the lower the power of the received signal of the user, the higher the value of R;

The R can also be proportional to the real-time distance between the user and the base station, that is, the larger the real-time distance is, the larger the value of R is, and the smaller the real-time distance is, the lower the value of R is;

The R can also be directly proportional to the user's real-time BO information, that is, the user's real-time BO information is larger, R's The larger the value, the smaller the real-time BO information of the user, and the smaller the value of R.

It should be noted that the foregoing constraint conditions are only specific examples in the embodiment. In actual applications, the adjustment may be performed according to actual requirements, which is not limited herein, as long as the value of R is adjusted according to user information. .

For ease of understanding, the following is a specific example:

Taking the user priority as an example, it is assumed that the user is divided into three levels: the gold user, the silver user, and the bronze user. The user priority in this embodiment may be the user's priority (ARP, Allocation/Retention Priority). It can be other priority information, which is not limited here.

Among them, the value of R corresponding to the gold medal user is 15, the value of R corresponding to the silver card user is 30, and the value of R corresponding to the bronze card user is 50.

Suppose the cwnd of these three types of users. _Ld is 30. In the case of speed reduction, the gold user's cwnd _{new is} adjusted to 30-30* 15%=25.5, the silver user's cwnd _{new is} adjusted to 30-30*30%=21, and the bronze user's cwnd _{new is} adjusted to 30-30*50%=15

Since cwnd is an integer, if the adjusted cwnd _new is not an integer, it can be rounded off or rounded directly.

In this embodiment, if the cwnd _{new is} directly rounded, it is equivalent to discarding the fractional part. Since the cndd is greater than or equal to ssthresh when cwnd exceeds ssthresh, the adjusted cwnd _{new is} greater than or equal to ssthresh. You can reduce snd-cwnd-cnt to compensate for the fractional part of cwnd discarding. Specifically, you can:

_{snd- cwnd- cnt = snd- cwnd- cnt old} - cwnd new * ((cwnd * R) mod 100) div 100

Where snd_cwnd-cnt _new is the user's adjusted snd-cwnd-cnt, snd-cwnd-cnt _w is the user's pre-adjusted snd-cwnd-cnt, "mod 100" means "modulo 100", "div 100" means "divide by 100".

It should be noted that, in this embodiment, before the transmission control condition in the TCP active congestion control scenario is met, the value of the snd_cwnd_cnt of the user may follow the provisions of the existing TCP congestion control method, for example, may be an RFC 2581 file. The content described in .

When the transmission control conditions in the TCP active congestion control scenario are met, the RNC will present the user's current Snd_cwnd—cnt as snd_c wnd_cnt ₀ , _{d 0}

15 after the assumed ssthresh, then cwnd _new user adjusts the gold is greater than ssthresh, since the cwnd _new user to adjust the gold is not an integer, then rounding will cause fractional part is discarded and the adjustment is not accurate enough, it is possible to adjust snd- cwnd_ nt, it is assumed that Gold user's snd-cwnd- cnt. _{The ld} is 24, and the snd-cwnd-cnt _new after the adjustment of the shell ¹ J is: snd_cwnd_cnt _new = 24-25.5 * ( ( 25.5* 15 mod 100 ) div 100=24-25.5*82.5 div 100=3.

The specific numerical values provided in this embodiment are only an example. In practical applications, other numerical values may be used, which are not limited herein.

(2) Speed up:

When R C determines that TCP congestion does not occur, for example, when the received cell congestion information or the user real-time BO information indicates that the cell is not congested, the RNC can improve the user's cwnd to improve data transmission efficiency;

The RNC raises the user's cwnd based on policy factor information, such as the user's user information. For example, the degree of improvement is proportional to at least one of the user's priority, the user's account opening rate, the user's real-time available bandwidth, and the user's received signal code power, and/or the real-time distance from the user to the base station and the user At least one of the real-time cache occupancy information is inversely proportional.

In this embodiment, the RC specifically adjusts the user's cwnd to: cwnd _new = (1+ R%)

Cwnd _new is the user's adjusted cwnd, cwnd _old is the user's pre-adjustment cwnd, R is the degree of improvement, and R is a real number greater than 0.

It should be noted that, in this embodiment, before the transmission control condition in the TCP active congestion control scenario is met, the value of the user's cwnd may follow the provisions of the existing TCP congestion control method, for example, as described in the RFC 2581 file. Content.

When the transmission control condition in the TCP active congestion control scenario is satisfied, the RNC takes the user's current cwnd as cwnd ₀ i _d .

The above adjustment is to increase the user's congestion window. Since the size of the congestion window determines the amount of data that the user can send, the congestion window can be increased to achieve the speed increase.

R may satisfy at least one of the following constraints:

The R is proportional to the priority of the user, that is, the higher the priority, the higher the value of R, the higher the priority Low, the lower the value of R;

The R can also be proportional to the user's account opening rate, that is, the higher the account opening rate, the higher the R value, the lower the account opening rate, and the lower the R value;

The R can also be proportional to the real-time available bandwidth of the user, that is, the higher the real-time available bandwidth, the higher the value of R, the lower the real-time available bandwidth, and the lower the value of R;

The R can also be proportional to the user's received signal code power, that is, the higher the user's received signal code power, the higher the R value, the lower the user's received signal code power, and the lower the R value;

The R can also be inversely proportional to the real-time distance between the user and the base station, that is, the larger the real-time distance, the smaller the value of R, and the smaller the real-time distance, the larger the value of R;

The R can also be inversely proportional to the real-time BO information of the user, that is, the larger the real-time BO information of the user, the smaller the value of R, the smaller the real-time BO information of the user, and the larger the value of R.

It should be noted that the foregoing constraint is only a specific example in the embodiment. In actual applications, the adjustment may be performed according to actual requirements, which is not limited herein, as long as the value of R is adjusted according to user information. can.

For ease of understanding, the following is a specific example:

Taking the user priority as an example, it is assumed that there are three levels of users: the gold user, the silver user, and the bronze user. The user priority in this embodiment can be the user's ARP or other priority information. Not limited.

Among them, the value of R corresponding to the gold medal user is 75, the value of R corresponding to the silver medal user is 50, and the value of R corresponding to the bronze medal user is 25.

Suppose the cwnd of these three types of users. _Ld is 10, in the case of speed increase, the gold user's cwnd _{new is} adjusted to 10+10*75%-17.5, the silver user's cwnd _{new is} adjusted to 10+10*50%=15, and the bronze user's cwnd _{new is} adjusted to 10+10*25%=12.5.

In this embodiment, if the cwnd _{new is} directly rounded, it is equivalent to discarding the fractional part. Since the cndd is greater than or equal to ssthresh when cwnd exceeds ssthresh, the adjusted cwnd _{new is} greater than or equal to ssthresh. You can increase snd_cwnd-cnt to compensate for the fractional part of cwnd. Specifically, you can: Snd— cwnd— cnt _new = snd— cwnd— cnt i _d + cwnd _new * ( ( cwnd * R ) mod 100 ) div 100

Where snd_cwnd-cnt _new is the user's adjusted snd-cwnd-cnt, snd-cwnd-cnt _old is the user's pre-adjusted snd-cwnd-cnt, "mod 100" means "modulo 100""div 100 "Express" is divided by 100 and rounded up.

It should be noted that, in this embodiment, before the transmission control condition in the TCP active congestion control scenario is met, the value of the snd_cwnd-cnt of the user may follow the provisions of the existing TCP congestion control method, for example, may be an RFC. Content described in the 2581 document.

When the transmission control condition in the TCP active congestion control scenario is satisfied, the RC takes the user's current snd-cwnd_cnt as snd-cwnd-cnt _old

Assuming ssthresh is 15, the adjusted cwnd _new of the gold user is greater than ssthresh. Since the adjusted cwnd _{new of the} gold user is not an integer, the decimal part will be discarded after the rounding and the adjustment is not accurate enough, so the snd_cwnd-cnt can be adjusted, assuming the gold medal User's snd—cwnd—cnt. _ld is 3, then adjusted snd- cwnd- cnt _new _{is: snd- cwnd- cnt new = 3 +} 17.5 * ((17.5 * 75 mod 100) div 100 = 3 + 17.5 * 12 div 100 = 5

It should be noted that the TCP congestion control in the prior art can only trigger the TCP congestion control when the data transmission timeout is received, or when three repeated acknowledgement messages (ACK) are received, but the actual congestion has occurred at this time. It is easy to make congestion control not timely enough.

In this embodiment, the RC may determine whether TCP congestion will occur according to the cell congestion information or the real-time BO information of the user, and the congestion of the cell is often before the TCP congestion, so the TCP congestion may be predicted, thereby effectively performing TCP congestion. control.

In this embodiment, the specific calculation formula for the cwnd used for the speed reduction and the speed increase is only an example, and other calculation formulas may be used in the actual application, as long as the cwnd is adjusted according to the user information, the specific formula This is not a limitation.

(2) TCP retransmission congestion:

When a user sends a packet to the receiving end, the receiving end does not receive any packet and can process it immediately. It may need to wait for a segment to be received before processing. In the segment. If the packet has a certain order, the segment X includes the packet 1 to the packet 10. After receiving the 10 packets, the receiving end can perform subsequent processing.

However, when a network fault occurs or a user surge occurs, the transmission of the packet may be affected. As a result, the first sent packet may not arrive first, and some packets may be lost.

If the packet sent by the user to the receiving end is successfully received by the receiving end, the receiving end will feed back an ACK corresponding to the packet, and if the receiving end receives an out-of-order text (for example, the receiving end has received the packet 1 and reported Text 2, but the next received is not the message 3, but other messages), it will send a duplicate ACK, the duplicate ACK is the same as the previous ACK, the duplicate ACK contains the desired 艮艮The serial number.

For example, the user sequentially sends the message in the segment X to the receiving end, and after sending two messages, the user receives the ACK1 for the message 1 and the ACK2 for the message 2, and the user sends the message. 3, after message 4, message 5, message 6, after the user receives 3 ACK2 consecutively, and the 3 ACK2 contains the expected message sequence number is "3", the user knows that the message 3 is not received. The terminal successfully receives, thereby determining that the network may be congested.

When the user receives 3 duplicate ACKs, it indicates that the network may be congested, and the congestion determined by receiving the three repeated ACKs is TCP retransmission congestion.

When the user receives three repeated ACKs, it determines that the transmission control condition in the TCP retransmission congestion scenario is met, and the RNC may reduce cwnd to reduce the network according to at least one of policy factor information, such as cell congestion information and user information. Congested data, assuming max-cwnd is 35, and the receiving window (rwnd, receiving window) is 32.

The maximum cwnd allowed by the user is determined by the smaller of max_cwnd and rwnd, so the maximum cwnd allowed by the user is 32, and the threshold ssthresh_^: can take half of the maximum cwnd allowed by the user. Is 16.

Among them, max_cwnd is the maximum congestion window information, and max_cwnd is calculated by the maximum receiving window information max_rwnd, user bandwidth and TCP round-trip time of the receiving end. The specific calculation process is not limited here.

Rwnd is the receiving window of the receiver, which can be determined by the size of the buffer of the receiver, and is not limited herein. Firstly, the processing method of the TCP congestion control method in the prior art (for example, the method described in the RFC 2581 file) in the case of TCP retransmission congestion is analyzed:

For details, refer to FIG. 3. The TCP retransmission process in the prior art is started from A. Before A, the user's cwnd is 32 and ssthresh is 16. When the user receives 3 duplicate ACKs at A, that is, it is determined that TCP retransmission congestion occurs, the RNC will adjust ssthresh to half of the current cwnd, that is, half of 32, and ssthresh is still 16 after adjustment, and then Cwnd is adjusted to ssthresh+3, and Bay' J cwnd is adjusted to 16+3=19, that is, from A to F.

After receiving the F, the user will increment the cwnd by 1 for each repeated ACK, that is, from F to G.

According to the principle of "conservation of data packets", the number of packets in the network at the same time is constant. Therefore, each time a receiver receives a message, it means that one packet is reduced in the network. That is, the user can Send another message.

The process of transmitting the segment X by the user is still taken as an example: When the user receives 3 repeated ACK2, the ssthresh of the user is adjusted to 16, cwnd is adjusted to 19, and then if the user receives the ACK2 again If the receiving end receives another message, the user's cwnd can be incremented by one, and the message continues to be sent. The user needs to retransmit the lost message 3 to the receiving end at this stage, so the cwnd increase can speed up the retransmission. .

When arriving at G, if you receive an ACK for the next data, cwnd will be changed to the same as ssthresh, that is, 16, from G to H.

When the user receives the ACK of the next data, it indicates that the receiver has successfully received the packet that has not been received before, and the user does not need to perform retransmission. To avoid causing new congestion, the user's cwnd can be returned to ssthresh. Enter the congestion avoidance phase.

The process of sending the segment X by the user is still taken as an example: after the user receives several repeated ACK2s and receives the ACK3, it indicates that the receiving end has received the previously lost packet 3, and the user does not need to After retransmission, in order to avoid causing new congestion, the user's cwnd can be transferred back to ssthresh to enter the congestion avoidance phase.

The process from H to I is the congestion avoidance phase.

The snd-cwnd-cnt is introduced in the congestion avoidance phase. This parameter is used to slow down the growth rate of cwnd. At this time, cwnd grows linearly, that is, from H to I, and when it reaches I, the user's current cwnd. Already equal to the maximum cwnd allowed by the user, keep cwnd unchanged, that is, after cwnd reaches 32, if there is no congestion, the value of cwnd will remain at 32.

Next, the processing method of the data transmission control method in this embodiment when TCP retransmission congestion occurs is analyzed:

In this embodiment, when the user receives three repeated ACKs, it is determined that TCP retransmission congestion occurs. To reduce data congested in the network, the RNC may perform at least according to policy factor information, such as cell congestion information and user information. One, lowering the user's cwnd and ssthresh;

For example, the degree of cwnd and ssthresh reduction is inversely proportional to at least one of the user's priority, the user's account opening rate, the user's real-time available bandwidth, and the user's received signal code power, and/or, and the real time between the user and the base station. The distance, the degree of congestion indicated by the cell congestion information, and at least one of the user real-time cache occupancy information are proportional.

Specifically, when TCP retransmission congestion occurs, the RNC can adjust the user's cwnd and ssthresh as follows:

Cwnd _new = ( 1 - X% ) * cwnd _old ;

Ssthresh _n e _W = ( 1- Y% ) * ssthresh _old ;

Cwnd _new is the user's adjusted cwnd, cwnd _old is the user's pre-adjusted cwnd, ssthresh _n ew is the user's adjusted ssthresh, ssthresh. _Ld is the user's pre-adjusted ssthresh, X and Y indicate the degree of reduction, X, Y are real numbers greater than or equal to 0, and less than 100.

It should be noted that, in this embodiment, before the transmission control condition in the TCP retransmission congestion scenario is met, the value of the user's cwnd and ssthresh may follow the provisions of the existing TCP congestion control method, for example, may be an RFC 2581 file. The content described in .

When the transmission control condition in the TCP retransmission congestion scenario is satisfied, the RNC takes the user's current cwnd as cwnd. _Ld , and the user's current ssthresh as ssthresh. _w .

X, Y can satisfy at least one of the following constraints:

The X, Y is proportional to the degree of congestion indicated by the cell congestion information, that is, the higher the congestion degree, the higher the value of X, Y, the lower the congestion degree, and the lower the value of X, Y;

The X, Y can also be inversely proportional to the priority of the user, that is, the higher the priority of the user, the lower the value of X, Y, the lower the priority of the user, and the higher the value of X and Y;

The X, Y can also be inversely proportional to the user's account opening rate, that is, the higher the user's account opening rate, X, The lower the value of Y, the lower the user's account opening rate, and the higher the value of X, Υ;

The X, Υ can also be inversely proportional to the user's real-time available bandwidth, that is, the higher the user's real-time available bandwidth, the lower the value of X, Υ, the lower the user's real-time available bandwidth, the higher the value of X, Υ; , Υ can also be inversely proportional to the user's received signal code power, that is, the higher the user's received signal code power, the lower the value of X, Υ, the lower the user's received signal code power, the higher the X, Υ value;

The X, Υ can also be proportional to the real-time distance between the user and the base station, that is, the greater the real-time distance, the larger the value of X, Υ, the smaller the real-time distance, the smaller the value of X, Υ;

The X, Υ can also be proportional to the user's real-time ΒΟ information, that is, the user's real-time ΒΟ information is larger, the larger the value of X, Υ, the smaller the user's real-time ΒΟ information, the smaller the value of X and Υ.

It should be noted that the foregoing constraint is only a specific example in the embodiment. In actual applications, the adjustment may be performed according to actual requirements, which is not limited herein, as long as it is based on at least one of cell congestion information and user information. Adjust the values of X and Υ.

For ease of understanding, the following is a specific example:

Among them, the value of X corresponding to the gold medal user is 0, the value of Υ is 0, the value of X corresponding to the silver card user is 25, the value of Υ is 0, the value of X corresponding to the bronze user is 35, and the value of Υ is 30.

If you further consider the degree of congestion in the cell, Bay' j:

When the cell is not congested, the value of X for the gold medal user is 25, the value of Y is 15, the value of X for the silver card user is 40, the value of Y is 30, and the value of X for the bronze card user is 45, Y. The value is 40.

When the cell is congested, the value of X for the gold medal user is 35, the value of Y is 20, the value of X for the silver card user is 45, the value of Y is 35, and the value of X for the bronze card user is 55, the value of Y. Is 50.

The following describes the processing mode when TCP retransmission congestion occurs in this embodiment with reference to FIG. 4. In this embodiment, a user has a cwnd of 32 and a ssthresh of 19 (for example, ssthreshl in FIG. 4). When the user receives 3 duplicate ACKs at A, it is determined that TCP has occurred. After retransmitting the congestion, the RNC adjusts the user's cwnd and ssthresh according to the policy factor information. Suppose the user adjusted ssthresh _new is 16 (as in ssthresh2 in Figure 4), and the adjusted cwnd _new is 29, then the user's cwnd will arrive at point B from point A.

After arriving at B, each time the user receives a duplicate ACK, cwnd will increase by 1. If the user receives 2 duplicate ACKs, cwnd will increase to 31, that is, from B to C.

When the user arrives at C, if the user receives the ACK of the next data, the user does not need to perform retransmission. In order to avoid causing new congestion, the RNC can reduce the user's cwnd according to the policy factor information, assuming that the reduced cwnd is 28 , that is, from C to D.

The process from D to E is the congestion avoidance phase, which will not be described here.

In this embodiment, the specific calculation formulas for cwnd and ssthresh are only an example. In practice, other calculation formulas may be used, as long as the cwnd and ssthresh are adjusted according to at least one of the cell congestion information and the user information. For example, in practical applications, the following methods can also be used:

When the user receives three repeated ACKs, it determines that the transmission control condition in the TCP retransmission congestion scenario is satisfied. At this time,

If the cell is not congested:

For gold users: cwnd remains unchanged, when ssthresh is less than cwnd, ssthresh remains unchanged;

As shown in Figure 4, when the user receives 3 duplicate ACKs, the user has cwnd of 32 and ssthresh of 16. If the cell is not congested and the user is a gold card user, the user's cwnd is still 32, ssthresh is still Is 16.

For silver users: cwnd is adjusted to the median between the original value and the adjusted value of the prior art. When ssthresh 'J, at cwnd, ssthresh remains unchanged;

As shown in FIG. 4, when the user receives 3 repeated ACKs, the user has a cwnd of 32 and ssthresh of 16. According to the manner described in the foregoing prior art, the user's cwnd is adjusted to 19, ssthresh. It will be adjusted to 16, but in this embodiment, if the cell is not congested and the user is a silver card user, the user's cwnd is adjusted to (32+19) /2, and ssthresh is still 16.

For Bronze users: Adjust cwnd and ssthresh according to the prior art.

As shown in Figure 4, when the user receives 3 duplicate ACKs, the user's cwnd is 32, ssthresh If the user is a bronze user, the user's cwnd is adjusted to 19 and the ssthresh is adjusted to 16. In this embodiment, if the cell is not congested and the user is a bronze user, The user's cwnd and ssthresh are adjusted in the manner described in the previous prior art.

If the cell is congested:

For gold users: cwnd is adjusted to the median between the original value and the prior art adjusted value. When ssthresh is less than cwnd, ssthresh remains unchanged;

As shown in FIG. 4, when the user receives 3 repeated ACKs, the user has a cwnd of 32 and ssthresh of 16. According to the manner described in the foregoing prior art, the user's cwnd is adjusted to 19, ssthresh. It will be adjusted to 16, but in this embodiment, if the cell is congested and the user is a gold card user, the user's cwnd is adjusted to (32+19) 12, and ssthresh is still 16.

For Silver users: Adjust cwnd and ssthresh according to the prior art;

As shown in FIG. 4, when the user receives 3 repeated ACKs, the user has a cwnd of 32 and ssthresh of 16. According to the manner described in the foregoing prior art, the user's cwnd is adjusted to 19, ssthresh. It will be adjusted to 16. In this embodiment, if the cell is not congested and the user is a silver card user, the user's cwnd and ssthresh are adjusted in the manner described in the foregoing prior art.

For Bronze users: Adjust cwnd and ssthresh according to the prior art.

As shown in FIG. 4, when the user receives 3 repeated ACKs, the user has a cwnd of 32 and ssthresh of 16. According to the manner described in the foregoing prior art, the user's cwnd is adjusted to 19, ssthresh. It will be adjusted to 16. In this embodiment, if the cell is not congested and the user is a Bronze user, the user's cwnd and ssthresh are adjusted in the manner described in the foregoing prior art.

(3) TCP timeout congestion:

When the user's TCP transmission timer expires, the network has experienced severe congestion, and the congestion determined by the TCP transmission timer timeout is TCP timeout congestion.

When the user's TCP transmission timer expires, it is determined that the transmission control condition in the TCP timeout congestion scenario is satisfied, and the RNC can reduce the cwnd according to the policy factor information, such as user information, to reduce the congestion data in the network. For details, refer to FIG. 5 . The meanings of the specific parameters in FIG. 5 have been described above, and are not described herein again.

First, analyze the processing method of the TCP congestion control method in the prior art (such as the method described in the RFC 2581 file) when TCP timeout congestion occurs: In the prior art, when cwnd is 32, if the user finds that the TCP transmission timer expires at J, it is determined that TCP timeout congestion occurs, and the RNC will directly configure cwnd to 1, that is, from J to M, and enter slow start. In the phase, it reaches the congestion avoidance phase after reaching M at M, and will not be described here.

Next, the processing method of the data transmission control method in this embodiment when TCP timeout congestion occurs is analyzed:

In this embodiment, when the TCP transmission timer of the user times out, it is determined that TCP timeout congestion occurs. To reduce the congestion data in the network, the RNC may reduce the user's cwnd according to the policy factor information, such as user information.

For example, the degree of reduction is proportional to at least one of the user's priority, the user's account opening rate, the user's real-time available bandwidth, and the user's received signal code power, and/or the real-time distance from the user to the base station and the user At least one of the real-time cache occupancy information is inversely proportional.

For example, when TCP timeout congestion occurs, the RNC can adjust the user's cwnd as follows: cwnd _new = ( 1- K% ) *cwnd _old ;

Cwnd _n e _W is the user's adjusted cwnd, cwnd ₀ , _d is the user's pre-adjustment cwnd, K is the degree of reduction, and K is a real number greater than 0 and less than 100.

It should be noted that, in this embodiment, before the transmission control condition in the TCP timeout congestion scenario is met, the value of the user's cwnd may follow the provisions of the existing TCP congestion control method, for example, as described in the RFC 2581 file. content.

When the transmission control condition in the TCP timeout congestion scenario is met, the RNC takes the user's current cwnd as cwnd _oW .

K can satisfy at least one of the following constraints:

The K can also be inversely proportional to the priority of the user, that is, the higher the priority of the user, the lower the value of K, and the lower the priority of the user, the higher the value of K;

The K can also be inversely proportional to the user's account opening rate, that is, the higher the user's account opening rate, the lower the value of K, and the lower the user's account opening rate, the higher the value of K;

The K can also be inversely proportional to the user's real-time available bandwidth, that is, the higher the real-time available bandwidth of the user, the lower the value of K, and the lower the real-time available bandwidth of the user, the higher the value of K;

The K can also be inversely proportional to the power of the received signal of the user, that is, the higher the power of the received signal of the user, the lower the value of K, and the lower the power of the received signal of the user, the higher the value of K; The K can also be proportional to the real-time distance between the user and the base station, that is, the greater the real-time distance, the larger the value of Κ, the smaller the real-time distance, and the smaller the value of Κ;

The Κ can also be proportional to the user's real-time ΒΟ information, that is, the user's real-time ΒΟ information is larger, the larger the Κ value, the smaller the user's real-time ΒΟ information, the smaller the Κ value.

It should be noted that the foregoing constraint conditions are only specific examples in the embodiment. In actual applications, the adjustment may be performed according to actual requirements, which is not limited herein, as long as the value of the user is adjusted according to user information. .

For ease of understanding, the following is a specific example:

The following describes the processing mode when TCP timeout congestion occurs in this embodiment:

Taking the user priority as an example, the user is divided into three levels of users: a gold user, a silver card user, and a bronze card user. The user priority in this embodiment may be the user's ARP or other priority information. This is not a limitation.

Among them, the value of K corresponding to the gold medal user is 20, the value of K corresponding to the silver medal user is 40, and the value of K corresponding to the bronze medal user is 60.

The following is an example with reference to Figure 6:

Referring to FIG. 6, in this embodiment, when the user finds that the TCP transmission timer expires at J, it is determined that TCP timeout congestion has occurred, and the RC may lower the cwnd of the user according to the user information, assuming that the user reduces the cwnd _new At 23, adjust cwnd to 23, that is, from J to K.

The congestion avoidance phase is from K to L, and will not be described here.

In this embodiment, the specific calculation formula of cwnd is only an example. In the actual application, other calculation formulas may be used, as long as the cwnd is adjusted according to the user information, and the specific formula is not limited herein.

In this embodiment, different scenarios are described by only the above three examples. In practical applications, if there are other scenarios related to TCP congestion control, the TCP congestion control parameters can be adjusted in a similar manner.

203. Control the data transmission rate of the user by using a TCP congestion control parameter.

In this embodiment, after the TCP congestion control parameters in each scenario are adjusted, the adjusted data transmission rate of the user may be controlled by using the adjusted TCP congestion control parameter, specifically:

(1) TCP active congestion control: When it is determined that TCP congestion will occur, for example, when the cell congestion information indicates that the cell is congested, the rate at which the user transmits data may be contending according to the adjusted cwnd _new or cwnd _new and snd_cwnd_cnt _new P.

When it is determined that TCP congestion does not occur, for example, when the cell congestion information indicates that the cell is not congested, the rate at which the user transmits data may be increased according to the adjusted cwnd _new or cwnd _new and snd_cwnd_cnt _new .

In this embodiment, after cwnd _new and snd_cwnd_cnt _{new are known} , the process of reducing or increasing the rate at which the user transmits data according to cwnd _new or cwnd _n e _W and snd-cwnd-cnt _new is not limited.

(2) TCP retransmission congestion:

When the user receives 3 repeated ACKs, the rate at which the user sends data can be reduced according to the adjusted cwnd _new .

In this embodiment, after cwnd _{new is} known, the process of reducing the rate at which the user sends data according to cwnd _new is not limited.

(3) TCP timeout congestion:

When the user's TCP transmission timer expires, the rate at which the user can send data according to the adjusted cwnd _new P can be low.

The embodiment may obtain policy factor information including at least one of cell congestion information and user information of a user who is using the transmission control protocol TCP service. After obtaining the policy factor information, the TCP congestion control may be adjusted according to the policy factor information. Parameters, and use the adjusted TCP congestion control parameters to control the user's data transmission rate, so that the user's data transmission rate can be controlled according to the actual situation of the wireless network, and not only the conservative control state adjustment is used. Control strategy to effectively improve wireless resource utilization.

Referring to FIG. 7, another embodiment of the data transmission method of the present invention includes:

701. Obtain policy factor information.

In this embodiment, the data transmission control device can obtain the policy factor information, and the policy factor The information includes at least one of cell congestion information and user information of a user who is using the TCP service.

The cell congestion information and the user information in this embodiment may be obtained by any one of the actual requirements, or all of the two, which are not limited herein.

In this embodiment, the manner in which the data transmission control device obtains the policy factor information is similar to the manner in which the data transmission control device in the foregoing embodiment of FIG. 2 obtains the policy factor information, and details are not described herein again.

702. Set a TCP congestion control parameter according to the policy factor information.

In this embodiment, the data transmission control device may set the TCP congestion control parameter by using the acquired policy factor information.

Specifically, the data transmission control device may set an initial value of the user's cwnd at the time of initial TCP acceleration according to at least one of the cell congestion information and the user information.

The set initial value of cwnd is proportional to at least one of a user's priority, a user's account opening rate, a user's real-time available bandwidth, and a user's received signal code power, and/or a real-time distance from the user to the base station, the cell The degree of congestion indicated by the congestion information and the at least one of the user real-time cache occupancy information are inversely proportional.

Specifically, the initial value of the user's cwnd can be set as follows when the TCP is initially accelerated: cwnd initial value = max - cwnd * M%;

The meaning of max_cwnd is the same as that of max-cwnd described above, and will not be described here. M is a real number greater than 0 and less than or equal to 100.

M can satisfy at least one of the following constraints:

The M is inversely proportional to the degree of congestion indicated by the cell congestion information, that is, the higher the congestion degree, the lower the value of M, the lower the congestion degree, and the higher the value of M;

The M can also be proportional to the priority of the user, that is, the higher the priority of the user, the higher the value of M, the lower the priority of the user, and the lower the value of M; The M can also be proportional to the user's account opening rate, that is, the higher the user's account opening rate, the higher the value of M, the lower the user's account opening rate, and the lower the value of M;

The M can also be proportional to the real-time available bandwidth of the user, that is, the higher the real-time available bandwidth of the user, the higher the value of M, the lower the real-time available bandwidth of the user, and the lower the value of M;

The M can also be proportional to the user's received signal code power, that is, the higher the user's received signal code power, the higher the value of M, the lower the user's received signal code power, and the lower the value of M;

The M can also be inversely proportional to the real-time distance between the user and the base station, that is, the larger the real-time distance, the smaller the value of M, and the smaller the real-time distance, the larger the value of M;

The M can also be inversely proportional to the real-time BO information of the user, that is, the larger the real-time BO information of the user, the smaller the value of M, and the smaller the real-time BO information of the user, the larger the value of M.

It should be noted that the foregoing constraint is only a specific example in the embodiment. In actual applications, the adjustment may be performed according to actual requirements, which is not limited herein, as long as it is based on at least one of cell congestion information and user information. Set the value of M.

703. If the initial TCP acceleration is started, the data transmission rate of the user is controlled by using the set TCP congestion control parameter.

After the data transmission control device sets the TCP congestion control parameter according to the acquired policy factor information, if the user initiates the initial TCP acceleration, the data transmission control device can control the data transmission rate of the user by using the set TCP congestion control parameter.

Specifically, in this embodiment, the data transmission rate of the user during initial TCP acceleration may be controlled according to the initial value of cwnd set in step 702.

In this embodiment, after the initial value of cwnd is known, the process of controlling the data transmission rate of the user according to the initial value of cwnd is not limited.

In this embodiment, at least one of the cell congestion information and the user information of the user who is using the transmission control protocol TCP service may be obtained. After obtaining the policy factor information, the TCP congestion control parameter may be set according to the policy factor information, and the setting is used. The TCP congestion control parameter controls the data transmission rate of the user, so that the data transmission rate of the user can be controlled according to the actual situation of the wireless network, and the conservative control strategy is not used. Therefore, in the embodiment of the present invention, The data transmission control method can dynamically adjust the control strategy according to different wireless networks, thereby effectively improving the utilization of wireless resources. For ease of understanding, the following is a specific example, please refer to Figure 8 and Figure 9:

The user can start the initial TCP acceleration when the TCP service is used. The meanings of the parameters such as max-cwnd, rwnd, and ssthresh in this embodiment are the same as those described in the foregoing embodiment shown in Figure 3, and are not described here.

First, the TCP congestion control method (such as the method described in the RFC 2581 file) in the prior art is analyzed in the initial acceleration of TCP:

Referring to FIG. 8, the initial TCP acceleration process in the prior art is started from A, and the RNC sets the initial value of the user's cwnd to 1, wherein the process from A to B is a slow start process, in which the user receives each To an ACK, cwnd is incremented by 1, that is, from A to B.

When it reaches B, cwnd increases to equal ssthresh, then enters the congestion avoidance phase. In order to avoid congestion, snd-cwnd-cnt is introduced. This parameter is used to slow down the growth rate of cwnd. At this time, cwnd grows linearly. From B to C, when the C is reached, the user's current cwnd is equal to the maximum cwnd allowed by the user, then cwnd is kept unchanged, that is, after cwnd reaches 32, if there is no congestion, the value of cwnd Will stay at 32.

Next, the processing method of the data transmission control method in the present embodiment when TCP initial acceleration occurs is analyzed:

In this embodiment, the user priority is taken as an example, and the user is divided into three levels of users: a gold medal user, a silver card user, and a bronze card user. The user priority in this embodiment may be the user's ARP or other priorities. The information is not limited here.

According to the description in step 702 of the embodiment shown in Fig. 7, the value of M corresponding to the gold medal user is 75, the value of M corresponding to the soap user is 50, and the value of M corresponding to the bronze user is 25.

If you want to further consider the degree of congestion in the community, then

When the cell is not congested, the value of M corresponding to the gold medal user is 75, the value of M corresponding to the silver card user is 50, and the value of M corresponding to the bronze card user is 25;

When the cell is congested, the value of M for the gold medal user is 50, the value of M for the silver card user is 25, and the value of M for the bronze card user is 15.

The following is an example with reference to Figure 9:

Referring to FIG. 9, it is assumed that in this embodiment, the RC is based on policy factor information, such as cell congestion. At least one of the information and the user information sets the initial value of a user's cwnd to 23, and the initial TCP acceleration process starts from D, and cwnd is 23. Since cwnd is greater than ssthresh at this time, the slow start phase is skipped and the direct entry is made. Congestion avoidance phase.

When arriving at E from D, the user's current cwnd is equal to the maximum cwnd allowed by the user, then cwnd is kept unchanged, that is, after cwnd reaches 32, if there is no congestion, the value of cwnd will remain at 32. .

In this embodiment, the calculation formula of the specific cwnd initial value used is only an example, and other calculation formulas may be used in practical applications, as long as the initial value of cwnd is set according to at least one of the congestion degree of the cell and the user information. Yes, the specific formula is not limited here.

The above embodiment describes the data transmission control method of the present invention. The data transmission control method in the above embodiment can be applied to various types of networks, such as: a second generation communication network, or a third generation communication network, or a long term evolution ( LTE, Long Term Evolution) Network, the execution flow in different networks is similar.

Among them, the second generation communication network includes a Global System for Mobile Communications (GSM) network; the third generation communication network includes a Wideband Code Division Multiple Access network.

It should be noted that, since the architectures of the various networks may be different, when the data transmission control method of this embodiment is applied to different types of networks, the execution procedures of the method flows are different, for example, in the GSM network and the WCDMA network. The flow of the data transmission control method of this embodiment may be performed by an RC or a base station (NodeB).

In the LTE network, the function of the RNC has been transferred to the evolved base station (eNodeB) for the purpose of the flattening of the network. Therefore, in the LTE network, the data transmission control method procedure of this embodiment may be performed by the evolved base station ( eNodeB) Execution.

The specific execution subject of the data transmission control method in this embodiment is not limited herein.

The following describes the data transmission control device in the embodiment of the present invention. Referring to FIG. 10, an embodiment of the data transmission control device of the present invention includes:

The obtaining unit 1001 is configured to acquire policy factor information, where the policy factor information includes at least one of cell congestion information and user information of a user who is using the Transmission Control Protocol (TCP) service; The adjusting unit 1002 is configured to adjust the TCP congestion control parameter according to the policy factor information acquired by the obtaining unit 1001 when the preset transmission control condition is met;

The control unit 1003 is configured to control the data transmission rate of the user by using the TCP congestion control parameter adjusted by the adjustment unit 1002.

The process of adjusting the TCP congestion control parameter in the adjustment unit 1002 in this embodiment is similar to that described in the foregoing step 202 in the embodiment shown in FIG. 2, and details are not described herein again.

The data transmission control device in this embodiment may be an RNC, a base station, or other access network elements. The following takes the RNC and the base station as an example:

When the data transmission control device is an RNC, the data transmission control device can refer to FIG. 11 specifically, including:

The acquiring unit 1101 is configured to acquire policy factor information, where the policy factor information includes at least one of cell congestion information and user information of a user who is using the Transmission Control Protocol (TCP) service; and the adjusting unit 1102 is configured to: when the preset transmission control is met When the condition is met, the TCP congestion control parameter is adjusted according to the policy factor information acquired by the obtaining unit 1101;

The control unit 1103 is configured to control the data transmission rate of the user by using the TCP congestion control parameter adjusted by the adjustment unit 1102.

In this embodiment, the obtaining unit 1101 may further include:

The first obtaining module 11011 is configured to acquire user subscription information of the user from the core network.

The second obtaining module 11012 is configured to acquire real-time user information of the user from the base station;

The fourth obtaining module 11013 is configured to receive a capacity allocation control message sent by the base station, and obtain cell congestion information from the capacity allocation control message.

In this embodiment, the first obtaining module 11011 acquires the user subscription information of the user from the core network, the second obtaining module 11012 acquires the user real-time information of the user from the base station, and the fourth obtaining module 11013 receives the capacity allocation sent by the base station. The process of obtaining the cell congestion information from the capacity allocation control message is the same as the process of obtaining the policy factor information by the RNC in the foregoing step 201 of the embodiment shown in FIG. 2, and details are not described herein again.

The adjusting unit 1102 in this embodiment may be further used to:

Reducing the user's cwnd; the degree of reduction is inversely proportional to at least one of the user's priority, the user's account opening rate, the user's real-time available bandwidth, and the user's received signal code power, and/or, The real-time distance between the user and the base station is proportional to at least one of the user's real-time cache occupancy information;

Or,

Increasing the user's cwnd; the degree of improvement is proportional to at least one of the user's priority, the user's account opening rate, the user's real-time available bandwidth, and the user's received signal code power, and/or, in real time with the user and the base station The distance is inversely proportional to at least one of the user's real-time cache occupancy information;

Or,

Reducing the user's cwnd and ssthresh; the degree of reduction is inversely proportional to at least one of the user's priority, the user's account opening rate, the user's real-time available bandwidth, and the user's received signal code power, and/or between the user and the base station The real-time distance, the degree of congestion indicated by the cell congestion information, and at least one of the user's real-time cache occupancy information are proportional.

The process of adjusting the TCP congestion control parameter in the adjustment unit 1102 in this embodiment is similar to the content described in the foregoing step 202 in the embodiment shown in FIG. 2, and details are not described herein again.

When the data transmission control device is a base station, the data transmission control device can refer to FIG. 12 specifically, including:

The obtaining unit 1201 is configured to acquire policy factor information, where the policy factor information includes at least one of cell congestion information and user information of a user who is using the Transmission Control Protocol (TCP) service; and the adjusting unit 1202 is configured to: when the preset transmission control is met When the condition is met, the TCP congestion control parameter is adjusted according to the policy factor information acquired by the obtaining unit 801;

The control unit 1203 is configured to control the data transmission rate of the user by using the TCP congestion control parameter adjusted by the adjusting unit 1202.

In this embodiment, the first obtaining unit 1201 may further include:

The first obtaining module 12011 is configured to acquire user subscription information of the user from the core network.

The third obtaining module 12012 is configured to perform real-time measurement on the user to obtain a user real-time information of the user. The fifth obtaining module 12013 is configured to measure the cell where the user is located to obtain a cell congestion letter. In the embodiment, the first acquiring module 12011 is from the core. The network obtains the user's subscription information of the user The process of the third obtaining module 12012 for real-time measurement of the user to obtain the user real-time information of the user, and the process for the fifth obtaining module 12013 to measure the cell congestion information of the cell where the user is located, and the foregoing step 1201 of the embodiment shown in FIG. 2 The process of obtaining the policy factor information by the base station is the same, and is not described here.

The adjusting unit 1202 in this embodiment may be further used to:

Reducing the user's cwnd; the degree of reduction is inversely proportional to at least one of the user's priority, the user's account opening rate, the user's real-time available bandwidth, and the user's received signal code power, and/or, and the real time between the user and the base station The distance is proportional to at least one of the user's real-time cache occupancy information;

Or,

The process of adjusting the TCP congestion control parameter in the adjustment unit 1202 in this embodiment is similar to that described in the foregoing step 202 in the embodiment shown in FIG. 2, and details are not described herein again.

In this embodiment, the RNC or the base station may acquire policy factor information including at least one of cell congestion information and user information of a user who is using the transmission control protocol TCP service. After obtaining the policy factor information, the RC or the base station may The policy factor information adjusts the TCP congestion control parameter, and uses the adjusted TCP congestion control parameter to control the data transmission rate of the user, so that the data transmission rate of the user can be controlled according to the actual situation of the wireless network, and not only A conservative control strategy is used. Therefore, the data transmission control method in the embodiment of the present invention can dynamically adjust the control strategy according to different wireless networks, thereby effectively improving the utilization of radio resources. Referring to FIG. 13, another embodiment of the data transmission control device of the present invention includes:

The acquiring unit 1301 is configured to acquire policy factor information, where the policy factor information includes at least one of cell congestion information and user information of a user who is using the Transmission Control Protocol (TCP) service;

The setting unit 1302 is configured to set a TCP congestion control parameter according to the policy factor information acquired by the obtaining unit 1301.

The control unit 1303 is configured to control the data transmission rate of the user by using the TCP congestion control parameter set by the setting unit 1302 when the user initiates the initial TCP acceleration.

The obtaining unit 1301 in this embodiment may further include at least one of the following modules: a first acquiring module, configured to acquire user subscription information of the user from the core network, where the user subscription information includes at least one of a user priority and a user opening rate. ;

a second acquiring module, configured to acquire real-time user information of the user from the base station, where the real-time information of the user includes at least one of a user real-time bandwidth, a received signal code power, a real-time distance between the user and the base station, and a real-time cache occupancy information of the user;

The third obtaining module is configured to perform real-time measurement on the user to obtain real-time information of the user, and the real-time information of the user includes at least one of real-time user bandwidth, received signal code power, real-time distance between the user and the base station, and real-time cache occupancy information of the user. ;

a fourth acquiring module, configured to receive a capacity allocation control message sent by the base station, and obtain cell congestion information from the capacity allocation control message;

The fifth obtaining module is configured to measure cell congestion information of the cell where the user is located. The functions performed by the obtaining unit 1301 in the present embodiment and the connections between the modules in the obtaining unit 1301 are similar to those described in the foregoing embodiments shown in FIG. 11 and FIG. 12, and are not described herein again.

The setting unit 1302 in this embodiment may be further used to:

Setting an initial value of the user's cwnd at the initial acceleration of the TCP according to the policy factor information, and setting the initial value of the cwnd is proportional to at least one of the user's priority, the user's account opening rate, the user's real-time available bandwidth, and the user's received signal code power. And/or, inversely proportional to at least one of a real-time distance between the user and the base station, a degree of congestion indicated by the cell congestion information, and user real-time cache occupancy information.

The setting unit 1302 in this embodiment sets the TCP congestion control parameter and the foregoing FIG. 7 The content described in step 702 in the illustrated embodiment is similar, and details are not described herein again.

The data transmission control device in this embodiment may be an RNC, a base station, or another access network element in the actual application, which is not limited herein.

The foregoing embodiment describes the data transmission control device of the present invention. The data transmission control device in the foregoing embodiment may be applied to various types of networks, such as: a second generation communication network, or a third generation communication network, or an LTE network. The execution flow in different networks is similar.

It should be noted that, since the architectures of the various networks may be different, when the data transmission control method of this embodiment is applied to different types of networks, the types of data transmission control devices may be different, for example, in a GSM network. In the WCDMA network, the data transmission control device of this embodiment may be an RNC or a base station (NodeB).

In the LTE network, the function of the RNC has been transferred to the evolved base station (eNodeB) for the purpose of the flattening of the network. Therefore, in the LTE network, the data transmission control device of this embodiment may be an evolved base station (eNodeB). ).

In this embodiment, the RNC or the base station may acquire policy factor information including at least one of cell congestion information and user information of a user who is using the transmission control protocol TCP service. After obtaining the policy factor information, the RC or the base station may The policy factor information sets a TCP congestion control parameter, and uses the set TCP congestion control parameter to control the data transmission rate of the user, so that the data transmission rate of the user can be controlled according to the actual situation of the wireless network, and not only used. A conservative control strategy, therefore, the data transmission control method in the embodiment of the present invention can dynamically adjust the control strategy according to different wireless networks, thereby effectively improving the utilization of wireless resources.

The data transmission control device provided by the embodiment of the present invention may be used to implement the data transmission control method provided by the foregoing method embodiments. For the specific implementation process, reference may be made to the foregoing method embodiments, and details are not described herein.

A person skilled in the art may understand that all or part of the steps of implementing the above embodiments may be completed by a program to instruct related hardware, and the program may be stored in a computer readable storage medium, and the above mentioned storage medium may be It is a read-only memory, a disk or a disc.

The data transmission control method and device provided by the present invention are described in detail above. For those skilled in the art, according to the idea of the embodiment of the present invention, there are changes in the specific implementation manner and application scope. The contents of this specification are not to be construed as limiting the invention.

Claims

Rights request

A data transmission control method, comprising:

Obtaining policy factor information, the policy factor information including at least one of cell congestion information and user information of a user who is using the transport control protocol TCP service;

If the preset transmission control condition is met, the TCP congestion control parameter is adjusted according to the policy factor information;

The user's data transmission rate is controlled using the adjusted TCP congestion control parameters.

2. The method of claim 1, wherein the user information comprises user subscription information and/or user real-time information.

3. The method of claim 2, wherein

The user subscription information includes at least one of a user priority and a user account opening rate; the user real-time information includes a user real-time bandwidth, a received signal code power, a real-time distance between the user and the base station, and at least a real-time cache occupancy information of the user. One.

4. A method according to any one of claims 1 to 3, characterized in that

The TCP congestion control parameter includes at least one of congestion window information cwnd, congestion counter information snd_cwnd_cnt, and congestion threshold information ssthresh.

The method according to claim 4, wherein adjusting the TCP congestion control parameters according to the policy factor information comprises:

Lowering the cwnd of the user;

The degree of reduction is inversely proportional to at least one of a priority of the user, an account opening rate of the user, a real-time available bandwidth of the user, and a received signal code power of the user, and/or The real-time distance between the user and the base station is proportional to at least one of the user's real-time cache occupancy information.

6. The method of claim 5, wherein

When it is determined that TCP congestion is to occur, it is determined that the preset transmission control condition is satisfied.

7. The method of claim 6 wherein:

If the cell congestion information or the user real-time cache occupancy information indicates that the cell is congested, it is determined that TCP congestion is to occur.

The method according to claim 6, wherein the reducing the cwnd of the user comprises:

Adjusting the user's cwnd so that:

The cwnd _new is the adjusted cwnd of the user, the cwnd. _Ld is the cwnd before the adjustment of the user, R represents the degree of the reduction, and R is a real number greater than 0 and less than 100.

9. The method of claim 8 wherein:

If the cwnd _{new is} greater than or equal to the ssthresh, the snd_cwnd_cnt of the user is adjusted to compensate the cwnd _new .

10. The method of claim 9, wherein the adjusting the user's snd_cwnd-cnt to compensate the user cwnd _new comprises:

Adjusting the user's snd_cwnd-cnt so that:

Snd— cwnd— cnt _new = snd— cwnd— cnt _old — cwnd _new * ( ( cwnd _new * R ) mod 100 ) div 100;

The snd_cwnd_cnt _new is the adjusted snd_cwnd_cnt of the user, the snd-cwnd-cnt. _Ld is the pre-adjusted snd_cwnd-cnt of the user.

11. The method of claim 5, wherein

If the user has TCP timeout congestion, it is determined that the preset transmission control condition is satisfied.

The method according to claim 11, wherein the reducing the cwnd of the user comprises:

Adjusting the user's cwnd so that:

The cwnd _new is the adjusted cwnd of the user, the cwnd. _Ld is the pre-adjusted cwnd of the user, and the K is a real number greater than 0 and less than 100.

Raising the cwnd of the user;

The degree of improvement is proportional to at least one of a priority of the user, an account opening rate of the user, a real-time available bandwidth of the user, and a received signal code power of the user, and/or, It is inversely proportional to at least one of a real-time distance between the user and the base station and the user's real-time cache occupancy information.

14. The method of claim 13 wherein:

When it is determined that TCP congestion has not occurred, it is determined that the preset transmission control condition is satisfied.

15. The method of claim 14 wherein:

If the cell congestion information or the user real-time cache occupancy information indicates that the cell is not congested, it is determined that TCP congestion does not occur.

16. The method of claim 14, wherein said increasing cwnd of said user comprises:

Adjusting the user's cwnd so that:

Cwnd _new = ( 1+ R% ) * cwnd _old ;

The cwnd _new is the adjusted cwnd of the user, the cwnd. _Ld is the pre-adjusted cwnd of the user, and R is a real number greater than zero.

17. The method of claim 16 wherein:

The method according to claim 17, wherein the adjusting the snd_cwnd_cnt of the user to compensate the user cwnd _new includes:

Adjusting the user's snd_cwnd-cnt so that:

Snd—cwnd— cnt _new = snd— cwnd— cnt _old + cwnd _new * ( ( cwnd _new * R ) mod 100 ) div 100;

The snd_cwnd_cnt _new is the adjusted snd_cwnd_cnt of the user, and the snd_cwnd_cnt. i _d is the pre-adjusted snd_cwnd-cnt of the user.

Lowering the user's cwnd and ssthresh;

The degree of reduction is inversely proportional to at least one of a priority of the user, an account opening rate of the user, a real-time available bandwidth of the user, and a received signal code power of the user, and/or Real-time distance between the user and the base station, and the degree of congestion indicated by the cell congestion information is And proportional to at least one of the user real-time cache occupancy information.

20. The method of claim 19, wherein

If the user has TCP retransmission congestion, it is determined that the preset transmission control condition is satisfied.

21. The method of claim 20, wherein said reducing cwnd and ssthresh of said user comprises:

Adjust the user's cwnd and ssthresh so that:

Cwndnew = ( 1- X% ) * cwnd _old ;

Ssthresh = ( 1 - Y% ) * ssthresh _o]d ;

The cwnd _new is the adjusted cwnd of the user, the cwnd. _Ld is the pre-adjusted cwnd of the user, the ssthresh _new is the adjusted ssthresh of the user, the ssthresh _ld is the pre-adjusted ssthresh of the user, and the XY is greater than or equal to 0, and A real number less than 100.

22. A data transmission control method, comprising:

Setting a TCP congestion control parameter according to the policy factor information;

If the user initiates TCP initial acceleration, the data transmission rate of the user is controlled using the set TCP congestion control parameter.

The method according to claim 22, wherein the user information comprises user subscription information and/or user real-time information.

24. The method of claim 23, wherein

The method according to any one of claims 22 to 24, wherein the setting the TCP congestion control parameter according to the policy factor information comprises:

Setting an initial value of the user's cwnd when the initial acceleration of the TCP is set according to the policy factor information, the initial value of the set cwnd and the priority of the user, the account opening rate of the user, the real-time available bandwidth of the user, and the Deriving at least one of the user's received signal code power, and / Or, inversely proportional to at least one of a real-time distance between the user and the base station, a degree of congestion indicated by the cell congestion information, and the real-time cache occupancy information of the user.

The method according to claim 25, wherein the initial value of the user's cwnd when the initial TCP acceleration is set according to the policy factor information includes:

Setting the initial value of the user's cwnd so that:

Cwnd initial value = max - cwnd * M%;

The max_cwnd is the maximum congestion window information, and the max_cwnd is calculated by the maximum receiving window information max_rwnd of the receiving end, the user bandwidth, and the TCP round trip time;

The M is a real number greater than 0 and less than or equal to 100, the set initial value of cwnd and the priority of the user, the account opening rate of the user, the real-time available bandwidth of the user, and the receiving by the user. At least one of signal code power is proportional to, and/or inversely proportional to at least one of a real-time distance between the user and the base station, a degree of congestion indicated by the cell congestion information, and the user's real-time cache occupancy information. .

27. A data transmission control device, comprising:

And an acquiring unit, configured to acquire policy factor information, where the policy factor information includes at least one of cell congestion information and user information of a user who is using the Transmission Control Protocol (TCP) service;

And an adjusting unit, configured to adjust a TCP congestion control parameter according to the policy factor information acquired by the acquiring unit when the preset transmission control condition is met;

And a control unit, configured to control, by using the adjusted TCP congestion control parameter by the adjusting unit, a data transmission rate of the user.

28. The device according to claim 27, wherein the obtaining unit comprises at least one of the following modules:

a first obtaining module, configured to acquire user subscription information of the user from a core network, where the user subscription information includes at least one of a user priority and a user account opening rate;

a second acquiring module, configured to acquire real-time user information of the user from a base station, where the real-time information of the user includes a user real-time bandwidth, a received signal code power, a real-time distance between the user and the base station, and at least a real-time cache occupancy information of the user. One;

a third acquiring module, configured to perform real-time measurement on the user to obtain real-time information of the user of the user, where the real-time information of the user includes real-time user bandwidth, received signal code power, user and base station At least one of a real-time distance between the user and a real-time cache occupancy information of the user;

a fifth acquiring module, configured to perform measurement on the cell where the user is located, to obtain congestion of the cell

^ 吕息.

The apparatus according to claim 27 or 28, wherein the adjusting unit is further used for:

Reducing the cwnd of the user; the degree of the reduction is inversely proportional to at least one of a priority of the user, an account opening rate of the user, a real-time available bandwidth of the user, and a received signal code power of the user, And/or proportional to at least one of a real-time distance between the user and the base station and the user real-time cache occupancy information;

Or,

Increasing a cwnd of the user; the degree of improvement is proportional to at least one of a priority of the user, an account opening rate of the user, a real-time available bandwidth of the user, and a received signal code power of the user, And/or inversely proportional to at least one of a real-time distance between the user and the base station and the user real-time cache occupancy information;

Or,

Reducing cwnd and ssthresh of the user; the degree of the reduction is at least one of a priority of the user, an account opening rate of the user, a real-time available bandwidth of the user, and a received signal code power of the user. In inverse ratio, and/or, proportional to at least one of a real-time distance between the user and the base station, a degree of congestion indicated by the cell congestion information, and the user real-time cache occupancy information.

30. A data transmission control device, comprising:

a setting unit, configured to set a TCP congestion control parameter according to the policy factor information acquired by the acquiring unit;

And a control unit, configured to control, when the user initiates the initial acceleration of the TCP, the data transmission rate of the user by using a TCP congestion control parameter set by the setting unit.

The device according to claim 30, wherein the obtaining unit comprises at least one of the following modules:

a third acquiring module, configured to perform real-time measurement on the user to obtain real-time information of the user of the user, where the real-time information of the user includes real-time user bandwidth, received signal code power, real-time distance between the user and the base station, and real-time cache of the user. At least one of the occupied information;

The fifth obtaining module is configured to perform measurement on the cell where the user is located to obtain the cell congestion information.

The device according to claim 30 or 31, wherein the adjusting unit is further used for:

Setting an initial value of the user's cwnd when the initial acceleration of the TCP is set according to the policy factor information, the initial value of the set cwnd and the priority of the user, the account opening rate of the user, the real-time available bandwidth of the user, and the Deriving at least one of the user's received signal code power, and/or, with the real-time distance between the user and the base station, the degree of congestion indicated by the cell congestion information, and the real-time cache occupancy information of the user At least one is inversely proportional.