CN107360101A - A kind of TCP congestion avoidance algorithms based on auto-adaptive parameter - Google Patents
A kind of TCP congestion avoidance algorithms based on auto-adaptive parameter Download PDFInfo
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- CN107360101A CN107360101A CN201710660611.2A CN201710660611A CN107360101A CN 107360101 A CN107360101 A CN 107360101A CN 201710660611 A CN201710660611 A CN 201710660611A CN 107360101 A CN107360101 A CN 107360101A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L47/00—Traffic control in data switching networks
- H04L47/10—Flow control; Congestion control
- H04L47/27—Evaluation or update of window size, e.g. using information derived from acknowledged [ACK] packets
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L47/00—Traffic control in data switching networks
- H04L47/10—Flow control; Congestion control
- H04L47/29—Flow control; Congestion control using a combination of thresholds
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L69/00—Network arrangements, protocols or services independent of the application payload and not provided for in the other groups of this subclass
- H04L69/16—Implementation or adaptation of Internet protocol [IP], of transmission control protocol [TCP] or of user datagram protocol [UDP]
- H04L69/163—In-band adaptation of TCP data exchange; In-band control procedures
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Abstract
The invention discloses a kind of TCP congestion avoidance algorithms based on auto-adaptive parameter, comprise the following steps：During network data transmission, with the quantity increase of congestion window, network enters congestion avoidance phase by the slow incipient stage；If Retransmission timeout occurs in congestion avoidance phase, judge that network there occurs congestion, starts to perform the TCP congestion avoidance algorithms based on auto-adaptive parameter, congestion window and the slow size for starting threshold value are dynamically controlled by setting auto-adaptive parameter；By detecting congestion window whether in threshold interval, judge whether network recovers from congestion, if do not recovered, continue executing with congestion avoidance algorithm, until network recovers from congestion.The mode for the auto-adaptive parameter that the present invention takes, allow the network to combine current actual conditions, be adaptively adjusted congestion window value and slow beginning threshold value so that network can quickly break away from congestion, the utilization rate of network is improved simultaneously, avoids network from acutely shaking.
Description
Technical field
The present invention relates to computer network transmission control protocol technical field, more particularly to it is a kind of based on auto-adaptive parameter
TCP congestion avoidance algorithms.
Background technology
According to statistics, if retransmission events are occurred in Web server, wherein Retransmission timeout has accounted for 70%, common
In video tour website, Retransmission timeout has also accounted for half or so.In specific data transmission procedure, network congestion can be serious
The performance of data transfer is influenceed, the processing strategy for Retransmission timeout has been largely fixed the transmission performance of network.
In the prior art, there is multiple technologies scheme to carry out the congestion control of network, such as Application No.：
A kind of TCP jamming control methods based on handling capacity rate of change ECN mechanism disclosed in CN201310002460.3, due to this side
Method primary operational is in router side, it is necessary to which progress ECN mark, so needs are modified in exchange generator terminal on switches
And operation, it is more complicated in specific implement, it is difficult to control.For another example Application No.：CN03155730.9 patent is according to really
Bag ACK relative one-way delay variation tendency is recognized to judge the congestion condition of link, and then it is because link congestion to distinguish packet loss
It is caused or because wireless error causes, different Restoration Mechanisms is adaptively taken according to different packet loss reasons；But
This mode needs to calculate relative one-way delay and estimates the variation tendency of relative one-way delay, in specific implementation process,
Because the RTT of network transmission is that Millisecond is other, the precision of calculating is difficult to control, and easily causes erroneous judgement, may influence reality
Border effect.
The content of the invention
Adjustment of the technical problem to be solved in the present invention in the relevant parameter in for Retransmission timeout algorithm in the prior art
Strategy is relatively fixed, and can not combine the problem of current actual conditions of network carry out congestion control, also, in a practical situation,
When network congestion phenomenon occurs, time-out or situation about losing occur for the data of not usually one transmitting terminal, may
To occur in multiple transmitting terminals, at this moment according to existing congestion control policy the value of these transmission windows can be reduced to one compared with
Low level, and start to perform slowstart algorithm；The congestion window of these transmitting terminals increases to net from current reduced levels
The disposal ability of network needs the regular hour, and within this long time, Internet resources are not efficiently used, and are caused
Waste.Based on it is above-mentioned the problem of, there is provided a kind of TCP congestion avoidance algorithms based on auto-adaptive parameter.
The technical solution adopted for the present invention to solve the technical problems is：
The present invention provides a kind of TCP congestion avoidance algorithms based on auto-adaptive parameter, comprises the following steps：
During network data transmission, with the quantity increase of congestion window, network is kept away by the slow incipient stage into congestion
Exempt from the stage；
If Retransmission timeout occurs in congestion avoidance phase, judge that network there occurs congestion, starts to perform based on certainly
The TCP congestion avoidance algorithms of adaptation parameter, congestion window and slow beginning thresholding are dynamically controlled by setting auto-adaptive parameter
The size of value；
By detecting congestion window whether in threshold interval, judge whether network recovers from congestion, if
Do not recover, then continue executing with the TCP congestion avoidance algorithms based on auto-adaptive parameter, until network recovers from congestion.
Further, the method for setting auto-adaptive parameter is in algorithm of the invention：
Auto-adaptive parameter μ=2 are set-x；Wherein, when Retransmission timeout occurs, the value of congestion window is opened slowly more than current
The value of beginning threshold value, it is the value of congestion window to introduce variable x=ssthresh/cwnd, cwnd, and ssthresh starts thresholding to be slow
The value of value.
Further, it is of the invention dynamically to control congestion window and slow beginning threshold value by setting auto-adaptive parameter
The method of size be：
If variable x=ssthresh/cwnd is less than or equal to 0.5, illustrate that congestion window is much larger than the slow beginning of Congestion Avoidance
Threshold value, i.e., now there is longer time that congestion does not occur in network environment；
Then it is multiplied by auto-adaptive parameter μ to congestion window cwnd to be adjusted, by making full use of the bandwidth of network and avoiding
The shake of network, makes network recover from congestion.
Further, it is of the invention dynamically to control congestion window and slow beginning threshold value by setting auto-adaptive parameter
The method of size be：
If variable x=ssthresh/cwnd is more than the threshold value of setting, illustrate congestion window and the slow number for starting threshold value
It is worth close, i.e., now congestion was occurring not long ago for network；
The slow threshold value that starts is arranged to：New_ssthresh=μ × cwnd；
Congestion window is arranged to：New_cwnd=μ × cwnd/2.
The beneficial effect comprise that：The TCP congestion avoidance algorithms based on auto-adaptive parameter of the present invention, by certainly
Adaptation parameter dynamically adjusts congestion window and slow beginning threshold value, network is broken away from congestion, the algorithm is only to sender's
Transmission Control Protocol carries out a small amount of modification, the Transmission Control Protocol without changing intermediate node, and changes and relate only to transport layer, and other
Layer protocol is unrelated；The adjustable strategies for solving relevant parameter in existing Retransmission timeout algorithm are relatively fixed, and can not combine network
Current actual conditions carry out the problem of congestion control；The algorithm allows the network to combine current actual conditions, adaptively
Ground adjusts congestion window value and slow beginning threshold value so that network can quickly break away from congestion, while improve the utilization of network
Rate, network is avoided acutely to shake.
Brief description of the drawings
Below in conjunction with drawings and Examples, the invention will be further described, in accompanying drawing：
Fig. 1 is the algorithm flow chart of the embodiment of the present invention；
Fig. 2 is the TCP jamming control method flow charts based on auto-adaptive parameter of the embodiment of the present invention；
Fig. 3 be the embodiment of the present invention improvement before and after Retransmission timeout congestion window variation diagram.
Embodiment
In order to make the purpose , technical scheme and advantage of the present invention be clearer, it is right below in conjunction with drawings and Examples
The present invention is further elaborated.It should be appreciated that specific embodiment described herein is only to explain the present invention, not
For limiting the present invention.
As shown in figure 1, the TCP congestion avoidance algorithms based on auto-adaptive parameter of the embodiment of the present invention, comprise the following steps：
During network data transmission, with the quantity increase of congestion window, network is kept away by the slow incipient stage into congestion
Exempt from the stage；
If Retransmission timeout occurs in congestion avoidance phase, judge that network there occurs congestion, starts to perform based on certainly
The TCP congestion avoidance algorithms of adaptation parameter, congestion window and slow beginning thresholding are dynamically controlled by setting auto-adaptive parameter
The size of value；
By whether detecting congestion window in (the general value of threshold value is ssthresh=16) in threshold interval, net is judged
Whether network recovers from congestion, if do not recovered, continues executing with the TCP congestion controls based on auto-adaptive parameter and calculates
Method, until network recovers from congestion.
The method of setting auto-adaptive parameter is in the algorithm：
Auto-adaptive parameter μ=2 are set-x；Wherein, when Retransmission timeout occurs, the value of congestion window is opened slowly more than current
The value of beginning threshold value, it is the value of congestion window to introduce variable x=ssthresh/cwnd, cwnd, and ssthresh starts thresholding to be slow
The value of value.
The method of congestion window and the slow size for starting threshold value is dynamically controlled to be by setting auto-adaptive parameter：
If variable x=ssthresh/cwnd is less than or equal to 0.5, illustrate that congestion window is much larger than the slow beginning of Congestion Avoidance
Threshold value, i.e., now there is longer time that congestion does not occur in network environment；
Then it is multiplied by auto-adaptive parameter μ to congestion window cwnd to be adjusted, by making full use of the bandwidth of network and avoiding
The shake of network, makes network recover from congestion.
If variable x=ssthresh/cwnd is more than the threshold value of setting, illustrate congestion window and the slow number for starting threshold value
It is worth close, i.e., now congestion was occurring not long ago for network；
The slow threshold value that starts is arranged to：New_ssthresh=μ × cwnd；
Congestion window is arranged to：New_cwnd=μ × cwnd/2.
As shown in Fig. 2 in another specific embodiment of the present invention：
It is relatively fixed, can not works as with reference to network to solve the adjustable strategies of relevant parameter in existing Retransmission timeout algorithm
Preceding actual conditions carry out the problem of congestion control.In a practical situation, when network congestion phenomenon occurs, it is not usually
Time-out or situation about losing occur for the data of one transmitting terminal, it may be possible to occur in multiple transmitting terminals, at this moment according to existing
The value of these transmission windows can be reduced to a relatively low level by congestion control policy, and start to perform slowstart algorithm.
The disposal ability that the congestion window of these transmitting terminals increases to network from current reduced levels needs the regular hour, at this
Within the long time, Internet resources are not efficiently used, and cause to waste.Based on it is above-mentioned the problem of, there is provided one kind is based on
The TCP jamming control methods of auto-adaptive parameter.
In data transmission procedure, network performs since the slow incipient stage, and in this stage, the congestion window in network is
Start according to exponential form increased.When the value of congestion window exceedes full gate beginning threshold value, network starts to perform Congestion Avoidance
Algorithm, the rate of rise of congestion window slow down.In congestion avoidance phase, network is due to resource-constrained, it may occur that Retransmission timeout is existing
As, this is to judge network there occurs congestion, start to perform set forth herein the calculation of the TCP congestion controls based on auto-adaptive parameter
Method.
The algorithm of proposition is mainly when Retransmission timeout occurs, and passes through auto-adaptive parameter μ=2 of introducing-xTo realize pair
The adjustment of congestion window.Wherein x=ssthresh/cwnd, it is known that the change of μ values is the threshold value by slowly
Ssthresh and congestion window value cwnd dynamics determine.In TCP congestion control procedure, the slow threshold value that starts represents net
The ability of network processing data, congestion window value represent the ability that transmitting terminal can send data, and the two parameters together decide on
Network performance.Thus, the abilities of data is sent by starting threshold value and congestion window value slowly come common adjustment network, this
Kind strategy really has adaptivity.TCP jamming control methods based on auto-adaptive parameter are mainly sent out in Retransmission timeout
When raw, congestion window and slow beginning threshold value are changed according to being multiplied by related parameter μ respectively.If by one as above
Secondary change can't cause network to recover from congestion, and network will detect congestion again, perform this paper plan again
Slightly, so repeat, until network recovers from congestion.
First, according to set forth herein strategy, introduce corresponding auto-adaptive parameter μ, TCP Congestion control protocols repaiied
Change, mainly when Retransmission timeout occurs for network, for the slow adjustment plan for starting threshold value ssthresh and congestion window cwnd
Slightly it is changed according to corresponding μ values, and compiles and pass through.
Secondly, network proceeds by data transfer, and at this moment network can enter the slow incipient stage；At this stage, network
Congestion window value be less than it is slow start threshold value, congestion window just increases according to exponential form.When the value of congestion window increases
During to more than slow beginning threshold value, data transfer has reached the disposal ability of network, and congestion window starts to increase according to linear forms
Long, now network enters congestion avoidance phase.
Then, when the data volume increase handled in network, because the disposal ability of network is limited, it will packet loss occurs and shows
As at this moment needing just to retransmit the packet of discarding.Retransmission timeout strategy be exactly according to set forth herein based on adaptive ginseng
Several TCP jamming control methods.
Dynamically control congestion window cwnd's and slow beginning threshold value ssthresh using the auto-adaptive parameter μ of introducing
Size, on the one hand makes cwnd be at preferable section, on the other hand enables the network to as far as possible small cost from congestion
Recover.If current cwnd change can not be such that network recovers from congestion, it will be received again by and gather around in network
The signal of plug, now, network will perform the TCP congestion avoidance algorithms of auto-adaptive parameter again to current cwnd so that
Network is broken away from from congestion, and the brief false code of TCP congestion avoidance algorithms of auto-adaptive parameter is as follows.
When Retransmission timeout occurs, cwnd value of the value always greater than current ssthresh, i.e. cwnd ＞ ssthre,
Sh introduces variable x=ssthresh/cwnd.X is analyzed it is known that when x is smaller, illustrate now congestion window cwnd
Much larger than the threshold value ssthresh of Congestion Avoidance, i.e., there is longer time that congestion, net does not occur in network environment now
Network environment is better.If the phenomenon of Retransmission timeout at this moment occurs, it may be considered that net is seen to the cwnd adjustment carried out by a small margin
Whether network can recover from congestion, if can if illustrate that it can make full use of and network bandwidth and avoid trembling for network
It is dynamic.When x is larger, the value for illustrating cwnd and ssthresh relatively, can learn network very recently just there occurs
Congestion, now need just network can be made to break away from from congestion the change that cwnd is carried out by a relatively large margin.In view of being gathered around in TCP
The slow start stage in control process is filled in, congestion window cwnd is with index by AIMD (and formula increase, product formula are reduced) algorithm
Form increases, and introduces formula μ=2-x, you can realize the adjustment to congestion window.
Concrete analysis proves as follows：
Existing condition x=ssthresh/cwnd, it is known that 0 ＜ x ＜ 1, now there is μ=2-x, carrying out derivation to μ can
To obtain.
μ '=- 2-xThe ＜ x ＜ 1 of ln2 0
μ "=(2-xln2)20 ＜ x ＜ 1
By μ ' ＜ 0, μ " ＞ 0 it is known that μ is subtraction function on section (0,1), and smoother, it can cause just
Network smoothly recovers from congestion.
By above-mentioned false code, set forth herein the main operation of innovatory algorithm be after time-out occurs, by door
Limit value ssthresh is arranged to μ × cwnd, and the value of congestion window is set as μ × cwnd/2.By this dynamic adjustable strategies, allow
Algorithm adaptively can recover with reference to the actual conditions of current network from congestion, Retransmission timeout algorithm congestion before and after improvement
Window change is as shown in Figure 3.
It should be appreciated that for those of ordinary skills, can according to the above description be improved or converted,
And all these modifications and variations should all belong to the protection domain of appended claims of the present invention.
Claims (4)
1. a kind of TCP congestion avoidance algorithms based on auto-adaptive parameter, it is characterised in that comprise the following steps：
During network data transmission, with the quantity increase of congestion window, network enters Congestion Avoidance rank by the slow incipient stage
Section；
If Retransmission timeout occurs in congestion avoidance phase, judge that network there occurs congestion, starts to perform based on adaptive
The TCP congestion avoidance algorithms of parameter, dynamically control congestion window by setting auto-adaptive parameter and start threshold value slowly
Size；
By detecting congestion window whether in threshold value, judge whether network recovers from congestion, if do not recovered,
The TCP congestion avoidance algorithms based on auto-adaptive parameter are then continued executing with, until network recovers from congestion.
2. the TCP congestion avoidance algorithms according to claim 1 based on auto-adaptive parameter, it is characterised in that in the algorithm
Set auto-adaptive parameter method be：
Auto-adaptive parameter μ=2 are set-x；Wherein, when Retransmission timeout occurs, the value of congestion window is more than current slow beginning door
The value of limit value, it is the value of congestion window to introduce variable x=ssthresh/cwnd, cwnd, and ssthresh is slow beginning threshold value
Value.
3. the TCP congestion avoidance algorithms according to claim 2 based on auto-adaptive parameter, it is characterised in that pass through setting
Auto-adaptive parameter is dynamically to control the method for congestion window and the slow size for starting threshold value：
If variable x=ssthresh/cwnd is less than or equal to 0.5, illustrate that congestion window is much larger than the slow beginning thresholding of Congestion Avoidance
Value, i.e., now have longer time that congestion does not occur in network environment；
Then it is multiplied by auto-adaptive parameter μ to congestion window cwnd to be adjusted, by making full use of the bandwidth of network and avoiding network
Shake, network is recovered from congestion.
4. the TCP congestion avoidance algorithms according to claim 2 based on auto-adaptive parameter, it is characterised in that pass through setting
Auto-adaptive parameter is dynamically to control the method for congestion window and the slow size for starting threshold value：
If variable x=ssthresh/cwnd is more than the threshold value of setting, illustrate congestion window and the slow numerical value phase for starting threshold value
Closely, i.e., now congestion was occurring not long ago for network；
The slow threshold value that starts is arranged to：New_ssthresh=μ × cwnd；
Congestion window is arranged to：New_cwnd=μ × cwnd/2.
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| CN111200843A (en) * | 2020-01-03 | 2020-05-26 | 浙江工业大学 | Cross-layer congestion control method based on 5G mobile network |
| CN111614572A (en) * | 2020-04-28 | 2020-09-01 | 网络通信与安全紫金山实验室 | TCP network congestion control method based on RTT |
| CN112822116A (en) * | 2020-12-29 | 2021-05-18 | 广东省电信规划设计院有限公司 | TCP congestion control method and device |
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| CN114268588A (en) * | 2021-11-30 | 2022-04-01 | 网络通信与安全紫金山实验室 | Data transmission method and device, electronic equipment and storage medium |
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