CN107979542A - Network congestion determines method and local terminal network element - Google Patents
Network congestion determines method and local terminal network element Download PDFInfo
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- CN107979542A CN107979542A CN201711339608.7A CN201711339608A CN107979542A CN 107979542 A CN107979542 A CN 107979542A CN 201711339608 A CN201711339608 A CN 201711339608A CN 107979542 A CN107979542 A CN 107979542A
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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
- H04L47/12—Avoiding congestion; Recovering from congestion
- H04L47/127—Avoiding congestion; Recovering from congestion by using congestion prediction
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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
- H04L47/28—Flow control; Congestion control in relation to timing considerations
- H04L47/283—Flow control; Congestion control in relation to timing considerations in response to processing delays, e.g. caused by jitter or round trip time [RTT]
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- Engineering & Computer Science (AREA)
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Abstract
This application provides a kind of network congestion to determine method and local terminal network element, including：Data block is sent to opposite end network element, the data block includes data block sending time；The response bag that opposite end network element is sent is received, the response bag includes the data block sending time；In preset time, according to the data block sending time in the system time and the response bag when receiving response bag, multiple network round-trip time delay RTT are determined；When the multiple RTT values are in increasing trend, it is congestion state to determine the network.The application not only greatly make use of network bandwidth, but also break bandwidth occupancy fair principle, be to take advantage during other application competition network bandwidth.
Description
Technical field
This application involves technical field of data transmission, more particularly to a kind of network congestion to determine method and local terminal network element.
Background technology
With the increase of network bandwidth, the growth of distance, the efficiency that large-scale data transmission is carried out using Transmission Control Protocol is more next
It is lower.Transmission Control Protocol controls congestion using AIMD strategies, once occur congestion, send window reduce half immediately, then again by
Cumulative to add transmission window to improve speed, this seriously will cause network acutely to be shaken, bandwidth usage is insufficient.
And carried out data transmission using udp protocol, since udp protocol is insecure, receiving terminal is out of order for packet loss, bag
Etc. no effective recovery ways.
On the basis of udp protocol, UDT (UDP-based Data Transfer Protocol, the data based on UDP
Transport protocol) it can support the online mass data transfers of high speed wide area, its bottom is transmitted using UDP, and number is realized in application layer
Retransmitted according to bag response, packet loss, congestion control；UDT is estimated by the parameter such as buffering that the data volume of reception, RTT, receiving terminal discharge
Current bandwidth is calculated, avoids the generation of congestion；Secondly UDT takes into account the principle of network bandwidth fair employment, once there are congestion collision, meeting
The bandwidth of itself occupancy is reduced rapidly, this is in a disadvantageous position in the bandwidth contention of different application.
The deficiencies in the prior art are：
Bandwidth usage is insufficient during current network data transmission.
The content of the invention
The embodiment of the present application proposes a kind of network congestion and determines method and local terminal network element, to solve data in the prior art
The insufficient technical problem of bandwidth usage in transmitting procedure.
The embodiment of the present application provides a kind of network congestion and determines method, includes the following steps：
Data block is sent to opposite end network element, the data block includes data block sending time；
The response bag that opposite end network element is sent is received, the response bag includes the data block sending time；
In preset time, when the data block in the system time and the response bag when receiving response bag is sent
Between, determine multiple network round-trip time delay RTT；
When the multiple RTT values are in increasing trend, it is congestion state to determine the network.
The embodiment of the present application provides a kind of local terminal network element, including：
Sending module, for sending data block to opposite end network element, the data block includes data block sending time；
Receiving module, the response bag sent for receiving opposite end network element, the response bag include the data block and send
Time；
Computing module, in preset time, according in the system time and the response bag when receiving response bag
Data block sending time, determine multiple network round-trip time delay RTT；
Determining module, for when the multiple RTT values are in increasing trend, it to be congestion state to determine the network.
Have the beneficial effect that：
By the technical solution that the embodiment of the present application is provided, judged by judging the trend of network round-trip time delay RTT
The congestion situation of network, the size of transmission window is adjusted with this so that and sending data volume can fluctuate in slightly above congestion point,
This mode not only greatly make use of network bandwidth, but also break bandwidth occupancy fair principle, be that other application competes
Take advantage during network bandwidth.
Brief description of the drawings
The specific embodiment of the application is described below with reference to accompanying drawings, wherein：
Fig. 1 shows that network congestion determines the flow diagram that method is implemented in the embodiment of the present application；
Fig. 2 shows the structure diagram of local terminal network element in the embodiment of the present application.
Embodiment
In order to which the technical solution of the application and advantage is more clearly understood, below in conjunction with attached drawing to the exemplary of the application
Embodiment is described in more detail, it is clear that and described embodiment is only the part of the embodiment of the application, rather than
The exhaustion of all embodiments.And in the case where there is no conflict, the feature in the embodiment and embodiment in this explanation can be mutual
It is combined.
In view of the deficiencies of the prior art, the embodiment of the present application proposes a kind of network congestion and determines method and local terminal network element,
It is illustrated below.
Embodiment 1,
Fig. 1 shows that network congestion determines the flow diagram that method is implemented in the embodiment of the present application, as shown in the figure, described
Method may include steps of：
Step 101, to opposite end network element send data block, and the data block includes data block sending time；
Step 102, receive the response bag that opposite end network element is sent, and the response bag includes the data block sending time；
Step 103, in preset time, according to the data in the system time and the response bag when receiving response bag
Block sending time, determines multiple network round-trip time delay RTT；
Step 104, when the multiple RTT values are in increasing trend, it is congestion state to determine the network.
Local terminal network element can send data block to opposite end network element, can include the data block in the structure of the data block
Sending time, opposite end network element can send response bag after receiving the data block to local terminal network element, be carried in the response bag
The sending time of the data block, after local terminal network element receives the response bag that opposite end network element is sent, can calculate this data
The network round-trip time delay RTT1 that block is sent；Then it is further continued for sending subsequent data chunk, it is identical with the forwarding step of a upper data block,
Local terminal network element can calculate the network round-trip time delay of this data block transmission after the response bag that opposite end network element is sent is received
RTT2；And so on, through after a period of time, multiple round-trip delays can be obtained；The embodiment of the present application can be according to described more
The size variation trend of the numerical value of a round-trip delay, determine network whether congestion.
By the technical solution that the embodiment of the present application is provided, judged by judging the trend of network round-trip time delay RTT
The congestion situation of network, the size of transmission window is adjusted with this so that and sending data volume can fluctuate in slightly above congestion point,
This mode not only greatly make use of network bandwidth, but also break bandwidth occupancy fair principle, be that other application competes
Take advantage during network bandwidth.
In implementation, before the transmission data block to opposite end network element, the method may further include：
Communicate with opposite end network element, determine the data block size after consulting；
Piecemeal is carried out to source data according to the data block size.
When it is implemented, local terminal network element can first be led to before data block is sent to opposite end network element with opposite end network element
Letter, the size of negotiation data block, after the size of data block is determined, local terminal network element can be by source data to be sent according to institute
Consult definite data block size and carry out piecemeal, then subsequently send the data block after each piecemeal successively.
In implementation, the initial value of the RTT can be and the round-trip delay in the network element communication process of opposite end.
When it is implemented, local terminal network element can record communication process when with opposite end network element communication negotiation data block size
In network round-trip time delay, and the initial value for the round-trip delay that the network round-trip time delay is transmitted as subsequent data blocks.
It is described to send data block to opposite end network element in implementation, it can include：
The data block of default quantity is put into caching, and the state of data block is arranged to " to be sent "；
Each data block obtains present system time as data block sending time before sending, send the data block；
The data-block cache of the transmission is retained, state is arranged to " waiting to be answered "；
After the corresponding response bag of the data block that opposite end network element to be received is sent, which is changed to " response
Success ".
When it is implemented, the structure of each data block may each comprise data block sequence number, sending time, current state, net
The attribute data such as lotus size and payload.
In implementation, the method may further include：
If the data block is not received still more than the default retransmission time out time after the data block sending time
Response bag, obtain present system time as data block sending time, resend the data block to opposite end network element.
When it is implemented, can be by the current time of system compared with the sending time of data block, when working as system
When the difference of the sending time of preceding time and the data block is more than the pre-set retransmission time out time, also it is not received by described
The corresponding response bag of data block, then resend the data block, and present system time is taken when sending the data block as transmission
Time, the data block is sent to opposite end network element.
After a data block is retransmitted, it can continue to be compared the sending time of the current time of system and data block
Compared with when the current time of system and the difference of sending time of the data block are more than the pre-set retransmission time out time, also
The corresponding response bag of the data block is not received by, then sends the data block again.And so on, until receiving correspondence
The response position of data block.
In implementation, the retransmission time out time can be the multiple of the RTT initial values.
When it is implemented, the retransmission time out time can be pre-set fixed value, can be the multiple of RTT initial values,
Such as retransmission time out time RTO=3*RTT0, retransmission time out time RTO=5*RTT0Deng.
In implementation, the RTT is in increasing trend, Ke Yiwei：
(RTT0+RTT0/2)<RTT1<RTT2<…<RTTn；
Wherein, subscript represents the network round-trip time delay of ith data transfer, or the network round-trip of i-th of data block
Time delay.
In implementation, the method may further include：
If the network is in congestion state, the transmission window is reduced into SNDVar；
If network does not have congestion, by the transmission window increase SNDVar；
The SNDVarValue increased according to the congestion state duration, initial value be sent with network maximum capacity it is pre-
If the data block of time, the data volume that opposite end network element receives.
When it is implemented, if network is in congestion state, then can will send window and reduce SNDVar；If network
There is no congestion, then can will send window increase SNDVar.
Wherein, the value of the SNDVar can increase according to the congestion state duration, such as SND0/20、SND0/10、
SND0/ 5 etc.；SND0Can be according to the result real-time update of receiving terminal constant feedback.
Embodiment 2,
The embodiment of the present application can include following process in the specific implementation：
1st, transmitting terminal communicates with receiving terminal, negotiation data block size, obtains and is worth based on current RTT values, is denoted as
RTT0。
2nd, the data block size that source data is consulted by step 1 is subjected to piecemeal, interpolation data block header；
The structure of each data block can be as follows：
| Sequence number | Sending time | Current state | Payload size | Payload |
Wherein,
Sequence number：Each data block is incremented by successively, reaches maximum 231Covered after -1；
Sending time：The time that current data block is sent, time precision can be millisecond；
Current state：Can include three kinds of states, be respectively data block it is to be sent, etc. to be answered, response success；
Payload size：The source data amount that current data block carries, every piece of size can be identical, last block can be less than
Or equal to block size；
Payload：Source data.
3rd, transmission of data blocks process can be as follows：
A. a certain amount of source data is obtained to be put into caching.
B. the good block of data point, every piece has specific sequence number, and state is " data block is to be sent ".
C. present system time is obtained before every piece of data sending and inserts " sending time ", send data block immediately；Data block
Caching retains, and state is changed to " waiting to be answered ".
D. the corresponding response bag of the data block sent in c is received, changes state as " response success "；
By detecting present system time compared with " sending time ", if it exceeds retransmission time out time RTO=3*RTT0
The response of corresponding blocks is also not received by, then the repeatedly operation of c, untill receiving the response of corresponding blocks.
E. the caching section of continuous sequence number is monitored, if being all " response success ", a is transferred to, otherwise, waits.
4. quick start, one second data block is sent with the maximum capacity of network, receiving terminal is from receiving this data block
First character section starts timing 1 second, records this data volume received for a period of time, and the benchmark sent is used as using this data volume
SND0；
5. network congestion judges, the response of each data block includes " sequence number " and " sending time ", takes present system time
Difference with " sending time " is the RTT of network at this time, and n such RTT are obtained within certain time and are compared, if full
Foot (RTT0+RTT0/2)<RTT1<RTT2<…<RTTn, i.e. n RTT value be in increasing trend, then illustrates that network enters congestion shape
State, on the contrary congestion, that is, bandwidth usage is not abundant enough for network.
6. flow control, according to the judging result of step 5, if network is in congestion state, then send window and reduce
SNDVar；Send window increase SNDVar if network does not have congestion, the value of SNDVar according to the congestion state duration and
Increase, such as SND0/20、SND0/10、SND0/ 5 etc.；SND0According to the result real-time update of receiving terminal constant feedback.
Embodiment 3,
Based on same inventive concept, a kind of local terminal network element is additionally provided in the embodiment of the present application, since these equipment solve
The principle of problem determines that method is similar to a kind of network congestion, therefore the implementation of these equipment may refer to the implementation of method, weight
Multiple part repeats no more.
Fig. 2 shows the structure diagram of local terminal network element in the embodiment of the present application, as shown in the figure, the local terminal network element can be with
Including：
Sending module, for sending data block to opposite end network element, the data block includes data block sending time；
Receiving module, the response bag sent for receiving opposite end network element, the response bag include the data block and send
Time；
Computing module, in preset time, according in the system time and the response bag when receiving response bag
Data block sending time, determine multiple network round-trip time delay RTT；
Determining module, for when the multiple RTT values are in increasing trend, it to be congestion state to determine the network.
In implementation, the local terminal network element may further include：
Data block determining module, for before the transmission data block to opposite end network element, communicating, determining with opposite end network element
Data block size after negotiation；
Data block division module, for carrying out piecemeal to source data according to the data block size.
In implementation, the initial value of the RTT is and the round-trip delay in the network element communication process of opposite end.
In implementation, the sending module can be further used for exceeding after the data block sending time default heavy
Time-out time is passed when not receiving the response bag of the data block still, obtains present system time as data block sending time,
The data block is resend to opposite end network element.
In implementation, the retransmission time out time can be the multiple of the RTT initial values.
In implementation, the local terminal network element may further include：
Module is adjusted, if being in congestion state for the network, the transmission window is reduced into SNDVar；If network does not have
There is congestion, by the transmission window increase SNDVar；The SNDVarValue increased, initial value according to the congestion state duration
To send the data block of preset time, the data volume that opposite end network element receives with network maximum capacity.
For convenience of description, each several part of apparatus described above is divided into various modules with function or unit describes respectively.
Certainly, each module or the function of unit can be realized in same or multiple softwares or hardware when implementing the application.
It should be understood by those skilled in the art that, embodiments herein can be provided as method, system or computer program
Product.Therefore, the application can use the reality in terms of complete hardware embodiment, complete software embodiment or combination software and hardware
Apply the form of example.Moreover, the application can use the computer for wherein including computer usable program code in one or more
The computer program production that usable storage medium is implemented on (including but not limited to magnetic disk storage, CD-ROM, optical memory etc.)
The form of product.
The application is with reference to the flow according to the method for the embodiment of the present application, equipment (system) and computer program product
Figure and/or block diagram describe.It should be understood that it can be realized by computer program instructions every first-class in flowchart and/or the block diagram
The combination of flow and/or square frame in journey and/or square frame and flowchart and/or the block diagram.These computer programs can be provided
The processors of all-purpose computer, special purpose computer, Embedded Processor or other programmable data processing devices is instructed to produce
A raw machine so that the instruction performed by computer or the processor of other programmable data processing devices, which produces, to be used in fact
The device for the function of being specified in present one flow of flow chart or one square frame of multiple flows and/or block diagram or multiple square frames.
These computer program instructions, which may also be stored in, can guide computer or other programmable data processing devices with spy
Determine in the computer-readable memory that mode works so that the instruction being stored in the computer-readable memory, which produces, to be included referring to
Make the manufacture of device, the command device realize in one flow of flow chart or multiple flows and/or one square frame of block diagram or
The function of being specified in multiple square frames.
These computer program instructions can be also loaded into computer or other programmable data processing devices so that counted
Series of operation steps is performed on calculation machine or other programmable devices to produce computer implemented processing, thus in computer or
The instruction performed on other programmable devices is provided and is used for realization in one flow of flow chart or multiple flows and/or block diagram one
The step of function of being specified in a square frame or multiple square frames.
Although having been described for the preferred embodiment of the application, those skilled in the art once know basic creation
Property concept, then can make these embodiments other change and modification.So appended claims be intended to be construed to include it is excellent
Select embodiment and fall into all change and modification of the application scope.
Claims (12)
1. a kind of network congestion determines method, it is characterised in that includes the following steps：
Data block is sent to opposite end network element, the data block includes data block sending time；
The response bag that opposite end network element is sent is received, the response bag includes the data block sending time；
In preset time, according to the data block sending time in the system time and the response bag when receiving response bag,
Determine multiple network round-trip time delay RTT；
When the multiple RTT values are in increasing trend, it is congestion state to determine the network.
2. the method as described in claim 1, it is characterised in that before the transmission data block to opposite end network element, further
Including：
Communicate with opposite end network element, determine the data block size after consulting；
Piecemeal is carried out to source data according to the data block size.
3. method as claimed in claim 2, it is characterised in that the initial value of the RTT be with the network element communication process of opposite end
Round-trip delay.
4. the method as described in claim 1, it is characterised in that further comprise：
If exceeding the default retransmission time out time after the data block sending time does not receive answering for the data block still
Bag is answered, present system time is obtained as data block sending time, the data block is resend to opposite end network element.
5. method as claimed in claim 4, it is characterised in that the retransmission time out time is the multiple of the RTT initial values.
6. the method as described in claim 1, it is characterised in that further comprise：
If the network is in congestion state, the transmission window is reduced into SNDVar；
If network does not have congestion, by the transmission window increase SNDVar；
The SNDVarValue increased according to the congestion state duration, initial value is when sending default with network maximum capacity
Between data block, the data volume that opposite end network element receives.
A kind of 7. local terminal network element, it is characterised in that including：
Sending module, for sending data block to opposite end network element, the data block includes data block sending time；
Receiving module, the response bag sent for receiving opposite end network element, the response bag include the data block sending time；
Computing module, in preset time, according to the number in the system time and the response bag when receiving response bag
According to block sending time, multiple network round-trip time delay RTT are determined；
Determining module, for when the multiple RTT values are in increasing trend, it to be congestion state to determine the network.
8. local terminal network element as claimed in claim 7, it is characterised in that further comprise：
Data block determining module, for before the transmission data block to opposite end network element, communicating with opposite end network element, determining to consult
Data block size afterwards；
Data block division module, for carrying out piecemeal to source data according to the data block size.
9. local terminal network element as claimed in claim 8, it is characterised in that the initial value of the RTT is to communicate with opposite end network element
Round-trip delay in journey.
10. local terminal network element as claimed in claim 7, it is characterised in that the sending module is further used in the data
When not receiving the response bag of the data block still more than the default retransmission time out time after block sending time, current system is obtained
The time unite as data block sending time, the data block is resend to opposite end network element.
11. local terminal network element as claimed in claim 10, it is characterised in that the retransmission time out time is the RTT initial values
Multiple.
12. local terminal network element as claimed in claim 7, it is characterised in that further comprise：
Module is adjusted, if being in congestion state for the network, the transmission window is reduced into SNDVar；If network is not gathered around
Plug, by the transmission window increase SNDVar；The SNDVarValue increased according to the congestion state duration, initial value be with
Network maximum capacity sends the data block of preset time, the data volume that opposite end network element receives.
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| CN112822117A (en) * | 2021-01-07 | 2021-05-18 | 厦门亿联网络技术股份有限公司 | Congestion detection method and device for real-time streaming media transmission |
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Application publication date: 20180501 |