CN103095434A - Data retransmission control method and device, and terminal equipment - Google Patents
Data retransmission control method and device, and terminal equipment Download PDFInfo
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Abstract
The invention discloses a data retransmission control method and a data retransmission control device, and terminal equipment. The method includes the steps: monitoring whether data sending retransmission timeout occurs; when the data sending retransmission timeout does not occur, calculating a transmission control protocol (TCP) time-out time interval according to two round-tripping time delay values which are selected from round-tripping values sent by data which are counted; after the data sending retransmission timeout occurs, a TCP time-out time interval which is used when the data sending retransmission timeout occurs is adjusted according to a newest round-tripping value sent by the counted data, and then obtaining the TCP time-out time interval which is after being adjusted. The method avoids that the time relay is too long or system overhead is too much.
Description
Technical field
The present invention relates to communication technical field, espespecially a kind of transmission control protocol (Transmission Control Protocol, TCP) data re-transmission control method and device, terminal equipment.
Background technology
It is exactly the data that confirmation is received from the other end that the present TCP of use provides one of method of transmitting, but the reception of the reception of data itself and data reception acknowledgement information all might be lost, in order to address this problem, generally adopt a timer that the reception of data confirmation of receipt information is controlled.For example set certain timing by timer, also do not receive data reception acknowledgement information when timing expires, think that the recipient does not receive the data of transmission, transmit leg is with data retransmission.
Overtime re-transmission during above-mentioned transfer of data, key are strategy overtime and that retransmit, namely how to determine the frequency that timeout interval and how to confirm retransmit.Timeout interval and retransmit frequency and determine will cause occurring a lot of problems in overtime retransmission processes when unreasonable, for example: timeout interval is oversize, will cause the re-transmission time long, data transmission efficiency and time delay reduction; The re-transmission frequency is excessive, will cause the too much expense of bandwidth resources, waste system resource.
The rational scheme timeout interval that can make and to retransmit frequency ratio more reasonable without comparison also in prior art can not be obtained the better re-transmission effect of acquisition in each side such as back off time and system resource overhead.
Summary of the invention
The embodiment of the present invention provides a kind of data re-transmission control method and device, terminal equipment, in order to solve the existing time interval and the re-transmission frequency that retransmit can not rationally determined, causes the problem that back off time is long or system resource overhead is too much.
A kind of data re-transmission control method comprises:
Whether monitoring data occur sends overtime re-transmission;
When the overtime re-transmission of data does not occur, according to two round-trip delay values choosing the round-trip delay value that sends from the data that count on, calculate transmission control protocol TCP timeout interval;
After the overtime re-transmission of data occurs, according to the up-to-date round-trip delay value that the data that count on send, the TCP timeout interval that occurs to use when data are overtime to be retransmitted is adjusted the TCP timeout interval after being adjusted.
A kind of data re-transmission control device comprises:
Monitoring means is used for the round-trip delay value that statistics sends;
The Retransmission control unit is used for monitoring whether the overtime re-transmission of data transmission occurs;
The interval calculation unit is used for when the overtime re-transmission of data does not occur, and according to two round-trip delay values choosing the round-trip delay value that sends from the data that count on, calculates transmission control protocol TCP timeout interval; After the overtime re-transmission of data occurs, according to the up-to-date round-trip delay value that the data that count on send, the TCP timeout interval that occurs to use when data are overtime to be retransmitted is adjusted the TCP timeout interval after being adjusted.
A kind of terminal equipment comprises above-mentioned data re-transmission control device.
Beneficial effect of the present invention is as follows:
The data re-transmission control method that the embodiment of the present invention provides and device, terminal equipment, when the overtime re-transmission of data does not occur when, according to two round-trip delay values choosing the round-trip delay value that sends from the data that count on, calculate transmission control protocol TCP timeout interval; After the overtime re-transmission of data occurs, according to the up-to-date round-trip delay value that the data that count on send, the TCP timeout interval that occurs to use when data are overtime to be retransmitted is adjusted the TCP timeout interval after being adjusted.Whether this mode overtime re-transmission occurs when sending data for current terminal equipment, for occuring and nonevent situation, determine in different ways timeout interval, can adjust timeout interval according to current network state, thereby timeout interval that can be different according to different condition monitorings, avoided the oversize re-transmission time that causes of timeout interval long, improved data transmission efficiency and reduced propagation delay time; Also avoid simultaneously retransmitting the too much expense of the excessive bandwidth resources that cause of frequency, saved system resource.The method can improve network transfer speeds, effect that can Fast Convergent after transmission is overtime.
Description of drawings
Accompanying drawing described herein is used to provide a further understanding of the present invention, consists of a part of the present invention, and illustrative examples of the present invention and explanation thereof are used for explaining the present invention, do not consist of improper restriction of the present invention.In the accompanying drawings:
Fig. 1 is the flow chart of data re-transmission control method in the embodiment of the present invention;
Fig. 2 is the structural representation of data re-transmission control device in the embodiment of the present invention;
Fig. 3 is the structural representation of realizing the terminal equipment of data re-transmission control in the embodiment of the present invention;
Fig. 4 is the time interval schematic diagram that adopts existing method to calculate in the embodiment of the present invention;
Fig. 5 is the time interval schematic diagram that adopts the application's method to calculate in the embodiment of the present invention.
Embodiment
In order to make technical problem to be solved by this invention, technical scheme and beneficial effect clearer, clear, below in conjunction with drawings and Examples, the present invention is further elaborated.Should be appreciated that specific embodiment described herein only in order to explain the present invention, is not intended to limit the present invention.
The embodiment of the present invention provides a kind of data re-transmission control method, according to whether the overtime re-transmission of data occurs, adopt diverse ways to determine transmission control protocol (Transmission Control Protocol, TCP) timeout interval (Retransmission Timeout, RTO), its flow process comprises the steps: as shown in Figure 1
Step S11: monitor data sends the round-trip delay value of overtime re-transmission and statistics transmission.
Terminal can be monitored the data reception acknowledgement information that the recipient returns after sending data, when receiving data reception acknowledgement information in the timeout interval of setting, thinks that the recipient has received the data that send, the round-trip delay that simultaneously can record data sends; If do not receive data reception acknowledgement information in the timeout interval of setting, can log-on data send overtime re-transmission.
Step S12: whether data occur send overtime re-transmission.
If not, execution in step S13; If, execution in step S15.
Step S13: two round-trip delay values choosing from the round-trip delay value that the data that count on send.Specifically comprise: according to the smoothing factor of setting, with statistics to the round-trip delay value set be divided into first subset and second subset; Choose value round-trip delay value maximum in round-trip delay value minimum in first subset and second subset as two round-trip delay values choosing.The round-trip delay value that all comprises less than first subset of all round-trip delay values of comprising of second subset wherein, wherein choosing of smoothing factor makes the round-trip delay value quantity that comprises in first subset less than the round-trip delay value quantity in second subset.
When the overtime re-transmission of data transmission does not occur when, adopt smoothing formula to calculate the RTO value, smoothing formula comprises a smoothing factor, also becomes constant factor.Calculating can be adopted shifting function.
With being divided into two subsets after the RTT value that counts on (normally Millisecond) set A sequence, for example set A is divided into first subset U and second subset B, wherein in second subset B all elements all less than the element in first subset U.The number of elements in set A for example, namely the quantity of RTT value is k, the number of elements in first subset U is that the number of elements in m and second subset B is n.
The number of elements in first subset U is that the number of elements in m and second subset B is that n is respectively: m=α k, n=(1-α) k;
Wherein α is smoothing factor, and is preferred, α＜1/2.
When α=1/8, can adopt the algorithm of three of moving to right, i.e. m＞＞=3 (radix-2 algorithm move to right three, expression is divided by 8).
In practice is calculated, may not be to be separated into ideally two subset B and U as above-mentioned formula, when not satisfying the integer separate type, can process by following mode, the element that soon can not confirm to assign in which subset divides in second subset U as far as possible, at this moment, generally will guarantee smoothing factor α＞1/k, during allocation elements, satisfy following condition: m＜α k and m+1＜α k in upwards half subset U and second subset B.Thereby divide exactly in the situation that do not satisfy, up-to-date RTT value is placed in second subset B.
Step S14: according to two round-trip delay values choosing the round-trip delay value that sends from the data that count on, calculate transmission control protocol TCP timeout interval.
Namely when the overtime re-transmission of data does not occur, according to two round-trip delay values choosing the round-trip delay value that sends from the data that count on, calculate transmission control protocol TCP timeout interval.Calculate transmission control protocol TCP timeout interval, specifically calculate the average of two round-trip delay values choosing as the TCP timeout interval.
In Assumption set B element on be limited to B0, the set U in element under be limited to U0, the computing formula of RTO is as follows: RTO=(B0+U0)/2, namely RTO=(B0+U0)＞＞1 (radix-2 algorithm move to right one, the expression divided by 2).
When the RTT value quantity in set A increased, the RTT value quantity in second subset B and first subset U was also increasing, thereby variation has also occured the RTO value that calculates thereupon, had realized adjusting in real time the RTO value according to the RTT value.
Step S15: according to the up-to-date round-trip delay value that the data that count on send, the TCP timeout interval that occurs to use when data are overtime to be retransmitted is adjusted.
After the overtime re-transmission of data occurs, according to the up-to-date round-trip delay value that the data that count on send, the TCP timeout interval that occurs to use when data are overtime to be retransmitted is adjusted the TCP timeout interval after being adjusted.The process of the TCP timeout interval after above-mentioned being adjusted specifically comprises: the difference of the TCP timeout interval that uses when the up-to-date round-trip delay value that the data that counting statistics arrives send retransmits with the generation data are overtime; The setting multiple that adds the above difference with the TCP timeout interval that occurs to use when data are overtime to be retransmitted, the TCP timeout interval after being adjusted.
Wherein, set 1～8 times of the span of multiple.
When the overtime re-transmission of data transmission occurs when, adopt and disperse formula calculating RTO value, calculate and also can adopt shifting function.
The last data that send in the RTT value that counts on successfully are subject to up-to-date round-trip delay value RTT and the RTO value RTO that overtime use occurs
0Differ from, the RTO value after adjustment satisfies following formula:
RTO＝RTO
0+β(RTT-RTO
0)
Wherein, the span of β can be set, and for example can get 1～8 arbitrary value.At present due to the general binary computations that adopts, for convenient calculate and improve the general value of computational speed be 1 or value be 2 multiple.Take value as 2 as example, RTO+=(RTT-RTO)＜＜2.
Whether periodicity or Real Time Monitoring the overtime re-transmission of data occurs, when data re-transmission occurs, employing is dispersed formula and is calculated timeout interval, when the message transmission is no longer overtime, switch back smoothing formula and calculate timeout interval, so just can guarantee message send overtime after, radiation and convergence fast.
Based on same inventive concept, the embodiment of the present invention also provides a kind of data re-transmission control device, and this device can be arranged in terminal equipment, and its structure comprises as shown in Figure 2: monitoring unit 10, Retransmission control unit 20, interval calculation unit 30.Wherein:
Monitoring means 10 is used for the round-trip delay value that statistics sends.
Preferably, above-mentioned interval calculation unit 30, concrete being used for according to the smoothing factor of setting, with statistics to the round-trip delay value set be divided into first subset and second subset; The round-trip delay value that all comprises less than first subset of all round-trip delay values of comprising of second subset wherein, choosing of described smoothing factor makes the round-trip delay value quantity that comprises in first subset less than the round-trip delay value quantity in second subset; Choose value round-trip delay value maximum in round-trip delay value minimum in first subset and second subset as two round-trip delay values choosing.
Preferably, above-mentioned interval calculation unit 30 specifically is used for calculating the average of two round-trip delay values choosing as the TCP timeout interval.
Preferably, above-mentioned interval calculation unit 30 specifically is used for the difference of the data up-to-date round-trip delay value that sends and the TCP timeout interval that occurs to use when data are overtime to be retransmitted that counting statistics arrives; The setting multiple that adds the above difference with the TCP timeout interval that occurs to use when data are overtime to be retransmitted, the TCP timeout interval after being adjusted.
As shown in Figure 3, said apparatus is arranged in terminal equipment 1, can realize data interaction between terminal equipment 1 and server 2, and terminal equipment sends message and receive data confirmation of receipt information by packet sending and receiving unit 40 to server 2.Monitoring unit 10 monitoring packet sending and receiving unit 40 obtains the round-trip delay value that data send, and Retransmission control unit 20 is controlled packet sending and receiving unit 40 and whether data occur sent overtime re-transmission.Interval calculation unit 30 calculates the RTO value according to the round-trip delay value that monitoring unit 10 statistics obtain.
Be illustrated in figure 4 as the signal of adopting the RTO value that the Jacobson algorithm that adopts in existing mode calculates according to the RTT value, the statistics of RTT value and the estimation track of RTO have been shown in Fig. 4, adopt as shown in Figure 5 the signal of the RTO value that the method that adopts in the embodiment of the present invention calculates according to the RTT value, the statistics of RTT value and the estimation track of RTO have been shown in Fig. 5, and the RTO value that obtains can smoothly be dispersed convergence fast.More visible the present invention can more press close to the RTO value of RTT set, and accomplishes to disperse fast convergence after generation is overtime.Because the RTO track that the present invention calculates is more pressed close to the RTT value set, thereby can save the plenty of time when overtime re-transmission, improve transmission bandwidth.
The data re-transmission control method that the embodiment of the present invention provides and device, terminal equipment, when the overtime re-transmission of data does not occur when, according to two round-trip delay values choosing the round-trip delay value that sends from the data that count on, calculate transmission control protocol TCP timeout interval; After the overtime re-transmission of data occurs, according to the up-to-date round-trip delay value that the data that count on send, the TCP timeout interval that occurs to use when data are overtime to be retransmitted is adjusted the TCP timeout interval after being adjusted.Whether this mode overtime re-transmission occurs when sending data for current terminal equipment, for occuring and nonevent situation, determine in different ways timeout interval, can adjust timeout interval according to current network state, thereby timeout interval that can be different according to different condition monitorings, avoided the oversize re-transmission time that causes of timeout interval long, improved data transmission efficiency and reduced propagation delay time; Also avoid simultaneously retransmitting the too much expense of the excessive bandwidth resources that cause of frequency, saved system resource.The method can improve network transfer speeds, can access the effect of Fast Convergent after transmission is overtime.
Above-mentioned explanation illustrates and has described a preferred embodiment of the present invention, but as previously mentioned, be to be understood that the present invention is not limited to the disclosed form of this paper, should not regard the eliminating to other embodiment as, and can be used for various other combinations, modification and environment, and can in invention contemplated scope described herein, change by technology or the knowledge of above-mentioned instruction or association area.And the change that those skilled in the art carry out and variation do not break away from the spirit and scope of the present invention, all should be in the protection range of the appended claim of the present invention.
Claims (10)
1. a data re-transmission control method, is characterized in that, comprising:
Whether monitoring data occur sends overtime re-transmission;
When the overtime re-transmission of data does not occur, according to two round-trip delay values choosing the round-trip delay value that sends from the data that count on, calculate transmission control protocol TCP timeout interval;
After the overtime re-transmission of data occurs, according to the up-to-date round-trip delay value that the data that count on send, the TCP timeout interval that occurs to use when data are overtime to be retransmitted is adjusted the TCP timeout interval after being adjusted.
2. the method for claim 1, is characterized in that, chooses two round-trip delay values from the round-trip delay value that the data that count on send, and specifically comprises:
According to the smoothing factor of setting, with statistics to the round-trip delay value set be divided into first subset and second subset; The round-trip delay value that all comprises less than first subset of all round-trip delay values of comprising of second subset wherein, choosing of described smoothing factor makes the round-trip delay value quantity that comprises in first subset less than the round-trip delay value quantity in second subset;
Choose value round-trip delay value maximum in round-trip delay value minimum in first subset and second subset as two round-trip delay values choosing.
3. the method for claim 1, is characterized in that, described calculating transmission control protocol TCP timeout interval specifically comprises:
The average of two round-trip delay values that calculating is chosen is as the TCP timeout interval.
4. described method as arbitrary in claim 1-3, is characterized in that, the process of the TCP timeout interval after described being adjusted specifically comprises:
The difference of the TCP timeout interval that uses when the up-to-date round-trip delay value that the data that counting statistics arrives send retransmits with the generation data are overtime;
The setting multiple that adds the above difference with the TCP timeout interval that occurs to use when data are overtime to be retransmitted, the TCP timeout interval after being adjusted.
5. method as claimed in claim 4, is characterized in that, 1～8 times of the span of described setting multiple.
6. a data re-transmission control device, is characterized in that, comprising:
Monitoring means is used for the round-trip delay value that statistics sends;
The Retransmission control unit is used for monitoring whether the overtime re-transmission of data transmission occurs;
The interval calculation unit is used for when the overtime re-transmission of data does not occur, and according to two round-trip delay values choosing the round-trip delay value that sends from the data that count on, calculates transmission control protocol TCP timeout interval; After the overtime re-transmission of data occurs, according to the up-to-date round-trip delay value that the data that count on send, the TCP timeout interval that occurs to use when data are overtime to be retransmitted is adjusted the TCP timeout interval after being adjusted.
7. device as claimed in claim 6, is characterized in that, described interval calculation unit specifically is used for:
According to the smoothing factor of setting, with statistics to the round-trip delay value set be divided into first subset and second subset; The round-trip delay value that all comprises less than first subset of all round-trip delay values of comprising of second subset wherein, choosing of described smoothing factor makes the round-trip delay value quantity that comprises in first subset less than the round-trip delay value quantity in second subset;
Choose value round-trip delay value maximum in round-trip delay value minimum in first subset and second subset as two round-trip delay values choosing.
8. device as claimed in claim 6, is characterized in that, described interval calculation unit specifically is used for: calculate the average of two round-trip delay values choosing as the TCP timeout interval.
9. described device as arbitrary in claim 6-8, is characterized in that, described interval calculation unit specifically is used for: the difference of the up-to-date round-trip delay value that the data that counting statistics arrives send and the TCP timeout interval that occurs to use when data are overtime to be retransmitted; The setting multiple that adds the above difference with the TCP timeout interval that occurs to use when data are overtime to be retransmitted, the TCP timeout interval after being adjusted.
10. a terminal equipment, is characterized in that, comprises described data re-transmission control device as arbitrary in claim 6-9.
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| CN105451260A (en) * | 2014-08-12 | 2016-03-30 | 优视科技有限公司 | Network request method, and method and device for measuring network fluctuation |
| CN105933242A (en) * | 2016-04-12 | 2016-09-07 | 北京大学深圳研究生院 | Method and system for improving TCP response speed of data center |
| CN107104763A (en) * | 2016-12-22 | 2017-08-29 | 腾讯科技（深圳）有限公司 | A kind of method and apparatus that Retransmission timeout duration is set |
| CN108880763A (en) * | 2018-06-27 | 2018-11-23 | 努比亚技术有限公司 | The time-optimized method of retransmission time out, equipment and computer readable storage medium |
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| CN109088828A (en) * | 2018-08-03 | 2018-12-25 | 网宿科技股份有限公司 | server overload control method and system |
| CN110677221A (en) * | 2018-07-02 | 2020-01-10 | 华为技术有限公司 | Retransmission control method, communication interface and electronic equipment |
| CN110768861A (en) * | 2019-09-20 | 2020-02-07 | 北京字节跳动网络技术有限公司 | Method, device, medium and electronic equipment for obtaining overtime threshold |
| CN112087349A (en) * | 2020-09-10 | 2020-12-15 | 新石器慧成(北京)科技有限公司 | Method, device and system for acquiring retransmission timeout value |
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| CN105451260A (en) * | 2014-08-12 | 2016-03-30 | 优视科技有限公司 | Network request method, and method and device for measuring network fluctuation |
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| CN108880763A (en) * | 2018-06-27 | 2018-11-23 | 努比亚技术有限公司 | The time-optimized method of retransmission time out, equipment and computer readable storage medium |
| CN110677221A (en) * | 2018-07-02 | 2020-01-10 | 华为技术有限公司 | Retransmission control method, communication interface and electronic equipment |
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| CN109088828A (en) * | 2018-08-03 | 2018-12-25 | 网宿科技股份有限公司 | server overload control method and system |
| CN109039932A (en) * | 2018-08-03 | 2018-12-18 | 网宿科技股份有限公司 | Server and its overload controlling method |
| CN109088828B (en) * | 2018-08-03 | 2022-07-26 | 网宿科技股份有限公司 | Server overload control method and system |
| CN110768861A (en) * | 2019-09-20 | 2020-02-07 | 北京字节跳动网络技术有限公司 | Method, device, medium and electronic equipment for obtaining overtime threshold |
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| CN112134645B (en) * | 2020-08-04 | 2024-03-29 | 国电南瑞科技股份有限公司 | Distributed terminal communication quality monitoring method, storage medium and computing device |
| CN112087349A (en) * | 2020-09-10 | 2020-12-15 | 新石器慧成(北京)科技有限公司 | Method, device and system for acquiring retransmission timeout value |
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