CN105406915B - A kind of document transmission method towards satellite-ground link - Google Patents
A kind of document transmission method towards satellite-ground link Download PDFInfo
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- CN105406915B CN105406915B CN201510672682.5A CN201510672682A CN105406915B CN 105406915 B CN105406915 B CN 105406915B CN 201510672682 A CN201510672682 A CN 201510672682A CN 105406915 B CN105406915 B CN 105406915B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/14—Relay systems
- H04B7/15—Active relay systems
- H04B7/185—Space-based or airborne stations; Stations for satellite systems
- H04B7/18578—Satellite systems for providing broadband data service to individual earth stations
- H04B7/18586—Arrangements for data transporting, e.g. for an end to end data transport or check
Abstract
The invention discloses a kind of document transmission method towards satellite-ground link, step is：S1：The link detection stage；Transmitting terminal estimates the available bandwidth and round-trip delay RTT of link；S2：Stablize transmission phase；Transmitting terminal keeps transmission rate close to available bandwidth according to the result of step S1, and the transmitting of data is completed using negative acknowledgment retransmission mechanism.The present invention can improve file transmission performance and transmission reliability.
Description
Technical field
Present invention relates generally to technical field of satellite communication, refer in particular to a kind of document transmission method towards satellite-ground link.
Background technology
With the development of the communication technology and space technology, satellite communication in recent years is rapidly developed.Currently, defending
Star communication has been applied to the every field such as military surveillance, navigator fix, resource observation, disaster prevention, becomes in modern society
Indispensable means of communication.However, different from traditional wire, wireless communication, satellite communication also has its own without eliminable
Limitation is mainly reflected in link error rates (BER) height and long two aspects of round-trip delay (RTT), is with geostationary satellite
Example, link error rates (BER) are 10-7Rank, postpones to star about 260ms, and round-trip delay (RTT) is up to 540ms.
Just because of above-mentioned characteristic, at present in traditional communication based on the File Transfer Protocol of Transmission Control Protocol applied to defending
Star communicate when, there is file transmission success rates it is relatively low, transmission time is long the shortcomings of, when this is primarily due to longer round-trip
Prolonging causes TCP congestion control windows to be opened slowly, is unable to fully utilize bandwidth；And packet loss is mistaken as line caused by random error
Road congestion causes the multiplying property of congestion window to reduce, transmission performance is made more to deteriorate.There is also mutual effects for these two aspects, single
Aspect increases window, and the data volume retransmitted is needed when can aggravate to occur packet loss.
In addition to the File Transfer Protocol based on Transmission Control Protocol in traditional communication, current numerous novel transport protocols also by
It proposes, wherein being introduced by taking CFDP agreements and Saratoga agreements as an example.
In the 1990s, USA space data Advisory Board (CCSDS) is in order to support various complexity in deep space network
Under scene can reliable transmitting data, formulated CCSDS File Transfer Protocol (CCFDP).CFDP can be provided according to business demand
Unreliable transmission and transmitting both of which, and there are four types of negative acknowledgement (Negative for transmitting pattern
Acknowledgement, NAK) pattern is available, and it is NAK (Immediate NAK), triggering NAK (Prompt immediately respectively
NAK), asynchronous NAK (Asynchronous NAK) and delay NAK (Deferred NAK).
2004, SSTL (Surrey Satellite Technology Ltd) in IP-based disaster monitoring in order to defend
Image file is transmitted on star, it is proposed that establish simple, lightweight the File Transfer Protocol on UDP --- Saratoga associations
View.Saratoga agreements carry out Fault recovery by simple negative acknowledgment retransmission mechanism, how pay close attention in finite time
The interior efficient utilization to link.Saratoga agreements are directed to the satellite communication under special scenes, need that link is known in advance
Condition, thus there is no good supporting roles for, round-trip delay unknown for available bandwidth (RTT) uncertain satellite-ground link.
In conclusion above-mentioned traditional approach has the following problems：
1, it is excessively complicated or excessively single to be directed to scene, is not particularly suited for common satellite-ground link.
2, the error control mode used can not in time retransmit the data of loss, and file transmission time is longer.
Invention content
The technical problem to be solved in the present invention is that：For technical problem of the existing technology, the present invention provides one
Kind can improve the document transmission method towards satellite-ground link of file transmission performance and transmission reliability.
In order to solve the above technical problems, the present invention uses following technical scheme：
A kind of document transmission method towards satellite-ground link, step are：
S1：The link detection stage；Transmitting terminal estimates the available bandwidth and round-trip delay RTT of link；
S2：Stablize transmission phase；Transmitting terminal keeps transmission rate close to available bandwidth according to the result of step S1, and makes
The transmitting of data is completed with negative acknowledgment retransmission mechanism.
As a further improvement on the present invention：In the link detection stage, transmitting terminal dynamic adjustment transmission rate carries out more wheels
Whether detection, the round-trip delay RTT by detecting packet in observation each round detection show apparent increasing trend to judge to work as
Whether preceding transmission rate is more than available bandwidth；When the estimated value of available bandwidth is accurate in preset range, terminate detection.
As a further improvement on the present invention：Use the average value for the round-trip delay RTT that packet is detected in last wheel detection
Estimated value as link Round-Trip time delay RTT.
As a further improvement on the present invention：In the link detection stage, transmitting terminal uses the DATA messages with timestamp
It is wrapped as detection, receiving terminal can return to the STATUS messages with identical time stamp immediately after receiving such DATA message, send
End receives the difference of calculating current time and timestamp after STATUS messages, which is to detect the round-trip delay RTT of packet.
As a further improvement on the present invention：Transmitting terminal judges currently to detect packet by calculating two parameter PCT and PDT
RTT whether have apparent increase tendency；Assuming that each round detection has recorded K RTT value, respectively { R1, R2...,
RK, the RTT values of record are averaged low be divided intoA subsegment, i-th section of RTT medians are Ri, calculate Wherein I (X) is a jump function, when X be logical truth, functional value 1,
Otherwise functional value is 0；
If PCT is more than 0.66 and PDT and is more than 0.55 and PCT not less than 0.54 not less than 0.45 or PDT, judge
Rate R is more than available bandwidth；
If PCT is less than 0.54 and PDT and is less than 0.45 and PCT no more than 0.66 no more than 0.55 or PDT, judge
Rate R is less than available bandwidth；
Remaining situation is that can not judge.
As a further improvement on the present invention：Stablizing transmission phase, transmitting terminal periodically asks receiving terminal feedback negative
Confirmation message, the size in period aggravate to pass the time lost message and needed at least over a round-trip delay RTT.
Compared with the prior art, the advantages of the present invention are as follows：The present invention the document transmission method towards satellite-ground link, be
Based on the document transmission method of negative acknowledgment retransmission mechanism, file transmission performance and transmission reliability can be improved.In data transmission
In the process, link condition is detected first so that it is not only applicable to specific satellite-ground link, also need not artificially set
Set link parameter.Moreover, transmitting terminal by periodic request negative acknowledgment information, is completed, to losing the re-transmission of data, to be not required in time
The data of loss are repeatedly retransmitted again after data are sent completely, reduce the time that file transmission needs.
Description of the drawings
Fig. 1 is the flow diagram of the present invention.
Fig. 2 is flow diagram of the present invention in the concrete application example link detection phase.
Fig. 3 is the flow diagram that the present invention stablizes transmission phase in concrete application example.
Specific implementation mode
The present invention is described in further details below with reference to Figure of description and specific embodiment.
As shown in FIG. 1 to 3, the document transmission method of the invention towards satellite-ground link, step are：
S1：The link detection stage；
Transmitting terminal estimates the available bandwidth and round-trip delay (RTT) of link；
In the link detection stage, transmitting terminal dynamic adjustment transmission rate carries out more wheel detections, by observing each round detection
Whether the round-trip delay (RTT) of middle detection packet shows apparent increasing trend to judge it is available whether currently transmitted rate is more than
Bandwidth；When the estimated value of available bandwidth is accurate within the scope of some, terminate detection.
In above process, what may further be optimized takes turns the round-trip delay (RTT) that packet is detected in detection using last
Estimated value of the average value as link Round-Trip time delay (RTT).
S2：Stablize transmission phase；
Transmitting terminal keeps transmission rate close to available bandwidth, and the reliable biography of data is completed using negative acknowledgment retransmission mechanism
It is defeated.
Stablizing transmission phase, transmitting terminal periodically asks receiving terminal to feed back negative acknowledgment information, and the size in period is at least
Should be more than that a round-trip delay (RTT) aggravates to pass the time for losing message needs.
Shown in Figure 2, in the present embodiment, in the link detection stage, transmitting terminal uses the DATA with timestamp to report
Text can return to the STATUS messages with identical time stamp immediately as detection packet, receiving terminal after receiving such DATA message, send out
Sending end receives the difference of calculating current time and timestamp after STATUS messages, which is to detect the round-trip delay (RTT) of packet.
Transmitting terminal judges whether the RTT for currently detecting packet has apparent increase by calculating two parameter PCT and PDT
Trend.Assuming that each round detection has recorded K RTT value, respectively { R1, R2..., RK, the RTT values of record is average low
It is divided intoA subsegment, i-th section of RTT medians are Ri, calculate Wherein I (X) is a jump function, and when X is logical truth, functional value 1, otherwise functional value is 0；
If PCT is more than 0.66 and PDT and is more than 0.55 and PCT not less than 0.54 not less than 0.45 or PDT, judge
Rate R is more than available bandwidth；
If PCT is less than 0.54 and PDT and is less than 0.45 and PCT no more than 0.66 no more than 0.55 or PDT, judge
Rate R is less than available bandwidth；
Remaining situation can not judge.
In the present embodiment, transmitting terminal is according to parameter Rmin、RmaxAnd the result of last round of detection adjusts transmission rate,
Remember that last round of detection rate is R (n), the detection rate of epicycle is R (n+1), situation discussion during speed adjust can be divided into 3：
1) judge that transmission rate is more than available bandwidth, update Rmax=R (n), detection rate R (n+1)=(Rmax+Rmin)/2；
2) judge that transmission rate is less than available bandwidth, update Rmin=R (n), detection rate R (n+1)=(Rmax+Rmin)/2；
3) it can not judge, keep Rmin、RmaxIt is constant, detection rate R (n+1)=(R (n)+Rmax)/2；
Rmax-RminValue be gradually reduced in detection process, work as Rmin/RmaxWhen >=ω, detection terminates, and keeps transmission rate
Equal to Rmin, wherein RminInitial value, RmaxInitial value, initial transmission rate, ω can be arranged as required to.
The above is only the preferred embodiment of the present invention, protection scope of the present invention is not limited merely to above-described embodiment,
All technical solutions belonged under thinking of the present invention all belong to the scope of protection of the present invention.It should be pointed out that for the art
For those of ordinary skill, several improvements and modifications without departing from the principles of the present invention should be regarded as the protection of the present invention
Range.
Claims (4)
1. a kind of document transmission method towards satellite-ground link, which is characterized in that step is：
S1：The link detection stage；Transmitting terminal estimates the available bandwidth and round-trip delay RTT of link；
S2：Stablize transmission phase；Transmitting terminal keeps transmission rate close to available bandwidth according to the result of step S1, and using negative
Confirm that retransmission mechanism completes the transmitting of data；
In the link detection stage, transmitting terminal uses the DATA messages with timestamp to be wrapped as detection, and receiving terminal receives such
The STATUS messages with identical time stamp can be returned to after DATA messages immediately, transmitting terminal calculates currently after receiving STATUS messages
The difference of time and timestamp, the value are to detect the round-trip delay RTT of packet；
Transmitting terminal judges whether the RTT for currently detecting packet there is apparent increase to become by calculating two parameter PCT and PDT
Gesture；Assuming that each round detection has recorded K RTT value, respectively { R1, R2..., RK, the RTT values of record is low point average
AtA subsegment, i-th section of RTT medians are Ri, calculate
Wherein I (X) is a jump function, and when X is logical truth, functional value 1, otherwise functional value is 0；
If PCT is more than 0.66 and PDT and is more than 0.55 and PCT not less than 0.54 not less than 0.45 or PDT, rate is judged
R is more than available bandwidth；
If PCT is less than 0.54 and PDT and is less than 0.45 and PCT no more than 0.66 no more than 0.55 or PDT, rate is judged
R is less than available bandwidth；
Remaining situation is that can not judge.
2. the document transmission method according to claim 1 towards satellite-ground link, which is characterized in that in link detection rank
Section, transmitting terminal dynamic adjustment transmission rate carry out more wheel detections, detect the round-trip delay RTT of packet in each round detection by observing
Whether apparent increasing trend is showed to judge whether currently transmitted rate is more than available bandwidth；When the estimated value of available bandwidth
When being accurate in preset range, terminate detection.
3. the document transmission method according to claim 2 towards satellite-ground link, which is characterized in that visited using last wheel
Estimated value of the average value of the round-trip delay RTT of packet as link Round-Trip time delay RTT is detected in survey.
4. the document transmission method according to claim 1 or 2 or 3 towards satellite-ground link, which is characterized in that sent out stablizing
Send stage, transmitting terminal that receiving terminal is periodically asked to feed back negative acknowledgment information, the size in period is at least over a round-trip delay
RTT, which aggravates to pass, loses the time that message needs.
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| CN201510672682.5A CN105406915B (en) | 2015-10-16 | 2015-10-16 | A kind of document transmission method towards satellite-ground link |
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| CN105406915B true CN105406915B (en) | 2018-10-26 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110166366B (en) * | 2018-02-14 | 2023-02-28 | 华为技术有限公司 | Network congestion control method, device and system |
| CN113839840B (en) * | 2021-11-24 | 2022-02-18 | 北京航空航天大学 | Bandwidth self-adaptive estimation method and system for bottleneck link of satellite network |
| CN114745042B (en) * | 2022-03-28 | 2023-12-19 | 广东天镝科技有限公司 | Method and device for transmitting data of broadband and narrowband integrated satellite network |
| CN115694608B (en) * | 2022-10-19 | 2023-09-12 | 航天科工空间工程网络技术发展(杭州)有限公司 | Satellite network management method |
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