CN105119695A - Space file transmission method based on quick negative acknowledgement (NAK) - Google Patents
Space file transmission method based on quick negative acknowledgement (NAK) Download PDFInfo
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- CN105119695A CN105119695A CN201510595502.8A CN201510595502A CN105119695A CN 105119695 A CN105119695 A CN 105119695A CN 201510595502 A CN201510595502 A CN 201510595502A CN 105119695 A CN105119695 A CN 105119695A
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- Prior art keywords
- nak
- file
- timer
- transmission
- packet
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Classifications
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
- H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
- H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
- H04L1/1806—Go-back-N protocols
Abstract
The invention discloses a space file transmission method based on a quick negative acknowledgement (NAK), belonging to the technical field of satellite communication. The space file transmission method comprises the following steps that: connection between a file sending end and a file receiving end is established through request/response interaction; the sending end transmits a data packet to the receiving end; transmitted data ends in an EOF (End of File) command frame; the receiving end feeds back an FIN command frame after transmission of all data packets is successfully completed; after the sending end completes transmission of the data packets, the receiving end feeds back a packet supply request NAK and starts an NAK timer if checking that some data packets are not received correctly; the NAK is quickly retransmitted if the timer still does not receive the supplied packet retransmitted by the sending end in the expiry date; and the sending end feeds back a file transmission end acknowledgement after receiving the FIN command frame. A command error-correcting mechanism, an NAK quick retransmission mechanism and an NAK frame structure compression mechanism are adopted; a space link environment can be effectively adaptive; the file transmission handling capacity and the file transmission efficiency are improved; and the space file transmission method disclosed by the invention has the advantages of being short in file transmission time and high in handling capacity.
Description
Technical field
The invention belongs to technical field of satellite communication, particularly a kind of space file transmission method based on Quick Not Acknowledgement.
Background technology
Along with the fast development of space technology, the disposal ability of spacecraft (satellite) constantly strengthens, and adopt the various spaces application of on-board processing technical support more and more abundanter, file transfer protocol (FTP) is one of basic agreement supporting various space service.There is the features such as long delay, high bit-error, link asymmetry due to spatial network, the TCP/FTP protocol application of extensive use in terrestrial interconnection net there will be send window and increasess slowly, packet loss thought congested by mistake and reduce send window, confirm that passback bag makes the problems such as reverse link congestion in a large number in spatial network, and being difficult to directly apply to spatial network carries out file transfer; CCSDS (ConsultativeCommitteeforSpaceDataSystems, consultative committee for space data system) propose CFDP (CCSDSFileDeliveryProtocol, CCSDS file transfer protocol (FTP)), realize transmitting by four kinds of Negative Acknowledgement mechanism.But higher in link error rates, under link rate asymmetric case, there is the problems such as signaling Packet Error Ratio higher (not protecting signaling), reverse link overhead be larger in CFDP agreement, performance still has room for promotion.Therefore, the present invention proposes a kind of space file transmission method based on Quick Not Acknowledgement, has low file transmission time, the advantage of high-throughput.
Summary of the invention
The object of the invention is to propose a kind of space file transmission method based on Quick Not Acknowledgement, it is characterized in that, comprise the steps:
1) file transmitting terminal and file reception end are by asking/replying to connect alternately;
2) file transmitting terminal be connected with file reception end just continuous after, file transmitting terminal starts to file reception end transmission packet, and the data transmitted end up with EOF command frame; After being successfully completed all data packet transmission, file reception end feedback FIN command frame, logo file transmission success;
3) after file transmitting terminal completes data packet transmission, if the verification of file reception end has packet not to be correctly received, then file reception end feedback mends bag request NAK, and opens NAK timer; If timer expires receive the benefit bag of file transmitting terminal re-transmission not yet, then Fast retransmission NAK is to reduce file transmission time;
4) after file transmitting terminal receives FIN command frame, the feedback file end of transmission is replied, and mark one time document transmission process terminates.
Described EOF command frame and FIN command frame fixed length, the transmission of EOF command frame and FIN command frame utilizes the byte of padding of link adaptation to carry out correction process to signaling; Be specially and redundancy encoding is carried out to EOF command frame and the filling of FIN command frame afterbody.
Described benefit bag request NAK is fixed length bag, have employed frame structure compress technique and reduces expense; Benefit bag request NAK is with packet number but not offset pointer represents packet loss, and each packet loss accounts for 2 bytes; This frame structure compression method by the average packet length of NAK by 8N
lp/N
nAK-Sbecome 2N
l/ N
nAK-S, wherein, N
l/ N
nAK-Sfor the average repeat time of NAK; P is the ratio of average continuous wrong hop count and erroneous packets number in retransmission packet, is less than 10 in link error rates
-4time, P>0.9.
Described NAK timer comprises NAK timer timer
1with NAK timer timer
2; NAK timer timer
1for Fast retransmission NAK, NAK timer timer
2for triggering the transmission of NAK next time; Be specially:
timer
1＝2×T
PROP+T
PDU+T
NAK
timer
2＝(N
L-1)T
PDU
Wherein, T
pROPrepresent propagation delay; T
pDUrepresent the forward delay interval of packet; T
nAKrepresent the forward delay interval mending bag request NAK; N
lfor request retransmission mends bag number.
The invention has the beneficial effects as follows to there is for existing space document transmission method the problem that file transmission time is long, throughput is low, propose a kind of space file transmission method based on Quick Not Acknowledgement, order mechanism for correcting errors, NAK fast retransmission mechanism, NAK frame structure compression mechanism is have employed in document transmission process, can effectively adapt to space link environment, promote the throughput of file transfer, improve file transmission efficiency, there is low file transmission time, the advantage of high-throughput.
Accompanying drawing explanation
Fig. 1 is the space file transmission method flow chart based on Quick Not Acknowledgement.
Fig. 2 is the frame structure schematic diagram in document transmission process.
Fig. 3 is the flow chart of node A from Node B download file.
Fig. 4 is the flow chart of node A from Node B upload file.
Embodiment
The present invention proposes a kind of space file transmission method based on Quick Not Acknowledgement, elaborates to the present invention below in conjunction with the drawings and specific embodiments.
Figure 1 shows that the space file transmission method flow chart based on Quick Not Acknowledgement, comprise the steps:
1) file transmitting terminal and file reception end are by asking/replying to connect alternately;
2) file transmitting terminal be connected with file reception end just continuous after, file transmitting terminal starts to file reception end transmission packet, and the data transmitted end up with EOF (EndOfFile) command frame; After being successfully completed all data packet transmission, file reception end feedback FIN (Finished) command frame, logo file transmission success;
3) after file transmitting terminal completes data packet transmission, if the verification of file reception end has packet not to be correctly received, then file reception end feedback mends bag request NAK, and opens NAK timer; If timer expires receive the benefit bag of file transmitting terminal re-transmission not yet, then Fast retransmission NAK is to reduce file transmission time;
4) after file transmitting terminal receives FIN command frame, the feedback file end of transmission is replied, and mark one time document transmission process terminates.
Wherein, EOF command frame and FIN command frame fixed length, the transmission of EOF command frame and FIN command frame utilizes the byte of padding of link adaptation to carry out correction process to signaling, under the prerequisite not increasing overhead, reduces signaling Packet Error Ratio, improves efficiency of transmission; Be specially and redundancy encoding is carried out to EOF command frame and the filling of FIN command frame afterbody, the content of EOF command frame and FIN command frame half is carried out repeated encoding, can effectively reduce command frame error probability, make order frame error probability by 1-(1-P
b)
lreduce to (1-(1-P
b)
l/2)
2, in above formula, P
bfor link error rates; L is that signaling bag is long, and then reduces file transmission time.The byte of padding that redundancy encoding make use of link adaptation is carried out to signaling, generally can not increase overhead.
Wherein, mending bag request NAK is fixed length bag, have employed frame structure compress technique and reduces expense to promote file transmission efficiency; Benefit bag request NAK is with packet number but not offset pointer represents packet loss, and each packet loss accounts for 2 bytes; This frame structure compression method by the average packet length of NAK by 8N
lp/N
nAK-Sbecome 2N
l/ N
nAK-S, wherein, N
l/ N
nAK-Sfor the average repeat time of NAK; P is the ratio of average continuous wrong hop count and erroneous packets number in retransmission packet, is less than 10 in link error rates
-4time, P>0.9.Compared to CFDP, the NAK bag average packet of the space file transmission method based on Quick Not Acknowledgement that the present invention proposes is long less, particularly in the asymmetrical environment of space link, reverse link rate is lower, and the compression of NAK frame structure can improve file transmission efficiency greatly.
Wherein, NAK timer comprises NAK timer timer
1with NAK timer timer
2; NAK timer timer
1for Fast retransmission NAK, NAK timer timer
2for triggering the transmission of NAK next time; Be specially:
timer
1＝2×T
PROP+T
PDU+T
NAK
timer
2＝(N
L-1)T
PDU
Wherein, T
pROPrepresent propagation delay; T
pDUrepresent the forward delay interval of packet; T
nAKrepresent the forward delay interval mending bag request NAK; N
lfor request retransmission mends bag number.The space file transmission method based on Quick Not Acknowledgement that the present invention proposes has waited for a timer less when retransmitting NAK
2, thus reduce file transmission time.
Fig. 2 is the frame structure schematic diagram in document transmission process, and the frame structure in document transmission process is divided into command frame and Frame two kinds, adopts data frame transfer file fragment, and the stream sequence number of its Frame is continuous print (stream sequence number is from 0); For the Frame of non-ending, its effective payload is 118 bytes; The Frame of last ending, its effective payload is elongated, and afterbody 0x55 fills.Under this expression way, from ability to express angle, the maximum length of a file fragment permission is 3776KB, and the storage capacity demand file fragment length of actual spaceborne controller (OBC) is less than 1MB.The breakpoint transmission function that the space file transmission method supporting document based on Quick Not Acknowledgement that the present invention proposes transmits, not for transfer files safeguards special task configuration file, breakpoint transmission function depends on the comparison of institute's transfer files size and adds.
The present invention with node A from Node B download file, node A from Node B upload file for specific embodiment.
Fig. 3 is the flow chart of node A from Node B download file, and concrete steps are as follows:
Step 301) node A action: send conversation initialization request; Node B action: response conversation initialization success;
Step 302) node A action: send logging request; Node B action: response logins successfully;
Step 303) node A action: send download list file request; Node B action: the inventory list file description information of response current directory;
Step 304) node A action: send to specify and download fragment request (download be the inventory list file of current directory); Node B action: response is specified and downloaded fragment response;
Step 305) node A action: send and start fragment download request; Node B action: response starts fragment and downloads response;
Step 306) node A action: nothing; Node B action: start the first bag data sending fragment, the second bag data and follow-up data, distribute all data of this fragment always;
Step 307) node A action: whether the bag sequence number verifying this fragment is complete, if there is disappearance, then sends segments-segment and downloads the request of benefit bag; Node B action: send and mend bag packet;
Step 308) node A action: nothing; Node B action: after mending bag Packet Generation, response fragment is downloaded and is mended bag response;
Step 309) node A action: after verification bag sequence number is complete, calculate fragment CRC32, verification succeeds then sends end fragment download request; If fragment verifies unsuccessfully, then from step 304) again download fragment; Node B action: response end fragment downloads response; If inventory list file exists repeat step 304 more than 1 fragment) ~ 309) download multiple fragment; Node A verifies All Files fragment and has downloaded, verification complete file content.Successful then current directory inventory list file download completes;
Step 310) node A action: send end session request; Node B action: response end session response.
Fig. 4 is the flow chart of node A from Node B upload file, and concrete steps are as follows:
Step 401) node A action: send the request of upload file descriptor; Node B action: response upload file descriptor response;
Step 402) node A action: send appointment and upload fragment request; Node B action: fragment response is uploaded in response appointment;
Step 403) node A action: send and start fragment upload request; Node B action: response starts fragment and uploads response;
Step 404) node A action: start the first bag data sending fragment, the second bag data and follow-up data, distribute all data of this fragment always; Calculate all data upload of this fragment complete, send fragment and upload check request; Node B action: verification fragment bag sequence number is complete, and check word is correct, then response fragment is uploaded to verify and is replied successfully; If disappearance, bag is mended in response, still points out to mend bag number and corresponding sequence number in command word; If check word comparison mistake, replying and mending bag number is 0, verifies unsuccessfully, now needs ground station to reissue all bags;
Step 405) node A action: send and mend bag data; Again send fragment upload check request, until receive fragment upload verification reply successfully; Node B action: response verification fragment bag sequence number is complete, and check word is correct;
Step 406) node A action: send fragment and upload ending request; Node B action: response end fragment uploads response; Repeat step 402)-406), send remaining fragment;
Step 407) node A action: send files passe check request; Node B action: verification complete file check word, answer file uploads verification response;
Step 408) node A action: send end session request; Node B action: response end session response.
The present invention proposes a kind of space file transmission method based on Quick Not Acknowledgement, user adopts in the process of the method download or upload file, by sending file fragment download or upload request, reception packet, verification and request benefit bag, confirming correctly to receive, achieve the download of file fragment or upload, successfully downloading or upload All Files fragment and namely successfully downloaded whole file.
Order mechanism for correcting errors is have employed, in the EOF command frame and FIN command frame of fixed length, because afterbody is filled in document transmission process, the content of its half is carried out repeated encoding, command frame error probability can be reduced, reduce command frame number of retransmissions in transmitting procedure, and then reduce file transmission time.
NAK fast retransmission mechanism is have employed in document transmission process, NAK timer length is set to by receiving terminal: NAK forward delay interval+Packet Generation time delay+two-way time, the time that first is mended bag can be received, if NAK makes a mistake in transmitting procedure like this, receiving terminal can when this timer expires, the very first time finds and retransmits NAK, can reduce file transmission time.
Have employed NAK frame structure compression mechanism in document transmission process, NAK adopts fixed length frame, with 2 byte representation packet loss, if the upper limit that packet loss number can represent more than a NAK frame, then needs to send next NAK frame, until all packet losses all represent complete.Such NAK frame structure can reduce NAK data volume, and then reduces file transmission time.
Compared to existing space file transmission method, the present invention propose based in the space file transmission method of Quick Not Acknowledgement, the byte of padding that the transmission of command frame make use of link adaptation carries out correction process to signaling, under the prerequisite not increasing overhead, reduce signaling Packet Error Ratio, improve efficiency of transmission; NAK (NegativeAcknowledgment) Fast retransmission and NAK frame structure compression mechanism is utilized to reduce file transmission time and decrease expense.Therefore, the space file transmission method based on Quick Not Acknowledgement that the present invention proposes can effectively adapt to space link environment, promotes the throughput of file transfer, improves file transmission efficiency, has low file transmission time, the advantage of high-throughput.
The above; be only the present invention's preferably embodiment, but protection scope of the present invention is not limited thereto, is anyly familiar with those skilled in the art in the technical scope that the present invention discloses; the change that can expect easily or replacement, all should be encompassed within protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with the protection range of claim.
Claims (4)
1., based on a space file transmission method for Quick Not Acknowledgement, it is characterized in that, comprise the steps:
1) file transmitting terminal and file reception end are by asking/replying to connect alternately;
2) file transmitting terminal be connected with file reception end just continuous after, file transmitting terminal starts to file reception end transmission packet, and the data transmitted end up with EOF command frame; After being successfully completed all data packet transmission, file reception end feedback FIN command frame, logo file transmission success;
3) after file transmitting terminal completes data packet transmission, if the verification of file reception end has packet not to be correctly received, then file reception end feedback mends bag request NAK, and opens NAK timer; If timer expires receive the benefit bag of file transmitting terminal re-transmission not yet, then Fast retransmission NAK is to reduce file transmission time;
4) after file transmitting terminal receives FIN command frame, the feedback file end of transmission is replied, and mark one time document transmission process terminates.
2. a kind of space file transmission method based on Quick Not Acknowledgement according to claim 1, it is characterized in that, described EOF command frame and FIN command frame fixed length, the transmission of EOF command frame and FIN command frame utilizes the byte of padding of link adaptation to carry out correction process to signaling; Be specially and redundancy encoding is carried out to EOF command frame and the filling of FIN command frame afterbody.
3. a kind of space file transmission method based on Quick Not Acknowledgement according to claim 1, is characterized in that, described benefit bag request NAK is fixed length bag, have employed frame structure compress technique and reduces expense; Benefit bag request NAK is with packet number but not offset pointer represents packet loss, and each packet loss accounts for 2 bytes; This frame structure compression method by the average packet length of NAK by 8N
lp/N
nAK-Sbecome 2N
l/ N
nAK-S, wherein, N
l/ N
nAK-Sfor the average repeat time of NAK; P is the ratio of average continuous wrong hop count and erroneous packets number in retransmission packet, is less than 10 in link error rates
-4time, P>0.9.
4. a kind of space file transmission method based on Quick Not Acknowledgement according to claim 1, it is characterized in that, described NAK timer comprises NAK timer timer
1with NAK timer timer
2; NAK timer timer
1for Fast retransmission NAK, NAK timer timer
2for triggering the transmission of NAK next time; Be specially:
timer
1＝2×T
PROP+T
PDU+T
NAK
timer
2＝(N
L-1)T
PDU
Wherein, T
pROPrepresent propagation delay; T
pDUrepresent the forward delay interval of packet; T
nAKrepresent the forward delay interval mending bag request NAK; N
lfor request retransmission mends bag number.
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| CN201510595502.8A CN105119695A (en) | 2015-09-17 | 2015-09-17 | Space file transmission method based on quick negative acknowledgement (NAK) |
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|---|---|---|---|
| CN201510595502.8A CN105119695A (en) | 2015-09-17 | 2015-09-17 | Space file transmission method based on quick negative acknowledgement (NAK) |
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| Publication Number | Publication Date |
|---|---|
| CN105119695A true CN105119695A (en) | 2015-12-02 |
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| CN110913431A (en) * | 2019-11-27 | 2020-03-24 | 深圳云博智联科技有限公司 | Data wireless transmission method and device, computer equipment and storage medium |
| CN113162821A (en) * | 2021-03-25 | 2021-07-23 | 深圳金三立视频科技股份有限公司 | Data transmission method and terminal |
| CN113921158A (en) * | 2021-10-08 | 2022-01-11 | 北京广利核系统工程有限公司 | Nuclear power station DCS equipment fault analysis method and device |
| CN114422024A (en) * | 2022-04-01 | 2022-04-29 | 深圳航天东方红卫星有限公司 | Satellite-ground closed loop high-reliability data transmission method |
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Application publication date: 20151202 |
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