CN103856304A - Reliable file transmission protocol with selectable safety levels - Google Patents
Reliable file transmission protocol with selectable safety levels Download PDFInfo
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- CN103856304A CN103856304A CN201410060462.2A CN201410060462A CN103856304A CN 103856304 A CN103856304 A CN 103856304A CN 201410060462 A CN201410060462 A CN 201410060462A CN 103856304 A CN103856304 A CN 103856304A
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Abstract
The invention discloses a reliable file transmission protocol with selectable safety levels. The reliable file transmission protocol with the selectable safety levels is characterized in that on the basis of a CFDP, the reliable file transmission protocol with the selectable safety levels is achieved, and three modes are included, wherein the first mode is the non-confirmation mode that unreliable transmission is used for transmission tasks which are not high in QoS requirement and are only in one-way communication; the second mode includes that the fountain code mode is adopted for limit transmission tasks with long delay and high error rate or transmission tasks which require QoS but are only in one-way communication; the third mode includes that the immediately denied confirmation mode is adopted for transmission tasks in both-way communication. The fountain code mode is adopted, on the basis of the CFDP, the reliable file transmission protocol with the selectable safety levels is provided, selectable reliable and unreliable transmission is provided for users according to service requirements, and reliability of information is ensured greatly.
Description
Technical field
The invention belongs to software transmission area of agreement, specifically, relate to a kind of reliable file host-host protocol of optional safe class.
Background technology
In order to meet the requirement of deep space communication network to reliable file transmission, CCSDS has proposed CFDP(CCSDS File Delivery Protocol) agreement, to improve in large transmission range, the stability of transfer of data in the deep space network of high link delay.
CFDP provides selectable reliable and unreliable transmission for user, wherein unreliable transmission is without affirmation mode, be difficult to guarantee integrality and the correctness of file transfer, fairly simple owing to implementing without affirmation mode, not high to device requirement, more therefore can use this pattern to the less demanding transformation task of Qos.Transmitting adopts negative response mechanism, when Reliability Assurance is provided, reduce the mutual of agreement control command, and then reduce the expense of signaling in document transmission process, prolong the feature of holding the large communication delay of circuit network for appearance, CFDP has also adopted delay reply acknowledgement mechanism further to reduce the control signal stand-by period in document transmission process, is guaranteeing under the reliability prerequisite of file transfer, has reduced to hold and has prolonged the transmission time of holding data file in circuit network.
Because the transmitting of CFDP agreement carries out error control based on request retransmission mechanism, this just causes CFDP in the time that communication channel error rate is very high to receive and just can complete file transfer through too much wheel transmission, and ask each time, retransmit, transmitting terminal all needs to wait at least one RTT, due to the existence of communication link long delay, its protocol transmission performance is still very low.
Summary of the invention
The technical problem to be solved in the present invention is to overcome above-mentioned defect, a kind of reliable file host-host protocol of optional safe class is provided, on CFDP protocol basis, the reliable file host-host protocol of optional safe class has been proposed, provide selectable reliable and unreliable transmission according to business demand for user, the reliability of maximum guarantee information.
For addressing the above problem, the technical solution adopted in the present invention is:
A kind of reliable file host-host protocol of optional safe class, it is characterized in that: on CFDP protocol basis, realize the reliable file host-host protocol of optional safe class, simultaneously for user provides selectable reliable and unreliable transmission, the reliability of maximum guarantee information;
Pattern one: less demanding for Qos, and the transformation task that can only carry out one-way communication uses unreliable transmission, without affirmation mode;
Pattern two: for the limit transformation task of long delay, high bit-error, or require Qos but can only carry out the transformation task of one-way communication, adopt fountain codes pattern;
Pattern three: for the transformation task that can carry out two-way communication, adopt Negative Acknowledgement pattern immediately.
Improve as one, in described pattern two: ftp file transfer protocol is simply divided into several packets file in the time of coding, adopt request retransmission mechanism to guarantee that all packets all receive received side accurately; The cataloged procedure of fountain codes is the random coded process to file, can obtain the almost coded sequence of any amount to limited file data information, and do not consider channel probability of erasure, when receiving terminal receives abundant correct data bag just can decoding success and recover source file, this code check independence of the digital fountain code therefore distributing based on degree just in time can adapt to hold prolong holds the channel circumstance that circuit network constantly changes.
Improve as one, described fountain codes coding need to be through three steps, i.e. degree of randomness generation, coded identification generate and coding; Decoding fountain codes process need knows in advance which initial data coding generates and sends data, and therefore decoding fountain codes need to be through three steps, wait for receive initial data, according to initial data, decode all data and decoding finishes.
Improve as one, described fountain codes model application is in file transfer protocol (FTP):
(1), first transmitting terminal is constructed transmission metadata PDU the information such as file path, size is sent to receiving terminal, open metadata timer simultaneously, timer expiry set of time is a RTT, when time-out time not to or transmitting terminal receive ACK META, transmitting terminal constantly carries out fountain codes coding to file data, and sends, when time-out time arrives, and transmitting terminal does not receive the ACK META from receiving terminal, transmitting terminal retransmits metadata PDU;
(2), receiving terminal receives the data from transmitting terminal, when metadata PDU loses, receiving terminal cannot initiating file transfer unit, waits for that transmitting terminal metadata timer expiry retransmits metadata PDU, when receiving metadata PDU, receiving terminal is according to the parameter initialization receiving terminal file transfer unit of metadata PDU transmission, and structure sends ACK META, after the unit initialization of receiving terminal file transfer, receiving terminal carries out fountain codes decoding to received data, until all correct receptions of all data of file, receiving terminal structure sends finished PDU, notice transmitting terminal end of file transfer, discharge the shared resource of this file transfer transmitting terminal, open finished timer simultaneously, timer expiry set of time is a RTT, arrive and do not receive ACK FIN when the timer expiry time, retransmit finished PDU, when receiving ACK FIN, transmitting terminal discharges the shared resource of this file transfer, this end of file transfer,
(3), when transmitting terminal receives the finished PDU from receiving terminal, stop coding and send packet, discharge the shared resource of this file transfer, and structure sends ACK FIN, this end of file transfer.
Owing to having adopted technique scheme, compared with prior art, what the present invention adopted is fountain codes pattern, on CFDP protocol basis, the reliable file host-host protocol of optional safe class has been proposed, provide selectable reliable and unreliable transmission according to business demand for user, the reliability of maximum guarantee information.
Embodiment
Embodiment:
A reliable file host-host protocol for optional safe class, on CFDP protocol basis, realizes the reliable file host-host protocol of optional safe class, simultaneously for user provides selectable reliable and unreliable transmission, and the reliability of maximum guarantee information.Wherein include three kinds of patterns:
Pattern one: less demanding for Qos, and the transformation task that can only carry out one-way communication uses unreliable transmission, without affirmation mode;
Pattern two: for the limit transformation task of long delay, high bit-error, or require Qos but can only carry out the transformation task of one-way communication, adopt fountain codes pattern;
Pattern three: for the transformation task that can carry out two-way communication, adopt Negative Acknowledgement pattern immediately.
In the present embodiment, in described pattern two: ftp file transfer protocol is simply divided into several packets file in the time of coding, adopt request retransmission mechanism to guarantee that all packets all receive received side accurately; The cataloged procedure of fountain codes is the random coded process to file, can obtain the almost coded sequence of any amount to limited file data information, and do not consider channel probability of erasure, when receiving terminal receives abundant correct data bag just can decoding success and recover source file, this code check independence of the digital fountain code therefore distributing based on degree just in time can adapt to hold prolong holds the channel circumstance that circuit network constantly changes.
Described fountain codes coding need to be through three steps, i.e. degree of randomness generation, coded identification generate and coding; Decoding fountain codes process need knows in advance which initial data coding generates and sends data, and therefore decoding fountain codes need to be through three steps, wait for receive initial data, according to initial data, decode all data and decoding finishes.
Specifically, described fountain codes model application is in file transfer protocol (FTP):
(1), first transmitting terminal is constructed transmission metadata PDU the information such as file path, size is sent to receiving terminal, open metadata timer simultaneously, timer expiry set of time is a RTT, when time-out time not to or transmitting terminal receive ACK META, transmitting terminal constantly carries out fountain codes coding to file data, and sends, when time-out time arrives, and transmitting terminal does not receive the ACK META from receiving terminal, transmitting terminal retransmits metadata PDU;
(2), receiving terminal receives the data from transmitting terminal, when metadata PDU loses, receiving terminal cannot initiating file transfer unit, waits for that transmitting terminal metadata timer expiry retransmits metadata PDU, when receiving metadata PDU, receiving terminal is according to the parameter initialization receiving terminal file transfer unit of metadata PDU transmission, and structure sends ACK META, after the unit initialization of receiving terminal file transfer, receiving terminal carries out fountain codes decoding to received data, until all correct receptions of all data of file, receiving terminal structure sends finished PDU, notice transmitting terminal end of file transfer, discharge the shared resource of this file transfer transmitting terminal, open finished timer simultaneously, timer expiry set of time is a RTT, arrive and do not receive ACK FIN when the timer expiry time, retransmit finished PDU, when receiving ACK FIN, transmitting terminal discharges the shared resource of this file transfer, this end of file transfer,
(3), when transmitting terminal receives the finished PDU from receiving terminal, stop coding and send packet, discharge the shared resource of this file transfer, and structure sends ACK FIN, this end of file transfer.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, all any modifications of doing within the spirit and principles in the present invention, be equal to and replace and improvement etc., within all should being included in protection scope of the present invention.
Claims (4)
1. a reliable file host-host protocol for optional safe class, is characterized in that: on CFDP protocol basis, realize the reliable file host-host protocol of optional safe class, comprise three kinds of patterns;
Pattern one: less demanding for Qos, and the transformation task that can only carry out one-way communication uses unreliable transmission, without affirmation mode;
Pattern two: for the limit transformation task of long delay, high bit-error, or require Qos but can only carry out the transformation task of one-way communication, adopt fountain codes pattern;
Pattern three: for the transformation task that can carry out two-way communication, adopt Negative Acknowledgement pattern immediately.
2. according to the reliable file host-host protocol of the optional safe class described in claim 1, it is characterized in that: in described pattern two: ftp file transfer protocol is simply divided into several packets file in the time of coding, adopt request retransmission mechanism to guarantee that all packets all receive received side accurately; The cataloged procedure of fountain codes is the random coded process to file, can obtain the almost coded sequence of any amount to limited file data information, and do not consider channel probability of erasure, when receiving terminal receives abundant correct data bag just can decoding success and recover source file, this code check independence of the digital fountain code therefore distributing based on degree just in time can adapt to hold prolong holds the channel circumstance that circuit network constantly changes.
3. according to the reliable file host-host protocol of the optional safe class described in claim 2, it is characterized in that: described fountain codes coding need to be through three steps, i.e. degree of randomness generation, coded identification generate and coding; Decoding fountain codes process need knows in advance which initial data coding generates and sends data, and therefore decoding fountain codes need to be through three steps, wait for receive initial data, according to initial data, decode all data and decoding finishes.
4. according to the reliable file host-host protocol of the optional safe class described in claim 3, it is characterized in that: described fountain codes model application is in file transfer protocol (FTP):
(1), first transmitting terminal is constructed transmission metadata PDU the information such as file path, size is sent to receiving terminal, open metadata timer simultaneously, timer expiry set of time is a RTT, when time-out time not to or transmitting terminal receive ACK META, transmitting terminal constantly carries out fountain codes coding to file data, and sends, when time-out time arrives, and transmitting terminal does not receive the ACK META from receiving terminal, transmitting terminal retransmits metadata PDU;
(2), receiving terminal receives the data from transmitting terminal, when metadata PDU loses, receiving terminal cannot initiating file transfer unit, waits for that transmitting terminal metadata timer expiry retransmits metadata PDU, when receiving metadata PDU, receiving terminal is according to the parameter initialization receiving terminal file transfer unit of metadata PDU transmission, and structure sends ACK META, after the unit initialization of receiving terminal file transfer, receiving terminal carries out fountain codes decoding to received data, until all correct receptions of all data of file, receiving terminal structure sends finished PDU, notice transmitting terminal end of file transfer, discharge the shared resource of this file transfer transmitting terminal, open finished timer simultaneously, timer expiry set of time is a RTT, arrive and do not receive ACK FIN when the timer expiry time, retransmit finished PDU, when receiving ACK FIN, transmitting terminal discharges the shared resource of this file transfer, this end of file transfer,
(3), when transmitting terminal receives the finished PDU from receiving terminal, stop coding and send packet, discharge the shared resource of this file transfer, and structure sends ACK FIN, this end of file transfer.
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105656932A (en) * | 2016-03-01 | 2016-06-08 | 中国传媒大学 | Emergency news collecting method and system oriented to user-generated content |
| CN106477488A (en) * | 2015-08-31 | 2017-03-08 | 爱知株式会社公司 | The communicator of working rig |
| CN109412750A (en) * | 2018-09-19 | 2019-03-01 | 西安交通大学 | Anti- eavesdropping transmission method based on fountain codes in a kind of multimedia communication |
| CN110392366A (en) * | 2018-04-16 | 2019-10-29 | 特科电子产品（新加坡）有限公司 | Carry out system, the method and apparatus of wireless files transmission |
| CN111741013A (en) * | 2020-07-21 | 2020-10-02 | 炬芯（珠海）科技有限公司 | Data transmission method and device |
| CN112055088A (en) * | 2020-09-11 | 2020-12-08 | 南京通达海科技股份有限公司 | Optical gate-based file reliable transmission system and method thereof |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106477488A (en) * | 2015-08-31 | 2017-03-08 | 爱知株式会社公司 | The communicator of working rig |
| CN105656932A (en) * | 2016-03-01 | 2016-06-08 | 中国传媒大学 | Emergency news collecting method and system oriented to user-generated content |
| CN110392366A (en) * | 2018-04-16 | 2019-10-29 | 特科电子产品（新加坡）有限公司 | Carry out system, the method and apparatus of wireless files transmission |
| CN109412750A (en) * | 2018-09-19 | 2019-03-01 | 西安交通大学 | Anti- eavesdropping transmission method based on fountain codes in a kind of multimedia communication |
| CN109412750B (en) * | 2018-09-19 | 2020-03-31 | 西安交通大学 | Anti-eavesdrop transmission method based on fountain codes in multimedia communication |
| CN111741013A (en) * | 2020-07-21 | 2020-10-02 | 炬芯（珠海）科技有限公司 | Data transmission method and device |
| CN112055088A (en) * | 2020-09-11 | 2020-12-08 | 南京通达海科技股份有限公司 | Optical gate-based file reliable transmission system and method thereof |
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Application publication date: 20140611 |