CN115550246A - File transmission method and device based on multiple paths - Google Patents
File transmission method and device based on multiple paths Download PDFInfo
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- CN115550246A CN115550246A CN202211242067.7A CN202211242067A CN115550246A CN 115550246 A CN115550246 A CN 115550246A CN 202211242067 A CN202211242067 A CN 202211242067A CN 115550246 A CN115550246 A CN 115550246A
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- 230000005540 biological transmission Effects 0.000 title claims abstract description 190
- 238000000034 method Methods 0.000 title claims abstract description 23
- 239000012634 fragment Substances 0.000 claims abstract description 75
- 238000001514 detection method Methods 0.000 claims description 6
- 230000003111 delayed effect Effects 0.000 claims description 5
- 230000007547 defect Effects 0.000 description 2
- 230000000903 blocking effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 230000002085 persistent effect Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 230000001052 transient effect Effects 0.000 description 1
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L45/00—Routing or path finding of packets in data switching networks
- H04L45/24—Multipath
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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
- H04L1/004—Arrangements for detecting or preventing errors in the information received by using forward error control
- H04L1/0041—Arrangements at the transmitter end
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L45/00—Routing or path finding of packets in data switching networks
- H04L45/12—Shortest path evaluation
- H04L45/128—Shortest path evaluation for finding disjoint paths
- H04L45/1283—Shortest path evaluation for finding disjoint paths with disjoint links
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L67/00—Network arrangements or protocols for supporting network services or applications
- H04L67/01—Protocols
- H04L67/06—Protocols specially adapted for file transfer, e.g. file transfer protocol [FTP]
Abstract
The invention discloses a file transmission method based on multipath, which comprises the following steps: acquiring the number N of network lines between a target node and a current node, and dividing a file to be transmitted into N fragments; establishing a transmission connection connected to a target node in each line, wherein each transmission connection downloads a fragment, and each fragment is different from each other; under the condition that transmission of file fragments on a certain line is completed, searching the line with the largest remaining fragment to be transmitted on the rest N-1 lines, dividing the fragment to be transmitted into a first fragment and a second fragment, and downloading the second fragment to the line which is completed with transmission for transmission; and repeating the previous step until the transmission of the file to be transmitted is completed. The method can use a plurality of lines, the slow line does not drag the transmission speed of the slow line, and after the fast line finishes the transmission of the data fragments to be transmitted which are primarily distributed, the transmission tasks of the slow line can be shared until the file transmission is finished.
Description
Technical Field
The invention belongs to the technical field of file transmission, and particularly relates to a file transmission method, a file transmission device, file transmission equipment and a storage medium based on multipath.
Background
In the prior art, the traditional file transmission tool based on the TCP protocol can only use a single path for transmission, but cannot simultaneously use the bandwidth of multiple networks. Although MP-TCP supports multi-path transmission, since the TCP protocol itself is a streaming general transmission protocol, it can only transmit within the range of TCP sliding window, and if packet loss occurs on the network, it needs to wait for retransmission. In a multi-line scenario, MP-TCP may need to wait for the transmission data of a slower or poorer line frequently, which may not only increase the transmission speed but also slow down the transmission speed. Specifically, the process of directly using TCP to perform file transmission is as follows: establishing a connection by using a TCP Socket; transmitting file data from the beginning; and when an error occurs, the TCP connection is reestablished, and the transmission is continued from the position of the last transmission until the file transmission is finished. The disadvantage of this solution is that only a single network line can be used, and the speed is limited.
In addition, in the prior art, multiPath-TCP is also used for file transmission, and the flow is as follows: when a plurality of network lines exist, TCP handshake is respectively carried out on each line, and related information of a MultiPath is carried; when TCP stream data is transmitted, distributing a source file to a plurality of lines in a TCP stream data form according to a certain proportion according to the condition of each line; the receiving end collects data from a plurality of lines, recombines the data according to the serial number of the TCP, restores TCP stream data and sequentially writes the TCP stream data into a target file; if data of a certain line is lost, the lost data block needs to be retransmitted by the line or other lines to ensure the arrival of the data. This scheme has the advantage of being able to use multiple lines, and has the disadvantage that since a single piece of TCP stream data is being delivered, packet loss on a line can cause a pause or delay in the transmission of TCP stream data. That is, the file transfer needs to wait for the arrival of the slowest line data or a timeout retry, resulting in some cases in that the speed of multi-line transfer is still slow, possibly even slower than using only a single line.
In summary, the prior art generally has the defect that transmission rate is limited due to transmission only by using a single line, or transmission performance is low due to limitation of partial line delay, packet loss or blocking even if transmission is performed by using a plurality of lines.
Disclosure of Invention
In order to solve the above problems, an object of the present invention is to provide a file transmission method and apparatus based on multiple paths, where multiple paths are not used, and the multiple paths do not affect each other, a slow path does not drag the transmission speed of a fast path, and each path transmits at its own maximum speed, and after the fast path completes its own transmission of partial data, it can share the transmission task of the slow path until the file transmission is finished.
In order to achieve the purpose, the technical scheme of the invention is as follows: a file transmission method based on multipath comprises the following steps: acquiring the number N of network lines between a target node and a current node, and dividing a file to be transmitted into N fragments; establishing a transmission connection connected to a target node on each line, and downloading a fragment on each transmission connection, wherein each fragment is different from each other; under the condition that transmission of file fragments on a certain line is completed, searching the line with the largest remaining fragment to be transmitted on the rest N-1 lines, dividing the fragment to be transmitted into a first fragment and a second fragment, and downloading the second fragment to the line which is completed with transmission for transmission; and repeating the previous step until the transmission of the file to be transmitted is completed.
The invention can not only use a plurality of lines, but also can not influence each other among the plurality of lines, the slow line can not drag the transmission speed of the slow and fast lines, each line can transmit at the maximum speed of the line, and after the fast line finishes the transmission of partial data of the line, the transmission task of the slow line can be shared until the file transmission is finished.
Preferably, the establishing of a transmission connection to the destination node is performed on each line, where the transmission connection is a TCP protocol connection, and when a transmission error occurs on a certain line, the line is continuously used to perform a delayed retry, an interval of the retry increases exponentially, and a loop is restarted until the transmission is recovered after a certain threshold is reached.
By setting the above rules to delay retry to continue transmitting data, the purpose of retransmission without large impact on the whole transmission can be achieved.
Preferably, a transmission connection connected to the target node is established on each line, where the transmission connection is a TCP protocol connection, and when transmission on a certain line is faulty, the fragment to be transmitted on the other lines is downloaded after the transmission of the fragment is completed.
Since the TCP protocol is a streaming general transmission protocol, in order to avoid that the delay of a certain line affects the transmission efficiency of the whole file, after the transmission of a certain line is completed in a fragmented manner, the transmission pressure of the line with a slow transmission speed can be borne, thereby achieving the purpose of improving the transmission efficiency of the whole file.
Preferably, the transmission connection connected to the target node is established in each line, where the transmission connection is a UDP protocol connection, and file data of a UDP packet is stored when the UDP packet is received, so as to avoid discarding and retransmitting of cached data due to packet loss to the maximum extent. The disadvantages of TCP streaming transmission can be avoided at the source.
Preferably, the UDP protocol connection uses an FEC forward error correction algorithm, and round-trip time overhead and influence on transmission speed caused by packet loss detection and retransmission are avoided by sending redundant data.
After the technical scheme is adopted, compared with the prior art, the invention has the advantages that:
1. the invention can not only use a plurality of lines, but also can not influence each other among the plurality of lines, the slow line can not drag the transmission speed of the slow and fast lines, each line can transmit at the maximum speed of the line, and after the fast line finishes the transmission of partial data of the line, the transmission task of the slow line can be shared until the file transmission is finished.
2. The invention shares the file fragments to be transmitted of the line with the maximum residual transmission pressure by the line which preferentially completes fragment transmission, thereby achieving the purposes of balancing tasks and resources and improving transmission performance.
3. The invention is suitable for TCP transmission protocol, and can improve inherent defects of TCP stream transmission.
4. The invention is suitable for UDP transmission protocol, and the file data of one UDP packet is stored after receiving one UDP packet, thereby avoiding the discarding and the retransmission of the cached data caused by packet loss to the maximum extent. The disadvantages of TCP streaming transmission can be avoided at the source. Meanwhile, an FEC forward error correction algorithm is adopted, and round-trip time overhead and influence on transmission speed caused by packet loss detection and retransmission are avoided through sending of redundant data.
Drawings
The following detailed description of embodiments of the invention is provided in conjunction with the appended drawings, in which:
FIG. 1 is a flowchart of a multi-path-based file transfer method according to the present invention;
FIG. 2 is a diagram illustrating software implementation steps of a file transmission method based on multiple paths according to the present invention.
Detailed Description
The invention is described in further detail below with reference to the figures and specific examples. Advantages and features of the present invention will become apparent from the following description and from the claims. It is to be noted that the drawings are in a very simplified form and are all used in a non-precise ratio for the purpose of facilitating and distinctly aiding in the description of the embodiments of the invention.
It should be noted that all the directional indicators (such as upper, lower, left, right, front, and rear … …) in the embodiment of the present invention are only used to explain the relative position relationship between the components, the motion situation, and the like in a specific posture (as shown in the drawing), and if the specific posture is changed, the directional indicator is changed accordingly.
Example one
Referring to fig. 1, a file transmission method based on multiple paths includes the following steps:
s100, acquiring the number N of network lines between a target node and a current node, and dividing a file to be transmitted into N fragments;
the file to be transmitted can be equally divided into N fragments, or can be divided into fragments based on the detected transmission condition of each line, the file to be transmitted is divided into fragments based on the division result, the lines with good transmission environment are distributed with more transmission file fragments, and the lines with poor transmission environment are distributed with less transmission file fragments.
S200, establishing a transmission connection connected to a target node in each line, and downloading a fragment in each transmission connection, wherein the fragments are different from each other;
s300, under the condition that the transmission of the file fragments on a certain line is completed, searching the line with the largest remaining fragments to be transmitted on the other N-1 lines, dividing the fragments to be transmitted into a first fragment and a second fragment, and downloading the second fragment to the line which is completed with the transmission for transmission;
after the transmission of the task is completed, the line with good transmission performance finds the line with the heaviest task at present to help the line to share the transmission task.
And S400, repeating the loop S300 until the transmission of the file to be transmitted is completed.
The invention can not only use a plurality of lines, but also can not influence each other among the plurality of lines, the slow line can not drag the transmission speed of the slow and fast lines, each line can transmit at the maximum speed of the line, and after the fast line finishes the transmission of partial data of the line, the transmission task of the slow line can be shared until the file transmission is finished.
Preferably, referring to fig. 2, a transmission connection connected to the destination node is established on each line, where the transmission connection is a TCP protocol connection, and in the case of a transmission error on a certain line, the line is continuously used to perform a delayed retry, and the retry interval increases exponentially, and after reaching a certain threshold, the loop is restarted until the transmission is recovered.
By setting the above rules to delay retry to continue transmitting data, the purpose of retransmission without large impact on the whole transmission can be achieved.
Preferably, a transmission connection connected to the target node is established on each line, where the transmission connection is a TCP protocol connection, and when transmission on a certain line is faulty, the fragment to be transmitted on the other lines is downloaded after the transmission of the fragment is completed.
Since the TCP protocol is a streaming general transmission protocol, in order to avoid that the delay of a certain line affects the transmission efficiency of the whole file, after the transmission of a certain line is completed in a fragmented manner, the transmission pressure of the line with a slow transmission speed can be borne, thereby achieving the purpose of improving the transmission efficiency of the whole file.
Preferably, a transmission connection connected to the target node is established in each line, where the transmission connection is a UDP protocol connection, and file data of one UDP packet is stored when one UDP packet is received, so as to avoid discarding and retransmitting cached data due to packet loss to the greatest extent. The disadvantages of TCP streaming transmission can be avoided at the source.
Preferably, the UDP protocol connection uses an FEC forward error correction algorithm, and round-trip time overhead and influence on transmission speed caused by packet loss detection and retransmission are avoided by sending redundant data. When the fragments are transmitted, 10% of redundancy of each fragment is reserved, so that when the data of packet loss during transmission is just in the range, packet loss detection and retransmission can be avoided, and the transmission performance can be improved to a certain extent.
Example two
Based on the same concept, the present embodiment provides a file transfer apparatus based on multipath, including: the acquisition module is used for acquiring the number N of network lines between a target node and a current node and dividing a file to be transmitted into N fragments; a connection establishing module, configured to establish a transmission connection to a target node in each line, where each transmission connection downloads a segment, and each segment is different from each other; the transmission module is used for searching the line with the largest remaining fragment to be transmitted on the rest N-1 lines under the condition that the transmission of the file fragments on a certain line is finished, dividing the fragment to be transmitted into a first fragment and a second fragment, and downloading the second fragment to the line which is finished with the transmission for transmission; and repeating the previous step until the transmission of the file to be transmitted is completed.
Preferably, the transmission connection is a TCP protocol connection, and when a transmission error occurs in a certain line, the line is continuously used to retry the delay, and the retry interval increases exponentially, and when the certain threshold is reached, the loop is restarted until the transmission is resumed.
The data is continuously transmitted by delaying retry through the rule setting, so that the aim of retransmitting the data and not causing large impact on the whole transmission is fulfilled.
Optionally, the transmission connection may also be a UDP protocol connection, and when a UDP packet is received, the file data of the UDP packet is stored, so that discarding and retransmission of cached data caused by packet loss are avoided to the maximum extent. The disadvantages of TCP streaming transmission can be avoided at the source.
EXAMPLE III
Based on the same concept, the present embodiments provide a computer device, which may have relatively large differences due to different configurations or performances, and may include one or more processors (CPUs) (e.g., one or more processors) and a memory, one or more storage media (e.g., one or more mass storage devices) storing applications or data. The memory and storage medium may be, among other things, transient or persistent storage. The program stored on the storage medium may include one or more modules (not shown), each of which may include a sequence of instructions operating on the computer device. Further, the processor may be configured to communicate with the storage medium to execute a series of instruction operations in the storage medium on the computer device.
The computer device may also include one or more power supplies, one or more wired or wireless network interfaces, one or more input-output interfaces, and/or one or more operating systems, such as Windows Server, mac OS X, unix, linux, freeBSD, and the like.
Those skilled in the art will appreciate that the computer device architecture of the present embodiment is not intended to be limiting of computer devices and may include more or fewer components or a combination of certain components or a different arrangement of components.
The computer readable instructions, when executed by the processor, cause the processor to perform the steps of: acquiring the number N of network lines between a target node and a current node, and dividing a file to be transmitted into N fragments; establishing a transmission connection connected to a target node in each line, wherein each transmission connection downloads a fragment, and each fragment is different from each other; under the condition that transmission of file fragments on a certain line is completed, searching the line with the largest remaining fragment to be transmitted on the rest N-1 lines, dividing the fragment to be transmitted into a first fragment and a second fragment, and downloading the second fragment to the line which is completed with transmission for transmission; and repeating the previous step until the transmission of the file to be transmitted is completed.
Preferably, the establishing of a transmission connection to the destination node is performed on each line, where the transmission connection is a TCP protocol connection, and when a transmission error occurs on a certain line, the line is continuously used to perform a delayed retry, an interval of the retry increases exponentially, and a loop is restarted until the transmission is recovered after a certain threshold is reached.
Preferably, a transmission connection connected to the target node is established on each line, where the transmission connection is a TCP protocol connection, and when transmission on a certain line is faulty, the fragment to be transmitted on the other lines is downloaded after the transmission of the fragment is completed.
Preferably, the transmission connection connected to the target node is established in each line, where the transmission connection is a UDP protocol connection, and file data of a UDP packet is stored when the UDP packet is received, so as to avoid discarding and retransmitting of cached data due to packet loss to the maximum extent. The disadvantages of TCP streaming transmission can be avoided at the source.
Preferably, the UDP protocol connection uses an FEC forward error correction algorithm, and round-trip time overhead and influence on transmission speed due to packet loss detection and retransmission are avoided by sending redundant data.
In an embodiment, a readable storage medium is provided, and the computer readable instructions, when executed by one or more processors, cause the one or more processors to perform the above multipath-based file transmission method, and specific steps are not described herein again.
It can be clearly understood by those skilled in the art that, for convenience and simplicity of description, the specific working processes of the above-described systems, apparatuses and units may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.
The integrated unit, if implemented in the form of a software functional unit and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present invention may be embodied in the form of a software product, which is stored in a storage medium and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned storage medium includes: various media capable of storing program codes, such as a usb disk, a removable hard disk, a read-only memory (ROM), a Random Access Memory (RAM), a magnetic disk, or an optical disk.
The above-mentioned embodiments are only used for illustrating the technical solutions of the present invention, and not for limiting the same; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (10)
1. A file transmission method based on multipath is characterized by comprising the following steps:
acquiring the number N of network lines between a target node and a current node, and dividing a file to be transmitted into N fragments;
establishing a transmission connection connected to a target node in each line, wherein each transmission connection downloads a fragment, and each fragment is different from each other;
under the condition that transmission of file fragments on a certain line is completed, searching the line with the largest remaining fragment to be transmitted on the rest N-1 lines, dividing the fragment to be transmitted into a first fragment and a second fragment, and downloading the second fragment to the line which is completed with transmission for transmission;
and repeating the previous step until the transmission of the file to be transmitted is completed.
2. The multi-path based file transfer method as claimed in claim 1, wherein a transmission connection to the destination node is established on each line, wherein the transmission connection is a TCP protocol connection, and in case of transmission error on a certain line, delayed retries are continued using the line, the interval of retries increases exponentially, and the loop is restarted after reaching a certain threshold until transmission is resumed.
3. The multi-path based file transmission method as claimed in claim 1, wherein a transmission connection to the destination node is established on each line, wherein the transmission connection is a TCP protocol connection, and in case of transmission error on a line, the transmission of the segment to be transmitted on the remaining lines is completed and then the segment is downloaded for transmission.
4. The multi-path based file transmission method as claimed in claim 1, wherein a transmission connection is established on each line to the destination node, wherein the transmission connection is a UDP protocol connection, and upon receiving a UDP packet, the file data of the UDP packet is stored, so as to avoid discarding and retransmitting the buffered data due to packet loss to the maximum extent.
5. A multi-path-based file transmission method as claimed in claim 4, wherein the UDP protocol connection employs FEC algorithm, and avoids round trip time overhead and transmission speed influence caused by packet loss detection and retransmission through the transmission of redundant data.
6. A file transfer apparatus based on multipath, comprising:
the acquisition module is used for acquiring the number N of network lines between a target node and a current node and dividing a file to be transmitted into N fragments;
a connection establishing module, configured to establish a transmission connection to a target node in each line, where each transmission connection downloads a segment, and each segment is different from each other;
the transmission module is used for searching the line with the largest remaining fragment to be transmitted on the rest N-1 lines under the condition that the transmission of the file fragments on a certain line is finished, dividing the fragment to be transmitted into a first fragment and a second fragment, and downloading the second fragment to the line which is finished with the transmission for transmission; and repeating the previous step until the transmission of the file to be transmitted is completed.
7. A multi-path based file transfer device as claimed in claim 6, wherein the transmission link is a TCP protocol link, and in the event of a transmission error on a line, the line is used to continue delayed retries, the interval between retries increasing exponentially, and the loop is restarted until the transmission resumes after a certain threshold is reached.
8. The multi-path based file transmission apparatus as claimed in claim 6, wherein the transmission link is a UDP protocol link, and upon receiving a UDP packet, the file data of the UDP packet is stored, so as to avoid discarding and retransmitting the buffered data due to packet loss to the maximum extent.
9. A computer device, comprising:
a memory for storing a processing program;
a processor which, when executing the processing program, implements the multipath-based file transfer method of any one of claim 1 to claim 5.
10. A readable storage medium having a processing program stored thereon, the processing program, when executed by a processor, implementing the multipath-based file transmission method as recited in any one of claims 1 to 5.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211242067.7A CN115550246A (en) | 2022-10-11 | 2022-10-11 | File transmission method and device based on multiple paths |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202211242067.7A CN115550246A (en) | 2022-10-11 | 2022-10-11 | File transmission method and device based on multiple paths |
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| CN202211242067.7A Pending CN115550246A (en) | 2022-10-11 | 2022-10-11 | File transmission method and device based on multiple paths |
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