CN108512921A - File downloading method based on P2P network, electronic equipment and storage medium - Google Patents
File downloading method based on P2P network, electronic equipment and storage medium Download PDFInfo
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- CN108512921A CN108512921A CN201810265235.1A CN201810265235A CN108512921A CN 108512921 A CN108512921 A CN 108512921A CN 201810265235 A CN201810265235 A CN 201810265235A CN 108512921 A CN108512921 A CN 108512921A
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- 238000000034 method Methods 0.000 title abstract description 15
- 238000011068 loading method Methods 0.000 claims description 24
- 230000005540 biological transmission Effects 0.000 claims description 11
- 238000004590 computer program Methods 0.000 claims description 7
- 239000012634 fragment Substances 0.000 abstract description 10
- 238000012795 verification Methods 0.000 abstract description 4
- 238000013467 fragmentation Methods 0.000 description 6
- 238000006062 fragmentation reaction Methods 0.000 description 6
- 238000010586 diagram Methods 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 4
- 238000002679 ablation Methods 0.000 description 3
- 238000004891 communication Methods 0.000 description 2
- 241001269238 Data Species 0.000 description 1
- 101100217298 Mus musculus Aspm gene Proteins 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000012790 confirmation Methods 0.000 description 1
- 238000013524 data verification Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000012217 deletion Methods 0.000 description 1
- 230000037430 deletion Effects 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 238000004321 preservation Methods 0.000 description 1
- 238000004080 punching Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Classifications
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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]
-
- 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
- H04L67/10—Protocols in which an application is distributed across nodes in the network
- H04L67/104—Peer-to-peer [P2P] networks
- H04L67/1074—Peer-to-peer [P2P] networks for supporting data block transmission mechanisms
- H04L67/1078—Resource delivery mechanisms
- H04L67/108—Resource delivery mechanisms characterised by resources being split in blocks or fragments
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- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Information Retrieval, Db Structures And Fs Structures Therefor (AREA)
- Information Transfer Between Computers (AREA)
Abstract
The invention discloses a file downloading method, electronic equipment and a storage medium based on a P2P network, wherein the method comprises the steps of creating a scheduling window according to task information of a file to be downloaded; dividing the scheduling window into a plurality of segments; sending a data request of each segment; writing the received data into the corresponding segment; and if the N continuous segments on one side of the head of the scheduling window are all written with data, sliding the head of the scheduling window to the tail parts of the N segments, wherein N is a natural number meeting a sliding condition. The method comprises the steps of creating a scheduling window, downloading fragment data in the scheduling window first, sliding the scheduling window when a plurality of continuous fragments are written into data on one side of the head of the scheduling window, enabling the downloaded data to have better continuity, enabling a hard disk not to frequently turn around, jump forward and stop when the downloaded data are written into a disk, and being capable of reducing IO in the disk writing process, reducing fragments of downloaded files, enabling continuous blocks to be more and facilitating verification of file correctness.
Description
Technical field
The present invention relates to P2P file download technologies, more particularly to the document down loading method based on P2P networks, electronic equipment
And storage medium.
Background technology
P2P (Peer-to-peer) network, i.e. peer-to-peer network utilize distributed thought, and client saves in abundant calling system
The resource of point, the client node to be distributed in numerous different geographicals provide service, and each node is obtaining data as client computer
While, also service is provided for other nodes as server.With Information Security and enlargement, P2P networks are in data
Application is more and more extensive in terms of network backup and download.
The existing file download based on P2P networks is randomly assigned download path and asks usually using whole file as scheduling window
Seek data block.But since the transmission speed of different download paths in P2P networks is different, download the data block that node receives
It is not continuous, but it is discrete, random.To data preserve when can out of order write magnetic disk, therefore disk I/O it is higher and also under
The file fragmentation of load is more, is unfavorable for downloading the guarantee of file authentication.
Invention content
For overcome the deficiencies in the prior art, one of the objects of the present invention is to provide the file downloads based on P2P networks
Method, can solve existing P2P file downloads mode because of random schedule high IO situations, Yi Jiwen caused by out of order write magnetic disk
The more problem of part fragment.
The second object of the present invention is to provide electronic equipment, can solve existing P2P file downloads mode because random
Scheduling and high IO situations caused by out of order write magnetic disk and the more problem of file fragmentation.
The third object of the present invention is to provide storage medium, is stored with computer program, can solve existing P2P texts
Part downloading mode high IO situations caused by out of order write magnetic disk and the more problem of file fragmentation because of random schedule.
An object of the present invention is realized using following technical scheme：
Based on the document down loading method of P2P networks, include the following steps：
Scheduling window is created according to the mission bit stream of file to be downloaded；
The scheduling window is divided into multiple segments；
Send the request of data of each segment；
Corresponding segment is written into the data of reception；
If continuously data are written in N number of segment for scheduling window head side, by the head of the scheduling window
The tail portion of N number of segment is slid into, N is the natural number for meeting sliding condition.
Further, described that scheduling window is created according to the mission bit stream of file to be downloaded, specially：
The file to be downloaded is bigger, and the scheduling window of establishment is smaller.
Further, further comprising the steps of after the establishment scheduling window according to the mission bit stream of file to be downloaded：
The head of the scheduling window is aligned with the download initial position in the mission bit stream.
Further, the download initial position is specially：
It is described to download the file header that initial position is the file to be downloaded if the file to be downloaded is newly-built task
Position；
If the file to be downloaded is continuous downloading task, the download initial position is that the file to be downloaded is not downloaded
Partial initial position.
Further, the request of data for sending each segment, specially：
The request of data of each segment is sent to neighbor node.
Further, the data by reception are written after corresponding segment, further comprising the steps of：
Calculate the mass fraction for the neighbor node for sending the data.
Further, when sending the request of data of each segment again, preferentially to the higher neighbor node hair of mass fraction
Send the request of data of each segment.
Further, the mass fraction for calculating the neighbor node for sending the data, specifically includes following steps：
Obtain the mark for the neighbor node for sending the data；
Obtain the transmission delay of the data；
The mass fraction of the neighbor node is calculated according to the transmission delay.
Further, the N is the natural number for meeting sliding condition, specially：
Products of the N not less than the segment number and preset ratio of the scheduling window.
Further, if continuously data are written in N number of segment for scheduling window head side, by the tune
The head of degree window slides into the tail portion of N number of segment, and N is after meeting the natural number of sliding condition, further includes following step
Suddenly：
If after adjusting download end position of the tail portion of window in the mission bit stream after sliding, the tune is adjusted
Section window is so that the tail portion of the adjusting window after adjustment is aligned with the download end position.
The second object of the present invention is realized using following technical scheme：
Electronic equipment, including memory, processor and program stored in memory, described program be configured to by
The step of processor executes, and processor realizes above-mentioned document down loading method based on P2P networks when executing described program.
The third object of the present invention is realized using following technical scheme：
Storage medium, the media storage have computer program, are realized when the computer program is executed by processor
The step of stating the document down loading method based on P2P networks.
Compared with prior art, the beneficial effects of the present invention are：Scheduling window is created by being directed to downloading task, then first
Fragment data in download schedule window, and incited somebody to action when there are continuous several segment written data in scheduling window head side
Scheduling window slides immediately, therefore downloading data has better continuity, and hard disk will not when disk is written in downloading data
Frequent u-turn, preshoot, emergency stop, and the IO of disk ablation process can be reduced, the file fragmentation of download is less, and continuous blocks are more
It is more, convenient for the correctness of verification file.
Description of the drawings
Fig. 1 is the flow diagram of the document down loading method based on P2P networks of the embodiment of the present invention one；
Fig. 2 is the schematic diagram that scheduling window is slided in Fig. 1；
Fig. 3 is the partial enlarged view of a-quadrant in Fig. 2；
Fig. 4 is the flow diagram of the document down loading method based on P2P networks of the embodiment of the present invention two；
Fig. 5 is the structural schematic diagram of the electronic equipment of the embodiment of the present invention three.
Specific implementation mode
In the following, in conjunction with attached drawing and specific implementation mode, the present invention is described further, it should be noted that not
Under the premise of conflicting, new implementation can be formed between various embodiments described below or between each technical characteristic in any combination
Example.
Embodiment one
If Fig. 1 is the document down loading method based on P2P networks, include the following steps：
Step S110, scheduling window is created according to the mission bit stream of file to be downloaded.
File to be downloaded can be the file that other nodes provide in P2P networks, can also be this node standby in P2P nets
File on network on other nodes.The mission bit stream of file to be downloaded may include the file name of file to be downloaded, file
Size can also include the address of Tracker servers, be used for the segment check code SHA1 of verification of data integrity and correctness
Deng.
In another embodiment, Tracker servers are not needed in P2P networks, existing distributed hash can be passed through
Table (Distributed Hash Table, DHT) technology realizes the addressing of file in DHT networks.
Step S120, the scheduling window is divided into multiple segments.
Such as the length of scheduling window is 50MB, then the scheduling window can be divided into the piece that multiple sizes are 256KB
Section.It is easily transmitted in order to more efficient, further each segment can also be divided into equal in magnitude, the smaller sub-pieces of length
Section, such as the size of each sub-piece can be 16KB.Different segments or sub-piece can be different into P2P networks section
Point request.
Step S130, the request of data of each segment is sent.
As preferred embodiment, step S130 sends the request of data of each segment, specially：Node is downloaded to neighbours
Node sends the request of data of each segment.
In embodiments of the present invention, the strategy for downloading node selection neighbor node is possessed from it by Tracker servers
Node listing in be randomly chosen a certain number of nodes and return to the download node as node to be selected, then by the download
Node is randomly chosen several nodes from node to be selected and is used as its neighbor node again.
After downloading the list that node obtains neighbor node by Tracker servers, node and each neighbor node are downloaded
Between can be carried out communication, this just realizes P2P structures truly.Communications protocol between node is to be based on
Transmission Control Protocol.After successfully connection being established between two nodes, it is also necessary to confirmation of shaking hands is carried out with other side, after confirming successfully
Message can be transmitted between node.
As preferred embodiment, downloading node can be at random to asking different segments at multiple nodes.It can fit
The uncertainty for answering P2P nodes, to maximize the speed of download of data in scheduling window.
The request algorithm of segment or sub-pieces segment data has the performance of file download critically important influence.Download node root
The data of which segment of override requests or sub-piece are determined according to the request algorithm of fragment data.
As preferred embodiment, the sub-piece that node once requests some segment is downloaded, then the segment is remaining
Sub-piece is just preferential requested and downloads, in this way, a complete segment can be obtained as early as possible.
Further, when being loaded in the next segment of request under, neighbor node can preferentially be selected to possess that minimum piece
Section, it is ensured that rapid dispersion of the minimum segment in P2P networks avoids causing some because of the failure of certain several node
Fragment deletion.
As preferred embodiment, it is possible to the very slow neighbor node request of a uploading rate due to downloading node
One segment, to cause the delay downloaded；Therefore in order to prevent this situation, most of segment in the scheduling window or
Sub-piece is downloaded preservation, and the data for only having remained a small amount of segment or sub-piece are not received by, then downloading node can be to
All neighbor nodes ask the segment or the data of sub-piece.Once the data receiver of the segment or sub-piece is completed, just send out
The information for cancelling request of data is sent, in order to avoid cause the waste of bandwidth.
Step S140, corresponding segment is written into the data of reception.
As preferred embodiment, the data of each segment are downloaded to be verified after the completion, can utilize cryptographic Hash
Corresponding segment just is written in the data of reception after being proved to be successful.To ensure the correctness of downloading data.
If step S150, continuously data are written in N number of segment for scheduling window head side, by the scheduling window
The head of mouth slides into the tail portion of N number of segment, and N is the natural number for meeting sliding condition.
As shown in Figures 2 and 3, which is divided into 50 segments, and the head 100 of the scheduling window continuously has
20 segments have been written into data, and there are no data write-ins for the 21-23 segment, and scheduling window can be slided backward to 20 pieces
The position of section, makes the head of the scheduling window be aligned with the tail portion 200 of the 20th segment.Therefore it is had more again on rear side of scheduling window
Position can repeat step S120- steps S150.But the position that will be had more on rear side of scheduling window is only needed to be divided into 20 at this time
Segment；And the 1-3 segment etc. that data are written not yet had both been contained in the scheduling window after the sliding, also include
The 4-8 segment etc. of data is written, therefore only needs to send the request of data of each segment of write-in data not yet.
As preferred embodiment, the N in step S150 is the natural number for meeting sliding condition, specially：N is not less than
The segment number of the scheduling window and the product of preset ratio.
Such as preset ratio is 0.1, the segment number of scheduling window is 50, then when scheduling window head side has no less than
5 segment written data, with regard to carrying out a slide.
Document down loading method provided in an embodiment of the present invention based on P2P networks creates scheduling window by being directed to downloading task
Mouthful, the then fragment data in first download schedule window, and thering are continuous several segments to write when scheduling window head side
Scheduling window is slided immediately when entering data, therefore downloading data has better continuity, file to be downloaded is video counts
According to or when audio data, side may be implemented download to compile to play；Hard disk will not be reversed end for end frequently when disk is written in downloading data, preceding
Punching, emergency stop, and the IO of disk ablation process can be reduced, the file fragmentation of download is less, and continuous blocks are more, convenient for verification text
The correctness of part.
Embodiment two
Document down loading method based on P2P networks as shown in Figure 4, includes the following steps：
Step S210, scheduling window is created according to the mission bit stream of file to be downloaded.
As preferred embodiment, the scheduling window of different length can be created according to the size of file to be downloaded.
Due in downloading process, it may appear that certain data in scheduling window such as some either multiple bytes or
It is always wrong that the content of several M can not download or download in time data back.And the file download mode based on P2P networks
In, each data are the peer node request downloads into network respectively, therefore as preferred embodiment, file to be downloaded
It is bigger, so that it may smaller to create scheduling window.The data of the scheduling window kind are less at this time, therefore same data can be to
More peer node requests, each data are by probability higher that is timely, correctly downloading.It thereby may be ensured that the number in scheduling window
According to completion can be downloaded faster, download and write operation of the later stage for non-downloading data or download wrong data are reduced, because
And it further reduced the swing of magnetic disc head.
Step S220, the head of the scheduling window is aligned with the download initial position in the mission bit stream.
As preferred embodiment, the download initial position is specially：
It is described to download the file header that initial position is the file to be downloaded if the file to be downloaded is newly-built task
Position.If the file to be downloaded is continuous downloading task, the download initial position is that the file to be downloaded does not download portion
The initial position divided.
Some downloading tasks are newly-built, and the data of download can be written by the storage location of system distribution, at this time
Download the file header position that initial position is the file to be downloaded.Some downloading tasks after downloading a part of data due to
The operations such as family shutdown can suspend, then start to continue to download remainder, and this downloading task is continuous downloading task, is downloaded at this time
Initial position is the initial position of the non-download part of the file to be downloaded.Therefore the file of newly-built task can both may be implemented
It downloads, can also realize the file download of continuous downloading task.
Step S230, the scheduling window is divided into multiple segments.
Step S240, the request of data of each segment is sent.
Step S250, corresponding segment is written into the data of reception.
As being further improved for the embodiment of the present invention, after corresponding segment is written in the data of reception by step S250,
It is further comprising the steps of：
Step S201, the mass fraction for the neighbor node for sending the data is calculated.
As preferred embodiment, step S201 calculates the mass fraction for the neighbor node for sending the data, specifically
Include the following steps：
Step S2011, the mark for the neighbor node for sending the data is obtained.
The mark for the neighbor node for sending each data can be got by downloading when node receives data from neighbor node, to
It can count from certain neighbor node has downloaded how many data, the network matter downloaded between node and the neighbor node can also be counted
Measure parameter.
Step S2012, the transmission delay of the data is obtained.Transmission delay can be used for evaluating neighbor node and the download
The quality communicated between node.
Step S2013, the mass fraction of the neighbor node is calculated according to the transmission delay.Transmission delay is longer, then
The mass fraction of respective neighbor node is lower.
It is preferentially higher to mass fraction when sending the request of data of each segment again as preferred embodiment
Neighbor node sends the request of data of each segment.It i.e. can be faster from certain neighbor node downloading data, just if downloading node
More data are asked to the neighbor node, so as to further promote data speed of download.
If step S260, continuously data are written in N number of segment for scheduling window head side, by the scheduling window
The head of mouth slides into the tail portion of N number of segment, and N is the natural number for meeting sliding condition.
Step S210, S230, S240, S250 and S260 distinguish S110, S120, S130, S140 in corresponding embodiment one
And S150, it repeats no more.
As preferred embodiment, if continuously N number of segment is written for the scheduling window heads step S260 side
The head of the scheduling window, then are slid into the tail portion of N number of segment by data, N be meet sliding condition natural number it
Afterwards, further comprising the steps of：
If after adjusting download end position of the tail portion of window in the mission bit stream after step S270, sliding,
The adjusting window is adjusted so that the tail portion of the adjusting window after adjustment is aligned with the download end position.When file will under
When carrying completion, the end mark of file to be downloaded may be crossed after adjusting window sliding, that is, downloads end position；It therefore can be with
Adjustment adjusts the length of window so that the tail portion for adjusting window is aligned with the download end position, adjusting window after adjustment
All fragment datas in mouthful download completion, and then band download file download finishes.
As seen through the above description of the embodiments, those skilled in the art can be understood that the present invention can
It is realized by the mode of software plus required general hardware platform.Based on this understanding, technical scheme of the present invention essence
On in other words the part that contributes to existing technology can be expressed in the form of software products, the computer software product
It can be stored in a storage medium, such as ROM/RAM, magnetic disc, CD, including some instructions are used so that a computer equipment
(can be personal computer, server either network equipment etc.) executes the certain of each embodiment of the present invention or embodiment
Method described in part, such as：
Storage medium, the storage medium are stored with computer program, real when the computer program is executed by processor
The step of existing aforementioned document down loading method based on P2P networks.
The present invention can be used in numerous general or special purpose computing system environments or configuration.Such as：Personal computer, service
Device computer, handheld device or portable device, laptop device, multicomputer system, microprocessor-based system, machine top
Box, programmable consumer-elcetronics devices, network PC, minicomputer, mainframe computer including any of the above system or equipment
Distributed computing environment etc., such as embodiment three.
Embodiment three
Electronic equipment as shown in Figure 5, including memory 300, processor 400 and the program being stored in memory 300,
Described program is configured to be executed by processor 400, and processor 400 is realized above-mentioned based on P2P networks when executing described program
The step of document down loading method.
The method in electronic equipment and previous embodiment in the present embodiment is based on two sides under same inventive concept
Face is in front described in detail method implementation process, so those skilled in the art can be clear according to foregoing description
Understand to Chu the structure and implementation process of the system in this implementation, in order to illustrate the succinct of book, details are not described herein again.
Electronic equipment provided in an embodiment of the present invention, can by be directed to downloading task create scheduling window, then first under
The fragment data in scheduling window is carried, and will adjusted when scheduling window head side there are continuous several segment written data
Degree window slides immediately, therefore downloading data has better continuity, and file to be downloaded is video data or audio data
When, side may be implemented and download volume broadcasting；Hard disk will not be reversed end for end frequently when disk is written in downloading data, preshoot, emergency stop, and
The IO of disk ablation process can be reduced, the file fragmentation of download is less, and continuous blocks are more, convenient for the correctness of verification file.
The above embodiment is only the preferred embodiment of the present invention, and the scope of protection of the present invention is not limited thereto,
The variation and replacement for any unsubstantiality that those skilled in the art is done on the basis of the present invention belong to institute of the present invention
Claimed range.
Claims (12)
1. the document down loading method based on P2P networks, which is characterized in that include the following steps：
Scheduling window is created according to the mission bit stream of file to be downloaded；
The scheduling window is divided into multiple segments；
Send the request of data of each segment；
Corresponding segment is written into the data of reception；
If continuously data are written in N number of segment for scheduling window head side, the head of the scheduling window is slided
To the tail portion of N number of segment, N is the natural number for meeting sliding condition.
2. the document down loading method as described in claim 1 based on P2P networks, it is characterised in that：It is described according to text to be downloaded
The mission bit stream of part creates scheduling window, specially：
The file to be downloaded is bigger, and the scheduling window of establishment is smaller.
3. the document down loading method as described in claim 1 based on P2P networks, it is characterised in that：It is described according to text to be downloaded
It is further comprising the steps of after the mission bit stream of part creates scheduling window：
The head of the scheduling window is aligned with the download initial position in the mission bit stream.
4. the document down loading method as claimed in claim 3 based on P2P networks, it is characterised in that：The download initial position
Specially：
It is described to download the file header position that initial position is the file to be downloaded if the file to be downloaded is newly-built task
It sets；
If the file to be downloaded is continuous downloading task, the download initial position is the non-download part of the file to be downloaded
Initial position.
5. the document down loading method as described in claim 1 based on P2P networks, it is characterised in that：Each segment of transmission
Request of data, specially：
The request of data of each segment is sent to neighbor node.
6. the document down loading method as claimed in claim 5 based on P2P networks, it is characterised in that：The data by reception
It is written after corresponding segment, it is further comprising the steps of：
Calculate the mass fraction for the neighbor node for sending the data.
7. the document down loading method as claimed in claim 6 based on P2P networks, it is characterised in that：When sending each segment again
Request of data when, the request of data of each segment is preferentially sent to the higher neighbor node of mass fraction.
8. the document down loading method as claimed in claim 6 based on P2P networks, it is characterised in that：Described in the calculating is sent
The mass fraction of the neighbor node of data, specifically includes following steps：
Obtain the mark for the neighbor node for sending the data；
Obtain the transmission delay of the data；
The mass fraction of the neighbor node is calculated according to the transmission delay.
9. the document down loading method based on P2P networks as described in any one of claim 1-8, it is characterised in that：The N is
Meet the natural number of sliding condition, specially：
Products of the N not less than the segment number and preset ratio of the scheduling window.
10. the document down loading method based on P2P networks as described in any one of claim 1-8, it is characterised in that：If described
Continuously data are written in N number of segment for scheduling window head side, then the head of the scheduling window are slid into the N
The tail portion of a segment, N are after meeting the natural number of sliding condition, further comprising the steps of：
If after adjusting download end position of the tail portion of window in the mission bit stream after sliding, the adjusting window is adjusted
Mouth is so that the tail portion of the adjusting window after adjustment is aligned with the download end position.
11. electronic equipment, it is characterised in that：Including memory, processor and program stored in memory, described program
Be configured to be executed by processor, processor execute described program when realize as described in any one of claim 1-10 based on
The step of document down loading method of P2P networks.
12. storage medium, the storage medium is stored with computer program, it is characterised in that：The computer program is handled
The step of document down loading method based on P2P networks as described in any one of claim 1-10 is realized when device executes.
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| CN201810265235.1A CN108512921A (en) | 2018-03-28 | 2018-03-28 | File downloading method based on P2P network, electronic equipment and storage medium |
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| CN201810265235.1A CN108512921A (en) | 2018-03-28 | 2018-03-28 | File downloading method based on P2P network, electronic equipment and storage medium |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109995876A (en) * | 2019-04-11 | 2019-07-09 | 深圳市永兴元科技股份有限公司 | Document transmission method, device, system and computer storage medium |
| CN110048906A (en) * | 2019-03-27 | 2019-07-23 | 网宿科技股份有限公司 | A kind of method, system, device and server judging node-node transmission quality |
| CN110099134A (en) * | 2018-09-26 | 2019-08-06 | 深圳市网心科技有限公司 | Video file method for down loading, device, electronic equipment and storage medium |
| US10917497B2 (en) | 2019-03-27 | 2021-02-09 | Wangsu Science & Technology Co., Ltd. | Method, system, device and server for determining transmission quality of node |
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