CN106603719B - Method for wireless downloading of remote file - Google Patents

Method for wireless downloading of remote file Download PDF

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CN106603719B
CN106603719B CN201710001860.0A CN201710001860A CN106603719B CN 106603719 B CN106603719 B CN 106603719B CN 201710001860 A CN201710001860 A CN 201710001860A CN 106603719 B CN106603719 B CN 106603719B
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data
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CN106603719A (en
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罗显光
黄众
彭冬良
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Hunan Zhirong Technology Co ltd
CRRC Zhuzhou Locomotive Co Ltd
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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
    • H04L67/50—Network services
    • H04L67/60—Scheduling or organising the servicing of application requests, e.g. requests for application data transmissions using the analysis and optimisation of the required network resources

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Abstract

The invention discloses a method for wireless downloading of remote files, which comprises the steps that when a BO needs to acquire a fault data file and a WTD finds that the fault data file exists, the WTD sequentially sends the fault data file to the BO according to the data volume of preset bytes; when the BO receives data of a fault data file with preset bytes, marking the data according to the initial bytes of the data to record whether the data are correctly received; when all data of the fault data file are sent, the BO sends a mark packet comprising all marks corresponding to the fault data file to the WTD; and the WTD judges whether all the fault data files are correctly received according to the marker packet, and retransmits the lost part of the fault data file when part of the fault data file is lost. On one hand, the invention reduces the bandwidth and the memory occupation of the BO end server, and on the other hand, reduces the file sending time.

Description

Method for wireless downloading of remote file
Technical Field
The invention relates to the technical field of remote file downloading of trains, in particular to a method for wirelessly downloading a remote file.
Background
The event recorder is used for collecting various information generated in the running process of the train and storing the information as an event record file. When a train breaks down and a BO (Back Office) needs to acquire a fault data file for data analysis, a WTD (vehicle-mounted wireless transmission device) generally packs the fault data file and sends the fault data file to a ground operation center in the prior art, and when the sending of the fault data file fails due to reasons such as unreliable network, the WTD packs the fault data file again and sends the fault data file once again, so that on one hand, bandwidth and a server memory of a BO end are occupied, and on the other hand, time is wasted.
Therefore, how to provide a method for wireless downloading of remote files to solve the above technical problems is a problem that needs to be solved by those skilled in the art.
Disclosure of Invention
The invention aims to provide a method for downloading remote files wirelessly, which reduces the bandwidth and the memory occupation of a BO end server on one hand and reduces the file sending time on the other hand.
In order to solve the technical problem, the invention provides a method for wireless downloading of remote files, which comprises the following steps:
when the BO needs to acquire a fault data file and the WTD finds that the fault data file exists, the WTD sequentially sends the fault data file to the BO according to the data volume of preset bytes;
when the BO receives the data of the fault data file with the preset bytes, marking the data according to the initial bytes of the data so as to record whether the data are correctly received;
when all data of the fault data file are sent, the BO sends a mark packet comprising all marks corresponding to the fault data file to the WTD;
and the WTD judges whether all the fault data files are correctly received according to the marker packet, and retransmits the lost part of the fault data files when part of the fault data files are lost.
Preferably, when the BO needs to obtain the fault data file and the WTD finds that the fault data file exists, the process of sequentially sending the fault data file to the BO by the WTD according to the data size of the preset bytes specifically includes:
establishing connection between the WTD and the BO;
BO sends a remote file wireless downloading instruction to WTD;
and the WTD receives the remote file wireless downloading instruction, then inquires whether a fault data file exists in a specific directory, and if so, sequentially sends the fault data file to the BO according to the data volume of preset bytes.
Preferably, the process of sequentially sending the fault data files to the BO according to the data size of the preset bytes specifically includes:
for all the files in the fault data file, the following operations are sequentially carried out:
the WTD fills the information of the file into an initial message and sends the initial message to a BO;
the BO sends a file identification message to the WTD after receiving the initial message, wherein the file identification message comprises the UID and the initial byte of the file;
and the WTD sequentially sends the files to the BO according to the data volume of preset bytes.
Preferably, before the WTD sequentially sends the files to the BO according to the data size of the preset bytes, the method further includes:
and after receiving the file identification message, the WTD sends a file confirmation message to the BO, wherein the file confirmation message comprises the confirmed UID and the starting byte.
Preferably, the file identification message further includes a maximum load;
then correspondingly:
the file confirmation message also comprises a confirmed maximum load;
the method further comprises the following steps:
the WTD divides the fault data file into a plurality of file blocks according to the maximum load and sequentially sends the file blocks;
when all data of the fault data file are sent, the process that the BO sends the mark packet including all marks corresponding to the fault data file to the WTD is as follows:
when all data of a file block is sent, the BO sends a mark packet including all marks corresponding to the file block to the WTD.
Preferably, the method further comprises:
after finishing sending a file block, the WTD calculates the proportion of the number of the data which finishes marking to the number of all the data of the file block according to the marking packet, and changes the sending rate when sending the next file block according to the proportion.
Preferably, the process of changing the sending rate when sending the next file block according to the ratio specifically includes:
when the ratio is 1, the WTD increases the rate to send the next file block;
when the proportion is larger than a preset threshold and smaller than 1, the WTD keeps the speed to send the next file block;
and when the proportion is smaller than a preset threshold value, the WTD reduces the speed rate to send the next file block.
Preferably, the preset threshold is 80%.
Preferably, the tag packet includes a payload, a number of completion tags, and a completion tag number.
Preferably, when the data of the fault data file of the preset byte is correctly received, the corresponding number in the completion flag number is 1, and when the data of the fault data file of the preset byte is not correctly received, the corresponding number in the completion flag number is 0.
The invention provides a method for wireless downloading of remote files, which comprises the steps that when a BO needs to acquire a fault data file and a WTD finds that the fault data file exists, the WTD sequentially sends the fault data file to the BO according to the data volume of preset bytes; when the BO receives data of a fault data file with preset bytes, marking the data according to the initial bytes of the data to record whether the data are correctly received; when all data of the fault data file are sent, the BO sends a mark packet comprising all marks corresponding to the fault data file to the WTD; and the WTD judges whether all the fault data files are correctly received according to the marker packet, and retransmits the lost part of the fault data file when part of the fault data file is lost.
Therefore, when the invention transmits the fault data file, the BO can mark the receiving condition of the transmitted fault data file so as to facilitate the WTD to search whether the lost data exists, and when part of the fault data file is lost, the BO only retransmits the lost part of the fault data file, so that on one hand, the bandwidth and the memory occupation of the BO end server are reduced, and on the other hand, the file transmission time is reduced.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed in the prior art and the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
Fig. 1 is a flowchart illustrating a process of a method for wireless downloading of a remote file according to the present invention.
Detailed Description
The core of the invention is to provide a method for wireless downloading of remote files, which reduces the bandwidth and the memory occupation of a BO end server on one hand, and reduces the file sending time on the other hand.
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1, fig. 1 is a flowchart illustrating a process of a method for wirelessly downloading a remote file according to the present invention, the method including:
step S11: when the BO needs to acquire the fault data file and the WTD finds that the fault data file exists, the WTD sequentially sends the fault data file to the BO according to the data volume of preset bytes;
specifically, when the train has a fault, the event recorder records a fault data file, when the BO needs to acquire the fault data file, the WTD searches whether an unsent fault data file exists in a specific directory, and if so, sends the fault data file to the BO according to the data amount of preset bytes.
Specifically, the preset byte may be 1KB, and of course, other values are also possible, and the present invention is not particularly limited herein, depending on the actual situation.
Step S12: when the BO receives data of a fault data file with preset bytes, marking the data according to the initial bytes of the data to record whether the data are correctly received;
specifically, the above predetermined byte is 1KB as an example:
when the BO receives data of a 1KB fault data file, marking according to the initial byte of the data for recording whether the data is correctly received, when the 1KB fault data file is lost, the data is not marked at the beginning, until all data in the fault data file are completely sent, the WTD supplementarily sends a frame of control message to indicate that all data in the fault data file are completely sent, except for the corresponding marking of all correctly received data in the completion mark number which is completed by the BO, the rest unmarked data means that the data is lost.
Step S13: when all data of the fault data file are sent, the BO sends a mark packet comprising all marks corresponding to the fault data file to the WTD;
preferably, the tag packet includes a payload, a number of completion tags, and a completion tag number.
Step S14: and the WTD judges whether all the fault data files are correctly received according to the marker packet, and retransmits the lost part of the fault data file when part of the fault data file is lost.
Preferably, when the BO needs to obtain the fault data file and the WTD finds that the fault data file exists, the process of sequentially sending the fault data file to the BO by the WTD according to the data size of the preset bytes is specifically:
establishing connection between the WTD and the BO;
BO sends a remote file wireless downloading instruction to WTD;
and the WTD receives a remote file wireless downloading instruction and then inquires whether a fault data file exists in a specific directory, and if so, the fault data file is sequentially sent to the BO according to the data volume of preset bytes.
Specifically, the WTD sends a connection request including train information such as a train number and an IP address of the train to the BO, and the BO responds to the connection request of the WTD and establishes a connection while recording the train information.
After the connection is established, the BO can automatically or receive an instruction triggered manually by a user to send a remote file wireless downloading instruction to the WTD, the WTD queries whether a fault data file exists in a specific directory after receiving the remote file wireless downloading instruction, and if the fault data file exists, the fault data file is sequentially sent to the BO according to the data volume of preset bytes.
Preferably, the process of sequentially sending the fault data files to the BO according to the data size of the preset bytes specifically includes:
for all the files in the fault data file, the following operations are performed in sequence:
the WTD fills information of the file into an initial message and sends the initial message to a BO;
the BO sends a file identification message to the WTD after receiving the initial message, wherein the file identification message comprises the UID and the initial byte of the file;
the WTD sequentially sends the files to the BO according to the data size of preset bytes.
After receiving the initial message, the BO knows that the WTD has a file to transmit, and assigns a UID (unique identifier). In particular, the UID is used here to uniquely mark the file, and this identifier will always be used in the data transmission of this file.
In addition, after the WTD finds out the fault data files, the fault data files are added to a file list to be sent, and the process is repeated for all the files in the fault data files.
Preferably, before the WTD sequentially sends the file to the BO in the preset byte data size, the method further includes:
and after receiving the file identification message, the WTD sends a file confirmation message to the BO, wherein the file confirmation message comprises the confirmed UID and the starting byte.
In order to improve the reliability of data transmission, after receiving the file identification message, the WTD sends a file confirmation message to the BO, wherein the file confirmation message comprises a confirmed UID and an initial byte.
Theoretically, the confirmed UID and confirmed start byte should be the same as the UID and start byte of the file included in the file identification message, respectively, and if not, the WTD will not send the fault data file to the BO.
Preferably, the file identification message further includes a maximum load;
then correspondingly:
the file confirmation message also comprises the confirmed maximum load;
the method further comprises the following steps:
the WTD divides the fault data file into a plurality of file blocks according to the maximum load and sequentially sends the file blocks;
when all data of the fault data file are sent, the process that the BO sends the mark packet including all marks corresponding to the fault data file to the WTD is as follows:
when all data transmission of a file block is completed, the BO transmits a tag packet including all tags corresponding to the file block to the WTD.
Specifically, because the BO side may perform data transmission with multiple WTDs at the same time, the configuration and performance of the server are limited, and a maximum load is set for each file to be transmitted, where the maximum load indicates how many preset bytes of data are continuously transmitted, and then the two sides suspend transmission to confirm the value of the number of received messages. The setting of the value of the maximum load is related to the configuration of the server.
Assuming that the fault data file is 128KB and the maximum load is 50KB, the WTD may divide the fault data file into 50KB, 50KB and 28 KB.
The size of the file block is: payload x preset bytes.
The payload here refers to the number of times that the content in the current failure data file needs to be sent in the file message format, and the value is less than or equal to the maximum load value specified by BO (less than the corresponding failure data file sent last by the normal WTD, for example, 28KB as mentioned above).
In addition, after the data of one file block is completely transmitted, whether all the data are transmitted correctly is judged, and if all the data are transmitted correctly, the next file block is transmitted. Otherwise, the lost data is sent again.
Specifically, for the format of the initial packet, please refer to table 1:
TABLE 1 initial message Table
Figure BDA0001201781570000071
After receiving the initial message, the BO sends a file identification message to the WTD, where the format of the file identification message is as shown in table 2:
TABLE 2 File IDENTIFICATION REPORT TABLE
Figure BDA0001201781570000072
After receiving the file identification message, the WTD sends a file confirmation message to the BO, specifically, the format of the file confirmation message is as shown in table 3:
table 3 document confirmation statement
Message numbering Message length Message version UID Start byte Maximum load validation
2Bytes 2Bytes 1Byte 2Bytes 5Bytes 2Bytes
The BO sends a tag package including all tags corresponding to the file blocks to the WTD, where the tag package is in the format:
table 4 packet table
Figure BDA0001201781570000081
The completion flag data refers to the number of data that the BO has correctly received, and the completion flag number records flags corresponding to all preset bytes of data in the faulty data file or file block.
The WTD starts to pack the fault data block data corresponding to the incomplete mark into a file message according to the initial byte and the incomplete mark, and sends the file message according to the following file message format, wherein the file message format is that 1KB data volume (preset byte number and in a file content field) is sent each time:
TABLE 5 File message Table
Message numbering Message length Message version UID Start byte Payload Document content
2Bytes 2Bytes 1Byte 2Bytes 5Bytes 2Bytes 1024Bytes
And after the WTD completes all the file messages of the fault data corresponding to the incomplete marks, the WTD supplementarily sends a frame of control message to indicate that the file block transmission is completed.
TABLE 6 control message table
Message numbering Message length Message version UID Code
2Bytes 2Bytes 1Byte 2Bytes 1Byte
And after receiving the data, the BO sends a mark packet with a completion mark to the WTD, wherein the completion mark number indicates the state of receiving the message by the ground server, and if the effective load bit values of the number are all 1, the data are all received correctly, the transmission of the next file block is carried out until all the file blocks are transmitted completely. Otherwise, the WTD retransmits the fault data file corresponding to 0 in the effective load bit before the mark field of the mark packet.
Preferably, the method further comprises:
after finishing sending a file block, the WTD calculates the proportion of the number of the data which finishes marking to the number of all the data of the file block according to the marking packet, and changes the sending rate when sending the next file block according to the proportion.
It can be understood that if the ratio is 1, it indicates that all data are marked, that is, all data are correctly received, that the channel is relatively unobstructed at this time, and at this time, the rate may be increased to transmit the next file block, otherwise, it indicates that the channel is not unobstructed at this time, and at this time, the transmission of the next file block may be maintained or reduced.
Preferably, the process of changing the sending rate when sending the next file block according to the proportion specifically includes:
when the ratio is 1, the WTD increases the rate to send the next file block;
when the proportion is larger than a preset threshold and smaller than 1, the WTD keeps the speed to send the next file block;
and when the proportion is smaller than a preset threshold value, the WTD reduces the speed rate to send the next file block.
Preferably, the preset threshold is 80%.
Of course, the preset threshold may be other values, and the present invention is not limited in particular herein, and is determined according to the actual situation.
Preferably, when the data of the fault data file of the preset byte is correctly received, the corresponding number in the completion flag number is 1, and when the data of the fault data file of the preset byte is not correctly received, the corresponding number in the completion flag number is 0.
The method provided by the invention is described below by taking the maximum load as an example and taking 100 as an example:
and after receiving the file identification message of the BO, the WTD sends a file confirmation message to the BO, confirms the UID and the maximum load and sends the initial byte 0 to the BO.
The BO feeds back a tag packet, which sends the UID number of the file and confirms that the file block start byte is 0, the maximum load is 100, the number of completion tags is 0, and the completion tag number is 100 0 (since the file has not yet been transferred at this time).
After receiving the initial marking packet, the WTD sends the file message by starting from the initial byte of the file block and contrasting the initial byte corresponding to the completion marking bit of 0 in the received marking packet.
After the file messages of 100 preset bytes are transmitted, the WTD sends control messages to the BO (a code column in the control messages defines a code to indicate that the file block transmission is completed).
The BO sends a tag packet with a completion tag number to the WTD, wherein the completion tag number is the number of received file messages in a payload (taking 100 as an example) (if 100, all the sent file messages are received, if the number is less than 100 (such as 80), 20 file messages are lost in the transmission process, the lost file positions can see the completion tag number (100 sequences of 0 and 1, 1 indicates received, and 0 indicates not received). The WTD resends 20 file messages which are not received again aiming at the file data with the completion tag bit of 0 in the tag packet, and sends a control message to indicate that the transmission of the current file block is completed, and the WTD and the BO repeat the steps until the BO feeds back the completion tag number to be 100, and each 1 bit in the completion tag is 1.
In conclusion, the invention confirms that the train reliably transmits the data file to the ground operation center server in the mobile communication through a defined complete set of remote file wireless downloading transmission protocol.
The invention provides a method for wireless downloading of remote files, which comprises the steps that when a BO needs to acquire a fault data file and a WTD finds that the fault data file exists, the WTD sequentially sends the fault data file to the BO according to the data volume of preset bytes; when the BO receives data of a fault data file with preset bytes, marking the data according to the initial bytes of the data to record whether the data are correctly received; when all data of the fault data file are sent, the BO sends a mark packet comprising all marks corresponding to the fault data file to the WTD; and the WTD judges whether all the fault data files are correctly received according to the marker packet, and retransmits the lost part of the fault data file when part of the fault data file is lost.
Therefore, when the invention transmits the fault data file, the BO can mark the receiving condition of the transmitted fault data file so as to facilitate the WTD to search whether the lost data exists, and when part of the fault data file is lost, the BO only retransmits the lost part of the fault data file, so that on one hand, the bandwidth and the memory occupation of the BO end server are reduced, and on the other hand, the file transmission time is reduced.
It should be noted that, in the present specification, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims (8)

1. A method for wireless downloading of remote files, comprising:
when the ground operation center BO needs to acquire a fault data file and the vehicle-mounted wireless transmission equipment WTD finds that the fault data file exists, the WTD sequentially sends the fault data file to the BO according to the data volume of preset bytes;
when the BO receives the data of the fault data file with the preset bytes, marking the data according to the initial bytes of the data so as to record whether the data are correctly received;
when all data of the fault data file are sent, the BO sends a mark packet comprising all marks corresponding to the fault data file to the WTD;
the WTD judges whether all the fault data files are correctly received according to the marker packet, and retransmits the lost part of the fault data files when part of the fault data files are lost;
the process of sequentially sending the fault data file to the BO by the WTD according to the data size of the preset bytes specifically includes:
the WTD divides the fault data into a plurality of file blocks according to the maximum load, and sequentially sends the file blocks to a BO, wherein the size of each file block is the product of an effective load and a preset byte, and the value of the effective load is smaller than or equal to the value of the maximum load;
the process of the BO sending the marker packet including all the markers corresponding to the fault data file to the WTD specifically includes:
when all data of a file block are sent, the BO sends a mark packet comprising all marks corresponding to the file block to the WTD;
the method further comprises the following steps:
after finishing sending a file block, the WTD calculates the proportion of the number of the data which finishes marking to the number of all the data of the file block according to the marking packet, and changes the sending rate when sending the next file block according to the proportion.
2. The method for wirelessly downloading the remote file according to claim 1, wherein when the BO is to obtain the fault data file and the WTD finds that the fault data file exists, the process of sequentially sending the fault data file to the BO by the WTD according to the data size of the preset bytes specifically comprises:
establishing connection between the WTD and the BO;
BO sends a remote file wireless downloading instruction to WTD;
and the WTD receives the remote file wireless downloading instruction, then inquires whether a fault data file exists in a specific directory, and if so, sequentially sends the fault data file to the BO according to the data volume of preset bytes.
3. The method for wirelessly downloading the remote file according to claim 2, wherein the process of sequentially sending the failure data file to the BO according to the data size of the preset bytes is specifically as follows:
for all the files in the fault data file, the following operations are sequentially carried out:
the WTD fills the information of the file into an initial message and sends the initial message to a BO;
the BO sends a file identification message to the WTD after receiving the initial message, wherein the file identification message comprises the UID and the initial byte of the file;
and the WTD sequentially sends the files to the BO according to the data volume of preset bytes.
4. The method for remote wireless download of files according to claim 3, wherein before the WTD sends the file to BO in order of a preset amount of bytes, the method further comprises:
and after receiving the file identification message, the WTD sends a file confirmation message to the BO, wherein the file confirmation message comprises the confirmed UID and the starting byte.
5. The method for wireless downloading of a remote file according to claim 4, wherein the process of changing the transmission rate when transmitting the next file block according to the ratio specifically comprises:
when the ratio is 1, the WTD increases the rate to send the next file block;
when the proportion is larger than a preset threshold and smaller than 1, the WTD keeps the speed to send the next file block;
and when the proportion is smaller than a preset threshold value, the WTD reduces the speed rate to send the next file block.
6. The method for remote wireless download of files according to claim 5, wherein the predetermined threshold is 80%.
7. The method for remote wireless download of files according to any of the claims 1-6, wherein the tag package comprises a payload, a number of completion tags and a completion tag number.
8. The method for remote file wireless download according to claim 7, wherein when the data of the predetermined byte of the failed data file is correctly received, the corresponding number in the completion flag number is 1, and when the data of the predetermined byte of the failed data file is not correctly received, the corresponding number in the completion flag number is 0.
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