CN115085864A - Data transmission method and device - Google Patents

Data transmission method and device Download PDF

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Publication number
CN115085864A
CN115085864A CN202210458980.4A CN202210458980A CN115085864A CN 115085864 A CN115085864 A CN 115085864A CN 202210458980 A CN202210458980 A CN 202210458980A CN 115085864 A CN115085864 A CN 115085864A
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data
missing
sending
sent
transmission
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CN115085864B (en
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张箐
陶鹏飞
王萌
程军
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Aerospace Information Research Institute of CAS
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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
    • H04L1/0078—Avoidance of errors by organising the transmitted data in a format specifically designed to deal with errors, e.g. location
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L69/00—Network arrangements, protocols or services independent of the application payload and not provided for in the other groups of this subclass
    • H04L69/16—Implementation or adaptation of Internet protocol [IP], of transmission control protocol [TCP] or of user datagram protocol [UDP]
    • H04L69/163—In-band adaptation of TCP data exchange; In-band control procedures
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L69/00—Network arrangements, protocols or services independent of the application payload and not provided for in the other groups of this subclass
    • H04L69/16—Implementation or adaptation of Internet protocol [IP], of transmission control protocol [TCP] or of user datagram protocol [UDP]
    • H04L69/164—Adaptation or special uses of UDP protocol

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Computer Security & Cryptography (AREA)
  • Data Exchanges In Wide-Area Networks (AREA)
  • Communication Control (AREA)

Abstract

The invention provides a data transmission method and a device, wherein the data transmission method comprises the following steps: sequentially sending the data of each data group in M data groups corresponding to data to be sent to a data receiving party, receiving a missing data serial number identifier fed back by the data receiving party aiming at each data group, and sending the missing data corresponding to the missing data serial number identifier to the data receiving party; and under the condition that all the data of the M data groups are sent to the data receiving side, sending the missing data corresponding to each missing data serial number identification to the data receiving side. By the method, the data to be transmitted are transmitted in a centralized manner in a data group mode, and the missing data corresponding to each data missing sequence number identifier is transmitted to the data receiver, so that the data transmission efficiency is improved.

Description

Data transmission method and device
Technical Field
The present invention relates to the field of computer technologies, and in particular, to a data transmission method and apparatus.
Background
With the development of computer technology, network communication technology based on computer technology is widely applied all over the world. Various receiving stations and communication stations are deployed in various regions of the world, so that data transmission also develops towards the trend of long distance and cross-region.
In the related art, data transmission needs to use a transmission control protocol, which ensures effective transmission of data by using a stable and reliable transmission mechanism.
However, the transmission control protocol is born in the initial development stage of the network, the stability of the network communication link is poor in the period, and the transmission control protocol is provided with a frequent receiving response mechanism for ensuring the reliable transmission of data. In the process of present remote and ultra-remote data transmission, the network communication time delay is high, and the data transmission by using the transmission control protocol not only increases the transmission time, but also occupies the network bandwidth, thereby greatly reducing the data transmission efficiency. Therefore, how to improve the data transmission efficiency is a problem to be solved urgently.
Disclosure of Invention
To solve the problems in the prior art, embodiments of the present invention provide a data transmission method and apparatus.
The invention provides a data transmission method, which is applied to a data sender and comprises the following steps:
sequentially sending the data of each data packet in M data packets corresponding to the data to be sent to a data receiving party, receiving a missing data serial number identifier fed back by the data receiving party aiming at each data packet, and sending the missing data corresponding to the missing data serial number identifier to the data receiving party; m is a positive integer;
and under the condition that all the data of the M data packets are sent to the data receiving side, sending the missing data corresponding to each missing data serial number identification to the data receiving side.
Optionally, before the sequentially sending the data of each of the M data packets corresponding to the data to be sent to the data receiver, the method includes:
acquiring time delay information;
and grouping the data to be transmitted based on the time delay information.
Optionally, the sequentially sending the data of each of the M data packets corresponding to the data to be sent to the data receiving side includes:
and based on a User Datagram Protocol (UDP), sequentially sending the data of each data packet in the M data packets corresponding to the data to be sent to a data receiver.
Optionally, the sequentially sending the data of each of the M data packets corresponding to the data to be sent to the data receiving side includes:
acquiring network bandwidth information and the time delay information, and determining data transmission gap duration according to the network bandwidth information and the time delay information;
and based on the data sending interval duration, sequentially sending the data of each data packet in the M data packets corresponding to the data to be sent to a data receiver.
Optionally, the missing data sequence number identifier is fed back to the data sender by the data receiver when a preset condition is met.
Optionally, after the sending of the missing data corresponding to each missing data sequence number identifier to the data receiving side, the method includes:
sending a data packet transmission completion instruction to the data receiving party, wherein the data packet transmission completion instruction is used for the data receiving party to judge whether the data packet transmission is finished;
and when the data packet is not sent completely, the step of sending the missing data corresponding to each missing data serial number identifier to the data receiving side is executed.
Optionally, the sending a data packet transmission completion instruction to the data receiving side includes:
and sending the data packet transmission completion instruction to the data receiving party based on a Transmission Control Protocol (TCP).
The present invention also provides a data transmission apparatus, comprising:
the first sending module is used for sending the data of each data packet in M data packets corresponding to the data to be sent to a data receiving party in sequence, receiving the missing data serial number identification fed back by the data receiving party aiming at each data packet, and sending the missing data corresponding to the missing data serial number identification to the data receiving party; m is a positive integer;
and a second sending module, configured to send, to the data receiving side, the missing data corresponding to each missing data sequence identifier when all the data in the M data packets are sent to the data receiving side.
The invention also provides an electronic device, which comprises a memory, a processor and a computer program stored on the memory and capable of running on the processor, wherein the processor executes the program to realize the data transmission method.
The invention also provides a non-transitory computer-readable storage medium having stored thereon a computer program which, when executed by a processor, implements a data transmission method as described in any of the above.
The invention also provides a computer program product comprising a computer program which, when executed by a processor, implements a data transmission method as described in any one of the above.
The data transmission method provided by the invention carries out data transmission on the data to be transmitted in a data packet mode in a centralized mode, and sends the missing data corresponding to the missing data serial number identification to the data receiving party according to the missing data serial number identification fed back by the data receiving party. And under the condition that all the data of the M data packets are sent to the data receiving party, the missing data corresponding to the serial number identification of each missing data is sent to the data receiving party in a centralized manner, so that the data transmission efficiency is improved.
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In order to more clearly illustrate the technical solutions of the present invention or the prior art, the drawings needed for the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and those skilled in the art can also obtain other drawings according to the drawings without creative efforts.
FIG. 1 is a flow chart of a data transmission method provided by the present invention;
FIG. 2 is a process diagram of a data transmission method provided by the present invention;
FIG. 3 is a schematic diagram of a data transmission device according to the present invention;
fig. 4 is a schematic structural diagram of an electronic device provided in the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings, 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.
First, the noun terms to which one or more embodiments of the present invention relate are explained.
Transmission Control Protocol (TCP): the transmission control protocol is a communication protocol of Wide Area Network (WAN) with wide application, and aims to provide a reliable communication mode between two communication endpoints when communication is carried out across multiple networks.
User Datagram Protocol (UDP): the user datagram protocol is a connectionless protocol in that the source and terminal do not establish a connection before transmitting data, and when it wants to transmit it, it simply grabs the data from the application and throws it on the network as soon as possible. At the sending end, the speed of the user datagram protocol for transmitting data is only limited by the speed of the application program for generating data, the capability of a computer and the transmission bandwidth; at the receiving end, the user datagram protocol places each message segment in a queue, from which the application reads one message segment at a time.
With the development of computer technology, network communication technology based on computer technology is widely applied all over the world. Various receiving stations and communication stations are deployed in various regions of the world, so that data transmission also develops towards the trend of long distance and cross-region.
In the related art, data transmission needs to use a transmission control protocol, which ensures effective transmission of data by using a stable and reliable transmission mechanism.
However, the transmission control protocol is born in the initial development stage of the network, the stability of the network communication link is poor in the period, and the transmission control protocol is provided with a frequent receiving response mechanism for ensuring the reliable transmission of data. In the process of present remote and ultra-remote data transmission, the network communication time delay is high, and the data transmission by using the transmission control protocol not only increases the transmission time, but also occupies the network bandwidth, thereby greatly reducing the data transmission efficiency.
Based on the above problems, in order to improve the data transmission efficiency, especially the data transmission efficiency in a high latency environment, the present invention provides a Feedback Retransmission User data packet Protocol (UDP), which performs data transmission based on a TCP Protocol and a UDP Protocol, thereby effectively improving the data transmission efficiency.
In particular, the invention provides a data transmission method, and one or more embodiments of the invention relate to a data transmission apparatus, an electronic device, a non-transitory computer-readable storage medium, and a computer program product at the same time.
The data transmission method provided by the present invention is described in detail below with reference to fig. 1-2.
Referring to fig. 1, fig. 1 is a schematic flow chart of a data transmission method provided by the present invention, which specifically includes steps 101 to 102.
Step 101, sequentially sending data of each data packet in M data packets corresponding to data to be sent to a data receiving party, receiving a missing data serial number identifier fed back by the data receiving party for each data packet, and sending missing data corresponding to the missing data serial number identifier to the data receiving party; m is a positive integer.
The execution main body of the invention can be any electronic equipment with a data transmission function, and similarly, the data receiving party can also be any electronic equipment with a data transmission function, for example, any one of a smart phone, a smart watch, a desktop computer, a portable computer and the like.
In this embodiment, the step of sequentially sending the data of each of the M data packets corresponding to the data to be sent to the data receiving side means that the data sending side needs to send the data of each data packet to the data receiving side according to the sequence of the sequence number identifiers corresponding to the M data packets and the sequence of the sequence number identifiers corresponding to the data in each data packet.
Correspondingly, the data receiver needs to sequentially feed back the serial number identifier of the missing data of each data packet to the data transmitter, where the missing data is data that the data receiver has not received, and the serial number identifier of the missing data is a serial number identifier corresponding to the data that the data receiver has not received.
Specifically, when data transmission is performed, a retransmission statistics linked list L1 and a feedback statistics list L need to be defined at the data sender first i 1; defining a retransmission statistical chain list L2 and a feedback statistical list L at a data receiving side i 2。
The retransmission statistics linked list L1 is used for the data sender to send data to the data receiver, that is, the data sender can use the retransmission statistics linked list L1 to send the data of each data packet in the M data packets corresponding to the data to be sent to the data receiver in sequence;
feedback statistics list L i 1 is used for the data sender to receive the missing data sequence number identification of the feedback of the data receiver aiming at each data packet.
The retransmission statistics linked list L2 is used for the data receiving side to feed back the missing data sequence number identifier for each data packet to the data sending side, that is, the data receiving side can utilize the feedback statistics queue L2 to feed back the missing data sequence number identifier of each data packet to the data sending side.
Feedback statistics linked list L i 2 for receiving data from data receiver and sending by data senderData, i.e. data receivers, can utilize the feedback statistical linked list L i And 2, receiving the data of each data packet in the M data packets sent by the data sender in sequence.
Specifically, each data group package of the M data group packages corresponding to the data to be sent and the data in each data group package correspond to a unique serial number identifier, the data in each data group package and the data in each data group package are arranged according to the serial number identifier sequence, and the data sender and the data receiver can determine the specific data of each data group package of the M data group packages according to the serial number identifier.
After acquiring the data to be transmitted, the data transmitting party may sequentially transmit the data in each of the M data packets corresponding to the data to be transmitted to the data receiving party according to the serial number identifier by using the retransmission statistical linked list L1 according to the internet protocol address (i.e., IP address) and the corresponding port of the data receiving party. For example, data 1-100 is in data set 1; data 101-200 in the data package 2; then the retransmission statistics linked list L1 is used to sequentially send the data 1-100 in the data packet 1 to the data receiving side according to the sequence number identification, and then sequentially send the data 101-200 in the data packet 2 to the data receiving side according to the sequence number identification.
Data receiver using feedback statistical chain table L i 2 after receiving the data of each data packet in sequence, analyzing the header of the data packet, identifying the unique serial number identifier corresponding to each data in the data packet, writing the missing data serial number identifier into the retransmission statistical linked list L2 according to the data serial number identifier, and feeding back the retransmission statistical linked list L2 to the data sender. And after receiving the missing data sequence number identification fed back by the data receiver, the data sender sends the missing data corresponding to the missing data sequence number identification to the data receiver.
For example, the data receiver is using the feedback statistical linked list L i 2 after receiving the data of the data package 1, analyzing the header of the data package, identifying the unique serial number identification corresponding to 1-500 data in the data package 1, and identifying the serial number identification of the missing data according to the serial number identificationIs 450-500; the data receiving side writes the missing data sequence number identifications 450 and 500 into the retransmission statistical linked list L2 and feeds back the retransmission statistical linked list L2 to the data sending side. After receiving the missing data sequence number identifier fed back by the data receiving side, the data sending side sends the missing data corresponding to the missing data sequence number identifier 450 and 500 in the data packet 1 to the data receiving side.
The data receiving party feeds the missing data serial number identification back to the data sending party, so that the data sending party can send the missing data corresponding to the missing data serial number identification to the data receiving party according to the missing data serial number identification, and the integrity of the data during data transmission is ensured.
And 102, under the condition that all the data of the M data packets are sent to the data receiving side, sending the missing data corresponding to each missing data serial number identification to the data receiving side.
In this embodiment, when receiving each data packet in sequence, the data receiving side feeds back the serial number identifier of the missing data for each data packet to the data sending side.
When the data sender sends all the data of the M data packets to the data receiver, the data receiver needs to feed back the serial number identifier corresponding to each missing data to the data sender, where each missing data is all the data that the data receiver misses after the data sender sends all the data of the M data packets to the data receiver.
The data sender can send the missing data corresponding to the missing data serial number identifications to the data receiver according to the serial number identifications corresponding to the missing data, and therefore integrity of the data during data transmission is guaranteed.
The data transmission method provided by the invention carries out data transmission on the data to be sent in a data packet mode in a centralized way, and sends the missing data corresponding to the missing data serial number identification to the data receiving party according to the missing data serial number identification fed back by the data receiving party. And under the condition that all the data of the M data packets are sent to the data receiving party, the missing data corresponding to the serial number identification of each missing data is sent to the data receiving party in a centralized manner, so that the data transmission efficiency is improved.
It should be noted that before sequentially sending the data of each of the M data packets corresponding to the data to be sent to the data receiver, the data to be sent also needs to be grouped, and the grouping of the data to be sent can be specifically realized by the following method:
acquiring time delay information;
and grouping the data to be transmitted based on the time delay information.
In this embodiment, the delay information refers to the time required for data to be transmitted from one end of the network to the other end, that is, the time required for data to be transmitted from the data sender to the data receiver. Wherein the delay information comprises at least one of:
a) the transmission delay (also called transmission delay) is the time required by the data sender to send a data frame, i.e. the time required from the first bit of the data frame to the last bit of the data frame;
b) propagation delay, which is the time that an electromagnetic wave needs to spend in a certain distance in a channel;
c) the processing delay refers to the time for processing the data to be sent when the data sender receives the data to be sent, for example, the time required for grouping the data to be sent, analyzing the header of the grouping, extracting the data part from the grouping, and the like;
d) the queuing delay refers to the time required for queuing and waiting for processing in a queue when the data to be transmitted is transmitted through the network.
In this embodiment, the sending delay, the propagation delay, the processing delay, and the queuing delay may be added to obtain the delay information required for transmitting the data to be sent from the data sender to the data receiver. And then grouping the data to be transmitted based on the time delay information.
In practical application, a delay threshold value can be preset, and when the delay information reaches the preset delay threshold value, the data volume of the data to be transmitted is too large, so that the data to be transmitted is grouped, and then the grouped information to be transmitted is sent to a data receiver.
In a possible implementation manner of the embodiment of the present invention, the data to be transmitted is grouped, specifically, the data to be transmitted is packetized and grouped. After the data to be transmitted are divided into packets and groups, the large data file to be transmitted can be divided into a plurality of small data files for transmission, so that the data transmission efficiency is improved.
Specifically, grouping the data to be transmitted includes the following steps:
firstly, the data to be transmitted needs to be subjected to subpackage processing, which can be specifically obtained by calculation according to formula (1):
Figure BDA0003619827990000091
in the above formula (1), D represents the number of bytes of data to be transmitted; p represents the size of the byte number of each preset data packet; and N is the total packet number. It should be noted that in the above formula (1), the number of sub-packets N is "one-in-one", so that the last data packet usually has a number of bytes not equal to p, and the last data packet needs to be separately subjected to a receive write operation.
Secondly, after the to-be-transmitted data is subjected to the subpackage processing, the to-be-transmitted data after the subpackage processing needs to be subjected to the grouping processing, and the grouping processing can be specifically obtained by calculating according to a formula (2):
Figure BDA0003619827990000101
in the formula (2), g represents the number of data in each preset data packet; g represents the total number of packets after grouping.
In the above embodiment, by acquiring the delay information and then grouping the data to be transmitted based on the delay information, the large data file to be transmitted can be divided into a plurality of small data files for transmission, thereby improving the efficiency of data transmission.
In this embodiment, the data sending side sends the data of each data packet in the M data packets corresponding to the data to be sent to the data receiving side in sequence according to the serial number identifier by using the retransmission statistics linked list L1, which may specifically be implemented in the following manner:
firstly, a retransmission statistics linked list L and a feedback statistics queue L of a data sending side and a data receiving side need to be firstly transmitted i The initialization setting is specifically obtained by equations (3) to (4):
L A ＝A+1 (3)
L iA →0 (4)
in the above formulas (3) and (4), L A Representing the initialization of a retransmission statistical linked list; a represents the serial number identification number corresponding to the head of the data of any data packet; l is iA And the initialization of the feedback statistical queue is shown, and the character numerical values in the feedback statistical queue are all reset to 0 after the initialization.
Secondly, a retransmission statistics linked list L and a feedback statistics queue L i After the initialization setting is performed, by using the initialized retransmission statistics linked list L1, the data of each data packet in the M data packet corresponding to the data to be sent is sent to the data receiving party according to the serial number identifier in sequence, which can be specifically obtained by formula (5):
Figure BDA0003619827990000102
in the above formula (5), G n The data sender sends all data of the data packet group n; n represents the number of groups to which the data packet to be transmitted belongs; g represents the number of data in each preset data packet; l1 denotes a retransmission statistics linked list containing missing data sequence numbers identifying the corresponding missing data. It should be noted that when n is 1, it indicates that the data sender sends the first packet, and the data sender does not send the missing data to the data receiver.
In practical application, the data of each of the M data groups corresponding to the data to be transmitted needs to be sequentially transmitted to the data receiver based on a user datagram protocol UDP.
In this embodiment, a User Datagram Protocol (UDP) is a connectionless Protocol, that is, a connection is not established between a data transmitting side and a data receiving side before data is transmitted, and when data transmission is performed by using the UDP Protocol, only data to be transmitted needs to be simply captured and directly transmitted to the data receiving side. On the data sender side, the speed of UDP data transmission is limited only by the speed of generation of the data to be transmitted, the computer power and the transmission bandwidth.
When data transmission is carried out, particularly under the environment with high network communication delay, the UDP protocol can be used for realizing the rapid transmission of the data. Therefore, based on the UDP protocol, the data of each data group in the M data groups corresponding to the data to be transmitted is sequentially transmitted to the data receiving party, and the data transmission efficiency can be effectively improved.
In a possible implementation manner of the embodiment of the present invention, in addition to sequentially sending data of each of M data packets corresponding to data to be sent to a data receiving side based on a user datagram protocol UDP, it is further required that:
acquiring network bandwidth information and time delay information, and determining data transmission gap duration according to the network bandwidth information and the time delay information;
and based on the data sending interval duration, sequentially sending the data of each data packet in the M data packets corresponding to the data to be sent to a data receiver.
In this embodiment, in the data transmission process, data transmission needs to be performed by using the transmission link network, but generally, the performance of the transmission link network is limited, and in practical application, the data transmission efficiency of the data packet is inversely proportional to the transmission efficiency of missing data under a certain condition, that is, the higher the data transmission efficiency of the data packet is, the greater the data transmission efficiency is, and the bandwidth utilization rate of the transmission link is decreased.
Therefore, before data transmission, the time length of the data sending gap needs to be set according to the network bandwidth information and the time delay information, so that the data transmission can be prevented from exceeding the bearing ranges of a transmission link network and a data receiver, and the data transmission efficiency can be improved.
Specifically, in this embodiment, the data transmission gap duration may be divided into two parts, one is the transmission gap duration between two adjacent data in the same data packet, and the other is the transmission gap duration between two adjacent data packets. The duration of the two parts of data sending gaps can be debugged based on the time delay information and the network bandwidth information, namely, the duration of the data sending gaps is debugged by adjusting the network bandwidth information and the time delay information, so that the optimal value of the duration of the data sending gaps is determined, the data sending and sending efficiency is controlled by adjusting the data sending gap time, the situation that the duration of the data sending gaps exceeds the bearing range of a transmission link network and a data receiving party can be avoided during data transmission, and the data transmission efficiency can be improved.
In this embodiment, the network bandwidth information refers to the amount of data transmitted per unit time in the transmission link network, and the larger the network bandwidth is, the more the amount of data transmitted per unit time in the transmission link network is.
The delay information refers to the time required for data to be transmitted from one end of the network to the other end, that is, the time required for data to be transmitted from a data transmitting side to a data receiving side.
Specifically, the data transmission gap duration can be debugged by formula (6):
T＝(g-1)×td (6)
in the above equation (6), T represents the time taken to transmit a data packet; g represents the number of data in each preset data packet; td denotes a data transmission gap duration.
In this embodiment, the data transmission gap duration is debugged through the network bandwidth information and the time delay information, and when the time consumed for transmitting the data packet is the minimum, the optimal value of the data transmission gap duration is determined.
After the optimal value of the data sending interval duration is determined, the data of each data packet in the M data packets corresponding to the data to be sent is sent to the data receiving party in sequence based on the data sending interval duration.
In a possible implementation manner of the embodiment of the present invention, after sequentially sending the data of each of the M data groups corresponding to the data to be sent to the data receiving side, the data receiving side may recognize a unique serial number identifier corresponding to each data in each data group, write the missing data serial number identifier into the retransmission statistics linked list L2 according to the data serial number identifier, and then feed back the retransmission statistics linked list L2 including the missing data serial number identifier to the data sending side, where the missing data serial number identifier is fed back to the data sending side by the data receiving side when a preset condition is met.
Specifically, the preset condition is that the data receiving side feeds back the serial number identifier of the missing data to the data sending side, and the preset condition may be that the number of the serial number identifiers corresponding to the data received by the data receiving side reaches a number threshold, and/or that the data receiving gap duration of the data receiving side reaches a time threshold, where the data receiving gap duration refers to a time difference between two adjacent data in the same data packet. And under the condition of meeting the preset conditions, the data receiving party stops receiving the data and feeds back the serial number identification of the missing data to the data sending party.
In practical application, the preset condition may be that the serial number identifier corresponding to the data received by the data receiving side reaches a number threshold.
For example, if the number threshold is 95, when the data receiver receives 100 data in the data packet 1 sent by the data sender, the serial number identifier of the data is identified, and when it is identified that the serial number identifier of the data in the received data packet 1 reaches 95, the timeout mechanism is triggered (for example, the preset timeout duration in the timeout mechanism is 1 second), and when the preset timeout duration reaches 1 second, the data reception is convenient for counting the data reception situation of the data packet 1 at present. If the serial number identification number corresponding to the currently received data is 1-96, writing the data with the serial number identification number of 97-100 in the data group package 1 as missing data into a retransmission statistical linked list L2, and then feeding back a retransmission statistical linked list L2 containing the serial number identification of the missing data to a data sender;
it should be noted that, if the data receiving side receives the last data (i.e. the data with the sequence number of 100) in the data group package 1 within 1 second of the preset timeout duration, the data receiving side directly counts the data receiving condition of the data group package 1 at present, writes the missing data in the data group package 1 into the retransmission statistics linked list L2, and then feeds back the retransmission statistics linked list L2 including the sequence number of the missing data to the data sending side.
The preset condition may also be that the data receiving gap duration of the data receiving party reaches a time threshold.
For example, when the data receiving side receives 100 data with sequence number identification number of 101-.
Specifically, the time threshold may be calculated by the following equation (7):
Th n ＝(A n -ε)&&(η×RTT) (7)
in the above formula (7), Th n The time threshold value of missing data serial number identification is fed back to the data sending party; n represents the number of data packet packets received by the data receiver; a represents the serial number identification number corresponding to the head of the data of any data packet; epsilon represents a data identification value decrement factor; η represents the gap time increment factor; RTT represents the round trip delay of data transmission and reception.
It should be noted that, a specific process of receiving data of each of the M data packets by the data receiving side can be expressed by the following formula (8):
Figure BDA0003619827990000141
in the above formula (8), H n Indicating that the data receiving party receives all the data of the data packet group n; n represents the number of groups to which the received data packet belongs; g represents the number of data in each preset data packet; th n And the time threshold value represents the time threshold value of the missing data sequence number identification fed back by the data sending party from the data receiving party.
In the above embodiment, when the data receiving side meets the preset condition, the data transmitting side feeds back the serial number identifier of the missing data to the data transmitting side, and then the data transmitting side transmits the missing data corresponding to the serial number identifier of the missing data to the data receiving side according to the serial number identifier of the missing data fed back by the data receiving side.
In a possible implementation manner of the embodiment of the present invention, the data of each of the M data packets corresponding to the data to be sent is sequentially sent to the data receiving side, and meanwhile, the missing data sequence number identifier fed back by the data receiving side for each data packet is received, and then the missing data corresponding to the missing data sequence number identifier is sent to the data receiving side.
And stopping sending the data to the data receiver until all M data packets corresponding to the data to be sent are sent to the data receiver.
Specifically, the specific process of receiving all data packets by the data receiving side can be expressed by the following formula (9):
H N ＝N||Th G (9)
in the above formula (9), H N The data receiver receives the data of all the data packets; n represents the total packet number; g represents the group number of the last data packet in the M data packets; th G Data indicating that the data receiving side has received all the data packets and countsAnd feeding back the time threshold value of the missing data sequence number identification of the last group of data packet by the data sending party.
It should be noted that, because the number of data in the data packet G is not certain, the threshold for triggering the data receiving side to feed back the missing data sequence number identifier needs to be set as the total packet number N, and the time threshold needs to be set in order to prevent the waiting response time from being too long due to the missing data. That is, when the received data sequence number identifier number a is equal to N, or when the received data sequence number identifier number a reaches a preset condition (that is, the sequence number identifier number corresponding to the data received by the data receiving side reaches the number threshold, and the data receiving gap duration of the data receiving side reaches the time threshold), it indicates that the data sending side has finished sending all the data packets in the data to be sent.
In a possible implementation manner of the embodiment of the present invention, after the missing data corresponding to each missing data sequence number identifier is sent to the data receiving side, it is further required to determine whether the data receiving side receives all the data, so as to ensure the integrity of the data in the data transmission process. Whether the data receiver receives all the data can be confirmed specifically by the following modes:
sending a data packet transmission completion instruction to a data receiving party, wherein the data packet transmission completion instruction is used for the data receiving party to judge whether the data packet transmission is completed or not;
when the data packet is not sent, executing the step of sending the missing data corresponding to each missing data sequence number identification to a data receiving side;
when the data packet transmission is finished, the data receiving side receives all the data transmitted by the data transmitting side, and at this time, the data receiving side transmits a data packet transmission finishing instruction to the data transmitting side, that is, the data packet transmission finishing instruction is shown.
In this embodiment, the data receiving side determining whether the data packet is sent completely means that the data receiving side determines whether missing data still exists according to the corresponding data serial number identifier in the received data packet, and if the data receiving side still has the missing data, it indicates that the data packet is not sent completely, that is, the data receiving side does not receive all the data sent by the data sending side. The data sending party continues to execute the step of sending the missing data corresponding to each missing data sequence number identification to the data receiving party.
When the data packet transmission completion instruction is sent to the data receiving side, the data receiving side still circularly receives the missing data corresponding to each missing data sequence number identifier. Therefore, after sending the data packet transmission completion instruction to the data receiving party, the data receiving party needs to judge the feedback statistical linked list L i 2 if there is still missing data sequence number identification.
In feedback statistical linked list L i 2, no missing data sequence number identification exists, i.e. the feedback statistical linked list L i 2, when the missing data sequence number identification number is 0, it indicates that the data receiving side has received all the data sent by the data sending side. At this time, the data receiving side sends a data packet transmission end instruction to the data sending side, that is, the data packet transmission end instruction indicates that the data packet transmission is ended.
In feedback statistical linked list L i 2, if there is a missing data sequence number identifier, it indicates that the data packet has not been sent, i.e. the data receiver does not receive all the data sent by the data sender. The data receiver will feed back the statistical linked list L i 2, writing the serial number identifier of each missing data in the retransmission statistics linked list L2, and feeding back the retransmission statistics linked list L2 to the data sender. Correspondingly, the data sending party continues to execute the step of sending the missing data corresponding to each missing data serial number identifier to the data receiving party until receiving a data packet transmission ending instruction sent by the data receiving party to indicate that the data packet transmission is ended.
In the above embodiment, a data packet transmission end instruction is sent to the data receiving side, so that the data receiving side determines whether there is a missing data sequence number identifier; and under the condition that the missing data serial number identification exists, executing the step of sending the missing data corresponding to each missing data serial number identification to the data receiving party, thereby ensuring the integrity of the data received by the data receiving party.
In this embodiment, it is necessary to send a data packet transmission completion instruction to the data receiving side based on the transmission control protocol TCP.
In particular, Transmission Control Protocol (TCP) is a communication Protocol oriented to a wide area network, and aims to provide a reliable communication mode between two communication endpoints.
The TCP protocol has a stable and reliable transmission mechanism to ensure effective transmission of data, and the TCP protocol establishes reliable connection through three-way handshake first and then establishes a reliable communication channel between two communication endpoints.
In this embodiment, based on the user datagram protocol UDP, any one of the M data groups corresponding to the data to be transmitted is transmitted to the data receiving side. However, UDP is an unreliable transmission, that is, the UDP protocol cannot know whether the data sent to the data receiver is completely received, and cannot verify the integrity of the received data.
Therefore, a data packet transmission completion instruction needs to be sent to the data receiving side based on the TCP protocol, so as to ensure the integrity of data received by the data receiving side.
The data transmission method provided by the invention carries out data transmission on the data to be transmitted in a data packet mode in a centralized mode, and sends the missing data corresponding to the missing data serial number identification to the data receiving party according to the missing data serial number identification fed back by the data receiving party. And under the condition that all the data of the M data packets are sent to the data receiving party, the missing data corresponding to the serial number identification of each missing data is sent to the data receiving party in a centralized manner, so that the data transmission efficiency is improved.
The data transmission method will be further described with reference to fig. 2 by taking the application of the data transmission method in data transmission as an example. Referring to fig. 2, fig. 2 is a schematic processing procedure diagram of the data transmission method provided by the present invention.
In this embodiment, the data sender is a client, and the data receiver is a server. And data transmission is realized between the client and the server. The method specifically comprises the following steps, wherein the steps 201 to 208 are called a centralized feedback sending stage; steps 209 to 212 are referred to as the loop feedback retransmission phase:
in step 201, the client (i.e. the data sender mentioned above) sequentially and collectively sends the data of each data packet (starting from data packet 1) in the M data packets corresponding to the data to be sent to the server (i.e. the data receiver mentioned above).
Step 202, the server receives the data of the first data packet sent by the client, and writes the serial number identifier of the missing data into the retransmission statistics linked list. And when the server meets the preset conditions, feeding back the missing data sequence number identification in the retransmission statistical linked list to the client.
And 203, after receiving the missing data serial number identifier in the retransmission statistics linked list fed back by the server, the client sends the missing data corresponding to the missing data serial number identifier to the server.
Step 201 to step 203 are executed in a loop until all the data of the M data packets are sent to the server, and it should be noted that all the data of the M data packets are sent to the server, which can be represented by step 204 to step 206:
in step 204, the client sends the data of the last data packet (e.g. data packet N) of the M data packets corresponding to the data to be sent to the server in sequence.
Step 205, the server receives the data of the data packet package N and writes the serial number identifier of the missing data into the retransmission statistical linked list; and when the server meets the preset condition, feeding back the serial number identification of the missing data in the retransmission statistical linked list to the client.
And step 206, after receiving the missing data serial number identifier in the retransmission statistics linked list fed back by the server, the client sends the missing data corresponding to the missing data serial number identifier to the client.
And step 207, when the client sends all the data of the M data packets to the server, the client sends the missing data corresponding to each missing data serial number identifier to the server.
In step 208, the client sends a data packet transmission completion instruction to the server.
At this point, the centralized transmission feedback phase execution ends. And the server receives the missing data corresponding to each missing data sequence number identification sent by the client, and judges whether the missing data sequence number identification still exists or not based on the data packet transmission completion instruction.
And under the condition that the missing data sequence number identification exists, the cycle feedback retransmission phase starts to be executed. I.e. step 209-step 212 are performed to perform the cyclic retransmission operation.
Step 209, the server writes the updated serial number identifier of each missing data into the retransmission statistical linked list, and feeds back the updated serial number identifier of each missing data in the retransmission statistical linked list to the client; the updated missing data serial number identifications are data serial number identifications corresponding to data which are still missing after the server receives the missing data corresponding to the missing data serial number identifications.
In step 210, the client sends the updated missing data corresponding to each missing data sequence number identifier to the server.
In step 211, the client sends a data packet transmission completion instruction to the server.
The server receives the missing data corresponding to each updated missing data serial number identifier sent by the client, and judges whether the missing data serial number identifier still exists or not based on a data packet transmission completion instruction; in case there is no missing data sequence number identification, step 212 is performed, i.e. it indicates the end of the data transmission.
Step 212, the server sends a data packet transmission end instruction to the client.
The data transmission method provided by the invention carries out data transmission on the data to be transmitted in a data packet mode in a centralized mode, and sends the missing data corresponding to the missing data serial number identification to the data receiving party according to the missing data serial number identification fed back by the data receiving party. And under the condition that all the data of the M data packets are sent to the data receiving party, the missing data corresponding to the serial number identification of each missing data is sent to the data receiving party in a centralized manner, so that the data transmission efficiency is improved.
The data transmission device provided by the present invention is described below, and the data transmission device described below and the data transmission method described above may be referred to correspondingly.
Referring to fig. 3, fig. 3 is a schematic structural diagram of a data transmission device provided in the present invention.
The first sending module 301 is configured to send data of each of the M data packets corresponding to the data to be sent to a data receiving side in sequence, receive a missing data sequence number identifier fed back by the data receiving side for each data packet, and send missing data corresponding to the missing data sequence number identifier to the data receiving side; m is a positive integer;
a second sending module 302, configured to send, to the data receiving side, the missing data corresponding to each missing data sequence identifier when all the data in the M data packets are sent to the data receiving side.
Optionally, the first sending module 301 is further configured to:
acquiring time delay information;
and grouping the data to be transmitted based on the time delay information.
Optionally, the first sending module 301 is further configured to:
and based on a User Datagram Protocol (UDP), sequentially sending the data of each data group in the M data groups corresponding to the data to be sent to a data receiver.
Optionally, the first sending module 301 is further configured to:
acquiring network bandwidth information and time delay information, and determining data sending gap duration according to the network bandwidth information and the time delay information;
and based on the data sending interval duration, sequentially sending the data of each data packet in the M data packets corresponding to the data to be sent to a data receiver.
Optionally, the missing data sequence number identifier is fed back to the data sending party by the data receiving party when a preset condition is met.
Optionally, the second sending module 302 is further configured to:
sending a data packet transmission completion instruction to a data receiving party, wherein the data packet transmission completion instruction is used for the data receiving party to judge whether the data packet transmission is completed or not;
and when the data packet is not transmitted, executing a step of transmitting the missing data corresponding to each missing data sequence number identification to the data receiving side.
Optionally, the second sending module 302 is further configured to:
and sending a data packet transmission completion instruction to a data receiving party based on a Transmission Control Protocol (TCP).
The data transmission device provided by the invention performs data transmission on the data to be transmitted in a data group mode, and transmits the missing data corresponding to the missing data serial number identification to the data receiving party according to the missing data serial number identification fed back by the data receiving party. And under the condition that all the data of the M data groups are sent to the data receiving party, the missing data corresponding to the serial number identification of each missing data is sent to the data receiving party in a centralized manner, so that the data transmission efficiency is improved.
Fig. 4 is a schematic structural diagram of an electronic device provided in the present invention, and as shown in fig. 4, the electronic device may include: a processor (processor)410, a communication Interface 420, a memory (memory)430 and a communication bus 440, wherein the processor 410, the communication Interface 420 and the memory 430 are communicated with each other via the communication bus 440. The processor 410 may invoke logic instructions in the memory 430 to perform a data transfer method comprising: sequentially sending the data of each data group in M data groups corresponding to the data to be sent to a data receiving party, receiving the missing data serial number identification fed back by the data receiving party aiming at each data group, and sending the missing data corresponding to the missing data serial number identification to the data receiving party; m is a positive integer; and under the condition that all the data of the M data groups are sent to the data receiving side, sending the missing data corresponding to each missing data sequence number identification to the data receiving side.
In addition, the logic instructions in the memory 430 may be implemented in the form of software functional units and stored in a computer readable storage medium when the software functional units are sold or used as independent products. 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: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other various media capable of storing program codes.
In another aspect, the present invention also provides a computer program product, the computer program product including a computer program, the computer program being storable on a non-transitory computer-readable storage medium, the computer program being capable of executing, when executed by a processor, the data transmission method provided by the above methods, the method including: sequentially sending the data of each data group in M data groups corresponding to the data to be sent to a data receiving party, receiving the missing data serial number identification fed back by the data receiving party aiming at each data group, and sending the missing data corresponding to the missing data serial number identification to the data receiving party; m is a positive integer; and under the condition that all the data of the M data groups are sent to the data receiving side, sending the missing data corresponding to each missing data sequence number identification to the data receiving side.
In yet another aspect, the present invention also provides a non-transitory computer-readable storage medium, on which a computer program is stored, the computer program being implemented by a processor to execute the data transmission method provided by the above methods, the method including: sequentially sending the data of each data group in M data groups corresponding to the data to be sent to a data receiving party, receiving a missing data serial number identifier fed back by the data receiving party aiming at each data group, and sending the missing data corresponding to the missing data serial number identifier to the data receiving party; m is a positive integer; and under the condition that all the data of the M data groups are sent to the data receiving side, sending the missing data corresponding to each missing data sequence number identification to the data receiving side.
The above-described embodiments of the apparatus are merely illustrative, and the units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one position, or may be distributed on multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the present embodiment. One of ordinary skill in the art can understand and implement it without inventive effort.
Through the above description of the embodiments, those skilled in the art will clearly understand that each embodiment can be implemented by software plus a necessary general hardware platform, and certainly can also be implemented by hardware. With this understanding in mind, the above-described technical solutions may be embodied in the form of a software product, which can be stored in a computer-readable storage medium such as ROM/RAM, magnetic disk, optical disk, etc., and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute the methods described in the embodiments or some parts of the embodiments.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; 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 data transmission method applied to a data sender, comprising:
sequentially sending the data of each data packet in M data packets corresponding to the data to be sent to a data receiving party, receiving a missing data serial number identifier fed back by the data receiving party aiming at each data packet, and sending the missing data corresponding to the missing data serial number identifier to the data receiving party; m is a positive integer;
and under the condition that all the data of the M data packets are sent to the data receiving side, sending the missing data corresponding to each missing data serial number identification to the data receiving side.
2. The data transmission method according to claim 1, wherein before the sequentially sending the data of each of the M data packets corresponding to the data to be sent to the data receiving side, the method includes:
acquiring time delay information;
and grouping the data to be transmitted based on the time delay information.
3. The data transmission method according to any one of claims 1 to 2, wherein the sequentially sending the data of each of the M data packets corresponding to the data to be sent to the data receiving side includes:
and based on a User Datagram Protocol (UDP), sequentially sending the data of each data group in the M data groups corresponding to the data to be sent to the data receiver.
4. The data transmission method according to claim 3, wherein the sequentially sending the data of each of the M data packets corresponding to the data to be sent to the data receiving side includes:
acquiring network bandwidth information and the time delay information, and determining data transmission gap duration according to the network bandwidth information and the time delay information;
and based on the data sending interval duration, sequentially sending the data of each data packet in the M data packets corresponding to the data to be sent to the data receiver.
5. The data transmission method according to any one of claims 1 to 4, wherein the missing data sequence number identifier is fed back to the data sender by the data receiver when a preset condition is met.
6. The data transmission method according to claim 1, wherein after the sending of the missing data corresponding to each missing data sequence number identifier to the data receiving side, the method includes:
sending a data packet transmission completion instruction to the data receiver, wherein the data packet transmission completion instruction is used for the data receiver to judge whether the data packet transmission is finished;
and when the data packet is not transmitted completely, executing the step of transmitting the missing data corresponding to each missing data sequence number identification to the data receiving side.
7. The data transmission method according to claim 6, wherein the sending the data packet transmission completion instruction to the data receiving side comprises:
and sending the data packet transmission completion instruction to the data receiving party based on a Transmission Control Protocol (TCP).
8. An electronic device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, wherein the processor implements the data transmission method according to any one of claims 1 to 7 when executing the program.
9. A non-transitory computer-readable storage medium, on which a computer program is stored, the computer program, when being executed by a processor, implementing the data transmission method according to any one of claims 1 to 7.
10. A computer program product comprising a computer program, wherein the computer program when executed by a processor implements a data transmission method as claimed in any one of claims 1 to 7.
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