CN106301714B - A kind of data transmission method and device - Google Patents
A kind of data transmission method and device Download PDFInfo
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- CN106301714B CN106301714B CN201610674291.1A CN201610674291A CN106301714B CN 106301714 B CN106301714 B CN 106301714B CN 201610674291 A CN201610674291 A CN 201610674291A CN 106301714 B CN106301714 B CN 106301714B
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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
- H04L1/22—Arrangements for detecting or preventing errors in the information received using redundant apparatus to increase reliability
Abstract
The present invention provides a kind of data transmission method and device, this method comprises: transmitting terminal carries out redundancy encoding to the data in current data group to be sent according to the corresponding redundancy coding parameters of current data group to be sent；Data in current data group to be sent after redundancy encoding are sent to receiving end by the transmitting terminal.The present invention can reduce transmitting terminal to receiving end sends the packet loss of data, reduction to the probability of receiving end transmission data, improves the rate that data are sent repeatedly.
Description
Technical field
The present invention relates to network communication technology field more particularly to a kind of data transmission methods and device.
Background technique
(wherein, the full name in English of TCP is Transmission Control Protocol to TCP/IP, and Chinese name is to pass
Transport control protocol view, the full name in English of IP are Internet Protocol, and Chinese name is Internet Protocol) protocol family exists
Transport layer provides two kinds of common transport protocols, and one is reliably based on the TCP transmission for establishing connection and streaming, another kind
Be it is insecure without connection and based on datagram UDP (full name in English be User Datagram Protocol, Chinese name
For User Datagram Protocol) transmission.The characteristics of carrying out network transmission using TCP mode is to guarantee reliable transmission by protocol stack,
And using UDP mode, then protocol stack will not be responsible for reliable transmission.The reliable transport mechanism of TCP provides greatly just for user
Benefit, but there are also not applicable places compared to UDP by TCP: such as Transmission Control Protocol seems compared to UDP than cumbersome, agreement itself
Expense it is bigger；And Transmission Control Protocol performance under conditions of network condition is bad is not high, the bandwidth for showing as uplink is not high, under
Capable pressure is larger；In the case where being related to the scene that NAT is passed through, the connection of TCP is established handshake procedure and is difficult to realize simultaneously, more suitable at this time
Close the transmission mode for using UDP.
May data be transmitted with the requirement for having reliability in practical applications, therefore, just needed in many business scenarios
Consider that service-strong UDP is transmitted.Reliable transmission is realized by UDP, and the basic ideas of realization, which are to provide, receives the other end
The confirmation of data.Generally there are two types of implementations for this confirmation: one is the reliability guarantors based on simple stop-wait protocol
Card technology is usually used in the realization of some light weights, such as (full name in English is Trivial File Transfer to common TFTP
Protocol, Chinese name are Simple File Transfer Protocol) agreement be exactly realized on UDP by stop-wait protocol
Reliable UDP transmission.Another kind is the Reliability Assurance technology based on sliding window, and sliding window technique, which is capable of providing to compare, to stop
Only-wait the faster transmission rate of agreement.Both realizations have no essential difference, only the opportunity in data transmission and other side couple
It is different in the mechanism that the data received are confirmed.
Reliable UDP transmission data validation is achieved in that a timer is arranged when sending by sender substantially, works as number
If rear until timer expiry obtains the confirmation of other side not yet according to sending, the data are just retransmitted.
But the positive data packet sent may lose on network, the confirmation packet reversely sent may also be in network
Upper loss, wherein forward direction, which is sent, refers to that, from transmitting terminal to receiving end transmission UDP message packet, reversed send refers to receiving end to transmitting terminal
Send the confirmation packet for determining and receiving UDP message packet.No matter for stop-wait or sliding window, forward data packet is lost
Mistake will wait time-out and be retransmitted, and the loss of reverse data packet also results in transmitting terminal time-out and retransmits, and work as data packet
Or when confirmation packet loss, will cause the re-transmission repeatedly of forward data packet, this produces unnecessary load on network, while etc.
Process to time-out has severely impacted the rate of data packet transmission.
Summary of the invention
The present invention provides a kind of data transmission method and device, existing in the prior art due to forward data packet to solve
Re-transmission repeatedly and caused by unnecessary load is led to the problem of on network, and, wait time-out process caused by number
According to the low problem of the rate of packet transmission.
A kind of data transmission method, comprising:
Transmitting terminal is according to the currently corresponding redundancy coding parameters of data group to be sent, to the number in current data group to be sent
According to progress redundancy encoding；
Data in current data group to be sent after redundancy encoding are sent to receiving end by the transmitting terminal.
The method is in the following ways grouped data to be sent, obtains several data groups to be sent:
Data to be sent are obtained from buffer area, the data volume of the data to be sent of the acquisition is not more than current send window
Mouthful；
According to the transmission sequence of the data to be sent of acquisition, according to Fibonacci sequence, to the number to be sent of the acquisition
According to being grouped, several data groups to be sent are obtained.
The method determines the corresponding redundancy coding parameters of current data group to be sent in the following way:
Current data group to be sent is first data group and is when sending first data group for the first time, to determine current
The corresponding redundancy coding parameters of data group to be sent are 0；
When current data group to be sent is first data group that non-first data group or non-first time are sent, according to
It has each sent the packet loss number of data group and has each sent the transmission times of data group, determined current data group to be sent
Corresponding redundancy coding parameters.
In the method, according to each packet loss number for having sent data group and each transmission for having sent data group time
Number determines the corresponding redundancy coding parameters of current data group to be sent, specifically includes:
Data group is sent for each, statistics sends the packet loss number for having sent data group every time, and determines and occur
Packet loss event；
Statistics loses the number that k number occurs according to the packet loss event of packet, wherein successively 0~N of value, N are individual data to k
The data packet number upper limit included in group, k are integer；
According to predetermined probabilities model, sends the packet loss number for having sent data group every time and lose k number according to packet
The number that packet loss event occurs determines that the probability P (0) for the packet loss event generation for losing 0 data packet arrives and loses j data packet
Packet loss event occur probability P (j) and value, wherein j≤N, j are integer；
Determine the minimum value in all packet loss number j for meeting preset condition, wherein preset condition is that described and value is greater than
Or it is equal to predetermined probabilities threshold value, the predetermined probabilities threshold value is for characterizing the probability that receiving end is successfully received data；
Determining minimum value is determined as the corresponding redundancy coding parameters of current data group to be sent.
In the method, the probability P (0) that the determining packet loss event for losing 0 data packet occurs, which arrives, loses j data
The probability P (j) that the packet loss event of packet occurs and value, specifically include:
According to k number is lost according to the packet loss event number occurred of packet and the data packet number k of loss, Poisson point is determined
The value of parameter lambda in cloth probabilistic model；
It is general to determine that the packet loss event for losing 0 data packet occurs for Poisson distribution probabilistic model after being determined according to parameter lambda
The probability P (j) that rate P (0) occurs to the packet loss event for losing j data packet and be worth, wherein j≤N, j are integer；
Wherein,Preset condition are as follows:Wherein, PTHIndicate predetermined probabilities threshold value,Indicate described and value.
In the method, statistics sends the packet loss number for having sent data group every time, specifically includes:
It sends after this has sent data group, starts this and sent the corresponding timer of data group；
Determine the timer then, and, when not receiving the confirmation packet of receiving end transmission, determine that this has sent data group
Packet loss number be this sent the data packet number in data group；
Before determining the timer then, when receiving the confirmation packet of receiving end transmission, determine that this has sent data group
Packet loss number is the packet loss number carried in the confirmation packet.
The method, further includes:
Determine that the characterization that is used for for not receiving receiving end transmission in preset duration receives the current data to be sent
The data in current data group to be sent when the confirmation packet of group, after sending redundancy encoding to receiving end again.
The present invention also provides a kind of data transmission methods, comprising:
The number that receiving end determines the data group after receiving the redundancy encoding that transmitting terminal is sent and is successfully decoded in the data group
According to when, generate be directed to the data group confirmation packet；
According to default redundancy coding parameters, the confirmation is wrapped and carries out redundancy encoding；
Confirmation packet after sending from redundancy encoding to the transmitting terminal.
The method, further includes:
For each calculating cycle in preset number calculating cycle, according to the data in the data group after redundancy encoding
Packet number calculates the difference of the data packet number in the data group and the data packet number in the data group being currently received, obtains
To the budget cycle corresponding packet loss number；
It determines the maximum value in the corresponding packet loss number of preset number calculating cycle, which is determined as transmitting terminal
Single sends the packet loss number after the data group；
Packet loss number after single to be sent to the data group, which is carried, is sent to transmission in the confirmation packet for the data group
End.
The present invention also provides a kind of data transmission devices, comprising:
Coding unit is used for according to the currently corresponding redundancy coding parameters of data group to be sent, to current data to be sent
Data in group carry out redundancy encoding；
Transmission unit, for the data in the current data group to be sent after redundancy encoding to be sent to receiving end.
Described device, further includes:
Grouped element obtains several data groups to be sent for being grouped in the following ways to data to be sent:
Data to be sent are obtained from buffer area, the data volume of the data to be sent of the acquisition is not more than current send window
Mouthful；
According to the transmission sequence of the data to be sent of acquisition, according to Fibonacci sequence, to the number to be sent of the acquisition
According to being grouped, several data groups to be sent are obtained.
Described device, further includes:
Determination unit, for determining the corresponding redundancy coding parameters of current data group to be sent in the following way:
Current data group to be sent is first data group and is when sending first data group for the first time, to determine current
The corresponding redundancy coding parameters of data group to be sent are 0；
When current data group to be sent is first data group that non-first data group or non-first time are sent, according to
It has each sent the packet loss number of data group and has each sent the transmission times of data group, determined current data group to be sent
Corresponding redundancy coding parameters.
In described device, the determination unit has been sent in each packet loss number for having sent data group of basis and each
The transmission times of data group is specifically used for when determining the corresponding redundancy coding parameters of current data group to be sent:
Data group is sent for each, statistics sends the packet loss number for having sent data group every time, and determines and occur
Packet loss event；
Statistics loses the number that k number occurs according to the packet loss event of packet, wherein successively 0~N of value, N are individual data to k
The data packet number upper limit included in group, k are integer；
According to predetermined probabilities model, sends the packet loss number for having sent data group every time and lose k number according to packet
The number that packet loss event occurs determines that the probability P (0) for the packet loss event generation for losing 0 data packet arrives and loses j data packet
Packet loss event occur probability P (j) and value, wherein j≤N, j are integer；
Determine the minimum value in all packet loss number j for meeting preset condition, wherein preset condition is that described and value is greater than
Or it is equal to predetermined probabilities threshold value, the predetermined probabilities threshold value is for characterizing the probability that receiving end is successfully received data；
Determining minimum value is determined as the corresponding redundancy coding parameters of current data group to be sent.
In described device, the probability P (0) that the determining packet loss event for losing 0 data packet occurs, which arrives, loses j data
The probability P (j) that the packet loss event of packet occurs and value, specifically include:
According to k number is lost according to the packet loss event number occurred of packet and the data packet number k of loss, Poisson point is determined
The value of parameter lambda in cloth probabilistic model；
It is general to determine that the packet loss event for losing 0 data packet occurs for Poisson distribution probabilistic model after being determined according to parameter lambda
The probability P (j) that rate P (0) occurs to the packet loss event for losing j data packet and be worth, wherein j≤N, j are integer；
Wherein,Preset condition are as follows:Wherein, PTHIndicate predetermined probabilities threshold value,Indicate described and value.
In described device, the determination unit is when statistics sends the packet loss number for having sent data group every time, specifically
For:
It sends after this has sent data group, starts this and sent the corresponding timer of data group；
Determine the timer then, and, when not receiving the confirmation packet of receiving end transmission, determine that this has sent data group
Packet loss number be this sent the data packet number in data group；
Before determining the timer then, when receiving the confirmation packet of receiving end transmission, determine that this has sent data group
Packet loss number is the packet loss number carried in the confirmation packet.
In described device, the transmission unit is also used to:
Determine that the characterization that is used for for not receiving receiving end transmission in preset duration receives the current data to be sent
The data in current data group to be sent when the confirmation packet of group, after sending redundancy encoding to receiving end again.
The present invention also provides a kind of data transmission devices, comprising:
Generation unit, for determining the data group after receiving the redundancy encoding that transmitting terminal is sent and the data group being successfully decoded
In data when, generate be directed to the data group confirmation packet；
Coding unit, for being wrapped to the confirmation and carrying out redundancy encoding according to redundancy coding parameters are preset；
Transmission unit, for the confirmation packet after sending redundancy encoding to the transmitting terminal.
In described device, the transmission unit is also used to:
For each calculating cycle in preset number calculating cycle, according to the data in the data group after redundancy encoding
Packet number calculates the difference of the data packet number in the data group and the data packet number in the data group being currently received, obtains
To the budget cycle corresponding packet loss number；
It determines the maximum value in the corresponding packet loss number of preset number calculating cycle, which is determined as transmitting terminal
Single sends the packet loss number after the data group；
Packet loss number after single to be sent to the data group, which is carried, is sent to transmission in the confirmation packet for the data group
End.
Using data transfer mode provided in an embodiment of the present invention and device, have the advantages that due to pending
Data are sent to carry out redundancy encoding, so that receiving end can be improved the general of successfully decoded when decoding the data that transmitting terminal is sent
Rate can also drop to a certain extent to reduce the packet loss that transmitting terminal sends data to receiving end to a certain extent
Transmitting terminal caused by the low failure due to decoding sends the probability of data to receiving end repeatedly, while avoiding to a certain extent
Unnecessary load is generated on network, improves the rate of data transmission.
Detailed description of the invention
Fig. 1 is the data transmission method flow chart of transmitting terminal provided in an embodiment of the present invention；
Fig. 2 is the method flow diagram provided in an embodiment of the present invention being grouped to data to be sent；
Fig. 3 is the method stream of the current corresponding redundancy coding parameters of data group to be sent of determination provided in an embodiment of the present invention
Cheng Tu；
Fig. 4 determines the corresponding redundancy encoding of current data group to be sent using probabilistic model to be provided in an embodiment of the present invention
The method flow diagram of parameter；
Fig. 5 is the method flow for the packet loss number that statistics provided in an embodiment of the present invention has sent data group every time
Figure；
Fig. 6 is the data transmission method flow chart of receiving end provided in an embodiment of the present invention；
Fig. 7 is the packet loss number of statistical data group provided in an embodiment of the present invention and the method flow for being sent to transmitting terminal
Figure；
Fig. 8 is the data transmission device schematic diagram of transmitting terminal provided in an embodiment of the present invention；
Fig. 9 is the data transmission device schematic diagram of receiving end provided in an embodiment of the present invention.
Specific embodiment
Data transmission method provided by the invention is described in more detail with reference to the accompanying drawings and examples.
The embodiment of the present invention provides a kind of data transmission method, as shown in Figure 1, comprising:
Step 101, transmitting terminal is according to the currently corresponding redundancy coding parameters of data group to be sent, to current data to be sent
Data in group carry out redundancy encoding.
Step 102, the data in the current data group to be sent after redundancy encoding are sent to receiving end by transmitting terminal.
Specifically, obtaining data as current data to be sent from buffer area, and current data to be sent are grouped,
Wherein, current data to be sent are UDP message packet to be sent.Redundancy coding parameters are for indicating in current data group to be sent
It is identical can to preset the corresponding redundancy coding parameters of each data group to be sent for the amount of redundancy of data, for example, be 10,
It may be other numerical value, here without limitation；Different redundancy encoding ginsengs can also be set for each data group to be sent in advance
Number can also predefine the corresponding redundancy coding parameters of current data group to be sent, here without limitation according to other way.
The embodiment of the present invention, transmitting terminal is before sending each data group to be sent, to the data in the data group to be sent
Redundancy encoding is carried out, the data group after redundancy encoding is sent to receiving end, receiving end is according to the decoding side arranged with transmitting terminal
Formula is decoded the data group received.
The embodiment of the present invention is due to having carried out redundancy encoding to data to be sent, so that receiving end is sent in decoding transmitting terminal
Data when, can be improved the probability of successfully decoded, thus reduce to a certain extent transmitting terminal to receiving end send data
Packet loss, can also reduce to a certain extent since transmitting terminal caused by decoding failure sends data to receiving end repeatedly
Probability, while avoiding generate unnecessary load on network to a certain extent, improve the rate of data transmission.
Preferably, data to be sent are grouped using content shown in Fig. 2, obtain several data groups to be sent:
Step 201, data to be sent are obtained from buffer area, the data volume of the data to be sent of the acquisition, which is not more than, to be worked as
Preceding transmission window.
Specifically, buffer area is for storing data to be sent, i.e., UDP packet to be sent is obtained from buffer area every time
The data volume of data to be sent is no more than currently transmitted window, and currently transmitted window is transmission window and the receiving end of transmitting terminal
The smaller value in window is received, such as: the maximum value that currently transmitted window allows is 10 UDP packets, then this is from buffer area
The number for the UDP packet that the data to be sent obtained include is no more than 10.
Step 202, according to the transmission sequence of current data to be sent, according to Fibonacci sequence, to current number to be sent
According to being grouped.
Specifically, the number for the data packet for including in each grouping meets Fibonacci number when executing division operation every time
Column, the corresponding formula of Fibonacci sequence are as follows:
F (0)=0, F (1)=1, F (Q)=F (Q-1)+F (Q-2), wherein Q is the positive integer more than or equal to 2.
That is, after being grouped according to Fibonacci sequence to current data to be sent, data that first data group includes
Packet number is 1, and the data packet number that second data group includes is 2, and the data packet number that third data group includes is 3, Q
The data packet number that a data group includes is F (Q-1)+F (Q-2).Current data to be sent are carried out using Fibonacci sequence
After grouping, not only the number of data packet in data group can be made more and more, but also be unlikely to so that the number for including in each data group
It is too fast according to the growth of packet number, to increase the rate of the data packet of transmission in the preferable situation of Network status.In Network status
When poor, the number of data packet in current data group to be sent can be suitably reduced, to reduce packet loss.
The embodiment that Fig. 2 is provided is only a kind of mode being preferably grouped to data to be sent, can also be set each
The size for the data volume for including in a data group to be sent is identical, or using it is other can carry out data grouping by the way of.
Preferably, the corresponding redundancy coding parameters of current data group to be sent are determined using content shown in Fig. 3:
Step 301, judge whether current data group to be sent is to send first data group for the first time, if so, executing
Step 302, otherwise, step 303 is executed.
Step 302, determine that the corresponding redundancy coding parameters of current data group to be sent are 0.
Specifically, determining that currently data group to be sent is first data group and is to send first data for the first time
When group, 0 is set by the currently corresponding redundancy coding parameters of data group to be sent, i.e., current data group to be sent is not carried out superfluous
Remaining coding, alternatively, other values can also be set by currently data group to be sent corresponding redundancy coding parameters, thus for the first time
When sending first data group, redundancy encoding just is carried out to the data in the data group.
Step 303, the transmission times of data group has been sent according to each packet loss number for having sent data group and each,
Determine the corresponding redundancy coding parameters of current data group to be sent.
Specifically, determining that current data group to be sent is first that non-first data group or non-first time are sent
When data group, worked as according to each packet loss number for having sent data group and each transmission times for having sent data group, determination
The corresponding redundancy coding parameters of preceding data group to be sent.
Since the transmission of UDP message packet has certain sequencing, the embodiment of the present invention, in the grouping to data to be sent
After operation executes completion, according to the sequencing that UDP message packet is sent, data to be sent are grouped, are sent for the first time
When first data group, which is set as 0, may be set to be other values.Such as
After fruit sends a data group, does not receive the confirmation packet for the data group of receiving end transmission in preset duration, then need
The data group is retransmitted, before retransmitting the data group, sends each packet loss for having sent data group according to each
Number, and the transmission times of data group has each been sent, determine the corresponding redundancy coding parameters of the data group of the retransmission；Such as
After fruit sends a data group, the confirmation packet for the data group of receiving end transmission is received in preset duration, according to
The packet loss number for each having sent data group is sent every time, and has each sent the transmission times of data group, is determined next
The corresponding redundancy coding parameters of data group to be sent, wherein sent data group and referred to before current data group to be sent
The data group of transmission.
The embodiment of the present invention can determine current data group to be sent in real time according to the packet drop for having sent data group
Corresponding redundancy coding parameters, to obtain the redundancy coding parameters for being more in line with current network conditions, make it is determining it is current to
It is relatively reliable accurate to send the corresponding redundancy coding parameters of data group.
Preferably, the transmission times of data group has been sent according to each packet loss number for having sent data group and each,
Determine the corresponding redundancy coding parameters of current data group to be sent, as shown in figure 4, specifically including:
Step 401, data group having been sent for each, statistics sends the packet loss number for having sent data group every time, and
It determines and a packet loss event occurs.
Specifically, statistics sends the packet loss number of the data group every time, and determines and occur once for data group has been sent
Packet loss event.
Step 402, statistics loses the number that k number occurs according to the packet loss event of packet, wherein successively 0~N of value, N are k
The data packet number upper limit included in individual data group, k are integer.
Specifically, each having sent packet loss number lost in data group according to each send, and sends and each sent out
Send data packet transmission times, statistics loses k number according to the number of the packet loss event of packet, at this point, k successively 0~N of value, such as: N
Equal to 2, it is transmitted across 3 data groups altogether, and the case where without data group is retransmitted, then, counts lose 0 number in 3 times respectively
According to the number of packet, loses the number of 1 data packet and lose the number of 2 data packets, wherein N is integer and the value of N
It can be set according to practical application scene, here without limitation.
Step 403, the packet loss number for having sent data group and loss k are sent according to predetermined probabilities model, every time
The number that the packet loss event of data packet occurs determines that the probability P (0) for the packet loss event generation for losing 0 data packet arrives and loses j
The probability P (j) that the packet loss event of data packet occurs and value, wherein j≤N, j are integer.
Specifically, the probability P (0) that the packet loss event for losing 0 data packet occurs arrives the packet loss event for losing j data packet
The probability P (j) of generation and value beWherein, 0≤i≤j and i are integer, continue to use the example above, false if N=3
If the number for losing 0 data packet in 3 times is 0, the number for losing 1 data packet is 1 and the number of 2 data packets of loss is
2, j values are 2, then, lose the probability P (0) of the packet loss event generation of 0 data packet to the packet loss event of 3 data packets of loss
The probability P (3) of generation and value are as follows:P (0), P (1) and P (2) can be according to predetermined probabilities
Model determines.
Step 404, the minimum value in all packet loss number j for meeting preset condition is determined, wherein preset condition is described
It is greater than or equal to predetermined probabilities threshold value with value, the predetermined probabilities threshold value is successfully received the general of data for characterizing receiving end
Rate.
Specifically, the probability that expectation receiving end is successfully received data can be set according to practical application scene, that is, step
Predetermined probabilities threshold value P in 404TH, then calculateWith in all packet loss number j for meeting preset condition of determination most
Small value.Continue to use the example above, if N=3, it is assumed that the number for losing 0 data packet in 3 times is 0, loses time of 1 data packet
Number for 1 and lose 2 data packets numbers be 2, j value be can be 0,1,2, then, and calculate separately P (0), P (0)+P (1),
P (0)+P (1)+P (2), if P (0)+P (1) is greater than or equal to PTH, and P (0)+P (1)+P (2) is greater than or equal to PTHWhen, then
Lesser j value is chosen, i.e., j value is 1 at this time.
Step 405, determining minimum value is determined as the corresponding redundancy coding parameters of current data group to be sent.
The embodiment of the present invention determines all more than or equal to predetermined probabilities threshold before current data group to be sent is sent
In be worth and value, the minimum value of packet loss number j, to determine the corresponding redundancy coding parameters of current data group to be sent, to mention
High receiving end is successfully connected to the probability of current data group to be sent.
In step 403, preset probabilistic model can be excellent for Poisson distribution probabilistic model, chi square distribution probabilistic model etc.
Selection of land, preset probabilistic model is Poisson distribution, then in step 403, it is general to determine that the packet loss event for losing 0 data packet occurs
The probability P (j) that rate P (0) occurs to the packet loss event for losing j data packet and value, specifically include: according to loss k number evidence
The data packet number k of number and loss that the packet loss event of packet occurs, determines the parameter lambda in Poisson distribution probabilistic model
Value；Poisson distribution probabilistic model after being determined according to parameter lambda determines the probability P that the packet loss event for losing 0 data packet occurs
(0) probability P (j) occurred to the packet loss event for losing j data packet and be worth, wherein j≤N, j are integer.
Specifically, determining the value of parameter lambda using following formula:
Wherein, nkIt indicates to lose the number that k number occurs according to the packet loss event of packet,Expression has been sent out
The total degree for sending data group continues to use the example above, if N=3, it is assumed that the number that 0 data packet is lost in 3 times is 0, loses 1
The number of a data packet is 1 and the number of 2 data packets of loss is 2, then,
Specifically, Poisson distribution probabilistic model are as follows:Wherein, the value of parameter lambda has determined that.
The probability P (0) for losing the packet loss event generation of 0 data packet arrives the packet loss event generation for losing j data packet
Probability P (j) and value be0≤i≤j integer, whereinContinue to use the example above, if N=3,
Assuming that the number for losing 0 data packet in 3 times is 0, the number for losing 1 data packet is 1 and loses the number of 2 data packets
It is 2 for 2, j value, then, loses the probability P (0) of the packet loss event generation of 0 data packet to the packet loss thing of 3 data packets of loss
Part occur probability P (3) and value are as follows:P (0), P (1) and P (2) can be according to parameter lambdas
Poisson distribution probabilistic model after determination determines, is not detailed here.Wherein, preset condition are as follows:Wherein, PTH
Indicate predetermined probabilities threshold value,Indicate described and value.
The embodiment of the present invention first determines the ginseng in Poisson distribution probabilistic model before current data group to be sent is sent
Number λ, the Poisson distribution probabilistic model after determining further according to parameter lambda determine the probability that the packet loss event for losing 0 data packet occurs
The probability P (j) that P (0) occurs to the packet loss event for losing j data packet and value, later, determine it is all be greater than or equal to preset
Probability threshold value and in value, the minimum value of packet loss number j, to determine the corresponding redundancy coding parameters of current data group to be sent,
To improve the probability that receiving end is successfully connected to current data group to be sent.
Preferably, the content provided using Fig. 5, statistics send the packet loss number for having sent data group every time, specific to wrap
It includes:
Step 501, it sends after this has sent data group, starts this and sent the corresponding timer of data group.
Specifically, a timer is arranged for each data group, after transmitting terminal sends the data group, start the data group pair
The timer answered.
Step 502, judge receiving end transmission whether is received before this has sent the corresponding timer of data group then
Otherwise confirmation packet, executes step 503 if so, executing step 504.
Step 503, determining that this has sent the packet loss number of data group is that this has sent the data packet number in data group.
Specifically, work as the timer then, and, when not receiving the confirmation packet of receiving end transmission, determine that this has sent
The packet loss number of data group is that this has sent the data packet number in data group, that is, this has sent all data in data group
Packet is lost.
Step 504, determining that this has sent the packet loss number of data group is the packet loss number carried in the confirmation packet.
Specifically, when receiving the confirmation packet of receiving end transmission, determining that this has sent before determining the timer then
The packet loss number of data group is the packet loss number carried in the confirmation packet, and the packet loss number carried in confirmation packet is counted by receiving end
It obtains, concrete implementation mode will do it below to be discussed in detail.
Specifically, determine do not received in preset duration receiving end transmission for characterize receive it is described current pending
The data in current data group to be sent when sending the confirmation packet of data group, after sending redundancy encoding to receiving end again.Wherein,
The current corresponding timer of data group to be sent, the when a length of preset duration of the timer, if current data group to be sent
After transmission, do not received in preset duration receiving end transmission characterization receive currently data group to be sent confirmation packet when,
The data in current data group to be sent after then sending redundancy encoding to receiving end again, until receiving end is for current pending
Data group is sent to send confirmation packet.
It is that the introduction of the data transmission method based on transmitting terminal proposes the embodiment of the present invention below based on transmitting terminal above
The data transmission method of confession is introduced, as shown in Figure 6, comprising:
Step 601, receiving end determines the data group after receiving the redundancy encoding that transmitting terminal is sent and the data is successfully decoded
When data in group, the confirmation packet for being directed to the data group is generated.
Step 602, according to default redundancy coding parameters, the confirmation is wrapped and carries out redundancy encoding.
Step 603, Xiang Suoshu transmitting terminal sends the confirmation packet after redundancy encoding.
The embodiment of the present invention, receiving end determine be properly received transmitting terminal send data group, and according to transmitting terminal about
Fixed decoding process when to data group successfully decoded, generates the confirmation packet for being directed to the data group, and join according to default redundancy encoding
After several progress redundancy encodings to the confirmation packet, the confirmation packet after redundancy encoding is sent to transmitting terminal, such as setting redundancy encoding
Parameter is 1, or other values, here without limitation.
Same confirmation packet can also be set and send setting number time, to improve the probability that transmitting terminal receives confirmation packet.
When sending confirmation packet to transmitting terminal due to receiving end, it is also possible to confirmation packet can be lost, will lead to send in this way
End repeats to send data group, the embodiment of the present invention, by will confirm that packet carries out redundancy encoding, to improve to a certain extent
Transmitting terminal is properly received the probability of confirmation packet.
Preferably, receiving end also counts the packet loss number for the data group being currently received in the following way and is sent to hair
Sending end, as shown in fig. 7, comprises:
Step 701, for each calculating cycle in preset number calculating cycle, according to the data group after redundancy encoding
In data packet number, calculate data packet number in the data group and the data packet number in the data group that is currently received
Difference, obtain the budget cycle corresponding packet loss number.
Specifically, receiving end receives the data in current data group on one side, it is current that cut-off current calculation cycle is calculated on one side
Packet loss number in data group.
Step 702, it determines the maximum value in the corresponding packet loss number of preset number calculating cycle, which is determined
Packet loss number after sending the data group for transmitting terminal single.
Step 703, the packet loss number after single to be sent to the data group is carried in the confirmation Bao Zhongfa for being directed to the data group
Give transmitting terminal.
The embodiment of the present invention, the packet loss number of the statistics available data group being currently being received, and wrapped by confirmation by packet loss
Number feeds back to transmitting terminal, so that the packet loss number that transmitting terminal has sent data group according to upper one, determines current data to be sent
The corresponding redundancy coding parameters of group.
Based on inventive concept same as the data transmission method of transmitting terminal provided in an embodiment of the present invention, the present invention is implemented
Example also provides a kind of data transmission device, as shown in Figure 8, comprising:
Coding unit 801 is used for according to the currently corresponding redundancy coding parameters of data group to be sent, to current number to be sent
Redundancy encoding is carried out according to the data in group；
Transmission unit 802, for the data in the current data group to be sent after redundancy encoding to be sent to receiving end.
Preferably, described device, further includes:
Grouped element 803 obtains several data to be sent for being grouped in the following ways to data to be sent
Group:
Data to be sent are obtained from buffer area, the data volume of the data to be sent of the acquisition is not more than current send window
Mouthful；
According to the transmission sequence of the data to be sent of acquisition, according to Fibonacci sequence, to the number to be sent of the acquisition
According to being grouped, several data groups to be sent are obtained.
Preferably, described device, further includes:
Determination unit 804, for determining the corresponding redundancy coding parameters of current data group to be sent in the following way:
Current data group to be sent is first data group and is when sending first data group for the first time, to determine current
The corresponding redundancy coding parameters of data group to be sent are 0；
When current data group to be sent is first data group that non-first data group or non-first time are sent, according to
It has each sent the packet loss number of data group and has each sent the transmission times of data group, determined current data group to be sent
Corresponding redundancy coding parameters.
Preferably, in described device, the determination unit is according to the packet loss number for each having sent data group and often
A transmission times for having sent data group is specifically used for when determining the corresponding redundancy coding parameters of current data group to be sent:
Data group is sent for each, statistics sends the packet loss number for having sent data group every time, and determines and occur
Packet loss event；
Statistics loses the number that k number occurs according to the packet loss event of packet, wherein successively 0~N of value, N are individual data to k
The data packet number upper limit included in group, k are integer；
According to predetermined probabilities model, sends the packet loss number for having sent data group every time and lose k number according to packet
The number that packet loss event occurs determines that the probability P (0) for the packet loss event generation for losing 0 data packet arrives and loses j data packet
Packet loss event occur probability P (j) and value, wherein j≤N, j are integer；
Determine the minimum value in all packet loss number j for meeting preset condition, wherein preset condition is that described and value is greater than
Or it is equal to predetermined probabilities threshold value, the predetermined probabilities threshold value is for characterizing the probability that receiving end is successfully received data；
Determining minimum value is determined as the corresponding redundancy coding parameters of current data group to be sent.
Preferably, in described device, the probability P (0) that the determining packet loss event for losing 0 data packet occurs, which arrives, loses
The probability P (j) that the packet loss event of j data packet occurs and value, specifically include:
According to k number is lost according to the packet loss event number occurred of packet and the data packet number k of loss, Poisson point is determined
The value of parameter lambda in cloth probabilistic model；
It is general to determine that the packet loss event for losing 0 data packet occurs for Poisson distribution probabilistic model after being determined according to parameter lambda
The probability P (j) that rate P (0) occurs to the packet loss event for losing j data packet and be worth, wherein j≤N, j are integer；
Wherein,Preset condition are as follows:Wherein, PTHIndicate predetermined probabilities threshold value,Indicate described and value.
Preferably, in described device, the determination unit sends the packet loss number for having sent data group in statistics every time
When, it is specifically used for:
It sends after this has sent data group, starts this and sent the corresponding timer of data group；
Determine the timer then, and, when not receiving the confirmation packet of receiving end transmission, determine that this has sent data group
Packet loss number be this sent the data packet number in data group；
Before determining the timer then, when receiving the confirmation packet of receiving end transmission, determine that this has sent data group
Packet loss number is the packet loss number carried in the confirmation packet.
Preferably, in described device, the transmission unit is also used to:
Determine that the characterization that is used for for not receiving receiving end transmission in preset duration receives the current data to be sent
The data in current data group to be sent when the confirmation packet of group, after sending redundancy encoding to receiving end again.
It is also mentioned based on the inventive concept present invention same as the data transmission method of receiving end provided in an embodiment of the present invention
For a kind of data transmission device, as shown in Figure 9, comprising:
Generation unit 901, for determining the data group after receiving the redundancy encoding that transmitting terminal is sent and the number being successfully decoded
When according to data in group, the confirmation packet for being directed to the data group is generated；
Coding unit 902, for being wrapped to the confirmation and carrying out redundancy encoding according to redundancy coding parameters are preset；
Transmission unit 903, for the confirmation packet after sending redundancy encoding to the transmitting terminal.
Preferably, in described device, the transmission unit is also used to:
For each calculating cycle in preset number calculating cycle, according to the data in the data group after redundancy encoding
Packet number calculates the difference of the data packet number in the data group and the data packet number in the data group being currently received, obtains
To the budget cycle corresponding packet loss number；
It determines the maximum value in the corresponding packet loss number of preset number calculating cycle, which is determined as transmitting terminal
Single sends the packet loss number after the data group；
Packet loss number after single to be sent to the data group, which is carried, is sent to transmission in the confirmation packet for the data group
End.
Using data transfer mode provided in an embodiment of the present invention and device, have the advantages that due to pending
Data are sent to carry out redundancy encoding, so that receiving end can be improved the general of successfully decoded when decoding the data that transmitting terminal is sent
Rate can also drop to a certain extent to reduce the packet loss that transmitting terminal sends data to receiving end to a certain extent
Transmitting terminal caused by the low failure due to decoding sends the probability of data to receiving end repeatedly, while avoiding to a certain extent
Unnecessary load is generated on network, improves the rate of data transmission.
The present invention be referring to according to the method for the embodiment of the present invention, the process of equipment (system) and computer program product
Figure and/or block diagram describe.It should be understood that every one stream in flowchart and/or the block diagram can be realized by computer program instructions
The combination of process and/or box in journey and/or box and flowchart and/or the block diagram.It can provide these computer programs
Instruct the processor of general purpose computer, special purpose computer, Embedded Processor or other programmable data processing devices to produce
A raw machine, so that being generated by the instruction that computer or the processor of other programmable data processing devices execute for real
The device for the function of being specified in present one or more flows of the flowchart and/or one or more blocks of the block diagram.
These computer program instructions, which may also be stored in, is able to guide computer or other programmable data processing devices with spy
Determine in the computer-readable memory that mode works, so that it includes referring to that instruction stored in the computer readable memory, which generates,
Enable the manufacture of device, the command device realize in one box of one or more flows of the flowchart and/or block diagram or
The function of being specified in multiple boxes.
These computer program instructions also can be loaded onto a computer or other programmable data processing device, so that counting
Series of operation steps are executed on calculation machine or other programmable devices to generate computer implemented processing, thus in computer or
The instruction executed on other programmable devices is provided for realizing in one or more flows of the flowchart and/or block diagram one
The step of function of being specified in a box or multiple boxes.
Although preferred embodiments of the present invention have been described, it is created once a person skilled in the art knows basic
Property concept, then additional changes and modifications may be made to these embodiments.So it includes excellent that the following claims are intended to be interpreted as
It selects embodiment and falls into all change and modification of the scope of the invention.
Obviously, various changes and modifications can be made to the invention without departing from essence of the invention by those skilled in the art
Mind and range.In this way, if these modifications and changes of the present invention belongs to the range of the claims in the present invention and its equivalent technologies
Within, then the present invention is also intended to include these modifications and variations.
Claims (16)
1. a kind of data transmission method characterized by comprising
Transmitting terminal according to the corresponding redundancy coding parameters of current data group to be sent, to the data in current data group to be sent into
Row redundancy encoding；
Data in current data group to be sent after redundancy encoding are sent to receiving end by the transmitting terminal；
Wherein, the corresponding redundancy coding parameters of each data group to be sent are identical or different；
When current data group to be sent is first data group that non-first data group or non-first time are sent, for each
Data group is sent, statistics sends the packet loss number for having sent data group every time, and determines and a packet loss event occurs；
Statistics loses the number that k number occurs according to the packet loss event of packet, wherein successively 0~N of value, N are in individual data group to k
The data packet number upper limit for being included, k is integer；
According to predetermined probabilities model, sends the packet loss number for having sent data group every time and lose k number according to the packet loss of packet
The number that event occurs, the probability P (0) for determining that the packet loss event for losing 0 data packet occurs arrive the packet loss for losing j data packet
Event occur probability P (j) and value, wherein j≤N, j are integer；
Determine the minimum value in all packet loss number j for meeting preset condition, wherein preset condition is that described and value is greater than or waits
In predetermined probabilities threshold value, the predetermined probabilities threshold value is for characterizing the probability that receiving end is successfully received data；
Determining minimum value is determined as the corresponding redundancy coding parameters of current data group to be sent.
2. the method as described in claim 1, which is characterized in that be grouped, obtain to data to be sent in the following ways
Several data groups to be sent:
Data to be sent are obtained from buffer area, the data volume of the data to be sent of the acquisition is not more than currently transmitted window；
According to the transmission sequence of the data to be sent of acquisition, according to Fibonacci sequence, to the data to be sent of the acquisition into
Row grouping, obtains several data groups to be sent.
3. the method as described in claim 1, which is characterized in that determine that current data group to be sent is corresponding in the following way
Redundancy coding parameters:
Current data group to be sent is first data group and is to determine current pending when sending first data group for the first time
Sending the corresponding redundancy coding parameters of data group is 0.
4. the method as described in claim 1, which is characterized in that the determining packet loss event for losing 0 data packet occurred
The probability P (j) that probability P (0) occurs to the packet loss event for losing j data packet and be worth, specifically include:
According to k number is lost according to the packet loss event number occurred of packet and the data packet number k of loss, determine that Poisson distribution is general
The value of parameter lambda in rate model；
Poisson distribution probabilistic model after being determined according to parameter lambda determines the probability P that the packet loss event for losing 0 data packet occurs
(0) probability P (j) occurred to the packet loss event for losing j data packet and be worth, wherein j≤N, j are integer；
Wherein, Poisson distribution probabilistic model isPreset condition are as follows:Wherein, PTHIndicate default
Probability threshold value,Indicate described and value.
5. method as described in claim 1 or 4, which is characterized in that statistics sends the packet loss for having sent data group every time
Number, specifically includes:
It sends after this has sent data group, starts this and sent the corresponding timer of data group；
Determine the timer then, and, when not receiving the confirmation packet of receiving end transmission, determine that this has sent losing for data group
Packet number is that this has sent the data packet number in data group；
Before determining the timer then, when receiving the confirmation packet of receiving end transmission, determine that this has sent the packet loss of data group
Number is the packet loss number carried in the confirmation packet.
6. the method as described in claim 1, which is characterized in that further include:
Determine that do not receive in preset duration receiving end transmission receives the currently data group to be sent for characterize
The data in current data group to be sent when confirmation packet, after sending redundancy encoding to receiving end again.
7. a kind of data transmission method characterized by comprising
Receiving end determine receive transmitting terminal send redundancy encoding after data group and be successfully decoded in the data group data when,
Generate the confirmation packet for being directed to the data group；
According to default redundancy coding parameters, the confirmation is wrapped and carries out redundancy encoding；
Confirmation packet after sending from redundancy encoding to the transmitting terminal；
Wherein, the corresponding redundancy coding parameters of each data group to be sent are identical or different；
Data group after redundancy encoding is transmitting terminal according to the corresponding redundancy coding parameters of current data group to be sent, to currently to
It sends the data in data group and carries out what redundancy encoding obtained；
When current data group to be sent is first data group that non-first data group or non-first time are sent, for each
Data group is sent, statistics sends the packet loss number for having sent data group every time, and determines and a packet loss event occurs；
Statistics loses the number that k number occurs according to the packet loss event of packet, wherein successively 0~N of value, N are in individual data group to k
The data packet number upper limit for being included, k is integer；
According to predetermined probabilities model, sends the packet loss number for having sent data group every time and lose k number according to the packet loss of packet
The number that event occurs, the probability P (0) for determining that the packet loss event for losing 0 data packet occurs arrive the packet loss for losing j data packet
Event occur probability P (j) and value, wherein j≤N, j are integer；
Determine the minimum value in all packet loss number j for meeting preset condition, wherein preset condition is that described and value is greater than or waits
In predetermined probabilities threshold value, the predetermined probabilities threshold value is for characterizing the probability that receiving end is successfully received data；
Determining minimum value is determined as the corresponding redundancy coding parameters of current data group to be sent.
8. the method for claim 7, which is characterized in that further include:
For each calculating cycle in preset number calculating cycle, according to the data packet in the data group after redundancy encoding
Number, calculates the difference of the data packet number in the data group and the data packet number in the data group being currently received, obtains pre-
Calculate period corresponding packet loss number；
It determines the maximum value in the corresponding packet loss number of preset number calculating cycle, which is determined as transmitting terminal single
Packet loss number after sending the data group；
Packet loss number after single to be sent to the data group, which is carried, is sent to transmitting terminal in the confirmation packet for the data group.
9. a kind of data transmission device characterized by comprising
Coding unit is used for according to the currently corresponding redundancy coding parameters of data group to be sent, in current data group to be sent
Data carry out redundancy encoding；
Transmission unit, for the data in the current data group to be sent after redundancy encoding to be sent to receiving end；
Wherein, the corresponding redundancy coding parameters of each data group to be sent are identical or different；
Further include:
Determination unit is first data that non-first data group or non-first time are sent for current data group to be sent
When group, data group is sent for each, statistics sends the packet loss number for having sent data group every time, and determines and occur once
Packet loss event；
Statistics loses the number that k number occurs according to the packet loss event of packet, wherein successively 0~N of value, N are in individual data group to k
The data packet number upper limit for being included, k is integer；
According to predetermined probabilities model, sends the packet loss number for having sent data group every time and lose k number according to the packet loss of packet
The number that event occurs, the probability P (0) for determining that the packet loss event for losing 0 data packet occurs arrive the packet loss for losing j data packet
Event occur probability P (j) and value, wherein j≤N, j are integer；
Determine the minimum value in all packet loss number j for meeting preset condition, wherein preset condition is that described and value is greater than or waits
In predetermined probabilities threshold value, the predetermined probabilities threshold value is for characterizing the probability that receiving end is successfully received data；
Determining minimum value is determined as the corresponding redundancy coding parameters of current data group to be sent.
10. device as claimed in claim 9, which is characterized in that further include:
Grouped element obtains several data groups to be sent for being grouped in the following ways to data to be sent:
Data to be sent are obtained from buffer area, the data volume of the data to be sent of the acquisition is not more than currently transmitted window；
According to the transmission sequence of the data to be sent of acquisition, according to Fibonacci sequence, to the data to be sent of the acquisition into
Row grouping, obtains several data groups to be sent.
11. device as claimed in claim 9, which is characterized in that the determination unit, it is current for determining in the following way
The corresponding redundancy coding parameters of data group to be sent:
Current data group to be sent is first data group and is to determine current pending when sending first data group for the first time
Sending the corresponding redundancy coding parameters of data group is 0.
12. device as claimed in claim 9, which is characterized in that the determining packet loss event for losing 0 data packet occurred
The probability P (j) that probability P (0) occurs to the packet loss event for losing j data packet and be worth, specifically include:
According to k number is lost according to the packet loss event number occurred of packet and the data packet number k of loss, determine that Poisson distribution is general
The value of parameter lambda in rate model；
Poisson distribution probabilistic model after being determined according to parameter lambda determines the probability P that the packet loss event for losing 0 data packet occurs
(0) probability P (j) occurred to the packet loss event for losing j data packet and be worth, wherein j≤N, j are integer；
Wherein,Preset condition are as follows:Wherein, PTHIndicate predetermined probabilities threshold value,It indicates
Described and value.
13. the device as described in claim 9 or 12, which is characterized in that the determination unit sends this in statistics every time and sent out
When sending the packet loss number of data group, it is specifically used for:
It sends after this has sent data group, starts this and sent the corresponding timer of data group；
Determine the timer then, and, when not receiving the confirmation packet of receiving end transmission, determine that this has sent losing for data group
Packet number is that this has sent the data packet number in data group；
Before determining the timer then, when receiving the confirmation packet of receiving end transmission, determine that this has sent the packet loss of data group
Number is the packet loss number carried in the confirmation packet.
14. device as claimed in claim 9, which is characterized in that the transmission unit is also used to:
Determine that do not receive in preset duration receiving end transmission receives the currently data group to be sent for characterize
The data in current data group to be sent when confirmation packet, after sending redundancy encoding to receiving end again.
15. a kind of data transmission device characterized by comprising
Generation unit, for determining the data group after receiving the redundancy encoding that transmitting terminal is sent and being successfully decoded in the data group
When data, the confirmation packet for being directed to the data group is generated；
Coding unit, for being wrapped to the confirmation and carrying out redundancy encoding according to redundancy coding parameters are preset；
Transmission unit, for the confirmation packet after sending redundancy encoding to the transmitting terminal；
Wherein, the corresponding redundancy coding parameters of each data group to be sent are identical or different；
Data group after redundancy encoding is transmitting terminal according to the corresponding redundancy coding parameters of current data group to be sent, to currently to
It sends the data in data group and carries out what redundancy encoding obtained；
When current data group to be sent is first data group that non-first data group or non-first time are sent, for each
Data group is sent, statistics sends the packet loss number for having sent data group every time, and determines and a packet loss event occurs；
Statistics loses the number that k number occurs according to the packet loss event of packet, wherein successively 0~N of value, N are in individual data group to k
The data packet number upper limit for being included, k is integer；
According to predetermined probabilities model, sends the packet loss number for having sent data group every time and lose k number according to the packet loss of packet
The number that event occurs, the probability P (0) for determining that the packet loss event for losing 0 data packet occurs arrive the packet loss for losing j data packet
Event occur probability P (j) and value, wherein j≤N, j are integer；
Determine the minimum value in all packet loss number j for meeting preset condition, wherein preset condition is that described and value is greater than or waits
In predetermined probabilities threshold value, the predetermined probabilities threshold value is for characterizing the probability that receiving end is successfully received data；
Determining minimum value is determined as the corresponding redundancy coding parameters of current data group to be sent.
16. device as claimed in claim 15, which is characterized in that the transmission unit is also used to:
For each calculating cycle in preset number calculating cycle, according to the data packet in the data group after redundancy encoding
Number, calculates the difference of the data packet number in the data group and the data packet number in the data group being currently received, obtains pre-
Calculate period corresponding packet loss number；
It determines the maximum value in the corresponding packet loss number of preset number calculating cycle, which is determined as transmitting terminal single
Packet loss number after sending the data group；
Packet loss number after single to be sent to the data group, which is carried, is sent to transmitting terminal in the confirmation packet for the data group.
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| CN108964844B (en) * | 2018-06-29 | 2021-08-31 | 东软医疗系统股份有限公司 | Data transmission method and device, electronic equipment and CT (computed tomography) rack |
| CN109525458B (en) * | 2018-11-20 | 2021-01-15 | 网易（杭州）网络有限公司 | Data transmission method, device, medium and electronic equipment |
| CN114424473A (en) * | 2019-09-13 | 2022-04-29 | 三菱电机株式会社 | Transmission device, reception device, communication system, control circuit, communication method, and storage medium |
| CN111629281B (en) * | 2020-04-13 | 2021-02-02 | 北京创享苑科技文化有限公司 | Online continuous inspection method based on network packet loss rate distribution in video transmission |
| CN114531210B (en) * | 2022-02-03 | 2024-01-26 | 百果园技术(新加坡)有限公司 | Data retransmission method, device, electronic equipment and storage medium |
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