CN117118569A - Method, device, computer equipment and storage medium for retransmitting data - Google Patents
Method, device, computer equipment and storage medium for retransmitting data Download PDFInfo
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Classifications
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/004—Arrangements for detecting or preventing errors in the information received by using forward error control
- H04L1/0041—Arrangements at the transmitter end
- H04L1/0042—Encoding specially adapted to other signal generation operation, e.g. in order to reduce transmit distortions, jitter, or to improve signal shape
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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
- H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
- H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
- H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
- H04L1/1812—Hybrid protocols; Hybrid automatic repeat request [HARQ]
- H04L1/1816—Hybrid protocols; Hybrid automatic repeat request [HARQ] with retransmission of the same, encoded, message
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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
- H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
- H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
- H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
- H04L1/1825—Adaptation of specific ARQ protocol parameters according to transmission conditions
Abstract
The disclosure relates to the technical field of data transmission, and discloses a method, a device, computer equipment and a storage medium for retransmitting data, wherein the method comprises the following steps: transmitting original data without redundancy to a receiving end; under the condition that the original data needs to be retransmitted, performing forward error correction coding on the original data to generate a redundant data packet corresponding to the original data; and sending the original data and the redundant data packet to the receiving end. According to the method and the device, under the condition that part of data packets are lost, even in a weak network scene of continuous packet loss, the receiving end can successfully decode and restore original data with high probability, and the transmitting end does not need to retransmit the original data again, so that the number of times of retransmitting the original data can be reduced, and the efficiency and throughput of data transmission are improved.
Description
Technical Field
The present disclosure relates to the field of data transmission technologies, and in particular, to a method, an apparatus, a computer device, and a storage medium for retransmitting data.
Background
An automatic repeat request (Automatic Repeat reQuest, ARQ) is a feedback control method used in data communication for ensuring reliability of data transmission. ARQ can be seen as a protocol for exchanging data packets between a sender and a receiver and for automatic retransmission when the data packets are lost or corrupted. ARQ is commonly used in the fields of wireless communication, internet transmission, and other data communication. The main advantage of ARQ is that it can ensure the reliability of data transmission. The ARQ can detect the loss or damage of the data packet and automatically retransmit the data packet, which is helpful to avoid errors in the data transmission process and improve the reliability and stability of the data transmission.
However, in the weak network scene such as continuous packet loss, the lost data needs to be retransmitted for many times based on the ARQ mechanism, and the efficiency is low.
Disclosure of Invention
In view of this, the present disclosure provides a method, apparatus, computer device and storage medium for retransmitting data, so as to solve the problem of low efficiency of retransmitting data.
In a first aspect, the present disclosure provides a method for retransmitting data, applied to a transmitting end, where the method includes:
transmitting original data without redundancy to a receiving end;
under the condition that the original data needs to be retransmitted, performing forward error correction coding on the original data to generate a redundant data packet corresponding to the original data;
and sending the original data and the redundant data packet to the receiving end.
In the method, under the condition that the original data needs to be retransmitted, forward error correction coding is carried out on the original data to generate a redundant data packet, and the original data and the redundant data packet are sent to a receiving end, so that retransmission of the original data is realized; in addition, under the condition that part of data packets are lost, even in a weak network scene of continuous packet loss, the receiving end can successfully decode and restore the original data with high probability, and the transmitting end does not need to retransmit the original data again, so that the number of times of retransmitting the original data can be reduced, and the efficiency and throughput of data transmission are improved.
In a second aspect, the present disclosure provides a method for retransmitting data, applied to a receiving end, where the method includes:
under the condition that original data sent by a sending end are not received, feeding back the original data to be retransmitted to the sending end;
receiving at least part of data packets in the original data and redundant data packets sent by the sending end, wherein the redundant data packets are data generated by performing forward error correction coding processing on the original data;
and performing forward error correction decoding processing on at least part of data packets in the original data and the redundant data packets to obtain the original data.
In a third aspect, the present disclosure provides an apparatus for retransmitting data, applied to a transmitting end, where the apparatus includes:
the sending module is used for sending the original data without redundancy to the receiving end;
the encoding module is used for carrying out forward error correction encoding processing on the original data under the condition that the original data needs to be retransmitted, and generating a redundant data packet corresponding to the original data;
the sending module is further configured to send the original data and the redundant data packet to the receiving end.
In a fourth aspect, the present disclosure provides an apparatus for retransmitting data, applied to a receiving end, where the apparatus includes:
The feedback module is used for feeding back the original data to be retransmitted to the sending end under the condition that the original data sent by the sending end is not received;
the receiving module is used for receiving at least part of data packets in the original data and redundant data packets sent by the sending end, wherein the redundant data packets are data generated by performing forward error correction coding processing on the original data;
and the decoding module is used for carrying out forward error correction decoding processing on at least part of data packets in the original data and the redundant data packets to obtain the original data.
In a fifth aspect, the present disclosure provides a computer device comprising: the memory and the processor are in communication connection, the memory stores computer instructions, and the processor executes the computer instructions to perform the data retransmission method of the first aspect or the second aspect.
In a sixth aspect, the present disclosure provides a computer readable storage medium having stored thereon computer instructions for causing a computer to perform the method of data retransmission of the first or second aspects described above.
Drawings
In order to more clearly illustrate the embodiments of the present disclosure or the prior art, the drawings that are required in the detailed description or the prior art will be briefly described, it will be apparent that the drawings in the following description are some embodiments of the present disclosure, and other drawings may be obtained according to the drawings without inventive effort for a person of ordinary skill in the art.
Fig. 1 is a schematic diagram of an application scenario of data retransmission;
fig. 2 is a flow chart of a method of sender data retransmission according to an embodiment of the present disclosure;
fig. 3 is a flow chart of a method of transmitting another data retransmission at a transmitting end according to an embodiment of the present disclosure;
fig. 4 is a flowchart of a method for transmitting yet another data retransmission according to an embodiment of the present disclosure;
fig. 5 is a flow chart of a method of receiving-side data retransmission according to an embodiment of the present disclosure;
fig. 6 is an overall flow diagram of a method of data retransmission in accordance with an embodiment of the present disclosure;
fig. 7 is a block diagram of an apparatus for transmitting-side data retransmission according to an embodiment of the present disclosure;
fig. 8 is a block diagram of an apparatus for receiving-side data retransmission according to an embodiment of the present disclosure;
Fig. 9 is a schematic diagram of a hardware structure of a computer device according to an embodiment of the present disclosure.
Detailed Description
For the purposes of making the objects, technical solutions and advantages of the embodiments of the present disclosure more apparent, the technical solutions of the embodiments of the present disclosure will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present disclosure, and it is apparent that the described embodiments are some embodiments of the present disclosure, but not all embodiments. Based on the embodiments in this disclosure, all other embodiments that a person skilled in the art would obtain without making any inventive effort are within the scope of protection of this disclosure.
Forward error correction coding (FEC, forward Error Correction) is a technique for controlling the packet loss rate in the network transmission process, and the recovery of lost data is achieved through redundant data, so that the packet loss rate is reduced. Compared with an ARQ mechanism after timeout waiting, the forward error correction coding can directly rely on redundant data to recover the data, does not need to wait for retransmission, and provides powerful guarantee for the instantaneity of data transmission. The forward error correction coding strategy is mainly divided into block codes and convolutional codes: (1) The Block code divides the data packets into different groups (blocks) in the forward error correction coding, and each group of data is independently coded. The symbol (n, k) is generally used to represent the packet, n represents the total number of data packets in the packet, k represents the number of original data packets in the code group, and r=n-k represents the number of redundant data packets; (2) The convolutional code, which is the coding of the information sequence to be transmitted by means of a shift register, differs from the block code mainly in that the convolutional code is a memory-coded code, i.e. the n inputs of the encoder are related not only to the k inputs of the current period but also to the m inputs preceding the memory. A general convolutional code is denoted as an (n, k, m) code, representing n outputs, k inputs, and m shift registers in the code.
At present, hybrid automatic retransmission can be realized by combining ARQ and FEC, and the hybrid automatic retransmission is used as a packet loss prevention strategy of a data packet; for example, acknowledgement retransmissions, flow control, congestion control, etc. mechanisms may be implemented at the application layer based on qic (Quick UDP Internet Connections, fast UDP network connection, a UDP-based modified low latency internet transport protocol). However, this combination method increases redundant data when retransmission is not needed, and occupies more bandwidth resources.
The embodiment of the disclosure provides a data retransmission method, which generates redundant data by using forward error correction coding when data packet loss occurs, so that more bandwidth resources are not occupied; in addition, the problem that repeated retransmission is needed when the packet is lost can be effectively avoided by utilizing the redundant data, and the retransmission efficiency can be improved.
Fig. 1 illustrates an application scenario of a method for data retransmission provided by the present disclosure. In this application scenario, a transmitting end 101, a receiving end 102, and a server 103 are included.
The sending end 101 and the receiving end 102 may be electronic devices with a data transmission function, and the electronic devices may be smart phones, tablet computers, smart watches, personal computers, and the like. In the data transmission process, if the two parties communicate, the number of the electronic devices is two; if the number of electronic devices is plural, the specific types and numbers of the transmitting end 101 and the receiving end 102 are not limited in this disclosure. The server 103 is a background server for providing data transmission functions for the sending end 101 and the receiving end 102, and may be a server, a server cluster formed by a plurality of servers, or a cloud computing center.
In one possible application scenario, the sending end 101 may send a real-time communication request, such as an audio/video call request, to the receiving end 102 through the server 103, after receiving the real-time communication request sent by the sending end 101, the receiving end 102 sends an acceptance response to the sending end 101 through the server 103, and the server 103 establishes a data channel of real-time communication between the sending end 101 and the receiving end 102, so that real-time data transmission is performed through the data channel.
In another possible application scenario, the receiving end 102 may send a non-real-time download request to the sending end 101 through the server 103, after the sending end 101 receives the download request sent by the receiving end 102, the sending end 101 may send an accept response to the receiving end 102 through the server 103, and send data required to be downloaded to the receiving end 102 through the server 103, so as to be received by the receiving end 102, thereby implementing downloading.
In accordance with the disclosed embodiments, a method embodiment of data retransmission is provided, it being noted that the steps illustrated in the flowcharts of the figures may be performed in a computer system, such as a set of computer executable instructions, and, although a logical order is illustrated in the flowcharts, in some cases, the steps illustrated or described may be performed in an order other than that illustrated herein.
In this embodiment, a method for retransmitting data is provided, which may be used at the transmitting end, and fig. 2 is a flowchart of a method for retransmitting data according to an embodiment of the disclosure, as shown in fig. 2, where the flowchart includes the following steps.
In step S201, original data to which redundancy is not added is transmitted to the receiving end.
In this embodiment, when the transmitting end needs to transmit data to the receiving end, under normal conditions, redundancy is not required to be added to the data, and the data is directly transmitted to the receiving end; in other words, the data transmitted to the receiving end is original data to which redundancy is not added, which is hereinafter simply referred to as original data. It will be appreciated that in the case of a good network between the transmitting end and the receiving end, communication between the two can be achieved by simply transmitting the original data.
The original data may include one data packet or may include a plurality of data packets, which is specific to the actual situation. For example, if only one data packet is lost currently in the process of transmitting the data packet from the transmitting end to the receiving end, the one data packet may be used as the original data; if there is a continuous packet loss, that is, a plurality of data packets are continuously lost, part or all of the data packets may be used as the original data.
In step S202, when the original data needs to be retransmitted, the original data is subjected to forward error correction encoding, and a redundant data packet corresponding to the original data is generated.
In this embodiment, after the transmitting end transmits the original data to the receiving end, if the receiving end successfully receives the original data, the transmitting end does not need to retransmit the original data, and then the transmitting end continues to transmit other data to the receiving end, or ends the transmission; if the receiving end does not receive the original data, the transmitting end needs to retransmit the original data to the receiving end.
Wherein it may be determined whether retransmission of the original data is required based on an ARQ mechanism. For example, after the transmitting end sends the original data to the receiving end, if the receiving end successfully receives the original data, the receiving end sends a corresponding ACK (Acknowledge character, acknowledgement character) to the transmitting end, and the transmitting end receives the ACK, so that it can be determined that retransmission is not needed. If the transmitting end does not receive the ACK sent by the receiving end within a specified time, the data can be considered to be lost, namely the original data needs to be retransmitted to the receiving end.
If the original data needs to be retransmitted to the receiving end, in this embodiment, the original data is subjected to forward error correction encoding, so that a redundant data packet capable of representing at least part of information of the original data can be generated, and the number of the redundant data packets can be one or a plurality of the redundant data packets.
For example, the original data may be divided into k original data packets, and the k original data packets are subjected to forward error correction encoding processing, so that corresponding redundant data packets may be generated, where the number of the redundant data packets may be 1 or multiple. For example, if the number of redundant data packets is r, n data packets (n=k+r) may be generated in total.
The forward error correction coding process may be implemented based on Reed-Solomon codes (Reed-Solomon codes), hamming codes (Hamming codes), or the like, which will not be described in detail in this embodiment.
Step S203, the original data and the redundant data packet are sent to the receiving end.
In this embodiment, after generating the redundant data packet, the original data may be sent again to the receiving end, and the redundant data packet corresponding to the original data may be sent. When the transmitting end transmits data to the receiving end, the transmitting end transmits the data by taking the data packet as a unit; the original data may include one or more original data packets, and the number of the redundant data packets may be one or more, and the transmitting end transmits all the original data packets and the redundant data packets to the receiving end in units of data packets. When the receiving end receives the original data packets and the redundant data packets, the current network is poor due to the current retransmission requirement, and the receiving end can not receive all the original data packets and the redundant data packets with high probability. If the transmitting end transmits n data packets to the receiving end, where the n data packets include k original data packets and r redundant data packets, based on the principle of forward error correction coding, the receiving end can restore to obtain the k original data packets based on any k or more data packets in the n data packets. In other words, even if the receiving end cannot receive all the data packets, as long as the number of the lost data packets is not more than r, the receiving end can restore the k original data packets required, thereby realizing successful transmission of the original data from the transmitting end to the receiving end.
In the method for retransmitting the data, under the condition that the original data needs to be retransmitted, forward error correction coding processing is carried out on the original data to generate a redundant data packet, and the original data and the redundant data packet are sent to a receiving end, so that retransmission of the original data is realized; in addition, under the condition that part of data packets are lost, even in a weak network scene of continuous packet loss, the receiving end can successfully decode and restore the original data with high probability, and the transmitting end does not need to retransmit the original data again, so that the number of times of retransmitting the original data can be reduced, and the efficiency and throughput of data transmission are improved.
In this embodiment, a method for retransmitting data is provided, which may be used at the transmitting end, and fig. 3 is a flowchart of a method for retransmitting data according to an embodiment of the disclosure, as shown in fig. 3, where the flowchart includes the following steps.
In step S301, original data to which redundancy is not added is transmitted to the receiving end.
Please refer to step S201 in the embodiment shown in fig. 2 in detail, which is not described herein.
In step S302, in the case where the original data needs to be retransmitted, forward error correction encoding is performed on the original data, so as to generate a redundant data packet corresponding to the original data.
Specifically, the above-described step S302 "performing forward error correction encoding processing on the original data, generating the redundant data packet corresponding to the original data" may include the following steps S3021 to S3022.
In step S3021, the number of redundancies applicable to the current network state is determined.
When performing forward error correction coding processing on the original data, a plurality of redundant data packets need to be determined, namely the number of redundancies of the redundant data packets need to be determined. In this embodiment, the current network state between the transmitting end and the receiving end is determined, and the appropriate redundancy number is determined based on the current network state, so as to reduce the retransmission times as much as possible.
The better the current network state is, the less likely the data loss is when the original data packet and the redundant data packet are sent to the receiving end later, so that fewer redundant data packets are used; the worse the current network state, the more likely the data is lost when the original data packet and the redundant data packet are sent to the receiving end later, so that more redundant data packets are needed to avoid multiple retransmissions as much as possible.
In some alternative embodiments, the current network state is represented by a packet loss rate and a packet loss number; in other words, the current network state includes the packet loss rate and the number of packets lost. The above-described step S3021 of determining the redundancy number applicable to the current network state may specifically include the following step a1.
Step a1, determining the redundancy number according to the packet loss rate and the packet loss number; wherein, the redundant number and the packet loss rate are in positive correlation.
In this embodiment, when the original data needs to be retransmitted, the current packet loss rate and the current packet loss number are determined. The sending end may count the sending condition of the data packet in a period of time, for example, count the sending condition of the data packet in a period of time before the current time, further determine the number of dropped packets in the period of time, and use the proportion of the number of dropped packets to the total number of dropped packets in the period of time as the packet loss rate.
The higher the packet loss rate, the worse the current network state is, the larger the required redundancy number is, namely, the positive correlation relationship between the redundancy number and the packet loss rate is obtained. Similarly, the more the number of lost packets, the worse the current network state is, the larger the required redundancy number is, namely, the positive correlation between the redundancy number and the number of lost packets is also obtained. The redundancy number is determined based on the packet loss rate and the packet loss number, so that when the transmitting end retransmits the original data and the redundancy data packet, the receiving end can decode the original data as much as possible to obtain the required original data, and the retransmission times are reduced.
In some optional embodiments, when the packet loss rate is greater than the first packet loss rate threshold and the packet loss number is greater than the first packet loss number threshold, the redundant number is in an exponential relationship with positive correlation with the packet loss rate and the packet loss number; and under the condition that the packet loss rate is smaller than the second packet loss rate threshold value and the packet loss number is smaller than the second packet loss number threshold value, the redundant number, the packet loss rate and the packet loss number are in a positive correlation linear relation. The first packet loss rate threshold is greater than or equal to the second packet loss rate threshold, and the first packet loss number threshold is greater than or equal to the second packet loss number threshold.
In this embodiment, an exponential function may be used to represent the relationship between the redundancy number and the packet loss rate, and the packet loss number, that is, the relationship between the redundancy number and the packet loss rate, and the packet loss number are all directly related exponential relationships. However, under the condition of smaller packet loss rate or smaller number of packet loss, the redundancy number determined based on the exponential relationship is difficult to accurately represent the change of the packet loss rate and the packet loss number due to smaller change rate of the exponential function; for example, when the packet loss rate or the number of packet losses changes, the determined redundancy number is unchanged. In order to accurately represent the relation between the packet loss rate, the packet loss number and the redundancy number, under the condition that the packet loss rate and the packet loss number are small, a linear function is adopted to represent the relation between the redundancy number and the packet loss rate and the packet loss number.
Specifically, if the packet loss rate is greater than the first packet loss rate threshold, and the packet loss number is greater than the first packet loss number threshold, both the packet loss rate and the packet loss number are greater, and the change rate of the exponential function is also greater, at this time, the relationship between the redundancy number and the packet loss rate and the packet loss number is represented by the exponential function, and the change of the packet loss rate and the packet loss number can be accurately reflected by different redundancy numbers. If the packet loss rate is smaller than the second packet loss rate threshold, and the packet loss number is smaller than the second packet loss number threshold, the packet loss rate and the packet loss number are smaller, and in the partial self-localization, the change rate of the linear function of the positive correlation is necessarily larger than the change rate of the exponential function of the positive correlation, so that the relationship between the redundancy number and the packet loss rate and the packet loss number is represented by the linear function, namely, the relationship between the redundancy number and the packet loss rate and the packet loss number is the linear relationship of the positive correlation, and the change of the packet loss number along with the change of the packet loss rate and the packet loss number can be better represented.
The first packet loss rate threshold, the second packet loss rate threshold, the first packet loss number threshold and the second packet loss number threshold can be preset. In general, the first packet loss rate threshold is greater than the second packet loss rate threshold, and the first packet loss number threshold is greater than the second packet loss number threshold.
In other cases, for example, the packet loss rate is between the first packet loss rate threshold and the second packet loss rate threshold, or the packet loss number is between the first packet loss rate threshold and the second packet loss rate threshold, or the packet loss rate is greater than the first packet loss rate threshold but the packet loss number is less than the first packet loss rate threshold, or the packet loss rate is less than the second packet loss rate threshold but the packet loss number is greater than the second packet loss rate threshold, or the redundant number may be in a linear relationship with the packet loss rate and the packet loss number, or may be in an exponential relationship, which is not limited in this embodiment.
In step S3022, forward error correction encoding is performed on the original data to generate redundant data packets with redundant numbers.
In this embodiment, after determining the number of redundancies, when performing forward error correction encoding processing on the original data, a redundant data packet of the number of redundancies is generated. For example, if the redundancy number is r, forward error correction encoding processing is performed on the original data, so as to generate r redundancy data packets.
Step S303, the original data and the redundant data packet are sent to the receiving end.
Please refer to step S203 in the embodiment shown in fig. 2 in detail, which is not described herein.
According to the data retransmission method provided by the embodiment, the redundancy number is determined based on the current network state, for example, the redundancy number is determined based on the packet loss rate and the packet loss number, and the redundancy data packets with proper quantity can be sent to the receiving end.
In this embodiment, a method for retransmitting data is provided, which may be used at the transmitting end, and fig. 4 is a flowchart of a method for retransmitting data according to an embodiment of the disclosure, as shown in fig. 4, where the flowchart includes the following steps.
In step S401, original data to which redundancy is not added is transmitted to the receiving end.
Please refer to step S201 in the embodiment shown in fig. 2 in detail, which is not described herein.
In step S402, in the case where the original data needs to be retransmitted, forward error correction encoding is performed on the original data, so as to generate a redundant data packet corresponding to the original data.
Please refer to step S202 in the embodiment shown in fig. 2 or step S302 in the embodiment shown in fig. 3, which will not be described herein.
Step S403, the original data and the redundant data packet are sent to the receiving end.
Specifically, the above-described step S403 "transmitting the original data and the redundant data packet to the receiving end" may include the following steps S4031 to S4032.
In step S4031, a transmission time corresponding to the redundant data packet is determined.
When transmitting data based on FEC technology, the original data and the redundant data are generally transmitted simultaneously. In this embodiment, the redundant data packet is generated when the data needs to be retransmitted, and the original data is the data needing to be retransmitted; in this case, the network state generally has a problem, and at this time, the original data and the redundant data packets are retransmitted in a short time, so that a problem of packet loss due to network congestion is more likely to occur, and it is difficult for the receiving end to receive a sufficient number of data packets. In this embodiment, a transmission time is set for the redundant data packet, and the redundant data packet is transmitted when the transmission time is reached, so as to improve the possibility that the receiving end receives the redundant data packet as much as possible.
If a plurality of redundant data packets are generated, the transmission time may be set for each redundant data packet, or the same transmission time may be set for at least a part of the redundant data packets, which may be specific to the actual situation.
In some alternative embodiments, the step S4031 "determining the transmission time corresponding to the redundant data packet" may include the following step b1 or step b2.
And b1, determining the transmission time corresponding to the redundant data packet according to the packet loss rate and/or the continuous packet loss time interval. The positive correlation is formed between the packet loss rate and the transmission interval, and the negative correlation is formed between the continuous packet loss time interval and the transmission interval; the transmission interval is a time interval between the transmission time and the current time.
In this embodiment, the transmission time of the redundant data packet may be determined according to the packet loss rate. The smaller the packet loss rate is, the more the redundant data packet is sent to the receiving end in a short time, the receiving end can also receive the redundant data packet with high probability, so that the redundant data packet can be sent after a short time. In this embodiment, the time interval between the transmission time and the current time is referred to as a "transmission interval", and it can be understood that the smaller the packet loss rate is, the shorter the transmission interval may be, and the positive correlation between the packet loss rate and the transmission interval is obtained.
Alternatively, the transmission time of the redundant data packet may be determined according to the continuous packet loss time interval. The larger the continuous packet loss time interval is, the more probability that the redundant data packet is not jammed is indicated to be sent to the receiving end after that, and the redundant data packet can be sent at the moment. For example, if the consecutive packet loss time interval exceeds a certain value (e.g., 50 ms), the redundant packet may be immediately transmitted to the receiving end.
It can be understood that determining the transmission time of the redundant data packet based on the continuous packet loss time interval has a certain limitation, if the continuous packet loss time interval is too large (for example, exceeds 1 s), it indicates that the current network is not available, and it is not needed to transmit data to the receiving end at present, and the network state can be determined again after waiting for a period of time until the network state can realize data transmission.
In this embodiment, the transmission time corresponding to the redundant data packet may be determined comprehensively by combining the packet loss rate and the continuous packet loss time interval, which will not be described in detail herein.
And b2, randomly setting the transmission time corresponding to the redundant data packet in the transmission period.
In this embodiment, a transmission period for transmitting the redundant data packet may be determined, and the transmission period may be, for example, round-Trip Time (RTT), or an appropriate transmission period may be determined based on the current network state, which is not limited in this embodiment. In the transmission period, the transmission time of the redundant data packets is set in a random mode, and particularly when a plurality of redundant data packets exist, the redundant data packets are randomly transmitted to the receiving end by setting the random transmission time, so that part of the redundant data packets are successfully transmitted to the receiving end with high probability, and the receiving end can realize forward error correction decoding.
If multiple redundant data packets are simultaneously sent to the receiving end, congestion is easy to occur, and all the redundant data packets may be lost due to network fluctuation between the sending end and the receiving end. In this embodiment, the random transmission time is set for the redundant data packets by using the characteristic of random network fluctuation, so that the situation that all the redundant data packets are lost is avoided to a great extent while the redundant data packets are scattered and transmitted, and the receiving end can receive at least part of the redundant data packets, thereby improving the possibility that the receiving end can realize forward error correction decoding.
Alternatively, the above step b2 "randomly setting the transmission time corresponding to the redundant data packet in the transmission period" may include the following steps b21 to b22.
Step b21, determining the redundancy number applicable to the current network state.
The process of determining the number of redundancies in this embodiment may be similar to the process of determining the number of redundancies in step S3021 in the embodiment shown in fig. 3, and will not be described here.
And step b22, dividing the transmission period into redundant time periods, and randomly selecting one time from each time period as the transmission time corresponding to the redundant data packet.
In this embodiment, the transmission period is divided according to the number of redundancies, so that the transmission period is divided into a plurality of time periods, and a time is randomly selected from each time period as the transmission time, so that the transmission time of different redundancy data packets is dispersed as much as possible, and the problem that the transmission times of a plurality of redundancy data packets are similar is effectively avoided.
For example, if the transmission period is 100ms, the redundancy number is 5, that is, 5 redundant data packets need to be transmitted to the receiving end. In this embodiment, the transmission period is divided into time periods with redundancy number, that is, 100ms is divided into 5 time periods, each time period corresponds to 20ms therein, and then one time is randomly selected from the 5 time periods as the transmission time, that is, one time is randomly selected from 1ms to 20ms as the transmission time of the first redundancy data packet, one time is randomly selected from 21ms to 40ms as the transmission time of the second redundancy data packet, and so on.
Step S4032, the original data is sent to the receiving end, and the redundant data packet is sent to the receiving end according to the sending time.
In this embodiment, the original data may be sent to the receiving end in a conventional manner, for example, when retransmission is required, the original data may be sent to the receiving end immediately. Then, redundant data packets are sent according to the sending time; for example, if there are a plurality of redundant data packets, the redundant data packets may be sequentially transmitted at the transmission time of the redundant data packets.
It can be understood that the sending time of the redundant data packet can be determined first, and then the original data is sent to the receiving end; or, the original data may be sent to the receiving end first, and the execution sequence of the two may not be limited in this embodiment when determining the sending time of the redundant data packet.
According to the data retransmission method provided by the embodiment, the redundant data packet is sent to the receiving end at a proper sending time, so that the possibility of the receiving end receiving the redundant data packet can be improved as much as possible, the receiving end has a higher probability of obtaining the original data through forward error correction decoding and restoring, and retransmission times are reduced as much as possible.
In this embodiment, a method for retransmitting data is provided, which may be used at the receiving end described above, and fig. 5 is a flowchart of a method for retransmitting data according to an embodiment of the disclosure, as shown in fig. 5, where the flowchart includes the following steps.
In step S501, in the case where the original data sent by the sender is not received, the sender is fed back that the original data needs to be retransmitted.
The receiving end can detect whether the data is lost in real time in the process of receiving the data sent by the sending end, and when the data is lost, the lost data is called as original data, the receiving end does not receive the original data sent by the sending end, and informs the sending end that the original data needs to be retransmitted. For example, if the data packets sent by the sending end have continuous sequence numbers, and the receiving end receives the data packets with discontinuous sequence numbers, it can be stated that the receiving end does not receive the data with intermediate sequence numbers, and at this time, the sending end needs to retransmit.
The receiving end feeds back to the transmitting end that the original data needs to be retransmitted, and can directly send a message of which original data needs to be retransmitted to the transmitting end, but the message may not be sent to the transmitting end because the network state is generally poor when the retransmission is needed. In general, the receiving end may indirectly feed back to the transmitting end that the original data needs to be retransmitted.
For example, based on the ARQ mechanism, the receiving end may send only the ACK of the received data to the transmitting end, and if the receiving end does not receive the original data, the receiving end will not send a message indicating that the original data has been received to the transmitting end within a specified time, for example, will not send the ACK of the original data to the transmitting end; accordingly, the sending end does not receive the ACK corresponding to the original data sent by the receiving end in the specified time, and the original data can be determined to be lost, so that the original data is successfully fed back to the sending end and needs to be retransmitted.
Or if the transmitting end sequentially transmits the data 1, the data 2 and the data 3 to the receiving end, and the serial numbers of the three data are continuous; if the receiving end only receives the data 1 and the data 3, namely the data 2 is lost, the receiving end feeds back the ACK of the data 1 to the transmitting end when receiving the data 1, and feeds back the ACK of the data 3 to the transmitting end when receiving the data 3. Accordingly, the transmitting end only receives the ACKs of the data 1 and the data 3, i.e. does not receive the ACK of the data 2. Therefore, the receiving end can also realize feedback to the sending end that the original data needs to be retransmitted through ACK of other data after sending the original data to the sending end. In addition, the receiving end may also indirectly feed back to the transmitting end that the original data needs to be retransmitted in other manners, which is not limited in this embodiment.
Step S502, receiving at least part of the original data and the redundant data packet sent by the sending end, where the redundant data packet is generated by performing forward error correction coding processing on the original data.
In this embodiment, after the receiving end feeds back to the transmitting end that the original data needs to be retransmitted, the transmitting end retransmits the original data to the receiving end. Specifically, as shown in step S202 and step S203 in the embodiment shown in fig. 2, the transmitting end performs forward error correction encoding processing on the original data to generate a redundant data packet, and then sends the original data and the generated redundant data packet to the receiving end. Accordingly, the receiving end can receive the original data and the redundant data packet sent by the sending end.
Wherein the receiving end receives at least part of the data packets, and the receiving end can receive the data packets according to the current network state. For example, if the current network state is good, the receiving end may receive all data, i.e. all original data and all redundant data packets; if the current network state is poor, it may be possible to only receive a portion of the packets, such as a portion of the original data and/or a portion of the redundant packets.
In step S503, forward error correction decoding is performed on at least some of the original data and the redundant data packets, so as to obtain the original data.
In this embodiment, the redundant data packet is obtained based on the forward error correction coding, so that the receiving end can restore to obtain the complete original data by performing the forward error correction decoding processing on the received partial data packet even if the receiving end only receives the original data and the partial data in the redundant data packet. For example, the original data includes three original data packets A, B, C, the transmitting end generates two redundant data packets D, E, that is, the number k=3 of the original data packets and the number r=2 of the redundant data packets, so that the receiving end can restore to obtain three original data packets A, B, C as long as the receiving end can receive at least three data packets therein; for example, the receiving end receives the data packet A, B, D, or the data packet A, D, E, etc., and can restore to obtain three original data packets A, B, C.
It will be appreciated that if the receiving end receives all of the original data, the forward error correction decoding process is not required even if there is a loss of the redundant data packet. In addition, if the number of the data packets received by the receiving end does not meet the requirement of forward error correction decoding, the original data cannot be decoded yet, and the sending end is required to retransmit the original data again until the data packets received by the receiving end can be restored to obtain all the original data.
According to the data retransmission method provided by the embodiment, under the condition that original data needs to be retransmitted, the sending end sends the original data and the redundant data packet generated based on forward error correction coding processing to the receiving end, the receiving end can successfully restore to obtain complete original data even if partial data is lost, and the sending end does not need to retransmit the original data again, so that the number of times of retransmitting the original data by the sending end can be reduced, and the data transmission efficiency and throughput are improved.
In this embodiment, a method for retransmitting data is provided, so that a transmitting end transmits original data to a receiving end. Fig. 6 is a flowchart of a method of data retransmission according to an embodiment of the present disclosure, as shown in fig. 6, including the following steps.
In step S601, the transmitting end transmits original data to which redundancy is not added to the receiving end.
The details can be referred to step S201 in the embodiment shown in fig. 2, and will not be described herein.
In step S602, the receiving end feeds back to the sending end that the original data sent by the sending end needs to be retransmitted if the original data is not received.
The details can be referred to in step S501 in the embodiment shown in fig. 5, and will not be described herein.
In step S603, the transmitting end determines that the original data needs to be retransmitted, and performs forward error correction encoding processing on the original data to generate a redundant data packet corresponding to the original data.
The details can be referred to step S202 in the embodiment shown in fig. 2, and will not be described herein.
In step S604, the transmitting end transmits the original data and the redundant data packet to the receiving end.
The details can be referred to step S203 in the embodiment shown in fig. 2, and will not be described herein.
In step S605, the receiving end receives at least part of the original data and the redundant data packets sent by the sending end.
The details can be referred to step S502 in the embodiment shown in fig. 5, and will not be described herein.
In step S606, the receiving end determines whether packet loss occurs. In case of packet loss, step S607 is performed, otherwise step S608 is performed.
When the transmitting end transmits the original data and the redundant data packet, all the original data and the redundant data packet are one packet, the original data packet and the redundant data packet in the original data have different and continuous serial numbers, and after the receiving end receives the data packet, the receiving end can determine whether the data packet is lost or not through the continuity of the serial numbers.
In step S607, the receiving end performs forward error correction decoding processing on the received data packet to obtain the original data.
In step S608, the receiving end directly extracts the original data from the received data packet.
It can be understood that when the receiving end determines that packet loss occurs, if the lost data packet is a redundant data packet, the original data packet may also be directly extracted from the received data packet. Therefore, the step S606 may specifically be: the receiving end judges whether the original data packet is lost or not. If the original data packet is lost, step S607 is executed, otherwise step S608 is executed.
The embodiment also provides a device for retransmitting data, which is used for implementing the foregoing embodiments and preferred embodiments, and is not described in detail. As used below, the term "module" may be a combination of software and/or hardware that implements a predetermined function. While the means described in the following embodiments are preferably implemented in software, implementation in hardware, or a combination of software and hardware, is also possible and contemplated.
The embodiment provides a data retransmission apparatus, which is applied to a transmitting end, as shown in fig. 7, and includes:
a sending module 701, configured to send original data to which redundancy is not added to a receiving end;
the encoding module 702 is configured to perform forward error correction encoding processing on the original data, and generate a redundant data packet corresponding to the original data when the original data needs to be retransmitted;
the sending module 701 is further configured to send the original data and the redundant data packet to the receiving end.
In some alternative embodiments, the encoding module 702 performs a forward error correction encoding process on the original data, and generates a redundant data packet corresponding to the original data, including:
Determining the redundancy number applicable to the current network state;
and performing forward error correction coding processing on the original data to generate redundant data packets with the redundant number.
In some optional embodiments, the current network state includes a packet loss rate and a packet loss number;
the encoding module 702 determines the number of redundancies applicable to the current network state, including:
determining the redundancy number according to the packet loss rate and the packet loss number; and the redundant number, the packet loss rate and the packet loss number are in positive correlation.
In some optional embodiments, when the packet loss rate is greater than a first packet loss rate threshold and the packet loss number is greater than a first packet loss number threshold, the redundant number and the packet loss rate and the packet loss number are both in an exponential relationship of positive correlation;
under the condition that the packet loss rate is smaller than a second packet loss rate threshold value and the packet loss number is smaller than a second packet loss number threshold value, the redundant number and the packet loss rate and the packet loss number are in a positive correlation linear relation;
the first packet loss rate threshold is greater than or equal to the second packet loss rate threshold, and the first packet loss number threshold is greater than or equal to the second packet loss number threshold.
In some alternative embodiments, the sending module 701 sends the original data and the redundant data packet to the receiving end, including:
determining the sending time corresponding to the redundant data packet;
and sending the original data to the receiving end, and sending the redundant data packet to the receiving end according to the sending time.
In some optional embodiments, the determining, by the sending module 701, a sending time corresponding to the redundant data packet includes:
determining the sending time corresponding to the redundant data packet according to the packet loss rate and/or the continuous packet loss time interval;
wherein, the positive correlation relationship is between the packet loss rate and the sending interval, and the negative correlation relationship is between the continuous packet loss time interval and the sending interval; the transmission interval is a time interval between the transmission time and a current time.
In some optional embodiments, the determining, by the sending module 701, a sending time corresponding to the redundant data packet includes:
and randomly setting the transmission time corresponding to the redundant data packet in the transmission period.
In some optional embodiments, the sending module 701 randomly sets a sending time corresponding to the redundant data packet in a sending period, including:
Determining the redundancy number applicable to the current network state;
dividing the transmission period into time periods of the redundancy number, and randomly selecting one time from each time period as the transmission time corresponding to the redundancy data packet.
The embodiment provides a data retransmission apparatus, which is applied to a receiving end, as shown in fig. 8, and includes:
a feedback module 801, configured to, when original data sent by a sender is not received, feed back to the sender that the original data needs to be retransmitted;
a receiving module 802, configured to receive at least a portion of data packets in the original data and a redundant data packet sent by the sending end, where the redundant data packet is data generated by performing forward error correction coding processing on the original data;
and the decoding module 803 is configured to perform forward error correction decoding processing on at least part of the data packets in the original data and the redundant data packets, so as to obtain the original data.
Further functional descriptions of the above respective modules and units are the same as those of the above corresponding embodiments, and are not repeated here.
The means for data retransmission in this embodiment are presented in the form of functional units, here referred to as ASIC (Application Specific Integrated Circuit ) circuits, processors and memories executing one or more software or fixed programs, and/or other devices that can provide the above described functionality.
The embodiment of the disclosure also provides a computer device, which is provided with the data retransmission device shown in fig. 7 or fig. 8.
Referring to fig. 9, fig. 9 is a schematic structural diagram of a computer device according to an alternative embodiment of the disclosure, as shown in fig. 9, the computer device includes: one or more processors 10, memory 20, and interfaces for connecting the various components, including high-speed interfaces and low-speed interfaces. The various components are communicatively coupled to each other using different buses and may be mounted on a common motherboard or in other manners as desired. The processor may process instructions executing within the computer device, including instructions stored in or on memory to display graphical information of the GUI on an external input/output device, such as a display device coupled to the interface. In some alternative embodiments, multiple processors and/or multiple buses may be used, if desired, along with multiple memories and multiple memories. Also, multiple computer devices may be connected, each providing a portion of the necessary operations (e.g., as a server array, a set of blade servers, or a multiprocessor system). One processor 10 is illustrated in fig. 9.
The processor 10 may be a central processor, a network processor, or a combination thereof. The processor 10 may further include a hardware chip, among others. The hardware chip may be an application specific integrated circuit, a programmable logic device, or a combination thereof. The programmable logic device may be a complex programmable logic device, a field programmable gate array, a general-purpose array logic, or any combination thereof.
Wherein the memory 20 stores instructions executable by the at least one processor 10 to cause the at least one processor 10 to perform the methods shown in implementing the above embodiments.
The memory 20 may include a storage program area that may store an operating system, at least one application program required for functions, and a storage data area; the storage data area may store data created according to the use of the computer device, etc. In addition, the memory 20 may include high-speed random access memory, and may also include non-transitory memory, such as at least one magnetic disk storage device, flash memory device, or other non-transitory solid-state storage device. In some alternative embodiments, memory 20 may optionally include memory located remotely from processor 10, which may be connected to the computer device via a network. Examples of such networks include, but are not limited to, the internet, intranets, local area networks, mobile communication networks, and combinations thereof.
Memory 20 may include volatile memory, such as random access memory; the memory may also include non-volatile memory, such as flash memory, hard disk, or solid state disk; the memory 20 may also comprise a combination of the above types of memories.
The computer device further comprises input means 30 and output means 40. The processor 10, memory 20, input device 30, and output device 40 may be connected by a bus or other means, for example by a bus connection in fig. 9.
The input device 30 may receive input numeric or character information and generate key signal inputs related to user settings and function control of the computer apparatus, such as a touch screen, a keypad, a mouse, a trackpad, a touchpad, a pointer stick, one or more mouse buttons, a trackball, a joystick, and the like. The output means 40 may include a display device, auxiliary lighting means (e.g., LEDs), tactile feedback means (e.g., vibration motors), and the like. Such display devices include, but are not limited to, liquid crystal displays, light emitting diodes, displays and plasma displays. In some alternative implementations, the display device may be a touch screen.
The presently disclosed embodiments also provide a computer readable storage medium, and the methods described above according to the presently disclosed embodiments may be implemented in hardware, firmware, or as recordable storage medium, or as computer code downloaded over a network that is originally stored in a remote storage medium or a non-transitory machine-readable storage medium and is to be stored in a local storage medium, such that the methods described herein may be stored on such software processes on a storage medium using a general purpose computer, special purpose processor, or programmable or dedicated hardware. The storage medium can be a magnetic disk, an optical disk, a read-only memory, a random access memory, a flash memory, a hard disk, a solid state disk or the like; further, the storage medium may also comprise a combination of memories of the kind described above. It will be appreciated that a computer, processor, microprocessor controller or programmable hardware includes a storage element that can store or receive software or computer code that, when accessed and executed by the computer, processor or hardware, implements the methods illustrated by the above embodiments.
Although embodiments of the present disclosure have been described in connection with the accompanying drawings, various modifications and variations may be made by those skilled in the art without departing from the spirit and scope of the disclosure, and such modifications and variations are within the scope defined by the appended claims.
Claims (13)
1. A method for retransmitting data, the method being applied to a transmitting end, the method comprising:
transmitting original data without redundancy to a receiving end;
under the condition that the original data needs to be retransmitted, performing forward error correction coding on the original data to generate a redundant data packet corresponding to the original data;
and sending the original data and the redundant data packet to the receiving end.
2. The method of claim 1, wherein said performing forward error correction encoding on said original data to generate redundant data packets corresponding to said original data comprises:
determining the redundancy number applicable to the current network state;
and performing forward error correction coding processing on the original data to generate redundant data packets with the redundant number.
3. The method of claim 2, wherein the current network state includes a packet loss rate and a packet loss number;
the determining the redundancy number applicable to the current network state comprises the following steps:
determining the redundancy number according to the packet loss rate and the packet loss number; and the redundant number, the packet loss rate and the packet loss number are in positive correlation.
4. The method of claim 3, wherein the step of,
when the packet loss rate is greater than a first packet loss rate threshold value and the packet loss number is greater than a first packet loss number threshold value, the redundant number and the packet loss rate and the packet loss number are both in a positive correlation exponential relationship;
under the condition that the packet loss rate is smaller than a second packet loss rate threshold value and the packet loss number is smaller than a second packet loss number threshold value, the redundant number and the packet loss rate and the packet loss number are in a positive correlation linear relation;
the first packet loss rate threshold is greater than or equal to the second packet loss rate threshold, and the first packet loss number threshold is greater than or equal to the second packet loss number threshold.
5. The method of claim 1, wherein said sending the original data and the redundant data packet to the receiving end comprises:
determining the sending time corresponding to the redundant data packet;
and sending the original data to the receiving end, and sending the redundant data packet to the receiving end according to the sending time.
6. The method of claim 5, wherein the determining the transmission time corresponding to the redundant data packet comprises:
Determining the sending time corresponding to the redundant data packet according to the packet loss rate and/or the continuous packet loss time interval;
wherein, the positive correlation relationship is between the packet loss rate and the sending interval, and the negative correlation relationship is between the continuous packet loss time interval and the sending interval; the transmission interval is a time interval between the transmission time and a current time.
7. The method of claim 5, wherein the determining the transmission time corresponding to the redundant data packet comprises:
and randomly setting the transmission time corresponding to the redundant data packet in the transmission period.
8. The method of claim 7, wherein the randomly setting the transmission time corresponding to the redundant data packet in the transmission period includes:
determining the redundancy number applicable to the current network state;
dividing the transmission period into time periods of the redundancy number, and randomly selecting one time from each time period as the transmission time corresponding to the redundancy data packet.
9. A method for retransmitting data, the method being applied to a receiving end, the method comprising:
under the condition that original data sent by a sending end are not received, feeding back the original data to be retransmitted to the sending end;
Receiving at least part of data packets in the original data and redundant data packets sent by the sending end, wherein the redundant data packets are data generated by performing forward error correction coding processing on the original data;
and performing forward error correction decoding processing on at least part of data packets in the original data and the redundant data packets to obtain the original data.
10. A device for retransmitting data, the device being applied to a transmitting end, the device comprising:
the sending module is used for sending the original data without redundancy to the receiving end;
the encoding module is used for carrying out forward error correction encoding processing on the original data under the condition that the original data needs to be retransmitted, and generating a redundant data packet corresponding to the original data;
the sending module is further configured to send the original data and the redundant data packet to the receiving end.
11. An apparatus for retransmitting data, the apparatus being applied to a receiving end, the apparatus comprising:
the feedback module is used for feeding back the original data to be retransmitted to the sending end under the condition that the original data sent by the sending end is not received;
the receiving module is used for receiving at least part of data packets in the original data and redundant data packets sent by the sending end, wherein the redundant data packets are data generated by performing forward error correction coding processing on the original data;
And the decoding module is used for carrying out forward error correction decoding processing on at least part of data packets in the original data and the redundant data packets to obtain the original data.
12. A computer device, comprising:
a memory and a processor in communication with each other, the memory having stored therein computer instructions, the processor executing the computer instructions to perform the method of data retransmission of any one of claims 1 to 8 or 9.
13. A computer readable storage medium having stored thereon computer instructions for causing a computer to perform the method of data retransmission according to any one of claims 1 to 8 or 9.
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