CN116132001A - Packet loss retransmission method - Google Patents
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- 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
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- H04L1/1809—Selective-repeat protocols
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- H—ELECTRICITY
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- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
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Abstract
The invention relates to the technical field of network communication, and discloses a packet loss retransmission method, which comprises the following steps: after receiving the data packet, the receiving end judges whether packet loss occurs; determining packet loss codes with packet loss, and finding corresponding packet loss data in a redundant channel to carry out packet loss recovery; when packet loss recovery cannot be performed, the receiving end sends NACK to the sending end; the transmitting end carries out packet loss retransmission on the data packet which can not be subjected to packet loss recovery; the transmitting end carries out packet loss retransmission on the data packet which can not be subjected to packet loss recovery, and the method comprises the following steps: determining packet loss codes of packet loss data; and finding out a corresponding data packet at the transmitting end to carry out packet loss retransmission. The invention can reduce the delay caused by retransmission, relieve network congestion and reduce retransmission efficiency.
Description
Technical Field
The invention relates to the technical field of network communication, in particular to a packet loss retransmission method.
Background
With the development of network data transmission technology, the speed of data transmission is faster and faster, but in the process of data transmission, the situation that data packets are lost, namely, packet loss, often occurs, and in the prior art, a method of retransmitting the lost data packets by a transmitting end is adopted to recover the lost data. The method comprises the steps of forming a packet loss group by the sequence numbers of the lost data packets, and then sending the packet loss group contained in a packet loss retransmission request back to a data sending end within a preset interval time to request to retransmit the lost data packets. If a lost packet is received later, it is removed from the packet loss array.
The realization steps of packet loss retransmission are as follows: the reception of RTP by the receiving end is a sister protocol of the real-time transport protocol (RTP). ) After the packet is received, whether packet loss occurs or not is judged, and if so, a retransmission request NACK (ACK: acknowledgement is a positive feedback, and a receiver replies a message to inform a sender after receiving data. NACK: negative Acknowledgement, a negative feedback, the receiver only notifies the sender when no data is received. ). It is a feedback packet based on RTCP (Real-time Transport Control Protocol or RTP Control Protocol or abbreviated RTCP). Wherein PID is the sequence number of the first lost packet, BLP is the information of the sequence numbers of other lost packets relative to PID. After receiving NACK, the transmitting end finds out the packet according to the required sequence number from the redundant channel and transmits the packet. After receiving the retransmission packet, the receiving end first recovers its original sequence number and then inserts it into the receiving queue.
The disadvantage of the above method is that if the preset interval time is smaller than the network delay time, the receiving end will make the next preset interval time when the receiving end has not received the data packet retransmitted by the data transmitting end, the receiving end will again request the transmitting end to retransmit the lost data packet, and in fact, the data transmitting end has retransmitted the lost data packet, but has not yet reached the receiving end due to network delay and other reasons. Because the retransmitted data packet may be lost, the data transmitting end cannot make any intelligent judgment and assumption, and each retransmission request needs to be responded and processed, which results in repeated transmission of the same retransmitted data packet for a plurality of times, thereby generating bandwidth waste and reducing retransmission efficiency.
Disclosure of Invention
The invention provides a packet loss retransmission method which can reduce delay caused by retransmission, relieve network congestion and reduce retransmission efficiency.
In order to achieve the above object, the present invention provides the following solutions: the invention provides a packet loss retransmission method, which comprises the following steps:
after receiving the data packet, the receiving end judges whether packet loss occurs;
determining packet loss codes with packet loss, and finding corresponding packet loss data in a redundant channel to carry out packet loss recovery;
when packet loss recovery cannot be performed, the receiving end sends NACK to the sending end;
the transmitting end carries out packet loss retransmission on the data packet which can not be subjected to packet loss recovery;
the transmitting end carries out packet loss retransmission on the data packet which can not be subjected to packet loss recovery, and the method comprises the following steps:
determining packet loss codes of packet loss data;
and finding out a corresponding data packet at the transmitting end to carry out packet loss retransmission.
In one embodiment, the determining whether packet loss occurs includes:
determining a preset redundant ACK frequency threshold based on the transmission condition of the data packet;
and when the number of redundant ACK exceeds a preset threshold value of the number of redundant ACK, judging that packet loss occurs.
In one embodiment, the determining the preset redundant ACK number threshold based on the transmission condition of the data packet includes:
determining the number of data packets sent by a sending end;
predicting the arrival sequence condition of the data packets received by the receiving end based on the number of the data packets;
classifying the arrival sequence condition of the data packet received by the receiving end, wherein the classification comprises: the data packets are not lost, the data packets arrive out of order and are not lost and the data packets arrive lost;
determining the probability of redundant ACK of different categories;
and inputting the probability of redundant ACK of different categories into a preset relation model, and obtaining a preset redundant ACK frequency threshold.
In one embodiment, the establishing of the deep learning model includes: defining an input layer and an output layer, selecting the probability of redundant ACK when a data packet is not lost, the probability of redundant ACK when the data packet is out of order to reach the non-lost state and the probability of redundant ACK when the data packet is lost to reach the non-lost state as input variables, and inputting dimension m=3; taking a preset redundancy ACK frequency threshold as an output variable, and outputting the dimension n=1;
and selecting the hidden layer number and the hidden layer unit number, adopting a single hidden layer, and determining the hidden layer node number to be 4.
In one embodiment, after carrying out packet loss retransmission on a data packet which cannot be subjected to packet loss recovery, a transmitting end recovers an original sequence number of retransmission packet loss data, and inserts the retransmission packet loss data into a receiving queue; the receiving queue is used for sequentially queuing the received data packets by the receiving end.
In one embodiment, when the transmitting end performs packet loss retransmission on the data packet that cannot be subjected to packet loss recovery, the method further includes:
determining the number of times of NACK received by a transmitting end;
and retransmitting the lost packet data based on a fast retransmission mechanism in retransmission timing time if the number of times of NACK received by the transmitting end is larger than a preset number of times.
In one embodiment, the receiving end periodically transmits the NACK.
In one embodiment, the method further comprises: acquiring an actual packet loss rate;
and setting early warning information based on the relation between the actual packet loss rate and the preset packet loss rate.
In one embodiment, a preset packet loss rate matrix P0 is preset, and p0= (P1, P2, P3) is set, where P1 is a first preset packet loss rate, P2 is a second preset packet loss rate, and P3 is a third preset packet loss rate, where P1 < P2 < P3;
presetting a preset early warning information matrix G0, and setting G0= (G1, G2 and G3), wherein G1 is first preset early warning information, G2 is second preset early warning information and G3 is third preset early warning information;
setting early warning information G according to the relation between the pressure P and each preset packet loss rate:
when P is smaller than P1, selecting the first preset early warning information G1 as early warning information G;
when P1 is less than or equal to P2, selecting the second preset early warning information G2 as early warning information G;
and when P2 is less than or equal to P3, selecting the third preset early warning information G3 as early warning information G.
The invention has the technical effects that: and the lost packet data is recovered and then retransmitted, so that the delay caused by retransmission is reduced, and the generation of bandwidth waste is avoided.
And finding out the corresponding data packet at the transmitting end through coding to carry out packet loss retransmission, thereby improving the retransmission efficiency.
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In order to more clearly illustrate the embodiments of the present invention or the technical solutions of the prior art, the drawings that are needed in the embodiments will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a flowchart of a packet loss retransmission method provided in an embodiment of the present invention;
fig. 2 is a flow chart of packet loss retransmission of a data packet which cannot be recovered by packet loss by a transmitting end provided by an embodiment of the present invention;
fig. 3 is a flowchart for determining whether packet loss occurs according to an embodiment of the present invention;
fig. 4 is a flowchart of determining a preset redundant ACK number threshold based on a transmission condition of a data packet according to an embodiment of the present invention.
Detailed Description
The following describes in further detail the embodiments of the present invention with reference to the drawings and examples. The following examples are illustrative of the invention and are not intended to limit the scope of the invention.
In the description of the present application, it should be understood that the terms "center," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like indicate orientations or positional relationships based on the orientation or positional relationships shown in the drawings, merely to facilitate description of the present application and simplify the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present application.
The terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present application, unless otherwise indicated, the meaning of "a plurality" is two or more.
In the description of the present application, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the terms in this application will be understood by those of ordinary skill in the art in a specific context.
With the development of internet technology and the enhancement of mobile device functions, real-time video communication is becoming a common means for people to communicate daily. The real-time video communication technology is a technology for carrying out real-time video communication through a network, and allows two or more people to use the network for carrying out real-time video communication, and the main application scenes comprise multi-person video conferences, video phones, remote medical treatment, online education and the like. However, in the data transmission process, the situation that the data packet is lost, namely the packet is lost, and the packet loss retransmission strategy adopted in the related technology can solve the packet loss problem in the UDP transmission to a certain extent, however, in some cases, the strategy can cause delay increase and network congestion, and is not suitable for occasions with higher requirements on real-time performance, such as real-time video communication.
As shown in fig. 1-2, this embodiment discloses a packet loss retransmission method, which includes:
step S1, after receiving a data packet, a receiving end judges whether packet loss occurs or not;
step S2, determining packet loss codes with packet loss, and finding corresponding packet loss data in a redundant channel to carry out packet loss recovery;
step S3, when packet loss recovery cannot be carried out, the receiving end sends NACK to the sending end;
step S4, the transmitting end carries out packet loss retransmission on the data packet which can not be subjected to packet loss recovery;
specifically, in step S4, the transmitting end performs packet loss retransmission on the data packet that cannot be recovered by packet loss, including:
step S41, determining packet loss codes of packet loss data;
step S42, find the correspondent data packet to carry on the packet loss retransmission in the sender.
It can be understood that in the above embodiment, after receiving the RTP packet, the receiving end determines whether packet loss occurs, determines packet loss encoding in which packet loss occurs, and finds corresponding packet loss data in a redundant channel (a redundant channel divided on a transmission bandwidth, and a redundant data packet is transmitted in the redundant channel) to perform packet loss recovery; when packet loss recovery cannot be performed, a retransmission request NACK is sent to an opposite terminal (namely a sending terminal); after receiving NACK, the transmitting end finds out the packet according to the required sequence number from the redundant channel and transmits the packet.
As shown in fig. 3, in some embodiments, the determining whether packet loss occurs includes:
step S11, determining a preset redundant ACK frequency threshold value based on the transmission condition of the data packet;
and step S12, when the number of redundant ACK exceeds a preset threshold value of the number of redundant ACK, judging that packet loss occurs.
It may be understood that in the above embodiment, the sending end sends the TCP packets in sequence, and since the TCP packets are encapsulated in the IP packets, the IP packets are out of order during transmission, which means that the TCP packets arrive at the receiving end in order, and the out of order will cause the receiving end to send redundant ACKs. Because the redundant ACKs may be sent out of order or due to packet loss, the number of redundant ACKs is a criterion for determining loss and a more accurate estimate is needed. And determining a preset redundant ACK time threshold based on the sending condition of the data packet, and improving the accuracy of the preset redundant ACK time threshold confirmation, thereby improving the accuracy of judging that the packet loss occurs.
As shown in fig. 4, in some specific embodiments, in step S11, the determining the preset redundant ACK number threshold based on the transmission condition of the data packet includes:
step S111, determining the number of data packets sent by a sending end;
step S112, predicting the arrival sequence condition of the data packets received by the receiving end based on the number of the data packets;
step S113, classifying the arrival sequence of the data packets received by the receiving end, where the classification includes: the data packets are not lost, the data packets arrive out of order and are not lost and the data packets arrive lost;
step S114, determining the probability of redundant ACK of different categories;
step S115, the probability of redundant ACK of different categories is input into a preset relation model, and a preset redundant ACK frequency threshold is obtained.
It will be appreciated that in the above embodiment, it is assumed that both communication parties are as follows: a is a transmitting end, B is a receiving end, the number of the data packet to be transmitted of A is N-1, N, N+1, N+2, and the transmitting sequence of A is N-1, N, N+1, N+2; assuming that the data packet N-1 arrives successfully first, if the data packet N is not lost, 6 situations of inconsistent arrival sequences exist, and if the data packet N is lost, 2 situations of inconsistent arrival sequences exist; in the case of no loss, there are 40% of the possible occurrences of 3 redundant ACKs, in the case of out-of-order, 2 redundant ACKs, and in the case of loss, 3 redundant ACKs. Based on the probability, the probability of redundant ACK of different categories is input into a preset relation model, and a preset redundant ACK frequency threshold is obtained, wherein the preset redundant ACK frequency threshold is 3, so that 3 redundant ACKs are selected as the threshold.
In some specific embodiments, the establishing of the deep learning model includes: defining an input layer and an output layer, selecting the probability of redundant ACK when a data packet is not lost, the probability of redundant ACK when the data packet is out of order to reach the non-lost state and the probability of redundant ACK when the data packet is lost to reach the non-lost state as input variables, and inputting dimension m=3; taking a preset redundancy ACK frequency threshold as an output variable, and outputting the dimension n=1;
and selecting the hidden layer number and the hidden layer unit number, adopting a single hidden layer, and determining the hidden layer node number to be 4.
It can be understood that in the above embodiment, by constructing the deep learning model, the optimal solution is searched at a high speed, so that the accuracy of determining the preset redundant ACK frequency threshold is improved, and the accuracy of determining that the packet loss occurs is further improved.
In some specific embodiments, after carrying out packet loss retransmission on a data packet which cannot be subjected to packet loss recovery, a transmitting end recovers an original sequence number of retransmission packet loss data, and inserts the retransmission packet loss data into a receiving queue; the receiving queue is used for sequentially queuing the received data packets by the receiving end.
It can be appreciated that in the above embodiment, after receiving the retransmission packet, the receiving end first recovers its original sequence number and then inserts it into the receiving queue.
In some embodiments, when the transmitting end performs packet loss retransmission on the data packet that cannot be subjected to packet loss recovery, the method further includes:
determining the number of times of NACK received by a transmitting end;
and retransmitting the lost packet data based on a fast retransmission mechanism in retransmission timing time if the number of times of NACK received by the transmitting end is larger than a preset number of times.
In some specific embodiments, the receiving end periodically transmits the NACK.
It will be appreciated that in the above embodiment, when the preset number of redundant ACKs is 3, the method is repeated three times in addition to the first normal NACK reception, and after the repeated three times, we will enter fast retransmission and repeat the missing ACK three times in succession.
In some embodiments, the method further comprises: acquiring an actual packet loss rate;
and setting early warning information based on the relation between the actual packet loss rate and the preset packet loss rate.
It will be appreciated that in the above embodiments, the data packets may be lost in the transmission bandwidth for various reasons, and the network packet loss is one of the common faults in the network, which may cause a decrease in the network speed or even cause a network interruption. Packet loss rate is different due to different network faults. Therefore, the failure cause can be judged according to the packet loss condition and early warning information can be sent out.
In some embodiments, a preset packet loss rate matrix P0 is preset, and p0= (P1, P2, P3) is set, where P1 is a first preset packet loss rate, P2 is a second preset packet loss rate, and P3 is a third preset packet loss rate, where P1 < P2 < P3;
presetting a preset early warning information matrix G0, and setting G0= (G1, G2 and G3), wherein G1 is first preset early warning information, G2 is second preset early warning information and G3 is third preset early warning information;
setting early warning information G according to the relation between the packet loss rate P and each preset packet loss rate:
when P is smaller than P1, selecting the first preset early warning information G1 as early warning information G;
when P1 is less than or equal to P2, selecting the second preset early warning information G2 as early warning information G;
and when P2 is less than or equal to P3, selecting the third preset early warning information G3 as early warning information G.
It can be understood that in the above embodiment, the early warning information G is set according to the relationship between the packet loss rate P and each preset packet loss rate, so as to preliminarily determine the network failure, and facilitate searching the reason for the excessively high packet loss rate.
For example, a preset packet loss rate matrix P0 is preset, and p0= (1%, 30%, 50%) is set, where 1% is a first preset packet loss rate, 30% is a second preset packet loss rate, and P3 is a third preset packet loss rate, where 1% < 30% < 50%;
presetting a preset early warning information matrix G0, and setting G0= (G1, G2 and G3), wherein G1 is first preset early warning information (the transmission of a network data packet has serious timeout), G2 is second preset early warning information (the transmission of the network data packet has serious timeout), and G3 is third preset early warning information (the transmission of the network data packet is on and off);
setting early warning information G according to the relation between the packet loss rate P and each preset packet loss rate:
when P is less than 1%, selecting the first preset early warning information G1 as early warning information G;
when P is more than or equal to 1% and less than 30%, selecting the second preset early warning information G2 as early warning information G;
and when the P is more than or equal to 30% and less than 50%, selecting the third preset early warning information G3 as the early warning information G.
It should be noted that, the packet loss rate P and the early warning information G may be selected by those skilled in the art according to actual situations, which does not affect the protection scope of the present application.
It should be understood that, although the steps in the flowcharts of the embodiments of the present invention are shown in order as indicated by the arrows, these steps are not necessarily performed in order as indicated by the arrows. The steps are not strictly limited to the order of execution unless explicitly recited herein, and the steps may be executed in other orders. Moreover, at least some of the steps in various embodiments may include multiple sub-steps or stages that are not necessarily performed at the same time, but may be performed at different times, nor do the order in which the sub-steps or stages are performed need to be sequential, but may be performed in rotation or alternating with at least a portion of the sub-steps or stages of other steps or steps.
Those of ordinary skill in the art will appreciate that: the above is only a preferred embodiment of the present invention, and the present invention is not limited thereto, but it is to be understood that the present invention is described in detail with reference to the foregoing embodiments, and modifications and equivalents of some of the technical features described in the foregoing embodiments may be made by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (9)
1. The packet loss retransmission method is characterized by comprising the following steps of:
after receiving the data packet, the receiving end judges whether packet loss occurs;
determining packet loss codes with packet loss, and finding corresponding packet loss data in a redundant channel to carry out packet loss recovery;
when packet loss recovery cannot be performed, the receiving end sends NACK to the sending end;
the transmitting end carries out packet loss retransmission on the data packet which can not be subjected to packet loss recovery;
the transmitting end carries out packet loss retransmission on the data packet which can not be subjected to packet loss recovery, and the method comprises the following steps:
determining packet loss codes of packet loss data;
and finding out a corresponding data packet at the transmitting end to carry out packet loss retransmission.
2. The method for retransmitting lost packets according to claim 1, wherein the determining whether packet loss occurs comprises:
determining a preset redundant ACK frequency threshold based on the transmission condition of the data packet;
and when the number of redundant ACK exceeds a preset threshold value of the number of redundant ACK, judging that packet loss occurs.
3. The method for retransmitting lost packets according to claim 2, wherein the determining the preset redundancy ACK number threshold based on the transmission condition of the data packet includes:
determining the number of data packets sent by a sending end;
predicting the arrival sequence condition of the data packets received by the receiving end based on the number of the data packets;
classifying the arrival sequence condition of the data packet received by the receiving end, wherein the classification comprises: the data packets are not lost, the data packets arrive out of order and are not lost and the data packets arrive lost;
determining the probability of redundant ACK of different categories;
and inputting the probability of redundant ACK of different categories into a preset relation model, and obtaining a preset redundant ACK frequency threshold.
4. The packet loss retransmission method according to claim 3, wherein the establishing of the deep learning model comprises: defining an input layer and an output layer, selecting the probability of redundant ACK when a data packet is not lost, the probability of redundant ACK when the data packet is out of order to reach the non-lost state and the probability of redundant ACK when the data packet is lost to reach the non-lost state as input variables, and inputting dimension m=3; taking a preset redundancy ACK frequency threshold as an output variable, and outputting the dimension n=1;
and selecting the hidden layer number and the hidden layer unit number, adopting a single hidden layer, and determining the hidden layer node number to be 4.
5. The method for retransmitting lost packets according to claim 1, wherein after retransmitting lost packets which cannot be retransmitted by the transmitting end, the original sequence number of the retransmitted lost packets is recovered, and the retransmitted lost packets are inserted into the receiving queue; the receiving queue is used for sequentially queuing the received data packets by the receiving end.
6. The method for retransmitting lost packets according to claim 1, wherein when the transmitting end retransmits lost packets of the data packet for which the lost packet recovery is impossible, the method further comprises:
determining the number of times of NACK received by a transmitting end;
and retransmitting the lost packet data based on a fast retransmission mechanism in retransmission timing time if the number of times of NACK received by the transmitting end is larger than a preset number of times.
7. The method for retransmission of lost packets according to claim 6, wherein the receiving end periodically transmits the NACK.
8. The method for retransmitting lost packets according to claim 1, further comprising: acquiring an actual packet loss rate;
and setting early warning information based on the relation between the actual packet loss rate and the preset packet loss rate.
9. The method for retransmission of lost packets according to claim 7, wherein a preset packet loss rate matrix P0 is preset, p0= (P1, P2, P3) is set, wherein P1 is a first preset packet loss rate, P2 is a second preset packet loss rate, and P3 is a third preset packet loss rate, wherein P1 < P2 < P3;
presetting a preset early warning information matrix G0, and setting G0= (G1, G2 and G3), wherein G1 is first preset early warning information, G2 is second preset early warning information and G3 is third preset early warning information;
setting early warning information G according to the relation between the pressure P and each preset packet loss rate:
when P is smaller than P1, selecting the first preset early warning information G1 as early warning information G;
when P1 is less than or equal to P2, selecting the second preset early warning information G2 as early warning information G;
and when P2 is less than or equal to P3, selecting the third preset early warning information G3 as early warning information G.
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| CN116506354A (en) * | 2023-06-30 | 2023-07-28 | 天地信息网络研究院(安徽)有限公司 | NDN router and active congestion packet loss recovery method thereof |
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