CN113242155A - Method and system for recovering packet loss of data packet and computer readable storage medium - Google Patents
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- H—ELECTRICITY
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- H04L43/0829—Packet loss
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Abstract
The invention discloses a method, a system and a computer readable storage medium for recovering packet loss of a data packet, wherein the method comprises the following steps: a sender sends a plurality of original data packets, a plurality of redundant data packets and forward error correction codes to a receiver; in the sending process, the receiving party monitors whether the network packet loss occurs to cause the loss of an original data packet and a redundant data packet; if the original data packet and the redundant data packet are lost, the receiver recovers the lost original data packet by using forward error correction according to the successfully received original data packet, the successfully received redundant data packet and the forward error correction code. The invention can recover the original data packet which has lost the packet through the forward error correction, and can also send the limited redundant information through the forward error correction method to correct the packet without increasing the bandwidth.
Description
Technical Field
The present invention relates to the field of intelligent push technologies, and in particular, to a method and a system for recovering packet loss of a data packet, and a computer-readable storage medium.
Background
Packet loss (Packet loss) means that data of one or more data packets (packets) cannot reach a destination through the network. The packet loss may be caused by various reasons, including signal degradation (signal degradation) caused by multi-path fading (multi-path fading) in the network, or packet drop (packet drop) caused by channel blocking, and further, damaged packets (corrupted packets) are rejected, or a defect hardware on the network, a failure of a driver on the network may cause packet loss. In addition, packet loss is also affected by the signal-to-noise ratio (SNR) of the signal. Packet loss can cause jitter (jitter) in streaming media technology, VoIP, online games and video conferencing, and can affect other online applications to some extent.
At present, to solve the voice problem caused by packet loss, the operation of sending redundant packets is mostly performed, for example, the contents of the first two packets are sent once again in the current voice packet, so that the bandwidth is greatly increased.
Accordingly, the prior art is yet to be improved and developed.
Disclosure of Invention
The present invention mainly aims to provide a method, a system and a computer readable storage medium for recovering packet loss of a data packet, and aims to solve the problem that bandwidth is increased in order to overcome a voice manner caused by packet loss in the prior art.
In order to achieve the above object, the present invention provides a method for recovering packet loss of a data packet, where the method for recovering packet loss of a data packet includes the following steps:
a sender sends a plurality of original data packets, a plurality of redundant data packets and forward error correction codes to a receiver;
in the sending process, the receiving party monitors whether the network packet loss occurs to cause the loss of an original data packet and a redundant data packet;
if the original data packet and the redundant data packet are lost, the receiver recovers the lost original data packet by using forward error correction according to the successfully received original data packet, the successfully received redundant data packet and the forward error correction code.
Optionally, in the method for recovering a packet loss, a plurality of the redundant data packets are generated by a forward error correction encoder according to a plurality of original data packets.
Optionally, in the method for recovering packet loss, the redundant packet is derived from the original packet by using an exclusive or operation.
Optionally, the method for recovering packet loss of a data packet, where the method for recovering packet loss of a data packet further includes:
the sender sends a first original data packet, a second original data packet, a third original data packet, a first redundant data packet, a second redundant data packet and forward error correction codes to the receiver;
in the sending process, the receiving party monitors whether the network packet loss occurs to cause the loss of an original data packet and a redundant data packet;
if the third original data packet and the first redundant data packet are lost, the receiver recovers the lost third original data packet by using forward error correction according to the successfully received first original data packet, the second redundant data packet and the forward error correction code.
Optionally, in the method for recovering a packet loss, the first redundant data packet and the second redundant data packet are generated by a forward error correction encoder according to the first original data packet, the second original data packet, and the third original data packet.
Optionally, in the method for recovering a packet loss, the first redundant packet and the second redundant packet are derived from the first original packet, the second original packet, and the third original packet by using an exclusive or operation.
Optionally, the method for recovering packet loss of the data packet, wherein the fec encoder recovers the lost data at the receiving side according to an encoding rule defined by the sending side.
Optionally, in the method for recovering a lost packet of a data packet, the fec encoder corrects an error of an original data packet by sending limited redundant information.
In addition, in order to achieve the above object, the present invention further provides a system for recovering packet loss, where the system for recovering packet loss includes: a sender and a receiver;
the sender sends a plurality of original data packets, a plurality of redundant data packets and forward error correction codes to the receiver;
in the sending process, the receiving party monitors whether the network packet loss occurs to cause the loss of an original data packet and a redundant data packet;
if the original data packet and the redundant data packet are lost, the receiver recovers the lost original data packet by using forward error correction according to the successfully received original data packet, the successfully received redundant data packet and the forward error correction code.
In addition, to achieve the above object, the present invention further provides a computer readable storage medium, wherein the computer readable storage medium stores a packet loss recovery program, and when the packet loss recovery program is executed by a processor, the method for recovering packet loss as described above is implemented.
In the invention, a sender sends a plurality of original data packets, a plurality of redundant data packets and forward error correction codes to a receiver; in the sending process, the receiving party monitors whether the network packet loss occurs to cause the loss of an original data packet and a redundant data packet; if the original data packet and the redundant data packet are lost, the receiver recovers the lost original data packet by using forward error correction according to the successfully received original data packet, the successfully received redundant data packet and the forward error correction code. The invention can recover the original data packet which has lost the packet through the forward error correction, and can also send the limited redundant information through the forward error correction method to correct the packet without increasing the bandwidth.
Drawings
Fig. 1 is a flowchart of a method for recovering packet loss according to a preferred embodiment of the present invention;
fig. 2 is a schematic diagram illustrating data packet recovery after network packet loss occurs in the preferred embodiment of the method for recovering packet loss according to the present invention;
FIG. 3 is a diagram illustrating the RTP packet structure in the preferred embodiment of the recovery method for packet loss according to the present invention;
fig. 4 is a schematic diagram of an FEC packet structure in the preferred embodiment of the method for recovering packet loss according to the present invention;
fig. 5 is a schematic diagram of a system for recovering packet loss according to a preferred embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer and clearer, the present invention is further described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
As shown in fig. 1, the method for recovering packet loss of a data packet according to a preferred embodiment of the present invention includes the following steps:
step S10, the sender sends a plurality of original data packets, a plurality of redundant data packets and forward error correction codes to the receiver;
step S20, in the sending process, the receiver monitors whether the network packet loss causes the loss of the original data packet and the redundant data packet;
and step S30, if the original data packet and the redundant data packet are lost, the receiving party recovers the lost original data packet by using forward error correction according to the successfully received original data packet, the redundant data packet and the forward error correction code.
Wherein a plurality of the redundant data packets are generated from a plurality of original data packets by a forward error correction encoder. The redundant data packet is derived from the original data packet using an exclusive-or operation.
Specifically, the sender sends a first original data packet, a second original data packet, a third original data packet, a first redundant data packet, a second redundant data packet, and a forward error correction code to the receiver; in the sending process, the receiving party monitors whether the network packet loss occurs to cause the loss of an original data packet and a redundant data packet; if the third original data packet and the first redundant data packet are lost, the receiver recovers the lost third original data packet by using forward error correction according to the successfully received first original data packet, the second redundant data packet and the forward error correction code.
Wherein the first redundant data packet and the second redundant data packet are generated by a forward error correction encoder according to the first original data packet, the second original data packet and the third original data packet. The first redundant data packet and the second redundant data packet are derived from the first original data packet, the second original data packet and the third original data packet using an exclusive-or operation. The forward error correction encoder recovers lost data at the receiver according to encoding rules defined by the sender. The forward error correction encoder corrects errors in the original data packets by sending limited redundant information.
For example, as shown in fig. 2, Forward Error Correction (FEC) recovers lost data at the receiving side according to coding rules defined by the transmitting side. Both the original and redundant data information is transmitted to the receiving end. The redundant data is derived from the original data using an exclusive or (XOR) operation: a parity packet is generated for a given original data packet. FEC transmits k original data packets (D) and an additional h redundant parity packets (P). The FEC encoder generates two redundant packets (P1, P2) from the three packets. If one data packet (D3) and one parity packet (P1) are lost, the receiver can recover the data packet using the successfully received data packets D1, D2, and P2 (D3).
RTP payload format for general FEC, this document specifies the payload format for general forward error correction based on XOR (parity check) operations. The sender takes a set of packets from the media stream and applies an XOR operation across the payload and RTP header. The result is an RTP packet containing FEC information. Since FEC is sent as a single stream, receivers that do not implement FEC can ignore FEC packets.
Further, the primary encoding includes:
media package: a combination of a media header and a media payload;
media header: an RTP header for the media payload;
media payload: unprotected original user data.
The secondary encoding includes:
FEC packet: a combination of an FEC header and an FEC payload;
FEC header: header information contained in the FEC packet;
FEC payload: payload in FEC packets.
Parity check code: the XOR operator f (x, y, …) is applied to the packets x, y, … to generate the parity packets. For efficient reconstruction, the parity packets should be generated from linearly independent packet combinations. For example, a parity packet may be designed over two data packets.
Scheme 1: ab c d e, media stream f (a, b) f (b, c) f (c, d) f (d, e), FEC stream can design a single parity packet more than two and three data packets, and send only FEC stream. Scheme 2: f (a, b) f (a, c) f (a, b, c) f (c, d) f (c, e) f (c, d, e) FEC streams.
The FEC packet is constructed by placing the FEC header and FEC payload into the RTP payload field, as shown in fig. 3 and 4.
Rtp header in FEC packet, P, X, CC, M: an FEC operation (XOR); PT of FEC is determined by dynamic and out-of-band method. FEC sequence number: previous packet FEC sequence number + 1; time stamp of FEC: the instant time of FEC packet transmission; synchronization Source (SSRC): the same SSRC value as the media stream it protects; source (CSCR): it is discarded.
Header, length recovery, PT recovery and timestamp recovery for FEC, calculated by FEC operation (XOR); sn base (N): minimum sequence number header extension of FEC protected media packets; masking: if the ith bit in the 24-bit mask is set to 1, the media packet with sequence number N + i is associated with the FEC packet. FEC payload calculation (XOR) by FEC operation.
Fixed forward error correction refers to the RFC2733 base application. This function is for voice stream and fax/modem packets in voice stream: fax/modem pass through. The host will be able to control the number of voice packets (up to 16 consecutive packets) used in generating the FEC payload. The host will also control which of these packets will be used to generate the FEC payload (8 possible combinations of 16 consecutive packets). The FEC decoder will determine the FEC settings from the input stream. The settings for generating and receiving FEC payloads may be asymmetric. The FEC stream will be included with the voice stream or presented as a separate packet stream.
In-band: if the voice stream comprises an FEC stream, the main voice stream and FEC information will be combined using the RFC2198 redundant audio format. Each FEC payload will be included with the voice packet after the last voice packet used to generate the FEC payload. This will create larger packets for non-fec links at the same packet rate.
Out of band: if the FEC stream is represented as a separate packet stream, each FEC payload will be sent in a separate RTP packet. FEC payload packets will use different payload type values. Each FEC payload packet will be sent immediately after the last voice packet used to generate the FEC payload. This will create a higher packet rate than a non-fec link. In the RFC2733 FEC scheme, not all of the original voice packets need to be transmitted. As shown in scheme 2 in RFC2733, only the FEC payload is available to regenerate all the original voice packets. Other schemes are possible in which only a certain number of original voice data packets are transmitted. This implementation will provide a bit mask to indicate whether each original voice packet within the current packet should be transmitted or dropped. Note that dropping too many original voice packets will not allow the receiving end to recover the packet stream. This is why an invalid combination of dropped packets/FEC payload will cause the device to return an error code. RFC2733[1] is written as generic as possible, so an almost unlimited number of possible FEC schemes can be used. This implementation should be able to decode all possible FEC combinations that can be generated, but cannot guarantee a decodable FEC combination that cannot generate itself. Any FEC combination that cannot be decoded will result in the FEC information in this case being ignored. It does not affect the playback of the original voice packet, nor does it cause any unwanted side effects (e.g., playback stall or channel drop). Significant cases where generation or decoding cannot be done include:
a fec payload created from packets with sequence number differences of 16 or more (valid packets span 16 consecutive packets).
At any time, more than 7 different FEC payload combinations are used (i.e. if a new incoming FEC payload allows a new voice packet to be recovered, only the previous 7 FEC payloads will be checked to see if any other packets can be recovered by the concatenation effect). This is equivalent to processing 8 individual FEC payloads at any one time. Furthermore, the following FEC cases cannot be generated, but can be decoded:
FEC sequences, in which packets vary across or FEC payloads, are generated at FEC.
FEC sequence, where the FEC payload is transmitted before the final voice packet used to generate the FEC payload (e.g., scheme 1 in RFC 2733). The task of setting the jitter buffer by the RPPH command (or JBOPT) is left to the host. It is strongly recommended that the minimum jitter buffer setting be larger than the packet span times the frame size to ensure that any lost data packets, the payload that can be recovered to future FECs will not be recovered by the time of play-out at present.
Intelligent forward error correction: since the implementation of fixed FEC presents some performance weaknesses, some enhancements for fixed FEC have been proposed to optimize FEC error recovery.
FEC recovery power factor: the FEC mask is a key component that defines the FEC error recovery capability. In fact, some mask combinations may result in some poor recovery, or even an unresolved system, which will greatly affect error recovery. A method is proposed to calculate the recovery power in the range 0, 100% at a given FEC setting. The method comprises the step of sequencing FEC configurations corresponding to all the loss error correction rates. The possible recovery rates for each case were calculated. The FEC recovery rate is provided as the ratio of the total loss divided by the total recovery rate. The recovery capability is stronger when the FEC recovery power factor is close to 1, and the recovery performance is poorer when the FEC recovery power factor is less than 50%. The FEC recovery power factor will help determine the effective FEC mask. Since this computation is rather Mips-consuming, it may not be used in a real-time system, but rather as an external tool. This can be extrapolated to a method that optimizes the FEC mask and cross-sum packet rate overhead. However, the first investigation presented some very complex calculations. More investigations are required.
FEC recovery criteria: depending on the user's selection of packets to be sent over the network, and the selection of packets to be FEC encoded/decoded, the FEC algorithm may encounter unsolvable mathematical system situations. This blocking limitation completely affects the coding/decoding efficiency of the FEC. A criterion is proposed that allows knowing from the FEC configuration if the inversion of the implemented FEC system is possible or not.
This criterion is summarized as ms-matrix representation of the transmission process. mf is a matrix representing the FEC process. m-matrix representing the transmission and FEC process. Vp is speech packet vector: dim (vp) ═ Np, 1; rank (m) ═ trace (ms) + rank (mf) ═ Np; while fixed FEC implementations may lead to unresolved problems, the new FEC standard allows knowledge that the FEC process will reverse, thereby enabling recovery of lost packets.
FEC high-order recovery: depending on the occurrence of a loss, regular fixed FEC recovery (loss of one packet/need to recover one FEC packet) may be limited. In fact, when too many packets are lost, first order recovery is not targeted. It is proposed to move the algebraic system into the "rank-n" subsystem until it becomes solvable. To work in a reduced rank system, we use matrix decomposition. Thus, some packets that the fixed fec cannot recover can be recovered.
Adaptive FEC: as previously mentioned, FEC is implemented at the cost of increased communication bandwidth. To address this problem, an adaptive FEC [4] is proposed that adjusts its error recovery capability (and bandwidth consumption) according to the importance of the data. Adaptive FEC changes the FEC mask in real time as needed for recovery. An adaptive FEC is proposed, with three styles, but it can be user defined. High error correction the critical phase of strong FEC requires the best recovery. And (5) medium error correction, namely periodically FEC is carried out on medium phases needing normal recovery. Low error correction light FEC requires optical recovery for the secondary stage.
Adaptive FEC facsimile passes: high error correction signaling V21 Hdlc fax control message. The fax control phase is a key phase that facilitates fax exchange. Failure at these stages can result in hang-up and then significantly reduce Fax Success Rate (FSR). The data is the end of the fax page. And (3) correcting the medium error: the page is modulated by facsimile. Internal fax line compensation can make up for some missing small sheets. This results in the fax machine not hanging. Low error correction: a silent phase.
Voice adaptive FEC: high error correction-frames have high audio energy signals. And a DTMF framework. And correcting the intermediate error by using the frame and the transition speech signal. Low error correction is silent.
Modem adaptive FEC passes: high error correction signal modem control phases (ANSAM, …) are critical phases because they drive the modem data exchange. Failure at these stages may result in hang-up and then significantly reduce Modern Success Rate (MSR). And (3) correcting the medium error: some data phases. Low error correction, silence.
Some results and some adaptive FEC tests show that the method has strong recovery performance under the condition of serious loss of signals passing voice or fax, and the technical effect after FEC is used is as follows: in a common voice call, when the FEC function is not used, the voice quality of 0%, 10%, 20%, 30% of the packet loss rate is 4.35, 2.77, 2.29, 1.86, and the FEC is opened, the voice quality corresponding to the packet loss rate is 4.35, 4.34, 4.32, 3.63, it can be seen that the voice quality decreases slowly with the increase of the packet loss rate after the FEC is opened; similarly, the effect is also remarkable for faxes, and under the condition that the packet loss rate is 8% at 20ms G711, the FEC function is closed, the fax success rate is 0, and the open FEC success rate is 99.08%. In the event of network congestion, a large number of packets may be lost. Then, after the maximum possible FEC recovery, some of the isolated packets cannot be recovered.
In the case of a fax pass, this would correspond to an analog signal interval time, corresponding to the absolute missing packet payload. Faxing can occur at critical stages with such gaps. This effect also applies to modem over-connection success, as well as voice Pesq measurements. A "scaled" adaptive FEC was studied that works at sub-granularity instead of the full packet payload. Thus, when a packet is definitely lost, the lost packet is scattered in the recovered packet, rather than concentrated in one packet.
G.71120 ms a packet lost in a burst results in a positive packet loss. Adaptive FEC: the on-line signal gap is 20 ms. The affected fax machine is mostly hung.
Ratio adaptive FEC ratio/4. The signal interval on the line is 5ms x 4, distributed among the recovered packets. Most fax machines can transmit no signal for more than 5 milliseconds. This small gap of 5 milliseconds can also be hidden by internal codec techniques or data pre-processing.
And renegotiating the adaptive FEC, wherein the initiating end and the remote end can exchange network statistical data (through a protocol RTCP), and the two parties are allowed to adjust respective FEC recovery according to the current network damage.
Further, as shown in fig. 5, based on the above method for recovering packet loss of a data packet, the present invention also provides a system for recovering packet loss of a data packet, where the system for recovering packet loss of a data packet includes: a sender and a receiver; the sender sends a plurality of original data packets, a plurality of redundant data packets and forward error correction codes to the receiver; in the sending process, the receiving party monitors whether the network packet loss occurs to cause the loss of an original data packet and a redundant data packet; if the original data packet and the redundant data packet are lost, the receiver recovers the lost original data packet by using forward error correction according to the successfully received original data packet, the successfully received redundant data packet and the forward error correction code.
The present invention further provides a computer-readable storage medium, wherein the computer-readable storage medium stores a packet loss recovery program, and when the packet loss recovery program is executed by a processor, the method for recovering packet loss of a data packet as described above is implemented.
In summary, the present invention provides a method, a system and a computer readable storage medium for recovering packet loss, where the method includes: a sender sends a plurality of original data packets, a plurality of redundant data packets and forward error correction codes to a receiver; in the sending process, the receiving party monitors whether the network packet loss occurs to cause the loss of an original data packet and a redundant data packet; if the original data packet and the redundant data packet are lost, the receiver recovers the lost original data packet by using forward error correction according to the successfully received original data packet, the successfully received redundant data packet and the forward error correction code. The invention can recover the original data packet which has lost the packet through the forward error correction, and can also send the limited redundant information through the forward error correction method to correct the packet without increasing the bandwidth.
It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
Of course, it will be understood by those skilled in the art that all or part of the processes of the methods of the embodiments described above can be implemented by instructing relevant hardware (such as a processor, a controller, etc.) through a computer program, and the program can be stored in a computer readable storage medium, and when executed, the program can include the processes of the embodiments of the methods described above. The computer readable storage medium may be a memory, a magnetic disk, an optical disk, etc.
It is to be understood that the invention is not limited to the examples described above, but that modifications and variations may be effected thereto by those of ordinary skill in the art in light of the foregoing description, and that all such modifications and variations are intended to be within the scope of the invention as defined by the appended claims.
Claims (10)
1. A method for recovering packet loss of a data packet is characterized in that the method for recovering packet loss of the data packet comprises the following steps:
a sender sends a plurality of original data packets, a plurality of redundant data packets and forward error correction codes to a receiver;
in the sending process, the receiving party monitors whether the network packet loss occurs to cause the loss of an original data packet and a redundant data packet;
if the original data packet and the redundant data packet are lost, the receiver recovers the lost original data packet by using forward error correction according to the successfully received original data packet, the successfully received redundant data packet and the forward error correction code.
2. The method of claim 1, wherein a plurality of the redundant data packets are generated from a plurality of original data packets by a forward error correction encoder.
3. The method according to claim 2, wherein the redundant data packet is derived from the original data packet by using an exclusive-or operation.
4. The method for recovering the packet loss according to claim 1, wherein the method for recovering the packet loss further comprises:
the sender sends a first original data packet, a second original data packet, a third original data packet, a first redundant data packet, a second redundant data packet and forward error correction codes to the receiver;
in the sending process, the receiving party monitors whether the network packet loss occurs to cause the loss of an original data packet and a redundant data packet;
if the third original data packet and the first redundant data packet are lost, the receiver recovers the lost third original data packet by using forward error correction according to the successfully received first original data packet, the second redundant data packet and the forward error correction code.
5. The method according to claim 4, wherein the first redundant data packet and the second redundant data packet are generated by a forward error correction encoder according to the first original data packet, the second original data packet and the third original data packet.
6. The method according to claim 5, wherein the first redundant data packet and the second redundant data packet are derived from the first original data packet, the second original data packet and the third original data packet by using an exclusive-or operation.
7. The method according to claim 1, wherein the fec encoder recovers the lost data at the receiving side according to the coding rule defined by the sending side.
8. The method of claim 1, wherein the FEC encoder corrects errors in original data packets by sending limited redundant information.
9. A system for recovering packet loss, wherein the system for recovering packet loss comprises: a sender and a receiver;
the sender sends a plurality of original data packets, a plurality of redundant data packets and forward error correction codes to the receiver;
in the sending process, the receiving party monitors whether the network packet loss occurs to cause the loss of an original data packet and a redundant data packet;
if the original data packet and the redundant data packet are lost, the receiver recovers the lost original data packet by using forward error correction according to the successfully received original data packet, the successfully received redundant data packet and the forward error correction code.
10. A computer-readable storage medium, storing a packet loss recovery program, which when executed by a processor implements the steps of the packet loss recovery method according to any one of claims 1 to 8.
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| CN114520738B (en) * | 2022-02-09 | 2023-12-05 | 北京电解智科技有限公司 | Data processing method, device and storage medium |
| WO2023202243A1 (en) * | 2022-04-21 | 2023-10-26 | 腾讯科技（深圳）有限公司 | Data processing method and apparatuses, computer device, and storage medium |
| CN114900716A (en) * | 2022-05-11 | 2022-08-12 | 中国电信股份有限公司 | Cloud video data transmission method, cloud platform, cloud terminal and medium |
| CN114900716B (en) * | 2022-05-11 | 2023-09-26 | 中国电信股份有限公司 | Cloud video data transmission method, cloud platform, cloud terminal and medium |
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