CN117220830A - Wireless network data transmission method, transmitting terminal and receiving terminal - Google Patents
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Abstract
The invention discloses a wireless network data transmission method, a transmitting end and a receiving end, belonging to the technical field of network communication; comprising the following steps: acquiring original data; setting system parameters, and randomly and linearly encoding original data according to the system parameters to generate a plurality of encoded data packets; wherein, the system parameters comprise coding redundancy and coding window size; sequentially sending a plurality of coded data packets to a receiving end, and judging whether to adjust the coding redundancy according to a feedback result of the receiving end; the invention carries out random linear network coding on the original data at the transmitting end to generate a plurality of coded data packets, the receiving end carries out the choice of the coded data packets according to the coding information of the obtained coded data packets, judges whether to adjust the coding redundancy according to the feedback result of the receiving end, regenerates the coded data packets according to the adjusted coding redundancy, and has the characteristics of no code rate constraint, adjustable redundancy and recoding permission of intermediate nodes.
Description
Technical Field
The invention relates to a wireless network data transmission method, a sending end and a receiving end, and belongs to the technical field of network communication.
Background
Wireless networks typically include wireless local area networks, multi-hop Mesh networks, star-to-ground networks, temporary networks built based on Wi-fi direct or other ad hoc networking technologies, and the like. In these wireless networks, end-to-End communication (End-to-End communication) is the basic function that these networks all possess. However, wireless channels can fade due to signal attenuation, shadowing, and multipath effects, and can also be subject to interference from a variety of factors in the environment, resulting in difficulties in delay of end-to-end data packet transmission, misordering, data packet loss, and so forth. Especially in networks where data packets involved in end-to-end communication need to be relayed via multi-hop intermediate nodes, it is an important issue how to improve the reliability of the end-to-end data packet transmission.
In order to improve the reliability of data transmission, the end-to-end transmission protocol takes a series of measures to cope with the problems of data packet loss, disorder, etc. To solve this problem, a series of protocols or methods have been proposed, typically including transport layer error control, source packet loss retransmission and source packet coding:
1) Error control method for transmission layer. The TCP transport layer protocol is a reliable transport protocol for the transport layer, and in order to ensure reliable delivery of end-to-end data packets, a "three-way handshake" mechanism is employed to ensure reliable end-to-end data transmission. In a typical client-server data request application employing TCP, a client first sends a request packet with a SYN flag to a server to establish a reliable connection ("first handshake"); after receiving the request, the server sends an acknowledgement packet with SYN and ACK flags to the client indicating that the connection is agreed to be established ("second handshake"). After receiving the acknowledgement, the client sends a data packet with an ACK flag to the server, acknowledging the connection establishment ("third handshake"). Through three-way handshake, the client and the server both confirm the receiving and transmitting capability of the other party, synchronize the initial serial numbers, and ensure the reliability and the correctness of data transmission. In the transmission process, TCP ensures the orderly arrival of data through a sequence number and an acknowledgement mechanism, a sender allocates a sequence number to each data packet, and a receiver informs the sender of the successfully received data packet through the acknowledgement sequence number. TCP recovers the lost data packet and the data packet with error detection after receiving by adopting a timeout retransmission and automatic retransmission request mechanism. The integrity and the order of data transmission can be ensured through the confirmation and retransmission mechanism, however, in an actual network communication environment, the bandwidth and the capacity of a network are limited, if data is sent unrestrictedly, the data flow exceeds the processing capacity of the network, so that network congestion is generated, and data packets are lost, the transmission delay is increased, and even the network is paralyzed. To avoid the above problems, TCP manages network congestion through its congestion control algorithm, ensures that data traffic in the network is within a reasonable range, and avoids excessive congestion and data loss. The congestion control is to dynamically adjust the sending rate, when the packet loss occurs, the congestion algorithm regards the packet loss as a signal of network congestion, the data sending rate is reduced, and the sending end is enabled to increase the sending rate when continuous data packets are successfully sent, and the current network load condition is adapted through the adjustment of the dynamic sending rate.
2) A method based on source end data packet coding; in addition to the transport layer protocol, researchers have also proposed a number of methods and means for improving end-to-end transmission performance in wireless networks, the simplest being source end-to-end packet loss retransmission, which tends to increase the delay of the end-to-end data delivery task and reduce the transmission efficiency. A typical scheme in the improved method is a source-side packet coding method, such as based on forward error correction coding (ForwardErrorCorrection, FEC). At the transmitting end, the data is split into a series of packets and redundant information is added. The receiving end can use the redundant information to correct errors in partial data packets so as to restore the original data. The FEC can effectively resist the loss or damage of a certain number of data packets, and improves the reliability of data transmission. In wireless networks, FEC may be used to mitigate losses and errors in data packet transmissions due to the nature of random packet loss. There are a number of end-to-end data transmission protocols currently emerging which are based on FEC methods, such as the QUIC-FEC protocol proposed in 2019.
Disclosure of Invention
The invention aims to overcome the defects in the prior art, provides a wireless network data transmission method, a sending end and a receiving end, has the characteristics of no code rate constraint, adjustable redundancy and recoding permission of an intermediate node, and solves the problems that network congestion is caused in the current wireless network data transmission and the time delay of an end-to-end data delivery task is increased.
In order to achieve the above purpose/solve the above technical problems, the present invention is realized by adopting the following technical scheme:
in a first aspect, a wireless network data transmission method includes:
acquiring original data;
setting system parameters, and randomly and linearly encoding original data according to the system parameters to generate a plurality of encoded data packets; wherein, the system parameters comprise coding redundancy and coding window size;
and sequentially sending the plurality of coded data packets to a receiving end, judging whether to adjust the coding redundancy according to a feedback result of the receiving end, if so, adjusting the coding redundancy, repackaging the original data according to the adjusted coding redundancy, and sending the newly generated coded data packets to the receiving end.
Further, the setting the system parameter, randomly and linearly encoding the original data according to the system parameter, and generating a plurality of encoded data packets, including:
dividing the original data with the length L into W parts with the same size according to the size W of the coding window, obtaining the original data of the packet and updating the packet number;
generating a random linear coding matrix according to the coding redundancy and the size of a coding window, and performing coding operation on the grouped original data through the random linear coding matrix to obtain coded data and coded vectors which are equal to the original data in length;
and (3) packaging the coded data to obtain a coded data packet comprising a packet number, a coding window size W, a coding vector and the coded data.
Still further, the encoding vector is used to record the encoding coefficient vector in the encoding process, and the encoding coefficient vector is randomly selected from the finite field.
Still further, the finite field includes a finite field GF (2 8 )。
Further, the determining whether to adjust the coding redundancy according to the feedback result of the receiving end, if yes, adjusting the coding redundancy includes:
if the feedback result of the receiving end is decoding failure, the adjustment mode of the coding redundancy is as follows:
R’＝R+d；
wherein R' is the adjusted coding redundancy; r is the redundancy of original codes; d is the redundancy adjustment step length;
if the feedback result of the receiving end is that the continuous decoding is successful, the adjustment mode of the redundancy is as follows:
R’＝R-d；
wherein R' is the adjusted coding redundancy; r is the redundancy of original codes; d is the redundancy adjustment step size.
In a second aspect, a wireless network data transmission method includes:
sequentially acquiring a plurality of coded data packets;
acquiring the coding information of the coding data packet, if the coding information accords with the preset condition, reserving the coding data packet, otherwise, discarding the coding data packet;
when the reserved coded data packets meet the quantity requirement, decoding the coded data packets;
and feeding back the decoding result to the transmitting end.
Further, the obtaining the encoded information of the encoded data packet, if the encoded information meets a preset condition, then retaining the encoded data packet, otherwise discarding the encoded data packet, including:
acquiring the packet number of a current coded data packet;
judging whether a preset decoding mark already contains the packet number of the current coding data packet, and if so, directly discarding the current coding data packet; and if the packet number of the current coding data packet is not contained, reserving the current coding data packet.
Further, the number of reserved encoded data packets satisfies the number requirement that the number of reserved encoded data packets is the same as the size of the encoding window.
In a third aspect, a transmitting end includes:
the acquisition module is used for acquiring the original data;
the processing module is used for setting system parameters, packaging the original data according to the system parameters and generating a plurality of coded data packets; wherein the system parameters include coding redundancy and coding window size.
And the judging and generating module sequentially sends the plurality of coded data packets to the receiving end, judges whether to adjust the coding redundancy according to the feedback result of the receiving end, adjusts the coding redundancy if yes, and repacks the original data according to the adjusted coding redundancy.
And the sending module is used for sending the coded data packet to the receiving end.
In a fourth aspect, a receiving end includes:
the acquisition module is used for acquiring the coded data packet;
the judging module is used for acquiring the coding information of the coding data packet, if the coding information accords with the preset condition, the coding data packet is reserved, and if not, the coding data packet is abandoned.
And the decoding module is used for decoding the coded data packets when the reserved coded data packets meet the quantity requirement.
And the sending module is used for feeding back the decoding result to the sending end.
Compared with the prior art, the invention has the beneficial effects that:
the invention carries out random linear network coding on the original data at the transmitting end to generate a plurality of coded data packets, the receiving end carries out the choice of the coded data packets according to the coding information of the obtained coded data packets, when the coded data packets meeting the conditions reach a certain number, the decoding operation is started and the decoding result is fed back to the transmitting end, the plurality of coded data packets are sequentially transmitted to the receiving end, whether the coding redundancy is regulated or not is judged according to the feedback result of the receiving end, and the coded data packets are regenerated according to the regulated coding redundancy.
Drawings
Fig. 1 is a flowchart of a wireless network data transmission method provided by an embodiment of the present invention at a transmitting end;
fig. 2 is a flowchart of a wireless network data transmission method provided in an embodiment of the present invention at a receiving end;
fig. 3 is a block diagram of an encoded data packet of a wireless network data transmission method according to an embodiment of the present invention;
fig. 4 is a schematic diagram of a wireless network data transmission method at a transmitting end according to an embodiment of the present invention;
fig. 5 is a schematic diagram of a wireless network data transmission method at a receiving end according to an embodiment of the present invention.
Detailed Description
The invention is further described below with reference to the accompanying drawings. The following examples are only for more clearly illustrating the technical aspects of the present invention, and are not intended to limit the scope of the present invention.
Example 1
A wireless network data transmission method, comprising:
as shown in fig. 1, a transmitting end acquires original data;
setting system parameters, and randomly and linearly encoding original data according to the system parameters to generate a plurality of encoded data packets, wherein the system parameters comprise encoding redundancy and encoding window size, and specifically:
dividing original data with length L into W parts with the same size according to the size W of a coding window, acquiring the grouped original data and updating a grouping number, in the embodiment, in order to simplify a communication process, setting the size W of the coding window to be 4, setting the coding redundancy of a transmitting end to be 1.25, setting the packet loss rate of a communication system to be 0.1, and setting the channel packet loss rate of the communication system to be the same;
as shown in fig. 3, a random linear coding matrix is generated according to the coding redundancy and the size of a coding window, and the coding operation is carried out on the grouped original data through the random linear coding matrix to obtain coded data and coded vectors with the same length as the original data; the coding vector is used for recording coding coefficient vectors in the coding process, and the coding coefficient vectors are randomly selected from a finite field; packaging the coded data to obtain a coded data packet comprising a packet number, a coding window size W, a coding vector and coded data; and sequentially sending the plurality of coded data packets to a receiving end, and sequentially obtaining the plurality of coded data packets by the receiving end.
As shown in fig. 4, the present embodiment employs a finite field GF (2 8 ) The initial packet number GroupID is 1; dividing the original data OD into equal-length original data blocks { P1, P2, P3, P4} according to the size 4 of the coding window, selecting GF (2 from a finite field 8 ) Selecting random coding matrix M with 5 rows and 4 columns composed of random coding coefficients, multiplying the coding matrix M with original data block to obtain row vector of coding coefficient matrix, forming coded data block { E1, E2, E3, E4, E5}, adding coded data block into coded data packet header, recording coded data packet number 1 in coded packet header, coding window small 5, obtaining row coding vector EV from coding coefficient matrix i Forming a complete coded data packet { P1, P2, P3, P4, P5}, and transmitting the coded data packet to a receiving end sequentially through a channel; wherein, the coded data packet may generate random packet loss in the data transmission process.
As shown in fig. 2, the receiving end obtains the coding information of the coded data packet, if the coding information meets the preset condition, the coded data packet is reserved, otherwise, the coded data packet is discarded, specifically:
acquiring the packet number of a current coded data packet;
judging whether a preset decoding mark already contains the packet number of the current coding data packet, and if so, directly discarding the current coding data packet; if the packet number of the current coding data packet is not contained, the current coding data packet is reserved;
when the reserved coded data packets meet the quantity requirement, decoding the coded data packets, wherein: the reserved coded data packets meet the number requirement that the number of reserved coded data packets is the same as the size of the coding window.
As shown in fig. 5, in this embodiment, the receiving end receives the encoded data packet P 1 First from P 1 The method comprises the steps that a group number GroupID is obtained and is 1, a receiving end checks that a DFlag mark is empty, a Flag mark is set to be 1, and the current receiving end is indicated to receive a coded data packet with a coded group number of 1; receiving end receives coded data packet P 1 And obtains the encoding vector EV 1 Encoded data EData 1 Calculating the rank of the coding matrix G to be 0, adding the coding vector EV1 of P1 into the coding matrix, calculating the coding rank of the coding matrix to be 1 again, adding EV1 into the coding matrix G, and adding EData 1 Adding the data into the coded data matrix H, setting Count to 1, and recording the number of received valid coded data packets.
Receiving end receives coded data packet P 2 First from P 2 The obtained group number GroupID is 1, the GroupID is equal to the DFlag mark 1 of the receiving end, and the coded data packet P is received 2 The method comprises the steps of carrying out a first treatment on the surface of the Receiving end receives coded data packet P 2 And obtains the encoding vector EV 2 Encoded data EData 2 The method comprises the steps of carrying out a first treatment on the surface of the The receiving end calculates the rank of the decoding moment G as 1, and P 2 Is of the code vector EV of (1) 2 Adding into the coding matrix G, calculating the rank of the coding matrix to be 2 again, and adding EData 2 Adding the data into the coded data matrix H, setting count to 2, and indicating that the number of the valid decoded data received currently is 2.
Data packet P 3 Lost during transmission.
The receiving end receives the coded data packet P 4 First from P 4 The obtained group number GroupID is 1, the GroupID is equal to the DFlag mark 1 of the receiving end, and the coded data packet P is received 4 The method comprises the steps of carrying out a first treatment on the surface of the The receiving end obtains the coded data packet P 4 And obtains the encoding vector EV 4 Encoded dataEData 4 The method comprises the steps of carrying out a first treatment on the surface of the The receiving end calculates the rank of the decoding moment G as 2, and P 4 Is of the code vector EV of (1) 4 Adding into coding matrix G, calculating the rank of the coding matrix to be 3 again, and adding EData 4 Adding the data into the coded data matrix H, setting count to 3, and indicating that the number of the valid decoded data received currently is 3.
The receiving end receives the coded data packet P 5 First from P 5 The obtained group number GroupID is 1, the GroupID is equal to the DFlag mark 1 of the receiving end, and the coded data packet P is received 5 The method comprises the steps of carrying out a first treatment on the surface of the The receiving end obtains the coded data packet P 5 And obtains the encoding vector EV 5 Encoded data EData 5 The method comprises the steps of carrying out a first treatment on the surface of the The receiving end calculates the rank of the decoding moment G to be 3, and P is calculated 5 Is of the code vector EV of (1) 5 Adding into the coding matrix G, calculating the rank of the coding matrix to be 4 again, and adding EData 5 Adding the data into an encoded data matrix H, setting count as 4, indicating that the number of the currently received effective decoding data is 4, the value of count is equal to the size W of an encoding window at the moment, indicating that the effective decoding data packet which is equal to the original data block in the received packet with the group ID of 1 is the effective decoding data packet, and if the encoding matrix reaches a full rank, conforming the decoding condition (the decoding process is a process for solving a linear equation set, a Gaussian method can be adopted for decoding, and the full rank is a condition for only solving the linear equation set), and performing decoding operation on the encoding data packet;
acquiring a coding matrix G and a coding data matrix H, and calculating an inverse matrix G of the coding matrix G -1 Multiplying the coded data matrix G by the coding matrix -1 The x H obtains the coded data content matrix OD, the row vector of the OD is the original data block { P1, P2, P3, P4}, and the original data block { P1, P2, P3, P4} is delivered upward to the upper network interface, so as to complete the data delivery of this round.
In the continuous multi-round data transmission process, the channel quality is not unchanged, the channel quality can be subjected to the outside to generate different packet loss rates and error rates, and the corresponding coding redundancy degree is adjusted according to the actual communication quality, so that the situation that network congestion can be generated in wireless network data transmission and the time delay of an end-to-end data delivery task is increased can be avoided;
the decoding result is fed back to the sending end, the sending end judges whether to adjust the coding redundancy according to the feedback result of the receiving end, if so, the coding redundancy is adjusted, the original data is packed again according to the adjusted coding redundancy, and the newly generated coding data packet is sent to the receiving end, specifically:
judging whether to adjust the coding redundancy according to the feedback result of the receiving end, if so, adjusting the coding redundancy, including:
if the feedback result of the receiving end is decoding failure, it indicates that the packet loss rate of the current channel may be larger, and the current coding redundancy cannot meet the system communication requirement, and the adjustment mode of the coding redundancy is as follows:
R’＝R+d；
wherein R' is the adjusted coding redundancy; r is the redundancy of original codes; d is the redundancy adjustment step length;
if the feedback result of the receiving end is that the continuous decoding is successful, the current channel packet loss is possibly smaller, and the channel communication quality is better, so that the transmission of redundant data packets with less excessive transmission coding redundancy can be reduced, the data transmission efficiency of the system is improved, and the adjustment mode of the coding redundancy is as follows:
R’＝R-d；
wherein R' is the adjusted coding redundancy; r is the redundancy of original codes; d is the redundancy adjustment step length, the receiving end uses a sum variable to record the number of the packets successfully decoded continuously, the sum value reaches 10, namely, the original number data of the 10 packets successfully decoded continuously is indicated, continuous decoding success feedback information is sent to the sending end S, and the sum is set to zero.
Example 2
A transmitting end comprising:
the acquisition module is used for acquiring the original data;
the processing module is used for setting system parameters, packaging the original data according to the system parameters and generating a plurality of coded data packets; wherein the system parameters include coding redundancy and coding window size.
And the judging and generating module sequentially sends the plurality of coded data packets to the receiving end, judges whether to adjust the coding redundancy according to the feedback result of the receiving end, adjusts the coding redundancy if yes, and repacks the original data according to the adjusted coding redundancy.
And the sending module is used for sending the coded data packet to the receiving end.
Example 3
A receiving end, comprising:
the acquisition module is used for acquiring the coded data packet;
the judging module is used for acquiring the coding information of the coding data packet, if the coding information accords with the preset condition, the coding data packet is reserved, and if not, the coding data packet is abandoned.
And the decoding module is used for decoding the coded data packets when the reserved coded data packets meet the quantity requirement.
And the sending module is used for feeding back the decoding result to the sending end.
The foregoing is merely a preferred embodiment of the present invention, and it should be noted that modifications and variations could be made by those skilled in the art without departing from the technical principles of the present invention, and such modifications and variations should also be regarded as being within the scope of the invention.
Claims (10)
1. A method for wireless network data transmission, comprising:
acquiring original data;
setting system parameters, and randomly and linearly encoding original data according to the system parameters to generate a plurality of encoded data packets; wherein, the system parameters comprise coding redundancy and coding window size;
and sequentially sending the plurality of coded data packets to a receiving end, judging whether to adjust the coding redundancy according to a feedback result of the receiving end, if so, adjusting the coding redundancy, repackaging the original data according to the adjusted coding redundancy, and sending the newly generated coded data packets to the receiving end.
2. The wireless network data transmission method according to claim 1, wherein the setting of the system parameters, the random linear encoding of the original data according to the system parameters, the generating of the plurality of encoded data packets, comprises:
dividing the original data with the length L into W parts with the same size according to the size W of the coding window, obtaining the original data of the packet and updating the packet number;
generating a random linear coding matrix according to the coding redundancy and the size of a coding window, and performing coding operation on the grouped original data through the random linear coding matrix to obtain coded data and coded vectors which are equal to the original data in length;
and (3) packaging the coded data to obtain a coded data packet comprising a packet number, a coding window size W, a coding vector and the coded data.
3. The wireless network data transmission method of claim 2, wherein the code vector is used to record a code coefficient vector in the encoding process, and the code coefficient vector is randomly selected from a finite field.
4. A wireless network data transmission method according to claim 3, characterized in that the finite field comprises a finite field GF (2 8 )。
5. The wireless network data transmission method according to claim 1, wherein the determining whether to adjust the coding redundancy according to the feedback result of the receiving end, if so, adjusting the coding redundancy includes:
if the feedback result of the receiving end is decoding failure, the adjustment mode of the coding redundancy is as follows:
R’＝R+d；
wherein R' is the adjusted coding redundancy; r is the redundancy of original codes; d is the redundancy adjustment step length;
if the feedback result of the receiving end is that the continuous decoding is successful, the adjustment mode of the redundancy is as follows:
R’＝R-d；
wherein R' is the adjusted coding redundancy; r is the redundancy of original codes; d is the redundancy adjustment step size.
6. A method for wireless network data transmission, comprising:
sequentially acquiring a plurality of coded data packets;
acquiring the coding information of the coding data packet, if the coding information accords with the preset condition, reserving the coding data packet, otherwise, discarding the coding data packet;
when the reserved coded data packets meet the quantity requirement, decoding the coded data packets;
and feeding back the decoding result to the transmitting end.
7. The method for wireless network data transmission according to claim 6, wherein the obtaining the encoded information of the encoded data packet, if the encoded information meets a preset condition, reserves the encoded data packet, otherwise discards the encoded data packet, includes:
acquiring the packet number of a current coded data packet;
judging whether a preset decoding mark already contains the packet number of the current coding data packet, and if so, directly discarding the current coding data packet; and if the packet number of the current coding data packet is not contained, reserving the current coding data packet.
8. The method of claim 6, wherein the number of reserved encoded data packets is equal to the size of the encoding window when the number of reserved encoded data packets meets the requirement.
9. A transmitting terminal, comprising:
the acquisition module is used for acquiring the original data;
the processing module is used for setting system parameters, packaging the original data according to the system parameters and generating a plurality of coded data packets; wherein the system parameters include coding redundancy and coding window size.
And the judging and generating module sequentially sends the plurality of coded data packets to the receiving end, judges whether to adjust the coding redundancy according to the feedback result of the receiving end, adjusts the coding redundancy if yes, and repacks the original data according to the adjusted coding redundancy.
And the sending module is used for sending the coded data packet to the receiving end.
10. A receiving terminal, comprising:
the acquisition module is used for acquiring the coded data packet;
the judging module is used for acquiring the coding information of the coding data packet, if the coding information accords with the preset condition, the coding data packet is reserved, and if not, the coding data packet is abandoned.
And the decoding module is used for decoding the coded data packets when the reserved coded data packets meet the quantity requirement.
And the sending module is used for feeding back the decoding result to the sending end.
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