CN102142922A - Data transmission method and related device - Google Patents

Abstract

The invention relates to the field of communication technology, and discloses a data transmission method and related equipment. The data transmission method includes: reading the data packet queue that needs to be sent currently from the data packet buffer pool; Encode the data packets in the data packet queue to obtain the data packets after the XOR; perform forward error correction coding on the data packets after the XOR; send the XOR data after the forward error correction coding to the client packet; if an automatic retransmission request is received from the client during the process of sending the forward error correction encoded exclusive-or data packet to the client, then send the forward error correction coded packet to the client The decoded key data packet is encoded, and the automatic retransmission request includes the identification of the decoded key data packet required by the client. By using the invention, the decoding success rate of the client terminal in the 3G network can be improved.

Description

Data transmission method and related equipment

technical field

The invention relates to the field of communication technology, in particular to a data transmission method and related equipment.

Background technique

With the rapid development of the third generation mobile communication (3G: 3 ^rd Generation) technology, it has been applied more and more in operators. The traffic of the 3G network has the characteristics of high speed and high bandwidth occupation, which leads to serious packet loss in the 3G network compared with the ordinary network, which is manifested in the high average packet loss rate and sudden packet loss.

The existing communication network uses Forward Error Correction Coding (FEC: Forward Error Correction) to encode the transmitted data packets, and the transmitted data packets can be XORed data packets encoded by the fountain model encoding method. In the existing 3G network, when the server sends data to the client, the following process is used for data transmission: after the source data is segmented into network data packets, the network data packets are encoded using the fountain model encoding method, and after obtaining the XOR The data packets of the XORed data packets are then encoded by FEC through the FEC data packet encapsulator, and then transmitted through the 3G network layer. After the client receives the FEC-encoded data packet, it uses the FEC data packet decapsulator to perform FEC decoding on the FEC-encoded data packet to obtain the XOR data packet, and uses the The fountain model decoding method can be used to decode the network data packet, and then obtain the source data through the network data packet.

Although the above method can be used to complete the data transmission, the packet loss phenomenon of the 3G network is more serious than that of the ordinary network, especially the problem of losing the key decoded data packets is more prominent, causing the client to obtain the XORed data packets. , the decoding fails due to missing key packets for decoding. Therefore, how to reduce or avoid the loss of decoded key data packets during data transmission is an urgent problem to be solved.

Contents of the invention

The embodiment of the present invention provides a data transmission method and related equipment, so as to reduce or avoid the loss of decoded key data packets during data transmission.

An embodiment of the present invention provides a data transmission method, including:

Read the current packet queue that needs to be sent from the packet buffer pool;

Encoding the data packets in the data packet queue by using a coding method based on the fountain coding model to obtain the data packets after exclusive OR;

performing forward error correction coding on the data packet after the XOR;

Send the forward error correction coded XOR data packet to the client;

If an automatic retransmission request from the client is received during the process of sending the forward error correction coded exclusive-or data packet to the client, then send the forward error correction coded data packet to the client In the decoding of the key data packet, the automatic retransmission request includes the identification of the decoding key data packet required by the client.

The embodiment of the present invention also provides a data transmission method, including:

Receive the FEC-encoded XORed data packet from the server;

performing FEC decoding on the XORed data packets that have undergone forward error correction encoding, to obtain the XORed data packets;

Judging whether the data packet after the XOR is a decoding key data packet;

If the first number of XORed data packets are obtained and the key data packet is still not decoded, an automatic retransmission request is sent to the server, and the automatic retransmission request includes the identifier of the decoded key data packet;

and receive the decoded key data packet which has undergone FEC encoding from the server.

The embodiment of the present invention also provides a server, including a reading unit, an encoding unit, a sending unit, and a receiving unit; wherein:

The reading unit is used to read the current data packet queue to be sent from the data packet buffer pool;

The encoding unit is configured to encode the data packets in the data packet queue read by the reading unit through an encoding method based on the fountain coding model, so as to obtain the data packets after the XOR; for the data after the XOR The packet is forward error correction encoded;

The sending unit is configured to send to the client a data packet that has undergone forward error correction encoding by the encoding unit; The receiving unit receives the automatic retransmission request from the client, and sends the decoded key data packet that has undergone forward error correction encoding to the client, and the automatic retransmission request includes the required information of the client. Decodes the identification of critical packets.

The embodiment of the present invention also provides a client, including:

The receiving unit is used to receive the XORed data packet from the server after forward error correction coding;

A decoding unit, configured to perform FEC decoding on the XORed data packet received by the receiving unit and received by the receiving unit to obtain the XORed data packet;

A judging unit, configured to judge whether the XORed data packet obtained by the decoding unit is a key data packet for decoding;

A sending unit, configured to send an automatic retransmission request to the server when the decoding unit obtains the first number of XORed data packets and the judging unit still judges that no key data packets have been decoded, and the automatic retransmission The transmission request includes the identification of the decoded key data packet;

The receiving unit is further configured to receive the forward error correction coded decoded key data packet from the server.

It can be seen from the above technical solutions provided by the embodiments of the present invention that in the embodiments of the present invention, when the server sends the FEC-encoded XOR data packets to the client, it can receive an ARQ request from the client requesting to decode key data packets , so as to send the decoded key data packet to the client, so as to reduce or avoid the loss of the decoded key data packet during the data transmission process. At the same time, it also enables the client to obtain the decoding key data packets required for decoding, which improves the success rate of decoding and improves the decoding efficiency.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings that need to be used in the description of the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present invention. For those skilled in the art, other drawings can also be obtained based on these drawings without any creative effort.

FIG. 1 is a schematic flow diagram of a data transmission method provided by an embodiment of the present invention;

FIG. 2 is a schematic flowchart of a data transmission method provided by another embodiment of the present invention;

FIG. 3 is a schematic flowchart of a data transmission method provided by another embodiment of the present invention;

FIG. 4 is a schematic flowchart of a data transmission method provided by another embodiment of the present invention;

FIG. 5 is a schematic flowchart of a data transmission method provided by another embodiment of the present invention;

FIG. 6 is a schematic structural diagram of a server provided by another embodiment of the present invention;

FIG. 7 is a schematic structural diagram of a server provided by another embodiment of the present invention;

FIG. 8 is a schematic structural diagram of a server provided by another embodiment of the present invention;

FIG. 9 is a schematic structural diagram of a client provided by another embodiment of the present invention;

Fig. 10 is a schematic structural diagram of a client provided by another embodiment of the present invention.

Detailed ways

The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

First introduce the data transmission method provided by the embodiment of the present invention. FIG. 1 describes the flow of the data transmission method provided by one embodiment of the present invention. The processing flow of the server in the communication network described in this embodiment includes:

101. Read the current packet queue to be sent from the packet buffer pool;

After the server obtains the source data, it divides the source data into network data packets through data fragmentation, and stores the network data packets in the data packet buffer pool, so when the data packets need to be sent, they can be sent from the data packet buffer pool as needed. Read the current queue of packets that need to be sent.

Wherein, in one embodiment of the present invention, the server adopts the sliding window mode to read the data packet queue that needs to be sent currently from the data packet buffer pool, the length of the data packet queue is determined by the window length of the sliding window, and the data packet The initial packet of the queue is determined by the initial position of the sliding window.

102. Encoding the data packets in the data packet queue by means of a coding method based on the fountain coding model, to obtain the data packets after the XOR;

The coding method based on the fountain coding model includes but not limited to the fountain coding method.

103. Perform FEC encoding on the XORed data packet;

104. Send the FEC-encoded XORed data packet to the client;

Sending FEC-encoded XORed packets to the client is an ongoing process.

When sending the FEC-encoded XORed data packet to the client, the degree of the XORed data packet and the identifier of the XORed data packet may be sent at the same time.

When the server uses a sliding window to read the current packet queue to be sent from the packet buffer pool, it can further send the initial position and window length of the sliding window to the client.

105. Receive an ARQ request from the client during the process of sending the FEC-encoded XORed data packet to the client, and the ARQ request includes the identification of the key data packet to be decoded required by the client;

The ARQ request is sent by the client when it has obtained the first number of XOR data packets but still has not decoded the key data packet, wherein the decoding of the key data packet can specifically be a data packet with a degree of 1, because the client only obtains The received XORed data packet can only be decoded if the data packet with a degree of 1 is obtained. Since the data packet received by the client includes the identifier of the participating XOR data packet, the client can determine the identifier of the key data packet required for decoding according to the received identifier of the participating XOR data packet. Further, the identification of the key data packet to be decoded may also be determined according to the initial position and the window length of the sliding window, so as to ensure that the key data packet to be decoded is within the current sliding window.

106. Send the FEC-encoded decoded key data packet to the client.

After the key data packet is decoded to the client, the client can decode the key data packet according to the decoding.

As can be seen from the above, when this embodiment sends the FEC-encoded XOR data packet to the client, it can receive an ARQ request from the client requesting to decode the key data packet, so as to send the decoded key data packet to the client. During data transmission, reduce or avoid the loss of decoded key data packets. At the same time, it also enables the client to obtain the decoding key data packets required for decoding, which improves the success rate of decoding and improves the decoding efficiency.

FIG. 2 describes the flow of a data transmission method provided by another embodiment of the present invention. The processing flow of a server in a communication network described in this embodiment includes:

201. Read the current packet queue to be sent from the packet buffer pool;

202. Encode the data packets in the data packet queue by means of an encoding method based on the fountain encoding model, and obtain the data packets after the XOR;

203. Perform FEC encoding on the XORed data packet;

204. Send the FEC-encoded XORed data packet to the client;

205. Receive an ARQ request from the client during the process of sending the FEC-encoded XORed data packet to the client, and the ARQ request includes the identification of the key decoding data packet required by the client;

206. Send the FEC-encoded decoded key data packet to the client;

Among them, 201-206 can be implemented with reference to 101-106.

207. Receive feedback information from the client during the process of sending the FEC-encoded XORed data packet to the client, where the feedback information includes the identifier of the successfully decoded data packet;

208. Adjust the initial position of the sliding window according to the identifier of the successfully decoded data packet.

For example, the initial position of the current sliding window is data packet No. 1, and the window length is 10, that is, the data packets included in the current sliding window are data packets No. 1 to 10; if the client has successfully decoded data packets No. 1 to 3, then The initial position of the sliding window can be adjusted to the No. 4 data packet. Since the window length has not changed, the data packets included in the adjusted sliding window are No. 4 to No. 13 data packets. At this time, the server can read data packets No. 11-13 from the data packet cache pool, so as to encode and send data packets No. 4-13 to the client. Among them, the adjustment of the initial position of the sliding window is based on the continuous data packets decoded by the client including the data packets of the initial position of the sliding window. Take the data packets included in the current sliding window as data packets No. 1 to No. 10 as an example : If the client has decoded data packets 1-3, the initial position can be adjusted to data packet 4; if the client has decoded data packets 1-2, 4-10, the initial position can only be adjusted to 3 data packets; if the client has decoded data packets No. 2 to No. 10, the initial position of the sliding window cannot be adjusted.

As can be seen from the above, when this embodiment sends the FEC-encoded XOR data packet to the client, it can receive an ARQ request from the client requesting to decode the key data packet, so as to send the decoded key data packet to the client, so that the client The terminal can obtain the decoding key data packets required for decoding, improve the decoding success rate, and improve the decoding efficiency; and can also receive the feedback information returned by the client including the identification of the successfully decoded data packets, according to the successfully decoded data packets Adjust the initial position of the sliding window to avoid continuing to send successfully decoded data packets. At the same time, it can increase the amount of unsent data packets to provide more effective data packets for client decoding.

FIG. 3 describes the flow of a data transmission method provided by another embodiment of the present invention. The processing flow of a server in a communication network described in this embodiment includes:

301. Read the current packet queue to be sent from the packet buffer pool;

302. Encode the data packets in the data packet queue by using a coding method based on the fountain coding model, and obtain the data packets after the XOR;

303. Perform FEC encoding on the XORed data packet;

304. Send the FEC-encoded XORed data packet to the client;

305. During the process of sending the FEC-encoded XORed data packet to the client, an ARQ request is received from the client, and the ARQ request includes the identification of the key decoding data packet required by the client;

306. Send the FEC-encoded decoded key data packet to the client;

307. Receive feedback information from the client during the process of sending the FEC-encoded XORed data packet to the client, where the feedback information includes the identifier of the successfully decoded data packet;

308. Adjust the initial position of the sliding window according to the identifier of the successfully decoded data packet.

Among them, 301-308 can be executed with reference to 201-208.

309. Record the sliding speed of the initial position of the sliding window;

The number of slides at the initial position of the sliding window can be recorded over a period of time, so as to determine the sliding speed of the initial position of the sliding window; for example, if the initial position of the sliding window slides from data packet No. 1 to data packet No. The sliding speed at which the initial position of the sliding window can be determined is 6.

310. Adjust the window length of the sliding window according to the sliding speed.

When the sliding speed at the initial position of the sliding window is fast, it means that the state of the network is good, and the window length of the sliding window can be slightly lengthened at this time; otherwise, when the sliding speed at the initial position of the sliding window is slow, it means that the network The state is poor, and the window length of the sliding window can be slightly reduced at this time. Specifically, the corresponding relationship between the sliding speed of the initial position of the sliding window and the adjusted window length of the sliding window may be preset as required.

As can be seen from the above, when this embodiment sends the FEC-encoded XOR data packet to the client, it can receive an ARQ request from the client requesting to decode the key data packet, so as to send the decoded key data packet to the client, so that the client The terminal can obtain the decoding key data packets required for decoding, improve the decoding success rate, and improve the decoding efficiency; and can also receive the feedback information returned by the client including the identification of the successfully decoded data packets, according to the successfully decoded data packets Adjust the initial position of the sliding window to avoid continuing to send successfully decoded data packets, and at the same time increase the amount of unsent data packets to provide more effective data packets for client decoding; and also record the sliding window The sliding speed of the initial position of , thereby adjusting the window length of the sliding window according to the sliding speed, so that more data packets can be processed effectively.

FIG. 4 describes the flow of a data transmission method provided by another embodiment of the present invention. The processing flow of a client in a communication network described in this embodiment includes:

401. Receive an FEC-encoded XORed data packet from the server;

The received FEC-encoded XORed data packet may include the degree of the XORed data packet and the identifier of the XORed data packet. When the server uses a sliding window to read the current packet queue to be sent from the packet buffer pool, the received FEC-encoded XORed packet may also include the initial position and window length of the sliding window.

402. Perform FEC decoding on the FEC-encoded XORed data packet to obtain the XORed data packet;

403. Determine whether the XORed data packet is a key data packet for decoding;

The decoding of the key data packet is different according to the encoding method. When the data packet after the XOR is encoded by the encoding method based on the fountain coding model, the key data packet can be a data packet with a degree of 1.

404. Send an ARQ request to the server when the first number of XORed data packets are obtained and the key data packet is still not decoded, and the ARQ request includes the identification of the decoded key data packet;

The first number can be determined according to the number of data packets that need to be received. For example, if 15 data packets need to be received, an ARQ request can be sent to the server when 7 data packets are received and the key data packets for decoding are not obtained; The data packet includes the identification of the participating XOR data packet, so the client can determine the identification of the key data packet required for decoding according to the received identification of the participating XOR data packet. Further, the identification of the key data packet to be decoded may also be determined according to the initial position and the window length of the sliding window, so as to ensure that the key data packet to be decoded is within the current sliding window.

405. Receive the FEC-encoded decoded key data packet from the server.

After receiving the FEC-encoded decoding key data packet, FEC decoding can be performed on the FEC-encoded decoding key data packet to obtain the XOR decoded key data packet; and then according to the XOR decoded key data packet and the XOR The subsequent packets are decoded.

As can be seen from the above, this embodiment sends an ARQ request to the server when the first number of XORed data packets are obtained and the key data packet is still not decoded, thereby prompting the server to send the decoded key data packet, thereby obtaining the decoding required Decode key data packets, improve decoding success rate, and improve decoding efficiency.

FIG. 5 describes the flow of a data transmission method provided by another embodiment of the present invention. The processing flow of a client in a communication network described in this embodiment includes:

501. Receive an FEC-encoded XORed data packet from the server;

502. Perform FEC decoding on the FEC-encoded XORed data packet to obtain the XORed data packet;

503. Determine whether the XORed data packet is a key data packet for decoding;

504. When the first number of XORed data packets are obtained and the key data packet is still not decoded, an ARQ request is sent to the server, and the ARQ request includes an identification of the decoded key data packet;

505. Receive the FEC-encoded decoded key data packet from the server.

Among them, 501-505 can be executed with reference to 401-405.

506. Perform FEC decoding on the FEC-encoded decoded key data packet to obtain the decoded key data packet after XOR;

507. Decode according to the XORed decoded key data packet and the XORed data packet.

508. Obtain the identifier of the successfully decoded data packet;

509. Send feedback information to the server, where the feedback information includes identifiers of successfully decoded data packets.

As can be seen from the above, this embodiment sends an ARQ request to the server when the first number of XORed data packets are obtained and the key data packet is still not decoded, thereby prompting the server to send the decoded key data packet, thereby obtaining the decoding required Decoding key data packets, improving the decoding success rate, can improve decoding efficiency; and the identification of the successfully decoded data packets can be sent to the server, so that the server can adjust the initial position and window of the sliding window according to the identification of the successfully decoded data packets. Long, to prevent the server from continuing to send successfully decoded data packets, and at the same time, it can increase the amount of unsent data packets to provide more effective data packets for client decoding, so that more data packets can be processed effectively.

It should be noted that for the foregoing method embodiments, for the sake of simple description, they are expressed as a series of action combinations, but those skilled in the art should know that the present invention is not limited by the described action sequence. Because of the present invention, certain steps may be performed in other orders or simultaneously. Secondly, those skilled in the art should also know that the embodiments described in the specification belong to preferred embodiments, and the actions and modules involved are not necessarily required by the present invention.

Introduce the server provided by the embodiment of the present invention again. FIG. 6 describes the structure of a server provided by another embodiment of the present invention, including a reading unit 601, an encoding unit 602, a sending unit 603, and a receiving unit 604; wherein:

A reading unit 601, configured to read the queue of data packets currently to be sent from the data packet buffer pool;

In an embodiment of the present invention, the reading unit 601 can read the data packet queue in a sliding window manner;

The encoding unit 602 is used to encode the data packets in the data packet queue read by the reading unit 601 through an encoding method based on the fountain coding model to obtain the data packets after the XOR; perform FEC encoding on the data packets after the XOR ;

The sending unit 603 is configured to send to the client the data packet that has been FEC-encoded by the encoding unit 602; if the receiving unit 604 receives an ARQ from the client during the process of sending the FEC-encoded XOR data packet to the client request, and send the FEC-encoded decoding key data packet to the client, and the ARQ request includes the identification of the decoding key data packet required by the client.

In an embodiment of the present invention, the sending unit 603 may further send the initial position and window length of the sliding window when sending the FEC-encoded XOR data packet to the client.

As can be seen from the above, when the server in this embodiment sends the FEC-encoded XOR data packet to the client, it may receive an ARQ request from the client requesting to decode the key data packet, thereby sending the decoded key data packet to the client, The client can obtain the decoding key data packets required for decoding, improve the success rate of decoding, and improve the decoding efficiency.

Figure 7 describes the structure of a server provided by another embodiment of the present invention, including:

The reading unit 701 is used to read the data packet queue that needs to be sent currently from the data packet buffer pool;

The encoding unit 702 is used to encode the data packets in the data packet queue read by the reading unit 701 through an encoding method based on the fountain coding model to obtain the data packets after the XOR; perform FEC encoding on the data packets after the XOR ;

The sending unit 703 is configured to send to the client the data packet that is FEC-encoded by the encoding unit 702; Include the identification of the key packets needed by the client to decode.

The receiving unit 704 is configured to receive the ARQ request and feedback information from the client during the sending unit 703 sending the FEC-encoded XOR data packet to the client, the feedback information including the information of the successfully decoded data packet logo;

The adjusting unit 705 is configured to adjust the initial position of the sliding window according to the identification of the successfully decoded data packet received by the receiving unit 704 .

As can be seen from the above, when the server in this embodiment sends the FEC-encoded XOR data packet to the client, it may receive an ARQ request from the client requesting to decode the key data packet, thereby sending the decoded key data packet to the client, It enables the client to obtain the decoding key data packets required for decoding, improves the decoding success rate, and can improve the decoding efficiency; and can also receive the feedback information returned by the client including the identification of the successfully decoded data packets, according to the successfully decoded data packets The identification of the data packet adjusts the initial position of the sliding window to avoid continuing to send successfully decoded data packets, and at the same time, it can increase the amount of unsent data packets to provide more effective data packets for client decoding.

Figure 8 describes the structure of a server provided by another embodiment of the present invention, including:

A reading unit 801, configured to read the queue of data packets currently to be sent from the data packet buffer pool;

The encoding unit 802 is used to encode the data packets in the data packet queue read by the reading unit 801 through an encoding method based on the fountain coding model to obtain the data packets after the XOR; perform FEC encoding on the data packets after the XOR ;

The sending unit 803 is configured to send to the client the data packet that is FEC-encoded by the encoding unit 802; Include the identification of the key packets needed by the client to decode.

The receiving unit 804 is configured to receive an ARQ request and feedback information from the client during the process of the sending unit 803 sending the FEC-encoded XORed data packet to the client, the feedback information including the information of the successfully decoded data packet logo;

The adjustment unit 805 is used to adjust the initial position of the sliding window according to the identifier of the successfully decoded data packet received by the receiving unit 804; adjust the window length of the sliding window according to the sliding speed recorded by the recording unit 806;

The recording unit 806 is configured to record the sliding speed of the initial position of the sliding window after the adjusting unit 806 adjusts the initial position of the sliding window according to the identifier of the successfully decoded data packet.

As can be seen from the above, when the server in this embodiment sends the FEC-encoded XOR data packet to the client, it may receive an ARQ request from the client requesting to decode the key data packet, thereby sending the decoded key data packet to the client, It enables the client to obtain the decoding key data packets required for decoding, improves the decoding success rate, and can improve the decoding efficiency; and can also receive the feedback information returned by the client including the identification of the successfully decoded data packets, according to the successfully decoded data packets The identification of the data packet adjusts the initial position of the sliding window to avoid continuing to send successfully decoded data packets. At the same time, it can increase the amount of unsent data packets to provide more effective data packets for client decoding; and it can also record The sliding speed of the initial position of the sliding window, so that the window length of the sliding window is adjusted according to the sliding speed, so that more data packets can be processed effectively.

Introduce the client provided by the embodiment of the present invention again. FIG. 9 describes the structure of a client provided by another embodiment of the present invention, including:

The receiving unit 901 is configured to receive the FEC-encoded XORed data packet from the server; receive the FEC-encoded decoded key data packet from the server;

The decoding unit 902 is configured to perform FEC decoding on the FEC-encoded XORed data packet received by the receiving unit 901 to obtain the XORed data packet;

In another embodiment of the present invention, the decoding unit 902 can also be used to perform FEC decoding on the FEC-encoded decoding key data packet received by the receiving unit 901 to obtain an exclusive-or decoded key data packet; and according to the obtained XOR Decode key data packets after OR and decode data packets after XOR.

A judging unit 903, configured to judge whether the XORed data packet obtained by the decoding unit 902 is a key data packet for decoding;

The sending unit 904 is configured to send an ARQ request to the server when the decoding unit 902 obtains the data packets after the first number of XORs and the judging unit 903 still judges that the key data packets have not been decoded, and the ARQ request includes the identification of the decoded key data packets , causing the server to send decoded key packets.

As can be seen from the above, when the client in this embodiment has obtained the first number of XORed data packets and still has not decoded the key data packets, it sends an ARQ request to the server, thereby prompting the server to send the decoded key data packets, thereby obtaining the decoded key data packets. Decode key data packets as needed, improve decoding success rate, and improve decoding efficiency.

Introduce the client provided by the embodiment of the present invention again. FIG. 10 describes the structure of a client provided by another embodiment of the present invention, including:

The receiving unit 1001 is configured to receive the FEC-encoded XORed data packet from the server; receive the FEC-encoded decoded key data packet from the server;

The decoding unit 1002 is configured to perform FEC decoding on the FEC-encoded XORed data packet received by the receiving unit 1001 to obtain the XORed data packet; perform FEC on the FEC-encoded decoded key data packet received by the receiving unit 1001 Decoding, obtaining the decoded key data packet after XOR; and decoding according to the obtained XOR decoded key data packet and the XOR data packet;

A judging unit 1003, configured to judge whether the XORed data packet obtained by the decoding unit 1002 is a key data packet for decoding;

The sending unit 1004 is configured to send an ARQ request to the server when the decoding unit 1002 has obtained the first number of exclusive-or data packets and the judging unit 1003 still judges that the key data packet has not been decoded, and the ARQ request includes the identification of the decoded key data packet , so that the server sends the decoding key data packet; sends feedback information to the server, the feedback information includes the identification of the successfully decoded data packet obtained by the obtaining unit 1005;

The obtaining unit 1005 is configured to obtain the identification of the data packet successfully decoded by the decoding unit 1002 .

As can be seen from the above, in this embodiment, when the client has obtained the first number of XOR data packets and still has not decoded the key data packets, it sends an ARQ request to the server, thereby prompting the server to send the decoded key data packets, thereby obtaining the decoded key data packets. The key data packets required for decoding can improve the decoding success rate and the decoding efficiency; and the identification of the successfully decoded data packets can be sent to the server, so that the server can adjust the initial value of the sliding window according to the identification of the successfully decoded data packets. Position and window length, to prevent the server from continuing to send successfully decoded data packets, and at the same time increase the amount of unsent data packets to provide more effective data packets for client decoding, so that more data can be processed effectively Bag.

The information interaction and execution process between the above-mentioned devices and modules in the system are based on the same concept as the method embodiment of the present invention, and the specific content can refer to the description in the method embodiment of the present invention, and will not be repeated here.

Those of ordinary skill in the art can understand that all or part of the processes in the methods of the above embodiments can be implemented through computer programs to instruct related hardware. The above programs can be stored in a computer-readable storage medium. During execution, it may include the processes of the embodiments of the above-mentioned methods. Wherein, the above-mentioned storage medium may be a magnetic disk, an optical disk, a read-only memory (ROM: Read-Only Memory) or a random access memory (RAM: Random Access Memory), etc.

In this paper, specific examples are used to illustrate the principle and implementation of the present invention. The description of the above embodiments is only used to help understand the method and thought of the present invention; meanwhile, for those of ordinary skill in the art, according to the present invention Thoughts, specific implementation methods and scope of application all have changes. In summary, the contents of this specification should not be construed as limiting the present invention.

Claims (14)

1. A data transmission method, characterized in that, comprising: Read the current packet queue that needs to be sent from the packet buffer pool; Encoding the data packets in the data packet queue by using a coding method based on the fountain coding model to obtain the data packets after exclusive OR; performing forward error correction coding on the data packet after the XOR; Send the forward error correction coded XOR data packet to the client; If an automatic retransmission request from the client is received during the process of sending the forward error correction coded exclusive-or data packet to the client, then send the forward error correction coded data packet to the client In the decoding of the key data packet, the automatic retransmission request includes the identification of the decoding key data packet required by the client. 2. data transmission method as claimed in claim 1 is characterized in that, adopts the mode of sliding window to read described packet formation; The initial position and the window length of the sliding window are further sent when the forward error correction coded XORed data packet is sent to the client. 3. The data transmission method according to claim 2, characterized in that, in the process of sending the data packet after forward error correction coded XOR to the client, the feedback information from the client is received , the feedback information includes identifiers of successfully decoded data packets; The initial position of the sliding window is adjusted according to the identifiers of the successfully decoded data packets. 4. The data transmission method according to claim 3, wherein after adjusting the initial position of the sliding window according to the identifier of the successfully decoded data packet, further comprising: Record the sliding speed of the initial position of the sliding window; Adjusting the window length of the sliding window according to the sliding speed. 5. A data transmission method, characterized in that, comprising: Receive the FEC-encoded XORed data packet from the server; performing FEC decoding on the XORed data packets that have undergone forward error correction encoding, to obtain the XORed data packets; Judging whether the data packet after the XOR is a decoding key data packet; If the first number of XORed data packets are obtained and the key data packet is still not decoded, an automatic retransmission request is sent to the server, and the automatic retransmission request includes the identifier of the decoded key data packet; and receive the decoded key data packet which has undergone FEC encoding from the server. 6. The data transmission method according to claim 5, further comprising: performing FEC decoding on the decoded key data packets that have undergone forward error correction coding, to obtain the decoded key data packets after XOR; Decoding is performed according to the XORed decoding key data packet and the XORed data packet. 7. The data transmission method according to claim 6, wherein after decoding the key data packet after decoding according to the XOR and the data packet after the XOR, further comprising: Get the ID of a successfully decoded packet; Send feedback information to the server, where the feedback information includes identifiers of data packets that have been successfully decoded. 8. A server, characterized in that it comprises a reading unit, an encoding unit, a sending unit and a receiving unit; wherein: The reading unit is used to read the current data packet queue to be sent from the data packet buffer pool; The encoding unit is configured to encode the data packets in the data packet queue read by the reading unit through an encoding method based on the fountain coding model, so as to obtain the data packets after the XOR; for the data after the XOR The packet is forward error correction encoded; The sending unit is configured to send to the client a data packet that has undergone forward error correction encoding by the encoding unit; The receiving unit receives the automatic retransmission request from the client, and sends the decoded key data packet that has undergone forward error correction encoding to the client, and the automatic retransmission request includes the required information of the client. Decodes the identification of critical packets. 9. The server according to claim 8, wherein the reading unit reads the data packet queue in a sliding window manner; The sending unit further sends the initial position and window length of the sliding window when sending the forward error correction coded XOR data packet to the client. 10. The server according to claim 9, characterized in that, during the process of the sending unit sending the XORed data packet that has been forward error correction coded to the client, the receiving unit receives the data packet from Feedback information from the client, where the feedback information includes identifiers of successfully decoded data packets; The server also includes: An adjustment unit, configured to adjust the initial position of the sliding window according to the identifiers of successfully decoded data packets received by the receiving unit. 11. The server according to claim 10, further comprising: A recording unit, configured to record the sliding speed of the initial position of the sliding window after the adjustment unit adjusts the initial position of the sliding window according to the identifier of the successfully decoded data packet; The adjusting unit is further configured to adjust the window length of the sliding window according to the sliding speed recorded by the recording unit. 12. A client, characterized in that, comprising: The receiving unit is used to receive the XORed data packet from the server after forward error correction coding; A decoding unit, configured to perform FEC decoding on the XORed data packet received by the receiving unit and received by the receiving unit to obtain the XORed data packet; A judging unit, configured to judge whether the XORed data packet obtained by the decoding unit is a key data packet for decoding; A sending unit, configured to send an automatic retransmission request to the server when the decoding unit obtains the first number of XORed data packets and the judging unit still judges that no key data packets have been decoded, and the automatic retransmission The transmission request includes the identification of the decoded key data packet; The receiving unit is further configured to receive the forward error correction coded decoded key data packet from the server. 13. The client according to claim 12, wherein the decoding unit is further configured to perform FEC decoding on the forward error correction encoded decoding key data packet received by the receiving unit, and obtain the XOR Decode the key data packet; perform decoding according to the obtained XORed decoded key data packet and the XORed data packet. 14. The client according to claim 13, further comprising: an acquisition unit, configured to acquire the identifier of the data packet successfully decoded by the decoding unit; The sending unit is further configured to send feedback information to the server, where the feedback information includes identifiers of successfully decoded data packets obtained by the obtaining unit.

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