WO2015062503A1

WO2015062503A1 - Data packet encapsulation method and check method

Info

Publication number: WO2015062503A1
Application number: PCT/CN2014/089784
Authority: WO
Inventors: 张文军; 张娅; 张震宁; 应小青; 项立任; 史梦蕾
Original assignee: 上海数字电视国家工程研究中心有限公司
Priority date: 2013-11-04
Filing date: 2014-10-29
Publication date: 2015-05-07
Also published as: CN106850143A; CN103595504A; CN103595504B; CN106850143B; CN107017966B; CN107017966A

Abstract

A data packet encapsulation method and check method. The data packet encapsulation method comprises: inserting a data packet into one or a plurality of baseband frame data fields, and recording data information regarding the number of times the current data packet to be transmitted has been segmented into blocks; generating a check field for said packet on the basis of an information code of the data packet and the data information regarding the number of times said packet has been segmented into blocks; and, adding the check field onto the end of said information code to complete data packet encapsulation. The present technical solution improves the reliability of data packet transmission over a broadcast communication channel, particularly when a data packet has been segmented into several data blocks carried in different baseband frames.

Description

Data packet encapsulation method and verification method

Technical field

The present invention relates to the field of digital television broadcasting, and in particular, to a data packet encapsulation method and a verification method.

Background technique

The new generation digital TV broadcasting system can support various types of data transmission including audio and video. The specific method is to fill the data packets to be transmitted into the baseband frame data field in turn, and the composition can be performed on the broadcast channel through the digital television broadcasting system. The baseband frame structure of the transmission.

In the process of encapsulating a data packet, when the length of a data packet is large and exceeds the available space of the current data domain, the data packet may be divided into several segments, and each segment is transmitted using a baseband frame. After receiving all the fragments belonging to the data packet, the receiving end re-splices the fragments to obtain the original data packet.

However, due to channel interference and other reasons, the baseband frame may be distorted and error generated during transmission from the transmitting end to the receiving end, so that the data packet obtained by the receiving end after receiving the baseband frame and decoding it will not be original. Packet. In the case of severe channel interference, the receiving end may lose the entire baseband frame or even continuously lose multiple baseband frames.

For errors in a baseband frame, this problem can be largely solved by appending a check field after the packet. However, in the case where a data packet is divided into several data blocks and the data blocks are carried in different baseband frames, if the receiving end loses one of the baseband frames and the data block is missed, only after the data packet The way the checksum field is attached will not solve this problem well.

Summary of the invention

The invention solves the problem that when the data packet is divided into several data blocks and the data blocks are carried in different baseband frames for transmission, the receiving end may miss the data block.

To solve the above problem, an embodiment of the present invention provides a method for encapsulating a data packet, which includes: recording, in a process of sequentially filling a data packet to be currently transmitted into one or more baseband frame data domains, recording the data packet. Data information of the number of blocks; based on the information code of the data packet and the data information of the number of times the data packet is divided to generate a check field of the data packet; the check field is spliced to the end of the information code of the data packet to Complete the encapsulation of the packet.

Optionally, the data to be currently transmitted is sequentially padded to one or more baseband frame data fields, and the data information for recording the number of times the data packet is blocked includes:

Step 1): determining whether the available space of the current baseband frame data field is sufficient to carry the current data packet to be transmitted, where the data packet includes the information code and the length of the reserved check field;

Step 2): If the result of the determination is no, the data packet is segmented to form a first half data block and a second half data block, wherein the first half data block is adapted to fill the available space, the second half Part of the data block will be padded to the next baseband frame data field;

Cycling the above steps 1) and 2) until the available space of the current baseband frame data field is sufficient to carry the data packet to be currently transmitted;

The data information of the number of times the data packet to be transmitted is currently blocked is determined based on the number of loop executions of the above steps 1) and 2).

Optionally, the step of generating the check field of the data packet based on the information code of the data packet and the data information of the data packet by the number of times of the block includes: appending the data information of the data packet to the number of times of the block to End of the information code of the data packet to form a data packet to be verified; processing the data packet to be verified by using a first preset check field generation manner to generate a first check field as the data packet The check field, wherein the first preset check field generation manner is jointly determined by the sending end and the receiving end.

Optionally, the step of generating the check field of the data packet based on the information code of the data packet and the data information of the data packet to be the number of times of the data packet comprises: adopting a first preset check field generation manner to the data The packet is processed to generate intermediate data; the data information of the data packet is added to the end of the intermediate data, and the foregoing data is processed by using a first preset check field generation manner to generate a second check field. And the check field of the data packet is sent by the sending end and the receiving end.

Optionally, the step of generating the check field of the data packet based on the information code of the data packet and the data information of the data packet to be the number of times of the data packet comprises: adopting a first preset check field generation manner to the data Processing the packet to generate intermediate data; processing the intermediate data and the data information of the number of times the packet is blocked by using a second preset check field generation manner to generate a third check field as the data packet a check field; wherein the first preset check field generation manner and the second preset check field generation manner are jointly determined by the sending end and the receiving end.

Optionally, the first preset check field is generated in a cyclic redundancy check manner.

Optionally, the second preset check field generation manner includes any one of an exclusive OR operation, an addition operation, a subtraction operation, and a multiplication operation.

The embodiment of the present invention further provides a data packet verification method, where the data packet is encapsulated according to the encapsulation method of the foregoing data packet, and then padded to a baseband frame and transmitted in a channel, and then recovered at the receiving end, the verification method is obtained. include:

Acquiring a complete data packet from one or more baseband frame data fields, the complete data packet including an information code and a check field;

And according to the preset check field generation manner and the check field length of the flag in the check algorithm flag bit in the baseband frame header, the check field is intercepted from the end of the data packet, and the remaining content of the data packet is used as the information code;

Performing a check calculation on the information code of the received data packet and the data information of the number of times the data packet is blocked to obtain a check field to be compared;

Comparing whether the check field to be compared is consistent with the obtained check field;

If the two are consistent, it is determined that the data packet is received correctly.

Optionally, the obtaining the complete data packet from the one or more baseband frame data domains includes the following steps:

Reading a data packet sequentially from a starting position of a current baseband frame data field, wherein the starting position is determined by a starting position field in a baseband frame header;

Whether the data packet is completely carried in the current baseband frame data field by whether the packet length field at the packet header is zero or not;

If the data packet is not completely carried in the current baseband frame data, all data starting from the start position of the current baseband frame to the end of the data field is used as the first block of the data packet, and continues from several subsequent baseband frame data. The remaining blocks of the data packet are read in the domain and spliced in sequence with the first block of the data packet to obtain an information code and a check field of the data packet, wherein the remaining partition of the data packet is based on a baseband frame frame. The relationship between the start position field and the data field length field in the header is determined;

If the data packet is completely carried in the current baseband frame data, the information code and the check field of the data packet are obtained from the start position of the current baseband frame data field and according to the packet length of the data packet header;

Recording the information code of the data packet and the number of baseband frames of the check field to determine data information of the number of times the data packet is blocked;

Optionally, the remaining partition of the data packet is determined according to a relationship between a start location field and a data domain length field in a baseband frame header, and includes the following situations:

1) If the start position field in a baseband frame header is larger than the data field length field, it is determined that the baseband frame data field is all used to carry one data block in the remaining block of the data packet, and the data packet is transmitted. undone;

2) If the start position field in a baseband frame header is equal to the data field length field, it is determined that the baseband frame data field is all used to carry the data packet, and the transmission of the data packet has been completed;

3) If the start position field in a baseband frame header is smaller than the data field length field, the data between the baseband base data field header and the start position is the last data in the remaining partition of the data packet. Piece.

The embodiment of the present invention further provides a data packet transmission method, including: sequentially filling a data packet to be currently transmitted into one or more baseband frame data fields; generating a verification field of the data packet, where the verification The field is determined according to the information code of the data packet and the data information of the number of times of the data packet being filled in the baseband frame data field; the check field is spliced to the end of the information code of the data packet to complete the Encapsulation of the data packet; transmitting one or more baseband frames carried in the data packet to the receiving end via the channel.

Compared with the prior art, the technical solution of the present invention has the following beneficial effects:

According to the data packet encapsulation method provided by the embodiment of the present invention, when generating the check field of the data packet, the data information of the number of times of blocking the data packet into the baseband frame data domain is considered, so that the receiving end receives the data information. During the parsing process of the data packet, the data packet of the number of times the data packet is blocked is also used to check whether the data packet is correctly received, thereby improving the data packet (especially the data packet is divided into several data blocks and carried in different In the case of a baseband frame) reliability in the transmission of a broadcast communication channel.

According to the verification method of the data packet provided by the embodiment of the present invention, in the process of reading the data packet from the received baseband frame data field, the receiving end determines whether the data packet is complete by the packet length field located in the packet header. The data is carried in the current baseband frame data field, and the complete data packet and the check field are obtained in different manners for different situations, and when the received data packet is verified, the data packet is considered to be blocked. The data information of the number of times, thereby improving the reliability of the data packet when transmitted on the broadcast communication channel.

DRAWINGS

1 is a schematic flow chart of a specific implementation manner of a method for packaging a data packet according to the present invention;

2 is a schematic diagram showing the basic structure of a baseband frame formed by encapsulating a data packet;

3A is a schematic diagram of a baseband frame structure in which a data packet is not divided and packaged;

FIG. 3B is a schematic diagram of a baseband frame structure encapsulated in a case where each data block is respectively carried in a different baseband frame after the data packet is divided; FIG.

4 is a schematic flow chart of a specific implementation manner of a method for verifying a data packet according to the present invention.

detailed description

The inventors have found that in the prior art, when the data packet is divided into several data blocks and the data blocks are carried in different baseband frames for transmission, if the receiving end loses one of the baseband frames, the data block receiving error will be caused. .

In view of the above problems, the inventors have provided a data packet encapsulation method and a verification method by improving the data packet by considering the data information of the number of times the data packet is blocked in the process of encapsulating the data packet. It is the reliability of the data packet being divided into several data blocks carried in different baseband frames during transmission of the broadcast communication channel.

The above described objects, features and advantages of the present invention will become more apparent from the aspects of the invention.

FIG. 1 is a schematic flow chart of a specific implementation manner of a method for packaging a data packet according to the present invention. Referring to FIG. 1, the method for packaging a data packet includes the following steps:

Step S11: in the process of sequentially filling the data packet to be transmitted into one or more baseband frame data fields, recording data information of the number of times the data packet is blocked;

Step S12: generating an check field of the data packet based on the information code of the data packet and the data information of the data packet being blocked.

Step S13: splicing the check field to the end of the information code of the data packet to complete the encapsulation of the data packet.

Different from the prior art, when generating the check field of the data packet, not only the information code itself of the data packet, but also the data information of the number of times the data packet is blocked in the process of filling into one or more baseband frame data fields is further considered. . For example, when a data packet is divided into three data blocks in the process of filling into the baseband frame data field, the data information of the number of times of blocking is twice.

In a specific embodiment, as described in step S11, in the process of sequentially filling the data packet to be transmitted into one or more baseband frame data fields, the data information of the number of times the data packet is blocked is recorded, which specifically includes the following. step:

Step 2): If the result of the determination is no, the data packet is segmented to form a first half data block and a second half data block, wherein the first half data block is adapted to fill the available space, the second half Part of the data block will be padded to the next baseband frame data field.

In the above step 1), it is determined whether the available space is sufficient to carry the data packet by comparing the size relationship between the data field length occupied by the available space of the current baseband frame data field and the length of the current data packet to be transmitted. It should be noted that, in this step, the location of the check field needs to be reserved after the information code of the data packet, for example, a length of 2 bytes is reserved, and the reserved position is filled with zeros, so the length of the data packet includes Information code and reserved check field length.

As described in step 2), if the packet length of the data packet is greater than the data domain length occupied by the available space of the current baseband frame data field, it is determined that the current baseband frame data field is insufficient to carry the entire data packet, and the data packet needs to be Split. The divided data packet is divided into a first half data block and a second half data block, wherein the first half data block can fill the available space, and the remaining second half data block is filled into the next baseband frame data field.

For the second half of the data block, it will continue to judge according to the above step 1), that is, continue to determine whether the second half of the data block is sufficient to be carried in the current baseband frame data field (relative to the next baseband frame of the previous baseband frame) ). When the result of the determination is no, the second half of the data block is further divided into two partial data blocks according to the above step 2), and the first half of the data blocks in the two partial data blocks can fill the baseband frame data. The available space of the domain, the second half of the data block will be filled into the next baseband frame data field.

The above steps 1) and 2) are performed cyclically until the available space of the current baseband frame data field is sufficient to carry the last remaining data block.

Further, data information of the number of times the data packet to be transmitted is currently blocked may be determined according to the number of loop executions in the entire process. For example, if step 1) and step 2) are performed twice in a loop, it can be determined that the current data packet to be transmitted is split twice, and the data packet is divided into three data blocks respectively carried in three consecutive basebands. In the frame data field.

If the result of the foregoing step 1) is yes, that is, the available space of the current baseband frame data field is sufficient to carry the data packet to be currently transmitted, the data packet does not need to be divided (that is, the data information of the number of times of blocking is 0) ), the packet will be completely carried in the current baseband frame data field.

Then, as described in step S12, the information code of the data packet and the data information of the number of times the data packet is divided are used to generate a check field of the data packet. As described in step S13, the check field is spliced to the end of the information code of the data packet to complete the encapsulation of the data packet.

In the prior art, when generating a check field of a data packet, only the information code of the data packet is involved in the operation of generating the check field, and in this embodiment, the number of times the data packet is blocked is further considered. Data information. Specifically, the embodiment includes the following three specific examples:

1) In a specific embodiment, the step S12 includes the following steps:

And appending the data information of the data packet to the end of the information code of the data packet to form a data packet to be verified;

The data packet to be checked is processed to generate a check field by using a first preset check field generation manner, where the first preset check field generation manner is jointly determined by the sending end and the receiving end.

For example, CHK=F(DATA,SEG)=H([DATA,SEG]), where CHK is the calculated check field; DATA is the information code of the data packet; SEG is the data information of the number of times the data packet is blocked, H(x) is the first preset check field generation manner.

Correspondingly, the step S13 comprises the step of splicing the first check field to the end of the information code of the data packet to complete the encapsulation of the data packet.

2) In another specific implementation of this step, the step S12 includes the following steps:

Processing the data packet by using a first preset check field generation manner to generate intermediate data;

Adding the data information of the data packet to the end of the intermediate data, and processing the foregoing data by using a first preset check field generation manner to generate a second check field;

The manner of generating the first preset check field is jointly determined by the sending end and the receiving end.

For example, CHK=F(DATA,SEG)=H([H(DATA),SEG]), where CHK is the calculated check field; DATA is the information code of the data packet, H(DATA) is the intermediate data; SEG For the data information of the number of times the data packet is blocked, H(x) is the first preset check field generation manner.

Correspondingly, the step S13 comprises the step of splicing the second check field to the end of the information code of the data packet to complete the encapsulation of the data packet.

3) In another specific implementation of this step, the step S12 includes the following steps:

Processing, by using a first preset check field generation manner, an information code of the data packet to generate intermediate data;

And processing, by using a second preset check field generation manner, the intermediate data and the data information of the number of times the data packet is blocked to generate a third check field;

The manner of generating the first preset check field and the generating manner of the second preset check field are jointly determined by the sending end and the receiving end.

For example, CHK=F(DATA,SEG)=G(H(DATA), SEG), where CHK is the calculated check field; DATA is the information code of the data packet; SEG is the data information of the number of times the data packet is blocked. H(x) is the first preset check field generation manner.

G(x, y) is the second preset check field generation mode. In practical applications, G(x, y) can be a commonly used function that can receive two input data, such as the function G of the exclusive OR operation (x). , y) = x XOR y, the function of the addition operation G(x, y) = x + y, the function of the subtraction function G (x, y) = x - y or the function of the multiplication operation G (x, y) = x*y.

Correspondingly, the step S13 comprises the step of splicing the third check field to the end of the information code of the data packet to complete the encapsulation of the data packet.

In the above three specific implementation manners, the first preset check field is generated in a cyclic redundancy check, that is, a CRC check.

FIG. 2 is a schematic diagram showing the basic structure of a baseband frame formed by encapsulating a data packet. Referring to FIG. 2, the baseband frame includes a baseband frame header, a data field, and an area for zero-fill and in-band signaling.

The baseband frame header includes a MATYPE (MediaType) field (2 bytes), a DFL (DataFieldLength) field (2 bytes), a SYNCD (Synchronization Data) field (2 bytes), an INDICATORS field (1 byte), and a CRC-8 field (1 byte). The INDICATORS field also includes a CRCI (CRC-Indicator) field (2 bits) and other fields (6 bits). The data field is used to fill each data packet, and the data packet may be an IP data packet or a TS data stream packet.

As shown in FIG. 3A, a schematic diagram of a baseband frame structure in which a data packet is not divided and packaged is shown. Referring to FIG. 3A, the baseband frame includes a baseband frame header and a data field. A plurality of data packets (such as a data packet N and a data packet N+1) are carried in the data domain, and the data packet is encapsulated in the data packet of each data packet according to the encapsulation method of the data packet provided by the technical solution (not The respective check fields are spliced at the end, for example, packet N and check field N, packet N+1, and check field N+1. These data packets are carried in a baseband frame data field.

FIG. 3B is a schematic diagram of a baseband frame structure encapsulated in a case where data packets are respectively divided into different baseband frames after the data packet is divided. Referring to FIG. 3B, the data packet N is divided into three data blocks, namely, a data block 1, a data block 2, and a data block 3, which are respectively carried in consecutive three baseband frame data fields. Each baseband frame includes a baseband frame header and a data field. The check field N of the data packet (i.e., packet N) is spliced at the end of the information code of the data block 3.

The transmitting end will encapsulate the data packet into a baseband frame by using the data packet encapsulation method provided by the technical solution, and then transmit each baseband frame to the receiving end via the broadcast communication channel, and the receiving end parses the data from the received baseband frame. Packet, and check whether the reception of each packet is correct.

The method for verifying a data packet is provided by the data packet encapsulation method provided by the foregoing embodiment, and is encapsulated into a baseband frame and transmitted in a channel, and then recovered at the receiving end. FIG. 4 is a schematic flowchart diagram of a specific implementation manner of a method for verifying a data packet according to the present invention.

Referring to FIG. 4, the verification method of the data packet includes the following steps:

Step S21: sequentially reading a data packet from a starting position of a current baseband frame data field, where the starting position is determined by a starting position field in a baseband frame header;

Step S22: determining whether the data packet is completely carried in the current baseband frame data field by whether the packet length field located at the packet header is zero.

Step S23: If the data packet is not completely carried in the current baseband frame data, all the data starting from the start position of the current baseband frame to the end of the data field is used as the first block of the data packet, and continues from the subsequent several. Reading the remaining blocks of the packet in the baseband frame data field and sequentially entering the first block of the packet Row stitching to obtain an information code and a check field of the data packet, wherein the remaining partition of the data packet is determined according to a relationship between a start position field and a data field length field in a baseband frame header;

Step S24: If the data packet is completely carried in the current baseband frame data, start from the starting position of the current baseband frame data field and obtain the information code and check field of the data packet according to the packet length of the data packet header. ;

Step S25: recording the number of baseband frames of the information code and the check field of the assembled data packet to determine the data information of the number of times the data packet is blocked;

Step S26: According to the preset check field generation manner and the check field length of the flag in the check algorithm flag bit in the baseband frame header, the check field is intercepted from the end of the data packet, and the remaining content of the data packet is used as the information code. ;

Step S27: performing a check calculation on the received data packet information code and the data information of the number of times the data packet is blocked to obtain a check field to be compared;

Step S28: Comparing whether the check field to be compared is consistent with the obtained check field

Step S29: If the two are consistent, it is determined that the data packet is received correctly.

In this embodiment, as described in step S21, the data packet is sequentially read from the start position of the current baseband frame data field.

In practical applications, after receiving a series of consecutive baseband frames, the receiving end reads the first complete data packet from the beginning of the first baseband frame data field according to the received sequence. The starting position is determined by a starting position field in the baseband frame header (such as the SYNCD field in FIG. 2), and the receiving end can determine the starting position of the data packet stored in the data field according to the information recorded in the SYNCD field. .

As described in step S22, it is determined whether the data packet is completely carried in the current baseband frame data field by whether the packet length field located at the packet header is zero.

In this embodiment, a packet length field is set in the header of the data packet for recording the packet length of the data packet. In the case where the data packet is completely carried in a baseband frame data field, the packet length field records the packet length of the entire data packet; and when the data packet is not completely carried in a baseband frame data field, the packet The long field is set to zero by default. Therefore, the receiving end can determine whether the data packet is completely carried in the current baseband frame data field by reading the packet length field located at the head of the data packet according to whether the value recorded by the receiver is zero.

As described in step S23, if the data packet is not completely carried in the current baseband frame data, all data starting from the start position of the current baseband frame to the end of the data field is used as the first block of the data packet, and continues from the subsequent block. The plurality of baseband frame data fields read the remaining blocks of the data packet and sequentially spliced with the first block of the data packet to obtain an information code and a check field of the data packet.

In the case that the data packet is long and is not completely carried in a baseband frame data field, the receiving end needs to extract each data block belonging to the data packet from several baseband frames, and each data block belonging to the same data packet will be It is carried in several consecutive baseband frames. Therefore, after receiving the first data block of the data packet from the current baseband frame start position to the end of the data field, the receiving end will continue to read the remaining partition of the data packet from the subsequent baseband frame data field.

Further, the remaining partition of the data packet is determined according to a relationship between a start position field and a data field length field in a baseband frame header. Specifically, the receiving end determines the total of the data fields recorded by the start position of the baseband frame data field and the data field length field (ie, the DFL field in FIG. 2) recorded in the start position field in the baseband frame header. The size relationship between the lengths to determine if the last data block of the packet has been acquired.

Specifically, the following situations are included:

1) If the start position field in a baseband frame header is larger than the data field length field, it is determined that the baseband frame data field is all used to carry one data block in the remaining block of the data packet, and the data packet is transmitted. undone. The receiving end will continue to retrieve the remaining data blocks from the subsequent baseband frame data field.

2) If the start position field in a baseband frame header is equal to the data field length field, it is determined that the baseband frame data field is all used to carry the data packet, and the transmission of the data packet has been completed.

As described in step S24, if the data packet is completely carried in the current baseband frame data, the information code of the data packet is obtained from the start position of the current baseband frame data field and according to the packet length of the packet header. Check the field.

The length information of the information code of the data packet can be obtained by directly or indirectly through the length field of the data packet header, and the length of the check field is obtained according to the agreement between the sending end and the receiving end for the check field calculation algorithm.

As described in step S25, the number of baseband frames in which the information code of the data packet and the check field are assembled is recorded to determine the data information of the number of times the data packet is blocked.

In this embodiment, when the receiving end subsequently checks the received data packet, it needs to consider the data information of the number of times the data packet is blocked. Therefore, after obtaining the complete data packet, the receiving end also needs to record the number of baseband frames in which the information code of the data packet and the check field are assembled.

In the case that the data packet is not completely carried in the current baseband frame data field, the receiving end can record a total of several baseband frames in the process of acquiring the entire data packet, so that it can be determined that the data packet is divided into several data blocks. And thereby determining the data information of the number of times the packet is blocked. For the case where the data packet is completely carried in the current baseband frame data field, the data information of the number of times of blocking is zero.

As described in step S26, the preset check field generation mode and the check field length of the flag in the check algorithm flag bit (ie, the CRCI field in FIG. 2) in the baseband frame header are intercepted from the end of the data packet. The check field, the remaining content of the data packet as the information code.

Specifically, the entire data packet obtained by the receiving end includes an information code and a check field, and the two are combined. Therefore, the receiving end needs to separately obtain the information code and the check field from it. The length of the check field may be determined according to a preset check field generation manner and a check field length of the flag in the check algorithm flag bit in the baseband frame header. The information code of the data packet is after the check field is intercepted. The rest of the content.

As described in step S27, the received data packet information code and the data information of the number of times the data packet is blocked are subjected to check calculation to obtain a check field to be compared.

Specifically, the receiving end performs a check operation on the information code of the received data packet in combination with the data information of the number of times the data packet is blocked according to the foregoing step S25, to obtain a check field to be compared. The specific implementation process of the check operation is determined according to a preset check field generation manner of a flag in a check algorithm flag bit in a baseband frame header. And for the same data packet, the sender and the receiver use the same preset check field generation manner to process the information code of the data packet to obtain the check field respectively.

For the different preset check field generation manners, refer to the embodiment of step S12 in the embodiment described in FIG. 1 for the manner of processing the information code of the data packet, and details are not described herein again.

As described in step S28, it is compared whether the check field to be compared and the obtained check field are consistent.

As described in step S29, if the two are consistent, it is determined that the data packet is received correctly. On the other hand, if the two are inconsistent, it is determined that the packet is received incorrectly.

The embodiment of the invention further provides a method for transmitting a data packet, which specifically includes the following steps:

Step S31: sequentially filling the data packet to be currently transmitted into one or more baseband frame data fields;

Step S32: Generate a check field of the data packet, where the check field is determined according to the information code of the data packet and the data information of the number of times of blocking of the data packet in the process of filling the data field into the baseband frame;

Step S33: splicing the check field to the end of the information code of the data packet to complete the encapsulation of the data packet;

Step S34: The data packet is carried in one or more baseband frames and transmitted to the receiving end via a channel.

In summary, according to the data packet encapsulation method and the verification method provided by the technical solution, when the sending end generates the check field of the data packet, the transmitting end considers the data of the number of times of blocking in the process of filling the data packet into the baseband frame data domain. Information, so that in the process of parsing the received data packet at the receiving end, the data packet of the number of times the data packet is blocked is also used to check whether the data packet is correctly received, thereby improving the data packet (especially the data packet). The reliability when transmitting a communication channel is divided into several data blocks that are carried in different baseband frames.

The present invention has been disclosed in the preferred embodiments as described above, but it is not intended to limit the invention, and the present invention may be utilized by the method and technical contents disclosed above without departing from the spirit and scope of the invention. The technical solutions make possible changes and modifications. Therefore, any simple modifications, equivalent changes, and modifications made to the above embodiments in accordance with the technical spirit of the present invention are not included in the technical solutions of the present invention. protected range.

Claims

A method for packaging a data packet, comprising:

In the process of sequentially filling the data packet to be transmitted into one or more baseband frame data fields, recording data information of the number of times the data packet is blocked;

Generating a check field of the data packet based on the information code of the data packet and the data information of the data packet being blocked.

The check field is spliced to the end of the information code of the data packet to complete the encapsulation of the data packet.
The method for encapsulating a data packet according to claim 1, wherein the data to be currently transmitted is sequentially padded to one or more baseband frame data fields, and the data information for recording the number of times the data packet is blocked includes:

Step 1): determining whether the available space of the current baseband frame data field is sufficient to carry the current data packet to be transmitted, where the data packet includes the information code and the length of the reserved check field;

Step 2): If the result of the determination is no, the data packet is segmented to form a first half data block and a second half data block, wherein the first half data block is adapted to fill the available space, the second half Part of the data block will be padded to the next baseband frame data field;

Cycling the above steps 1) and 2) until the available space of the current baseband frame data field is sufficient to carry the data packet to be currently transmitted;

The data information of the number of times the data packet to be transmitted is currently blocked is determined based on the number of loop executions of the above steps 1) and 2).
The method of encapsulating a data packet according to claim 1, wherein the step of generating the check field of the data packet based on the information code of the data packet and the data information of the data packet by the number of times of the data packet comprises:

And appending the data information of the data packet to the end of the information code of the data packet to form a data packet to be verified;

Processing the to-be-checked data packet by using a first preset check field generation manner to generate a first check field as the check field of the data packet, where the first preset check field is generated The mode is determined jointly by the sender and the receiver.
The method of encapsulating a data packet according to claim 1, wherein the step of generating the check field of the data packet based on the information code of the data packet and the data information of the data packet by the number of times of the data packet comprises:

Processing the data packet by using a first preset check field generation manner to generate intermediate data;

The data information of the data packet is added to the end of the intermediate data, and the foregoing data is processed by using a first preset check field generation manner to generate a second check field as the data packet. Check field

The manner of generating the first preset check field is jointly determined by the sending end and the receiving end.
The method of encapsulating a data packet according to claim 1, wherein the step of generating the check field of the data packet based on the information code of the data packet and the data information of the data packet by the number of times of the data packet comprises:

Processing the data packet by using a first preset check field generation manner to generate intermediate data;

And processing, by using a second preset check field generation manner, the intermediate data and the data information of the data packet to be blocked to generate a third check field as the check field of the data packet;

The manner of generating the first preset check field and the generating manner of the second preset check field are jointly determined by the sending end and the receiving end.
The method for encapsulating a data packet according to claim 3 or 4 or 5, wherein the first preset check field is generated in a cyclic redundancy check.
The method of encapsulating a data packet according to claim 5, wherein the second preset check field generation mode comprises any one of an exclusive OR operation, an addition operation, a subtraction operation, and a multiplication operation.
A method for verifying a data packet, wherein the data packet is encapsulated by the encapsulation method of the data packet according to claim 1, and then filled into a baseband frame and transmitted in a channel, and then recovered at the receiving end, and the verification is performed. Methods include:

Acquiring a complete data packet from one or more baseband frame data fields, the complete data packet including an information code and a check field;

And according to the preset check field generation manner and the check field length of the flag in the check algorithm flag bit in the baseband frame header, the check field is intercepted from the end of the data packet, and the remaining content of the data packet is used as the information code;

Performing a check calculation on the information code of the received data packet and the data information of the number of times the data packet is blocked to obtain a check field to be compared;

Comparing whether the check field to be compared is consistent with the obtained check field;

If the two are consistent, it is determined that the data packet is received correctly.
The method for verifying a data packet according to claim 8, wherein said obtaining a complete data packet from one or more baseband frame data fields comprises the following steps:

Reading a data packet sequentially from a starting position of a current baseband frame data field, wherein the starting position is determined by a starting position field in a baseband frame header;

Whether the data packet is completely carried in the current baseband frame data field by whether the packet length field at the packet header is zero or not;

If the data packet is not completely carried in the current baseband frame data, all data starting from the start position of the current baseband frame to the end of the data field is used as the first block of the data packet, and continues from several subsequent baseband frame data. The remaining blocks of the data packet are read in the domain and spliced in sequence with the first block of the data packet to obtain an information code and a check field of the data packet, wherein the remaining partition of the data packet is based on a baseband frame frame. The relationship between the start position field and the data field length field in the header is determined;

If the data packet is completely carried in the current baseband frame data, from the current baseband frame data field Starting a position and obtaining an information code and a check field of the data packet according to a packet length of the packet header;

Recording the information code of the data packet and the number of baseband frames of the check field are assembled to determine the data information of the number of times the data packet is blocked.
The method for verifying a data packet according to claim 8, wherein said remaining block of said data packet is determined to be included according to a relationship between a start position field and a data field length field in a baseband frame header. The following situation:

1) If the start position field in a baseband frame header is larger than the data field length field, it is determined that the baseband frame data field is all used to carry one data block in the remaining block of the data packet, and the data packet is transmitted. undone;

2) If the start position field in a baseband frame header is equal to the data field length field, it is determined that the baseband frame data field is all used to carry the data packet, and the transmission of the data packet has been completed;

3) If the start position field in a baseband frame header is smaller than the data field length field, the data between the baseband base data field header and the start position is the last data in the remaining partition of the data packet. Piece.
A method for transmitting a data packet, comprising:

The data packet to be currently transmitted is sequentially padded to one or more baseband frame data fields;

Generating a check field of the data packet, wherein the check field is determined according to an information code of the data packet and data information of a number of times of blocking of the data packet in a process of filling into a baseband frame data field;

Splicing the check field to the end of the information code of the data packet to complete the encapsulation of the data packet;

The data packet is carried on one or more baseband frames and transmitted to the receiving end via a channel.