CN111541521B - Data packet length identification method and system - Google Patents
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- CN111541521B CN111541521B CN202010377474.3A CN202010377474A CN111541521B CN 111541521 B CN111541521 B CN 111541521B CN 202010377474 A CN202010377474 A CN 202010377474A CN 111541521 B CN111541521 B CN 111541521B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
- H04L1/0006—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the transmission format
- H04L1/0007—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the transmission format by modifying the frame length
- H04L1/0008—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the transmission format by modifying the frame length by supplementing frame payload, e.g. with padding bits
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Abstract
The invention provides a method and a system for identifying the length of a data packet, wherein the method comprises the following steps: s1, filling a data frame based on preset filling bits, wherein the number of the filling bits is determined by the bit length of a data packet and the load length of the data frame, and the numerical value of the filling bits is determined by the numerical value of the tail bit of the data packet; and S2, sending the filled data frame to a receiving end so that the receiving end can identify the filling bit and determine the length of the data packet according to the numerical value of the filling bit. According to the method and the system for identifying the length of the data packet, the filling bits are filled when the data frame is sent, so that the length of the data packet can be effectively identified at a receiving end according to the numerical value of the filling bits.
Description
Technical Field
The present invention relates to the field of data frame structure processing technologies, and in particular, to a method and a system for identifying a packet length.
Background
The method for identifying the data frame structure and the data packet length in the communication system is to put the bits in the data packet after the Header (Header) of the data frame, to mark the length of the data packet bits with a string of binary bits in the Header, and to identify and extract the data packet bits in the data frame by reading the length of the data packet bits marked in the Header of the data frame at the receiving end. However, when there are various fixed choices for the length of the data frame, and the transmitted data packet is a short packet and the length is arbitrary, the above-mentioned conventional method may cause a large overhead of the header in the data frame.
Therefore, a new method for identifying the length of a data packet is needed to solve the above problem.
Disclosure of Invention
The present invention provides a method and system for identifying a packet length, which overcomes or at least partially solves the above problems, and according to a first aspect of the present invention, the present invention provides a method for identifying a packet length, comprising:
s1, filling a data frame based on preset filling bits, wherein the number of the filling bits is determined by the bit length of a data packet and the load length of the data frame, and the numerical value of the filling bits is determined by the numerical value of the tail bit of the data packet;
and S2, sending the filled data frame to a receiving end so that the receiving end can identify the filling bit and determine the length of the data packet according to the numerical value of the filling bit.
Wherein the S1 comprises:
acquiring the value of the tail bit of the data packet to determine the value of the padding bit;
marking the filling bits in a frame header of the data frame;
acquiring the bit length of a data packet and the load length of a data frame, and determining the number of the filling bits;
and filling the filling bits at the tail part of the data packet according to the number.
When filling data frame, determining the shortest data frame length in a group of given data frame lengths, wherein the load length of the data frame is larger than or equal to the data packet length.
Wherein the obtaining the value of the last bit of the data packet to determine the value of the padding bit includes:
if the value of the tail bit of the data packet is 1, the value of the padding bit is 0;
and if the value of the tail bit of the data packet is 0, the value of the padding bit is 1.
Wherein, the obtaining the data packet bit length and the data frame payload length, and determining the number of the padding bits, includes:
acquiring a data packet bit length A and a data frame load length B for bearing a data packet;
and calculating the difference value of the B and the A as the number of the padding bits.
Wherein, the filling and sending process of the data frame comprises the following steps:
splitting the data frame into a plurality of data blocks with fixed lengths, wherein the number of the data blocks is determined by the length of the data frame;
and sending the plurality of data blocks to the receiving end so that the receiving end can splice the data blocks after receiving the data blocks to obtain the data frame.
According to a second aspect of the present invention, the present invention further provides a method for identifying a packet length, including:
s3, receiving the filled data frame sent by the sending end;
and S4, identifying filling bits in the data frame, and determining the length of the data packet according to the numerical values of the filling bits.
Wherein the S4 comprises:
reading filling bits in a frame header of the data frame, and determining the numerical values of the filling bits;
determining the value of the tail bit of the data packet by the padding bit;
and searching a first target bit taking the value as the value of the tail bit of the data packet from the tail bit of the data frame load, taking the position of the target bit as the position of the tail bit of the data packet, and extracting the initial bit of the data frame load to the target bit as the data packet.
According to a third aspect of the present invention, a transmitting end of a packet length recognition system includes:
the device comprises a filling module, a data frame processing module and a data frame processing module, wherein the filling module is used for filling a data frame based on preset filling bits, the number of the filling bits is determined by the bit length of a data packet and the load length of the data frame, and the numerical value of the filling bits is determined by the numerical value of the tail bit of the data packet;
and the sending module is used for sending the filled data frame to a receiving end so that the receiving end can identify the filling bit and determine the length of the data packet according to the numerical value of the filling bit.
According to a fourth aspect of the present invention, the present invention provides a receiving end of a packet length recognition system, including:
the receiving module is used for receiving the filled data frame sent by the sending end;
and the identification module is used for identifying the filling bits in the data frame and determining the length of the data packet according to the numerical values of the filling bits.
The method and the system for identifying the length of the data packet provided by the embodiment of the invention can effectively identify the length of the data packet at a receiving end according to the numerical value of the filling bit by filling the filling bit when the data frame is sent.
Drawings
Fig. 1 is a schematic flow chart of a method for identifying a packet length according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of data frame stuffing provided by an embodiment of the present invention;
fig. 3 is a schematic flowchart of another method for identifying a packet length according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of a transmitting end of a packet length identification system according to an embodiment of the present invention;
fig. 5 is a schematic diagram of a receiving end structure of a data packet length recognition system according to an embodiment of the present invention;
fig. 6 is a schematic structural diagram of an electronic device according to an embodiment of the present invention.
Detailed Description
The following detailed description of embodiments of the present invention is provided in connection with the accompanying drawings and examples. The following examples are intended to illustrate the invention but are not intended to limit the scope of the invention.
Fig. 1 is a schematic flow chart of a method for identifying a packet length according to an embodiment of the present invention, as shown in fig. 1, including:
s1, filling a data frame based on preset filling bits, wherein the number of the filling bits is determined by the bit length of a data packet and the load length of the data frame, and the numerical value of the filling bits is determined by the numerical value of the tail bit of the data packet;
and S2, sending the filled data frame to a receiving end so that the receiving end can identify the filling bit and determine the length of the data packet according to the numerical value of the filling bit.
It should be noted that, the execution main body in the embodiment of the present invention is a sending end, and it can be understood that, for each sending process of a data packet, the method provided in the embodiment of the present invention can be used, so that a receiving end can accurately identify a length of the data packet.
Specifically, in step S1, the embodiment of the present invention is different from the prior art, the structure of the data frame is improved, the data frame is filled, the content of the filling is referred to as a filling bit in the embodiment of the present invention, fig. 2 is a schematic diagram of the filling of the data frame provided in the embodiment of the present invention, as shown in fig. 2, the embodiment of the present invention adds an extra bit number at the end of the data packet, the bit is referred to as a filling bit in the embodiment of the present invention, and at the same time, the filling bit is also marked with a bit in the header of the data packet. Further, the number of the padding bits is determined by the data packet bit length and the data frame payload length, and the value of the padding bits is determined by the value of the last bit of the data packet.
In step S2, after the data frame is filled, the data frame is sent to the receiving end, the receiving end confirms the value of the filling bit by identifying the filling bit in the frame header after receiving the data frame, and then searches for a bit having a value different from that of the filling bit from the last bit of the data frame load.
According to the method for identifying the length of the data packet provided by the embodiment of the invention, the filling bits are filled when the data frame is sent, so that the length of the data packet can be effectively identified at a receiving end according to the numerical value of the filling bits.
On the basis of the above embodiment, the S1 includes:
acquiring the value of the tail bit of the data packet to determine the value of the padding bit;
marking the filling bits in a frame header of the data frame;
acquiring the bit length of a data packet and the load length of a data frame, and determining the number of the filling bits;
and filling the filling bits at the tail part of the data packet according to the number.
As can be seen from the content of the above embodiment, the embodiment of the present invention will fill the padding bits into the data frame, so as to improve the data frame structure, and the specific improvement steps can be divided into 4 steps:
s11, obtaining the value of the tail bit of the data packet to determine the value of the padding bit;
s12, marking the filling bits in the frame header of the data frame;
s13, acquiring the bit length of a data packet and the load length of a data frame, and determining the number of the filling bits;
and S14, filling the filling bits at the tail part of the data packet according to the number.
Specifically, when there is a group of data frame lengths, the shortest data frame length is determined, and when the load length of the data frame is greater than the data packet length, it is determined that padding bits can be padded, and the padding process is as shown in S11-S14, so as to finally obtain the padded data frame.
On the basis of the above embodiment, when a data frame is padded, the shortest one of a set of predetermined data frame lengths is determined, and the payload length of the data frame is equal to or greater than the packet length.
On the basis of the foregoing embodiment, the obtaining the value of the last bit of the data packet to determine the value of the padding bit includes:
if the value of the tail bit of the data packet is 1, the value of the padding bit is 0;
and if the value of the tail bit of the data packet is 0, the value of the padding bit is 1.
As can be seen from the above description, in the embodiment of the present invention, the value of the padding bit is determined according to the value of the last bit of the data packet, where the value of the bit is a binary number, which is equivalent to that there are two scenarios, i.e., a scenario with a value of 0 and a scenario with a value of 1. When the value of the last bit of the data packet is 1, the value of the padding bit needs to be set to 0, and when the value of the last bit of the data packet is 0, the value of the padding bit needs to be set to 1, so that the value of the padding bit is determined.
On the basis of the foregoing embodiment, the obtaining the packet bit length and the data frame payload length, and determining the number of padding bits includes:
acquiring a data packet bit length A and a data frame load length B for bearing the data packet;
and calculating the difference value of the B and the A as the number of the padding bits.
As can be seen from the content of the foregoing embodiment, the number of padding bits is determined according to the data packet bit length and the data frame load length in the embodiment of the present invention, specifically, first, the data packet bit length a is obtained and generally denoted as PacketBitLen, and then, the data frame load length B is obtained and generally denoted as FrameLoadBitLen.
On the basis of the above embodiment, the padding transmission process of the data frame includes: splitting the data frame into a plurality of data blocks with fixed lengths, wherein the number of the data blocks is determined by the length of the data frame;
and sending the plurality of data blocks to the receiving end so that the receiving end can splice the data blocks after receiving the data blocks to obtain the data frame.
As can be seen from the above description of the embodiments, in the embodiments of the present invention, the filled data needs to be sent to the receiving end, and when sending, the embodiments of the present invention will split the data frame into a plurality of data blocks with fixed lengths and loads of the data blocks for transmission, where different data blocks correspond to different data frame lengths. It will be appreciated that for each data frame, the number of data blocks to be split is determined by the length of the data frame, so that the length of the data frame can be determined based on the number of data blocks when received.
For example: the length of the data packet is 320 bits, the length of the fixed length data block is 100 bits, and the length of the selected data frame is 400 bits, it can be understood that the length of the given data frame is a multiple of the length of the fixed data block, and the length of the data frame is guaranteed to be the shortest.
In the data frame, the header length of the data frame is 42 bits, the length of the data packet is 320 bits, the number of padding bits is 400-42-320=38, if the last bit of the data packet is 1, the padding bit is 0, and if the last bit of the data packet is 0, the padding bit is 1.
Fig. 3 is a schematic flow chart of another data packet length identification method according to an embodiment of the present invention, as shown in fig. 3, including:
s3, receiving the filled data frame sent by the sending end;
and S4, identifying filling bits in the data frame, and determining the length of the data packet according to the numerical values of the filling bits.
It should be noted that, the execution subject in the embodiment of the present invention is a receiving end, and it can be understood that, for each receiving process of a data packet, the method provided in the embodiment of the present invention can be adopted, so that the receiving end can accurately identify the length of the data packet.
Specifically, in step S3, after the data frame is filled, the data frame is sent to the receiving end, and after the receiving end receives the data frame, in step S4, the value of the padding bit is determined by identifying the padding bit in the frame header, and then a bit different from the value of the padding bit is searched from the last bit of the data frame load.
According to the method for identifying the length of the data packet provided by the embodiment of the invention, the filling bits are filled when the data frame is sent, so that the length of the data packet can be effectively identified at a receiving end according to the numerical value of the filling bits.
On the basis of the above embodiment, the identifying the padding bits in the data frame, and determining the packet length according to the values of the padding bits includes:
reading filling bits in a frame header of the data frame, and determining the numerical values of the filling bits;
and determining the tail bits of the data packet according to the numerical values of the padding bits so as to obtain the length of the data packet.
Furthermore, a plurality of data blocks are received at a receiving end, loads of the data blocks are spliced into a complete data frame, and then filling bits in the frame header are read to determine the numerical values of the filling bits.
And finally, searching the first bit different from the padding bit at the tail bit of the data frame load so as to find the tail bit of the data packet, thereby being capable of identifying the accurate data packet length according to the tail bit.
Fig. 4 is a schematic diagram of a transmitting end structure of a packet length identification system according to an embodiment of the present invention, as shown in fig. 4, including: a filling module 401 and a sending module 402, wherein:
the padding module 401 is configured to pad a data frame based on preset padding bits, where the number of the padding bits is determined by a data packet bit length and a data frame payload length, and a value of the padding bits is determined by a value of a last bit of the data packet;
the sending module 402 is configured to send the filled data frame to a receiving end, so that the receiving end can identify the filling bits and determine the length of the data packet according to the values of the filling bits.
For details, how to identify the packet length by using the padding module 401 and the sending module 402 may refer to the embodiment shown in fig. 1, and the embodiment of the present invention is not described herein again.
Fig. 5 is a schematic diagram of a receiving end structure of a packet length recognition system according to an embodiment of the present invention, as shown in fig. 5, including: a receiving module 501 and an identifying module 502, wherein:
the receiving module 501 is configured to receive a filled data frame sent by a sending end;
the identifying module 502 is configured to identify padding bits in the data frame, and determine a packet length according to values of the padding bits.
For details, how to identify the length of the data packet by using the receiving module 501 and the identifying module 502 can refer to the embodiment shown in fig. 3, and the embodiment of the present invention is not described herein again.
Fig. 6 illustrates a schematic structural diagram of an electronic device, and as shown in fig. 6, the server may include: a processor (processor) 610, a communication Interface (Communications Interface) 620, a memory (memory) 630 and a bus 640, wherein the processor 610, the communication Interface 620 and the memory 630 complete communication with each other through the bus 640. Communication interface 640 may be used for information transfer between a server and a smart television. The processor 610 may call logic instructions in the memory 630 to perform the following method: s1, filling a data frame based on preset filling bits, wherein the number of the filling bits is determined by the bit length of a data packet and the load length of the data frame, and the numerical value of the filling bits is determined by the numerical value of the tail bit of the data packet; s2, sending the filled data frame to a receiving end so that the receiving end can identify the filling bit and determine the length of a data packet according to the numerical value of the filling bit; s3, receiving the filled data frame sent by the sending end; and S4, identifying filling bits in the data frame, and determining the length of the data packet according to the numerical values of the filling bits.
The present embodiments also provide a computer program product comprising a computer program stored on a non-transitory computer-readable storage medium, the computer program comprising program instructions which, when executed by a computer, enable the computer to perform the method provided by the above-described method embodiments, for example, including: s1, filling a data frame based on preset filling bits, wherein the number of the filling bits is determined by the bit length of a data packet and the load length of the data frame, and the numerical value of the filling bits is determined by the numerical value of the tail bit of the data packet; s2, sending the filled data frame to a receiving end so that the receiving end can identify the filling bit and determine the length of a data packet according to the numerical value of the filling bit; s3, receiving the filled data frame sent by the sending end; and S4, identifying filling bits in the data frame, and determining the length of the data packet according to the numerical values of the filling bits.
The present embodiments provide a non-transitory computer-readable storage medium storing computer instructions that cause the computer to perform the methods provided by the above method embodiments, for example, including: s1, filling a data frame based on preset filling bits, wherein the number of the filling bits is determined by the bit length of a data packet and the load length of the data frame, and the numerical value of the filling bits is determined by the numerical value of the tail bit of the data packet; s2, sending the filled data frame to a receiving end so that the receiving end can identify the filling bit and determine the length of a data packet according to the numerical value of the filling bit; s3, receiving the filled data frame sent by the sending end; and S4, identifying filling bits in the data frame, and determining the length of the data packet according to the numerical values of the filling bits.
The above-described embodiments of the apparatus are merely illustrative, and the units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one position, or may be distributed on multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the present embodiment. One of ordinary skill in the art can understand and implement it without inventive effort.
Through the above description of the embodiments, those skilled in the art will clearly understand that each embodiment can be implemented by software plus a necessary general hardware platform, and certainly can also be implemented by hardware. With this understanding in mind, the above-described technical solutions may be embodied in the form of a software product, which can be stored in a computer-readable storage medium such as ROM/RAM, magnetic disk, optical disk, etc., and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute the methods described in the embodiments or some parts of the embodiments.
Finally, the method of the present application is only a preferred embodiment and is not intended to limit the scope of the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (8)
1. A method for identifying packet length, comprising:
s1, filling a data frame based on preset filling bits, wherein the number of the filling bits is determined by the bit length of a data packet and the load length of the data frame, and the numerical value of the filling bits is determined by the numerical value of the tail bit of the data packet;
s2, sending the filled data frame to a receiving end so that the receiving end can identify the filling bit and determine the length of a data packet according to the numerical value of the filling bit; the S1 comprises:
acquiring the value of the tail bit of the data packet to determine the value of the padding bit;
marking the filling bits in a frame header of the data frame;
acquiring the bit length of a data packet and the load length of a data frame, and determining the number of the filling bits;
filling the filling bits at the tail part of the data packet according to the number; when filling data frames, determining the shortest one of a group of given data frame lengths, wherein the load length of the data frame is more than or equal to the data packet length.
2. The method of claim 1, wherein the obtaining the value of the last bit of the packet to determine the value of the padding bit comprises:
if the value of the tail bit of the data packet is 1, the value of the padding bit is 0;
and if the value of the tail bit of the data packet is 0, the value of the padding bit is 1.
3. The method of claim 2, wherein the obtaining the packet bit length and the data frame payload length and determining the number of the padding bits comprises:
acquiring a data packet bit length A and a data frame load length B for bearing a data packet;
and calculating the difference value of the B and the A as the number of the padding bits.
4. The method of claim 3, wherein the padding transmission of the data frame comprises:
splitting the data frame into a plurality of data blocks with fixed lengths, wherein the number of the data blocks is determined by the length of the data frame;
and sending the plurality of data blocks to the receiving end so that the receiving end can splice the data blocks after receiving the data blocks to obtain the data frame.
5. A method for identifying packet length, comprising:
s3, receiving a filled data frame sent by a sending end, wherein the filling mode of the data frame comprises the following steps:
acquiring the value of the tail bit of the data packet to determine the value of the padding bit;
marking the filling bits in a frame header of the data frame;
acquiring the bit length of a data packet and the load length of a data frame, and determining the number of the filling bits;
filling the filling bits at the tail part of the data packet according to the number; when filling data frames, determining the length of the shortest data frame in a group of set data frame lengths, wherein the load length of the data frame is more than or equal to the length of a data packet;
and S4, identifying filling bits in the data frame, and determining the length of the data packet according to the numerical values of the filling bits.
6. The method according to claim 5, wherein the step S4 comprises:
reading filling bits in a frame header of the data frame, and determining numerical values of the filling bits;
determining the value of the tail bit of the data packet by the padding bit;
and searching a first target bit taking the value as the value of the tail bit of the data packet from the tail bit of the data frame load, taking the position of the target bit as the position of the tail bit of the data packet, and extracting the initial bit of the data frame load to the target bit as the data packet.
7. A transmitting end of a packet length recognition system, comprising:
the device comprises a filling module, a data frame processing module and a data frame processing module, wherein the filling module is used for filling a data frame based on preset filling bits, the number of the filling bits is determined by the bit length of a data packet and the load length of the data frame, and the numerical value of the filling bits is determined by the numerical value of the tail bit of the data packet;
a sending module, configured to send the filled data frame to a receiving end, so that the receiving end can identify the padding bits, and determine a packet length according to a value of the padding bits, where the filling module is configured to:
acquiring the value of the tail bit of the data packet to determine the value of the padding bit;
marking the filling bits in a frame header of the data frame;
acquiring the bit length of a data packet and the load length of a data frame, and determining the number of the filling bits;
filling the filling bits at the tail part of the data packet according to the number; when filling data frames, determining the shortest one of a group of given data frame lengths, wherein the load length of the data frame is more than or equal to the data packet length.
8. A receiving end of a packet length recognition system, comprising:
a receiving module, configured to receive a filled data frame sent by a sending end, where a filling manner of the data frame includes:
acquiring the value of the tail bit of the data packet to determine the value of the padding bit;
marking the filling bits in a frame header of the data frame;
acquiring the bit length of a data packet and the load length of a data frame, and determining the number of the filling bits;
filling the filling bits at the tail part of the data packet according to the number; when filling data frames, determining the shortest one of a group of set data frame lengths, wherein the load length of the data frame is more than or equal to the length of a data packet;
and the identification module is used for identifying the filling bits in the data frame and determining the length of the data packet according to the numerical values of the filling bits.
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| CN113726478B (en) * | 2021-08-06 | 2023-07-21 | 深圳市风云实业有限公司 | Multi-channel data bit width configurable 0-bit filling method and device |
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| JP3509095B2 (en) * | 2001-03-30 | 2004-03-22 | 日本電気株式会社 | Variable length frame synchronizer and variable length frame multiplex transmission device |
| CN1275438C (en) * | 2001-12-31 | 2006-09-13 | 中兴通讯股份有限公司 | Method of realizing group data reliable transmission in mobile communication system |
| CN101051880B (en) * | 2006-04-07 | 2010-11-03 | 华为技术有限公司 | Transmitting, receiving and repeating method and its device for data frame |
| CN104115438B (en) * | 2012-01-11 | 2017-05-24 | 马维尔国际贸易有限公司 | Information bit padding schemes for WLAN |
| CN102790659B (en) * | 2012-07-18 | 2017-04-19 | 福建先创通信有限公司 | Method for transmitting data packet in mobile communication system |
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| CN105991214B (en) * | 2015-01-30 | 2019-08-09 | 阿里巴巴集团控股有限公司 | A kind of data transmission method and its device |
| US10193654B2 (en) * | 2015-11-30 | 2019-01-29 | Electronics And Telecommunications Research Institute | Frame transmission method and wireless communication apparatus performing the same |
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