CN114827287B - Data compression method and system - Google Patents
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- CN114827287B CN114827287B CN202111151155.1A CN202111151155A CN114827287B CN 114827287 B CN114827287 B CN 114827287B CN 202111151155 A CN202111151155 A CN 202111151155A CN 114827287 B CN114827287 B CN 114827287B
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- 238000013144 data compression Methods 0.000 title claims abstract description 46
- 238000000034 method Methods 0.000 title claims abstract description 19
- 230000005540 biological transmission Effects 0.000 claims abstract description 50
- 238000007906 compression Methods 0.000 claims description 113
- 230000006835 compression Effects 0.000 claims description 113
- 238000004422 calculation algorithm Methods 0.000 claims description 11
- 238000012545 processing Methods 0.000 claims description 11
- 238000004590 computer program Methods 0.000 description 7
- 238000010586 diagram Methods 0.000 description 7
- 230000006870 function Effects 0.000 description 4
- 238000012986 modification Methods 0.000 description 4
- 230000004048 modification Effects 0.000 description 4
- 238000004891 communication Methods 0.000 description 3
- 230000004075 alteration Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000004128 high performance liquid chromatography Methods 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 238000010276 construction Methods 0.000 description 1
- 230000009977 dual effect Effects 0.000 description 1
- 239000002360 explosive Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 239000013307 optical fiber Substances 0.000 description 1
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Classifications
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L69/00—Network arrangements, protocols or services independent of the application payload and not provided for in the other groups of this subclass
- H04L69/04—Protocols for data compression, e.g. ROHC
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03M—CODING; DECODING; CODE CONVERSION IN GENERAL
- H03M7/00—Conversion of a code where information is represented by a given sequence or number of digits to a code where the same, similar or subset of information is represented by a different sequence or number of digits
- H03M7/30—Compression; Expansion; Suppression of unnecessary data, e.g. redundancy reduction
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- Computer Networks & Wireless Communication (AREA)
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- Compression, Expansion, Code Conversion, And Decoders (AREA)
Abstract
The invention discloses a data compression method and system, and belongs to the technical field of data compression. The method of the invention comprises the following steps: acquiring short descriptor description of Data to be compressed, determining a forward active energy Data block of the Data to be compressed according to the short descriptor of the Data to be compressed, determining Data0 to be transmitted and Data1 to be transmitted last time in the forward active energy Data block of the Data to be compressed, and generating Data2 by differencing the Data1 and the Data 0; generating compressed header information of Data0 to be transmitted according to Data2; generating CRC check Data according to Data 0; compressed Data of Data0 to be transmitted is generated using Data2, the compressed header information, and the CRC check Data. The invention improves the transmission efficiency and the bandwidth utilization rate of the data and stores the data efficiently.
Description
Technical Field
The present invention relates to the field of data compression technology, and more particularly, to a data compression method and system.
Background
The technology and business of the energy internet are rapidly developed, the strategy of 'new capital construction' of the power grid company is steadily advanced, and the variety and the number of measuring devices at the client side are in explosive growth. More and more devices are connected into customer side energy sources, including electric automobile charging facilities, distributed energy sources, residential families, commercial buildings, enterprises, parks, regional multi-energy and other measuring devices, and higher requirements are put on coverage range, bandwidth rate, communication time delay, system stability and the like of communication access.
Disclosure of Invention
The invention provides a data compression method for improving the transmission efficiency and the bandwidth utilization rate of data and efficiently storing the data, which comprises the following steps:
Acquiring a short descriptor of Data to be compressed, determining a forward active energy Data block of the Data to be compressed according to the short descriptor of the Data to be compressed, determining Data0 to be transmitted and Data1 to be transmitted last time in the forward active energy Data block of the Data to be compressed, and generating Data2 by differencing the Data1 and the Data 0;
generating compressed header information of Data0 to be transmitted according to Data 2;
generating CRC check Data according to Data 0;
Compressed Data of Data0 to be transmitted is generated using Data2, the compressed header information, and the CRC check Data.
After the compressed data is generated, a transmission protocol used for external transmission comprises the following steps: transmitting in a mode of requesting compression transmission or responding compression transmission;
If the transmission mode is to request compression transmission, the generated compressed data carries the compression algorithm, the compression mode information and the processing result of the compressed data and then is transmitted.
Optionally, the compression mode of the compressed data is lossless difference data compression;
If the compression mode of the compressed Data cannot use lossless difference Data compression, the compression mode of the compressed Data uses lossless Data compression, and the lossless Data compression compresses CRC check Data and Data0 to generate compressed Data.
Optionally, compressing the header information includes: compressing the header byte length and the field compression bit;
the field compression bit is used for representing a data block compression mode by two digits, 0 represents lossless data compression, 1 represents lossless difference data compression, and 2 represents no compression.
Optionally, the short descriptor includes: object identification, object characteristics, object attribute identification and element index in attribute.
Optionally, the method further comprises: after using the CRC check Data generated by the Data0 Data, CRC16 check Data is generated as additional check Data from the CRC check Data.
The invention also provides a data compression system, which comprises:
generating a Data difference unit, acquiring a short descriptor of Data to be compressed, determining a forward active energy Data block of the Data to be compressed according to the short descriptor of the Data to be compressed, determining Data0 to be transmitted and Data1 to be transmitted last time in the forward active energy Data block of the Data to be compressed, and generating Data2 by differencing the Data1 and the Data 0;
A compressed header information generating unit for generating compressed header information of Data0 to be transmitted according to Data 2;
A check Data generation unit for generating CRC check Data according to Data 0;
The compressed Data generation unit generates compressed Data of Data0 to be transferred using Data2, compression header information, and CRC check Data.
Optionally, after the compressed data is generated, a transmission protocol used for external transmission includes: transmitting in a mode of requesting compression transmission or responding compression transmission;
If the transmission mode is to request compression transmission, the generated compressed data carries the compression algorithm, the compression mode information and the processing result of the compressed data and then is transmitted.
Optionally, the compression mode of the compressed data is lossless difference data compression;
If the compression mode of the compressed Data cannot use lossless difference Data compression, the compression mode of the compressed Data uses lossless Data compression, and the lossless Data compression compresses CRC check Data and Data0 to generate compressed Data.
Optionally, compressing the header information includes: compressing the header byte length and the field compression bit;
the field compression bit is used for representing a data block compression mode by two digits, 0 represents lossless data compression, 1 represents lossless difference data compression, and 2 represents no compression.
Optionally, the short descriptor includes: object identification, object characteristics, object attribute identification and element index in attribute.
Optionally, the check data generating unit is further configured to: after the CRC check Data generated using the Data0 Data, CRC16 check Data is generated as additional check Data from the CRC check Data.
The invention compresses the Data2, the compressed header information and the CRC check Data to generate the compressed Data, transmits the compressed Data, improves the transmission efficiency and the bandwidth utilization rate of the Data, and stores the Data efficiently.
Drawings
FIG. 1 is a flow chart of the method of the present invention;
Fig. 2 is a block diagram of the system of the present invention.
Detailed Description
The exemplary embodiments of the present invention will now be described with reference to the accompanying drawings, however, the present invention may be embodied in many different forms and is not limited to the examples described herein, which are provided to fully and completely disclose the present invention and fully convey the scope of the invention to those skilled in the art. The terminology used in the exemplary embodiments illustrated in the accompanying drawings is not intended to be limiting of the invention. In the drawings, like elements/components are referred to by like reference numerals.
Unless otherwise indicated, terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art. In addition, it will be understood that terms defined in commonly used dictionaries should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense.
The invention provides a data compression method, as shown in fig. 1, comprising the following steps:
Acquiring a short descriptor of Data to be compressed, determining a forward active energy Data block of the Data to be compressed according to the short descriptor of the Data to be compressed, determining Data0 to be transmitted and Data1 to be transmitted last time in the forward active energy Data block of the Data to be compressed, and generating Data2 by differencing the Data1 and the Data 0;
The data to be compressed comprises various electric data such as electric energy, voltage, current, power and the like;
generating compressed header information of Data0 to be transmitted according to Data 2;
generating CRC check Data according to Data 0;
Compressed Data of Data0 to be transmitted is generated using Data2, the compressed header information, and the CRC check Data.
After the compressed Data is generated, CRC16 check Data generated by Data0 Data is used as additional check Data, and the additional check Data is used for a receiver of the compressed Data to check the correctness of the received compressed Data.
After the compressed data is generated, a transmission protocol used for external transmission comprises the following steps: transmitting in a mode of requesting compression transmission or responding compression transmission;
If the transmission mode is to request compression transmission, the generated compressed data carries the compression algorithm, the compression mode information and the processing result of the compressed data and then is transmitted.
Wherein compressing header information includes: compressing the header byte length and the field compression bit;
the field compression bit is used for representing a data block compression mode by two digits, 0 represents lossless data compression, 1 represents lossless difference data compression, and 2 represents no compression.
Wherein the short descriptor comprises: object identification, object characteristics, object attribute identification and element index in attribute.
The transmission protocol used for transmitting the compressed data in the invention supports compression coding;
the transmission protocol is based on a client-side energy measurement data exchange protocol, supports two compression transmission modes, namely request compression transmission and response compression transmission, and supports parameter fields carrying compression algorithm, compression mode information, compression processing results and the like besides supporting transmission of compression data when the request compression transmission is carried out.
Supporting a local channel, comprising: RS-485, M-Bus, CAN, RF, PLC, HPLC, micropower wireless and HPLC with micropower wireless dual mode communication, remote channel support includes: GPRS, 3G, 4G, 5G, private power network 230M, ethernet, optical fiber, etc.
Because the parameters of the carried compression algorithm are supported, the lossless data transmission compression algorithm of the energy source measurement data exchange protocol at the client side is supported by a plurality of general compression algorithms such as LZW, LZ77/78, RLE, GZIP and the like.
Whether each data needs to be compressed or not, the compression mode is to use lossless difference data compression or lossless full compression, and the compression mode is represented by using data compression header information according to the range of data difference values and transmission requirements, such as a difference value of 0, namely no difference, lossless full compression, small difference, lossless difference data compression, large difference and no compression, and original data transmission.
The compression header information includes: the header byte length is compressed and the field compresses the bit.
The field compression bit is used to represent the data block compression mode with two bits, 0 represents full compression, 1 represents differential compression, and 2 represents no compression.
The invention is further illustrated by the following examples:
for a forward active energy Data block, the Data0 to be transmitted this time is:
The last transmitted Data1 is:
the difference between the metering Data0 transmitted at this time and the metering Data1 at last time corresponding to different rate value fields is generated Data2, which is:
wherein, specific difference Data of Data2 and compression head are as follows:
bit7, 0, no compression head, 1: a compression head is arranged;
Bit5: compression ratio is 0:1/2 compression, and 1:1/4 compression;
Bit0 to Bit4: n data, the compression mode adopted specifically;
in the difference data, each byte represents 4 groups of compression coding modes
The compression header information is expressed as: 0x85,0x52,0x01.
Wherein, 0x85 represents a length domain, 1/2 compression, and the length is 5 Mbit length; there is an example of the electric energy data, and when the electric energy data is 4 bytes, the width of the single group data after the current compression is 2 bytes
Bits 0 to 1 of 0x52 are 0x02, indicating no compression;
Bits 2 to 3 of 0x52 are 0x00, representing full compression;
bits 4 to 5 of 0x52 are 0x01, representing differential compression;
Bit6 to bit7 of 0x52 are 0x01, representing differential compression;
Bits 0 to 1 of 0x01 are 0x01, representing differential compression.
And then, checking the Data0 Data by using a CRC-CCITT checking algorithm, and completing a complete Data compression process.
The present invention also proposes a data compression system 200, as shown in fig. 2, comprising:
Generating a Data difference unit 201, acquiring a short descriptor of Data to be compressed, determining a forward active energy Data block of the Data to be compressed according to the short descriptor of the Data to be compressed, determining Data0 to be transmitted and Data1 to be transmitted last time in the forward active energy Data block of the Data to be compressed, and generating Data2 by differencing the Data1 and the Data 0;
A compressed header information generating unit 202 that generates compressed header information of Data0 to be transmitted from Data 2;
a check Data generation unit 203 that generates CRC check Data from Data 0; and using CRC16 check Data generated by the Data0 Data as additional check Data, wherein the additional check Data is used for a receiver of the compressed Data to check the correctness of the received compressed Data.
A compressed Data generation unit 204 that generates compressed Data of Data 0to be transmitted using Data2, compression header information, and CRC check Data;
After the compressed data is generated, a transmission protocol used for external transmission comprises the following steps: transmitting in a mode of requesting compression transmission or responding compression transmission;
If the transmission mode is to request compression transmission, the generated compressed data carries the compression algorithm, the compression mode information and the processing result of the compressed data and then is transmitted.
The compression mode of the compressed data is lossless difference data compression;
If the compression mode of the compressed Data cannot use lossless difference Data compression, the compression mode of the compressed Data uses lossless Data compression, and the lossless Data compression compresses CRC check Data and Data0 to generate compressed Data.
Wherein compressing header information includes: compressing the header byte length and the field compression bit;
the field compression bit is used for representing a data block compression mode by two digits, 0 represents lossless data compression, 1 represents lossless difference data compression, and 2 represents no compression.
Wherein the short descriptor comprises: object identification, object characteristics, object attribute identification and element index in attribute.
Wherein the check data generating unit is further configured to: after the CRC check Data generated using the Data0 Data, CRC16 check Data is generated as additional check Data from the CRC check Data.
The invention improves the transmission efficiency and the bandwidth utilization rate of the data and stores the data efficiently.
It will be appreciated by those skilled in the art that embodiments of the present invention may be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein. The scheme in the embodiment of the invention can be realized by adopting various computer languages, such as object-oriented programming language Java, an transliteration script language JavaScript and the like.
The present invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems) and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flowchart illustrations and/or block diagrams, and combinations of flows and/or blocks in the flowchart illustrations and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. It is therefore intended that the following claims be interpreted as including the preferred embodiments and all such alterations and modifications as fall within the scope of the invention.
It will be apparent to those skilled in the art that various modifications and variations can be made to the present invention without departing from the spirit or scope of the invention. Thus, it is intended that the present invention also include such modifications and alterations insofar as they come within the scope of the appended claims or the equivalents thereof.
Claims (8)
1. A method of compressing data, the method comprising:
Acquiring a short descriptor of Data to be compressed, determining a forward active energy Data block of the Data to be compressed according to the short descriptor of the Data to be compressed, determining Data0 to be transmitted and Data1 to be transmitted last time in the forward active energy Data block of the Data to be compressed, and generating Data2 by differencing the Data1 and the Data 0;
the short descriptor includes: object identification, object characteristics, object attribute identification and element index in attribute;
generating compressed header information of Data0 to be transmitted according to Data 2;
the compression header information includes: compressing the header byte length and the field compression bit;
the field compression bit is used for representing a data block compression mode by two digits, 0 represents lossless data compression, 1 represents lossless difference data compression, and 2 represents non-compression;
generating CRC check Data according to Data 0;
Compressed Data of Data0 to be transmitted is generated using Data2, the compressed header information, and the CRC check Data.
2. The method of claim 1, wherein after the compressed data is generated, a transmission protocol used for external transmission includes: transmitting in a mode of requesting compression transmission or responding compression transmission;
If the transmission mode is to request compression transmission, the generated compressed data carries the compression algorithm, the compression mode information and the processing result of the compressed data and then is transmitted.
3. The method of claim 1, wherein the compression mode of the compressed data is lossless difference data compression;
If the compression mode of the compressed Data cannot use lossless difference Data compression, the compression mode of the compressed Data uses lossless Data compression, and the lossless Data compression compresses CRC check Data and Data0 to generate compressed Data.
4. The method of claim 1, the method further comprising: after generating CRC check Data using Data0 Data, CRC16 check Data is generated as additional check Data from the CRC check Data.
5. A system for compressing data, the system comprising:
generating a Data difference unit, acquiring a short descriptor of Data to be compressed, determining a forward active energy Data block of the Data to be compressed according to the short descriptor of the Data to be compressed, determining Data0 to be transmitted and Data1 to be transmitted last time in the forward active energy Data block of the Data to be compressed, and generating Data2 by differencing the Data1 and the Data 0;
the short descriptor includes: object identification, object characteristics, object attribute identification and element index in attribute;
A compressed header information generating unit for generating compressed header information of Data0 to be transmitted according to Data 2;
the compression header information includes: compressing the header byte length and the field compression bit;
the field compression bit is used for representing a data block compression mode by two digits, 0 represents lossless data compression, 1 represents lossless difference data compression, and 2 represents non-compression;
A check Data generation unit for generating CRC check Data according to Data 0;
The compressed Data generation unit generates compressed Data of Data0 to be transferred using Data2, compression header information, and CRC check Data.
6. The system of claim 5, wherein the transmission protocol used for external transmission after the compressed data is generated comprises: transmitting in a mode of requesting compression transmission or responding compression transmission;
If the transmission mode is to request compression transmission, the generated compressed data carries the compression algorithm, the compression mode information and the processing result of the compressed data and then is transmitted.
7. The system of claim 5, wherein the compression mode of the compressed data is lossless difference data compression;
If the compression mode of the compressed Data cannot use lossless difference Data compression, the compression mode of the compressed Data uses lossless Data compression, and the lossless Data compression compresses CRC check Data and Data0 to generate compressed Data.
8. The system of claim 5, the check data generation unit further to: after generating CRC check Data using Data0 Data, CRC16 check Data is generated as additional check Data from the CRC check Data.
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| WO2014145363A2 (en) * | 2013-03-15 | 2014-09-18 | Hughes Network Systems, Llc | Data compression for priority-based data traffic, on an aggregate traffic level, in a multi-stream communications system |
| CN110277998A (en) * | 2019-06-27 | 2019-09-24 | 中国电力科学研究院有限公司 | Electric network data lossless compression method and device |
| CN112202623A (en) * | 2020-12-03 | 2021-01-08 | 北京和利时系统工程有限公司 | Data processing method and device |
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| WO2014145363A2 (en) * | 2013-03-15 | 2014-09-18 | Hughes Network Systems, Llc | Data compression for priority-based data traffic, on an aggregate traffic level, in a multi-stream communications system |
| CN110277998A (en) * | 2019-06-27 | 2019-09-24 | 中国电力科学研究院有限公司 | Electric network data lossless compression method and device |
| CN112202623A (en) * | 2020-12-03 | 2021-01-08 | 北京和利时系统工程有限公司 | Data processing method and device |
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| 基于动态字典和差分编码的计量数据压缩研究;梁捷;信息技术;20201022(10);全文 * |
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