CN112911642B - CPRI data compression method for wireless communication base station - Google Patents
CPRI data compression method for wireless communication base station Download PDFInfo
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- CN112911642B CN112911642B CN202011526361.1A CN202011526361A CN112911642B CN 112911642 B CN112911642 B CN 112911642B CN 202011526361 A CN202011526361 A CN 202011526361A CN 112911642 B CN112911642 B CN 112911642B
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- 238000000034 method Methods 0.000 title claims abstract description 11
- 238000004891 communication Methods 0.000 title claims abstract description 10
- 238000013144 data compression Methods 0.000 title claims abstract description 8
- 238000007906 compression Methods 0.000 claims abstract description 12
- 230000006835 compression Effects 0.000 claims abstract description 12
- 230000000295 complement effect Effects 0.000 claims abstract description 4
- 238000004806 packaging method and process Methods 0.000 claims description 2
- 230000005540 biological transmission Effects 0.000 description 6
- 238000010586 diagram Methods 0.000 description 5
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 230000000873 masking effect Effects 0.000 description 1
- 239000013307 optical fiber Substances 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Classifications
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W28/00—Network traffic management; Network resource management
- H04W28/02—Traffic management, e.g. flow control or congestion control
- H04W28/06—Optimizing the usage of the radio link, e.g. header compression, information sizing, discarding information
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L63/00—Network architectures or network communication protocols for network security
- H04L63/04—Network architectures or network communication protocols for network security for providing a confidential data exchange among entities communicating through data packet networks
- H04L63/0428—Network architectures or network communication protocols for network security for providing a confidential data exchange among entities communicating through data packet networks wherein the data content is protected, e.g. by encrypting or encapsulating the payload
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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
Abstract
The invention discloses a CPRI data compression method of a wireless communication base station, N complex data are acquired at an input interface of a compression module, each complex data is composed of an I path data and a Q path data, the I path data is considered to be in front of the Q path data without losing generality, the I path data and the Q path data are separately seen to be real numbers, the I path data and the Q path data are realized in a form of two's complement codes in engineering, and the bit number of the input data is recorded as B_in. By regularizing the data, special control information is not required to be transmitted, and the processing and storage cost of the interface is effectively reduced; the transmitted data is protected to some extent by encoding and encrypting the control information.
Description
Technical Field
The invention belongs to the field of wireless communication, and in particular relates to a CPRI data compression method of a wireless communication base station.
Background
At present, a CPRI interface in an FH link in a wireless communication technology has a main function of being used as an interface for directly carrying out baseband data interaction between an eNB and an RRU, the format of the CPRI interface is generally IQ data alternately arranged, and different equipment manufacturers have private agreements. A common base station transmission scheme is shown in FIG. 1, in which BBU represents a base station processing unit and is responsible for processing physical layer signals, and is the main constituent equipment of a receiver and a transmitter; CPRI interface in the figure is an interface, generally in the form of optical fiber, responsible for directly transmitting baseband waveform signals between BBU and RRU; the RRU in the figure is a remote radio unit and is responsible for the receiving and transmitting processing of a radio frequency channel; the antenna part is responsible for the conversion of electric signals and wireless electromagnetic waves; at present, the common bits of the CPRI compression method are the modes that additional control block data is arranged in front of and behind normal compression data, and the compression mode has two disadvantages, namely, the data is not regular enough, additional processing logic is required to be added, and the redundant information bits are added to consume more bandwidth and waste resources.
In view of the above problems, how to provide a new data compression and transmission manner, so that the data compression and transmission manner is more regular and the transmission bandwidth is more effectively utilized, and no effective solution has been found yet.
Disclosure of Invention
The technical scheme adopted by the invention for solving the technical problems is to provide a CPRI data compression method of a wireless communication base station, wherein CPRI compressed data is mixed into target transmitting data after special coding treatment, so that the transmission bandwidth can be more effectively utilized, and a certain encryption function is provided.
In order to solve the technical problems, the adopted specific technical scheme is as follows:
compressing the data transmitted by CPRI with low complexity;
1) N complex data are acquired at an input interface of the compression module, each complex data is composed of one I path of data and one Q path of data, without losing generality, the I path of data is considered to be in front of the Q path of data, the I path of data and the Q path of data are independently seen to be real numbers, the complex data are realized in a form of two's complement codes in engineering, and the bit number of the input data is recorded as B_in;
2) Traversing 2N real number data corresponding to the N complex number data, taking an absolute value for each data, traversing to obtain the number with the largest absolute value in the 2N data, and marking the number as R_max;
3) Carrying out operation of solving leading 0 on the value R_max with the maximum absolute value to obtain the number S of leading 0, wherein S is an integer greater than or equal to 0;
4) Traversing 2N real data corresponding to the N input complex data, performing left shift S-bit operation on each data, and starting from the MSB of each data, intercepting B_out bits to obtain data of an output interface.
Encoding control information generated by compression;
and (3) packaging and integrating the compressed data, and combining the control information S and the data bits generated in the previous steps, wherein the steps are as follows:
1) Repeatedly encoding control information data of B_info bits to obtain B_scramble bits;
2) Scrambling the B_scramble bits, wherein the content of a scrambling sequence is pre-defined at the receiving and transmitting ends;
3) B_sync synchronization bits are added in front of the scrambled bit sequence, wherein the content and the length of the synchronization bits are also defined at the receiving and transmitting ends;
4) And replacing the original data by the obtained control information bit sequence according to the LSB bit positions of the data which are put into the data bit by bit in the row.
The above method for compressing CPRI data in a wireless communication base station, wherein: the control information is interleaved into the LSBs of the data.
Compared with the prior art, the invention has the following beneficial effects:
according to the scheme, CPRI compressed data is mixed into target emission data after special coding treatment, so that the data is normalized, special control information is not required to be transmitted, and the processing and storage cost of an interface is effectively reduced; the transmitted data is protected to some extent by encoding and encrypting the control information.
Drawings
Fig. 1 is a schematic diagram of a conventional base station transmission scheme.
Fig. 2 is a schematic diagram of the data arrangement after compression.
Fig. 3 is a schematic diagram of replacing original data with the obtained LSB bit positions of the control information bit sequence according to the line and bit by bit.
Description of the embodiments
The invention is further described below with reference to the drawings and examples.
OFDM:Orthogonal Frequency Division Multiplexing。
LTE:Long Term Evolution。
NR:New Radio。
CPRI:Common Public Radio Interface。
LSB:Least Significant Bit。
MSB:Most Significant Bit。
BBU:Base Band Unit。
RRU:Radio Remote Unit。
First, the compression mode of the CPRI interface data related to the present invention is described as follows:
1) N complex data are acquired at an input interface of a compression module, wherein each complex data is composed of one I path of data and one Q path of data, without losing generality, the I path of data is considered to be in front of the Q path of data, the I path of data and the Q path of data are separately seen to be real numbers, the complex data are realized in a form of two's complement codes in engineering, and the bit number of the input data is recorded as B_in;
2) Traversing 2N real number data corresponding to the N complex number data, taking an absolute value for each data, traversing to obtain the number with the largest absolute value in the 2N data, and marking the number as R_max;
3) Carrying out operation of solving leading 0 on the value R_max with the maximum absolute value to obtain the number S of leading 0, wherein S is an integer greater than or equal to 0;
4) Traversing 2N real data corresponding to the N input complex data, performing left shift S-bit operation on each data, and starting from the MSB of each data, intercepting B_out bits to obtain data of an output interface;
fig. 2 is a schematic diagram of the arrangement of compressed data. Wherein each square represents a bit in which the data is arranged in an iqiq.
Secondly, the compressed data is packed and integrated, and the control information S and the data bits generated in the previous step are combined together. The method comprises the following steps:
repeatedly encoding control information data of B_info bits to obtain B_scramble bits;
scrambling b_coded bits, wherein the content of the scrambling sequence is predefined in advance at both transceiver ends, which is considered to be known, and the 01010101 sequence can be used as an example here;
b_sync synchronization bits are added in front of the scrambled bit sequence, wherein the content and the length of the synchronization bits are agreed by the receiving and transmitting ends;
the obtained control information bit sequence is put into the LSB bit position of the data bit by bit according to the row to replace the original data;
fig. 3 is a schematic diagram.
B_info represents a constant representing the number of information bits, e.g. 111000111, b_info should be 9; and b_stream represents the number of bits after repetition coding, for example, if the above coding is 111000111111000111, then b_stream is 18.
In summary, the key points of the scheme of the application are as follows:
1) Compressing the data transmitted by CPRI with low complexity;
2) Encoding control information generated by compression;
3) The encoding includes (1) repeating the process of encoding the control information bit sequence to fit the specified length, i.e., to have a rate matching; (2) Performing a fixed masking operation on the matched sequences to protect the data; (3) A leader sequence with fixed length is added, so that the target data can be more conveniently positioned and judged at a receiving end;
4) The control information is interleaved into the LSBs of the data with no overhead.
Claims (2)
1. A method for compressing CPRI data of a wireless communication base station, which is characterized in that:
compressing the data transmitted by CPRI with low complexity;
n complex data are acquired at an input interface of the compression module, each complex data is composed of one I path of data and one Q path of data, without losing generality, the I path of data is considered to be in front of the Q path of data, the I path of data and the Q path of data are independently seen to be real numbers, the complex data are realized in a form of two's complement codes in engineering, and the bit number of the input data is recorded as B_in;
traversing 2N real number data corresponding to the N complex number data, taking an absolute value for each data, traversing to obtain the number with the largest absolute value in the 2N data, and marking the number as R_max;
carrying out operation of solving leading 0 on the value R_max with the maximum absolute value to obtain the number S of leading 0, wherein S is an integer greater than or equal to 0;
traversing 2N real data corresponding to the N input complex data, performing left shift S-bit operation on each data, and starting from the MSB of each data, intercepting B_out bits to obtain data of an output interface;
encoding control information generated by compression;
and (3) packaging and integrating the compressed data, and combining the control information S and the data bits generated in the previous steps, wherein the steps are as follows:
repeatedly encoding control information data of B_info bits to obtain B_scramble bits;
scrambling the B_scramble bits, wherein the content of a scrambling sequence is pre-defined at the receiving and transmitting ends;
b_sync synchronization bits are added in front of the scrambled bit sequence, wherein the content and the length of the synchronization bits are also defined at the receiving and transmitting ends;
and replacing the original data by the obtained control information bit sequence according to the LSB bit positions of the data which are put into the data bit by bit in the row.
2. The method for CPRI data compression in a wireless communication base station as claimed in claim 1, wherein: the control information is interleaved into the LSBs of the data.
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| CN202011526361.1A CN112911642B (en) | 2020-12-22 | 2020-12-22 | CPRI data compression method for wireless communication base station |
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| CN112911642B true CN112911642B (en) | 2024-01-19 |
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| US9520971B2 (en) * | 2012-07-17 | 2016-12-13 | Zte Corporation | Data transmission method and device |
| US10498793B2 (en) * | 2017-07-31 | 2019-12-03 | Microsoft Technology Licensing, Llc | System and method for digital compression for streaming data |
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