CN102801681B - Data transmission method and distributed base station - Google Patents
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- 238000007906 compression Methods 0.000 claims description 17
- 230000006835 compression Effects 0.000 claims description 17
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- 239000013307 optical fiber Substances 0.000 description 5
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Abstract
This application provides a kind of data transmission method and distributed base station, the problem that volume of transmitted data is big and transmission cost is high is can solve the problem that.The data transfer that methods described is used between the Base Band Unit of distributed base station and remote radio unit (RRU), including the data transmitted between the Base Band Unit and remote radio unit (RRU) are frequency domain data, and time-domain and frequency-domain conversion is carried out to data in the remote radio unit (RRU).The application is transmitted using frequency domain data, for time domain data is converted into, in the case where not being compressed to data, it is possible to reduce the transmitted data amount of Base Band Unit and remote radio unit (RRU), such that it is able to reduce transmission cost, the demand to bandwidth is reduced.
Description
Technical field
The application is related to wireless data processing technical field, more particularly to a kind of data transmission method and distributed base
Stand.
Background technology
Base station equipment (NodeB) in TD-SCDMA baseband extension systems is distributed base station equipment, including Base Band Unit
(BBU, Base Band Unit) and remote radio unit (RRU) (RRU, Remote Radio Unit), generally makes between BBU and RRU
Connected with optical fiber.One BBU can be connected with a RRU by a pair of optical fiber, many in order to meet System Expansion and network structure
The requirement of sample, Ir interfaces (interface between BBU and RRU) agreement is extended to connection between BBU and RRU, including many
The different connection sides such as star-like connection, chain connection and ring-like connection that individual RRU is served between same BBU and the BBU
Formula.
Ir interface protocols support the transmission of all valid data between BBU and RRU, but transmission is needed between BBU and RRU
Data volume it is very huge, with the 20MHz bandwidth systems of Long Term Evolution (Long Time Evolution, LTE) as a example by, LTE's
In 20MHz bandwidth systems, baseband signal samples rate is 30.72Mhz, and quantization resolution is 16bit, then, it is up that (RRU is transmitted
To BBU) gross bit rate of I/Q signal is that air interface rate under 2 antenna cases is：30.72M × 32bit × 2 antenna
× (10/8)=2.4576Gbps.If received using 8 antennas, required base band transmission speed is the sky under 8 antenna cases
Middle interface rate is：The data needs of eating dishes without rice or wine of 30.72M × 32bit × 8 antenna × (10/8)=9.8304Gbps, i.e. 20M8A
10G optical interfaces are transmitted.The sampling rate of descending (BBU is transferred to RRU) is identical with up, it is also desirable to same transmission rate ability
Data needed for transmission Base-Band Processing.Therefore, the mass data of transmission is needed between RRU and BBU so that must between RRU and BBU
Transmission line must be increased or bandwidth is expanded, so as to the implementation complexity and cost that result in system are greatly increased.
Additionally, another common practice is using I/Q data compress technique, i.e., meet transmission by reducing the method for data
Demand.But compression method common at present is all to use lossy compression method, while data volume is reduced, the information that data are carried
Also in loss.If compression ratio is excessive, can also have an impact to data receiving sensitivity, increased the design difficulty of equipment with into
This.
The content of the invention
The application provides a kind of data transmission method and distributed base station, can solve the problem that volume of transmitted data is big and transmits into
This problem high.
In order to solve the above problems, this application discloses a kind of data transmission method, for the base band list of distributed base station
Data transfer between unit and remote radio unit (RRU), including the data of transmission are between the Base Band Unit and remote radio unit (RRU)
Data are carried out time-domain and frequency-domain conversion by frequency domain data in the remote radio unit (RRU).
Preferably, methods described also includes：
Before frequency domain data, the frequency domain data is compressed；With
After the frequency domain data after receiving compression, the frequency domain data after the compression is decompressed.
Preferably, the frequency domain data is transferred to remote radio unit (RRU) by Base Band Unit, and the data transmission method includes：
Remote radio unit (RRU) will be transferred to by IR interfaces by the frequency domain data after Base-Band Processing in Base Band Unit；
Remote radio unit (RRU) carries out being converted to time domain data to the frequency domain data.
Preferably, the frequency domain data is transferred to Base Band Unit by remote radio unit (RRU), and the data transmission method includes：
Remote radio unit (RRU) by the time domain data after Digital IF Processing to carrying out being converted to frequency domain data；
The frequency domain data is transferred to Base Band Unit by IR interfaces.
Preferably, it is described data are carried out time-domain and frequency-domain conversion include：
Realized using Fast Fourier Transform (FFT) or discrete Fourier transform.
Present invention also provides a kind of distributed base station, including Base Band Unit and remote radio unit (RRU), the Base Band Unit
The data transmitted and remote radio unit (RRU) between are frequency domain data, and the remote radio unit (RRU) includes time-domain and frequency-domain modular converter,
For carrying out time-domain and frequency-domain conversion to data.
Preferably, the Base Band Unit and remote radio unit (RRU) include data processing module, for the frequency domain before transmission
Data are compressed and the frequency domain data after the compression that receives are decompressed.
Preferably, the time-domain and frequency-domain modular converter includes：
Fast Fourier Transform (FFT) unit or discrete Fourier transform unit.
Compared with prior art, the application includes advantages below：
The data transmission method and distributed base station of the application, by changing between Base Band Unit and remote radio unit (RRU)
Flow chart of data processing, script is carried out in Base Band Unit to be changed to enter in remote radio unit (RRU) the step of data time-domain and frequency-domain is changed
OK, that is, the position of the IR interfaces between Base Band Unit and remote radio unit (RRU) is changed.By this kind of mode, make Base Band Unit and
The data transmitted between remote radio unit (RRU) are frequency domain data, because for time domain data, every millisecond of frequency domain data is
1200 × 15 OFDM symbols, and every millisecond of time domain data is 2048 × 15 OFDM symbols, namely using frequency domain data transmission
Data volume be using time domain data transmit data volume 59% (1200/2048).Therefore, passed using frequency domain data
It is defeated, for time domain data is converted into, in the case where not being compressed to data, it is possible to reduce Base Band Unit and
The transmitted data amount of remote radio unit (RRU), such that it is able to reduce transmission cost, reduces the demand to bandwidth.
When implementing, because it is by software logic control realization, remote to carry out time-domain and frequency-domain conversion for data
Increase in the radio frequency unit of end time-domain and frequency-domain modular converter only need to be realized by modifying software logic Base Band Unit and
The change of the IR interface positions between remote radio unit (RRU), so that the flow chart of data processing in distributed base station changes.
It is therefore not necessary to carry out the upgrading of hardware, but can be that significant reduction Base Band Unit and remote radio unit (RRU) pass through Optical Fiber Transmission
Data volume, and the integrality and accuracy of data can be ensured, such that it is able to reduce data transfer cost.
Certainly, any product for implementing the application is not necessarily required to while reaching all the above advantage.
Brief description of the drawings
In order to illustrate more clearly of the embodiment of the present application or technical scheme of the prior art, below will be to institute in embodiment
The accompanying drawing for needing to use is briefly described, it should be apparent that, drawings in the following description are only some implementations of the application
Example, for those of ordinary skill in the art, on the premise of not paying creative work, can also obtain according to these accompanying drawings
Obtain other accompanying drawings.
Fig. 1 is the flow chart of the data transmission method embodiment one of the application；
Fig. 2 is the flow chart of the data transmission method embodiment two of the application；
Fig. 3 is the structural representation of the distributed base station embodiment one of the application；
Fig. 4 is the structural representation of the distributed base station embodiment two of the application；
Fig. 5 is the instance graph that carries out data transmission of distributed base station of the application.
Specific embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present application, the technical scheme in the embodiment of the present application is carried out clear, complete
Site preparation is described, it is clear that described embodiment is only some embodiments of the present application, rather than whole embodiments.It is based on
Embodiment in the application, the every other embodiment that those of ordinary skill in the art are obtained belongs to the application protection
Scope.
The data that the data transmission method of the application is used between the Base Band Unit of distributed base station and remote radio unit (RRU)
Transmission, including：The data transmitted between Base Band Unit and remote radio unit (RRU) are frequency domain data, in the remote radio unit (RRU)
Time-domain and frequency-domain conversion is carried out to data.
Specifically, the data transmission method transfers data to remote radio unit (RRU) and far end radio frequency list including Base Band Unit
Unit transfers data to two kinds of situations of Base Band Unit.
Reference picture 1, shows the data transmission method embodiment one of the application, and the present embodiment is Base Band Unit by data transfer
To remote radio unit (RRU), comprise the following steps：
Step 101, will be transferred to far end radio frequency by the frequency domain data after Base-Band Processing in Base Band Unit by IR interfaces
Unit.
Step 102, remote radio unit (RRU) carries out being converted to time domain data to the frequency domain data.
It is appreciated that the conversion of foregoing time domain data and frequency domain data can be by Fourier transformation, transform, La Pula
This conversion is obtained.In the application, it is preferred to use time domain is realized in Fast Fourier Transform (FFT) (FFT) or discrete Fourier transform (DFT)
The conversion of frequency domain data.
Reference picture 2, shows the data transmission method embodiment two of the application, and the present embodiment is remote radio unit (RRU) by data
Base Band Unit is transferred to, is comprised the following steps：
Step 201, remote radio unit (RRU) by the time domain data after Digital IF Processing to carrying out being converted to frequency domain number
According to.
It is appreciated that the conversion of foregoing time domain data and frequency domain data can be obtained by Fast Fourier Transform (FFT).
Step 202, Base Band Unit is transferred to by the frequency domain data by IR interfaces.
It is appreciated that for previous embodiment one and embodiment two, can also be to frequency domain number before carrying out data transmission
According to being compressed.I.e. Base Band Unit and remote radio unit (RRU) are transmitted again after being compressed to frequency domain data.Correspondingly, exist
When receiving the frequency domain data after compression, in addition it is also necessary to which it is decompressed.I.e. Base Band Unit and remote radio unit (RRU) can be right
Processed again after frequency domain data decompression after the compression for receiving.
It is appreciated that in addition to step described above, other data processings in Base Band Unit and remote radio unit (RRU)
Flow is identical with normal flow chart of data processing.If for example, Base Band Unit transfers data to remote radio unit (RRU), for base
Frequency domain data after tape handling, before remote radio unit (RRU) is transferred to, it is also possible to carry out data serioparallel exchange, data CPRI into
The treatment such as frame, remote radio unit (RRU) is after the frequency domain data is received, it is also possible to carry out corresponding data serioparallel exchange, data
The treatment such as CPRI solution frames, are then converted into time domain data.Equally, if remote radio unit (RRU) transfers data to Base Band Unit,
For the time domain data after Digital IF Processing, frequency domain data is converted to first, before Base Band Unit is transferred to, it is also possible to enter
The treatment such as row data serioparallel exchange, data CPRI framing, Base Band Unit is after the frequency domain data is received, it is also possible to carry out corresponding
Data serioparallel exchange, the data CPRI solution treatment such as frame, then carry out Base-Band Processing.
The data transmission method of the application, by the data processing stream changed between Base Band Unit and remote radio unit (RRU)
Journey, script is carried out in Base Band Unit to be changed to be carried out in remote radio unit (RRU) the step of data time-domain and frequency-domain is changed, that is, change
The position of the IR interfaces between Base Band Unit and remote radio unit (RRU).By this kind of mode, make Base Band Unit and far end radio frequency
The data transmitted between unit are frequency domain data, because for time domain data, every millisecond of frequency domain data is 1200 × 15
Individual OFDM symbol, and every millisecond of time domain data is 2048 × 15 OFDM symbols, namely using the data volume of frequency domain data transmission
It is the 59% (1200/2048) of the data volume transmitted using time domain data.Therefore, it is transmitted using frequency domain data, relative to
It is converted into for time domain data, in the case where not being compressed to data, it is possible to reduce Base Band Unit and far end radio frequency
The transmitted data amount of unit, such that it is able to reduce transmission cost, reduces the demand to bandwidth.
Equally, under identical compression factor, it also can be to time domain data that the data volume for obtaining is compressed to frequency domain data
It is compressed the 59% of the data volume for obtaining.Therefore, it can draw, if keeping data volume constant, then to the pressure of frequency domain data
Contracting ratio can then be less than the compression factor to time domain data, when compression factor is smaller, its number produced because of data compression
Can also be reduced according to loss, thereby may be ensured that the complete and accuracy of data transfer.
Reference picture 3, shows the distributed base station embodiment one of the application, including Base Band Unit 10 and remote radio unit (RRU)
30.Wherein, the data transmitted between the Base Band Unit 10 and remote radio unit (RRU) 30 are frequency domain data.Remote radio unit (RRU) 30 is wrapped
Time-domain and frequency-domain modular converter 31 is included, for carrying out time-domain and frequency-domain conversion to data.Preferably, time-domain and frequency-domain modular converter includes fast
Fast Fourier transform unit or discrete Fourier transform unit.With by Fast Fourier Transform (FFT) or discrete Fourier transform come real
The time-domain and frequency-domain conversion of existing data.
Reference picture 4, shows the distributed base station embodiment two of the application, and Base Band Unit 10 includes the He of data processing module 11
Remote radio unit (RRU) 30 includes data processing module 33.Data processing module 11,33 is used to carry out the frequency domain data before transmission
Compression and the frequency domain data after the compression that receives is decompressed.
Reference picture 5, shows in the distributed base station of the application data processing stream between Base Band Unit and remote radio unit (RRU)
Cheng Tu.Illustrated so that Base Band Unit transfers data to remote radio unit (RRU) as an example.
By the I/Q data (frequency domain data) after Base-Band Processing, carried out in Base Band Unit data compression, data CPRI into
After frame and data serioparallel exchange, Optical Fiber Transmission is carried out to remote radio unit (RRU) by IR interfaces.
Remote radio unit (RRU) carries out data serioparallel exchange, data CPRI solution frame and data solution to the frequency domain data for receiving
After pressure, carry out fast Fourier (FFT) conversion obtain time domain data, then the time domain data is carried out Digital IF Processing and
Follow-up process.
It is appreciated that if remote radio unit (RRU) transfers data to Base Band Unit, its process is the inverse of aforementioned process
Process, will not be repeated here.
It is appreciated that the distributed base station of the application is changed by the time-domain and frequency-domain conversion process by script in Base Band Unit
In remote radio unit (RRU), so that the data of transmission become frequency domain data by time domain data.As it was previously stated, using frequency domain
The data volume of data transfer is the 59% of the data volume transmitted using time domain data.Therefore, it is transmitted using frequency domain data, phase
For being converted into time domain data, in the case where not being compressed to data, it is possible to reduce Base Band Unit and distal end
The transmitted data amount of radio frequency unit, such that it is able to reduce transmission cost, reduces the demand to bandwidth.
When implementing, because it is by software logic control realization, remote to carry out time-domain and frequency-domain conversion for data
Increase in the radio frequency unit of end time-domain and frequency-domain modular converter only need to be realized by modifying software logic Base Band Unit and
The change of the IR interface positions between remote radio unit (RRU), so that the flow chart of data processing in distributed base station changes.
It is therefore not necessary to carry out the upgrading of hardware, but can be that significant reduction Base Band Unit and remote radio unit (RRU) pass through Optical Fiber Transmission
Data volume, and the integrality and accuracy of data can be ensured, such that it is able to reduce data transfer cost.
As seen through the above description of the embodiments, those skilled in the art can be understood that the application can
Realized by the mode of software plus required general hardware platform.Based on such understanding, the technical scheme essence of the application
On the part that is contributed to prior art in other words can be embodied in the form of software product, the computer software product
Can store in storage medium, such as ROM/RAM, magnetic disc, CD, including some instructions are used to so that a computer equipment
(can be personal computer, server, or network equipment etc.) performs some of each embodiment of the application or embodiment
Method described in part.
Each embodiment in this specification is described by the way of progressive, identical similar portion between each embodiment
Divide mutually referring to what each embodiment was stressed is the difference with other embodiment.Especially for device or
For system embodiment, because it is substantially similar to embodiment of the method, so describing fairly simple, related part is referring to method
The part explanation of embodiment.Device and distributed base station embodiment described above is only schematical, wherein institute
State that the unit illustrated as separating component can be or may not be physically separate, the part shown as unit can
To be or may not be physical location, you can with positioned at a place, or can also be distributed on multiple NEs.
Some or all of module therein can be according to the actual needs selected to realize the purpose of this embodiment scheme.This area is general
Logical technical staff is without creative efforts, you can to understand and implement.
Data transmission method and distributed base station provided herein are described in detail above, it is used herein
Specific case is set forth to the principle and implementation method of the application, and the explanation of above example is only intended to help and understands
The present processes and its core concept；Simultaneously for those of ordinary skill in the art, according to the thought of the application, in tool
Be will change in body implementation method and range of application, in sum, this specification content should not be construed as to the application
Limitation.
Claims (7)
1. a kind of data transmission method, for the data transfer between the Base Band Unit and remote radio unit (RRU) of distributed base station,
It is characterised in that it includes the data transmitted between the Base Band Unit and remote radio unit (RRU) are frequency domain data, in the distal end
Time-domain and frequency-domain conversion is carried out to data in radio frequency unit；Before being additionally included in frequency domain data, the frequency domain data is carried out
Compression；Wherein, the frequency domain data is transferred to remote radio unit (RRU) and includes by Base Band Unit：At in Base Band Unit by base band
Frequency domain data after reason is transferred to remote radio unit (RRU) by IR interfaces；Remote radio unit (RRU) is changed to the frequency domain data
Obtain time domain data.
2. data transmission method as claimed in claim 1, it is characterised in that methods described also includes：
After the frequency domain data after receiving compression, the frequency domain data after the compression is decompressed.
3. data transmission method as claimed in claim 1 or 2, it is characterised in that the frequency domain data is by remote radio unit (RRU)
Base Band Unit is transferred to, the data transmission method includes：
Remote radio unit (RRU) by the time domain data after Digital IF Processing to carrying out being converted to frequency domain data；
The frequency domain data is transferred to Base Band Unit by IR interfaces.
4. data transmission method as claimed in claim 1 or 2, it is characterised in that described that time-domain and frequency-domain conversion is carried out to data
Including：
Realized using Fast Fourier Transform (FFT) or discrete Fourier transform.
5. a kind of distributed base station, including Base Band Unit and remote radio unit (RRU), it is characterised in that the Base Band Unit and distal end
The data transmitted between radio frequency unit are frequency domain data, and the remote radio unit (RRU) includes time-domain and frequency-domain modular converter, for right
Data carry out time-domain and frequency-domain conversion；The Base Band Unit and remote radio unit (RRU) include data processing module, before to transmission
Frequency domain data be compressed；Wherein, the frequency domain data is transferred to remote radio unit (RRU) and includes by Base Band Unit：By base band list
Remote radio unit (RRU) is transferred to by IR interfaces by the frequency domain data after Base-Band Processing in unit；Remote radio unit (RRU) is to the frequency
Numeric field data carries out being converted to time domain data.
6. distributed base station as claimed in claim 5, it is characterised in that the data processing module, is additionally operable to receiving
Compression after frequency domain data decompressed.
7. distributed base station as claimed in claim 5, it is characterised in that the time-domain and frequency-domain modular converter includes：
Fast Fourier Transform (FFT) unit or discrete Fourier transform unit.
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| CN201210272743.5A CN102801681B (en) | 2012-08-01 | 2012-08-01 | Data transmission method and distributed base station |
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| CN201210272743.5A CN102801681B (en) | 2012-08-01 | 2012-08-01 | Data transmission method and distributed base station |
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| CN102801681B true CN102801681B (en) | 2017-06-06 |
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| CN104702369B (en) * | 2013-12-06 | 2019-10-11 | 中兴通讯股份有限公司 | A kind of method and device handling signal sampling point data |
| CN106550397B (en) * | 2015-09-17 | 2020-04-14 | 华为技术有限公司 | Method, apparatus and system for transmitting wireless data |
| US20170338866A1 (en) * | 2016-05-19 | 2017-11-23 | Hon Hai Precision Industry Co., Ltd | Method and apparatus for data reduction of a communication system |
| CN107528669B (en) * | 2016-06-22 | 2021-11-12 | 中兴通讯股份有限公司 | Data transmission method and microwave transmission device |
| CN110832949B (en) * | 2017-07-28 | 2021-08-20 | 华为技术有限公司 | Data dimensionality reduction method, device and system, computer equipment and storage medium |
| US20200408840A1 (en) * | 2019-06-28 | 2020-12-31 | Regal Beloit America, Inc. | Health monitor circuit for an electric machine |
| CN111682903B (en) * | 2020-06-09 | 2021-09-07 | 武汉虹信科技发展有限责任公司 | Data transmission method, interface unit, radio remote unit and wireless access system |
| CN115226151B (en) * | 2021-04-21 | 2025-02-14 | 大唐移动通信设备有限公司 | A data transmission method, base station, device and storage medium |
| CN113242243A (en) * | 2021-05-12 | 2021-08-10 | 江苏亨鑫众联通信技术有限公司 | Super-bandwidth signal transmission method and system |
| CN114089219A (en) * | 2021-11-10 | 2022-02-25 | 国网辽宁省电力有限公司本溪供电公司 | Novel conduction test device for telemetering ground net |
| CN114466086B (en) * | 2021-12-31 | 2025-03-04 | 华为技术有限公司 | A data transmission method, a communication device and a communication system |
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| CN101106766B (en) * | 2007-07-18 | 2010-06-02 | 华为技术有限公司 | Distributed base station, indoor unit and outdoor unit of distributed base station |
| CN101136811A (en) * | 2007-09-28 | 2008-03-05 | 中兴通讯股份有限公司 | OFDM transmission signal processing equipment, method and radio frequency far-end unit |
| CN102546504B (en) * | 2010-12-21 | 2014-07-09 | 华为技术有限公司 | Frequency domain transmission method and device |
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