CN107517503A - A kind of processing unit, BBU, RRU and antenna correcting method - Google Patents
A kind of processing unit, BBU, RRU and antenna correcting method Download PDFInfo
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
- H04W88/08—Access point devices
- H04W88/085—Access point devices with remote components
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/24—Radio transmission systems, i.e. using radiation field for communication between two or more posts
- H04B7/26—Radio transmission systems, i.e. using radiation field for communication between two or more posts at least one of which is mobile
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B17/00—Monitoring; Testing
- H04B17/10—Monitoring; Testing of transmitters
- H04B17/11—Monitoring; Testing of transmitters for calibration
- H04B17/12—Monitoring; Testing of transmitters for calibration of transmit antennas, e.g. of the amplitude or phase
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
- H04B7/0413—MIMO systems
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
- H04W88/08—Access point devices
Abstract
The embodiment of the invention discloses a kind of processing unit, BBU, RRU and antenna correcting method, the processing unit includes：First processing units and second processing unit；Wherein, the first processing units are located in Base Band Unit BBU, the second processing unit is located in RF remote unit RRU, the first processing units and the second processing unit are connected by the interface between the BBU and the RRU, the interface is used to transmitting that the BBU to be carried out after resource units RE mappings and the RRU carries out the downlink data before uplink/downlink antenna correction, and the RRU is carried out after uplink antenna correction and the BBU carries out the upstream data before RE inverse mappings.
Description
Technical field
The present invention relates to wireless communication field antenna calibration technology, more particularly to a kind of processing unit, BBU, RRU and antenna
Bearing calibration.
Background technology
Large-scale antenna array system (Massive MIMO) be following 5th generation (5G) mobile communication key technology it
One, channel capacity can not only be improved using Massive MIMO technologies, but also can effectively suppress intra-cell interference and
Inter-cell interference.Antenna calibration is Massive MIMO basis, and the core algorithm of smart antenna requires that system accurately obtains
The array manifold being made up of whole smart antennas, and in the large-scale antenna array system of reality, each smart antenna has
There may be certain error, it is therefore desirable to the uplink antenna and uplink/downlink antenna for producing error are corrected, so as to make
Each smart antenna can efficiently control beam direction and shape, realize that intelligence transmitting and intelligence receive.
Distributed base station is also the communication base station of the main use of following 5G mobile communication, by Base Band Unit (Base Band
Unit, BBU) and RF remote unit (Remote Radio Unit, RRU) composition.Distributed base station is that one kind can flexibly pacify
The base station combination of dress, data interaction is carried out by interface between BBU and RRU.Fig. 1 is existing BBU and RRU composition structural representation
Figure, as shown in figure 1, current BBU and RRU division is using the data intermediate frequency module that base band data enters in RRU as boundary,
The data transmitted on interface so between BBU and RRU, I datum and Q numbers not only including data intermediate frequency module before processing
According to hereinafter referred to as I/Q data；But also including the antenna calibration sequence for being corrected to each antenna to be corrected.
During the present invention is realized, inventor has found that at least there are the following problems in the prior art：
Divided according to the function of BBU and RRU in existing distributed base station, the interface between BBU and RRU can be caused for number
Can be very big according to the bandwidth demand of transmission, so need to take substantial amounts of fiber resource, the stability to BBU and RRU is brought very
Big hidden danger.
The content of the invention
To solve existing technical problem, the embodiment of the present invention provides a kind of processing unit, BBU, RRU and antenna school
Correction method, the data throughout that can be substantially reduced on BBU and RRU interface, so as to enter between effectively reduction BBU and RRU
The cost of row data transfer, and BBU and RRU stability can be increased.
To reach above-mentioned purpose, what the technical scheme of the embodiment of the present invention was realized in：
The embodiments of the invention provide a kind of processing unit, the processing unit includes：At first processing units and second
Manage unit；Wherein,
The first processing units are located in BBU, and the second processing unit is located in RRU, the first processing units
It is connected with the second processing unit by the interface between the BBU and the RRU, the interface is used to transmit the BBU
After progress resource units RE mappings and the RRU carries out the downlink data before uplink/downlink antenna correction, and the RRU enters
After the correction of row uplink antenna and the BBU carries out the upstream data before RE inverse mappings.
In the above-described embodiments, the first processing units include：Coding module, baseband modulation mould for down direction
Block and resource mapping module；The second processing unit includes：For in the antenna calibration module and inverse quick Fu of down direction
Leaf transformation IFFT modules；Wherein,
The coding module, the downlink data for being sent to receiving the MAC entity pre-set in the BBU are carried out
Channel coding, the downlink data after channel coding is sent to the baseband-modem module；
The baseband-modem module, for carrying out baseband modulation to the downlink data after channel coding, after baseband modulation
Downlink data be sent to the resource mapping module；
The resource mapping module, for carrying out resource units RE mapping to the downlink data after baseband modulation, it will reflect
Downlink data after penetrating is sent to the antenna calibration module by the interface；
The antenna calibration module, for carrying out uplink/downlink antenna correction to the downlink data after mapping, under after correction
Row data are sent to the IFFT modules；
The IFFT modules, for carrying out inverse fast fourier transform to the downlink data after correction, and add cyclic prefix,
The downlink data after cyclic prefix will be added to be sent to the data intermediate frequency module pre-set in the RRU.
In the above-described embodiments, the first processing units also include：Decoding module, base band demodulating for up direction
Module and resource inverse mapping module；The second processing unit also includes：For the antenna calibration module of up direction and quick
Fourier transformation FFT module；Wherein,
The FFT module, the upstream data for being sent to receiving the data intermediate frequency module remove cyclic prefix, gone forward side by side
Row Fast Fourier Transform (FFT), the upstream data after Fast Fourier Transform (FFT) is sent to the antenna calibration module；
The antenna calibration module, will for carrying out uplink antenna correction to the upstream data after Fast Fourier Transform (FFT)
Upstream data after correction is sent to the resource inverse mapping module by the interface；
The resource inverse mapping module, for carrying out RE inverse mapping to the upstream data after correction, after inverse mapping
Upstream data is sent to the base band demodulating module；
The base band demodulating module, for carrying out channel estimation, equilibrium and base band demodulating to the upstream data after inverse mapping,
Upstream data after base band demodulating is sent to the decoding module；
The decoding module, for entering row decoding to the upstream data after base band demodulating, the upstream data after decoding is sent out
Give the MAC entity.
The embodiment of the present invention additionally provides a kind of BBU, and the BBU includes：At service protocol entity, MAC entity and first
Unit is managed, the first processing units are connected by the interface between the BBU and RRU with the RRU, and the interface is used to pass
After the defeated BBU progress RE mappings and the RRU carries out the downlink data before uplink/downlink antenna correction, and the RRU enters
After the correction of row uplink antenna and the BBU carries out the upstream data before RE inverse mappings.
In the above-described embodiments, the first processing units include：Coding module, baseband modulation mould for down direction
Block and resource mapping module；Wherein,
The coding module, the downlink data for being sent to receiving the MAC entity carries out channel coding, by channel
Downlink data after coding is sent to the baseband-modem module；
The baseband-modem module, for carrying out baseband modulation to the downlink data after channel coding, after baseband modulation
Downlink data be sent to the resource mapping module；
The resource mapping module, will be descending after mapping for carrying out RE mappings to the downlink data after baseband modulation
Data are sent to the RRU by the interface.
In the above-described embodiments, the first processing units also include：Decoding module, base band demodulating for up direction
Module and resource inverse mapping module；Wherein,
The resource inverse mapping module, the upstream data for being sent to receiving the RRU carry out RE inverse mappings, will be inverse
Upstream data after mapping is sent to the base band demodulating module；
The base band demodulating module, for carrying out channel estimation, equilibrium and base band demodulating to the upstream data after inverse mapping,
Upstream data after base band demodulating is sent to the decoding module；
The decoding module, for entering row decoding to the upstream data after base band demodulating, the upstream data after decoding is sent out
Give the MAC entity.
The embodiment of the present invention additionally provides a kind of RRU, and the RRU includes：Second processing unit, digital intermediate frequency unit and penetrate
Frequency unit, the second processing unit are connected by the interface between BBU and the RRU with the BBU, and the interface is used to pass
After the defeated BBU progress RE mappings and the RRU carries out the downlink data before uplink/downlink antenna correction, and the RRU enters
After the correction of row uplink antenna and the BBU carries out the upstream data before RE inverse mappings.
In the above-described embodiments, the second processing unit, including：Antenna calibration module and IFFT for down direction
Module；Wherein,
The antenna calibration module, the downlink data for being sent to receiving the BBU carry out uplink/downlink antenna correction, will
Downlink data after correction is sent to the IFFT modules；
The IFFT modules, for carrying out inverse fast fourier transform to the downlink data after correction, and add cyclic prefix,
The downlink data after cyclic prefix will be added to be sent to the data intermediate frequency module.
In the above-described embodiments, the second processing unit, in addition to：For up direction antenna calibration module and
FFT module；Wherein,
The FFT module, the upstream data for being sent to receiving the data intermediate frequency module remove cyclic prefix, gone forward side by side
Row Fast Fourier Transform (FFT), the upstream data after Fast Fourier Transform (FFT) is sent to the antenna calibration module；
The antenna calibration module, will for carrying out uplink antenna correction to the upstream data after Fast Fourier Transform (FFT)
Upstream data after correction is sent to the BBU.
The embodiment of the present invention additionally provides a kind of antenna correcting method, and methods described includes：
Second processing unit in RRU sends antenna calibration sequence corresponding with each antenna to be corrected to radio frequency unit
Row；
The each antenna calibration sequence received is returned to institute by the radio frequency unit by the coupling networking pre-set
State second processing unit；
Each antenna calibration sequence pair that the second processing unit returns according to the radio frequency unit is each to be corrected
Antenna is corrected.
In the above-described embodiments, the antenna calibration sequence includes：Up correction sequence and descending correction sequence.
In the above-described embodiments, each antenna calibration sequence that the second processing unit returns according to the radio frequency unit
Each antenna to be corrected is corrected including：
Each up correction sequence that the second processing unit returns according to the radio frequency unit is to each to be corrected
Uplink antenna carries out uplink antenna correction；
Each descending correction sequence that the second processing unit returns according to the radio frequency unit is to each to be corrected
Uplink/downlink antenna carries out uplink/downlink antenna correction.
As can be seen here, in the technical scheme of the embodiment of the present invention, the first processing units in processing unit are located at BBU
In, second processing unit is located in RRU, and first processing units and second processing unit are connected by the interface between BBU and RRU
Connecing, the interface can be only used for after transmission BBU progress RE mappings and RRU carries out the downlink data before uplink/downlink antenna correction,
And the upstream data after RRU progress uplink antenna corrections and before BBU progress RE inverse mappings, without transmission antenna
Correction sequence, also, the downlink data also without transmission by the IFFT redundancies brought, and by the upper of the FFT redundancies brought
Row data.That is, in the technical scheme that the embodiment of the present invention proposes, can be by the function of processing unit in existing BBU
Again in BBU with being divided in RRU, i.e.,：Second processing unit in existing BBU will be arranged in RRU.As can be seen here,
The technical scheme that the embodiment of the present invention proposes, the data throughout that can be substantially reduced on the interface between BBU and RRU, so as to
The cost carried out data transmission between BBU and RRU is effectively reduced, and BBU and RRU stability can be increased；Also, implement
It is simple and convenient, it is easy to popularize, the scope of application is wider.
Brief description of the drawings
Fig. 1 is existing BBU and RRU composition structural representation；
Fig. 2 is the composition structural representation of processing unit in the embodiment of the present invention；
Fig. 3 is the composition structural representation of BBU in the embodiment of the present invention；
Fig. 4 is the composition structural representation of RRU in the embodiment of the present invention；
Fig. 5 is the implementation process schematic diagram of antenna correcting method in the embodiment of the present invention.
Embodiment
In various embodiments of the present invention, Fig. 2 is the composition structural representation of processing unit in the embodiment of the present invention, such as
Shown in Fig. 2, processing unit includes：First processing units and second processing unit；Wherein,
First processing units are located in BBU, and second processing unit is located in RRU, first processing units and second processing list
Member is connected by interface between BBU and RRU, the interface be used to transmitting BBU carry out after RE mappings and RRU carry out it is descending
It is upper after downlink data before antenna calibration, and RRU progress uplink antenna corrections and before BBU progress RE inverse mappings
Row data.
Extensive antenna is an important developing direction in following 5G communications, but with the increase of antenna amount, is pressed
Divided according to the function of BBU and RRU in existing distributed base station, then can cause the interface between BBU and RRU for data transfer
Bandwidth demand can be very big.By taking the array system of 32 antennas as an example, it is assumed that a width of 20MHz of band that each antenna takes, sampling speed
Rate is 30.72M/s, and the bit wide of I signal bit wide and Q signal is 15bit, then the interface rate between BBU and RRU is：Interface speed
Rate=(bit wide of bit wide+Q data of I datum) × sampling rate × antenna number × 10/8 × 16/15, about 40Gbps；Wherein,
10/8 is the optical port redundancy of coding-belt, and 16/15 is the redundancy that control word is brought.
But BBU and RRU interface rate situations in single carrier list cell are only considered in calculating above, and following 5G
Mobile communication would is that multicarrier multiple cell, and in multi-carrier district, the demand of the interface rate between BBU and RRU will be more
Greatly, therefore, divided according to the function of BBU and RRU in existing distributed base station, the interface between BBU and RRU not only needs to take
Substantial amounts of fiber resource, and the realization of multi-antenna technology is become extremely difficult, the stability to BBU and RRU is brought
Very big hidden danger.
In a particular embodiment of the present invention, can by the function of processing unit in existing BBU again BBU and RRU it
Between divided, i.e.,：Second processing unit in existing BBU is arranged in RRU, the interface between such BBU and RRU can be with
It is only used for after transmission BBU progress RE mappings and RRU carries out the downlink data before uplink/downlink antenna correction, and RRU is carried out
After row antenna calibration and BBU carries out the upstream data before RE inverse mappings, without transmission antenna correction sequence, also,
Downlink data also without transmission by the IFFT redundancies brought, and the upstream data by the FFT redundancies brought.Therefore, originally
The technical scheme that inventive embodiments propose, the data throughout that can be substantially reduced on the interface between BBU and RRU, so as to have
Effect reduces the cost carried out data transmission between BBU and RRU, and can increase BBU and RRU stability.
Specifically, first processing units can include：Coding module, baseband-modem module and resource for down direction
Mapping block；The second processing unit includes：Antenna calibration module and IFFT modules for down direction；Wherein,
Coding module, the downlink data for being sent to receiving the MAC entity pre-set in BBU carry out channel volume
Code, baseband-modem module is sent to by the downlink data after channel coding；
Baseband-modem module, for carrying out baseband modulation to the downlink data after channel coding, under after baseband modulation
Row data are sent to resource mapping module；
Resource mapping module, for carrying out resource units RE mapping to the downlink data after baseband modulation, after mapping
Downlink data antenna calibration module is sent to by interface；
Antenna calibration module, for carrying out uplink/downlink antenna correction to the downlink data after mapping, by the lower line number after correction
According to being sent to IFFT modules；
IFFT modules, for carrying out inverse fast fourier transform to the downlink data after correction, and add cyclic prefix, will add
Downlink data after cyclic prefix is sent to the data intermediate frequency module pre-set in RRU.
By the coding module, baseband-modem module and the resource impact mould that are used for down direction in above-mentioned first processing units
It is used for the antenna calibration module and IFFT modules of down direction in block, and second processing unit, can be to receiving in BBU
The downlink data that MAC entity is sent is respectively channel encoded, baseband modulation, RE mapping, and uplink/downlink antenna school is forward and inverse fast
Fast Fourier transformation and plus cyclic prefix, the data intermediate frequency module being then sent in RRU.
In a particular embodiment of the present invention, the first processing units can also include：Decoding for up direction
Module, base band demodulating module and resource inverse mapping module；The second processing unit also includes：Antenna school for up direction
Positive module and FFT module；Wherein,
FFT module, for removing cyclic prefix to the upstream data for receiving data intermediate frequency module transmission, and carry out quick Fu
In leaf transformation, the upstream data after Fast Fourier Transform (FFT) is sent to antenna calibration module；
Antenna calibration module, for carrying out uplink antenna correction to the upstream data after Fast Fourier Transform (FFT), it will correct
Upstream data afterwards is sent to resource inverse mapping module by interface；
Resource inverse mapping module, will be up after inverse mapping for carrying out RE inverse mapping to the upstream data after correction
Data are sent to base band demodulating module；
Base band demodulating module, for carrying out channel estimation, equilibrium and base band demodulating to the upstream data after inverse mapping, by base
Decoding module is sent to the upstream data after demodulation；
Decoding module, for entering row decoding to the upstream data after base band demodulating, the upstream data after decoding is sent to
MAC entity.
By the decoding module, base band demodulating module and the resource inverse mapping that are used for up direction in above-mentioned first processing units
It is used for the antenna calibration module and FFT module of up direction in module, and second processing unit, can be to receiving in numeral
The upstream data that frequency module is sent carries out cyclic prefix, Fast Fourier Transform (FFT), uplink antenna correction respectively, and RE's is inverse
Mapping, channel estimation, equilibrium, base band demodulating and decoding, the MAC entity being then sent in BBU.
It should be noted that in a particular embodiment of the present invention, the down direction can be：BBU to RRU side
To；The up direction can be：RRU to BBU direction.
The processing unit of the embodiment of the present invention, can be by the function of processing unit in existing BBU again in BBU and RRU
Divided, i.e.,：Second processing unit in existing BBU will be arranged in RRU, therefore, the interface between BBU and RRU can
Carried out with the downlink data being only used for after transmission BBU progress RE mappings and before RRU progress uplink/downlink antenna corrections, and RRU
After uplink antenna correction and BBU carries out the upstream data before RE inverse mappings, without transmission antenna correction sequence, and
And, it is not required that transmit the downlink data by the IFFT redundancies brought, and the upstream data by the FFT redundancies brought.Thus
It can be seen that the technical scheme that the embodiment of the present invention proposes, the data throughout that can be substantially reduced on the interface between BBU and RRU,
So as to effectively reduce the cost carried out data transmission between BBU and RRU, and BBU and RRU stability can be increased；Also, realize
Get up simple and convenient, be easy to popularize, the scope of application is wider.
Fig. 3 is the composition structural representation of BBU in the embodiment of the present invention, as shown in figure 3, the BBU can include：Business
Protocol entity, MAC entity and first processing units；Wherein, first processing units pass through the interface between BBU and RRU and RRU phases
Even, the interface be used for transmit BBU carry out RE mappings after and RRU carry out uplink/downlink antenna correction before downlink data, and
After RRU progress uplink antenna corrections and BBU carries out the upstream data before RE inverse mappings.
In a particular embodiment of the present invention, can be by the function of processing unit in existing BBU again in BBU and RRU
Divided, can be only included in such BBU：Service protocol entity, MAC entity and first processing units, without including：Second
Processing unit, therefore, the interface between BBU and RRU can be only used for after transmission BBU progress RE mappings and RRU progress is descending
It is upper after downlink data before antenna calibration, and RRU progress uplink antenna corrections and before BBU progress RE inverse mappings
Row data, without transmission antenna correction sequence, also, the downlink data also without transmission by the IFFT redundancies brought,
And the upstream data by the FFT redundancies brought.
Specifically, first processing units can also include：Coding module, baseband-modem module and money for down direction
Source mapping block；Wherein,
Coding module, for carrying out channel coding to the downlink data for receiving MAC entity transmission, after channel coding
Downlink data is sent to baseband-modem module；
Baseband-modem module, for carrying out baseband modulation to the downlink data after channel coding, under after baseband modulation
Row data are sent to resource mapping module；
Resource mapping module, for carrying out RE mapping to the downlink data after baseband modulation, by the downlink data after penetrating
RRU is sent to by interface.
By the first processing units in above-mentioned BBU, the downlink data for receiving MAC entity transmission can be carried out respectively
The mapping of channel coding, baseband modulation, RE, then the downlink data after mapping is sent to by the interface between BBU and RRU
RRU。
In a particular embodiment of the present invention, first processing units can also include：Decoding module for up direction,
Base band demodulating module and resource inverse mapping module；Wherein,
Resource inverse mapping module, for carrying out RE inverse mapping to the upstream data for receiving RRU transmissions, after inverse mapping
Upstream data be sent to base band demodulating module；
Base band demodulating module, for carrying out channel estimation, equilibrium and base band demodulating to the upstream data after inverse mapping, by base
Decoding module is sent to the upstream data after demodulation；
Decoding module, for entering row decoding to the upstream data after base band demodulating, the upstream data after decoding is sent to
MAC entity.
The BBU that the embodiment of the present invention proposes, can be only included：Service protocol entity, MAC entity and first processing units,
Without including：Second processing unit.That is, in the technical scheme that the embodiment of the present invention proposes, can be by existing BBU
The function of processing unit in RRU again in BBU with being divided, i.e.,：Second processing unit in existing BBU will be arranged on
In RRU, therefore, the interface between BBU and RRU can be only used for after transmission BBU progress RE mappings and RRU carries out descending day
It is up after downlink data before line correction, and RRU progress uplink antenna corrections and before BBU progress RE inverse mappings
Data, without transmission antenna correction sequence, also, the downlink data also without transmission by the IFFT redundancies brought, with
And the upstream data by the FFT redundancies brought.As can be seen here, the BBU proposed in the embodiment of the present invention, can be substantially reduced BBU
The data throughout on interface between RRU, so as to effectively reduce the cost carried out data transmission between BBU and RRU, and energy
Increase BBU and RRU stability；Also, implement simple and convenient, be easy to popularize, the scope of application is wider.
Fig. 4 is the composition structural representation of RRU in the embodiment of the present invention, as shown in figure 4, the RRU can include：Second
Processing unit, digital intermediate frequency unit and radio frequency unit；Wherein, second processing unit passes through the interface and BBU between BBU and RRU
Be connected, the interface be used for transmit BBU carry out RE mappings after and RRU carry out uplink/downlink antenna correction before downlink data, with
And the upstream data after RRU progress uplink antenna corrections and before BBU progress RE inverse mappings.
In a particular embodiment of the present invention, can be by the function of processing unit in existing BBU again in BBU and RRU
Divided, can be only included in such BBU：Service protocol entity, MAC entity and first processing units, without including：Second
Processing unit, therefore, the interface between BBU and RRU can be only used for after transmission BBU progress RE mappings and RRU progress is descending
It is upper after downlink data before antenna calibration, and RRU progress uplink antenna corrections and before BBU progress RE inverse mappings
Row data, without transmission antenna correction sequence, also, the downlink data also without transmission by the IFFT redundancies brought,
And the upstream data by the FFT redundancies brought.
Specifically, second processing unit can also include：Antenna calibration module and IFFT modules for down direction；Its
In,
Antenna calibration module, for carrying out uplink/downlink antenna correction to the downlink data for receiving BBU transmissions, by antenna calibration
Downlink data afterwards is sent to IFFT modules；
IFFT modules, for carrying out inverse fast fourier transform to the downlink data after antenna calibration, and add cyclic prefix,
The downlink data after cyclic prefix will be added to be sent to data intermediate frequency module.
By the second processing unit in above-mentioned RRU, the downlink data for receiving BBU transmissions can be carried out respectively descending
Antenna calibration, inverse fast fourier transform and add cyclic prefix, then the downlink data after cyclic prefix will be added to be sent to numeral
Ifd module.
In a particular embodiment of the present invention, second processing unit can also include：Antenna calibration for up direction
Module and FFT module；Wherein,
FFT module, for removing cyclic prefix to the upstream data for receiving data intermediate frequency module transmission, and carry out quick Fu
In leaf transformation, the upstream data after Fast Fourier Transform (FFT) is sent to antenna calibration module；
Antenna calibration module, for carrying out uplink antenna correction to the upstream data after Fast Fourier Transform (FFT), by antenna
Upstream data after correction is sent to BBU.
The RRU that the embodiment of the present invention proposes, can include：Second processing unit, digital intermediate frequency unit and radio frequency unit.
That is in the technical scheme that the embodiment of the present invention proposes, can be by the function of processing unit in existing BBU again in BBU
With being divided in RRU, i.e.,：Second processing unit in existing BBU will be arranged in RRU, therefore, between BBU and RRU
Interface can be only used for after transmission BBU progress RE mappings and RRU carries out the downlink data before uplink/downlink antenna correction, and
After RRU progress uplink antenna corrections and BBU carries out the upstream data before RE inverse mappings, is corrected without transmission antenna
Sequence, also, the downlink data also without transmission by the IFFT redundancies brought, and the upper line number by the FFT redundancies brought
According to.As can be seen here, the RRU proposed in the embodiment of the present invention, the data that can be substantially reduced on the interface between BBU and RRU gulp down
The amount of telling, so as to effectively reduce the cost carried out data transmission between BBU and RRU, and BBU and RRU stability can be increased；And
And implement simple and convenient, it is easy to popularize, the scope of application is wider.
In actual applications, first processing units and the second processing unit can be by the center in BBU and RRU
Processor (CPU), microprocessor (MPU), digital signal processor (DSP) or field programmable gate array (FPGA) etc. are realized.
Fig. 5 is the implementation process schematic diagram of antenna correcting method in the embodiment of the present invention, as shown in figure 5, antenna calibration side
Method may comprise steps of：
Second processing unit in step 501, RRU sends antenna corresponding with each antenna to be corrected to radio frequency unit
Correction sequence.
In a particular embodiment of the present invention, it may be predetermined that antenna calibration sequence corresponding with each antenna to be corrected
Row.Wherein, the antenna calibration sequence can include：Up correction sequence and descending correction sequence.
In this step, the second processing unit in RRU can be sent and each up day to be corrected to radio frequency unit
Up correction sequence corresponding to line；Descending correction corresponding with each uplink/downlink antenna to be corrected can also be sent to radio frequency unit
Sequence.Specifically, in a particular embodiment of the present invention, can be by the antenna calibration module in second processing unit to radio frequency
Unit sends antenna calibration sequence corresponding with each antenna to be corrected.
It is preferred that in a particular embodiment of the present invention, the second processing unit in RRU is to radio frequency unit transmission and respectively
Before up correction sequence corresponding to individual uplink antenna to be corrected, it can also comprise the following steps：
Step a, antenna calibration management entity transmission antenna correction of the antenna calibration management entity in BBU into RRU refers to
Show.
In this step, the antenna calibration management entity in BBU can pass through antenna calibration management of the control word into RRU
The correction instruction of entity transmission antenna.
Step b, the antenna calibration management entity in RRU is to second processing unit transmission antenna corrective command.
In a particular embodiment of the present invention, antenna calibration of the antenna calibration management entity in BBU is received in RRU
After the antenna calibration instruction that management entity is sent, the antenna calibration management entity in RRU can be sent to second processing unit
Antenna calibration order.Specifically, the antenna calibration order can include：Uplink antenna corrective command and uplink/downlink antenna correction life
Order.It is preferred that the uplink antenna corrective command can carry the antenna mark of each uplink antenna to be corrected, for indicating
Antenna calibration module needs to be corrected which uplink antenna；It is preferred that the uplink/downlink antenna corrective command can carry respectively
The antenna mark of individual uplink/downlink antenna to be corrected, for marker antenna correction module needs which uplink/downlink antenna be corrected.
Step 502, radio frequency unit return to each antenna calibration sequence received by the coupling networking pre-set
Give second processing unit.
In a particular embodiment of the present invention, radio frequency unit is receiving the up correction sequence of second processing unit transmission
Or after descending correction sequence, up correction sequence and descending correction sequence can be divided by the coupling networking pre-set
Second processing unit is not returned to.
Each antenna calibration sequence pair that step 503, second processing unit return according to radio frequency unit is each to be corrected
Antenna is corrected.
In a particular embodiment of the present invention, second processing unit can return to up correction sequence pair according to radio frequency unit
Each uplink antenna to be corrected is corrected；Can also be according to the descending correction sequence that radio frequency unit returns to each to be corrected
Uplink/downlink antenna be corrected.
Specifically, the antenna calibration sequence that second processing unit can return according to radio frequency unit, using existing antenna
Bearing calibration is corrected to each antenna to be corrected.For example, second processing unit can be according to the upper of radio frequency unit return
Row correction sequence calculates the uplink time delay offset of each uplink antenna to be corrected respectively, is then mended using each uplink time delay
Repay value and uplink antenna correction is carried out to each uplink antenna to be corrected；It is preferred that second processing unit can also be according to radio frequency
The descending correction sequence that unit returns calculates the descending delay compensation value of each uplink/downlink antenna to be corrected respectively, then using each
Individual descending delay compensation value carries out uplink/downlink antenna correction to each uplink/downlink antenna to be corrected.
It is preferred that in a particular embodiment of the present invention, second processing unit enters to uplink antenna all to be corrected
After the correction of row uplink antenna is completed, it can also be sent to the antenna calibration management entity in RRU for reporting uplink antenna school
The response message just completed；It is preferred that second processing unit is carrying out uplink/downlink antenna correction to uplink/downlink antenna all to be corrected
After completion, the response that the correction of user report uplink/downlink antenna is completed can also be sent to the antenna calibration management entity in RRU and is disappeared
Breath.
The antenna correcting method that the embodiment of the present invention proposes, it can be completed by the second processing unit in RRU to each
Antenna to be corrected is corrected.Because second processing unit is arranged in RRU, therefore the interface between BBU and RRU can be only
For transmit BBU carry out RE mappings after and RRU carry out uplink/downlink antenna correction before downlink data, and RRU carry out it is up
After antenna calibration and BBU carries out the upstream data before RE inverse mappings, without transmission antenna correction sequence, also,
It need not transmit by the downlink data of the IFFT redundancies brought, and the upstream data by the FFT redundancies brought.As can be seen here,
The technical scheme that the embodiment of the present invention proposes, the data throughout that can be substantially reduced on the interface between BBU and RRU, so as to
The cost carried out data transmission between BBU and RRU is effectively reduced, and BBU and RRU stability can be increased；Also, implement
It is simple and convenient, it is easy to popularize, the scope of application is wider.
It should be understood by those skilled in the art that, embodiments of the invention can be provided as method, system or computer program
Product.Therefore, the shape of the embodiment in terms of the present invention can use hardware embodiment, software implementation or combination software and hardware
Formula.Stored moreover, the present invention can use use which includes the computer of computer usable program code in one or more
The form for the computer program product that medium is implemented on (including but is not limited to magnetic disk storage and optical memory etc.).
The present invention is the flow with reference to method according to embodiments of the present invention, equipment (system) and computer program product
Figure and/or block diagram describe.It should be understood that can be by every first-class in computer program instructions implementation process figure and/or block diagram
Journey and/or the flow in square frame and flow chart and/or block diagram and/or the combination of square frame.These computer programs can be provided
The processors of all-purpose computer, special-purpose computer, Embedded Processor or other programmable data processing devices is instructed to produce
A raw machine so that produced by the instruction of computer or the computing device of other programmable data processing devices for real
The device for the function of being specified in present one flow of flow chart or one square frame of multiple flows and/or block diagram or multiple square frames.
These computer program instructions, which may be alternatively stored in, can guide computer or other programmable data processing devices with spy
Determine in the computer-readable memory that mode works so that the instruction being stored in the computer-readable memory, which produces, to be included referring to
Make the manufacture of device, the command device realize in one flow of flow chart or multiple flows and/or one square frame of block diagram or
The function of being specified in multiple square frames.
These computer program instructions can be also loaded into computer or other programmable data processing devices so that counted
Series of operation steps is performed on calculation machine or other programmable devices to produce computer implemented processing, so as in computer or
The instruction performed on other programmable devices is provided for realizing in one flow of flow chart or multiple flows and/or block diagram one
The step of function of being specified in individual square frame or multiple square frames.
The foregoing is only a preferred embodiment of the present invention, is not intended to limit the scope of the present invention.
Claims (12)
1. a kind of processing unit, it is characterised in that the processing unit includes：First processing units and second processing unit；Its
In,
The first processing units are located in Base Band Unit BBU, and the second processing unit is located in RF remote unit RRU,
The first processing units and the second processing unit are connected by the interface between the BBU and the RRU, the interface
For transmitting, the BBU is carried out after resource units RE mappings and the RRU carries out the lower line number before uplink/downlink antenna correction
According to, and the upstream data after RRU progress uplink antenna corrections and before BBU progress RE inverse mappings.
2. processing unit according to claim 1, it is characterised in that the first processing units include：For descending side
To coding module, baseband-modem module and resource mapping module；The second processing unit includes：Day for down direction
Line correction module and inverse fast fourier transform IFFT modules；Wherein,
The coding module, the downlink data for being sent to receiving the MAC entity pre-set in the BBU carry out channel
Coding, the baseband-modem module is sent to by the downlink data after channel coding；
The baseband-modem module, for carrying out baseband modulation to the downlink data after channel coding, under after baseband modulation
Row data are sent to the resource mapping module；
The resource mapping module, for carrying out resource units RE mapping to the downlink data after baseband modulation, after mapping
Downlink data the antenna calibration module is sent to by the interface；
The antenna calibration module, for carrying out uplink/downlink antenna correction to the downlink data after mapping, by the lower line number after correction
According to being sent to the IFFT modules；
The IFFT modules, for carrying out inverse fast fourier transform to the downlink data after correction, and add cyclic prefix, will add
Downlink data after cyclic prefix is sent to the data intermediate frequency module pre-set in the RRU.
3. processing unit according to claim 1, it is characterised in that the first processing units also include：For up
Decoding module, base band demodulating module and the resource inverse mapping module in direction；The second processing unit also includes：For up side
To antenna calibration module and Fast Fourier Transform (FFT) FFT module；Wherein,
The FFT module, the upstream data for being sent to receiving the data intermediate frequency module remove cyclic prefix, and carry out fast
Fast Fourier transformation, the upstream data after Fast Fourier Transform (FFT) is sent to the antenna calibration module；
The antenna calibration module, for carrying out uplink antenna correction to the upstream data after Fast Fourier Transform (FFT), it will correct
Upstream data afterwards is sent to the resource inverse mapping module by the interface；
The resource inverse mapping module, will be up after inverse mapping for carrying out RE inverse mapping to the upstream data after correction
Data are sent to the base band demodulating module；
The base band demodulating module, for carrying out channel estimation, equilibrium and base band demodulating to the upstream data after inverse mapping, by base
The decoding module is sent to the upstream data after demodulation；
The decoding module, for entering row decoding to the upstream data after base band demodulating, the upstream data after decoding is sent to
The MAC entity.
4. a kind of BBU, the BBU includes：Service protocol entity, MAC entity and first processing units, it is characterised in that described
First processing units are connected by the interface between the BBU and RRU with the RRU, and the interface enters for transmitting the BBU
After row RE mappings and the RRU carries out the downlink data before uplink/downlink antenna correction, and the RRU carries out uplink antenna
After correction and the BBU carries out the upstream data before RE inverse mappings.
5. BBU according to claim 4, it is characterised in that the first processing units include：Volume for down direction
Code module, baseband-modem module and resource mapping module；Wherein,
The coding module, the downlink data for being sent to receiving the MAC entity carries out channel coding, by channel coding
Downlink data afterwards is sent to the baseband-modem module；
The baseband-modem module, for carrying out baseband modulation to the downlink data after channel coding, under after baseband modulation
Row data are sent to the resource mapping module；
The resource mapping module, for carrying out RE mappings to the downlink data after baseband modulation, by the downlink data after mapping
The RRU is sent to by the interface.
6. BBU according to claim 4, it is characterised in that the first processing units also include：For up direction
Decoding module, base band demodulating module and resource inverse mapping module；Wherein,
The resource inverse mapping module, the upstream data for being sent to receiving the RRU carries out RE inverse mappings, by inverse mapping
Upstream data afterwards is sent to the base band demodulating module；
The base band demodulating module, for carrying out channel estimation, equilibrium and base band demodulating to the upstream data after inverse mapping, by base
The decoding module is sent to the upstream data after demodulation；
The decoding module, for entering row decoding to the upstream data after base band demodulating, the upstream data after decoding is sent to
The MAC entity.
7. a kind of RRU, the RRU includes：Second processing unit, digital intermediate frequency unit and radio frequency unit, it is characterised in that described
Second processing unit is connected by the interface between BBU and the RRU with the BBU, and the interface enters for transmitting the BBU
After row RE mappings and the RRU carries out the downlink data before uplink/downlink antenna correction, and the RRU carries out uplink antenna
After correction and the BBU carries out the upstream data before RE inverse mappings.
8. RRU according to claim 7, it is characterised in that the second processing unit, including：For down direction
Antenna calibration module and IFFT modules；Wherein,
The antenna calibration module, the downlink data for being sent to receiving the BBU carry out uplink/downlink antenna correction, will corrected
Downlink data afterwards is sent to the IFFT modules；
The IFFT modules, for carrying out inverse fast fourier transform to the downlink data after correction, and add cyclic prefix, will add
Downlink data after cyclic prefix is sent to the data intermediate frequency module.
9. RRU according to claim 7, it is characterised in that the second processing unit, in addition to：For up direction
Antenna calibration module and FFT module；Wherein,
The FFT module, the upstream data for being sent to receiving the data intermediate frequency module remove cyclic prefix, and carry out fast
Fast Fourier transformation, the upstream data after Fast Fourier Transform (FFT) is sent to the antenna calibration module；
The antenna calibration module, for carrying out uplink antenna correction to the upstream data after Fast Fourier Transform (FFT), it will correct
Upstream data afterwards is sent to the BBU.
10. a kind of antenna correcting method, it is characterised in that methods described includes：
Second processing unit in RRU sends antenna calibration sequence corresponding with each antenna to be corrected to radio frequency unit；
The each antenna calibration sequence received is returned to described by the radio frequency unit by the coupling networking pre-set
Two processing units；
The each antenna to be corrected of each antenna calibration sequence pair that the second processing unit returns according to the radio frequency unit
It is corrected.
11. according to the method for claim 10, it is characterised in that the antenna calibration sequence includes：Up correction sequence
With descending correction sequence.
12. according to the method for claim 11, it is characterised in that the second processing unit returns according to the radio frequency unit
Return each antenna to be corrected of each antenna calibration sequence pair be corrected including：
The second processing unit is according to each up correction sequence that the radio frequency unit returns to each to be corrected up
Antenna carries out uplink antenna correction；
The second processing unit is according to each descending correction sequence that the radio frequency unit returns to each to be corrected descending
Antenna carries out uplink/downlink antenna correction.
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| CN201610442395.XA CN107517503B (en) | 2016-06-17 | 2016-06-17 | Processing device, BBU, RRU and antenna correction method |
| PCT/CN2017/087093 WO2017215467A1 (en) | 2016-06-17 | 2017-06-02 | Processing device, bbu, rru, and antenna correction method |
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| WO2017215467A1 (en) | 2017-12-21 |
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