CN103731884B - A kind of BBU, RRU and its data transmission method and wireless access system - Google Patents
A kind of BBU, RRU and its data transmission method and wireless access system Download PDFInfo
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- CN103731884B CN103731884B CN201210387096.2A CN201210387096A CN103731884B CN 103731884 B CN103731884 B CN 103731884B CN 201210387096 A CN201210387096 A CN 201210387096A CN 103731884 B CN103731884 B CN 103731884B
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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
Abstract
A kind of BBU, RRU and its data transmission method and wireless access system.In some feasible embodiments of the present invention, the part or all of function of its Base-Band Processing is transferred to RRU to carry out by BBU, based on above-mentioned innovation mechanism, the data volume transmitted between BBU and RRU greatly reduces, so as to transmit the data between BBU and RRU with IP network, meanwhile BBU integrated levels improve, the data of more multiple cell can be handled.
Description
Technical field
The present invention relates to field of communication technology, and in particular to a kind of BBU, RRU and its data transmission method and wireless access
System.
Background technology
In 3G and LTE (Long Term Evolution, Long Term Evolution) Radio Access Network, it is common to use be BBU
(Base Band Unit, Base Band Unit) and the separated distributed bases of RRU (Radio Remote Unit, wireless remote unit)
Station rack structure, as shown in Figure 1, wherein BBU is responsible for all L1 (Layer1, layer 1), L2 (Layer2, layer 2), L3 (Layer3, layer 3)
Processing, including high level data transmission, scheduling and base band signal process etc., RRU is substantially carried out the Up/Down Conversion of signal, work(
Put, filter, the conversion of middle radiofrequency signal.BBU generally concentrates cloth and is placed on computer room, and then cloth is placed on distally (close to antenna) RRU, one
BBU can connect multiple RRU, be attached between BBU and RRU using point-to-point optical fiber, standard between BBU and RRU
CPRI (Common Public Radio Interface, common public radio interface) interface carries out the transmission of base band data.
The specific function modules of BBU and RRU are as shown in Figure 2.To be completed in existing technical solution, in BBU L1, L2,
L3 total datas face and the processing of chain of command, are then transferred to RRU by baseband signal by CPRI interfaces again.Between BBU and RRU
All it is the baseband I/Q data directly transmitted, since base band data amount is huge, this requirement to transmission is very high, BBU in existing scheme
Fiber direct connection is used between RRU.
According to existing BBU, the division of RRU function modules, uses the design of fiber optic stretch, BBU and RRU between BBU and RRU
Between the baseband signal transmitted, the advantages of this mode is that RRU deployment is flexible, and isolation is preferable between cell, but each RRU
It is required for drawing an optical fiber between BBU, adds the cost arranged net, data sharing between BBU of base station and mutually passes also very
Inconvenience.
On the other hand since the data volume of baseband signal is huge, with being continuously increased for antenna number and system bandwidth, transmit
The increase also at double of baseband signal data amount, this proposes challenge to traditional BBU+RRU wireless network architectures.With one
20M, exemplified by the LTE cells of 4 antennas, if I/Q data is quantified all in accordance with 16bit, the base band data amount of single channel cell will
Reach 2048*15*16bit*2IQ*4channel=3.9Gbps.
According to existing CPRI agreements, the base band data rate transmitted between BBU and RRU is constant, that is to say, that i.e.
Make the message transmission rate that high speed when the load very little of base station, must be also kept between BBU and RRU, for night telephone traffic
Currently existing scheme obviously also result in the waste of transfer resource at the time of very little.
The content of the invention
The embodiment of the present invention provides a kind of BBU, RRU and its data transmission method and wireless access system, to reduce BBU
The data volume transmitted between RRU.
First aspect present invention provides a kind of data transmission method, applied to wireless access system, the wireless access system
System includes BBU and RRU, the described method includes：Downlink data waiting for transmission processing is each down physical channel number by the BBU
According to, and by each down physical channel data transfer to the RRU；The BBU receives each ascending of the RRU transmission
It is upstream data by each physical uplink channel data processing when managing channel data.
Wherein, each down physical channel data include：DSCH Downlink Shared Channel data, down control channel data and wide
Broadcast channel data；Each physical uplink channel data includes：It is Uplink Shared Channel data, uplink control channel data, random
Access channel data and/or Uplink Shared Channel channel associated signalling.
In the first possible implementation, the BBU believes downlink data waiting for transmission processing for each downlink physical
Track data, and by each down physical channel data transfer to the RRU, including：The BBU is to the downlink waiting for transmission
Data are scheduled processing, generate the DSCH Downlink Shared Channel data and the down control channel data；The BBU is to cell
Public information is handled, and generates the broadcast channel data；The BBU controls the DSCH Downlink Shared Channel data, downlink
Channel data and broadcast channel data are transmitted to the RRU.
The possible implementation of with reference to first aspect the first, in second of possible implementation, the BBU connects
It is upstream data by each physical uplink channel data processing when receiving each physical uplink channel data of the RRU transmission,
Including：The BBU receives the Uplink Shared Channel data, Uplink Shared Channel channel associated signalling, upload control letter of the RRU transmission
Track data and rach data；The Uplink Shared Channel is transmitted to number biography protocol stack and is handled by the BBU；Institute
State BBU and the uplink control channel data is used for algorithmic dispatching；The rach data is used for user by the BBU
Random access procedure.
In the third possible implementation, the BBU believes downlink data waiting for transmission processing for each downlink physical
Track data, and by each down physical channel data transfer to the RRU, including：The BBU is to the downlink waiting for transmission
Data are scheduled processing, generate the DSCH Downlink Shared Channel data and the down control channel data；The BBU is to cell
Public information is handled, and generates the broadcast channel data；The BBU controls the DSCH Downlink Shared Channel data, downlink
Channel data and broadcast channel data carry out Base-Band Processing respectively；The BBU is by the DSCH Downlink Shared Channel after Base-Band Processing
Data, down control channel data and broadcast channel data are transmitted to the RRU；Wherein, the Base-Band Processing include with down toward
A kind of few processing：CRC check, scrambling, modulation, layer mapping precoding.
The third possible implementation with reference to first aspect, in the 4th kind of possible implementation, the BBU connects
It is upstream data by each physical uplink channel data processing when receiving each physical uplink channel data of the RRU transmission,
Including：The BBU receive the Uplink Shared Channel data after the Base-Band Processing of the RRU transmission, uplink control channel data and
Rach data；The BBU to the Uplink Shared Channel data after the Base-Band Processing, uplink control channel data and
Rach data completes do not have the Base-Band Processing carried out in the Base-Band Processing；The BBU is by the completion base band
Uplink Shared Channel after reason is transmitted to number biography protocol stack and is handled；The BBU by it is described completion Base-Band Processing after uplink
Control channel data is used for algorithmic dispatching；The BBU uses the rach data after the completion Base-Band Processing
Family random access procedure.
With reference to first aspect or second of the first possible implementation or first aspect of first aspect possible
4th kind of possible implementation of the possible implementation of the third of implementation or first aspect or first aspect,
In five kinds of possible implementations, the BBU is by IP network by each down physical channel data transfer to the RRU；
Alternatively, the BBU receives each physical uplink channel data of the RRU transmission by IP network.
Second aspect of the present invention provides a kind of data transmission method, applied to wireless access system, the wireless access system
System includes BBU and RRU, it is characterised in that the described method includes：The RRU receives each downlink physical letter of the BBU transmission
It is baseband signal by each down physical channel data processing during track data；The RRU handles upstream data waiting for transmission
For each physical uplink channel data, and each physical uplink channel data is transmitted to the BBU.
Wherein, each down physical channel data include：DSCH Downlink Shared Channel data, down control channel data and wide
Broadcast channel data；Each physical uplink channel data includes：It is Uplink Shared Channel data, uplink control channel data, random
Access channel data and/or Uplink Shared Channel channel associated signalling.
In the first possible implementation, the RRU receives each down physical channel data of the BBU transmission
When, it is base band data by each down physical channel data processing, including：The RRU receives the downlink letter of the BBU transmission
Track data, Downlink Control Information and broadcast channel data；The RRU is by the down channel data, Downlink Control Information and wide
It is base band data to broadcast channel data processing.
With reference to the first possible implementation of second aspect, in second of implementation, the RRU will be to be transmitted
Upstream data processing be each physical uplink channel data, and each physical uplink channel data is transmitted to the BBU, bag
Include：Upstream data waiting for transmission processing is Uplink Shared Channel data, uplink control channel data, random access by the RRU
Channel data and Uplink Shared Channel channel associated signalling；The RRU is by the Uplink Shared Channel data, uplink control channel number
The BBU is transmitted to according to, rach data and Uplink Shared Channel channel associated signalling.
In the third possible implementation, the RRU receives each down physical channel data of the BBU transmission
When, it is base band data by each down physical channel data processing, including：The RRU is received at the base band of the BBU transmission
Down channel data, Downlink Control Information and broadcast channel data after reason；The RRU believes the downlink after the Base-Band Processing
Track data, Downlink Control Information and broadcast channel data processing are base band data；Wherein, the Base-Band Processing include it is following at least
One kind processing：CRC check, scrambling, modulation, layer mapping precoding.
With reference to the third possible implementation of second aspect, in the 4th kind of possible implementation, the RRU will
Upstream data waiting for transmission processing be each physical uplink channel data, and described in each physical uplink channel data is transmitted to
BBU, including：The RRU by upstream data waiting for transmission processing for Uplink Shared Channel data, uplink control channel data, with
Machine access channel data；The RRU is to the Uplink Shared Channel data, uplink control channel data, rach
According to progress Base-Band Processing；The RRU by the Uplink Shared Channel data after Base-Band Processing, uplink control channel data, with
Machine access channel data is transmitted to the BBU；Wherein, the Base-Band Processing includes following at least one processing：Layer mapping prelists
Code, modulation, scrambling, CRC check.
Second with reference to the possible implementation of the first of second aspect or second aspect or second aspect is possible
4th kind of possible implementation of the possible implementation of the third of implementation or second aspect or second aspect,
In five kinds of possible implementations, the RRU receives each down physical channel data of the BBU transmission by IP network；Or
Each physical uplink channel data is transmitted to BBU by person, the RRU by IP network.
Third aspect present invention provides a kind of BBU, and applied to wireless access system, the wireless access system includes BBU
And RRU, it is characterised in that the BBU includes：First processing units, for being each downlink by downlink data waiting for transmission processing
Physical channel data；First transmission unit, for by each down physical channel data transfer to the RRU；First receives
Unit, for receiving each physical uplink channel data of the RRU transmission；Second processing unit, receives single for described first
It is uplink by each physical uplink channel data processing when member receives each physical uplink channel data of the RRU transmission
Data.
Wherein, each down physical channel data include：DSCH Downlink Shared Channel data, down control channel data and wide
Broadcast channel data；Each physical uplink channel data includes：It is Uplink Shared Channel data, uplink control channel data, random
Access channel data and/or Uplink Shared Channel channel associated signalling.
In the first possible implementation, the first processing units include：
First scheduling processing unit, for being scheduled processing to the downlink data waiting for transmission, generates the downlink
Shared channel data and the down control channel data；
First generation unit, for handling cell public information, generates the broadcast channel data；
First transmission unit includes：
Second transmission unit, for first scheduling processing unit is generated the DSCH Downlink Shared Channel data, under
Row control channel data and the broadcast channel data of the first generation unit generation are transmitted to the RRU.
With reference to the first possible implementation of the third aspect, in second of possible implementation, described first
Receiving unit includes：Second receiving unit, for receiving Uplink Shared Channel data, the Uplink Shared Channel of the RRU transmission
Channel associated signalling, uplink control channel data and rach data；The second processing unit includes：3rd processing is single
Member, is handled for the Uplink Shared Channel to be transmitted to number biography protocol stack；Fourth processing unit, for by the uplink
Control channel data is used for algorithmic dispatching；5th processing unit, the random access letter is handled for triggering user's access process
Track data.
In the third possible implementation, the first processing units include：Second scheduling processing unit, for pair
The downlink data waiting for transmission is scheduled processing, generates the DSCH Downlink Shared Channel data and the down control channel number
According to；Second generation unit, for handling cell public information, generates the broadcast channel data；First Base-Band Processing
Unit, for being carried out respectively at base band to the DSCH Downlink Shared Channel data, down control channel data and broadcast channel data
Reason；First transmission unit includes：3rd transmission unit, for by the institute after the first baseband processing unit Base-Band Processing
State DSCH Downlink Shared Channel data, down control channel data and broadcast channel data and be transmitted to the RRU；Wherein, the base band
Processing includes following at least one processing：CRC check, scrambling, modulation, layer mapping precoding.
With reference to the third possible implementation of the third aspect, in the 4th kind of possible implementation, described first
Receiving unit includes：3rd receiving unit, Uplink Shared Channel data after Base-Band Processing for receiving RRU transmission,
Uplink control channel data and rach data；The second processing unit includes：Second baseband processing unit, is used for
Described in being completed to the Uplink Shared Channel data after the Base-Band Processing, uplink control channel data and rach data
There is no the Base-Band Processing carried out in Base-Band Processing；6th processing unit, for second baseband processing unit to be completed base band
Uplink Shared Channel after processing is transmitted to number biography protocol stack and is handled；7th processing unit, for by the completion base band
Uplink control channel data after processing is used for algorithmic dispatching；8th processing unit, for triggering user's access process processing institute
State the rach data after completing Base-Band Processing.
Second with reference to the possible implementation of the first of the third aspect or the third aspect or the third aspect is possible
4th kind of possible implementation of the possible implementation of the third of implementation or the third aspect or the third aspect,
In five kinds of possible implementations, the BBU is by IP network by each down physical channel data transfer to the RRU；
Alternatively, the BBU receives each physical uplink channel data of the RRU transmission by IP network.
Fourth aspect present invention provides a kind of RRU, and applied to wireless access system, the wireless access system includes BBU
And RRU, it is characterised in that the RRU includes：4th receiving unit, for receiving each down physical channel of the BBU transmission
Data；9th processing unit, each down physical channel data of the BBU transmission are received for the 4th receiving unit
When, it is baseband signal by each down physical channel data processing；Tenth processing unit, will be waiting for transmission for the RRU
Upstream data processing is each physical uplink channel data；4th transmission unit, for each physical uplink channel data to be passed
Transport to the BBU.
Wherein, each down physical channel data include：DSCH Downlink Shared Channel data, down control channel data and wide
Broadcast channel data；Each physical uplink channel data includes：It is Uplink Shared Channel data, uplink control channel data, random
Access channel data and/or Uplink Shared Channel channel associated signalling.
In the first possible implementation, the 4th receiving unit includes：5th receiving unit, for receiving
State down channel data, Downlink Control Information and the broadcast channel data of BBU transmission；Tenth processing unit includes：Tenth
One processing unit, for being base band data by the processing of the down channel data, Downlink Control Information and broadcast channel data.
With reference to the first possible implementation of fourth aspect, in second of possible implementation, the described tenth
Processing unit includes：12nd processing unit, for being Uplink Shared Channel data, uplink by upstream data waiting for transmission processing
Control channel data, rach data and Uplink Shared Channel channel associated signalling；4th transmission unit includes：5th
Transmission unit, for Uplink Shared Channel data, uplink control channel data, rach data and the uplink to be total to
Enjoy channel channel associated signalling and be transmitted to the BBU.
In the third possible implementation, the 4th receiving unit includes：6th receiving unit, for receiving
State down channel data, Downlink Control Information and the broadcast channel data after the Base-Band Processing of BBU transmission；9th processing is single
Member includes：13rd processing unit, for by the down channel data after Base-Band Processing, Downlink Control Information and broadcast channel number
It is base band data according to processing；Wherein, the Base-Band Processing includes following at least one processing：CRC check, scrambling, modulation, layer reflect
Penetrate precoding.
With reference to the third possible implementation of fourth aspect, in the 4th kind of possible implementation, the described tenth
Processing unit includes：14th processing unit, for being Uplink Shared Channel data, uplink by upstream data waiting for transmission processing
Control channel data, rach data；3rd baseband processing unit, for the Uplink Shared Channel data,
Row control channel data, rach data carry out Base-Band Processing；4th transmission unit includes：6th transmission is single
Member, for the Uplink Shared Channel data after Base-Band Processing, uplink control channel data, rach data to be passed
Transport to the BBU；Wherein, the Base-Band Processing includes following at least one processing：Layer mapping precoding, modulation, scrambling, CRC
Verification.
Second with reference to the possible implementation of the first of fourth aspect or fourth aspect or fourth aspect is possible
4th kind of possible implementation of the possible implementation of the third of implementation or fourth aspect or fourth aspect,
In five kinds of possible implementations, the RRU receives each down physical channel data of the BBU transmission by IP network；Or
Each physical uplink channel data is transmitted to BBU by person, the RRU by IP network.
Fifth aspect present invention provides a kind of wireless access system, includes the of the claim third aspect or the third aspect
A kind of the third possible reality of second possible implementation or the third aspect of possible implementation or the third aspect
Described in 5th kind of possible implementation of the 4th kind of possible implementation or the third aspect of existing mode or the third aspect
BBU and second of possible realization side of the possible implementation of the first of fourth aspect or fourth aspect or fourth aspect
4th kind of possible implementation or fourth aspect of the possible implementation of the third of formula or fourth aspect or fourth aspect
The 5th kind of possible implementation described in RRU.
Therefore in some feasible embodiments of the present invention, BBU passes through by the part of its Base-Band Processing or entirely
Portion's function transfers to RRU to carry out, and based on above-mentioned innovation mechanism, the data volume transmitted between BBU and RRU greatly reduces, so as to
The data between BBU and RRU are transmitted with IP network, meanwhile, BBU integrated levels improve, and can handle the data of more multiple cell.
Brief description of the drawings
In order to illustrate more clearly about the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing
There is attached drawing needed in technology description to be briefly described, it should be apparent that, drawings in the following description are only this
Some embodiments of invention, for those of ordinary skill in the art, without creative efforts, can be with
Other attached drawings are obtained according to these attached drawings.
Fig. 1 is distribution-type base station architecture figure of the prior art；
Fig. 2 is that BBU divides schematic diagram with RRU function modules in existing LTE wireless access systems；
Fig. 3 is data volume change schematic diagram of the downlink data after each function treatment in LTE wireless access systems；
Fig. 4 is the BBU end data transmission method flow charts of first embodiment of the invention；
Fig. 5 is the RRU end data transmission method flow charts of first embodiment of the invention；
Fig. 6 is the BBU end data transmission method flow charts of second embodiment of the invention；
Fig. 7 is the RRU end data transmission method flow charts of second embodiment of the invention；
Fig. 8 is a kind of LTE wireless access systems Organization Chart of the present invention；
Fig. 9 is that BBU divides schematic diagram with RRU function modules in a kind of LTE wireless access systems of the invention；
Figure 10 is the BBU end data transmission method flow charts of third embodiment of the invention；
Figure 11 is the RRU end data transmission method flow charts of third embodiment of the invention；
Figure 12 is that BBU divides schematic diagram with RRU function modules in another LTE wireless access system of the invention；
Figure 13 is the wireless access system structure diagram of fourth embodiment of the invention；
Figure 14 is the structure diagram of the BBU of fifth embodiment of the invention；
Figure 15 is the structure diagram of the RRU of fifth embodiment of the invention；
Figure 16 is the structure diagram of the BBU of sixth embodiment of the invention；
Figure 17 is the structure diagram of the RRU of sixth embodiment of the invention.
Embodiment
Below in conjunction with the attached drawing in the embodiment of the present invention, the technical solution in the embodiment of the present invention is carried out clear, complete
Site preparation describes, it is clear that described embodiment is only part of the embodiment of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, those of ordinary skill in the art are obtained every other without creative efforts
Embodiment, belongs to the scope of protection of the invention.
The present invention provides a kind of BBU, RRU and its data transmission method and wireless access system, to reduce BBU and RRU
Between volume of transmitted data, save transmission cost.
By taking LTE wireless access systems as an example, refer to Fig. 3, be 4 antenna LTE system in from core net to BBU
Data, after base band, middle radio frequency processing, the change of each step data volume：The IP data packet 300M come from core-network side, warp
Become after crossing Base-Band Processing for 3.8G, data volume adds more than 10 times, and mainly maps the two in modulation and RE during L1 processing
Data increase is obvious in step.
The change of data volume of the present invention according to Fig. 3, RRU processing is distributed to by part or all of Base-Band Processing, from
And the volume of transmitted data between BBU and RRU can be reduced, save transmission cost.
First embodiment of the invention provides a kind of data transmission method, applied to wireless access system, the wireless access
System includes BBU and RRU.
At BBU ends, Fig. 4 is referred to, which includes：
Downlink data waiting for transmission processing is each down physical channel data by step S101, the BBU, and will be described each
Down physical channel data transfer is to the RRU.
Step S102, when the BBU receives each physical uplink channel data of the RRU transmission, by each uplink
Physical channel data processing is upstream data.
Correspondingly, at RRU ends, Fig. 5 is referred to, which includes：
Step S201, when the RRU receives each down physical channel data of the BBU transmission, by each downlink
Physical channel data processing is baseband signal.
Upstream data waiting for transmission processing is each physical uplink channel data by step S202, the RRU, and will be described each
Physical uplink channel data is transmitted to the BBU.
Wherein, each down physical channel data include：DSCH Downlink Shared Channel data, down control channel data and wide
Broadcast channel data；Each physical uplink channel data includes：It is Uplink Shared Channel data, uplink control channel data, random
Access channel data and/or Uplink Shared Channel channel associated signalling.
Connected between BBU and RRU by IP network.
According to a first embodiment of the present invention, the processing of baseband signal is completed at RRU ends, what is transmitted between BBU and RRU is each
Physical channel data, rather than the great base band data of data volume so that the data volume of transmission greatly reduces, so as to use IP
Network transmits the data between BBU and RRU, saves transmission cost.
Second embodiment of the invention provides a kind of data transmission method, applied to wireless access system, the wireless access
System includes BBU and RRU.
At BBU ends, Fig. 6 is referred to, which includes：
Step S301, the BBU are scheduled processing to the downlink data waiting for transmission, generate the downlink and share letter
Track data and the down control channel data.
Step S302, the BBU handle cell public information, generate the broadcast channel data.
Step S303, the BBU are by the DSCH Downlink Shared Channel data, down control channel data and broadcast channel data
It is transmitted to the RRU.
Step S304, the BBU receives the Uplink Shared Channel data of the RRU transmission, Uplink Shared Channel is believed with road
Make, uplink control channel data and rach data.
The Uplink Shared Channel is transmitted to number biography protocol stack and is handled by step S305, the BBU.
The uplink control channel data is used for algorithmic dispatching by step S306, the BBU.
The rach data is used for user's random access procedure by step S307, the BBU.
Correspondingly, at RRU ends, Fig. 7 is referred to, which includes：
Step S401, the RRU receive down channel data, Downlink Control Information and the broadcast channel of the BBU transmission
Data.
The processing of the down channel data, Downlink Control Information and broadcast channel data is base by step S402, the RRU
Band data.
Upstream data waiting for transmission processing is Uplink Shared Channel data, uplink control channel by step S403, the RRU
Data, rach data and Uplink Shared Channel channel associated signalling.
Step S404, the RRU are by the Uplink Shared Channel data, uplink control channel data, random access channel
Data and Uplink Shared Channel channel associated signalling are transmitted to the BBU.
Connected between BBU and RRU by IP network.
According to a second embodiment of the present invention, the processing of baseband signal is completed by RRU completely, what is transmitted between BBU and RRU is
Each physical channel data, rather than the great base band data of data volume so that the data volume of transmission greatly reduces, so as to
IP network transmits the data between BBU and RRU, saves transmission cost.
For ease of more fully understanding technical solution provided in an embodiment of the present invention, below by the reality under a concrete scene
Apply and be introduced exemplified by mode.
In embodiments of the present invention, Fig. 8 is referred to, the function module of BBU, RRU are repartitioned, by whole L1's
Work is put into RRU sides and is handled, and the modulation and RE mappings due to physical layer can cause data volume to increase severely before and after the processing, so will
Whole L1 work, which are put into RRU sides, can greatly reduce the data volume transmitted between BBU, RRU, since transmitted data amount subtracts significantly
It is small, the coffret between BBU, RRU can be thus redefined, current CPRI interfaces can be substituted with IP network to carry out
Data transfer between BBU and RRU, the network element structure of full IPization cause the more flattening of network, the Operation and Maintenance of each network element
Enhanced convenience.
Example below introduces specific L1, L2 separation scheme, its LTE access planar network architectures by taking the LTE system of 4 antennas as an example
As shown in Figure 9.
Specifically Module Division is：
1）One wireless LTE access system is made of BBU and RRU, and wherein BBU passes through wired S1 interfaces and core net phase
Even, the processing with the interface and L2, L3 data surface and chain of command of core net S1 is completed in BBU；
2）CRC check, scrambling, modulation, layer mapping precoding, resource impact, OFDM (Orthogonal are completed in RRU
Frequency Division Multiplexing, Orthogonal Frequency Division Multiplexing) signal generation, I/Q modulation, middle radio frequency processing function；
3）Be connected between BBU and RRU by IP network, transmitted between BBU and RRU data after L2 processing on each channel and
Some managing control informations.Downlink includes：PDSCH (share by Physical Downlink Shared Channel, physical down
Channel) user data, PBCH (physical broadcast channel Physical Broadcast Channel) data, PDCCH (Physical
Downlink Control Channel, Physical Downlink Control Channel) on each user's scheduling information；Uplink includes：PUSCH
(physical uplink shared channel Physical Uplink Shared Channels) user data, channel associated signalling, PUCCH
(physical uplink shared channel Physical Uplink Control Channel) channel data, PRACH (Physical
Random Access Channel Physical Random Access Channels) channel data.
Uplink and downlink flow chart of data processing is：
1）The flow chart of data processing of downlink is：BBU first receives the IP data packets of user by S1 mouthfuls from core-network side, goes
Fall the GTP-U packet header of core-network side, take out payload；Protocol stacks are passed in the number of BBU to be handled, successively plus PDCP protocol headers,
Rlc protocol head, MAC (Media Access Control, medium education) head；After L2 completes the scheduling of each user,
By the PDSCH data of each user（Downlink shared data）The form of table 2 is packaged into, by the PDCCH data of each user（Downlink controls
Channel data）The form of table 3 is packaged into, by PBCH data（Broadcast channel data）The form of table 4 is packaged into, by each downlink physical
The data of channel are sent to RRU by IP network.
RRU sides by network interface receive downlink BBU sides come PDSCH the and PDCCH channel informations of each user and small
Area's PBCH information, therefrom extracts the bit level data of each physical channel, and CRC effects are carried out respectively to the data of each physical channel
Test, channel coding, intertexture, rate-matched, scrambling, modulation, layer mapping precoding.Finally provided further according to the time-frequency of each physical channel
PDSCH, the information of PDCCH, PBCH are assembled into generation OFDM baseband signals after a complete wireless sub-frame by source position.Finally
Baseband signal is changed into radiofrequency signal on antenna from middle radio-frequency module to send.
2）The flow chart of data processing of uplink is：RRU receives the radiofrequency signal that UE uplinks send, the radio frequency in by antenna
Processing is translated into baseband signal, and at the time of due to UE uplink data sendings and position is indicated before being all by base station side,
So base station knows that this moment received is the data of those users and their time-frequency location, by L1 modules in RRU in correspondence
Running time-frequency resource on, solve the symbolic information on the uplink data channels PUSCH of different user；Solve the uplink control of different user
The symbolic information of channel information PUSCH processed, and the information of random access channel PRACH, by each user PUSCH,
PUCCH, PRACH channel symbol information demapping, demodulation, decodes after simultaneously CRC effects are correct and obtains the up channel of each user
Bit level data, by the uplink physical channel bit level data of each user be packaged into table 5,6,7 and 8 definition message format,
Each user uplink physical channel data is sent to by BBU by IP network.
BBU sides have received the PUSCH of different user, PUCCH, PRACH bit-level information, for PUSCH by IP network
It is sent to the protocol stack in L2 by channel data, BBU, removes MAC, RLC (Radio Link Control, media link successively
Control), the protocol header of PDCP (Packet Data Convergence Protocol, Packet Data Convergence Protocol), counted
According to payload, then by the L3 transport modules in BBU add core-network side GTP-U protocol headers, be sent in the form of IP bags
Capable destination host.For PUCCH information, the parameter that BBU therefrom obtains reporting of user is saved in user's context, for instructing
The algorithm of scheduling, triggers user's access process for the information of PRACH, on BBU and is handled.
L2 and the message format that the L1 in RRU specifically communicates and content in BBU is as follows：
Communicated between L2 in BBU and the L1 in RRU in a manner of IP, the data of each channel of uplink and downlink are all packaged in
It is transmitted in IP bags in a manner of TCP, the transformat of message is as shown in table 1：
Table 1
| MAC header | IP heads | TCP header | Message content head | Message content（Each channel data） |
Message content head includes：The length of message, channel type, current frame number, subframe numbers, cell ID and parameter.
For specific message content according to different channels, definition is different, and each channel massage content is made separately below
Description：
2 PDSCH channel datas of table
| Sequence number | IE titles | Explanation |
| 1 | UE id | Different users is distinguished for base station side |
| 2 | UE RNTI | The user RNTI that base station side preserves |
| 3 | TB length | The length of user's TB blocks |
| 4 | PMI indicate | Indicate the pre-coding matrix that the user uses |
| 5 | MIMO Mode | The MIMO mode at family is used in instruction instead |
| 6 | Mod type | The modulation coding scheme of user data is used in instruction instead |
| 7 | RB Alloc Info | Indicate the user's RB dispensing positions, number, the RB methods of salary distribution |
| 8 | MCS | Indicate active user's |
| 9 | TB Payload | The particular content of TB blocks |
3 PDCCH channel datas of table
| Sequence number | IE titles | Explanation |
| 1 | UE id | Different users is distinguished for base station side |
| 2 | UE RNTI | The user RNTI that base station side preserves |
| 3 | Start CCE | The CCE positions of PDCCH startings |
| 4 | CCE Num | The number of CCE |
| 5 | ACK/ACK | HARQ information |
| 6 | DCI Format | DCI format indicates (DCI_1A, DCI_1B ...) |
| 7 | DCI | DCI signaling particular contents |
4 PBCH channel datas of table
| Sequence number | IE titles | Explanation |
| 1 | PBCH info | Transmit PBCH information |
5 PUSCH channel channel associated signallings of table
| Sequence number | IE titles | Explanation |
| 1 | UE id | Different users is distinguished for base station side |
| 2 | UE MAC Instance | The MAC instance numbers of UE |
| 3 | CQI info | UE CQI measurements report, including CQI value, reporting types |
| 4 | UEACK | UE Harq information, including HARQ channel numbers |
6 PUSCH channel datas of table
| Sequence number | IE titles | Explanation |
| 1 | UE id | Different users is distinguished for base station side |
| 2 | UE MAC Instance | The MAC instance numbers of UE |
| 3 | RB alloc Info | The user's uplink RB takes instruction |
| 4 | TB payload | Uplink TB blocks |
7 PUCCH channel datas of table
8 PRACH channel datas of table
| Sequence number | IE titles | Explanation |
| 1 | Preamble Num | The preamble code numbers detected |
| 2 | Preamble List | The access preamble codes detected |
| 3 | Rach Power | Rach receives power |
Using above-described embodiment, following effect can be reached：
1）Greatly reduce the data volume transmitted between BBU and RRU.The 20M LTE of a 4T4R are small in embodiment
Area needs the transmission rate of 3.8Gbps, and L1 processing, which is put into, only needs the transmission rate of 300M or so to meet after RRU；
2）Due to the reduction of transmitted data amount, the data between RRU and BBU can be transmitted with IP network, so full IP
The network of change makes the framework of the whole network more flat, maintainable more preferable；In addition reusable existing IP backbone carries out BBU, RRU
Between data transfer, reduce optical fiber and arrange net cost；
3）It is attached between all BBU and RRU using IP network so that the data exchange between standing is more convenient, can be real
Now more RRU are connected (limitation of original framework light-receiving mouth quantity) with BBU.More preferable BBU integrated levels are, it can be achieved that more joints
Dispatching algorithm, suppresses area interference, lifts estate performance.
Although the embodiment of the present invention is by taking LTE system as an example, but the separated schemes of L1L2 are equally used in UMTS, TD-
Other wireless access systems such as SCDMA.
Third embodiment of the invention provides a kind of data transmission method, applied to wireless access system, the wireless access
System includes BBU and RRU.
At BBU ends, Figure 10 is referred to, which includes：
Step S501, the BBU are scheduled processing to the downlink data waiting for transmission, generate the downlink and share letter
Track data and the down control channel data.
Step S502, the BBU handle cell public information, generate the broadcast channel data.
Step S503, the BBU are to the DSCH Downlink Shared Channel data, down control channel data and broadcast channel data
Base-Band Processing is carried out respectively.
Step S504, the BBU by the DSCH Downlink Shared Channel data after Base-Band Processing, down control channel data and
Broadcast channel data is transmitted to the RRU.
Step S505, the BBU receive the Uplink Shared Channel data after the Base-Band Processing of the RRU transmission, uplink control
Channel data and rach data processed.
Step S506, the BBU to the Uplink Shared Channel data after the Base-Band Processing, uplink control channel data and
Rach data completes do not have the Base-Band Processing carried out in the Base-Band Processing.
Step S507, the BBU by it is described completion Base-Band Processing after Uplink Shared Channel be transmitted to number pass protocol stacks into
Row processing.
Uplink control channel data after the completion Base-Band Processing is used for algorithmic dispatching by step S508, the BBU.
Step S509, the BBU connect the rach data after the completion Base-Band Processing for user at random
Enter flow.
Wherein, the Base-Band Processing includes following at least one processing：CRC check, scrambling, modulation, layer mapping precoding.
At RRU ends, Figure 11 is referred to, which includes：
Step S601, the RRU receive the down channel data after the Base-Band Processing of the BBU transmission, downlink control letter
Breath and broadcast channel data.
Step S602, the RRU are by down channel data, Downlink Control Information and the broadcast channel after the Base-Band Processing
Data processing is base band data.
Upstream data waiting for transmission processing is Uplink Shared Channel data, uplink control channel by step S603, the RRU
Data, rach data.
Step S604, the RRU are to the Uplink Shared Channel data, uplink control channel data, random access channel
Data carry out Base-Band Processing.
Step S605, the RRU by the Uplink Shared Channel data after Base-Band Processing, uplink control channel data,
Rach data is transmitted to the BBU.
Wherein, the Base-Band Processing includes following at least one processing：Layer mapping precoding, modulation, scrambling, CRC check.
Connected between BBU and RRU by IP network.
According to a third embodiment of the present invention, part Base-Band Processing is completed by RRU, what is transmitted between BBU and RRU is each physics
Channel data, rather than the great base band data of data volume so that the data volume of transmission greatly reduces, so as to use IP network
To transmit the data between BBU and RRU, transmission cost is saved.
For ease of more fully understanding technical solution provided in an embodiment of the present invention, below by the reality under a concrete scene
Apply and be introduced exemplified by mode.
Still by taking above-mentioned LTE wireless access systems as an example.From the LTE system of 4 antennas of Fig. 3 from core net to BBU again to
From the point of view of the data volume change of RRU, data volume is gathered after modulation function module to be increased, and is increased again after resource impact function module, because
This, as an optional scheme, the partial function module of L1 in BBU can be put into RRU and handled, so can also reduce one
The transmission of partial data amount.
Figure 12 is referred to, RRU is transferred to for layer is mapped precoding processing, resource impact processing and ofdm signal generation processing
The LTE access rack compositions handled.
The scheme that L1, L2 are partially separated in the present embodiment, interface, which defines, can continue to use the scheme that above-mentioned L1, L2 are kept completely separate
Interface defines, only a small amount of modification：
9 PDSCH channel datas of table
10 PDCCH channel datas of table
| Sequence number | IE titles | Explanation |
| 1 | UE id | Different users is distinguished for base station side |
| 2 | UE RNTI | The user RNTI that base station side preserves |
| 3 | Start CCE | The CCE positions of PDCCH startings |
| 4 | CCE Num | The number of CCE |
| 5 | PDCCH symbol | The modulated symbolic information of PDCCH |
11 PBCH channel datas of table
| Sequence number | IE titles | Explanation |
| 1 | PBCH symbol | Transmit the modulated symbolic information of PBCH |
12 PUSCH channel datas of table
| Sequence number | IE titles | Explanation |
| 1 | UE id | Different users is distinguished for base station side |
| 2 | UE MAC Instance | The MAC instance numbers of UE |
| 3 | RB alloc Info | The user's uplink RB takes instruction |
| 4 | PUSCH symbol | The modulated symbolic information of PUSCH |
13 PUCCH channel datas of table
| Sequence number | IE titles | Explanation |
| 1 | UE id | Different users is distinguished for base station side |
| 2 | PUCCH symbol | The modulated symbolic information of PUCCH |
14 PRACH channel datas of table
| Sequence number | IE titles | Explanation |
| 1 | Preamble Num | The preamble code numbers detected |
| 2 | PRACH symbol | Symbolic information after PRACH Channel Modulations |
It is related to the uplink and downlink flow chart of data processing of L1, L2：
1）The flow chart of data processing of downlink is：BBU first receives the IP data packets of user by S1 mouthfuls from core-network side, goes
Fall the GTP-U packet header of core-network side, take out payload；Protocol stacks are passed in the number of BBU to be handled, successively plus PDCP protocol headers,
Rlc protocol head, MAC (Media Access Control, medium education) head；After L2 completes the scheduling of each user,
The PDSCH data, PDCCH data and PBCH data of each user are carried out to the Base-Band Processing of CRC check, scrambling and modulation, will be with
The PDSCH data of each user after upper Base-Band Processing are packaged into the form of table 9, by each user's after above Base-Band Processing
PDCCH data are packaged into the form of table 10, and the PBCH data after above Base-Band Processing are packaged into the form of table 11, by each downlink
The data of physical channel are sent to RRU by IP network.
RRU sides by network interface receive downlink BBU sides come PDSCH the and PDCCH channel informations of each user and small
Area's PBCH information, therefrom extracts the bit level data of each physical channel, and carrying out layer respectively to the data of each physical channel reflects
Penetrate precoding, the Base-Band Processing of resource impact.Finally further according to each physical channel running time-frequency resource position by PDSCH, PDCCH,
The information of PBCH generates OFDM baseband signals after being assembled into a complete wireless sub-frame.Finally base band is believed by middle radio-frequency module
Number be changed into radiofrequency signal sends on antenna.
2）The flow chart of data processing of uplink is：RRU receives the radiofrequency signal that UE uplinks send, the radio frequency in by antenna
Processing is translated into baseband signal, and at the time of due to UE uplink data sendings and position is indicated before being all by base station side,
So base station knows that this moment received is the data of those users and their time-frequency location, by L1 modules in RRU in correspondence
Running time-frequency resource on, solve the symbolic information on the uplink data channels PUSCH of different user；Solve the uplink control of different user
The symbolic information of channel information PUSCH processed, and the information of random access channel PRACH, by each user PUSCH,
PUCCH, PRACH channel symbol information obtain after carrying out the Base-Band Processing of ofdm signal generation, resource impact, layer mapping precoding
The bit level data of the up channel of each user, by the uplink physical channel bit level data of each user be packaged into table 12,13,
The message format of 14 definition, BBU is sent to by IP network by each user uplink physical channel data.
BBU sides have received the PUSCH of different user, PUCCH, PRACH bit-level information, for PUSCH by IP network
Channel data, completes the Base-Band Processing of modulation, scrambling and CRC check, and then it is sent to protocol stack in L2 by BBU, is gone successively
Fall MAC, RLC (Radio Link Control, media link control), PDCP (Packet Data Convergence
Protocol, Packet Data Convergence Protocol) protocol header, obtain the payload of data, then added by the L3 transport modules in BBU
The GTP-U protocol headers of core-network side, are sent to the destination host of uplink in the form of IP bags.For PUCCH channel datas, complete to adjust
The Base-Band Processing of system, scrambling and CRC check, then BBU therefrom obtain the parameter of reporting of user and be saved in user's context, be used for
The algorithm of scheduling is instructed, for PRACH channel datas, the Base-Band Processing of completion modulation, scrambling and CRC check, BBU triggering users
Access process is handled.
The embodiment of the present invention can also carry out different divisions, and RRU can carry out at least one processing：Ofdm signal
Generation processing, resource impact processing, layer mapping precoding processing, modulation treatment, scrambling processing.But different divisions, causes BBU
The data volume size transmitted between RRU can be different, if data volume is big, it is desired nonetheless to be transmitted by optical fiber.
In the embodiment that L1, L2 are partially separated, before resource impact processing, data between L1, L2 still can be by
Transmitted according to different channels, but the representation of data can differ in each channel, after resource impact processing, own
The data of channel are just combined, and what is at this time transmitted is exactly a series of complex signal.And from 4 antennas of Fig. 3
LTE system in from core net to BBU again to RRU data volume change from the point of view of, after resource impact processing step, data volume increase
The data volume size of base band data transmission between BBU and RRU in the prior art is added to, it is therefore preferred that some implementations of the present invention
In example, resource impact processing and ofdm signal generation processing are all put into RRU ends and carried out.
Although the embodiment of the present invention is by taking LTE system as an example, but the separated scheme of L1, L2 is equally applicable to UMTS, TD-
Other wireless access systems such as SCDMA.
Fourth embodiment of the invention provides a kind of a kind of BBU and RRU, applied to wireless access system, the wireless access
System includes BBU1000 and RRU2000.
Figure 13 is referred to, the BBU1000 in the system includes：
First processing units 1001, for being each down physical channel data by downlink data waiting for transmission processing.
First transmission unit 1002, for by each down physical channel data transfer to the RRU.
First receiving unit 1003, for receiving each physical uplink channel data of the RRU transmission.
Second processing unit 1004, each ascending physical signal letter of the RRU transmission is received for first receiving unit
It is upstream data by each physical uplink channel data processing during track data.
RRU2000 in the system includes：
4th receiving unit 2001, for receiving each down physical channel data of the BBU transmission.
9th processing unit 2002, each downlink physical letter of the BBU transmission is received for the 4th receiving unit
It is baseband signal by each down physical channel data processing during track data.
Tenth processing unit 2003, it is each physical uplink channel to handle upstream data waiting for transmission for the RRU
According to.
4th transmission unit 2004, for each physical uplink channel data to be transmitted to the BBU.
Wherein, each down physical channel data include：DSCH Downlink Shared Channel data, down control channel data and wide
Broadcast channel data；Each physical uplink channel data includes：It is Uplink Shared Channel data, uplink control channel data, random
Access channel data and/or Uplink Shared Channel channel associated signalling.
Data are transmitted by IP network between BBU1000 and RRU2000.
According to a first embodiment of the present invention, the processing of baseband signal is completed at RRU ends, what is transmitted between BBU and RRU is each
Physical channel data, rather than the great base band data of data volume so that the data volume of transmission greatly reduces, so as to use IP
Network transmits the data between BBU and RRU, saves transmission cost.
Fifth embodiment of the invention provides a kind of a kind of BBU and RRU, applied to wireless access system, the wireless access
System includes BBU3000 and RRU4000.
Figure 14 is referred to, in BBU3000, the first processing units 1001 include：
First scheduling processing unit 3001, for being scheduled processing to the downlink data waiting for transmission, described in generation
DSCH Downlink Shared Channel data and the down control channel data；
First generation unit 3002, for handling cell public information, generates the broadcast channel data；
First transmission unit 1002 includes：
Second transmission unit 3003, for the DSCH Downlink Shared Channel number for generating first scheduling processing unit
The RRU is transmitted to according to the broadcast channel data of, down control channel data and the generation of the first generation unit.
First receiving unit 1003 includes：
Second receiving unit 3004, for receive the Uplink Shared Channel data of RRU transmission, Uplink Shared Channel with
Line signaling, uplink control channel data and rach data；
The second processing unit 1004 includes：
3rd processing unit 3005, is handled for the Uplink Shared Channel to be transmitted to number biography protocol stack；
Fourth processing unit 3006, for the uplink control channel data to be used for algorithmic dispatching；
5th processing unit 3007, the rach data is handled for triggering user's access process.
Correspondingly, Figure 15 is referred to, in RRU4000, the 4th receiving unit 2001 includes：
5th receiving unit 4001, for receiving down channel data, Downlink Control Information and the broadcast of the BBU transmission
Channel data；
Tenth processing unit 2002 includes：
11st processing unit 4002, for by down channel data, Downlink Control Information and the broadcast channel data
Handle as base band data.
Tenth processing unit 2003 includes：
12nd processing unit 4003, for being Uplink Shared Channel data, uplink by upstream data waiting for transmission processing
Control channel data, rach data and Uplink Shared Channel channel associated signalling；
4th transmission unit 2004 includes：
5th transmission unit 4004, for by the Uplink Shared Channel data, uplink control channel data, random access
Channel data and Uplink Shared Channel channel associated signalling are transmitted to the BBU.
Data are transmitted by IP network between BBU3000 and RRU4000.
According to a fifth embodiment of the present invention, the processing of baseband signal is completed by RRU completely, what is transmitted between BBU and RRU is
Each physical channel data, rather than the great base band data of data volume so that the data volume of transmission greatly reduces, so as to
IP network transmits the data between BBU and RRU, saves transmission cost.
Sixth embodiment of the invention provides a kind of a kind of BBU and RRU, applied to wireless access system, the wireless access
System includes BBU5000 and RRU6000.
Figure 16 is referred to, in BBU5000, the first processing units 1001 include：
Second scheduling processing unit 5001, for being scheduled processing to the downlink data waiting for transmission, described in generation
DSCH Downlink Shared Channel data and the down control channel data；
Second generation unit 5002, for handling cell public information, generates the broadcast channel data；
First baseband processing unit 5003, for the DSCH Downlink Shared Channel data, down control channel data and wide
Broadcast channel data and carry out Base-Band Processing respectively；
First transmission unit 1002 includes：
3rd transmission unit 5004, for the downlink after the first baseband processing unit Base-Band Processing to be shared letter
Track data, down control channel data and broadcast channel data are transmitted to the RRU；
Wherein, the Base-Band Processing includes following at least one processing：CRC check, scrambling, modulation, layer mapping precoding.
First receiving unit 1003 includes：
3rd receiving unit 5005, Uplink Shared Channel data after Base-Band Processing for receiving RRU transmission,
Row control channel data and rach data；
The second processing unit 1004 includes：
Second baseband processing unit 5006, for Uplink Shared Channel data, the upload control after the Base-Band Processing
Channel data and rach data complete do not have the Base-Band Processing carried out in the Base-Band Processing；
6th processing unit 5007, for the uplink after second baseband processing unit completion Base-Band Processing to be shared letter
Road is transmitted to number biography protocol stack and is handled；
7th processing unit 5008, for the uplink control channel data after the completion Base-Band Processing to be used for algorithm tune
Degree；
8th processing unit 5009, for triggering the random access after user's access process handles the completion Base-Band Processing
Channel data.
Correspondingly, Figure 17 is referred to, in RRU6000, the 4th receiving unit 2001 includes：
6th receiving unit 6001, the down channel data after Base-Band Processing for receiving the BBU transmission, downlink control
Information and broadcast channel data processed；
9th processing unit 2002 includes：
13rd processing unit 6002, for by down channel data, Downlink Control Information and the broadcast after Base-Band Processing
Channel data processing is base band data；
Wherein, the Base-Band Processing includes following at least one processing：CRC check, scrambling, modulation, layer mapping precoding.
Tenth processing unit 2003 includes：
14th processing unit 6003, for being Uplink Shared Channel data, uplink by upstream data waiting for transmission processing
Control channel data, rach data；
3rd baseband processing unit 6004, for Uplink Shared Channel data, uplink control channel data, random
Access channel data carries out Base-Band Processing；
4th transmission unit 2004 includes：
6th transmission unit 6005, for by the Uplink Shared Channel data after Base-Band Processing, uplink control channel
Data, rach data are transmitted to the BBU；
Wherein, the Base-Band Processing includes following at least one processing：Layer mapping precoding, modulation, scrambling, CRC check.
Data are transmitted by IP network between BBU5000 and RRU6000.
According to a sixth embodiment of the present invention, part Base-Band Processing is completed by RRU, what is transmitted between BBU and RRU is each physics
Channel data, rather than the great base band data of data volume so that the data volume of transmission greatly reduces, so as to use IP network
To transmit the data between BBU and RRU, transmission cost is saved.
The present invention also provides a kind of wireless access system, including BBU and RRU described in above example.The wireless access
System is suitable for the Radio Access Networks such as LTE, UMTS, TD-SCDMA.
The above disclosure is only the preferred embodiments of the present invention, cannot limit the right model of the present invention with this certainly
Enclose, therefore equivalent variations made according to the claims of the present invention, it is still within the scope of the present invention.
Claims (13)
1. a kind of data transmission method, applied to wireless access system, the wireless access system includes BBU and RRU, its feature
It is, the described method includes：
The BBU by downlink data waiting for transmission processing be each down physical channel data, and by IP network by it is described it is each under
Row physical channel data is transmitted to the RRU；
When the BBU receives each physical uplink channel data of the RRU transmission by the IP network, by each uplink
Physical channel data processing is upstream data；
Wherein, each down physical channel data include：DSCH Downlink Shared Channel data, down control channel data and broadcast letter
Track data；Each physical uplink channel data includes：Uplink Shared Channel data, uplink control channel data, random access
Channel data and/or Uplink Shared Channel channel associated signalling；
Downlink data waiting for transmission processing is each down physical channel data by the BBU, and by each down physical channel
Data transfer to the RRU, including：
The BBU is scheduled processing to the downlink data waiting for transmission, generates DSCH Downlink Shared Channel data and described
Down control channel data；
The BBU handles cell public information, generates the broadcast channel data；
The DSCH Downlink Shared Channel data, down control channel data and broadcast channel data are transmitted to described by the BBU
RRU；
When the BBU receives each physical uplink channel data of the RRU transmission, at each physical uplink channel data
Manage as upstream data, including：
The BBU receives the Uplink Shared Channel data, Uplink Shared Channel channel associated signalling, upload control letter of the RRU transmission
Track data and rach data；
The Uplink Shared Channel is transmitted to number biography protocol stack and is handled by the BBU；
The uplink control channel data is used for algorithmic dispatching by the BBU；
The rach data is used for user's random access procedure by the BBU.
2. according to the method described in claim 1, it is characterized in that, the BBU is handled downlink data waiting for transmission under being each
Row physical channel data, and by each down physical channel data transfer to the RRU, including：
The BBU is scheduled processing to the downlink data waiting for transmission, generates DSCH Downlink Shared Channel data and described
Down control channel data；
The BBU handles cell public information, generates the broadcast channel data；
The BBU carries out base band respectively to the DSCH Downlink Shared Channel data, down control channel data and broadcast channel data
Processing；
The BBU is by the DSCH Downlink Shared Channel data, down control channel data and the broadcast channel data after Base-Band Processing
It is transmitted to the RRU；
Wherein, the Base-Band Processing includes following at least one processing：CRC check, scrambling, modulation, layer mapping precoding.
3. according to the method described in claim 2, it is characterized in that, the BBU receives each ascending physical signal of the RRU transmission
It is upstream data by each physical uplink channel data processing during channel data, including：
The BBU receive the Uplink Shared Channel data after the Base-Band Processing of the RRU transmission, uplink control channel data and with
Machine access channel data；
The BBU is to Uplink Shared Channel data, uplink control channel data and the random access channel after the Base-Band Processing
Data complete do not have the Base-Band Processing carried out in the Base-Band Processing；
Uplink Shared Channel after the completion Base-Band Processing is transmitted to number biography protocol stack and is handled by the BBU；
Uplink control channel data after the completion Base-Band Processing is used for algorithmic dispatching by the BBU；
Rach data after the completion Base-Band Processing is used for user's random access procedure by the BBU.
4. a kind of data transmission method, applied to wireless access system, the wireless access system includes BBU and RRU, its feature
It is, the described method includes：
When the RRU receives each down physical channel data of the BBU transmission by IP network, by each downlink physical
Channel data processing is baseband signal；
Upstream data waiting for transmission processing is each physical uplink channel data by the RRU, and by the IP network by described in
Each physical uplink channel data is transmitted to the BBU；
When the RRU receives each down physical channel data of the BBU transmission, at each down physical channel data
Manage as base band data, including：
The RRU receives DSCH Downlink Shared Channel data, down control channel data and the broadcast channel data of the BBU transmission；
The processing of the DSCH Downlink Shared Channel data, down control channel data and broadcast channel data is base band number by the RRU
According to；
Upstream data waiting for transmission processing is each physical uplink channel data by the RRU, and by each uplink physical channel
Data transfer to the BBU, including：
Upstream data waiting for transmission processing is Uplink Shared Channel data, uplink control channel data, random access by the RRU
Channel data and Uplink Shared Channel channel associated signalling；
The RRU shares Uplink Shared Channel data, uplink control channel data, rach data and the uplink
Channel channel associated signalling is transmitted to the BBU；
Wherein, each down physical channel data include：DSCH Downlink Shared Channel data, down control channel data and broadcast letter
Track data；Each physical uplink channel data includes：Uplink Shared Channel data, uplink control channel data, random access
Channel data and/or Uplink Shared Channel channel associated signalling.
5. according to the method described in claim 4, it is characterized in that, the RRU receives each downlink physical of the BBU transmission
It is base band data by each down physical channel data processing during channel data, including：
The RRU receives the DSCH Downlink Shared Channel data after the Base-Band Processing of the BBU transmission, down control channel data and wide
Broadcast channel data；
The RRU is by the DSCH Downlink Shared Channel data after the Base-Band Processing, down control channel data and broadcast channel data
Handle as base band data；
Wherein, the Base-Band Processing includes following at least one processing：CRC check, scrambling, modulation, layer mapping precoding.
6. according to the method described in claim 5, it is characterized in that, it is on each that the RRU, which handles upstream data waiting for transmission,
Row physical channel data, and each physical uplink channel data is transmitted to the BBU, including：
Upstream data waiting for transmission processing is Uplink Shared Channel data, uplink control channel data, random access by the RRU
Channel data；
The RRU carries out at base band the Uplink Shared Channel data, uplink control channel data, rach data
Reason；
The RRU is by the Uplink Shared Channel data after Base-Band Processing, uplink control channel data, rach
According to being transmitted to the BBU；
Wherein, the Base-Band Processing includes following at least one processing：Layer mapping precoding, modulation, scrambling, CRC check.
7. a kind of BBU, applied to wireless access system, the wireless access system includes BBU and RRU, it is characterised in that described
BBU includes：
First processing units, for being each down physical channel data by downlink data waiting for transmission processing；
First transmission unit, for by IP network by each down physical channel data transfer to the RRU；
First receiving unit, for receiving each physical uplink channel data of the RRU transmission by IP network；
Second processing unit, when receiving each physical uplink channel data of the RRU transmission for first receiving unit,
It is upstream data by each physical uplink channel data processing；
Wherein, each down physical channel data include：DSCH Downlink Shared Channel data, down control channel data and broadcast letter
Track data；Each physical uplink channel data includes：Uplink Shared Channel data, uplink control channel data, random access
Channel data and/or Uplink Shared Channel channel associated signalling；
The first processing units include：
First scheduling processing unit, for being scheduled processing to the downlink data waiting for transmission, generates the downlink and shares
Channel data and the down control channel data；
First generation unit, for handling cell public information, generates the broadcast channel data；
First transmission unit includes：
Second transmission unit, for first scheduling processing unit is generated the DSCH Downlink Shared Channel data, downlink control
Channel data processed and the broadcast channel data of the first generation unit generation are transmitted to the RRU；
First receiving unit includes：
Second receiving unit, for receive the Uplink Shared Channel data of RRU transmission, Uplink Shared Channel channel associated signalling,
Uplink control channel data and rach data；
The second processing unit includes：
3rd processing unit, is handled for the Uplink Shared Channel to be transmitted to number biography protocol stack；
Fourth processing unit, for the uplink control channel data to be used for algorithmic dispatching；
5th processing unit, the rach data is handled for triggering user's access process.
8. BBU according to claim 7, it is characterised in that the first processing units include：
Second scheduling processing unit, for being scheduled processing to the downlink data waiting for transmission, generates the downlink and shares
Channel data and the down control channel data；
Second generation unit, for handling cell public information, generates the broadcast channel data；
First baseband processing unit, for the DSCH Downlink Shared Channel data, down control channel data and broadcast channel number
According to carrying out Base-Band Processing respectively；
First transmission unit includes：
3rd transmission unit, for by the DSCH Downlink Shared Channel data after the first baseband processing unit Base-Band Processing,
Down control channel data and broadcast channel data are transmitted to the RRU；
Wherein, the Base-Band Processing includes following at least one processing：CRC check, scrambling, modulation, layer mapping precoding.
9. BBU according to claim 8, it is characterised in that first receiving unit includes：
3rd receiving unit, the Uplink Shared Channel data after Base-Band Processing for receiving the RRU transmission, upload control letter
Track data and rach data；
The second processing unit includes：
Second baseband processing unit, for the Uplink Shared Channel data after the Base-Band Processing, uplink control channel data
Complete there is no the Base-Band Processing carried out in the Base-Band Processing with rach data；
6th processing unit, for the Uplink Shared Channel after second baseband processing unit completion Base-Band Processing to be transmitted to
Number passes protocol stack and is handled；
7th processing unit, for the uplink control channel data after the completion Base-Band Processing to be used for algorithmic dispatching；
8th processing unit, for triggering the rach after user's access process handles the completion Base-Band Processing
According to.
10. a kind of RRU, applied to wireless access system, the wireless access system includes BBU and RRU, it is characterised in that institute
Stating RRU includes：
4th receiving unit, for receiving each down physical channel data of the BBU transmission by IP network；
9th processing unit, when receiving each down physical channel data of the BBU transmission for the 4th receiving unit,
It is baseband signal by each down physical channel data processing；
Tenth processing unit, it is each physical uplink channel data to handle upstream data waiting for transmission for the RRU；
4th transmission unit, for each physical uplink channel data to be transmitted to the BBU by the IP network；
4th receiving unit includes：
5th receiving unit, for receiving DSCH Downlink Shared Channel data, down control channel data and the broadcast of the BBU transmission
Channel data；
9th processing unit includes：
11st processing unit, for by the DSCH Downlink Shared Channel data, down control channel data and broadcast channel data
Handle as base band data；
Tenth processing unit includes：
12nd processing unit, for being Uplink Shared Channel data, uplink control channel by upstream data waiting for transmission processing
Data, rach data and Uplink Shared Channel channel associated signalling；
4th transmission unit includes：
5th transmission unit, for by the Uplink Shared Channel data, uplink control channel data, rach data
The BBU is transmitted to Uplink Shared Channel channel associated signalling；
Wherein, each down physical channel data include：DSCH Downlink Shared Channel data, down control channel data and broadcast letter
Track data；Each physical uplink channel data includes：Uplink Shared Channel data, uplink control channel data, random access
Channel data and/or Uplink Shared Channel channel associated signalling.
11. RRU according to claim 10, it is characterised in that the 4th receiving unit includes：
6th receiving unit, the DSCH Downlink Shared Channel data after Base-Band Processing for receiving the BBU transmission, downlink control letter
Track data and broadcast channel data；
9th processing unit includes：
13rd processing unit, for by the DSCH Downlink Shared Channel data after Base-Band Processing, down control channel data and broadcast
Channel data processing is base band data；
Wherein, the Base-Band Processing includes following at least one processing：CRC check, scrambling, modulation, layer mapping precoding.
12. RRU according to claim 11, it is characterised in that the tenth processing unit includes：
14th processing unit, for being Uplink Shared Channel data, uplink control channel by upstream data waiting for transmission processing
Data, rach data；
3rd baseband processing unit, for the Uplink Shared Channel data, uplink control channel data, random access channel
Data carry out Base-Band Processing；
4th transmission unit includes：
6th transmission unit, for by Uplink Shared Channel data after Base-Band Processing, uplink control channel data, random
Access channel data is transmitted to the BBU；
Wherein, the Base-Band Processing includes following at least one processing：Layer mapping precoding, modulation, scrambling, CRC check.
13. a kind of wireless access system, including any one of claim 7-9 any one of them BBU and claim 10-12 institute
The RRU stated.
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| PCT/CN2013/073339 WO2014056306A1 (en) | 2012-10-12 | 2013-03-28 | Bbu, rru and data transmission method and wireless access system therefor |
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| EP3143830A4 (en) * | 2014-05-12 | 2018-01-03 | Intel Corporation | C-ran front-end preprocessing and signaling unit |
| CN106332129B (en) * | 2015-06-30 | 2020-03-31 | 华为技术有限公司 | Configuration method of wireless network function, wireless network node and core network equipment |
| US9876585B2 (en) | 2015-07-03 | 2018-01-23 | Huawei Technologies Co., Ltd. | Method and system for partitioning signal processing chains in a communication network |
| CN106375014B (en) * | 2015-07-22 | 2019-12-03 | 上海中兴软件有限责任公司 | A kind of BBU-RRU time delay setting method and device |
| CN106612136A (en) * | 2015-10-20 | 2017-05-03 | 电信科学技术研究院 | Downlink data transmission method, device and system |
| CN106936480A (en) | 2015-12-28 | 2017-07-07 | 电信科学技术研究院 | A kind of signal processing method and device |
| CN107087306A (en) * | 2016-02-12 | 2017-08-22 | 台扬科技股份有限公司 | The method dispatched for wireless information source |
| WO2017173659A1 (en) * | 2016-04-08 | 2017-10-12 | 华为技术有限公司 | Data communication method and device |
| WO2017193313A1 (en) * | 2016-05-11 | 2017-11-16 | 华为技术有限公司 | Digital unit, radio unit, base station and data transmission method |
| CN106686763B (en) * | 2016-12-01 | 2020-06-09 | 邦讯技术股份有限公司 | LTE base station system and cell merging and splitting method |
| CN106603458B (en) * | 2016-12-13 | 2020-01-31 | 武汉虹信通信技术有限责任公司 | baseband processing method and device |
| CN110663233B (en) * | 2017-06-09 | 2021-06-29 | 华为技术有限公司 | Remote device of base station, base station and random access method |
| WO2018227348A1 (en) * | 2017-06-12 | 2018-12-20 | 华为技术有限公司 | Business execution method and apparatus |
| CN108174444B (en) * | 2018-01-29 | 2020-07-07 | 京信通信系统（中国）有限公司 | Positioning symbol transmission method, device and system based on distributed system |
| CN109041080B (en) * | 2018-06-14 | 2020-10-09 | 烽火通信科技股份有限公司 | Method and system for dynamically switching line rate of CPRI service |
| CN111385025A (en) * | 2018-12-29 | 2020-07-07 | 成都华为技术有限公司 | Communication method, RUU, RHUB and communication system |
| CN112261672B (en) * | 2020-09-08 | 2021-07-06 | 浙江三维利普维网络有限公司 | Uplink data analysis method, electronic device and storage medium |
| CN112822671B (en) * | 2020-12-31 | 2023-06-23 | 联想未来通信科技(重庆)有限公司 | Data transmission method and device |
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