CN103731884A - BBU, RRU, data transmission method and wireless access system - Google Patents

BBU, RRU, data transmission method and wireless access system Download PDF

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CN103731884A
CN103731884A CN201210387096.2A CN201210387096A CN103731884A CN 103731884 A CN103731884 A CN 103731884A CN 201210387096 A CN201210387096 A CN 201210387096A CN 103731884 A CN103731884 A CN 103731884A
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channel data
data
bbu
rru
transmission
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CN103731884B (en
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卿杰
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Huawei Technologies Co Ltd
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Huawei Technologies Co Ltd
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Priority to PCT/CN2013/073339 priority patent/WO2014056306A1/en
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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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Abstract

The invention discloses a BBU, an RRU, a data transmission method and a wireless access system. According to some feasible embodiments of the BBU, the RRU, the data transmission method and the wireless access system, part of or all functions of baseband processing of the BBU are conducted by the RRU, based on a creative mechanism, the size of data transmitted between the BBU and the RRU is greatly reduced, the data between the BBU and the RRU can be transmitted through an IP network, and meanwhile the integration level of the BBU is increased, and data of more cells can be processed.

Description

A kind of BBU, RRU and data transmission method thereof and wireless access system
Technical field
The present invention relates to communication technical field, be specifically related to a kind of BBU, RRU and data transmission method thereof and wireless access system.
Background technology
At 3G and LTE (Long Term Evolution, Long Term Evolution) in Radio Access Network, that generally use is BBU (Base Band Unit, Base Band Unit) with RRU (Radio Remote Unit, wireless remote unit) separated distribution-type base station architecture, as shown in Figure 1, wherein BBU is responsible for all L1 (Layer1, layer 1), L2 (Layer2, layer 2), L3 (Layer3, layer 3) processing, comprises high level data transmission, scheduling and base band signal process etc., and RRU mainly carries out Up/Down Conversion, power amplifier, the filtering of signal, the conversion of middle radiofrequency signal.BBU concentrates cloth to be placed on machine room conventionally, RRU cloth is placed on far-end (near antenna), a BBU can connect a plurality of RRU, between BBU and RRU, adopt point-to-point optical fiber to be connected, the CPRI of standard between BBU and RRU (Common Public Radio Interface, common public radio interface) interface carries out the transmission of base band data.
The concrete functional module of BBU and RRU as shown in Figure 2.In existing technical scheme, in BBU, to complete the processing of L1, L2, L3 total data face and chain of command, and then baseband signal is transferred to RRU by CPRI interface.Between BBU and RRU, be all baseband I/Q data of directly transmitting, because base band data amount is huge, this requirement to transmission is very high, in existing scheme, between BBU and RRU, adopts fiber direct connection.
According to existing BBU, RRU functional module is divided, between BBU and RRU, adopt the design of fiber optic stretch, the baseband signal of transmitting between BBU and RRU, the advantage of this mode is that RRU disposes flexibly, and between community, isolation is better, but between each RRU and BBU, needs to draw an optical fiber, increased the cost of arranging net, the data sharing between BBU of base station and mutually biography are also very inconvenient.
On the other hand because the data volume of baseband signal is huge, along with the continuous increase of antenna number and system bandwidth, the also increase at double of the baseband signal data volume of transmission, this has proposed challenge to traditional BBU+RRU wireless network architecture.With a 20M, 4 antenna LTE communities are example, if IQ data all quantize according to 16bit, the base band data amount of single channel community will reach 2048*15*16bit*2IQ*4channel=3.9Gbps.
According to existing CPRI agreement, the base band data speed of transmitting between BBU and RRU is constant, even if that is to say when load when base station is very little, between BBU and RRU, also must keep message transmission rate at a high speed, for the very little existing scheme of the moment of telephone traffic at night, obviously also cause the waste of transfer resource.
Summary of the invention
The embodiment of the present invention provides a kind of BBU, RRU and data transmission method and wireless access system, to reducing the data volume of transmitting between BBU and RRU.
First aspect present invention provides a kind of data transmission method, be applied to wireless access system, described wireless access system comprises BBU and RRU, described method comprises: described BBU is treated to each down physical channel data by downlink data waiting for transmission, and by described each down physical channel transfer of data to described RRU; When described BBU receives each physical uplink channel data of described RRU transmission, described each physical uplink channel data is treated to upstream data.
Wherein, described each down physical channel data comprise: DSCH Downlink Shared Channel data, down control channel data and broadcast channel data; Described each physical uplink channel data comprises: Uplink Shared Channel data, uplink control channel data, rach data and/or Uplink Shared Channel channel associated signalling.
In the possible implementation of the first, described BBU is treated to each down physical channel data by downlink data waiting for transmission, and by described each down physical channel transfer of data to described RRU, comprise: described BBU carries out dispatch deal to described downlink data waiting for transmission, generate described DSCH Downlink Shared Channel data and described down control channel data; Described BBU processes cell public information, generates described broadcast channel data; Described BBU transfers to described RRU by described DSCH Downlink Shared Channel data, down control channel data and broadcast channel data.
In conjunction with the possible implementation of the first of first aspect, in the possible implementation of the second, when described BBU receives each physical uplink channel data of described RRU transmission, described each physical uplink channel data is treated to upstream data, comprises: described BBU receives Uplink Shared Channel data, Uplink Shared Channel channel associated signalling, uplink control channel data and the rach data of described RRU transmission; Described BBU transfers to number biography protocol stack by described Uplink Shared Channel and processes; Described BBU is used for algorithmic dispatching by described uplink control channel data; Described BBU is used for user's random access procedure by described rach data.
In the third possible implementation, described BBU is treated to each down physical channel data by downlink data waiting for transmission, and by described each down physical channel transfer of data to described RRU, comprise: described BBU carries out dispatch deal to described downlink data waiting for transmission, generate described DSCH Downlink Shared Channel data and described down control channel data; Described BBU processes cell public information, generates described broadcast channel data; Described BBU carries out respectively Base-Band Processing to described DSCH Downlink Shared Channel data, down control channel data and broadcast channel data; Described BBU transfers to described RRU by described DSCH Downlink Shared Channel data, down control channel data and broadcast channel data after Base-Band Processing; Wherein, described Base-Band Processing comprises following at least one processing: CRC check, scrambling, modulation, layer mapping precoding.
The third possible implementation in conjunction with first aspect, in the 4th kind of possible implementation, when described BBU receives each physical uplink channel data of described RRU transmission, described each physical uplink channel data is treated to upstream data, comprises: described BBU receives Uplink Shared Channel data, uplink control channel data and the rach data after the Base-Band Processing of described RRU transmission; Uplink Shared Channel data, uplink control channel data and the rach data of described BBU after to described Base-Band Processing completes the Base-Band Processing of not carrying out in described Base-Band Processing; Described BBU transfers to number biography protocol stack by the described Uplink Shared Channel completing after Base-Band Processing and processes; Described BBU completes uplink control channel data after Base-Band Processing for algorithmic dispatching by described; Described BBU completes rach data after Base-Band Processing for user's random access procedure by described.
In conjunction with the third possible implementation of the possible implementation of the second of the possible implementation of the first of first aspect or first aspect or first aspect or first aspect or the 4th kind of possible implementation of first aspect, in the 5th kind of possible implementation, described BBU by IP network by described each down physical channel transfer of data to described RRU; Or described BBU receives each physical uplink channel data of described RRU transmission by IP network.
Second aspect present invention provides a kind of data transmission method, be applied to wireless access system, described wireless access system comprises BBU and RRU, it is characterized in that, described method comprises: when described RRU receives each down physical channel data of described BBU transmission, by described each down physical channel data processing, be baseband signal; Described RRU is treated to each physical uplink channel data by upstream data waiting for transmission, and described each physical uplink channel data is transferred to described BBU.
Wherein, described each down physical channel data comprise: DSCH Downlink Shared Channel data, down control channel data and broadcast channel data; Described each physical uplink channel data comprises: Uplink Shared Channel data, uplink control channel data, rach data and/or Uplink Shared Channel channel associated signalling.
In the possible implementation of the first, when described RRU receives each down physical channel data of described BBU transmission, by described each down physical channel data processing, be base band data, comprise: described RRU receives down channel data, Downlink Control Information and the broadcast channel data of described BBU transmission; Described RRU is treated to base band data by described down channel data, Downlink Control Information and broadcast channel data.
In conjunction with the possible implementation of the first of second aspect, in the second implementation, described RRU is treated to each physical uplink channel data by upstream data waiting for transmission, and described each physical uplink channel data is transferred to described BBU, comprising: described RRU is treated to Uplink Shared Channel data, uplink control channel data, rach data and Uplink Shared Channel channel associated signalling by upstream data waiting for transmission; Described RRU transfers to described BBU by described Uplink Shared Channel data, uplink control channel data, rach data and Uplink Shared Channel channel associated signalling.
In the third possible implementation, when described RRU receives each down physical channel data of described BBU transmission, by described each down physical channel data processing, be base band data, comprise: described RRU receives down channel data, Downlink Control Information and the broadcast channel data after the Base-Band Processing of described BBU transmission; Described RRU is treated to base band data by down channel data, Downlink Control Information and broadcast channel data after described Base-Band Processing; Wherein, described Base-Band Processing comprises following at least one processing: CRC check, scrambling, modulation, layer mapping precoding.
The third possible implementation in conjunction with second aspect, in the 4th kind of possible implementation, described RRU is treated to each physical uplink channel data by upstream data waiting for transmission, and described each physical uplink channel data is transferred to described BBU, comprising: described RRU is treated to Uplink Shared Channel data, uplink control channel data, rach data by upstream data waiting for transmission; Described RRU carries out Base-Band Processing to described Uplink Shared Channel data, uplink control channel data, rach data; Described RRU transfers to described BBU by described Uplink Shared Channel data, uplink control channel data, rach data after Base-Band Processing; Wherein, described Base-Band Processing comprises following at least one processing: layer mapping precoding, modulation, scrambling, CRC check.
In conjunction with the third possible implementation of the possible implementation of the second of the possible implementation of the first of second aspect or second aspect or second aspect or second aspect or the 4th kind of possible implementation of second aspect, in the 5th kind of possible implementation, described RRU receives each down physical channel data of described BBU transmission by IP network; Or described RRU transfers to BBU by IP network by described each physical uplink channel data.
Third aspect present invention provides a kind of BBU, is applied to wireless access system, and described wireless access system comprises BBU and RRU, it is characterized in that, described BBU comprises: the first processing unit, for downlink data waiting for transmission being treated to each down physical channel data; The first transmission unit, for by described each down physical channel transfer of data to described RRU; The first receiving element, for receiving each physical uplink channel data of described RRU transmission; The second processing unit, while receiving each physical uplink channel data of described RRU transmission for described the first receiving element, is treated to upstream data by described each physical uplink channel data.
Wherein, described each down physical channel data comprise: DSCH Downlink Shared Channel data, down control channel data and broadcast channel data; Described each physical uplink channel data comprises: Uplink Shared Channel data, uplink control channel data, rach data and/or Uplink Shared Channel channel associated signalling.
In the possible implementation of the first, described the first processing unit comprises:
The first scheduling processing unit, for described downlink data waiting for transmission is carried out to dispatch deal, generates described DSCH Downlink Shared Channel data and described down control channel data;
The first generation unit, for cell public information is processed, generates described broadcast channel data;
Described the first transmission unit comprises:
The second transmission unit, the broadcast channel data generating for described DSCH Downlink Shared Channel data, down control channel data and the first generation unit that described the first scheduling processing unit is generated transfers to described RRU.
In conjunction with the possible implementation of the first of the third aspect, in the possible implementation of the second, described the first receiving element comprises: the second receiving element, for receiving Uplink Shared Channel data, Uplink Shared Channel channel associated signalling, uplink control channel data and the rach data of described RRU transmission; Described the second processing unit comprises: the 3rd processing unit, for described Uplink Shared Channel being transferred to number biography protocol stack, process; Fourth processing unit, for being used for algorithmic dispatching by described uplink control channel data; The 5th processing unit, processes described rach data for triggering user's access process.
In the third possible implementation, described the first processing unit comprises: the second scheduling processing unit, for described downlink data waiting for transmission is carried out to dispatch deal, generates described DSCH Downlink Shared Channel data and described down control channel data; The second generation unit, for cell public information is processed, generates described broadcast channel data; The first baseband processing unit, for carrying out respectively Base-Band Processing to described DSCH Downlink Shared Channel data, down control channel data and broadcast channel data; Described the first transmission unit comprises: the 3rd transmission unit, for described DSCH Downlink Shared Channel data, down control channel data and broadcast channel data after described the first baseband processing unit Base-Band Processing are transferred to described RRU; Wherein, described Base-Band Processing comprises following at least one processing: CRC check, scrambling, modulation, layer mapping precoding.
The third possible implementation in conjunction with the third aspect, in the 4th kind of possible implementation, described the first receiving element comprises: the 3rd receiving element, for receiving Uplink Shared Channel data, uplink control channel data and the rach data after the Base-Band Processing of described RRU transmission; Described the second processing unit comprises: the second baseband processing unit, completes for Uplink Shared Channel data, uplink control channel data and rach data to after described Base-Band Processing the Base-Band Processing that described Base-Band Processing is not carried out; The 6th processing unit, transfers to number and passes protocol stacks and process for described the second baseband processing unit being completed to Uplink Shared Channel after Base-Band Processing; The 7th processing unit, for completing uplink control channel data after Base-Band Processing for algorithmic dispatching by described; The 8th processing unit, completes the rach data after Base-Band Processing for triggering user's access process described in processing.
In conjunction with the third possible implementation of the possible implementation of the second of the possible implementation of the first of the third aspect or the third aspect or the third aspect or the third aspect or the 4th kind of possible implementation of the third aspect, in the 5th kind of possible implementation, described BBU by IP network by described each down physical channel transfer of data to described RRU; Or described BBU receives each physical uplink channel data of described RRU transmission by IP network.
Fourth aspect present invention provides a kind of RRU, is applied to wireless access system, and described wireless access system comprises BBU and RRU, it is characterized in that, described RRU comprises: the 4th receiving element, for receiving each down physical channel data of described BBU transmission; The 9th processing unit, while receiving each down physical channel data of described BBU transmission for described the 4th receiving element, is baseband signal by described each down physical channel data processing; The tenth processing unit, is treated to each physical uplink channel data for described RRU by upstream data waiting for transmission; The 4th transmission unit, for transferring to described BBU by described each physical uplink channel data.
Wherein, described each down physical channel data comprise: DSCH Downlink Shared Channel data, down control channel data and broadcast channel data; Described each physical uplink channel data comprises: Uplink Shared Channel data, uplink control channel data, rach data and/or Uplink Shared Channel channel associated signalling.
In the possible implementation of the first, described the 4th receiving element comprises: the 5th receiving element, for receiving down channel data, Downlink Control Information and the broadcast channel data of described BBU transmission; Described the tenth processing unit comprises: the 11 processing unit, and for described down channel data, Downlink Control Information and broadcast channel data are treated to base band data.
In conjunction with the possible implementation of the first of fourth aspect, in the possible implementation of the second, described the tenth processing unit comprises: the 12 processing unit, for upstream data waiting for transmission being treated to Uplink Shared Channel data, uplink control channel data, rach data and Uplink Shared Channel channel associated signalling; Described the 4th transmission unit comprises: the 5th transmission unit, and for described Uplink Shared Channel data, uplink control channel data, rach data and Uplink Shared Channel channel associated signalling are transferred to described BBU.
In the third possible implementation, described the 4th receiving element comprises: the 6th receiving element, for receiving down channel data, Downlink Control Information and the broadcast channel data after the Base-Band Processing of described BBU transmission; Described the 9th processing unit comprises: the 13 processing unit, for down channel data, Downlink Control Information and broadcast channel data after Base-Band Processing are treated to base band data; Wherein, described Base-Band Processing comprises following at least one processing: CRC check, scrambling, modulation, layer mapping precoding.
The third possible implementation in conjunction with fourth aspect, in the 4th kind of possible implementation, described the tenth processing unit comprises: the 14 processing unit, for upstream data waiting for transmission is treated to Uplink Shared Channel data, uplink control channel data, rach data; The 3rd baseband processing unit, for carrying out Base-Band Processing to described Uplink Shared Channel data, uplink control channel data, rach data; Described the 4th transmission unit comprises: the 6th transmission unit, for described Uplink Shared Channel data, uplink control channel data, rach data after Base-Band Processing are transferred to described BBU; Wherein, described Base-Band Processing comprises following at least one processing: layer mapping precoding, modulation, scrambling, CRC check.
In conjunction with the third possible implementation of the possible implementation of the second of the possible implementation of the first of fourth aspect or fourth aspect or fourth aspect or fourth aspect or the 4th kind of possible implementation of fourth aspect, in the 5th kind of possible implementation, described RRU receives each down physical channel data of described BBU transmission by IP network; Or described RRU transfers to BBU by IP network by described each physical uplink channel data.
Fifth aspect present invention provides a kind of wireless access system, comprise the RRU described in the 4th kind of possible implementation of the third possible implementation of implementation that the second of implementation that the first of the BBU described in the 4th kind of possible implementation of the third possible implementation of implementation that the second of implementation that the first of the claim third aspect or the third aspect is possible or the third aspect is possible or the third aspect or the third aspect or the 5th kind of possible implementation of the third aspect and fourth aspect or fourth aspect is possible or fourth aspect is possible or fourth aspect or fourth aspect or the 5th kind of possible implementation of fourth aspect.
Therefore, in feasible execution modes more of the present invention, BBU is by transferring to RRU to carry out the part or all of function of its Base-Band Processing, based on above-mentioned innovation mechanism, the data volume of transmitting between BBU and RRU greatly reduces, thereby can transmit the data between BBU and RRU by IP network, simultaneously, BBU integrated level improves, and can process the data of Geng Duo community.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, to the accompanying drawing of required use in embodiment or description of the Prior Art be briefly described below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skills, do not paying under the prerequisite of creative work, can also obtain according to these accompanying drawings other accompanying drawing.
Fig. 1 is distribution-type base station architecture figure of the prior art;
Fig. 2 is BBU and RRU functional module division schematic diagram in existing LTE wireless access system;
Fig. 3 is that in LTE wireless access system, the data volume of downlink data after each function treatment changes schematic diagram;
Fig. 4 is the BBU end data transmission method flow chart of first embodiment of the invention;
Fig. 5 is the RRU end data transmission method flow chart of first embodiment of the invention;
Fig. 6 is the BBU end data transmission method flow chart of second embodiment of the invention;
Fig. 7 is the RRU end data transmission method flow chart of second embodiment of the invention;
Fig. 8 is a kind of LTE wireless access system Organization Chart of the present invention;
Fig. 9 is BBU and RRU functional module division schematic diagram in a kind of LTE wireless access system of the present invention;
Figure 10 is the BBU end data transmission method flow chart of third embodiment of the invention;
Figure 11 is the RRU end data transmission method flow chart of third embodiment of the invention;
Figure 12 is BBU and RRU functional module division schematic diagram in another LTE wireless access system of the present invention;
Figure 13 is the wireless access system structural representation of fourth embodiment of the invention;
Figure 14 is the structural representation of the BBU of fifth embodiment of the invention;
Figure 15 is the structural representation of the RRU of fifth embodiment of the invention;
Figure 16 is the structural representation of the BBU of sixth embodiment of the invention;
Figure 17 is the structural representation of the RRU of sixth embodiment of the invention.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is clearly and completely described, obviously, described embodiment is only the present invention's part embodiment, rather than whole embodiment.Embodiment based in the present invention, those of ordinary skills, not making the every other embodiment obtaining under creative work prerequisite, belong to the scope of protection of the invention.
The invention provides a kind of BBU, RRU and data transmission method thereof and wireless access system, to reducing the volume of transmitted data between BBU and RRU, save transmission cost.
Take LTE wireless access system as example, refer to Fig. 3, be the data from core net to BBU in the LTE system of 4 antennas, after base band, middle radio frequency processing, the variation of each step data volume: the IP packet 300M coming from core-network side, after Base-Band Processing, become 3.8G, data volume has increased more than 10 times, and that L1 mainly shines upon in these two steps data increase at modulation and RE while processing is obvious.
The present invention, according to the variation of the data volume shown in Fig. 3, distributes to RRU by part or all of Base-Band Processing and processes, thereby can reduce the volume of transmitted data between BBU and RRU, saves transmission cost.
First embodiment of the invention provides a kind of data transmission method, is applied to wireless access system, and described wireless access system comprises BBU and RRU.
At BBU end, refer to Fig. 4, this data transmission method comprises:
Step S101, described BBU is treated to each down physical channel data by downlink data waiting for transmission, and by described each down physical channel transfer of data to described RRU.
Step S102, when described BBU receives each physical uplink channel data of described RRU transmission, is treated to upstream data by described each physical uplink channel data.
Correspondingly, at RRU end, refer to Fig. 5, this data transmission method comprises:
Step S201, when described RRU receives each down physical channel data of described BBU transmission, is baseband signal by described each down physical channel data processing.
Step S202, described RRU is treated to each physical uplink channel data by upstream data waiting for transmission, and described each physical uplink channel data is transferred to described BBU.
Wherein, described each down physical channel data comprise: DSCH Downlink Shared Channel data, down control channel data and broadcast channel data; Described each physical uplink channel data comprises: Uplink Shared Channel data, uplink control channel data, rach data and/or Uplink Shared Channel channel associated signalling.
Between BBU and RRU, by IP network, be connected.
According to first embodiment of the invention, at RRU, held the processing of baseband signal, what between BBU and RRU, transmit is each physical channel data, rather than the great base band data of data volume, the data volume of transmission is greatly reduced, thereby can transmit the data between BBU and RRU by IP network, save transmission cost.
Second embodiment of the invention provides a kind of data transmission method, is applied to wireless access system, and described wireless access system comprises BBU and RRU.
At BBU end, refer to Fig. 6, this data transmission method comprises:
Step S301, described BBU carries out dispatch deal to described downlink data waiting for transmission, generates described DSCH Downlink Shared Channel data and described down control channel data.
Step S302, described BBU processes cell public information, generates described broadcast channel data.
Step S303, described BBU transfers to described RRU by described DSCH Downlink Shared Channel data, down control channel data and broadcast channel data.
Step S304, described BBU receives Uplink Shared Channel data, Uplink Shared Channel channel associated signalling, uplink control channel data and the rach data of described RRU transmission.
Step S305, described BBU transfers to number biography protocol stack by described Uplink Shared Channel and processes.
Step S306, described BBU is used for algorithmic dispatching by described uplink control channel data.
Step S307, described BBU is used for user's random access procedure by described rach data.
Correspondingly, at RRU end, refer to Fig. 7, this data transmission method comprises:
Step S401, described RRU receives down channel data, Downlink Control Information and the broadcast channel data of described BBU transmission.
Step S402, described RRU is treated to base band data by described down channel data, Downlink Control Information and broadcast channel data.
Step S403, described RRU is treated to Uplink Shared Channel data, uplink control channel data, rach data and Uplink Shared Channel channel associated signalling by upstream data waiting for transmission.
Step S404, described RRU transfers to described BBU by described Uplink Shared Channel data, uplink control channel data, rach data and Uplink Shared Channel channel associated signalling.
Between BBU and RRU, by IP network, be connected.
According to second embodiment of the invention, by RRU, completed the processing of baseband signal completely, what between BBU and RRU, transmit is each physical channel data, rather than the great base band data of data volume, the data volume of transmission is greatly reduced, thereby can transmit the data between BBU and RRU by IP network, save transmission cost.
The technical scheme providing for ease of understanding better the embodiment of the present invention is that example is introduced below by the execution mode under a concrete scene.
In embodiments of the present invention, refer to Fig. 8, to BBU, the functional module of RRU is repartitioned, the work of whole L1 is put into RRU side to be processed, because the modulation of physical layer and RE mapping can cause data volume to increase severely before and after processing, so being put into RRU side, whole L1 work can greatly reduce BBU, the data volume of transmitting between RRU, because transmitted data amount reduces greatly, so just can redefine BBU, coffret between RRU, can substitute current CPRI interface by IP network and carry out the transfer of data between BBU and RRU, the network element structure of all-IP makes the flattening more of network, the Operation and Maintenance of each network element is more convenient.
To take the LTE system of 4 antennas be the concrete L1 of example introduction, L2 separation scheme to embodiment below, and its LTE Access Network framework as shown in Figure 9.
Concrete Module Division is:
1) a wireless LTE connecting system consists of BBU and RRU, and wherein BBU is connected with core net by wired S1 interface, completes the processing with interface and L2, L3 data surface and the chain of command of core net S1 in BBU;
2) in RRU, complete CRC check, scrambling, modulation, layer mapping precoding, resource mapping, the generation of OFDM (Orthogonal Frequency Division Multiplexing, OFDM) signal, I/Q modulation, middle radio frequency processing function;
3) between BBU and RRU, by IP network, be connected, data and some managing control informations after transmitting L2 between BBU and RRU and processing on each channel.Descending comprising: PDSCH (Physical Downlink Shared Channel, Physical Downlink Shared Channel) user data, PBCH (physical broadcast channel Physical Broadcast Channel) data, upper each user's schedule information of PDCCH (Physical Downlink Control Channel, Physical Downlink Control Channel); Up comprising: PUSCH (physical uplink shared channel Physical Uplink Shared Channel) user data, channel associated signalling, PUCCH (physical uplink shared channel Physical Uplink Control Channel) channel data, PRACH (Physical Random Access Channel Physical Random Access Channel) channel data.
Up-downgoing flow chart of data processing is:
1) descending flow chart of data processing is: first BBU receives user's IP packet from core-network side by S1 mouth, removes the GTP-U packet header of core-network side, takes out payload; Number biography protocol stack at BBU is processed, and adds successively PDCP protocol header, rlc protocol head, MAC (Media Access Control, media access control) head; After L2 has completed each user's scheduling, each user's PDSCH data (descending shared data) are packaged into the form of table 2, each user's PDCCH data (down control channel data) are packaged into the form of table 3, the form that PBCH data (broadcast channel data) is packaged into table 4, sends to RRU by the data of each down physical channel by IP network.
RRU side is received each user's that descending BBU side is come PDSCH and PDCCH channel information and community PBCH information by network interface, therefrom extract the bit-level data of each physical channel, to the data of each physical channel carry out respectively CRC effect, chnnel coding, interweave, rate-matched, scrambling, modulation, layer mapping precoding.Last again according to the running time-frequency resource position of each physical channel by PDSCH, PDCCH, the information of PBCH generates OFDM baseband signal after being assembled into a complete wireless sub-frame.Finally from middle radio-frequency module, baseband signal is become to radiofrequency signal sends on antenna.
2) up flow chart of data processing is: RRU receives the up radiofrequency signal of sending of UE by antenna, in process, radio frequency processing is translated into baseband signal, because the moment and the position of UE uplink data sending are all indicated by base station side before, so base station knows that what receive is those users' data and their time-frequency position this moment, in RRU, L1 module is on corresponding running time-frequency resource, solves the symbolic information on the uplink data channels PUSCH of different user; Solve the symbolic information of the ascending control channel information PUSCH of different user, and the information of Random Access Channel PRACH, process is to each user PUSCH, PUCCH, PRACH channel symbol information demapping, demodulation, obtains the bit-level data of each user's up channel after decoding CRC effect are correct, the message format that each user's uplink physical channel bit-level data encapsulation is become to table 5,6,7 and 8 definition, sends to BBU by IP network by each user uplink physical channel data.
BBU side has been received the PUSCH of different user by IP network, PUCCH, PRACH bit-level information, for PUSCH channel data, BBU is sent to the protocol stack at L2 by it, remove successively MAC, RLC (Radio Link Control, media link control), PDCP (Packet Data Convergence Protocol, PDCP) protocol header, obtain the payload of data, then the L3 transport module in BBU adds the GTP-U protocol header of core-network side, and the form of wrapping with IP mails to up destination host.For PUCCH information, the parameter that BBU therefrom obtains reporting of user is saved in user's context, and for instructing the algorithm of scheduling, for the information of PRACH, the upper triggering of BBU user access process is processed.
The message format that L2 in BBU specifically communicate by letter with L1 in RRU and theing contents are as follows:
Mode with IP between L2 in BBU and the L1 in RRU communicates, and the data of each channel of up-downgoing are all packaged in IP bag to be transmitted in TCP mode, and the transformat of message is as shown in table 1:
Table 1
MAC head IP head TCP head Message content head Message content (each channel data)
Message content head comprises: the length of message, channel type, current frame number, subframe numbers, community ID and parameter.
Concrete message content is according to different channels, defines differently, respectively each channel massage content described below:
Table 2 PDSCH channel data
Sequence number IE title Explanation
1 UE id For base station side, distinguish different users
2 UE RNTI The user RNTI that base station side is preserved
3 TB length The length of user TB piece
4 PMI indicate The pre-coding matrix of indicating this user to use
5 MIMO Mode The MIMO pattern at family is used in indication instead
6 Mod type The modulation coding mode of user data is used in indication instead
7 RB Alloc Info Indicate this user RB distribution locations, number, the RB method of salary distribution
8 MCS Indication active user's
9 TB Payload The particular content of TB piece
Table 3 PDCCH channel data
Sequence number IE title Explanation
1 UE id For base station side, distinguish different users
2 UE RNTI The user RNTI that base station side is preserved
3 Start CCE The CCE position that this PDCCH is initial
4 CCE Num The number of CCE
5 ACK/ACK HARQ information
6 DCI Format The indication of DCI form (DCI_1A, DCI_1B ...)
7 DCI DCI signaling particular content
Table 4 PBCH channel data
Sequence number IE title Explanation
1 PBCH info Transmit PBCH information
Table 5 PUSCH channel channel associated signalling
Sequence number IE title Explanation
1 UE id For base station side, distinguish different users
2 UE MAC Instance The MAC instance number of UE
3 CQI info UE CQI measurement reports, and comprises CQI value, reporting types
4 UEACK UE Harq information, comprises HARQ channel number
Table 6 PUSCH channel data
Sequence number IE title Explanation
1 UE id For base station side, distinguish different users
2 UE MAC Instance The MAC instance number of UE
3 RB alloc Info This user uplink RB takies indication
4 TB payload Up TB piece
Table 7 PUCCH channel data
Figure BDA00002250671500141
Table 8 PRACH channel data
Sequence number IE title Explanation
1 Preamble Num The preamble code number detecting
2 Preamble List The access preamble code detecting
3 Rach Power Rach received power
Utilize above-described embodiment, can reach following effect:
1) greatly reduced the data volume transmitted between BBU and RRU.4T4R 20M LTE community needs the transmission rate of 3.8Gbps in an embodiment, and L1 is processed after being put into RRU and only needs the transmission rate of 300M left and right just can meet;
2) due to the reducing of transmitted data amount, can transmit the data between RRU and BBU by IP network, the network of all-IP makes the framework of the whole network more flat like this, maintainable better; Reusable existing IP backbone carries out BBU in addition, and the transfer of data between RRU reduces the optical fiber cost of arranging net;
3) between all BBU and RRU, adopt IP network to be connected, make the exchanges data between station convenient, can realize more RRU be connected with BBU (original framework light-receiving mouth is counted quantitative limitation).Better BBU integrated level, can realize more combined dispatching algorithm, suppresses area interference, promotes estate performance.
Although the embodiment of the present invention is to take LTE system as example, the scheme of L1L2 separation is used in UMTS equally, other wireless access systems such as TD-SCDMA.
Third embodiment of the invention provides a kind of data transmission method, is applied to wireless access system, and described wireless access system comprises BBU and RRU.
At BBU end, refer to Figure 10, this data transmission method comprises:
Step S501, described BBU carries out dispatch deal to described downlink data waiting for transmission, generates described DSCH Downlink Shared Channel data and described down control channel data.
Step S502, described BBU processes cell public information, generates described broadcast channel data.
Step S503, described BBU carries out respectively Base-Band Processing to described DSCH Downlink Shared Channel data, down control channel data and broadcast channel data.
Step S504, described BBU transfers to described RRU by described DSCH Downlink Shared Channel data, down control channel data and broadcast channel data after Base-Band Processing.
Step S505, described BBU receives Uplink Shared Channel data, uplink control channel data and the rach data after the Base-Band Processing of described RRU transmission.
Step S506, Uplink Shared Channel data, uplink control channel data and the rach data of described BBU after to described Base-Band Processing completes the Base-Band Processing of not carrying out in described Base-Band Processing.
Step S507, described BBU transfers to number biography protocol stack by the described Uplink Shared Channel completing after Base-Band Processing and processes.
Step S508, described BBU completes uplink control channel data after Base-Band Processing for algorithmic dispatching by described.
Step S509, described BBU completes rach data after Base-Band Processing for user's random access procedure by described.
Wherein, described Base-Band Processing comprises following at least one processing: CRC check, scrambling, modulation, layer mapping precoding.
At RRU end, refer to Figure 11, this data transmission method comprises:
Step S601, described RRU receives down channel data, Downlink Control Information and the broadcast channel data after the Base-Band Processing of described BBU transmission.
Step S602, described RRU is treated to base band data by down channel data, Downlink Control Information and broadcast channel data after described Base-Band Processing.
Step S603, described RRU is treated to Uplink Shared Channel data, uplink control channel data, rach data by upstream data waiting for transmission.
Step S604, described RRU carries out Base-Band Processing to described Uplink Shared Channel data, uplink control channel data, rach data.
Step S605, described RRU transfers to described BBU by described Uplink Shared Channel data, uplink control channel data, rach data after Base-Band Processing.
Wherein, described Base-Band Processing comprises following at least one processing: layer mapping precoding, modulation, scrambling, CRC check.
Between BBU and RRU, by IP network, be connected.
According to third embodiment of the invention, by RRU, complete part Base-Band Processing, what between BBU and RRU, transmit is each physical channel data, rather than the great base band data of data volume, the data volume of transmission is greatly reduced, thereby can transmit the data between BBU and RRU by IP network, save transmission cost.
The technical scheme providing for ease of understanding better the embodiment of the present invention is that example is introduced below by the execution mode under a concrete scene.
The above-mentioned LTE wireless access system of still take is example.From the LTE system of 4 antennas of Fig. 3, from core net to BBU, the data volume to RRU changes again, data volume is poly-increasing after modulation function module, after resource mapping functional module, increase again, therefore, as an optional scheme, the partial function module of L1 in BBU can be put in RRU and process, so also can reduce the transmission of a part of data volume.
Referring to Figure 12, is the LTE Access Network Organization Chart that layer is shone upon to precoding processing, resource mapping is processed and ofdm signal generation processing transfers to RRU to process.
The separated scheme of L1, L2 part in the present embodiment, interface definition can be continued to use above-mentioned L1, the L2 interface definition of separated scheme completely, only has a small amount of modification:
Table 9 PDSCH channel data
Figure BDA00002250671500171
Table 10 PDCCH channel data
Sequence number IE title Explanation
1 UE id For base station side, distinguish different users
2 UE RNTI The user RNTI that base station side is preserved
3 Start CCE The CCE position that this PDCCH is initial
4 CCE Num The number of CCE
5 PDCCH symbol Symbolic information after PDCCH modulation
Table 11 PBCH channel data
Sequence number IE title Explanation
1 PBCH symbol Transmit the symbolic information after PBCH modulation
Table 12 PUSCH channel data
Sequence number IE title Explanation
1 UE id For base station side, distinguish different users
2 UE MAC Instance The MAC instance number of UE
3 RB alloc Info This user uplink RB takies indication
4 PUSCH symbol Symbolic information after PUSCH modulation
Table 13 PUCCH channel data
Sequence number IE title Explanation
1 UE id For base station side, distinguish different users
2 PUCCH symbol Symbolic information after PUCCH modulation
Table 14 PRACH channel data
Sequence number IE title Explanation
1 Preamble Num The preamble code number detecting
2 PRACH symbol Symbolic information after PRACH Channel Modulation
The up-downgoing flow chart of data processing that relates to L1, L2:
1) descending flow chart of data processing is: first BBU receives user's IP packet from core-network side by S1 mouth, removes the GTP-U packet header of core-network side, takes out payload; Number biography protocol stack at BBU is processed, and adds successively PDCP protocol header, rlc protocol head, MAC (Media Access Control, media access control) head; After L2 has completed each user's scheduling, the Base-Band Processing that each user's PDSCH data, PDCCH data and PBCH data are carried out to CRC check, scrambling and modulation, the PDSCH data encapsulation of each user after above Base-Band Processing is become to the form of table 9, the PDCCH data encapsulation of each user after above Base-Band Processing is become to the form of table 10, PBCH data encapsulation after above Base-Band Processing is become to the form of table 11, the data of each down physical channel are sent to RRU by IP network.
RRU side is received each user's that descending BBU side is come PDSCH and PDCCH channel information and community PBCH information by network interface, therefrom extract the bit-level data of each physical channel, the data of each physical channel are carried out respectively to the Base-Band Processing of layer mapping precoding, resource mapping.Last again according to the running time-frequency resource position of each physical channel by PDSCH, PDCCH, the information of PBCH generates OFDM baseband signal after being assembled into a complete wireless sub-frame.Finally from middle radio-frequency module, baseband signal is become to radiofrequency signal sends on antenna.
2) up flow chart of data processing is: RRU receives the up radiofrequency signal of sending of UE by antenna, in process, radio frequency processing is translated into baseband signal, because the moment and the position of UE uplink data sending are all indicated by base station side before, so base station knows that what receive is those users' data and their time-frequency position this moment, in RRU, L1 module is on corresponding running time-frequency resource, solves the symbolic information on the uplink data channels PUSCH of different user; Solve the symbolic information of the ascending control channel information PUSCH of different user, and the information of Random Access Channel PRACH, process is to each user PUSCH, PUCCH, PRACH channel symbol information carries out obtaining after the Base-Band Processing of ofdm signal generation, resource mapping, layer mapping precoding the bit-level data of each user's up channel, the message format that each user's uplink physical channel bit-level data encapsulation is become to table 12,13,14 definition, sends to BBU by IP network by each user uplink physical channel data.
BBU side has been received the PUSCH of different user by IP network, PUCCH, PRACH bit-level information, for PUSCH channel data, complete modulation, the Base-Band Processing of scrambling and CRC check, then BBU is sent to the protocol stack at L2 by it, remove successively MAC, RLC (Radio Link Control, media link is controlled), PDCP (Packet Data Convergence Protocol, PDCP) protocol header, obtain the payload of data, then the L3 transport module in BBU adds the GTP-U protocol header of core-network side, form with IP bag mails to up destination host.For PUCCH channel data, complete the Base-Band Processing of modulation, scrambling and CRC check, then the parameter that BBU therefrom obtains reporting of user is saved in user's context, for instructing the algorithm of scheduling, for PRACH channel data, complete the Base-Band Processing of modulation, scrambling and CRC check, BBU triggers user's access process and processes.
The embodiment of the present invention can also be carried out different divisions, and RRU can carry out at least one processing: ofdm signal generation processing, resource mapping processing, layer mapping precoding processing, modulation treatment, scrambling processing.But different divisions, causes the data volume size of transmitting between BBU and RRU can be different, if data volume is large, still need to transmit by optical fiber.
In the embodiment of L1, L2 part separation, before resource mapping is processed, data between L1, L2 still can be transmitted according to different channels, but in each channel, the expression mode of data can be not identical, after resource mapping is processed, the data of all channels have just been combined, and at this time transmission is exactly a series of complex signal.And from Fig. 3 the LTE system of 4 antennas from core net to BBU again the data volume to RRU change, after resource mapping treatment step, data volume is increased in prior art the data volume of base band data transmission size between BBU and RRU, therefore, preferably, in some embodiments of the invention, resource mapping is processed and ofdm signal generates to process and is all put into RRU and holds and carry out.
Although the embodiment of the present invention is to take LTE system as example, the scheme of L1, L2 separation is equally applicable to UMTS, other wireless access systems such as TD-SCDMA.
Fourth embodiment of the invention provides a kind of BBU and a kind of RRU, is applied to wireless access system, and described wireless access system comprises BBU1000 and RRU2000.
Refer to Figure 13, the BBU1000 in this system comprises:
The first processing unit 1001, for being treated to downlink data waiting for transmission each down physical channel data.
The first transmission unit 1002, for by described each down physical channel transfer of data to described RRU.
The first receiving element 1003, for receiving each physical uplink channel data of described RRU transmission.
The second processing unit 1004, while receiving each physical uplink channel data of described RRU transmission for described the first receiving element, is treated to upstream data by described each physical uplink channel data.
RRU2000 in this system comprises:
The 4th receiving element 2001, for receiving each down physical channel data of described BBU transmission.
The 9th processing unit 2002, while receiving each down physical channel data of described BBU transmission for described the 4th receiving element, is baseband signal by described each down physical channel data processing.
The tenth processing unit 2003, is treated to each physical uplink channel data for described RRU by upstream data waiting for transmission.
The 4th transmission unit 2004, for transferring to described BBU by described each physical uplink channel data.
Wherein, described each down physical channel data comprise: DSCH Downlink Shared Channel data, down control channel data and broadcast channel data; Described each physical uplink channel data comprises: Uplink Shared Channel data, uplink control channel data, rach data and/or Uplink Shared Channel channel associated signalling.
Between BBU1000 and RRU2000, by IP network, transmit data.
According to first embodiment of the invention, at RRU, held the processing of baseband signal, what between BBU and RRU, transmit is each physical channel data, rather than the great base band data of data volume, the data volume of transmission is greatly reduced, thereby can transmit the data between BBU and RRU by IP network, save transmission cost.
Fifth embodiment of the invention provides a kind of BBU and a kind of RRU, is applied to wireless access system, and described wireless access system comprises BBU3000 and RRU4000.
Refer to Figure 14, in BBU3000, described the first processing unit 1001 comprises:
The first scheduling processing unit 3001, for described downlink data waiting for transmission is carried out to dispatch deal, generates described DSCH Downlink Shared Channel data and described down control channel data;
The first generation unit 3002, for cell public information is processed, generates described broadcast channel data;
Described the first transmission unit 1002 comprises:
The second transmission unit 3003, the broadcast channel data generating for described DSCH Downlink Shared Channel data, down control channel data and the first generation unit that described the first scheduling processing unit is generated transfers to described RRU.
Described the first receiving element 1003 comprises:
The second receiving element 3004, for receiving Uplink Shared Channel data, Uplink Shared Channel channel associated signalling, uplink control channel data and the rach data of described RRU transmission;
Described the second processing unit 1004 comprises:
The 3rd processing unit 3005, processes for described Uplink Shared Channel being transferred to number biography protocol stack;
Fourth processing unit 3006, for being used for algorithmic dispatching by described uplink control channel data;
The 5th processing unit 3007, processes described rach data for triggering user's access process.
Correspondingly, refer to Figure 15, in RRU4000, described the 4th receiving element 2001 comprises:
The 5th receiving element 4001, for receiving down channel data, Downlink Control Information and the broadcast channel data of described BBU transmission;
Described the tenth processing unit 2002 comprises:
The 11 processing unit 4002, for being treated to base band data by described down channel data, Downlink Control Information and broadcast channel data.
Described the tenth processing unit 2003 comprises:
The 12 processing unit 4003, for being treated to upstream data waiting for transmission Uplink Shared Channel data, uplink control channel data, rach data and Uplink Shared Channel channel associated signalling;
Described the 4th transmission unit 2004 comprises:
The 5th transmission unit 4004, for transferring to described BBU by described Uplink Shared Channel data, uplink control channel data, rach data and Uplink Shared Channel channel associated signalling.
Between BBU3000 and RRU4000, by IP network, transmit data.
According to fifth embodiment of the invention, by RRU, completed the processing of baseband signal completely, what between BBU and RRU, transmit is each physical channel data, rather than the great base band data of data volume, the data volume of transmission is greatly reduced, thereby can transmit the data between BBU and RRU by IP network, save transmission cost.
Sixth embodiment of the invention provides a kind of BBU and a kind of RRU, is applied to wireless access system, and described wireless access system comprises BBU5000 and RRU6000.
Refer to Figure 16, in BBU5000, described the first processing unit 1001 comprises:
The second scheduling processing unit 5001, for described downlink data waiting for transmission is carried out to dispatch deal, generates described DSCH Downlink Shared Channel data and described down control channel data;
The second generation unit 5002, for cell public information is processed, generates described broadcast channel data;
The first baseband processing unit 5003, for carrying out respectively Base-Band Processing to described DSCH Downlink Shared Channel data, down control channel data and broadcast channel data;
Described the first transmission unit 1002 comprises:
The 3rd transmission unit 5004, for transferring to described RRU by described DSCH Downlink Shared Channel data, down control channel data and broadcast channel data after described the first baseband processing unit Base-Band Processing;
Wherein, described Base-Band Processing comprises following at least one processing: CRC check, scrambling, modulation, layer mapping precoding.
Described the first receiving element 1003 comprises:
The 3rd receiving element 5005, for receiving Uplink Shared Channel data, uplink control channel data and the rach data after the Base-Band Processing of described RRU transmission;
Described the second processing unit 1004 comprises:
The second baseband processing unit 5006, completes for Uplink Shared Channel data, uplink control channel data and rach data to after described Base-Band Processing the Base-Band Processing that described Base-Band Processing is not carried out;
The 6th processing unit 5007, transfers to number and passes protocol stacks and process for described the second baseband processing unit being completed to Uplink Shared Channel after Base-Band Processing;
The 7th processing unit 5008, for completing uplink control channel data after Base-Band Processing for algorithmic dispatching by described;
The 8th processing unit 5009, completes the rach data after Base-Band Processing for triggering user's access process described in processing.
Correspondingly, refer to Figure 17, in RRU6000, described the 4th receiving element 2001 comprises:
The 6th receiving element 6001, for receiving down channel data, Downlink Control Information and the broadcast channel data after the Base-Band Processing of described BBU transmission;
Described the 9th processing unit 2002 comprises:
The 13 processing unit 6002, for being treated to base band data by down channel data, Downlink Control Information and broadcast channel data after Base-Band Processing;
Wherein, described Base-Band Processing comprises following at least one processing: CRC check, scrambling, modulation, layer mapping precoding.
Described the tenth processing unit 2003 comprises:
The 14 processing unit 6003, for being treated to Uplink Shared Channel data, uplink control channel data, rach data by upstream data waiting for transmission;
The 3rd baseband processing unit 6004, for carrying out Base-Band Processing to described Uplink Shared Channel data, uplink control channel data, rach data;
Described the 4th transmission unit 2004 comprises:
The 6th transmission unit 6005, for transferring to described BBU by described Uplink Shared Channel data, uplink control channel data, rach data after Base-Band Processing;
Wherein, described Base-Band Processing comprises following at least one processing: layer mapping precoding, modulation, scrambling, CRC check.
Between BBU5000 and RRU6000, by IP network, transmit data.
According to sixth embodiment of the invention, by RRU, complete part Base-Band Processing, what between BBU and RRU, transmit is each physical channel data, rather than the great base band data of data volume, the data volume of transmission is greatly reduced, thereby can transmit the data between BBU and RRU by IP network, save transmission cost.
The present invention also provides a kind of wireless access system, comprises BBU and RRU described in above embodiment.This wireless access system is applicable to the Radio Access Networks such as LTE, UMTS, TD-SCDMA.
Above disclosed is only preferred embodiment of the present invention, certainly can not limit with this interest field of the present invention, and the equivalent variations of therefore doing according to the claims in the present invention, still belongs to the scope that the present invention is contained.

Claims (29)

1. a data transmission method, is applied to wireless access system, and described wireless access system comprises BBU and RRU, it is characterized in that, described method comprises:
Described BBU is treated to each down physical channel data by downlink data waiting for transmission, and by described each down physical channel transfer of data to described RRU;
When described BBU receives each physical uplink channel data of described RRU transmission, described each physical uplink channel data is treated to upstream data.
2. method according to claim 1, is characterized in that, described each down physical channel data comprise: DSCH Downlink Shared Channel data, down control channel data and broadcast channel data; Described each physical uplink channel data comprises: Uplink Shared Channel data, uplink control channel data, rach data and/or Uplink Shared Channel channel associated signalling.
3. method according to claim 2, is characterized in that, described BBU is treated to each down physical channel data by downlink data waiting for transmission, and by described each down physical channel transfer of data to described RRU, comprising:
Described BBU carries out dispatch deal to described downlink data waiting for transmission, generates described DSCH Downlink Shared Channel data and described down control channel data;
Described BBU processes cell public information, generates described broadcast channel data;
Described BBU transfers to described RRU by described DSCH Downlink Shared Channel data, down control channel data and broadcast channel data.
4. method according to claim 3, is characterized in that, when described BBU receives each physical uplink channel data of described RRU transmission, described each physical uplink channel data is treated to upstream data, comprising:
Described BBU receives Uplink Shared Channel data, Uplink Shared Channel channel associated signalling, uplink control channel data and the rach data of described RRU transmission;
Described BBU transfers to number biography protocol stack by described Uplink Shared Channel and processes;
Described BBU is used for algorithmic dispatching by described uplink control channel data;
Described BBU is used for user's random access procedure by described rach data.
5. method according to claim 2, is characterized in that, described BBU is treated to each down physical channel data by downlink data waiting for transmission, and by described each down physical channel transfer of data to described RRU, comprising:
Described BBU carries out dispatch deal to described downlink data waiting for transmission, generates described DSCH Downlink Shared Channel data and described down control channel data;
Described BBU processes cell public information, generates described broadcast channel data;
Described BBU carries out respectively Base-Band Processing to described DSCH Downlink Shared Channel data, down control channel data and broadcast channel data;
Described BBU transfers to described RRU by described DSCH Downlink Shared Channel data, down control channel data and broadcast channel data after Base-Band Processing;
Wherein, described Base-Band Processing comprises following at least one processing: CRC check, scrambling, modulation, layer mapping precoding.
6. method according to claim 5, is characterized in that, when described BBU receives each physical uplink channel data of described RRU transmission, described each physical uplink channel data is treated to upstream data, comprising:
Described BBU receives Uplink Shared Channel data, uplink control channel data and the rach data after the Base-Band Processing of described RRU transmission;
Uplink Shared Channel data, uplink control channel data and the rach data of described BBU after to described Base-Band Processing completes the Base-Band Processing of not carrying out in described Base-Band Processing;
Described BBU transfers to number biography protocol stack by the described Uplink Shared Channel completing after Base-Band Processing and processes;
Described BBU completes uplink control channel data after Base-Band Processing for algorithmic dispatching by described;
Described BBU completes rach data after Base-Band Processing for user's random access procedure by described.
7. according to the method described in claim 1-6 any one, it is characterized in that, described BBU by IP network by described each down physical channel transfer of data to described RRU; Or described BBU receives each physical uplink channel data of described RRU transmission by IP network.
8. a data transmission method, is applied to wireless access system, and described wireless access system comprises BBU and RRU, it is characterized in that, described method comprises:
When described RRU receives each down physical channel data of described BBU transmission, by described each down physical channel data processing, be baseband signal;
Described RRU is treated to each physical uplink channel data by upstream data waiting for transmission, and described each physical uplink channel data is transferred to described BBU.
9. method according to claim 8, is characterized in that, described each down physical channel data comprise: DSCH Downlink Shared Channel data, down control channel data and broadcast channel data; Described each physical uplink channel data comprises: Uplink Shared Channel data, uplink control channel data, rach data and/or Uplink Shared Channel channel associated signalling.
10. method according to claim 9, is characterized in that, when described RRU receives each down physical channel data of described BBU transmission, by described each down physical channel data processing, is base band data, comprising:
Described RRU receives down channel data, Downlink Control Information and the broadcast channel data of described BBU transmission;
Described RRU is treated to base band data by described down channel data, Downlink Control Information and broadcast channel data.
11. methods according to claim 10, is characterized in that, described RRU is treated to each physical uplink channel data by upstream data waiting for transmission, and described each physical uplink channel data is transferred to described BBU, comprising:
Described RRU is treated to Uplink Shared Channel data, uplink control channel data, rach data and Uplink Shared Channel channel associated signalling by upstream data waiting for transmission;
Described RRU transfers to described BBU by described Uplink Shared Channel data, uplink control channel data, rach data and Uplink Shared Channel channel associated signalling.
12. methods according to claim 9, is characterized in that, when described RRU receives each down physical channel data of described BBU transmission, by described each down physical channel data processing, are base band data, comprising:
Described RRU receives down channel data, Downlink Control Information and the broadcast channel data after the Base-Band Processing of described BBU transmission;
Described RRU is treated to base band data by down channel data, Downlink Control Information and broadcast channel data after described Base-Band Processing;
Wherein, described Base-Band Processing comprises following at least one processing: CRC check, scrambling, modulation, layer mapping precoding.
13. methods according to claim 12, is characterized in that, described RRU is treated to each physical uplink channel data by upstream data waiting for transmission, and described each physical uplink channel data is transferred to described BBU, comprising:
Described RRU is treated to Uplink Shared Channel data, uplink control channel data, rach data by upstream data waiting for transmission;
Described RRU carries out Base-Band Processing to described Uplink Shared Channel data, uplink control channel data, rach data;
Described RRU transfers to described BBU by described Uplink Shared Channel data, uplink control channel data, rach data after Base-Band Processing;
Wherein, described Base-Band Processing comprises following at least one processing: layer mapping precoding, modulation, scrambling, CRC check.
Method described in 14. according to Claim 8-13 any one, is characterized in that, described RRU receives each down physical channel data of described BBU transmission by IP network; Or described RRU transfers to BBU by IP network by described each physical uplink channel data.
15. 1 kinds of BBU, are applied to wireless access system, and described wireless access system comprises BBU and RRU, it is characterized in that, described BBU comprises:
The first processing unit, for being treated to downlink data waiting for transmission each down physical channel data;
The first transmission unit, for by described each down physical channel transfer of data to described RRU;
The first receiving element, for receiving each physical uplink channel data of described RRU transmission;
The second processing unit, while receiving each physical uplink channel data of described RRU transmission for described the first receiving element, is treated to upstream data by described each physical uplink channel data.
16. BBU according to claim 15, is characterized in that, described each down physical channel data comprise: DSCH Downlink Shared Channel data, down control channel data and broadcast channel data; Described each physical uplink channel data comprises: Uplink Shared Channel data, uplink control channel data, rach data and/or Uplink Shared Channel channel associated signalling.
17. BBU according to claim 16, is characterized in that, described the first processing unit comprises:
The first scheduling processing unit, for described downlink data waiting for transmission is carried out to dispatch deal, generates described DSCH Downlink Shared Channel data and described down control channel data;
The first generation unit, for cell public information is processed, generates described broadcast channel data;
Described the first transmission unit comprises:
The second transmission unit, the broadcast channel data generating for described DSCH Downlink Shared Channel data, down control channel data and the first generation unit that described the first scheduling processing unit is generated transfers to described RRU.
18. BBU according to claim 17, is characterized in that, described the first receiving element comprises:
The second receiving element, for receiving Uplink Shared Channel data, Uplink Shared Channel channel associated signalling, uplink control channel data and the rach data of described RRU transmission;
Described the second processing unit comprises:
The 3rd processing unit, processes for described Uplink Shared Channel being transferred to number biography protocol stack;
Fourth processing unit, for being used for algorithmic dispatching by described uplink control channel data;
The 5th processing unit, processes described rach data for triggering user's access process.
19. BBU according to claim 16, is characterized in that, described the first processing unit comprises:
The second scheduling processing unit, for described downlink data waiting for transmission is carried out to dispatch deal, generates described DSCH Downlink Shared Channel data and described down control channel data;
The second generation unit, for cell public information is processed, generates described broadcast channel data;
The first baseband processing unit, for carrying out respectively Base-Band Processing to described DSCH Downlink Shared Channel data, down control channel data and broadcast channel data;
Described the first transmission unit comprises:
The 3rd transmission unit, for transferring to described RRU by described DSCH Downlink Shared Channel data, down control channel data and broadcast channel data after described the first baseband processing unit Base-Band Processing;
Wherein, described Base-Band Processing comprises following at least one processing: CRC check, scrambling, modulation, layer mapping precoding.
20. BBU according to claim 19, is characterized in that, described the first receiving element comprises:
The 3rd receiving element, for receiving Uplink Shared Channel data, uplink control channel data and the rach data after the Base-Band Processing of described RRU transmission;
Described the second processing unit comprises:
The second baseband processing unit, completes for Uplink Shared Channel data, uplink control channel data and rach data to after described Base-Band Processing the Base-Band Processing that described Base-Band Processing is not carried out;
The 6th processing unit, transfers to number and passes protocol stacks and process for described the second baseband processing unit being completed to Uplink Shared Channel after Base-Band Processing;
The 7th processing unit, for completing uplink control channel data after Base-Band Processing for algorithmic dispatching by described;
The 8th processing unit, completes the rach data after Base-Band Processing for triggering user's access process described in processing.
21. according to the BBU described in claim 15-20 any one, it is characterized in that, described BBU by IP network by described each down physical channel transfer of data to described RRU; Or described BBU receives each physical uplink channel data of described RRU transmission by IP network.
22. 1 kinds of RRU, are applied to wireless access system, and described wireless access system comprises BBU and RRU, it is characterized in that, described RRU comprises:
The 4th receiving element, for receiving each down physical channel data of described BBU transmission;
The 9th processing unit, while receiving each down physical channel data of described BBU transmission for described the 4th receiving element, is baseband signal by described each down physical channel data processing;
The tenth processing unit, is treated to each physical uplink channel data for described RRU by upstream data waiting for transmission;
The 4th transmission unit, for transferring to described BBU by described each physical uplink channel data.
23. RRU according to claim 22, is characterized in that, described each down physical channel data comprise: DSCH Downlink Shared Channel data, down control channel data and broadcast channel data; Described each physical uplink channel data comprises: Uplink Shared Channel data, uplink control channel data, rach data and/or Uplink Shared Channel channel associated signalling.
24. RRU according to claim 23, is characterized in that, described the 4th receiving element comprises:
The 5th receiving element, for receiving down channel data, Downlink Control Information and the broadcast channel data of described BBU transmission;
Described the tenth processing unit comprises:
The 11 processing unit, for being treated to base band data by described down channel data, Downlink Control Information and broadcast channel data.
25. RRU according to claim 24, is characterized in that, described the tenth processing unit comprises:
The 12 processing unit, for being treated to upstream data waiting for transmission Uplink Shared Channel data, uplink control channel data, rach data and Uplink Shared Channel channel associated signalling;
Described the 4th transmission unit comprises:
The 5th transmission unit, for transferring to described BBU by described Uplink Shared Channel data, uplink control channel data, rach data and Uplink Shared Channel channel associated signalling.
26. RRU according to claim 23, is characterized in that, described the 4th receiving element comprises:
The 6th receiving element, for receiving down channel data, Downlink Control Information and the broadcast channel data after the Base-Band Processing of described BBU transmission;
Described the 9th processing unit comprises:
The 13 processing unit, for being treated to base band data by down channel data, Downlink Control Information and broadcast channel data after Base-Band Processing;
Wherein, described Base-Band Processing comprises following at least one processing: CRC check, scrambling, modulation, layer mapping precoding.
27. RRU according to claim 26, is characterized in that, described the tenth processing unit comprises:
The 14 processing unit, for being treated to Uplink Shared Channel data, uplink control channel data, rach data by upstream data waiting for transmission;
The 3rd baseband processing unit, for carrying out Base-Band Processing to described Uplink Shared Channel data, uplink control channel data, rach data;
Described the 4th transmission unit comprises:
The 6th transmission unit, for transferring to described BBU by described Uplink Shared Channel data, uplink control channel data, rach data after Base-Band Processing;
Wherein, described Base-Band Processing comprises following at least one processing: layer mapping precoding, modulation, scrambling, CRC check.
28. according to the RRU described in claim 22-27 any one, it is characterized in that, described RRU receives each down physical channel data of described BBU transmission by IP network; Or described RRU transfers to BBU by IP network by described each physical uplink channel data.
29. 1 kinds of wireless access systems, comprise BBU described in claim 15-21 any one and the RRU described in claim 22-28 any one.
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