CN104868982A - Base-band main processing unit, digital front end, baseband unit and data transmission method - Google Patents
Base-band main processing unit, digital front end, baseband unit and data transmission method Download PDFInfo
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Abstract
The present invention provides a base-band main processing unit, a digital front end, a baseband unit and a data transmission method. The baseband main processing unit comprises a first generating module used for obtaining the effective bit data of a downlink common control channel according to the downlink common control channel data; a second generating module used for generating the resource mapping information of the effective bit data; a sending module used for sending the effective bit data of the downlink common control channel and the resource mapping information to the digital front end, so that the digital front end processes the effective bit data of the downlink common control channel, obtains the processed downlink common control channel data and sends the data. According to the technical scheme provided by the present invention, the baseband main processing unit and the digital front end process the downlink common control channel data, thereby facilitating the data interaction after baseband pooling, and supporting the cooperative processing and carrier wave dynamic migration better. The digital front end can be placed in a radio remote unit, thereby reducing the front-haul transmission bandwidth.
Description
Technical field
The present invention relates to the communications field, particularly relate to a kind of base band Main Processor Unit, digital front-end, Base Band Unit and data transmission method.
Background technology
3GPP Long Term Evolution adopts OFDM(Orthogonal Frequency Division Multiplexing, orthogonal frequency division multiplexi) and MIMO(Multiple-Input Multiple-Output, Multiple Input Multiple Output) as the sole criterion of its wireless network evolution.The peak rate of descending 100Mbit/s and up 50Mbit/s can be provided under 20MHz spectral bandwidth.Improve the performance of Cell Edge User, improve cell energies and reduce system delay.Wherein, distributed base station by the BBU(baseband unit of base station, baseband portion) and RRU/RRH(radio remote unit/head, radio frequency part) be separated.BBU is placed in machine room usually, is connected with the RRU being positioned at antenna proximal end by optical fiber.CPRI(common public radio interface is adopted, common public radio interface before BBU and RRU) agreement communicates.This distributed frame has the advantages such as flexible configuration, engineering construction is convenient, environmental suitability is strong, has been widely used in the construction of 3G wireless network.
In prior art, the system architecture of distributed base station as shown in Figure 1, Base Band Unit BBU comprises physical layer and high level, all physical layer process all complete and namely complete all within the physical layer in the processing unit of same Base Band Unit BBU, data after having processed will send to radio frequency remote unit RRU, after being processed accordingly by radio frequency remote unit RRU, send to antenna, therefore, the PDCCH(Physical Downlink Control Channel of LTE), PCFICH(Physical Control Format Indicator Channel) and PHICH(Physical HARQ Indicator Channel) process be complete in the processing unit of same Base Band Unit BBU.
The downlink processing of each community of implementation of above-mentioned existing product is a closed process, is difficult to the demand meeting minizone collaborative process.And in existing product scheme, be point-to-point mapping relations before BBU and RRU, the more difficult flexible exchange realizing data between BBU and RRU.
Summary of the invention
In order to solve the problems of the technologies described above, the invention provides a kind of base band Main Processor Unit, digital front-end, Base Band Unit and data transmission method, the process of downlink common control channel data has been come by base band Main Processor Unit and digital front-end respectively, be conducive to base band Cheng Chihou data interaction on the one hand, thus better support Collaborative process and carrier wave dynamic migration; Also digital front-end can be put into remote radio unit (RRU) on the other hand, reduce front-haul transmission bandwidth.
To achieve these goals, the invention provides a kind of base band Main Processor Unit, comprising: the first generation module, for according to downlink common control channel data, generate the significant bit data of downlink common control channel; Second generation module, for generating the resource mapping information of the significant bit data of described downlink common control channel; Sending module, for the significant bit data of described downlink common control channel and resource mapping information are sent to digital front-end, to make described digital front-end process according to the significant bit data of described resource mapping information to described downlink common control channel, obtain the downlink common control channel Data Concurrent after processing and send.
Preferably, described downlink common control channel data comprise physical mixed automatic re-transmission indicating channel PHICH data; Described first generation module comprises: the first process submodule, for processing PHICH data, obtains the symbol sebolic addressing of PHICH; Transform subblock, for changing the symbol sebolic addressing of described PHICH, obtain changing rear PHICH Bit data, the data volume of the PHICH Bit data after described conversion is less than the data volume of the symbol sebolic addressing of described PHICH; Generate submodule, for generating the significant bit data of down control channel according to the PHICH Bit data after described conversion.
Preferably, physical downlink control channel PDCCH data and Physical Control Format Indicator Channel PCFICH data are also comprised in described down control channel data; Described first generation module, also comprises: the second process submodule, for processing described PDCCH data and PCFICH data, obtains PDCCH Bit data and PCFICH Bit data; Described generation submodule is further used for the significant bit data that the PHICH Bit data after according to described conversion, PDCCH Bit data and PCFICH Bit data generate down control channel.
Preferably, described sending module also for described digital front-end transmission power control information, to make described digital front-end according to described power control information, carries out power control to downlink common control channel.
Present invention also offers a kind of digital front-end, comprising: receiver module, for receiving significant bit data and the resource mapping information of the downlink common control channel that base band Main Processor Unit sends; Processing module, for processing according to the significant bit data of described resource mapping information to described downlink common control channel, obtains the downlink common control channel data after processing; Sending module, for sending the downlink common control channel data after described process.
Preferably, the significant bit data of described downlink common control channel comprise the significant bit data of PHICH, the significant bit data of PDCCH and the significant bit data of PCFICH, when the bit that the significant bit data of described PHICH take is 2 bit, described processing module comprises: the first modulation submodule, for according to the significant bit data of resource mapping information to described PHICH, the significant bit data of PDCCH and the significant bit data of PCFICH carry out Quadrature Phase Shift Keying QPSK modulation, obtain the QPSK modulation symbol of PHICH, the QPSK modulation symbol of PDCCH and the QPSK modulation symbol of PCFICH, 3rd process submodule, for processing the QPSK modulation symbol of the QPSK modulation symbol of described PHICH, the QPSK modulation symbol of PDCCH and PCFICH, obtains the downlink common control channel data after processing.
Preferably, the significant bit data of described downlink common control channel comprise the significant bit data of the significant bit data of PHICH, the significant bit data of PDCCH and PCFICH, when the bit that the significant bit data of described PHICH take is greater than 2 bit, described processing module comprises: the second modulation submodule, for carrying out QPSK modulation according to described resource mapping information to the significant bit data of described PDCCH and the significant bit data of PCFICH, obtain the QPSK modulation symbol of PDCCH and the QPSK modulation symbol of PCFICH; Inverse conversion submodule, for carrying out inverse conversion according to the significant bit data of described resource mapping information to described PHICH, generates the symbol sebolic addressing of PHICH; 4th process submodule, processes for the QPSK modulation symbol of the symbol sebolic addressing to PHICH, PDCCH and the QPSK modulation symbol of PCFICH, obtains the downlink common control channel data after processing.
Preferably, described digital front-end also comprises: power control module, for the power control information sent according to base band Main Processor Unit, carries out power control to downlink common control channel.
Preferably, described digital front-end is arranged at Base Band Unit or Remote Radio Unit.
Present invention also offers a kind of Base Band Unit, comprise base band Main Processor Unit described above and digital front-end described above.
Present invention also offers a kind of data transmission method, for base band Main Processor Unit, described method comprises: according to downlink common control channel data, generates the significant bit data of downlink common control channel; Generate the resource mapping information of the significant bit data of described downlink common control channel; The significant bit data of described downlink common control channel and resource mapping information are sent to digital front-end, to make described digital front-end process according to the significant bit data of described resource mapping information to described downlink common control channel, obtain the downlink common control channel Data Concurrent after processing and send.
Preferably, described downlink common control channel data comprise PHICH data; The significant bit data of described generation downlink common control channel comprise: process PHICH data, obtain the symbol sebolic addressing of PHICH; Change the symbol sebolic addressing of described PHICH, obtain changing rear PHICH Bit data, the data volume of the PHICH Bit data after described conversion is less than the data volume of the symbol sebolic addressing of described PHICH; The significant bit data of downlink common control channel are generated according to PHICH Bit data after described conversion.
Preferably, physical downlink control channel PDCCH data and Physical Control Format Indicator Channel PCFICH data are also comprised in described downlink common control channel data; The significant bit data of described generation downlink common control channel also comprise: process described PDCCH data and PCFICH data, obtain PDCCH Bit data and PCFICH Bit data; The described significant bit data generating downlink common control channel according to PHICH Bit data after described conversion, are specially: the significant bit data generating downlink common control channel according to the PHICH Bit data after described conversion, PDCCH Bit data and PCFICH Bit data.
Present invention also offers a kind of data transmission method, for digital front-end, described method comprises: the significant bit data and the resource mapping information that receive the downlink common control channel that base band Main Processor Unit sends; Process according to the significant bit data of described resource mapping information to described downlink common control channel, obtain the downlink common control channel data after processing; Send the downlink common control channel data after described process.
Preferably, the significant bit data of described downlink common control channel comprise the significant bit data of PHICH, the significant bit data of PDCCH and the significant bit data of PCFICH, when the bit that the significant bit data of described PHICH take is 2 bit, describedly carry out process according to the significant bit data of described resource mapping information to described downlink common control channel and comprise: according to the significant bit data of resource mapping information to described PHICH, the significant bit data of PDCCH and the significant bit data of PCFICH carry out Quadrature Phase Shift Keying QPSK modulation, obtain the QPSK modulation symbol of PHICH, the QPSK modulation symbol of PDCCH and the QPSK modulation symbol of PCFICH, the QPSK modulation symbol of the QPSK modulation symbol of described PHICH, the QPSK modulation symbol of PDCCH and PCFICH is processed, obtains the downlink common control channel data after processing.
Preferably, the significant bit data of described downlink common control channel comprise the significant bit data of PHICH, the significant bit data of PDCCH and the significant bit data of PCFICH, when the bit that the significant bit data of described PHICH take is greater than 2 bit, describedly carry out process according to the significant bit data of described resource mapping information to described downlink common control channel and comprise: according to described resource mapping information, QPSK modulation is carried out to the significant bit data of described PDCCH and the significant bit data of PCFICH, obtain the QPSK modulation symbol of PDCCH and the QPSK modulation symbol of PCFICH, carry out inverse conversion according to the significant bit data of described resource mapping information to described PHICH, generate the symbol sebolic addressing of PHICH, the QPSK modulation symbol of the symbol sebolic addressing of PHICH, the QPSK modulation symbol of PDCCH and PCFICH is processed, obtains the downlink common control channel data after processing.
The beneficial effect of technique scheme of the present invention is as follows:
Technical scheme provided by the invention, by the process of downlink common control channel data is carried out respectively in base band Main Processor Unit and digital front-end, make the processing procedure of downlink common control channel data simply effective, be conducive to base band Cheng Chihou data interaction on the one hand, thus better support Collaborative process and carrier wave dynamic migration; Also digital front-end can be put into remote radio unit (RRU) on the other hand, reduce front-haul transmission bandwidth.
Accompanying drawing explanation
Fig. 1 is the system architecture of distributed base station.
The structural representation of the base band Main Processor Unit that Fig. 2 provides for the embodiment of the present invention 1.
Fig. 3 is the modulation constellation of downlink common control channel data.
Fig. 4 is the flow chart that base band Main Processor Unit processes PHICH data.
The digital front-end structural representation that Fig. 5 provides for the embodiment of the present invention 1.
The structural representation of the Base Band Unit that Fig. 6 provides for the embodiment of the present invention 1.
The flow chart of the data processing method for base band Main Processor Unit that Fig. 7 provides for the embodiment of the present invention 1.
The data processing method flow chart for digital front-end that Fig. 8 provides for the embodiment of the present invention 1.
The flow chart of the processing method of the downlink common control channel data for Base Band Unit that Fig. 9 provides for the embodiment of the present invention 2.
Figure 10 is the data transmission format schematic diagram of the Common Control Channel in the present invention.
Embodiment
For making the technical problem to be solved in the present invention, technical scheme and advantage clearly, be described in detail below in conjunction with the accompanying drawings and the specific embodiments.
The present invention is directed in prior art, the problem of exchanges data inconvenience is carried out between Base Band Unit and Remote Radio Unit, provide a kind of base band Main Processor Unit, digital front-end, Base Band Unit and data transmission method, by the process of downlink common control channel data is carried out respectively in base band Main Processor Unit and digital front-end, make the processing procedure of downlink common control channel data simply effective, be conducive to base band Cheng Chihou data interaction on the one hand, thus better support Collaborative process and carrier wave dynamic migration; Also digital front-end can be put into remote radio unit (RRU) on the other hand, reduce front-haul transmission bandwidth.
The structural representation of the base band Main Processor Unit that Fig. 2 provides for the embodiment of the present invention 1, as shown in the figure, described base band Main Processor Unit 20, comprising:
First generation module 21, for according to downlink common control channel data, generates the significant bit data of downlink common control channel;
Second generation module 22, for generating the resource mapping information of the significant bit data of described downlink common control channel;
Sending module 23, for the significant bit data of described downlink common control channel and resource mapping information are sent to digital front-end, to make described digital front-end process according to the significant bit data of described resource mapping information to described downlink common control channel, obtain the downlink common control channel Data Concurrent after processing and send.
In technique scheme, first generation module 21 is according to downlink common control channel data, generate the significant bit data of downlink common control channel, second generation module 22 generates the resource mapping information of the significant bit data of described downlink common control channel, the significant bit data of this downlink common control channel and resource mapping information send to digital front-end to process by sending module 23, obtain the downlink common control channel data after processing to send.Base band Main Processor Unit has only carried out part processing procedure to downlink common control channel data, and to obtain the significant bit data of downlink common control channel and to generate corresponding resource mapping information, processing procedure is simple.
The significant bit data of the significant bit data of PDCCH, the significant bit data of PHICH and PCFICH can be comprised in the significant bit data of the downlink common control channel that base band Main Processor Unit first generation module obtains, some parameter signal data and some other data can also be comprised, for other data without the need to processing it.Because PDCCH and PCFICH can both adopt QPSK to modulate, and PHICH is in the constellation point being accessed QPSK modulation after BPSK modulation and spread processing by transformation energy, therefore, digital front-end, receiving the significant bit data of this downlink common control channel, can process it.But as shown in Figure 3, the constellation point that the constellation point of PHICH and QPSK modulate has the skew of 45 °, therefore digital front-end needs type and the position of the significant bit data knowing received effective downlink common control channel.The resource mapping information of the position and type that include the significant bit data of effective downlink common control channel is sent to digital front-end by sending module, and digital front-end can process the significant bit data of downlink common control channel more easily according to this resource mapping information.
Base band Main Processor Unit needs the significant bit data of downlink common control channel and resource mapping information to send to digital front-end, follow-up processing procedure is completed to make digital front-end, therefore, base band Main Processor Unit needs to carry out communicating to transmit data with digital front-end, when descending public control channel data comprises physical mixed automatic re-transmission indicating channel PHICH data, the significant bit data of the downlink common control channel that the first generation module obtains comprise the significant bit data of PHICH, the bit taken due to the significant bit data of PHICH is large, volume of transmitted data can be caused large, the performance of system is impacted, therefore, need to process the significant bit data of PHICH, reduce volume of transmitted data.
Therefore, when described downlink common control channel data comprise physical mixed automatic re-transmission indicating channel PHICH data; Described first generation module can comprise: the first process submodule, for processing PHICH data, obtains the symbol sebolic addressing of PHICH; Transform subblock, for changing the symbol sebolic addressing of described PHICH, obtain changing rear PHICH Bit data, the data volume of the PHICH Bit data after described conversion is less than the symbol sebolic addressing of described PHICH; Generate submodule, for generating the significant bit data of downlink common control channel according to PHICH Bit data after described conversion.
In technique scheme, first process submodule processes PHICH data, obtain the symbol sebolic addressing of PHICH, transform subblock is by changing the symbol sebolic addressing of PHICH, obtain PHICH Bit data, the data volume of the PHICH Bit data after conversion is less than the data volume of the symbol sebolic addressing of PHICH, generate submodule generates down control channel significant bit data according to the PHICH Bit data after conversion, thus, when making base band Main Processor Unit send the significant bit data of downlink common control channel to digital front-end, the data volume transmitted diminishes, avoid the excessive problem caused of transmitted data amount.
Wherein, transform subblock is when changing the symbol sebolic addressing of PHICH, can according to the mapping relations of the symbol sebolic addressing of the large PHICH of data volume preset and the little PHICH Bit data of data volume, the symbol sebolic addressing of PHICH large for data volume is converted to the PHICH Bit data that data volume is little, such as, when the value of the symbol sebolic addressing of PHICH only have 4 kinds may time, 2 bits can be used to represent the symbol sebolic addressing of this PHICH different in 4.
Preferably, described first process submodule can also comprise: channel encoding unit, for carrying out chnnel coding to PHICH data, forms the PHICH Bit data after coding; Modulating unit, for carrying out BPSK modulation to the PHICH Bit data after coding, generates the modulation symbol of PHICH; Spectrum-spreading unit, for carrying out spread processing to the modulation symbol of described PHICH, obtains the symbol sebolic addressing of PHICH.
In technique scheme, PHICH carries the ACK/NACK of HARQ, and whether instruction eNodeB correctly receives the transmission of PUSCH.Fig. 4 is the flow chart that base band Main Processor Unit processes PHICH data, as shown in the figure, when processing PHICH data, first carry out repeated encoding by channel encoding unit to PHICH data, the ACK/NACK of 1 bit exports 3 identical bits after repeated encoding; Then by modulating unit, BPSK modulation is carried out to these 3 bits, obtain 3 modulation symbols; Finally by spectrum-spreading unit, spread processing is carried out to it, under conventional CP, Walsh spread code length is 4,12 modulation symbol sequences are obtained after spread spectrum, after obtaining modulation symbol sequence, transform subblock, by changing the symbol sebolic addressing of PHICH, obtains PHICH Bit data, and the data volume of the PHICH Bit data after conversion is less than the data volume of the symbol sebolic addressing of PHICH.
Preferably, physical downlink control channel PDCCH data and Physical Control Format Indicator Channel PCFICH data are also comprised in described downlink common control channel data; Described first generation module, can also comprise: the second process submodule, for processing described PDCCH data and PCFICH data, obtains PDCCH Bit data and PCFICH Bit data; Described generation submodule is further used for the significant bit data generating downlink common control channel according to PHICH Bit data, PDCCH Bit data and PCFICH Bit data after described conversion.
In technique scheme, downlink common control channel data also comprise PCFICH data and PDCCH data.
The CFI information that PCFICH carries 12 bit represents the OFDM(Orthogonal Frequency Division Multiplexing orthogonal frequency division multiplexi transmitted for control channel in each subframe, the one of multi-carrier modulation) symbolic number (usually, this symbolic number is 1,2,3).PCFICH, after the block forecast of (32,2), becomes information bit and PCFICH Bit data.
PDCCH bear control information, through CRC(Cyclical Redundancy Check, redundancy check) after process, obtain PDCCH Bit data through chnnel coding, chnnel coding adopts tail-biting convolutional code usually, code check 1/3.
By the second process submodule, chnnel coding is carried out to PDCCH data and PCFICH data, after obtaining the PCFICH Bit data after the PDCCH Bit data after encoding and coding, carry out scrambling process, obtain the PCFICH Bit data after the PDCCH Bit data after scrambling and scrambling, the PCFICH Bit data after generation submodule is further used for the PDCCH Bit data after according to PHICH Bit data, scrambling after described conversion and scrambling generates the significant bit data of downlink common control channel
Preferably, described sending module can also be used for, to described digital front-end transmission power control information, to make described digital front-end according to described power control information, carrying out power control to downlink common control channel.
In technique scheme, sending module, by digital front-end transmission power control information, makes digital front-end can carry out power control to downlink common control channel.
Wherein, power control information can be the power of each down channel and the relative value of gross power, and such as, if gross power represents with numerical value 10, the power of PDCCH and the relative value of gross power are 0.5, then the magnitude of power of PDCCH is expressed as 5.According to the power level representated by numerical value 10, the power level of PDCCH just can be learnt.
The digital front-end structural representation that Fig. 5 provides for the embodiment of the present invention 1.As shown in the figure, described digital front-end 50, comprising:
Receiver module 51, for receiving significant bit data and the resource mapping information of the downlink common control channel that base band Main Processor Unit sends;
Processing module 52, for processing according to the significant bit data of described resource mapping information to described downlink common control channel, obtains the downlink common control channel data after processing;
Sending module 53, for sending the downlink common control channel data after described process.
In technique scheme, digital front-end receives significant bit data and the resource mapping information of the downlink common control channel that base band Main Processor Unit sends by receiver module, process through processing module obtains the downlink common control channel data after processing, and carries out transmission send by sending module.Digital front-end completes follow-up processing procedure after the data receiving the transmission of base band Main Processor Unit, obtains the downlink common control channel data after processing.
Preferably, the significant bit data of described downlink common control channel comprise the significant bit data of PHICH, the significant bit data of PDCCH and the significant bit data of PCFICH, when the bit that the significant bit data of described PHICH take is 2 bit, described processing module can comprise: the first modulation submodule, for according to the significant bit data of resource mapping information to described PHICH, the significant bit data of PDCCH and the significant bit data of PCFICH carry out Quadrature Phase Shift Keying QPSK modulation, obtain the QPSK modulation symbol of PHICH, the QPSK modulation symbol of PDCCH and the QPSK modulation symbol of PCFICH, 3rd process submodule, for processing the QPSK modulation symbol of the QPSK modulation symbol of described PHICH, the QPSK modulation symbol of PDCCH and PCFICH, obtains the downlink common control channel data after processing.
In technique scheme, the significant bit data of downlink common control channel comprise the significant bit data of PHICH, the significant bit data of PDCCH and the significant bit data of PCFICH, when the bit that the significant bit data of PHICH take is 2 bits, the number of bits taken due to the significant bit data of PDCCH and the significant bit data of PCFICH is also 2 bits, therefore, the significant bit data of this PHICH, the significant bit data of PDCCH and the significant bit data of PCFICH all can adopt QPSK modulation system to modulate it, therefore, by the first modulation submodule according to the significant bit data of resource mapping information to PHICH, the significant bit data of PDCCH and the significant bit data of PCFICH carry out QPSK modulation, obtain the QPSK modulation symbol of PHICH, after the QPSK modulation symbol of PDCCH and the QPSK modulation symbol of PCFICH, processed by the 3rd process submodule, obtain the downlink common control channel data after processing.
Preferably, the significant bit data of described downlink common control channel comprise the significant bit data of the significant bit data of PHICH, the significant bit data of PDCCH and PCFICH, when the bit that the significant bit data of described PHICH take is greater than 2 bit, described processing module comprises: the second modulation submodule, for carrying out QPSK modulation according to resource mapping information to the significant bit data of described PDCCH and the significant bit data of PCFICH, obtain the QPSK modulation symbol of PDCCH and the QPSK modulation symbol of PCFICH; Inverse conversion submodule, for carrying out inverse conversion according to the significant bit data of resource mapping information to described PHICH, generates the symbol sebolic addressing of PHICH; 4th process submodule, processes for the QPSK modulation symbol of the symbol sebolic addressing to PHICH, PDCCH and the QPSK modulation symbol of PCFICH, obtains the downlink common control channel data after processing.
In technique scheme, the significant bit data of downlink common control channel comprise the significant bit data of the significant bit data of PHICH, the significant bit data of PDCCH and PCFICH, the number of bits that the significant bit data of PDCCH and the significant bit data of PCFICH take is 2 bits, therefore, QPSK modulation can be carried out to the significant bit data of the significant bit data of PDCCH and PCFICH; When the bit that the significant bit data of PHICH take is greater than 2 bit, QPSK can not be used to modulate, therefore, need to carry out inverse conversion by the significant bit data of inverse conversion submodule to PHICH, generate the symbol sebolic addressing of PHICH, second modulation submodule carries out QPSK modulation to the significant bit data of PDCCH and the significant bit data of PCFICH, the QPSK modulation symbol of 4th process submodule to the symbol sebolic addressing of PHICH, the QPSK modulation symbol of PDCCH and PCFICH processes, and obtains the downlink common control channel data after processing.
Preferably, described digital front-end can also comprise: power control module, for the power control information sent according to base band Main Processor Unit, carries out power control to downlink common control channel.
In technique scheme, power control can be carried out by power control module to needing the channel carrying out power control.
Preferably, described digital front-end is arranged at Base Band Unit or Remote Radio Unit.
The structural representation of the Base Band Unit that Fig. 6 provides for the embodiment of the present invention 1.As described in Figure, Base Band Unit 60, comprises base band Main Processor Unit 61 and digital front-end 62.
Base band Main Processor Unit 61 comprises:
First downlink processing module, for realizing the function of the first generation module in base band Main Processor Unit that the embodiment of the present invention 1 provides, having carried out part process to downlink common control channel data, having obtained the significant bit data of downlink common control channel;
Control information generation module: for realizing the function of the second generation module in base band Main Processor Unit that the embodiment of the present invention 1 provides, generate resource mapping information;
Sending module, for sending to digital front-end by the significant bit data of downlink common control channel and resource mapping information by data transmission network;
High-rise process, for the treatment of the operation of other high levels except physical layer.
Digital front-end 62 comprises:
Receiver module, for receiving the data sent from base band Main Processor Unit 61 by data transmission network;
Second downlink processing module, for realizing the function of the processing module of the digital front-end that the embodiment of the present invention 1 provides, has carried out follow-up process to the significant bit data of downlink common control channel, the downlink common control channel data after generating process;
Sending module, for sending to RRU by the downlink common control channel data after process.
In the above-described embodiments, digital front-end and base band Main Processor Unit are all placed in Base Band Unit, in fact, digital front-end also can be placed in RRU.
The flow chart of the data processing method for base band Main Processor Unit that Fig. 7 provides for the embodiment of the present invention 1.As shown in the figure, described method comprises:
Step S700, according to downlink common control channel data, obtains significant bit data and the resource mapping information of downlink common control channel;
Step S702, the significant bit data of described downlink common control channel and resource mapping information are sent to digital front-end, to make described digital front-end process according to the significant bit data of described resource mapping information to described downlink common control channel, obtain the downlink common control channel Data Concurrent after processing and send.
Preferably, described downlink common control channel data comprise PHICH data; The significant bit data of described generation downlink common control channel comprise: process PHICH data, obtain the symbol sebolic addressing of PHICH; Change the symbol sebolic addressing of described PHICH, obtain changing rear PHICH Bit data, the data volume of the PHICH Bit data after described conversion is less than the data volume of the symbol sebolic addressing of described PHICH; The significant bit data of downlink common control channel are generated according to PHICH Bit data after described conversion.
Preferably, PHICH data are processed, obtain the symbol sebolic addressing of PHICH, can be specially: chnnel coding is carried out to PHICH data, form the PHICH data bit data after coding; BPSK modulation is carried out to the PHICH Bit data after coding, generates the modulation symbol of PHICH; Spread processing is carried out to the modulation symbol of described PHICH, obtains the symbol sebolic addressing of PHICH.
Preferably, physical downlink control channel PDCCH data and Physical Control Format Indicator Channel PCFICH data are also comprised in described downlink common control channel data; The significant bit data of described generation downlink common control channel also comprise: process described PDCCH data and PCFICH data, obtain PDCCH Bit data and PCFICH Bit data; The described significant bit data generating downlink common control channel according to PHICH Bit data after described conversion, are specially: the significant bit data generating downlink common control channel according to the PHICH Bit data after described conversion, PDCCH Bit data and PCFICH Bit data.
The data processing method flow chart for digital front-end that Fig. 8 provides for the embodiment of the present invention 1.As shown in the figure, described method comprises:
Step S800, receives significant bit data and the resource mapping information of the downlink common control channel that base band Main Processor Unit sends;
Step S802, processes according to the significant bit data of described resource mapping information to described downlink common control channel, obtains the downlink common control channel data after processing;
Step S806, sends the downlink common control channel data after described process.
Preferably, the significant bit data of described downlink common control channel comprise the significant bit data of PHICH, the significant bit data of PDCCH and the significant bit data of PCFICH, when the bit that the significant bit data of described PHICH take is 2 bit, describedly carry out process according to the significant bit data of described resource mapping information to described downlink common control channel and comprise: according to the significant bit data of resource mapping information to described PHICH, the significant bit data of PDCCH and the significant bit data of PCFICH carry out Quadrature Phase Shift Keying QPSK modulation, obtain the QPSK modulation symbol of PHICH, the QPSK modulation symbol of PDCCH and the QPSK modulation symbol of PCFICH, the QPSK modulation symbol of the QPSK modulation symbol of described PHICH, the QPSK modulation symbol of PDCCH and PCFICH is processed, obtains the downlink common control channel data after processing.
Preferably, the significant bit data of described downlink common control channel comprise the significant bit data of PHICH, the significant bit data of PDCCH and the significant bit data of PCFICH, when the bit that the significant bit data of described PHICH take is greater than 2 bit, describedly carry out process according to the significant bit data of described resource mapping information to described downlink common control channel and comprise: according to described resource mapping information, QPSK modulation is carried out to the significant bit data of described PDCCH and the significant bit data of PCFICH, obtain the QPSK modulation symbol of PDCCH and the QPSK modulation symbol of PCFICH, carry out inverse conversion according to the significant bit data of described resource mapping information to described PHICH, generate the symbol sebolic addressing of PHICH, the QPSK modulation symbol of the symbol sebolic addressing of PHICH, the QPSK modulation symbol of PDCCH and PCFICH is processed, obtains the downlink common control channel data after processing.
The flow chart of the processing method of the downlink common control channel data for Base Band Unit that Fig. 9 provides for the embodiment of the present invention 2.As shown in the figure, described method, comprising:
Step S900, carries out chnnel coding to downlink common control channel data, and downlink common control channel data comprise PDCCH data, PHICH data and PCFICH data;
Step S902, carries out scrambling process to the PDCCH data after chnnel coding process and PCFICH data, obtains PDCCH Bit data and PCFICH Bit data, enters step S910;
Step S904, carries out BPSK modulation to the PHICH data after chnnel coding process, obtains PHICH symbol sebolic addressing;
Step S906, carries out spread spectrum to PHICH symbol sebolic addressing, obtains the PHICH symbol sebolic addressing after spread spectrum;
Step S908, changes the PHICH symbol sebolic addressing after spread spectrum, obtains PHICH Bit data.
Step S910, generates the significant bit data of PDCCH, the significant bit data of PHICH, the significant bit data of PCFICH and resource mapping information.
Step S912, carries out QPSK modulation according to the significant bit data of resource mapping information to the significant bit data of PDCCH, the significant bit data of PHICH and PCFICH, obtains the downlink common control channel data after modulating; In this step, each Bit data obtains QPSK modulation symbol sequence through ovennodulation, the downlink common control channel data namely after modulation, for the significant bit data of PCFICH, after QPSK modulation, is modulated into 16 symbols.
Step S914, carries out layer mapping and precoding to the downlink common control channel data after modulation;
Step S916, carries out resource mapping to the downlink common control channel data through layer mapping and precoding; In this step, downlink common control channel data after layer mapping and precoding carry out resource mapping, be mapped on RE, with PCFICH data instance, 16 symbols after being modulated by QPSK are after layer mapping and precoding, carry out resource mapping, be mapped to 4 REG(RE Group) on.
Step S918, carries out IFFT(InverseFast Fourier Transformation to the downlink common control channel data through resource mapping, inverse fast Fourier transform) process; This step realizes the modulation of OFDM symbol.
Step S920, carries out Add CP(Cyclic Prefix to the downlink common control channel data after IFFT process, Cyclic Prefix) process, obtain CPRI data; This step is actually to ensure quadrature, prevents the auxiliary carrier wave from obscuring mutually with another carrier wave.
CPRI data are sent to RRU by step S922.
Figure 10 is the data transmission format schematic diagram of the Common Control Channel in the present invention.As shown in the figure, PDCCH, PCFICH and PHICH data and relevant control information is contained in this transformat.
Wherein, illustrating each field length can depending on specific implementation situation, and each field present position not successively position relationship.The implication of each field is as follows:
Frame number: the radio frame number belonging to data of instruction this time transmission;
Subframe numbers: the radio sub-frame number belonging to data of instruction this time transmission;
Type indicates: indicate current transformat to be the transformat of PDCCH, PCFICH and PHICH data and relevant control information;
The OFDM symbol number M of control channel transmission: the OFDM symbol number of control channel transmission in instruction present sub-frame, the usual value of M is 1,2,3;
The power ratio of PDCCH and RS: the power of instruction PDCCH channel accounts for the ratio of gross power;
The power ratio of PCFICH and RS: the power of instruction PCFICH channel accounts for the ratio of gross power;
The power ratio of PHICH and RS: the power of instruction PHICH channel accounts for the ratio of gross power;
The data of the PDCCH/PCFICH/PHICH in the OFDM symbol 0 of control channel transmission: the Bit data before PDCCH, PCFICH or PHICH modulation of the 0th OFDM symbol indicating certain control channel to transmit, digital front-end is receiving this data, when OFDM modulation is carried out to it, these data are mapped in the 0th OFDM symbol, as a rule, the maximum length of these data is 1200, namely from RE0000 to RE1199;
The map information of the PDCCH/PCFICH/PHICH in the OFDM symbol 0 of control channel transmission: the resource mapping indication information of the 0th OFDM symbol indicating certain control channel to transmit, represent that the data of the PDCCH/PCFICH/PHICH in the OFDM symbol 0 that corresponding control channel transmits are the data for transmitting PDCCH, or for transmitting the data of PCFICH, or for transmitting the data of PHICH, as a rule, the maximum length of these data is 1200, namely from Hint0000 to Hint1199, the data of the PDCCH/PCFICH/PHICH in the OFDM symbol 0 of control channel transmission that difference is corresponding,
As mentioned above, if the map information of the PDCCH/PCFICH/PHICH in the OFDM symbol 0 of control channel transmission represents with two bits, then can define:
00: the data invalid representing the PDCCH/PCFICH/PHICH in the OFDM symbol 0 that corresponding control channel transmits;
01: the data representing the PDCCH/PCFICH/PHICH in the OFDM symbol 0 of corresponding control channel transmission effectively and carry PDCCH data;
10: the data representing the PDCCH/PCFICH/PHICH in the OFDM symbol 0 of corresponding control channel transmission effectively and carry PHICH data;
11: the data representing the PDCCH/PCFICH/PHICH in the OFDM symbol 0 of corresponding transmission processed effectively and carry PCFICH data;
The data of the PDCCH/PCFICH/PHICH on the OFDM symbol M-1 of control channel transmission: the Bit data before PDCCH, PCFICH or PHICH modulation of M-1 the OFDM symbol indicating certain control channel to transmit;
The map information of the PDCCH/PCFICH/PHICH on the OFDM symbol M-1 of control channel transmission: the resource mapping indication information of M-1 the OFDM symbol indicating certain control channel to transmit.
Therefore, can modulate PDCCH, PCFICH and PHICH data received according to resource mapping indication information, the process such as layer maps, precoding and resource mapping.
The above is the preferred embodiment of the present invention; it should be pointed out that for those skilled in the art, under the prerequisite not departing from principle of the present invention; can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.
Claims (16)
1. a base band Main Processor Unit, is characterized in that, comprising:
First generation module, for according to downlink common control channel data, generates the significant bit data of downlink common control channel;
Second generation module, for generating the resource mapping information of the significant bit data of described downlink common control channel;
Sending module, for the significant bit data of described downlink common control channel and resource mapping information are sent to digital front-end, to make described digital front-end process according to the significant bit data of described resource mapping information to described downlink common control channel, obtain the downlink common control channel Data Concurrent after processing and send.
2. base band Main Processor Unit as claimed in claim 1, it is characterized in that, described downlink common control channel data comprise physical mixed automatic re-transmission indicating channel PHICH data; Described first generation module comprises:
First process submodule, for processing PHICH data, obtains the symbol sebolic addressing of PHICH;
Transform subblock, for changing the symbol sebolic addressing of described PHICH, obtain changing rear PHICH Bit data, the data volume of the PHICH Bit data after described conversion is less than the data volume of the symbol sebolic addressing of described PHICH;
Generate submodule, for generating the significant bit data of down control channel according to the PHICH Bit data after described conversion.
3. base band Main Processor Unit as claimed in claim 2, is characterized in that, also comprise physical downlink control channel PDCCH data and Physical Control Format Indicator Channel PCFICH data in described downlink common control channel data; Described first generation module, also comprises:
Second process submodule, for processing described PDCCH data and PCFICH data, obtains PDCCH Bit data and PCFICH Bit data;
Described generation submodule is further used for the significant bit data that the PHICH Bit data after according to described conversion, PDCCH Bit data and PCFICH Bit data generate downlink common control channel.
4. base band Main Processor Unit as claimed in claim 1, it is characterized in that, described sending module also for described digital front-end transmission power control information, to make described digital front-end according to described power control information, carries out power control to downlink common control channel.
5. a digital front-end, is characterized in that, comprising:
Receiver module, for receiving significant bit data and the resource mapping information of the downlink common control channel that base band Main Processor Unit sends;
Processing module, for processing according to the significant bit data of described resource mapping information to described downlink common control channel, obtains the downlink common control channel data after processing;
Sending module, for sending the downlink common control channel data after described process.
6. digital front-end as claimed in claim 5, it is characterized in that, the significant bit data of described downlink common control channel comprise the significant bit data of the significant bit data of PHICH, the significant bit data of PDCCH and PCFICH, when the bit that the significant bit data of described PHICH take is 2 bit, described processing module comprises:
First modulation submodule, for carrying out Quadrature Phase Shift Keying QPSK modulation according to the significant bit data of resource mapping information to the significant bit data of described PHICH, the significant bit data of PDCCH and PCFICH, obtain the QPSK modulation symbol of the QPSK modulation symbol of PHICH, the QPSK modulation symbol of PDCCH and PCFICH;
3rd process submodule, for processing the QPSK modulation symbol of the QPSK modulation symbol of described PHICH, the QPSK modulation symbol of PDCCH and PCFICH, obtains the downlink common control channel data after processing.
7. digital front-end as claimed in claim 5, it is characterized in that, the significant bit data of described downlink common control channel comprise the significant bit data of the significant bit data of PHICH, the significant bit data of PDCCH and PCFICH, when the bit that the significant bit data of described PHICH take is greater than 2 bit, described processing module comprises:
Second modulation submodule, for carrying out QPSK modulation according to described resource mapping information to the significant bit data of described PDCCH and the significant bit data of PCFICH, obtains the QPSK modulation symbol of PDCCH and the QPSK modulation symbol of PCFICH;
Inverse conversion submodule, for carrying out inverse conversion according to the significant bit data of described resource mapping information to described PHICH, generates the symbol sebolic addressing of PHICH;
4th process submodule, processes for the QPSK modulation symbol of the symbol sebolic addressing to PHICH, PDCCH and the QPSK modulation symbol of PCFICH, obtains the downlink common control channel data after processing.
8. digital front-end as claimed in claim 5, is characterized in that, also comprise:
Power control module, for the power control information sent according to base band Main Processor Unit, carries out power control to downlink common control channel.
9. digital front-end as claimed in claim 5, it is characterized in that, described digital front-end is arranged in Base Band Unit or Remote Radio Unit.
10. a Base Band Unit, to comprise as described in any one of claim 1-4 base band Main Processor Unit and digital front-end as described in any one of claim 5-8.
11. 1 kinds of data transmission methods, is characterized in that, for base band Main Processor Unit, the method comprises:
According to downlink common control channel data, generate the significant bit data of downlink common control channel;
Generate the resource mapping information of the significant bit data of described downlink common control channel;
The significant bit data of described downlink common control channel and resource mapping information are sent to digital front-end, to make described digital front-end process according to the significant bit data of described resource mapping information to described downlink common control channel, obtain the downlink common control channel Data Concurrent after processing and send.
12. methods as claimed in claim 11, it is characterized in that, described downlink common control channel data comprise PHICH data; The significant bit data of described generation downlink common control channel comprise:
PHICH data are processed, obtains the symbol sebolic addressing of PHICH;
Change the symbol sebolic addressing of described PHICH, obtain changing rear PHICH Bit data, the data volume of the PHICH Bit data after described conversion is less than the data volume of the symbol sebolic addressing of described PHICH;
The significant bit data of downlink common control channel are generated according to PHICH Bit data after described conversion.
13. methods as claimed in claim 12, is characterized in that, also comprise physical downlink control channel PDCCH data and Physical Control Format Indicator Channel PCFICH data in described downlink common control channel data; The significant bit data of described generation downlink common control channel also comprise:
Described PDCCH data and PCFICH data are processed, obtains PDCCH Bit data and PCFICH Bit data;
The described significant bit data generating downlink common control channel according to PHICH Bit data after described conversion, are specially:
The significant bit data of downlink common control channel are generated according to the PHICH Bit data after described conversion, PDCCH Bit data and PCFICH Bit data.
14. 1 kinds of data transmission methods, is characterized in that, for digital front-end, described method comprises:
Receive significant bit data and the resource mapping information of the downlink common control channel that base band Main Processor Unit sends;
Process according to the significant bit data of described resource mapping information to described downlink common control channel, obtain the downlink common control channel data after processing;
Send the downlink common control channel data after described process.
15. methods as claimed in claim 14, it is characterized in that, the significant bit data of described downlink common control channel comprise the significant bit data of the significant bit data of PHICH, the significant bit data of PDCCH and PCFICH, when the bit that the significant bit data of described PHICH take is 2 bit, describedly carries out process according to the significant bit data of described resource mapping information to described downlink common control channel and comprise:
Carry out Quadrature Phase Shift Keying QPSK modulation according to the significant bit data of resource mapping information to the significant bit data of described PHICH, the significant bit data of PDCCH and PCFICH, obtain the QPSK modulation symbol of the QPSK modulation symbol of PHICH, the QPSK modulation symbol of PDCCH and PCFICH;
The QPSK modulation symbol of the QPSK modulation symbol of described PHICH, the QPSK modulation symbol of PDCCH and PCFICH is processed, obtains the downlink common control channel data after processing.
16. methods as claimed in claim 14, it is characterized in that, the significant bit data of described downlink common control channel comprise the significant bit data of the significant bit data of PHICH, the significant bit data of PDCCH and PCFICH, when the bit that the significant bit data of described PHICH take is greater than 2 bit, describedly carries out process according to the significant bit data of described resource mapping information to described downlink common control channel and comprise:
According to described resource mapping information, QPSK modulation is carried out to the significant bit data of described PDCCH and the significant bit data of PCFICH, obtain the QPSK modulation symbol of PDCCH and the QPSK modulation symbol of PCFICH;
Carry out inverse conversion according to the significant bit data of described resource mapping information to described PHICH, generate the symbol sebolic addressing of PHICH;
The QPSK modulation symbol of the symbol sebolic addressing of PHICH, the QPSK modulation symbol of PDCCH and PCFICH is processed, obtains the downlink common control channel data after processing.
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