CN101715214A - Method and system for transmitting same-phase orthogonal data - Google Patents
Method and system for transmitting same-phase orthogonal data Download PDFInfo
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Abstract
The invention discloses a method and a system for transmitting same-phase orthogonal data. The method comprises the following steps of: for one or more standards, determining an IQ mapping mode adopted by each standard, and determining information on AxC Container in the IQ mapping mode corresponding to each standard and parameters of the standard in the corresponding IQ mapping mode; dividing an IQ data block (IQ Data Block) of a basic frame, wherein the divided IQ Data Block comprises a part for loading the AxC Container of all the standards and a part for providing a timing reference of AxC Container Block; and transmitting and/or restoring radio service IQ data of the standard on a CPRI interface by using radio equipment controller (REC) or radio equipment (RE) according to the determined IQ mapping mode corresponding to the standard. The method and the system enhance the compatibility and the flexibility of the interface.
Description
Technical field
The present invention relates to the communications field, in particular to inphase quadrature (In-Phase/Quardrature abbreviates IQ as) data transmission method and system based on common public radio interface (Common Public Radio Interface is called for short CPRI) agreement.
Background technology
Common public radio interface (Common Public Radio Interface, abbreviation CPRI) alliance is an industrial cooperation tissue, be devoted to be engaged in wireless base station internal wireless device controller (Radio Equipment Controlller, be called for short REC) and wireless device (RadioEquipment is called for short RE) between the formulation work of main interface specification.The CPRI agreement is as third generation partner program (3rd Generation Partnership Project, abbreviate 3GPP as) one replenish, it makes can have difference flexibly and effectively between product, also makes the various piece of base station can both be better benefit from the technological progress in field separately.The establishment of CPRI helps the standardization of wireless base station auxiliary products, makes communications equipment manufacturer can selectively buy the wireless base station subsystem, thereby improves product development rate, shortens the new product release time, and guarantees the rich of product.
CPRI approves as a kind of industry, generalization, wave point cheaply, initial stage is to insert (Wideband Code Division Multiple Access at Wideband Code Division Multiple Access (WCDMA), abbreviate WCDMA as) and work out, up-to-date CPRI 4.0 agreements increase micro-wave access global inter communication (Worldwide Interoperability for Microwave Access, abbreviate WIMAX as) and Long Term Evolution (Long Term Evolution, abbreviate LTE as) support, but, transmission when up-to-date CPRI4.0 agreement is not still clearly supported other wireless standards and multiple wireless standard.
Fig. 1 is the schematic diagram according to the CPRI protocol architecture of correlation technique, as shown in Figure 1, physical layer (Layer 1) has defined speed, coding, frame format and the inphase quadrature (In-Phase/Quardrature of CPRI interface, abbreviate IQ as) content such as data map, link layer (Layer 2) has defined the contents such as frame format of chain of command data.
Defined multi-frame structure in the CPRI interface specification, Fig. 2 is the schematic diagram according to the wireless frame structure of the CPRI agreement of correlation technique, as shown in Figure 2, in WCDMA, a radio frames (Radio Frame) is by Node B frame number (Node B Frame Number, abbreviate BFN as) numbering, comprise 150 superframes (Hyper Frame), superframe comprises 256 basic frames (Basic Frame), basic frame comprises some words (Word), W represents Word number in the basic frame among Fig. 2, and Y represents byte among the Word (byte).The time span of Radio Frame is 10ms, inserts special synchronization character (Comma byte) in the control word byte of Radio Frame, just can realize the 10ms clock synchronization between REC and the RE.
Basic Frame is the elementary cell of CPRI frame structure, Fig. 3 is the schematic diagram according to the basic frame structure under the 1.2288G wire rate of the CPRI agreement of correlation technique, as shown in Figure 3, W represents the word number among the Basic Frame among Fig. 3, the W value is 0～15, the word of W=0 is control word (control word), and remaining 15 word is IQ data block (IQ Data Block); Y represents the byte number that word comprises among the Basic Frame.The cycle of Basic Frame is T=1/3.84Mhz, and CPRI agreement regulation Basic Frame speed fc=1/T=3.84Mhz is the spreading rate of WCDMA, and IQ-data block wherein is used to carry wireless traffic IQ data (abbreviating " IQ data " as).
Antenna carrier container (Antenna xCarrier Container, abbreviate AxCContainer as) for the part of IQ-data block, may comprise a plurality of AxC Container among the IQ-data block, AxC Container is used to carry the IQ data of UTRA-FDD (WCDMA), WiMAX, E-UTRA (LTE), its size depends on the standard of being carried, 3 kinds of IQ mapping methods (Mapping Method) are provided in the agreement, also can be called mapping mode:
For other 2G, 3G standard, for example, global mobile communication (Global system forMobile Communication, abbreviate GSM as), CDMA, TDSCDMA etc., agreement does not provide support, in addition, for the method for multiple standard in same CPRI interface transmission, agreement does not provide support yet.
Summary of the invention
Do not support multiple standard to propose the present invention in the problem of same CRPI interface transmission at the CRPI agreement that exists in the correlation technique, for this reason, it is a kind of based on CPRI protocol of I Q data transmission scheme that main purpose of the present invention is to provide, to address the above problem.
To achieve these goals, according to an aspect of the present invention, provide inphase quadrature IQ data transmission method based on the common public radio interface CPRI agreement.
Inphase quadrature IQ data transmission method based on the common public radio interface CPRI agreement according to the present invention comprises: for one or more standards are determined the IQ mapping mode that every kind of standard adopts, and the information of the antenna carrier container A xC Container under the IQ mapping mode of definite every kind of standard correspondence and the parameter of this standard at the IQ of correspondence mapping mode; The IQ data block IQ Data Block of basic frame is divided, and the IQ Data Block after the division comprises: be used to carry the AxC Container of all standards part, be used to the antenna carrier vessel block AxC Container Block of wireless devices at different levels that the part of AxC ContainerBlock timing reference CI is provided; Radio equipment controller REC or wireless device RE send and/or recover the wireless traffic IQ data of this standard on the CPRI interface according to the IQ mapping mode of determining corresponding with standard.
Preferably, REC or RE send on the CPRI interface and/or recover the IQ data and comprise: for up link, at the CPRI of each RE transmit port, the cycle boundary of the AxCContainer Block of RE at different levels is a timing reference with 10 milliseconds of frame heads that recover from the CPRI receiving terminal of port of this locality; The CI of the CPRI receiving port higher level RE of the master port of RE at different levels or REC is a timing reference.
Preferably, REC or RE send on the CPRI interface and/or recover the IQ data and comprise: for down link, at the CPRI of REC transmitting terminal, the cycle boundary of the AxC Container Block of all AxC Container is a timing reference with 10 milliseconds of frame heads of CPRI transmitting terminal; Each RE is a timing reference with 10 milliseconds of frame heads that the CPRI receiving port from port recovers, and recovers the cycle boundary of AxC Container Block.
Preferably, sending the IQ data comprises: REC or RE begin the IQ data of one or more standards cycle boundary from AxC Container Block to the AxC Container mapping corresponding with this standard; Recovering the IQ data comprises: REC or RE are according to cycle boundary, the IQ transfer of data parameters needed of the AxCContainer Block that recovers, recover the IQ data of one or more standards from AxCContainer, wherein, IQ transfer of data parameters needed comprises: the parameter of the information of IQ Data Block dividing condition and the IQ mapping mode corresponding with standard.
Preferably, before sending on the CPRI interface and/or recovering the IQ data, said method also comprises at REC or RE: REC transmits IQ transfer of data parameters needed by the control and management channel to RE.
Preferably, the IQ Data Block of basic frame is divided, the IQ DataBlock after the division also comprises the reservation bit part.
To achieve these goals, according to a further aspect in the invention, also provide a kind of inphase quadrature IQ data transmission system based on the common public radio interface CPRI agreement.
According to the inphase quadrature IQ data transmission system based on the common public radio interface CPRI agreement of the present invention, comprise radio equipment controller REC, wireless device RE, this REC comprises: determination module, be used to one or more standards to determine the IQ mapping mode that every kind of standard adopts, and the information of the antenna carrier container A xC Container under the IQ mapping mode of definite every kind of standard correspondence and the parameter of this standard at the IQ of correspondence mapping mode; Divide module, be used for the IQ data block IQ Data Block of basic frame is divided, the IQ Data Block after the division comprises: be used to carry the AxC Container of all standards part, be used to the antenna carrier vessel block AxC Container Block of wireless devices at different levels that the part of AxC Container Block timing reference CI is provided; REC or wireless device send and/or recover the wireless traffic IQ data of this standard on the CPRI interface according to the IQ mapping mode of determining corresponding with standard.
Preferably, for up link, at the CPRI of each RE transmit port, the cycle boundary of the AxC Container Block of RE at different levels is a timing reference with 10 milliseconds of frame heads that recover from the CPRI receiving terminal of port of this locality; The CI of the CPRI receiving port higher level RE of the master port of RE at different levels or REC is a timing reference.
Preferably, for down link, at the CPRI of REC transmitting terminal, the cycle boundary of the AxC Container Block of all AxCContainer is a timing reference with 10 milliseconds of frame heads of CPRI transmitting terminal; Each RE is a timing reference with 10 milliseconds of frame heads that the CPRI receiving port from port recovers, and recovers the cycle boundary of AxC Container Block.
Preferably, at the CPRI transmitting terminal, REC or RE also are used for the IQ data of one or more standards cycle boundary from AxC Container Block is begun to the AxC Container mapping corresponding with this standard; At the CPRI receiving terminal, REC or RE also are used for cycle boundary, the IQ transfer of data parameters needed according to the AxC Container Block that recovers, recover the IQ data of one or more standards from AxC Container, wherein, IQ transfer of data parameters needed comprises: the parameter of the information of IQ Data Block dividing condition and the IQ mapping mode corresponding with standard.
By the present invention, adopted according to different standards and selected the IQ mapping method, and the IQ Data Block of basic frame marked be used to carry the part of AxC Container and the part that the timing reference of basic frame level is provided for the AxC Container Block of RE at different levels, solved the CRPI agreement that exists in the correlation technique and do not supported the problem of multiple standard in same CRPI interface transmission, and then make general-purpose interface be applicable to multi-modulation scheme wireless traffic IQ data, strengthened interface compatibility, flexibility.
Description of drawings
Accompanying drawing described herein is used to provide further understanding of the present invention, constitutes the application's a part, and illustrative examples of the present invention and explanation thereof are used to explain the present invention, do not constitute improper qualification of the present invention.In the accompanying drawings:
Fig. 1 is the schematic diagram according to the CPRI protocol architecture of correlation technique;
Fig. 2 is the schematic diagram according to the wireless frame structure of the CPRI agreement of correlation technique;
Fig. 3 is the schematic diagram according to the basic frame structure under the 1.2288G wire rate of the CPRI agreement of correlation technique;
Fig. 4 is the flow chart according to the IQ data transmission method of the embodiment of the invention;
Fig. 5 is the schematic diagram according to the AxC ContainerBlock of the Mapping Method 1 of the embodiment of the invention;
Fig. 6 is the division schematic diagram according to the IQ data block of the embodiment of the invention;
Fig. 7 is the system block diagram of using according to the two-stage RE cascade effect of the embodiment of the invention;
Fig. 8 is the timing method schematic diagram according to the descending AxC Container Block of the embodiment of the invention;
Fig. 9 is the timing method schematic diagram according to the up AxC Container Block of inventive embodiments;
Figure 10 is the AxCContainer Block schematic diagram according to the Mapping Method 3 of the embodiment of the invention;
Figure 11 is the AxCContainer Block schematic diagram according to the Mapping Method 2 of the embodiment of the invention.
Embodiment
Functional overview
It is a kind of based on CPRI protocol of I Q data transmission scheme that the embodiment of the invention provides, this scheme treatment principle is as follows: for one or more standards are determined the IQ mapping mode that every kind of standard adopts, and the information of the antenna carrier container A xC Container under the IQ mapping mode of definite every kind of standard correspondence and the parameter of this standard at the IQ of correspondence mapping mode; The IQ data block IQ Data Block of basic frame is divided, and the IQ Data Block after the division comprises: be used to carry the AxC Container of all standards part, be used to the antenna carrier vessel block AxC Container Block of wireless devices at different levels that the part of AxC ContainerBlock timing reference CI is provided; Radio equipment controller REC or wireless device RE send and/or recover the wireless traffic IQ data of this standard on the CPRI interface according to the IQ mapping mode of determining corresponding with standard.
Need to prove that under the situation of not conflicting, embodiment and the feature among the embodiment among the application can make up mutually.Describe the present invention below with reference to the accompanying drawings and in conjunction with the embodiments in detail.
In following examples, can in computer system, carry out in the step shown in the flow chart of accompanying drawing such as a set of computer-executable instructions, and, though there is shown logical order in flow process, but in some cases, can carry out step shown or that describe with the order that is different from herein.
According to embodiments of the invention, provide a kind of based on CPRI protocol of I Q data transmission method, Fig. 4 is the flow chart according to the IQ data transmission method of the embodiment of the invention, as shown in Figure 4, this method comprises that following step S402 is to step S406:
Step S402, for one or more standards are determined the IQ mapping mode that every kind of standard adopts, and the information of the antenna carrier container A xCContainer under the IQ mapping mode of definite every kind of standard correspondence and the parameter of this standard at the IQ of correspondence mapping mode;
In this step, can from Mapping Method 1～3, select a kind of method IQ mapping method according to practical situations, determine the big or small N of the AxC Container of certain RE, certain antenna carrier, certain standard
AxC, with and the relevant parameter of IQ mapping method.
Step S404, the IQ data block IQ Data Block of basic frame is divided, and the IQ Data Block after the division comprises: be used to carry the AxC Container of all standards part, be used to the antenna carrier vessel block AxC Container Block of wireless devices at different levels that the part of AxC Container Block timing reference CI is provided; Preferably, the IQ Data Block after the division also comprises the reservation bit part, is explained below.
In this step, can be according to practical situations, the IQ data block of basic frame is divided into 3 parts: part 1 is AxC Container#i (0＜=i＜=N, N are the IQ port number that is carried), and the bit number that AxC Container takies is N
AxCiPart 2 provides the timing reference (AxCContainer Block Chip Indication abbreviates CI as) of basic frame level for the AxC Container Block of RE at different levels, and this timing reference can be only effective to up basic frame, and taking bit number is N
CI(N
CIEqual the RE node number of cascade), for descending basic frame, this part can not take any bit; The 3rd part is a reservation bit, can give tacit consent to usefulness " 0 " and fill, and also can be used for the custom data passage according to concrete application.
Step S406, REC or RE send and/or recover the wireless traffic IQ data of this standard on the CPRI interface according to the IQ mapping mode of determining corresponding with standard.That is, REC or RE can send and recover the wireless traffic IQ signal of each standard of each RE according to selected mapping method on the CPRI interface.
Need to prove, REC can transmit needed relevant parameter to each RE by control and management Channel Transmission multi-standard IQ radio service data, and this parameter comprises the relevant configuration information of the multi-standard IQ mapping method of the information of IQ data block dividing condition of the basic frame of CPRI and each AxC Container.
Below the Mapping Method 1 to 3 that is adopted among the step S402 is described in detail.
Mapping?Method?1
This method is a kind of multi-standard IQ mapping method based on the IQ sampled data, can be applied to any wireless standard based on the IQ sampling rate, its objective is in order to make the IQ data be loaded into compactly in the CPRI frame as far as possible, thereby obtain higher bandwidth availability ratio, concrete grammar is described below:
Based on Mapping Method 1, the big or small N of the AxC Container that the IQ data are carried
AxC=2*ceil (M*fs/fc), wherein, function ceil returns " more than or equal to the smallest positive integral of expression formula ", and M represents the I of upstream or downstream of its wireless standard or the sampling bit wide of Q, and fs is the IQ sampling rate, and fc is the basic frame rate of CPRI.
Be called an AxC Container Block based on the continuous basic frame of K in 1, one AxC Container of Mapping Method, wherein, comprise S IQ sampled data and N
STIndividual filling bit, wherein, S, K satisfy expression formula S/fs=K/fc, and S and K calculate K=LCM (fs*fc)/fs by expression formula, and S=LCM (fs*fc)/fc, function LCM return " least common multiple of expression formula ", and wherein, filling bit is counted N
ST=K*NAxC-2*M*S, wherein, N
STIndividual filling bit can be used for transmission user self-defining data passage according to concrete applicable cases, and NST filling bit can be chosen among the AxCContainer Block forward position or by back location transmission.
Mapping?Method?2
This method is a kind of multi-standard IQ mapping method based on the IQ symbol period, can be used to have the IQ data-signal of symbol period, its objective is in order to make the symbol of IQ data be loaded into equably in the CPRI frame as far as possible, thereby obtain higher bandwidth availability ratio, concrete grammar is described below:
Based on Mapping Method 2, the big or small N of the AxC Container that the IQ data are carried
AxC〉=2*ceil (M*S/K), wherein K=T
F* fc, S=N
SYM* N
SAM=floor (T
F/ T
S) * N
SAMWherein, N
SYMBe the symbol numbers in the frame period, N
SAMBe the IQ sampling number in the symbol period, T
FBe the frame period, T
SBe symbol period, function f loor returns " smaller or equal to the maximum integer of expression formula ".
Comprise N based on 2, one AxC Container of Mapping Method Block
SYMIndividual AxC Symbol Block and NS_FRM filling bit, an AxC SymbolBlock comprises N
SAMIndividual IQ sampled data and N
S_SYMIndividual filling bit, wherein, N
S_SYM=floor ((K*N
AxC-2*M*S)/N
SYM), N
S_FRM=K*N
AxC-2*M*S-N
S_SYM* N
SYM, wherein, N
S_FRM, N
SYM* N
S_SYMIndividual filling bit can be used for transmission user self-defining data passage, N according to concrete applicable cases
S_FRMIndividual filling bit can be chosen among the AxC Container Block forward position or by back location transmission, N
S_SYMCan be chosen among the AxC Symbol Block forward position or by the back location transmission.
Mapping?Method?3
This method is the multi-standard IQ mapping method of a kind of compatible CPRI release 1/2, its objective is for compatible transmission multi-standard IQ data on the interface of existing C PRI release 1/2, and make the IQ sampled data be loaded into equably in the CPRI frame as far as possible.
Big or small N based on 3, one AxC Container of Mapping Method
AxC=2*M, the value of M is for behavior 8～20 down, for last behavior 4～20.
Transmit in an AxCContainer Group based on 3, one AxC Container of Mapping Method Block, an AxC Container Group comprises N
CIndividual AxCContainer, an AxC Container Block comprises an AxC Group and N
VIndividual infilled frame, an AxC Group comprises NA road AxC IQ sampled data, wherein, N
CFor satisfying N
C〉=ceil (N
A* smallest positive integral S/K), N
V=N
C* K-N
A* S, K=LCM (fs*fc)/fs, S=LCM (fs*fc)/fc.
N
VIndividual filling IQ sampled data at K*N
C(ki is from k0=0 to k=N for position ki among the individual AxC Container
C* K-1) by expression formula ki=floor (i*N
C* K/N
V) determine, wherein, N
V* 2*M filling bit can be special according to concrete applicable cases, can be used for transmission user self-defining data passage.
Can independently select the Mapping Method 1～3 described in the different step S402 at N AxC Container described in the step S404, but, require total bit number of 3 parts described in the step S404 can not surpass the IQ data block bit number of basic frame.
REC in step S406 or RE send the method with the wireless traffic IQ signal of each standard of recovering each RE on the CPRI interface, specifically describe as follows:
For down link, at the CPRI of REC transmitting terminal, the cycle boundary of the AxC Container Block of all AxC Container is a timing reference with the 10ms frame head of CPRI transmitting terminal, each RE receiving terminal is a timing reference with the 10ms frame head of the CPRI receiving port recovery of Slave Port, recovers the cycle boundary of AxC Container Block.
For up link, at the CPRI of each RE transmit port, the cycle boundary of the AxCContainer Block of RE at different levels think its separately the 10ms frame head that recovers of the CPRI receiving port of node Slave Port be timing reference, the CI of the equal higher level RE of CPRI receiving port of the Master Port of RE or REC is a timing reference.
At the CPRI transmitting terminal, REC or RE begin the IQ data of the different radio standard of the different RE cycle boundary from AxC Container Block toward AxCContainer mapping separately; At the CPRI receiving terminal, REC or RE transmit needed relevant parameter according to cycle boundary and the multi-standard IQ radio service data of the AxCContainer Block that recovers, recover the IQ data of the different radio standard of different RE from corresponding AxC Container.
Be described in detail below in conjunction with the implementation procedure of example the embodiment of the invention.
Example one
This example is CDMA, LTE (5Mhz bandwidth) the dual-transfer mode example under the 1.2288Gbps wire rate, adopts Mapping Method 1, and concrete implementation step is as follows:
Step 1A for the selected IQ mapping method of CDMA, LTE (5Mhz bandwidth) is Mapping Method 1, then, determines the big or small N of its AxC Container
AxC, with and the relevant parameter of IQ mapping method.
In this example, the IQ data relevant parameter of CDMA, LTE (5Mhz bandwidth) is as shown in table 1, wherein under the up 1.2288Mhz speed of the CPRI interface of CDMA, IQ data comprise 2 times of over-sampling IQ data and 2 receive diversity antenna datas, and its IQ data sampling bit wide M ' is 4.
Table 1
| Descending IQ data rate (Mhz) | Descending IQ data bit width (Bit) | Descending IQ over-sampling multiple | The down transmission diversity number | Up IQ data rate (Mhz) | Up IQ data bit width (Bit) | Up IQ over-sampling multiple | Up receive diversity number | |
| ??CDM??A | ??1.2288 | ??16 | ??1 | ??1 | ??1.2288 | ??16 | ??2 | ??2 |
| ??LTE??(5M) | ??7.68 | ??16 | ??1 | ??1 | ??7.68 | ??1 | ??1 | ??1 |
Table 2
| ??K | ??S | ??N AxC | ?? |
0/1 (by front/rear transmission) | |
| ??CDMA | ??25 | ??8 | ??12 | ??44 | ??0 |
| ??LTE??(5M) | ??1 | ??2 | ??64 | ??0 | ??0 |
Step 1B, Fig. 6 is the division schematic diagram according to the IQ data block of the embodiment of the invention, as shown in Figure 6, according to practical situations, the IQ data block of basic frame is divided into 3 parts, part 1 is AxC Container#i (0＜=i＜=N, N are the IQ port number that is carried), and the bit number that certain AxC takies is N
AxCiPart 2 be RE's at different levels " AxC Container Block " CI is provided, only effective to up basic frame, taking bit number is NCI (NCI equals the RE node number of cascade), for descending basic frame, this part does not take any bit; The 3rd part is a reservation bit, and acquiescence is filled with " 0 ", can be used for the custom data passage according to concrete application.
According to applicable cases, under the 1.2288Gbps wire rate, maximum demand is supported 8 grades of RE cascades, determines that relevant parameter is as shown in table 3.
Table 3
| The pattern configurations combination | CDMA AxC Container number | LTE (5M) AxC Container number | The total bit number of AxC Container | NCI (descending, up) | Reservation bit number (descending, up) |
| |
??8 | ??2 | ??224 | ??(0，8) | ??(16，8) |
| |
??14 | ??1 | ??232 | ??(0，8) | ??(8，0) |
Step 1C, REC or RE send and recover the wireless traffic IQ signal of CDMA, the LTE of each RE on the CPRI interface according to method selected among the Mapping Method 1～3.
Fig. 5 is the schematic diagram according to the AxC ContainerBlock of the Mapping Method 1 of the embodiment of the invention, Fig. 8 is the timing method schematic diagram according to the descending AxC ContainerBlock of the embodiment of the invention, as shown in Figure 8, the mapping of descending IQ data with recover to be rely on 10ms Radio Frame as timing reference.
Fig. 7 is the system block diagram of using according to the two-stage RE cascade effect of the embodiment of the invention, Fig. 9 is the timing method schematic diagram according to the up AxC Container Block of inventive embodiments, as shown in Figure 9, the mapping of up IQ data and the CI that recover to be relies on RE at different levels be as timing reference, and CI at different levels are that the 10ms RadioFrame that recovers of the Slave Port of RE is as timing reference.
Need to prove that in above-mentioned steps, REC can transmit needed relevant parameter to each RE by " control and management channel " transmission multi-standard IQ radio service data.
Example two
This example is CDMA, the WiMAX bimodulus application example at 1.2288Gbps, and CDMA adopts Mapping Method 3, and WiMAX adopts Mapping Method 2, specifically describes as follows:
Step 2A at first determines the IQ mapping method, and CDMA is chosen to be Mapping Method3, WiMAX and is chosen to be Mapping Method 2, determines the big or small NAxC of its AxC Container then, with and the relevant parameter of IQ mapping method.
In this example, the IQ data parameters of CDMA is as shown in table 4, and wherein, IQ data under the up 1.2288Mhz speed of CPRI interface comprise 2 times of over-sampling IQ data and 2 receive diversity antenna datas, and its IQ data sampling bit wide M ' is 4.
In this example, the IQ data parameters of WiMAX is as shown in table 5.
Table 4
| The CPRI interface parameters | Descending IQ data rate (Mhz) | Descending IQ data bit width (Bit) | Descending IQ over-sampling multiple | The down transmission diversity number | Up IQ data rate (Mhz) | Up IQ data bit width (Bit) | Up IQ over-sampling multiple | Up transmit diversity number |
| ??CDMA | ??1.2288 | ??16 | ??1 | ??1 | ??1.2288 | ??16 | ??2 | ??2 |
Table 5
| The WiMAX parameter | Parameter value |
| The FFT points N FFT | ??256 |
| Frame length T F | ??2ms |
| Signal bandwidth BW | ??5Mhz |
| Decimation factor n | ??144/125 |
| IQ sampling rate (not comprising CP) FS | ??Floor(n*BW/8000)*8000＝5.76Mhz |
| Symbol period T b | ??N FFT/F S＝40/9*1e-5 |
| CP factor G | ??1/4 |
| IQ symbol period (comprising CP) T S | ??(1+G)*T b＝5/9*1e-4 |
| The IQ bit wide (descending, up) of sampling | ??(15，15)bits |
CDMA adopts Mapping Method 3, and its IQ mapping relevant parameter is specifically as shown in table 6, and promptly the IQ data multiplex of NA=3 road CDMA transmits in NC=1 AxC Container, and empty number of frames is NV=1.Figure 10 is the AxC Container Block schematic diagram according to the MappingMethod 3 of the embodiment of the invention.
WiMAX adopts Mapping Method 2, and its IQ mapping relevant parameter is specifically as shown in table 7, and Figure 11 is the AxCContainer Block schematic diagram according to the Mapping Method 2 of the embodiment of the invention.
Table 6
| CDMA IQ mapping parameters (Mapping Method 3) | Parameter value |
| ??K | ??245760 |
| ??S | ??8 |
| ??N C | ??1 |
| ??N A | ??3 |
| ??N V | ??1 |
| Empty frame position K 0 | ??0 |
Table 7
| WiMAX IQ mapping parameters (Mapping Method 2) | Parameter value |
| ??M | ??15 |
| ??K | ??7680 |
| ??N SAM(comprising CP) | ??320 |
| ??N SYM(comprising CP) | ??36 |
| ??S | ??11520 |
| ??N AxC | ??46 |
| ??N S_SYM | ??213 |
| ??N S_FRM | ??12 |
| ??N S_SYMIndividual filling bit position | After leaning on |
| ??N S_FRMIndividual filling bit position | After leaning on |
Step 2B according to practical situations, is divided into 3 parts with the IQ data block of basic frame, and part 1 is AxC Container#i (0＜=i＜=N, N are the IQ port number that is carried), and the bit number that certain AxC takies is N
AxCiPart 2 be RE's at different levels " AxC Container Block " timing reference of basic frame level is provided, hereinafter referred is " CI " (AxC Container Block Chip Indication), only effective to up basic frame, taking bit number is NCI (NCI equals the RE node number of cascade), for by descending basic frame, this part does not take any bit; The 3rd part is a reservation bit, and acquiescence is filled with " 0 ", can be used for the custom data passage according to concrete application.
The NAxC that is calculated WiMAX by step 2A is 48, and the N of CDMA
AxCBe 32, under 1.2288Gbps, IQ Data Block is divided into 7 AxCContainer, N under the compatibility mode
AxCSize is 32.According to applicable cases, the configuration example of the IQ Data Block of this example is as shown in table 8:
Table 8
| The pattern configurations combination | The N of CDM A AxC | CDMA AxC Contain er number | The N of WiMAX AxC | WiMAX AxC Container number | The total bit number of AxC Container | ??N CI(descending, up) | Reservation bit number (descending, up) |
| |
??32 | ??6 | ??46 | ??1 | ??238 | ??(0，2) | ??(2，0) |
| |
??32 | ??4 | ??46 | ??2 | ??220 | ??(0，8) | ??(20，??12) |
| |
??32 | ??3 | ??46 | ??3 | ??234 | ??(0，6) | ??(6，0) |
| |
??32 | ??1 | ??46 | ??4 | ??216 | ??(0，8) | ??(24，??16) |
Step 2C, REC or RE send and recover the wireless traffic IQ signal of CDMA, the WiMAX of each RE on the CPRI interface according to method selected among the Mapping Method 1～3.
The method that descending, the up AxC Container Block of each standard IQ mapping regularly recovers is similar to example one, does not repeat them here.
Need to prove that in above-mentioned steps, REC can transmit needed relevant parameter to each RE by " control and management channel " transmission multi-standard IQ radio service data.
According to embodiments of the invention, also provide a kind of based on CPRI protocol of I Q data transmission system, this system is used for using the method for the above embodiments, comprise radio equipment controller REC, wireless device RE, wherein, REC comprises: determination module, be used to one or more standards to determine the IQ mapping mode that every kind of standard adopts, and the information of the antenna carrier container A xC Container under the IQ mapping mode of definite every kind of standard correspondence and the parameter of this standard at the IQ of correspondence mapping mode; Divide module, be used for the IQ data block IQ Data Block of basic frame is divided, the IQ Data Block after the division comprises: be used to carry the AxC Container of all standards part, be used to the antenna carrier vessel block AxC Container Block of wireless devices at different levels that the part of AxC Container Block timing reference CI is provided; REC or wireless device send and/or recover the wireless traffic IQ data of this standard on the CPRI interface according to the IQ mapping mode of determining corresponding with standard.
In this system, for up link, at the CPRI of each RE transmit port, the cycle boundary of the AxC Container Block of RE at different levels is a timing reference with 10 milliseconds of frame heads that recover from the CPRI receiving terminal of port of this locality; The CI of the CPRI receiving port higher level RE of the master port of RE at different levels or REC is a timing reference.
For down link, at the CPRI of REC transmitting terminal, the cycle boundary of the AxC Container Block of all AxC Container is a timing reference with 10 milliseconds of frame heads of CPRI transmitting terminal; Each RE is a timing reference with 10 milliseconds of frame heads that the CPRI receiving port from port recovers, and recovers the cycle boundary of AxC Container Block.
In this system, at the CPRI transmitting terminal, REC or RE also are used for the IQ data of one or more standards cycle boundary from AxC Container Block is begun to the AxC Container mapping corresponding with this standard; At the CPRI receiving terminal, REC or RE also are used for cycle boundary, the IQ transfer of data parameters needed according to the AxC Container Block that recovers, recover the IQ data of one or more standards from AxC Container, wherein, IQ transfer of data parameters needed comprises: the parameter of the information of IQ Data Block dividing condition and the IQ mapping mode corresponding with standard.
In sum, by the above embodiment of the present invention, reached following effect:
The first, by expanded application, make general-purpose interface be applicable to multi-modulation scheme wireless traffic IQ data to the CPRI4.0 standard agreement, strengthened interface compatibility, flexibility.
The second, multi-standard IQ data mapping method helps the compatibility upgrading of CPRI interface based on 3 kinds of IQ mapping methods that CPRI4.0 provides.
The 3rd, with CI timing reference at up link RE at different levels, carry out the IQ data map, particularly under the situation of chain networking, can simplify the CPRI interface of up link and handle.
Obviously, those skilled in the art should be understood that, above-mentioned each module of the present invention or each step can realize with the general calculation device, they can concentrate on the single calculation element, perhaps be distributed on the network that a plurality of calculation element forms, alternatively, they can be realized with the executable program code of calculation element, thereby, they can be stored in the storage device and carry out by calculation element, perhaps they are made into each integrated circuit modules respectively, perhaps a plurality of modules in them or step are made into the single integrated circuit module and realize.Like this, the present invention is not restricted to any specific hardware and software combination.
The above is the preferred embodiments of the present invention only, is not limited to the present invention, and for a person skilled in the art, the present invention can have various changes and variation.Within the spirit and principles in the present invention all, any modification of being done, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (10)
1. the inphase quadrature IQ data transmission method based on the common public radio interface CPRI agreement is characterized in that, comprising:
For one or more standards are determined the IQ mapping mode that every kind of standard adopts, and the information of the antenna carrier container A xCContainer under the IQ mapping mode of definite every kind of standard correspondence and the parameter of this standard at the IQ of correspondence mapping mode;
The IQ data block IQ Data Block of basic frame is divided, and the IQ Data Block after the division comprises: be used to carry the AxC Container of all standards part, be used to the antenna carrier vessel block AxC ContainerBlock of wireless devices at different levels that the part of AxC Container Block timing reference CI is provided;
Radio equipment controller REC or wireless device RE send and/or recover the wireless traffic IQ data of this standard on the CPRI interface according to the IQ mapping mode of determining corresponding with standard.
2. method according to claim 1 is characterized in that, described REC or described RE send on described CPRI interface and/or recover described IQ data and comprise:
For up link, at the CPRI of each RE transmit port, the cycle boundary of the AxC Container Block of RE at different levels is a timing reference with 10 milliseconds of frame heads that recover from the CPRI receiving terminal of port of this locality; The CI of the CPRI receiving port higher level RE of the master port of described RE at different levels or described REC is a timing reference.
3. method according to claim 1 is characterized in that, described REC or described RE send on described CPRI interface and/or recover described IQ data and comprise:
For down link, at the CPRI of described REC transmitting terminal, the cycle boundary of the AxC Container Block of all AxCContainer is a timing reference with 10 milliseconds of frame heads of described CPRI transmitting terminal; Each RE is a timing reference with 10 milliseconds of frame heads that the CPRI receiving port from port recovers, and recovers the cycle boundary of described AxCContainer Block.
4. according to claim 2 or 3 described methods, it is characterized in that,
Sending described IQ data comprises: described REC or described RE begin the IQ data of described one or more standards cycle boundary from AxC Container Block to the AxC Container mapping corresponding with this standard;
Recovering described IQ data comprises: described REC or described RE are according to cycle boundary, the IQ transfer of data parameters needed of the AxC Container Block that recovers, recover the IQ data of described one or more standards from AxC Container, wherein, described IQ transfer of data parameters needed comprises: the parameter of the information of described IQ Data Block dividing condition and the IQ mapping mode corresponding with standard.
5. method according to claim 4 is characterized in that, before sending on the described CPRI interface and/or recovering described IQ data, described method also comprises at described REC or described RE:
Described REC transmits described IQ transfer of data parameters needed by the control and management channel to described RE.
6. according to each described method in the claim 1 to 3, it is characterized in that the IQ Data Block of basic frame is divided, and the IQ Data Block after the division also comprises the reservation bit part.
7. the inphase quadrature IQ data transmission system based on the common public radio interface CPRI agreement comprises radio equipment controller REC, wireless device RE, it is characterized in that,
Described REC comprises: determination module, be used to one or more standards to determine the IQ mapping mode that every kind of standard adopts, and the information of the antenna carrier container A xC Container under the IQ mapping mode of definite every kind of standard correspondence and the parameter of this standard at the IQ of correspondence mapping mode; Divide module, be used for the IQ data block IQ Data Block of basic frame is divided, the IQ Data Block after the division comprises: be used to carry the AxC Container of all standards part, be used to the antenna carrier vessel block AxC Container Block of wireless devices at different levels that the part of AxC ContainerBlock timing reference CI is provided;
Described REC or described wireless device send and/or recover the wireless traffic IQ data of this standard on the CPRI interface according to the IQ mapping mode of determining corresponding with standard.
8. system according to claim 7 is characterized in that,
For up link, at the CPRI of each described RE transmit port, the cycle boundary of the AxC Container Block of RE at different levels is a timing reference with 10 milliseconds of frame heads that recover from the CPRI receiving terminal of port of this locality; The CI of the CPRI receiving port higher level RE of the master port of described RE at different levels or described REC is a timing reference.
9. system according to claim 7 is characterized in that,
For down link, at the CPRI of described REC transmitting terminal, the cycle boundary of the AxC Container Block of all AxCContainer is a timing reference with 10 milliseconds of frame heads of described CPRI transmitting terminal; Each RE is a timing reference with 10 milliseconds of frame heads that the CPRI receiving port from port recovers, and recovers the cycle boundary of described AxCContainer Block.
10. according to Claim 8 or 9 described systems, it is characterized in that,
At the CPRI transmitting terminal, described REC or described RE also are used for the IQ data of described one or more standards cycle boundary from AxC Container Block is begun to the AxC Container mapping corresponding with this standard;
At the CPRI receiving terminal, described REC or described RE also are used for cycle boundary, the IQ transfer of data parameters needed according to the AxC Container Block that recovers, recover the IQ data of described one or more standards from AxC Container, wherein, described IQ transfer of data parameters needed comprises: the parameter of the information of described IQ Data Block dividing condition and the IQ mapping mode corresponding with standard.
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| PCT/CN2010/074314 WO2011038597A1 (en) | 2009-09-29 | 2010-06-23 | Method and system for transmitting in-phase quadrature data |
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