CN106487492A - A kind of data mapping method, device and equipment - Google Patents
A kind of data mapping method, device and equipment Download PDFInfo
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- CN106487492A CN106487492A CN201610876918.1A CN201610876918A CN106487492A CN 106487492 A CN106487492 A CN 106487492A CN 201610876918 A CN201610876918 A CN 201610876918A CN 106487492 A CN106487492 A CN 106487492A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/0001—Arrangements for dividing the transmission path
- H04L5/0003—Two-dimensional division
- H04L5/0005—Time-frequency
- H04L5/0007—Time-frequency the frequencies being orthogonal, e.g. OFDM(A), DMT
- H04L5/0008—Wavelet-division
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/0001—Arrangements for dividing the transmission path
- H04L5/0003—Two-dimensional division
- H04L5/0005—Time-frequency
- H04L5/0007—Time-frequency the frequencies being orthogonal, e.g. OFDM(A), DMT
- H04L5/001—Time-frequency the frequencies being orthogonal, e.g. OFDM(A), DMT the frequencies being arranged in component carriers
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Abstract
The embodiment of the invention discloses a kind of data mapping method, device and equipment are it is achieved that can transmit the data mapping method of arrowband I/Q data on the premise of not changing CPRI.Wherein said method includes：Obtain IQ sampling rate f of arrowbands', frequency f in broadbandsfAnd antenna carrier quantity N' of arrowbandA, the frequency in described broadband is the inverse of timeslice, and timeslice refers to the time cycle specified in the standard agreement of broadband；IQ sampling rate f using arrowbands' and broadband frequency fsfObtain number S' of each narrow-band antenna carrier wave corresponding arrowband IQ sampled point, and N'ANumber K' of the timeslice in broadband that the arrowband IQ sampled point of individual antenna carrier can be mapped to；N' by arrowbandAThe arrowband IQ sampled point of individual antenna carrier is mapped in the K' timeslice in broadband；In units of K' timeslice after mapping, the IQ sampled point of arrowband is mapped in the basic frame of common public radio interface, with the mapping completing to arrowband IQ sampled point in common public radio interface.
Description
Technical field
The present invention relates to the communications field, more particularly, to a kind of data mapping method, device and equipment.
Background technology
This part is it is intended that the embodiments of the present invention stated in claims provide background or context.Herein
Description is not because include just recognizing to be prior art in this part.
With the continuous progress of mobile communication technology, the network architecture of radio communication also in continuous evolution forward, with base band
Unit (Base Band Unit, BBU) and long-distance radio frequency unit (Remote Radio Unit, RRU) are separated into principal character
Base station system has become as the Main Morphology of public network base station (especially LTE base station).It is in distributed radio system at the two,
Common public radio interface (Common Public Radio Interface, CPRI) is the wireless of described Base Band Unit place
Equipment control centre (Radio Equipment Control, REC), the wireless device being located with described long-distance radio frequency unit
The standard interface interacting between (Radio Equipment, RE).Because CPRI has standardization, transfer rate height, postpones
The feature such as little, thus become the common interfaces of REC and RE in public network base station, the host-host protocol of interface is referred to as CPRI agreement.Fig. 1 is
The basic configuration figure of CPRI, except REC and RE, CPRI system also includes CPRI link.Fig. 2 is the hierarchy of CPRI agreement
Figure, this illustrates CPRI agreement and is divided into two-layer：Physical layer data link layer.Generally, the digital baseband modulation between REC and RE
Signal passes through the data flow of two components in the same direction/orthogonal (in-phase/Quadrature-phase, IQ) in data link layer
(abbreviation I/Q data) passage is transmitted.If REC transmits I/Q data to RE, then REC is referred to as transmission side data, and RE is referred to as data
Recipient；If RE transmits I/Q data to REC, then RE is referred to as transmission side data, and REC is referred to as data receiver.No matter which is
Side is transmission side data, and which side is data receiver, before I/Q data is transmitted, is required for carrying out I/Q data reflecting
Penetrate, its object is to so that I/Q data is transmitted according to the transmission requirement of CPRI.
Three kinds of I/Q data mapping methods are proposed in existing CPRI agreement：Based on IQ sampled point (IQ sample
Based), it is based on symbol (symbol based) and back compatible (backward compatible).Wherein the third I/Q data
Mapping basic ideas be：N by broadbandAIQ sampled point (the IQ of individual antenna carrier (Antenna-carrier, abbreviation AxC)
Samples) in K basic frame, each AxC has identical characteristic (bit wide, sampling rate all same) for uniform distribution, and
Each AxC corresponds to S IQ sampled point respectively.Basic frame is the ultimate unit of CPRI transmission, NAS IQ sampled point is corresponding
Time is identical with the time of K basic frame.One basic frame one AxC container (AxC Container) of correspondence, therefore one
Size N of AxC containerCNeed to meet and at least can carryThe condition of individual sampled point.If NAS IQ sampled point be not K
AxC container in individual basic frame fills up, and in AxC container, remaining capacity is filled by invalid sampled point.S and K is given in agreement
Calculation, that is,：
Wherein, fsFor the sampling rate of I/Q data, fcFor the basic frame rate of CPRI, it is fixed as 3.84MHz, LCM is to calculate
The function of little common multiple.
From arrowband to broadband evolution, traditional narrowband systems (PDT, DMR, Tetra etc.) also exist current cluster private network
Using integral type base station architecture, the framework that is, BBU and RRU is integrated, but during evolution, BBU must be adopted
The detached framework with RRU, therefore relates to data transmission problems in CPRI for the narrow band data.And the CPRI interface protocol of public network
Cannot be used directly in cluster private network, because in number K of the corresponding basic frame of S IQ sampled point of calculating, arrowband meter
The numerical value obtaining will be significantly larger than the calculated numerical value in broadband.And under public network standard, the configuration to mapping parameters K is usual
Less (for example within 50), so that existing CPRI cannot transmit the I/Q data of arrowband, and adapts to existing CPRI
The I/Q data transmission of arrowband is it is necessary to carry out larger change in configuration, very inconvenient.
So, need that a kind of data mapping that can transmit arrowband I/Q data on the premise of not changing CPRI occurs at present
Method.
Content of the invention
In order to solve the technical problem of prior art presence, the present invention provides a kind of data mapping method, device and equipment,
Achieve the purpose that can transmit arrowband I/Q data on the premise of not changing CPRI.
Embodiments provide a kind of data mapping method, methods described includes：
Obtain IQ sampling rate f of arrowbands', frequency f in broadbandsfAnd antenna carrier quantity N' of arrowbandA, described width
The frequency of band is the inverse of timeslice, and described timeslice refers to the time cycle specified in the standard agreement of broadband；
IQ sampling rate f using described arrowbands' and described broadband frequency fsfObtain each narrow-band antenna carrier wave to correspond to
Arrowband IQ sampled point number S', and N'AThe time in the broadband that the arrowband IQ sampled point of individual antenna carrier can be mapped to
Number K' of piece；
N' by arrowbandAThe arrowband IQ sampled point of individual antenna carrier is mapped in the K' timeslice in broadband, wherein, K'
The arrowband IQ sampling number that timeslice can accommodate is more than or equal to described N'AThe arrowband IQ sampled point quantity of individual antenna carrier；
In units of K' timeslice after mapping, the IQ sampled point of arrowband is mapped to the base of common public radio interface
In this frame, with the mapping completing to arrowband IQ sampled point in common public radio interface.
Preferably, using IQ sampling rate f of described arrowbands' and described broadband frequency fsf, obtained by equation below
Number S' of each narrow-band antenna carrier wave corresponding arrowband IQ sampled point：
Wherein, described LCM is the function calculating least common multiple.
Preferably, using IQ sampling rate f of described arrowbands' and described broadband frequency fsf, obtained by equation below
N'ANumber K' of the timeslice in broadband that the arrowband IQ sampled point of individual antenna carrier can be mapped to：
Wherein, described LCM is the function calculating least common multiple.
Preferably, described broadband is LTE standard, and described timeslice is subframe；
The arrowband IQ sampling number that described K' timeslice can accommodate obtains according to the sampling number of the OFDM symbol of LTE
Arrive.
Preferably, the arrowband IQ sampling number that described K' timeslice can accommodate is according to the sampling of the OFDM symbol of LTE
Points are specially：
The sampling number that each LTE subframe can accommodate is obtained according to the sampling number of OFDM symbol；
The sampling number that K' subframe can accommodate is obtained according to the sampling number that each subframe can accommodate.
Preferably, the described sampling number according to OFDM symbol obtains the sampling number tool that each LTE subframe can accommodate
Body is：
Ntti=15 Nsymbol
Wherein, described NsymbolThe sampling number of the OFDM symbol for LTE, described NttiCan accommodate for each LTE subframe
Sampling number.
Preferably, if the arrowband IQ sampling number that K' timeslice can accommodate is more than described N'AIndividual antenna carrier narrow
Carry IQ sampled point quantity, then methods described also includes：
Sampled point capacity remaining in K' timeslice is filled with invalid IQ sampled point, remaining in described K' timeslice
The arrowband IQ sampling number that can accommodate for K' timeslice of sampled point capacity and described N'AThe arrowband IQ of individual antenna carrier adopts
The difference of sampling point quantity.
The embodiment of the present invention also provides a kind of data mapping unit, and described device includes：
Parameter acquiring unit, parameter calculation unit, arrowband map unit and broadband map unit；
Described parameter acquiring unit, for obtaining IQ sampling rate f of arrowbands', frequency f in broadbandsfAnd the sky of arrowband
Line number of carrier wave N'A, the frequency in described broadband is the inverse of timeslice, and described timeslice refers to specified in the standard agreement of broadband
Time cycle；
Described parameter calculation unit, for IQ sampling rate f using described arrowbands' and described broadband frequency fsf?
To number S' of each narrow-band antenna carrier wave corresponding arrowband IQ sampled point, and N'AThe arrowband IQ sampled point of individual antenna carrier
Number K' of the timeslice in the broadband that can be mapped to；
Described arrowband map unit, for by the N' of arrowbandAThe arrowband IQ sampled point of individual antenna carrier is mapped to broadband
In K' timeslice, wherein, the arrowband IQ sampling number that K' timeslice can accommodate is more than or equal to described N'AIndividual antenna carries
The arrowband IQ sampled point quantity of ripple；
Described broadband map unit, in units of K' timeslice after mapping, by the IQ sampled point mapping of arrowband
To in the basic frame of common public radio interface, with the mapping completing to arrowband IQ sampled point in common public radio interface.
Preferably, if the arrowband IQ sampling number that K' timeslice can accommodate is more than described N'AIndividual antenna carrier narrow
Carry IQ sampled point quantity, then described device also includes：
Fills unit, for sampled point capacity remaining in K' timeslice is filled with invalid IQ sampled point, described K'
The arrowband IQ sampling number that in individual timeslice, remaining sampled point capacity can accommodate for K' timeslice and described N'AIndividual antenna
The difference of the arrowband IQ sampled point quantity of carrier wave.
Present invention also offers a kind of data mapping device, described equipment includes：
Processor；
For storing the memorizer of described processor executable；
Wherein, described processor is configured to：
Obtain IQ sampling rate f of arrowbands', frequency f in broadbandsfAnd antenna carrier quantity N' of arrowbandA, described width
The frequency of band is the inverse of timeslice, and described timeslice refers to the time cycle specified in the standard agreement of broadband；
IQ sampling rate f using described arrowbands' and described broadband frequency fsfObtain each narrow-band antenna carrier wave to correspond to
Arrowband IQ sampled point number S', and N'AThe time in the broadband that the arrowband IQ sampled point of individual antenna carrier can be mapped to
Number K' of piece；
N' by arrowbandAThe arrowband IQ sampled point of individual antenna carrier is mapped in the K' timeslice in broadband, wherein, K'
The arrowband IQ sampling number that timeslice can accommodate is more than or equal to described N'AThe arrowband IQ sampled point quantity of individual antenna carrier；
In units of K' timeslice after mapping, the IQ sampled point of arrowband is mapped to the base of common public radio interface
In this frame, with the mapping completing to arrowband IQ sampled point in common public radio interface.
The present invention passes through to obtain IQ sampling rate f of arrowbands', frequency f in broadbandsfAnd the antenna carrier quantity of arrowband
N'A, and IQ sampling rate f using described arrowbands' and described broadband frequency fsfObtain each narrow-band antenna carrier wave corresponding
Number S' of arrowband IQ sampled point, and N'AThe timeslice in the broadband that the arrowband IQ sampled point of individual antenna carrier can be mapped to
Number K', by the N' of arrowbandAThe arrowband IQ sampled point of individual antenna carrier be mapped in the K' timeslice in broadband it is achieved that
Arrowband I/Q data is mapped to the purpose of broadband I/Q data, then in units of K' timeslice after mapping, by the IQ of arrowband
Sampled point is mapped in the basic frame of common public radio interface, to complete to arrowband IQ sampled point in common public radio interface
In mapping.Change the transmission that just can realize to arrowband I/Q data because the present embodiment need not do to existing CPRI, therefore
Improve adaptability and the utilization rate of existing CPRI.
Brief description
In order to be illustrated more clearly that the embodiment of the present application or technical scheme of the prior art, below will be to embodiment or existing
Have technology description in required use accompanying drawing be briefly described it should be apparent that, drawings in the following description be only this
Some embodiments described in application, for those of ordinary skill in the art, on the premise of not paying creative work,
Other accompanying drawings can also be obtained according to these accompanying drawings.
Fig. 1 is the basic configuration figure of CPRI；
Fig. 2 is the hierarchical diagram of CPRI agreement；
A kind of flow chart of data mapping method that Fig. 3 provides for the embodiment of the present invention one；
The schematic diagram of PDT standard frame structure in a kind of data mapping method that Fig. 4 provides for the embodiment of the present invention two；
The baseband modulation process schematic of PDT in a kind of data mapping method that Fig. 5 provides for the embodiment of the present invention two；
The IQ sampled point of PDT and described invalid IQ in a kind of data mapping method that Fig. 6 provides for the embodiment of the present invention two
Sampled point is filled in the one way in which in LTE subframe；
LTE days of wide and narrow strip data compatibility transmission in a kind of data mapping method that Fig. 7 provides for the embodiment of the present invention two
Line carrier multiplexing schematic diagram；
A kind of structured flowchart of data mapping unit that Fig. 8 provides for the embodiment of the present invention three；
A kind of structured flowchart of data mapping device that Fig. 9 provides for the embodiment of the present invention four.
Specific embodiment
The CPRI agreement of prior art gives broadband-based I/Q data mapping method, and its basic thought is：By broadband
NAThe uniform distribution of the IQ sampled point (IQ samples) of individual antenna carrier (Antenna-carrier, abbreviation AxC) is at K
In basic frame, and give each AxC number S of corresponding IQ sampled point, and NAIndividual antenna carrier (Antenna-
Carrier, abbreviation AxC) corresponding basic frame number K of IQ sampled point computing formula.In general, broadband-based IQ number
Only have unitss according to transmitting calculated basic frame number K, and if being directly applied to the I/Q data of arrowband is reflected by this formula
Penetrate, then number K of calculated basic frame will be significantly larger than broadband-based I/Q data and transmit calculated basic frame
Number.
Give an example it is assumed that sampling rate f of the I/Q data in broadbands=30.72MHz, due to fcFor definite value 3.84MHz, because
This has LCM (fs,fc)=30.72MHz, and then can obtain:
The sampling rate of the I/Q data of hypothesis arrowband is fs=38.4KHz=3.84 × 10-2MHz, due to fcFor definite value
3.84MHz, therefore has LCM (fs,fc)=3.84MHz, and then can obtain：
The K value of the K value of visible transmission arrowband I/Q data and transmission broadband I/Q data differs greatly, and existing CPRI is inapplicable
Transmission in arrowband I/Q data.
In order to overcome this technical problem, inventors herein propose a kind of data mapping method, its basic ideas is：First will
The N' of arrowbandAThe corresponding IQ sampled point of individual antenna carrier is mapped in the K' timeslice in broadband, then again with the K' after mapping
Individual timeslice is unit, and the IQ sampled point of arrowband is mapped in the basic frame of common public radio interface.That is, first will
The IQ sampled point " packaging " of arrowband becomes the IQ sampled point in broadband, then utilizes the mapping side to broadband IQ sampled point in prior art
Method is mapped, and thus can continue transmission using existing CPRI to arrowband I/Q data, improve the adaptation of existing CPRI
Property and utilization rate.
In order that those skilled in the art more fully understand the present invention program, below in conjunction with the embodiment of the present invention
Accompanying drawing, is clearly and completely described to the technical scheme in the embodiment of the present invention it is clear that described embodiment is only this
Invent a part of embodiment, rather than whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art exist
The every other embodiment being obtained under the premise of not making creative work, broadly falls into the scope of protection of the invention.
Embodiment one：
Referring to Fig. 3, this figure is a kind of flow chart of data mapping method embodiment one that the present invention provides.
The data mapping method that the present embodiment provides comprises the steps：
Step S101：Obtain IQ sampling rate f of arrowbands', frequency f in broadbandsfAnd the antenna carrier quantity of arrowband
N'A.
The frequency in described broadband is the inverse of timeslice, and described timeslice refers to week time specified in the standard agreement of broadband
Phase, such as subframe, time slot, radio frames, OFDM (Orthogonal Frequency Division Multiplexing, orthogonal
Frequency division multiplexing) symbol etc..
Step S102：IQ sampling rate f using described arrowbands' and described broadband frequency fsfObtain each arrowband sky
Number S' of line carrier wave corresponding arrowband IQ sampled point, and N'AThe arrowband IQ sampled point of individual antenna carrier can be mapped to
Number K' of the timeslice in broadband.
In the present embodiment, number S' of each narrow-band antenna carrier wave corresponding arrowband IQ sampled point described can be by such as
Lower formula obtains：
Wherein, described LCM is the function calculating least common multiple.
Described N'ANumber K' of the timeslice in broadband that the arrowband IQ sampled point of individual antenna carrier can be mapped to can be led to
Cross equation below to obtain：
Wherein, described LCM is the function calculating least common multiple.
It should be noted that above-mentioned two formula does not constitute limitation of the invention, those skilled in the art can root
Combine practical application request designed, designed according to the technological thought that the present invention provides.
Step S103：N' by arrowbandAThe arrowband IQ sampled point of individual antenna carrier is mapped in the K' timeslice in broadband.
In order to realize the mapping to arrowband I/Q data, need to meet the arrowband IQ sampling that K' timeslice can accommodate
Points are more than or equal to described N'AThe arrowband IQ sampled point quantity of individual antenna carrier.
In actual applications, if the arrowband IQ sampling number that K' timeslice can accommodate is more than described N'AIndividual antenna carries
The arrowband IQ sampled point quantity of ripple, then can be filled sampled point capacity remaining in K' timeslice with invalid IQ sampled point,
The arrowband IQ sampling number that in described K' timeslice, remaining sampled point capacity can accommodate for K' timeslice and described N'A
The difference of the arrowband IQ sampled point quantity of individual antenna carrier.
Step S104：In units of K' timeslice after mapping, the IQ sampled point of arrowband is mapped to general public nothing
In the basic frame of line interface, with the mapping completing to arrowband IQ sampled point in common public radio interface.
The IQ sampled point of arrowband is mapped to the K' timeslice in broadband by the present embodiment, is equivalent to the I/Q data of arrowband
The I/Q data in " being changed into " broadband, thus in the mapped, it is possible to use the method to the mapping of broadband I/Q data in prior art, will take
Broadband I/Q data with arrowband IQ sampled point is mapped in the basic frame of CPRI.
The present embodiment passes through to obtain IQ sampling rate f of arrowbands', frequency f in broadbandsfAnd the antenna carrier number of arrowband
Amount N'A, and IQ sampling rate f using described arrowbands' and described broadband frequency fsfObtain each narrow-band antenna carrier wave to correspond to
Arrowband IQ sampled point number S', and N'AThe time in the broadband that the arrowband IQ sampled point of individual antenna carrier can be mapped to
Number K' of piece, by the N' of arrowbandAThe arrowband IQ sampled point of individual antenna carrier is mapped in the K' timeslice in broadband, realizes
Arrowband I/Q data is mapped to the purpose of broadband I/Q data, then in units of K' timeslice after mapping, by arrowband
IQ sampled point is mapped in the basic frame of common public radio interface, to complete arrowband IQ sampled point is connect in general public wireless
Mapping in mouthful.Change the transmission that just can realize to arrowband I/Q data because the present embodiment need not do to existing CPRI, because
This adaptability that improve existing CPRI and utilization rate.
Embodiment two
The present embodiment by introducing the data mapping method of present invention offer with reference to practical application scene.In this embodiment
In, described arrowband is PDT (Police Digital Trunking or Public Digital Trunking, police set of digits
Group's system or public number cluster) standard, described broadband is LTE (Long Term Evolution, Long Term Evolution) standard, this
Embodiment not only will realize the transmission of the I/Q data to PDT standard, but also will realize the I/Q data of PDT standard and described LTE
The compatible transmission of the I/Q data of standard.
In order to be better understood from the data mapping method of the present embodiment offer, introduce the frame of PDT cluster standard first
Form and I/Q data form.Referring to Fig. 4, this figure is the frame structure of PDT standard, in this frame structure, when 60ms is divided into 2
Gap, each slot length is 30ms.One time slot is made up of three branches：Synchronous or embedded signaling, voice or data and CACH
(descending) or protection interval (up).Each frame data include 144 OFDM symbol, and character rate is 4800Hz, due to being to adopt
With 4FSK (Frequency-shift keying, frequency shift keying) modulation, each time slot carrying 288bit bit valid data.
Shown in baseband modulation process Fig. 5 of PDT, first every 2 bit datas are mapped to modulation symbol, then to modulation
Symbol is up-sampled and shaping filter, after through enter frequency modulation(PFM) generate baseband signal.After ovennodulation, I/Q data is in symbol
Carried out the up-sampling of certain multiple on speed.In this enforcement sample taking 8 sampling rates as a example, i.e. fs'=8 × 4800Hz=
The IQ sampling rate of 38400Hz, certainly in practice can also be using other sampling rates.Moreover, it is assumed that the antenna carrier number of PDT
Amount N'A=4.
Using LTE subframe as timeslice, each subframe time length is 1ms to the present embodiment, therefore frequency f of subframesfFor
1000Hz (inverse of single subframe time length).To the IQ sampled point of 4 antenna carrier of PDT be loaded K' of LTE
It is transmitted in subframe, then it suffices that following condition：
Wherein, each antenna carrier of PDT corresponds to S' IQ sampled point.
Because S' and K' can only round numbers it is therefore desirable to f by decimals' processed, that is, calculating fs' and fsf
Least common multiple when, by fs' be multiplied by 10, corresponding it is also desirable to by fsfIt is multiplied by 10.
S' and K' can be obtained by equation below：
Wherein, LCM is to calculate both least common multiples.
In order to be able to the IQ sampled point in the 4 of PDT antenna carrier is mapped in 5 subframes of LTE, need to ensure this 5
The IQ sampled point of the PDT that individual subframe can accommodate is more than or equal to the IQ sampled point in this four antenna carrier.Due to each PDT
Antenna carrier correspond to 384 IQ sampled points, then 4 antenna carrier have corresponding 192 × 4=768 IQ sampled points altogether, thus
Need to ensure that 5 subframes can accommodate minimum 768 IQ sampled points.
The sampling number of the PDT that LTE subframe can accommodate can obtain according to the sampling number of the OFDM symbol of LTE, and
The sampling number of the OFDM symbol of LTE can be tabled look-up according to the bandwidth of LTE and be obtained.Assume a width of 20MHz of band of described LTE, that
The sampled point N of OFDM symbol corresponding with described bandwidth can be found according to table 1symbolFor 2048.
Table 1
| Bandwidth (MHz) | 1.4 | 3 | 5 | 10 | 15 | 20 |
| Nsymbol | 128 | 256 | 512 | 1024 | 1536 or 2048 | 2048 |
The sampling number N that one LTE subframe can accommodatettiObtained according to equation below：
Ntti=15 Nsymbol=15 × 2048=30720
So, the sampling number N that in the present embodiment, K' subframe can accommodateg-gapObtained according to equation below：
Ng-gap=K'Ntti=5 × 30720=153600
Through calculating, in the present embodiment, the quantity (768) of the corresponding IQ sampled point of four antenna carrier of PDT is much little
The sampling number N that can accommodate in 5 LTE subframesg-gap(153600), therefore can realize IQ sampled point and LTE of PDT
Mapping between frame.
Further, it is also possible to verify by another mode whether K' LTE subframe can accommodate 4 antennas loads of PDT
The IQ sampled point of ripple, that is,：
Wherein, described NC-AxCMost antenna carrier quantity of the PDT being multiplexed for K' LTE subframe, INT is to round.
Can be obtained according to this formula：
That is, most antenna carrier quantity of the PDT that 5 LTE subframes can be multiplexed are 800 in the present embodiment,
Considerably beyond the antenna carrier quantity (4) of actual PDT, therefore can be by the IQ sampled point " loading " of the 4 of PDT antenna carrier
In described 5 LTE subframes.
In the present embodiment, after the IQ sampled point by described PDT4 antenna carrier is mapped in 5 LTE subframes, institute
State remaining sampled point capacity in 5 LTE subframes to be filled that is to say, that N can be filled with invalid IQ sampled pointg-gap-4×
S'=153600-4 × 192=152832 invalid IQ sampled point, described invalid IQ sampled point refers to the IQ sampling for filling
Point, all can ignore its content in transmitting terminal and receiving terminal.
Fig. 6 is the one way in which that the IQ sampled point of PDT and described invalid IQ sampled point are filled in LTE subframe, that is,
The IQ sampled point of described PDT concentrates in together, and described invalid IQ sampled point concentrates in together.In actual applications, can also have
The filling spaced apart with invalid IQ sampled point of the IQ sampled point of other filling modes, such as each antenna carrier, each interval
The quantity of the invalid IQ sampled point of filling can be identical.
After describing and how the IQ sampled point of PDT being mapped in LTE subframe, it is described below and how to carry out wide and narrow strip
Data compatibility transmits.
Assume antenna carrier number N according to the LTE being calculated CPRI supportAFor 4, and it is actually needed the LTE of transmission
IQ sampled point only needs to take two antenna carrier, then just can be multiplexed using one of remaining two antenna carrier
The IQ sampled point of PDT, another one is idle reservation.Referring to Fig. 7, AxC0 and AxC1 is used for the IQ sampled point of " loading " LTE,
AxC2 is used for the IQ sampled point of " loading " PDT, and such multiplex mode achieves the compatible transmission of wide and narrow strip data.
In actual applications, if described REC is transmission side data, described RE is data receiver, then above-mentioned data mapping
Method can be executed by described REC, and described REC can be led to by C＆M (Control and Management controls and manages)
Road is by the antenna carrier number N' of described PDTAThe position (such as AxC sequence number 2) being mapped in described LTE with described PDT is sent to
Described RE, and described REC and described RE arranges the sampling rate of PDT in advance, and described RE is after receiving above-mentioned parameter, permissible
The I/Q data of the described PDT mapping relations in LTE antenna carrier wave are obtained according to above-mentioned parameter, so that according to described mapping relations
Receive the data sending from described REC.If described RE is transmission side data, described REC is data receiver, then in the same manner.
A kind of data mapping method being provided based on above example, the embodiment of the present invention additionally provides a kind of data mapping
Device, to describe its operation principle below in conjunction with the accompanying drawings in detail.
Embodiment three
Referring to Fig. 8, this figure is a kind of structured flowchart of data mapping unit that the present embodiment provides.
The data mapping unit that the present embodiment provides includes：
Parameter acquiring unit 101, parameter calculation unit 102, arrowband map unit 103 and broadband map unit 104；
Described parameter acquiring unit 101, for obtaining IQ sampling rate f of arrowbands', frequency f in broadbandsfAnd arrowband
Antenna carrier quantity N'A, the frequency in described broadband is the inverse of timeslice, and described timeslice refers to rule in the standard agreement of broadband
The fixed time cycle；
Described parameter calculation unit 102, for IQ sampling rate f using described arrowbands' and described broadband frequency fsf
Obtain number S' of each narrow-band antenna carrier wave corresponding arrowband IQ sampled point, and N'AThe arrowband IQ sampling of individual antenna carrier
Number K' of the timeslice in broadband that point can be mapped to；
Described arrowband map unit 103, for by the N' of arrowbandAThe arrowband IQ sampled point of individual antenna carrier is mapped to broadband
K' timeslice in, wherein, the arrowband IQ sampling number that K' timeslice can accommodate is more than or equal to described N'AIndividual antenna
The arrowband IQ sampled point quantity of carrier wave；
Described broadband map unit 104, in units of K' timeslice after mapping, the IQ sampled point of arrowband is reflected
It is mapped in the basic frame of common public radio interface, to complete to arrowband IQ sampled point reflecting in common public radio interface
Penetrate.
The present embodiment passes through to obtain IQ sampling rate f of arrowbands', frequency f in broadbandsfAnd the antenna carrier number of arrowband
Amount N'A, and IQ sampling rate f using described arrowbands' and described broadband frequency fsfObtain each narrow-band antenna carrier wave to correspond to
Arrowband IQ sampled point number S', and N'AThe time in the broadband that the arrowband IQ sampled point of individual antenna carrier can be mapped to
Number K' of piece, by the N' of arrowbandAThe arrowband IQ sampled point of individual antenna carrier is mapped in the K' timeslice in broadband, realizes
Arrowband I/Q data is mapped to the purpose of broadband I/Q data, then in units of K' timeslice after mapping, by arrowband
IQ sampled point is mapped in the basic frame of common public radio interface, to complete arrowband IQ sampled point is connect in general public wireless
Mapping in mouthful.Change the transmission that just can realize to arrowband I/Q data because the present embodiment need not do to existing CPRI, because
This adaptability that improve existing CPRI and utilization rate.
Preferably, if the arrowband IQ sampling number that K' timeslice can accommodate is more than described N 'AIndividual antenna carrier narrow
Carry IQ sampled point quantity, then described device also includes：
Fills unit, for sampled point capacity remaining in K' timeslice is filled with invalid IQ sampled point, described K'
The arrowband IQ sampling number that in individual timeslice, remaining sampled point capacity can accommodate for K' timeslice and described N'AIndividual antenna
The difference of the arrowband IQ sampled point quantity of carrier wave.
A kind of data mapping method being provided based on above example and device, the embodiment of the present invention additionally provides a kind of number
According to mapped device, to describe its operation principle below in conjunction with the accompanying drawings in detail.
Example IV
Referring to Fig. 9, this figure is a kind of structured flowchart of data mapping device that the present embodiment provides.
In the present embodiment, described data mapping device includes
Processor 201；
For storing the memorizer 202 of described processor executable；Described processor and described memorizer pass through to lead to
Letter bus 203 connects；
Wherein, described processor 201 is configured to：
Obtain IQ sampling rate f of arrowbands', frequency f in broadbandsfAnd antenna carrier quantity N' of arrowbandA, described width
The frequency of band is the inverse of timeslice, and described timeslice refers to the time cycle specified in the standard agreement of broadband；
IQ sampling rate f using described arrowbands' and described broadband frequency fsfObtain each narrow-band antenna carrier wave to correspond to
Arrowband IQ sampled point number S', and N'AThe time in the broadband that the arrowband IQ sampled point of individual antenna carrier can be mapped to
Number K' of piece；
N' by arrowbandAThe arrowband IQ sampled point of individual antenna carrier is mapped in the K' timeslice in broadband, wherein, K'
The arrowband IQ sampling number that timeslice can accommodate is more than or equal to described N'AThe arrowband IQ sampled point quantity of individual antenna carrier；
In units of K' timeslice after mapping, the IQ sampled point of arrowband is mapped to the base of common public radio interface
In this frame, with the mapping completing to arrowband IQ sampled point in common public radio interface.
Optionally, using IQ sampling rate f of described arrowbands' and described broadband frequency fsf, obtained by equation below
Number S' of each narrow-band antenna carrier wave corresponding arrowband IQ sampled point：
Wherein, described LCM is the function calculating least common multiple.
Optionally, using IQ sampling rate f of described arrowbands' and described broadband frequency fsf, obtained by equation below
N'ANumber K' of the timeslice in broadband that the arrowband IQ sampled point of individual antenna carrier can be mapped to：
Wherein, described LCM is the function calculating least common multiple.
Optionally, described broadband is LTE standard, and described timeslice is subframe；
The arrowband IQ sampling number that described K' timeslice can accommodate obtains according to the sampling number of the OFDM symbol of LTE
Arrive.
Optionally, the arrowband IQ sampling number that described K' timeslice can accommodate is according to the sampling of the OFDM symbol of LTE
Points are specially：
The sampling number that each LTE subframe can accommodate is obtained according to the sampling number of OFDM symbol；
The sampling number that K' subframe can accommodate is obtained according to the sampling number that each subframe can accommodate.
Optionally, the described sampling number according to OFDM symbol obtains the sampling number tool that each LTE subframe can accommodate
Body is：
Ntti=15 Nsymbol
Wherein, described NsymbolThe sampling number of the OFDM symbol for LTE, described NttiCan accommodate for each LTE subframe
Sampling number.
Optionally, if the arrowband IQ sampling number that K' timeslice can accommodate is more than described N'AIndividual antenna carrier narrow
Carry IQ sampled point quantity, then methods described also includes：
Sampled point capacity remaining in K' timeslice is filled with invalid IQ sampled point, remaining in described K' timeslice
The arrowband IQ sampling number that can accommodate for K' timeslice of sampled point capacity and described N'AThe arrowband IQ of individual antenna carrier adopts
The difference of sampling point quantity.
Above-mentioned processor can be microprocessor or this processor can also be any conventional processor.In conjunction with this
The step of the method disclosed in bright embodiment, can be embodied directly in hardware processor execution and complete, or with processor
Hardware and software module combination execution complete.When implemented in software, the code realizing above-mentioned functions can be stored in meter
In calculation machine computer-readable recording medium.Computer-readable medium includes computer-readable storage medium.Storage medium can be that computer can access
Any usable medium.As example but be not limited to：Computer-readable medium can be that (English full name is random access memory
Random access memory, english abbreviation be RAM), read only memory (English full name be read-only memory, English
ROM be abbreviated as in literary composition), EEPROM (English full name be electrically erasable
Programmable read-only memory, english abbreviation be EEPROM), read-only optical disc (English full name be compact
Disc read-only memory, english abbreviation is CD-ROM) or other optical disc storage, magnetic disk storage medium or other magnetic
Storage device or can be used in carrying or store the program code with instruction or data structure form can be by computer
Any other medium of access.Computer-readable medium can be that (English full name is compact disc to compression laser disc, English contracting
Be written as CD), laser disc, digital video disc (English full name be digital video disc, english abbreviation be DVD), floppy disk
Or blu-ray disc.
When introducing elements of various embodiments of the present invention, article " ", " one ", " this " and " described " are intended to
Indicate one or more elements.Word " inclusion ", "comprising" and " having " are all inclusives and mean except listing
Outside element, can also there are other elements.
Each embodiment in this specification is all described by the way of going forward one by one, identical similar portion between each embodiment
Divide mutually referring to what each embodiment stressed is the difference with other embodiment.Especially for embodiment
Three and example IV for, because it is substantially similar to embodiment one and embodiment two, so describing fairly simple, correlation
Place illustrates referring to the part of embodiment one and embodiment two.Device embodiment described above is only schematically,
The wherein said unit illustrating as separating component and module can be or may not be physically separate.In addition, also
Some or all of unit therein and module can be selected according to the actual needs to realize the purpose of this embodiment scheme.This
Field those of ordinary skill is not in the case of paying creative work, you can to understand and to implement.
The above is only the specific embodiment of the present invention it is noted that ordinary skill people for the art
For member, under the premise without departing from the principles of the invention, some improvements and modifications can also be made, these improvements and modifications also should
It is considered as protection scope of the present invention.
Claims (10)
1. a kind of data mapping method is it is characterised in that methods described includes：
Obtain IQ sampling rate f of arrowbands', frequency f in broadbandsfAnd antenna carrier quantity N' of arrowbandA, the frequency in described broadband
Rate is the inverse of timeslice, and described timeslice refers to the time cycle specified in the standard agreement of broadband；
IQ sampling rate f using described arrowbands' and described broadband frequency fsfObtain each narrow-band antenna carrier wave corresponding narrow
With number S' of IQ sampled point, and N'AThe timeslice in broadband that the arrowband IQ sampled point of individual antenna carrier can be mapped to
Number K'；
N' by arrowbandAThe arrowband IQ sampled point of individual antenna carrier is mapped in the K' timeslice in broadband, wherein, K' time
The arrowband IQ sampling number that piece can accommodate is more than or equal to described N'AThe arrowband IQ sampled point quantity of individual antenna carrier；
In units of K' timeslice after mapping, the IQ sampled point of arrowband is mapped to the basic frame of common public radio interface
In, with the mapping completing to arrowband IQ sampled point in common public radio interface.
2. method according to claim 1 is it is characterised in that utilize IQ sampling rate f of described arrowbands' and described broadband
Frequency fsf, number S' of each narrow-band antenna carrier wave corresponding arrowband IQ sampled point is obtained by equation below：
Wherein, described LCM is the function calculating least common multiple.
3. method according to claim 1 and 2 is it is characterised in that utilize IQ sampling rate f of described arrowbands' and described
Frequency f in broadbandsf, N' is obtained by equation belowAThe broadband that the arrowband IQ sampled point of individual antenna carrier can be mapped to when
Between piece number K'：
Wherein, described LCM is the function calculating least common multiple.
4. it is characterised in that described broadband is LTE standard, described timeslice is subframe to method according to claim 1；
The arrowband IQ sampling number that described K' timeslice can accommodate obtains according to the sampling number of the OFDM symbol of LTE.
5. method according to claim 4 is it is characterised in that the arrowband IQ sampled point that can accommodate of described K' timeslice
The sampling number of several OFDM symbol according to LTE is specially：
The sampling number that each LTE subframe can accommodate is obtained according to the sampling number of OFDM symbol；
The sampling number that K' subframe can accommodate is obtained according to the sampling number that each subframe can accommodate.
6. method according to claim 5 is it is characterised in that the described sampling number according to OFDM symbol obtains each
The sampling number that LTE subframe can accommodate is specially：
Ntti=15 Nsymbol
Wherein, described NsymbolThe sampling number of the OFDM symbol for LTE, described NttiFor adopting that each LTE subframe can accommodate
Number of samples.
If 7. method according to claim 1 is it is characterised in that the arrowband IQ sampling number that can accommodate of K' timeslice
More than described N'AThe arrowband IQ sampled point quantity of individual antenna carrier, then methods described also include：
Sampled point capacity remaining in K' timeslice is filled with invalid IQ sampled point, remaining in described K' timeslice adopts
The arrowband IQ sampling number that sampling point capacity can accommodate for K' timeslice and described N'AThe arrowband IQ sampled point of individual antenna carrier
The difference of quantity.
8. a kind of data mapping unit is it is characterised in that described device includes：
Parameter acquiring unit, parameter calculation unit, arrowband map unit and broadband map unit；
Described parameter acquiring unit, for obtaining IQ sampling rate f of arrowbands', frequency f in broadbandsfAnd the antenna of arrowband carries
Wave number amount N'A, the frequency in described broadband is the inverse of timeslice, and described timeslice refers to the time specified in the standard agreement of broadband
Cycle；
Described parameter calculation unit, for IQ sampling rate f using described arrowbands' and described broadband frequency fsfObtain every
Number S' of individual narrow-band antenna carrier wave corresponding arrowband IQ sampled point, and N'AThe arrowband IQ sampled point of individual antenna carrier can
Number K' of the timeslice in the broadband being mapped to；
Described arrowband map unit, for by the N' of arrowbandAWhen the arrowband IQ sampled point of individual antenna carrier is mapped to K' of broadband
Between in piece, wherein, the arrowband IQ sampling number that K' timeslice can accommodate is more than or equal to described N'AIndividual antenna carrier narrow
Band IQ sampled point quantity；
Described broadband map unit, in units of K' timeslice after mapping, the IQ sampled point of arrowband is mapped to logical
With in the basic frame of common wireless interface, with the mapping completing to arrowband IQ sampled point in common public radio interface.
If 9. device according to claim 8 is it is characterised in that the arrowband IQ sampling number that can accommodate of K' timeslice
More than described N'AThe arrowband IQ sampled point quantity of individual antenna carrier, then described device also include：
Fills unit, for filling sampled point capacity remaining in K' timeslice with invalid IQ sampled point, when described K'
Between remaining sampled point capacity can accommodate for K' timeslice in piece arrowband IQ sampling number and described N'AIndividual antenna carrier
Arrowband IQ sampled point quantity difference.
10. a kind of data mapping device is it is characterised in that described equipment includes：
Processor；
For storing the memorizer of described processor executable；
Wherein, described processor is configured to：
Obtain IQ sampling rate f of arrowbands', frequency f in broadbandsfAnd antenna carrier quantity N' of arrowbandA, the frequency in described broadband
Rate is the inverse of timeslice, and described timeslice refers to the time cycle specified in the standard agreement of broadband；
IQ sampling rate f using described arrowbands' and described broadband frequency fsfObtain each narrow-band antenna carrier wave corresponding narrow
With number S' of IQ sampled point, and N'AThe timeslice in broadband that the arrowband IQ sampled point of individual antenna carrier can be mapped to
Number K'；
N' by arrowbandAThe arrowband IQ sampled point of individual antenna carrier is mapped in the K' timeslice in broadband, wherein, K' time
The arrowband IQ sampling number that piece can accommodate is more than or equal to described N'AThe arrowband IQ sampled point quantity of individual antenna carrier；
In units of K' timeslice after mapping, the IQ sampled point of arrowband is mapped to the basic frame of common public radio interface
In, with the mapping completing to arrowband IQ sampled point in common public radio interface.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2018058550A1 (en) * | 2016-09-30 | 2018-04-05 | 海能达通信股份有限公司 | Data mapping method, apparatus, and device |
| CN108599892A (en) * | 2017-12-29 | 2018-09-28 | 海能达通信股份有限公司 | a kind of data transmission method and device |
| CN114252697A (en) * | 2020-09-23 | 2022-03-29 | 麦克维尔空调制冷(武汉)有限公司 | APF oversampling method, system and storage medium |
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| CN101860394A (en) * | 2010-05-25 | 2010-10-13 | 中兴通讯股份有限公司 | Multi-standard IQ data mapping method and apparatus based on CPRI |
| WO2012087206A1 (en) * | 2010-12-22 | 2012-06-28 | Telefonaktiebolaget L M Ericsson (Publ) | Method and arrangement for providing signal path configurations in a distributed radio base station |
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| CN101860394A (en) * | 2010-05-25 | 2010-10-13 | 中兴通讯股份有限公司 | Multi-standard IQ data mapping method and apparatus based on CPRI |
| WO2012087206A1 (en) * | 2010-12-22 | 2012-06-28 | Telefonaktiebolaget L M Ericsson (Publ) | Method and arrangement for providing signal path configurations in a distributed radio base station |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2018058550A1 (en) * | 2016-09-30 | 2018-04-05 | 海能达通信股份有限公司 | Data mapping method, apparatus, and device |
| CN108599892A (en) * | 2017-12-29 | 2018-09-28 | 海能达通信股份有限公司 | a kind of data transmission method and device |
| CN108599892B (en) * | 2017-12-29 | 2021-03-19 | 海能达通信股份有限公司 | Data transmission method and device |
| CN114252697A (en) * | 2020-09-23 | 2022-03-29 | 麦克维尔空调制冷(武汉)有限公司 | APF oversampling method, system and storage medium |
| CN114252697B (en) * | 2020-09-23 | 2024-02-13 | 麦克维尔空调制冷(武汉)有限公司 | APF oversampling method, system and storage medium |
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