WO2018058549A1 - 数据映射方法、装置及设备 - Google Patents

数据映射方法、装置及设备 Download PDF

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Publication number
WO2018058549A1
WO2018058549A1 PCT/CN2016/101132 CN2016101132W WO2018058549A1 WO 2018058549 A1 WO2018058549 A1 WO 2018058549A1 CN 2016101132 W CN2016101132 W CN 2016101132W WO 2018058549 A1 WO2018058549 A1 WO 2018058549A1
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Prior art keywords
narrowband
band
sampling
narrow
broadband
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English (en)
French (fr)
Inventor
焦富强
鲁志兵
项根星
王志国
汪嘉文
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Hytera Communications Corp Ltd
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Hytera Communications Corp Ltd
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Priority to PCT/CN2016/101132 priority Critical patent/WO2018058549A1/zh
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
    • H04W88/08—Access point devices

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  • the present invention relates to the field of communications, and in particular, to a data mapping method, apparatus, and device.
  • the base station system is a distributed radio frequency system.
  • a common public radio interface is a wireless device control center where the BBU is located ( Radio Equipment Control (REC), a standard interface for interaction with the radio equipment (Radio Equipment, RE) where the RRU is located.
  • REC Radio Equipment Control
  • RE Radio Equipment
  • the transmission protocol of the interface is called CPRI protocol.
  • Figure 1 shows the basic configuration of CPRI.
  • the CPRI system also includes a CPRI link.
  • 2 is a hierarchical structure diagram of the CPRI protocol, which shows that the CPRI protocol is divided into two layers: a physical layer and a data link layer.
  • the digital baseband modulated signal between the REC and the RE is transmitted through a data stream (referred to as IQ data) channel of two components of in-phase/quadrature-phase (IQ) in the data link layer.
  • IQ data data stream
  • the REC transmits IQ data to the RE
  • the RE is referred to as a data receiver
  • the RE transmits IQ data to the REC
  • the RE is referred to as a data transmitter
  • the REC is referred to as a data receiver.
  • IQ data mapping is required before the IQ data is transmitted. The purpose is to enable the IQ data to be transmitted according to the CPRI transmission requirements.
  • IQ data mapping methods are proposed in the existing CPRI protocol: based on IQ sample based, symbol based and backward compatible.
  • the basic idea of the third type of IQ data mapping is to evenly distribute the wideband IQ samples of the broadband N A antenna carrier (AxC) in K basic frames, each AxC. It has the same characteristics (bit width, sampling rate are the same), and each AxC corresponds to S broadband IQ sampling points.
  • the basic frame is the basic unit of CPRI transmission, and the time corresponding to the N A ⁇ S wide-band IQ sampling points is the same as the time of the K basic frames.
  • a basic frame corresponds to an AxC Container (AxC Container), so the size of an AxC container N C needs to be able to bear at least The conditions of the sampling points. If the N A ⁇ S wideband IQ sampling points do not fill the AxC containers in the K basic frames, the remaining capacity in the AxC container is filled with invalid sampling points.
  • S and K is given in the agreement, namely:
  • f s is the sampling rate of the wideband IQ data
  • f c is the CPRI basic frame rate, fixed at 3.84 MHz
  • LCM is a function for calculating the least common multiple.
  • the present invention provides a data mapping method, apparatus and device, which can achieve the purpose of transmitting narrowband IQ data without changing the CPRI.
  • a data mapping method including:
  • the narrowband IQ sample points are mapped into the basic frame of the general public radio interface in units of the mapped K'th broadband time slices to complete mapping of the narrowband IQ sample points in the general public radio interface.
  • N 'A narrowband antenna-carrier mapping set of samples corresponding baseband set of samples mapped to broadband K' wideband time slice comprising:
  • the N 'A narrowband antenna-carrier Baseband samples corresponding set of intervals N g-gap, mapping K' wideband time slice.
  • the determining method of the preset number includes:
  • a number of narrowband antenna carriers less than or equal to the maximum number of narrowband sampling point groups N C-AxC is determined as the preset number.
  • the bit width N SAxC of the synchronization sequence, and the number N SAxC of narrow-band IQ sampling points included in each of the narrow-band sampling point groups calculate K′ broadband
  • the number of maximum narrow-band sampling point groups N C-AxC that each of the intervals N g-gap can accommodate in the time slice includes:
  • the K′ bandwidth is calculated according to the bandwidth N tti of the broadband, the number K′ of the wide-band time slices, and the number S′ of narrow-band IQ sampling points corresponding to each of the narrow-band antenna carriers.
  • the interval N g-gap of the adjacent two baseband sampling point groups mapped in the time slice includes:
  • GCD represents the calculation of the greatest common divisor of the two.
  • the synchronizing sequence includes a slot counting portion and a sample counting portion, and the acquiring the synchronization sequence corresponding to each of the mapping sampling point groups includes:
  • Determining the bit width of the synchronization sequence is:
  • CEIL is an up-rounding function
  • M i is the number of bits in the i-th counting period, i is a positive integer greater than or equal to 0 and less than or equal to N-1, and N is the total number of counting periods of narrow-band antenna carriers to be transmitted.
  • 2M is the number of bits of a narrow-band IQ sampling point;
  • the number N SAxC includes:
  • GCD represents the calculation of the greatest common divisor of the two.
  • a data mapping device comprising:
  • a parameter obtaining module configured to obtain a sampling rate f′ s of the narrowband narrowband IQ data, a frequency f sf of the broadband, and a number N′ A of the narrowband antenna carriers, where the frequency of the broadband is a reciprocal of the time slice, where the time slice refers to The time period specified in the broadband standard protocol;
  • a first parameter calculation module for utilizing the narrowband sampling rate of narrowband IQ data f 's and the wideband frequency f sf give the number S corresponding to each of the narrowband antenna-carrier narrowband sampling points IQ', and N 'of said a number of narrow-band antenna-carrier narrowband IQ sample point can be mapped to a broadband time slices K';
  • a second parameter calculation module configured to calculate a narrowband included in the narrowband sampling point group according to the number S' of the narrowband IQ sampling points, the number K' of the wideband time slices, and the bandwidth Ntti of the broadband Number of IQ sampling points N SAxC ;
  • a second dividing module configured to divide the narrowband sampling groups corresponding to the N′ A narrowband antenna carriers into a plurality of mapping sampling point groups by using a preset number of narrowband sampling groups
  • a synchronization sequence acquisition module configured to acquire a synchronization sequence corresponding to each of the mapping sample point groups, and use a synchronization sequence corresponding to a mapping sample point group as a baseband sampling point group, where the synchronization sequence includes the corresponding Mapping location information of each narrowband IQ sample point in the sample point group in the narrowband antenna carrier;
  • Narrowband mapping module for 'A set of samples the baseband narrowband antenna-carrier mapping corresponding set of samples mapped to broadband K' of the N time slice broadband, wherein the K 'of broadband baseband sampling points set number of time slices can accommodate greater or equal to the number of baseband sampling point groups' a narrow-band antenna-carrier narrowband IQ samples corresponding to the N;
  • the broadband mapping module is configured to map the narrowband IQ sampling points to the basic frame of the general public radio interface in units of the mapped K'th broadband time slices, to complete the sampling of the narrowband IQ samples. Use mappings in the public wireless interface.
  • the synchronization sequence includes a slot count portion and a sample count portion
  • the synchronization sequence acquisition module includes:
  • a bit width determining unit configured to determine a bit width of the synchronization sequence as:
  • CEIL is an up-rounding function
  • M i is the number of bits in the i-th counting period, i is a positive integer greater than or equal to 0 and less than or equal to N-1, and N is the total number of counting periods of narrow-band antenna carriers to be transmitted.
  • 2M is the number of bits of a narrow-band IQ sampling point;
  • a synchronization information filling unit configured to fill in the time slot counting portion and the location of the synchronization sequence according to position information of each narrowband IQ sampling point in the narrowband antenna carrier in the mapped sampling point group corresponding to the synchronization sequence Describe the point count section.
  • a data mapping device comprising:
  • a memory for storing the processor executable instructions
  • processor is configured to:
  • the self-corresponding synchronization sequence is used as a baseband sampling point group, and the synchronization sequence includes position information of each narrow-band IQ sampling point in the narrow-band antenna carrier in the mapping sample point group corresponding thereto;
  • the narrowband IQ sample points are mapped into the basic frame of the general public radio interface in units of the mapped K'th broadband time slices to complete mapping of the narrowband IQ sample points in the general public radio interface.
  • the IQ data sampling rate of the sampling rate f the present invention 'the number s, the frequency f of broadband and narrowband antenna carrier SF N' by obtaining narrow-band narrowband A, and using the narrowband narrowband IQ data of f 'and the wideband S
  • the frequency f sf is obtained as the number S′ of narrow-band IQ sampling points corresponding to each of the narrow-band antenna carriers, and the number K′ of wide-band time slices to which the narrow-band IQ sampling points of the N′ A narrow-band antenna carriers can be mapped to the 'a number of antennas carrier mapping narrowband to broadband IQ samples K' N narrowband wideband time slice, to achieve the purpose of mapping the IQ data to the broadband narrowband IQ data is then mapped to K '
  • the wideband time slice is mapped to the narrowband IQ sample points into the basic frame of the general public radio interface to complete the mapping of the narrowband IQ sample points in the common public radio interface.
  • N 'A narrowband antenna-carrier narrowband IQ samples were bundling process, i.e. N 'A narrowband antenna-carrier narrowband IQ
  • the sampling point is divided into a plurality of narrow-band sampling point groups.
  • the embodiment of the present application further sets a synchronization sequence for each preset number of narrowband sampling groups, that is, a mapping sampling point group.
  • the synchronization sequence includes position information of each narrow-band IQ sampling point in the narrow-band antenna carrier in the mapping sample point group corresponding thereto, so that the data receiver can accurately parse and restore the narrow-band IQ data in the basic frame according to the synchronization sequence.
  • FIG. 1 is a basic configuration diagram of CPRI
  • Figure 2 is a hierarchical structure diagram of the CPRI protocol
  • FIG. 3 is a schematic flowchart diagram of an implementation manner of a data mapping method according to an embodiment of the present disclosure
  • FIG. 4 is a schematic diagram of an implementation of a synchronization sequence
  • FIG. 5 is a schematic structural diagram of a frame in which a baseband sampling point group corresponding to N′ A narrowband antenna carriers is mapped in K′ broadband time slots according to an interval N g-gap according to an embodiment of the present disclosure
  • FIG. 6 is a schematic diagram of a protocol layer of a CPRI interface according to an embodiment of the present disclosure
  • Figure 7 is a frame structure diagram of the PDT system
  • Figure 8 is a diagram showing the baseband modulation process of the PDT
  • FIG. 9 is a schematic diagram of another implementation of a synchronization sequence
  • Figure 10 is a detailed schematic diagram of a synchronization sequence
  • FIG. 11 is a schematic structural diagram of a frame in which a baseband sampling point group corresponding to four narrowband antenna carriers is mapped in five wideband time slices according to an interval 800 according to an embodiment of the present disclosure;
  • FIG. 12 is a schematic diagram of carrier multiplexing of an LTE antenna for wide-narrowband data compatible transmission in a data mapping method according to an embodiment of the present disclosure
  • FIG. 13 is a structural block diagram of a data mapping apparatus according to an embodiment of the present application.
  • FIG. 14 is a structural block diagram of a data mapping device according to an embodiment of the present disclosure.
  • the prior art CPRI protocol provides a wideband-based broadband IQ data mapping method.
  • the basic idea is to uniformly average the broadband IQ sample points (AQ samples) of the wideband N A antenna carriers (AxC). It is allocated in K basic frames, and gives the number S of broadband IQ sampling points corresponding to each AxC, and the basic frame corresponding to the broadband IQ sampling points of the N A antenna carriers (AxC).
  • the formula for the number K In general, the number of basic frames K calculated by wideband-based broadband IQ data transmission has only a single digit, and if the formula is directly applied to narrowband IQ data mapping for narrowband, the number of basic frames calculated is K. It is much higher than the number of basic frames calculated by broadband-based broadband IQ data transmission.
  • the invention proposes a method of data mapping, the basic idea is: First, the 'narrow band antenna-carrier mapping A corresponding IQ narrowband to broadband sampling point K' of the N narrow-band broadband time slice Then, the narrowband narrowband IQ sampling points are mapped into the basic frame of the general public radio interface in units of the mapped K'th broadband time slices. That is to say, the narrowband IQ sampling points of the narrowband are first “packaged” into wideband broadband IQ sampling points, and then the mapping method of the broadband IQ sampling points is mapped in the prior art, so that the existing CPRI pair narrowband can be used. The IQ data continues to be transmitted. With the technical solution in the embodiment of the present application, the CPRI can simultaneously transmit broadband and narrowband data, thereby achieving compatible transmission of wide and narrowband data, and improving the adaptability and utilization of the existing CPRI.
  • FIG. 3 is a schematic flowchart of an implementation manner of a data mapping method according to an embodiment of the present disclosure, where the method includes:
  • Step S301 obtaining the narrowband sampling rate of narrowband IQ data of f 'and the number of the frequency f sf s, wideband narrowband antenna-carrier N' A.
  • the frequency of the wideband is the reciprocal of the time slice, and the time slice refers to the time period specified in the wideband standard protocol.
  • the frequency of the broadband is the reciprocal of the time slice, and the time slice refers to a time period specified in the broadband standard protocol, such as a subframe, a time slot, a radio frame, and an OFDM (Orthogonal Frequency Division Multiplexing). Symbols, etc.
  • Step S302 narrowband sampling rate of the narrowband IQ data f 's and the wideband frequency f sf give the number S corresponding to each of the narrowband antenna-carrier narrowband sampling point IQ', and N 'A number The number K' of time slices of the wideband that the narrowband IQ sample points of the narrowband antenna carrier can be mapped to.
  • the number S′ of the narrowband IQ sampling points corresponding to each of the narrowband antenna carriers can be obtained by the following formula:
  • the LCM is a function for calculating a least common multiple.
  • the N 'A number of antennas IQ narrowband carriers can be mapped to a sample point of time slices the broadband K' can be obtained by the following formula:
  • the LCM is a function for calculating a least common multiple.
  • Step S303 Calculate the narrow-band IQ sampling points included in the narrow-band sampling point group according to the number S' of the narrow-band IQ sampling points, the number K' of the wide-band time slices, and the bandwidth N tti of the broadband Number N SAxC .
  • N SAxC can be obtained by the following formula:
  • GCD represents the calculation of the greatest common divisor of the two.
  • Step S304 the N 'A narrowband antenna-carrier narrowband IQ samples to a IQ samples N SAxC units divided into a plurality of narrow set of samples.
  • Step S305 The N 'A narrowband antenna-carrier narrowband samples corresponding to the group, the number of narrow-band samples to a predetermined group units, into a plurality of groups of sampling points mapped.
  • the method for determining the preset number includes:
  • N SAxC and N g-gap can be obtained by the following formula:
  • GCD represents the calculation of the greatest common divisor of the two, N tti is the bandwidth of the broadband.
  • Step S306 Acquire a synchronization sequence corresponding to each of the mapping sample point groups, and use a synchronization sequence corresponding to a mapping sample point group as a baseband sampling point group.
  • the synchronization sequence includes location information of each narrowband IQ sample point in the narrowband antenna carrier in the mapped sample point group corresponding thereto.
  • the synchronization sequence SYNC is a synchronization identifier of the narrowband antenna carrier, and is used for recording and transmitting position information of each narrowband IQ sampling point in the narrowband antenna carrier for frame timing recovery of the data receiver.
  • the synchronization sequence can be as shown in Figure 4.
  • the N SYNC of the synchronization sequence SYNC bit width can be the number of bits of one or more narrowband IQ sample points, depending on whether the bit length can accommodate the count of the entire period of the narrowband antenna carrier.
  • determining a bit width of the synchronization sequence is:
  • CEIL is an up-rounding function
  • M i is the number of bits in the i-th counting period
  • i is a positive integer greater than or equal to 0 and less than or equal to N-1
  • N is the total number of counting periods of narrow-band antenna carriers to be transmitted.
  • 2M is the number of bits of a narrow-band IQ sample point.
  • Step S307 the N 'samples A mapping narrowband antenna-carrier group corresponding to the point set of samples of the baseband, broadband mapped to K' broadband time slice, wherein, the K 'wideband time sheets number baseband sampling point groups can accommodate the number is greater than or equal to the set of samples of a baseband 'a narrow-band antenna-carrier narrowband IQ samples corresponding to the N.
  • K 'groups with the number of sampling points of a group of time slices can accommodate broadband greater than the N' number of baseband samples A group antenna carriers, you may be K 'wideband time slice
  • the remaining sampling point capacity is filled with invalid IQ sampling points, and the remaining sampling point capacity in the K′ wide-band time slices is the number of narrow-band IQ sampling points that can be accommodated by K′ wide-band time slices and the N′ A The difference between the number of narrow-band IQ samples of the antenna carrier.
  • Step S308 Mapping the narrowband IQ sampling points into the basic frame of the general public radio interface in units of the mapped K'th broadband time slices to complete mapping of the narrowband IQ sampling points in the common public radio interface.
  • the IQ data sampling rate of the sampling rate f the present invention 'the number s, the frequency f of broadband and narrowband antenna carrier SF N' by obtaining narrow-band narrowband A, and using the narrowband narrowband IQ data of f 'and the wideband S
  • the frequency f sf is obtained as the number S′ of narrow-band IQ sampling points corresponding to each of the narrow-band antenna carriers, and the number K′ of wide-band time slices to which the narrow-band IQ sampling points of the N′ A narrow-band antenna carriers can be mapped to the 'a number of antennas carrier mapping narrowband to broadband IQ samples K' N narrowband wideband time slice, to achieve the purpose of mapping the IQ data to the broadband narrowband IQ data is then mapped to K '
  • the wideband time slice is mapped to the narrowband IQ sample points into the basic frame of the general public radio interface to complete the mapping of the narrowband IQ sample points in the common public radio interface.
  • N 'A narrowband antenna-carrier narrowband IQ samples were bundling process, i.e. N 'A narrowband antenna-carrier narrowband IQ
  • the sampling point is divided into a plurality of narrow-band sampling point groups.
  • the embodiment of the present application further sets a synchronization sequence for each preset number of narrowband sampling groups, that is, a mapping sampling point group.
  • the synchronization sequence includes position information of each narrow-band IQ sampling point in the narrow-band antenna carrier in the mapping sample point group corresponding thereto, so that the data receiver can accurately parse and restore the narrow-band IQ data in the basic frame according to the synchronization sequence.
  • the baseband sampling point group corresponding to the mapping sample point group of the N′ A narrowband antenna carriers is mapped into a wide-band K′ broadband time slice.
  • An implementation method includes:
  • a frame structure diagram of a baseband sampling point group corresponding to N′ A narrowband antenna carriers is mapped in K′ broadband time slices according to an interval N g-gap according to an embodiment of the present disclosure.
  • a narrowband IQ sampling point of a narrowband antenna carrier and the invalid IQ sampling point are filled in a time slice of K' broadband, that is, a narrowband IQ sampling point of a narrowband antenna carrier is grouped together, and invalid IQ sampling is performed. Points are grouped together. In practical applications, there may be other filling methods. For example, the narrow-band IQ sampling points of the respective narrow-band antenna carriers are spaced apart from the invalid IQ sampling points, and the number of invalid IQ sampling points filled in each interval may be the same.
  • Pading portion of Figure 5 is populated with invalid IQ sample points.
  • Each baseband sampling point group SAxC Group includes a synchronization sequence SYNC and a plurality of narrowband sampling point groups.
  • one or more narrowband sampling point groups may be selected from each narrowband antenna carrier, and each narrowband antenna carrier is selected.
  • One or more narrowband sample point groups are used as a mapped narrowband sample point group. Shown in FIG.
  • SAxCr the narrow band sample point groups included in the SAxC Group are: SAxC0, SAxC1, SAxC2, ..., SAxC(N' A -1).
  • the narrowband antenna carrier can be loaded into K' broadband time slices at uniform time intervals, so that the transmission delay is minimized, and the K's wide time slice is used as a basic unit to ensure compatible transmission. At the same time, it also facilitates data synchronization.
  • the narrowband is a PDT (Police Digital Trunking or Public Digital Trunking) system
  • the broadband is an LTE (Long Term Evolution) system. Not only the transmission of narrowband IQ data of the PDT system but also the compatible transmission of the narrowband IQ data of the PDT system with the broadband IQ data of the LTE system is realized.
  • FIG. 6 the figure shows a frame structure of the PDT system.
  • the frame structure 60 ms is divided into 2 slots, each slot having a length of 30 ms.
  • a time slot consists of three parts: synchronous or embedded signaling, voice or data, and CACH (below Line) or guard interval (upstream).
  • Each frame of data includes 144 OFDM symbols, and the symbol rate is 4800 Hz. Since 4FSK (Frequency-shift keying) modulation is used, each time slot carries 288 bits of valid data.
  • 4FSK Frequency-shift keying
  • the baseband modulation process of the PDT is shown in Fig. 7, that is, first, every 2 bits of data is mapped into modulation symbols, then the modulation symbols are upsampled and shaped, and finally subjected to frequency modulation to generate narrowband IQ data, that is, baseband signals.
  • the narrowband IQ data is upsampled by a certain multiple over the symbol rate.
  • N' A 4.
  • the LTE subframe is used as a time slice, and the length of each subframe is 1 ms, so the frequency f sf of the subframe is 1000 Hz (the reciprocal of the length of a single subframe).
  • each antenna carrier of the PDT corresponds to S' narrowband IQ sampling points.
  • LCM is the least common multiple of the two.
  • the number of narrow-band IQ sampling points included in each of the narrow-band sampling point groups can be obtained according to the following formula:
  • each narrowband antenna carrier includes 192 narrowband sample point groups.
  • the K' sub-frames accommodate a plurality of baseband sample point groups, and the intervals between adjacent two baseband sample point groups are:
  • the maximum narrowband sampling point group data that can be mapped for each interval of N g-gap is:
  • the preset number is 4, that is, a narrow-band sampling point group is selected from each narrow-band antenna carrier, that is, a narrow-band sampling point group of four different narrow-band antenna carriers is used as a mapping sampling point group.
  • bit width of the synchronization sequence of the mapped sample point group is calculated as follows:
  • the sampling rate is 8 times.
  • the narrow-band IQ sampling rate of f' s 38.4ksps
  • the bit width of the synchronization sequence is:
  • CEIL is an up-rounding function
  • M i is the number of bits in the i-th counting period
  • i is a positive integer greater than or equal to 0 and less than or equal to N-1
  • N is the total number of counting periods of narrow-band antenna carriers to be transmitted.
  • 2M is the number of bits of a narrow-band IQ sample point.
  • the synchronization sequence SYNC format in each SAxC Group is shown in Figure 8.
  • the 1152 sample points need 11 bits to represent, and the 11 bit portion is called the sample point count portion.
  • the first 18 bits of the synchronization sequence can be reserved, the 19th bit is the slot count portion, and the sample count portion can be stored in the lowest 11 bits of the synchronization sequence, with a valid range of 0 to 1151.
  • the synchronization sequence is for the CPRI data receiver and the data transmitter according to the synchronization sequence.
  • the sequence number in the SNYC is synchronized with the timing.
  • FIG. 9 is a schematic diagram of a specific implementation manner of a synchronization sequence provided by an embodiment of the present application.
  • the narrowband IQ sampling points in each of the narrowband antenna carriers are arranged in a "slot count, sample count" manner.
  • the number of sampling points of the PDT that can be accommodated in the LTE subframe can be obtained according to the number of sampling points of the OFDM symbol of the LTE, and the number of sampling points of the OFDM symbol of the LTE can be obtained according to the bandwidth check table of the LTE. Assuming that the bandwidth of the LTE is 20 MHz, the sampling point N symbol of the OFDM symbol corresponding to the bandwidth can be found according to Table 1 as 2048.
  • the number of IQ sampling points (768) corresponding to the four antenna carriers of the PDT in this embodiment is much smaller than the number of sampling points N g (153600) that can be accommodated in five LTE subframes, so that PDT can be implemented. Mapping between IQ sample points and LTE subframes.
  • the number of narrow-band IQ sampling points included in each of the narrow-band sampling point groups can be obtained according to the following formula:
  • GCD represents the calculation of the greatest common divisor of the two.
  • the length of a baseband sample point group is the sum of the length of the synchronization sequence and the length of the mapped narrowband sample point group, that is, 34.
  • the baseband sample point group data that can be accommodated by K' wideband time slices can be calculated by the following formula:
  • each of the baseband sampling The point group SAxC Group includes a synchronization sequence and four narrow-band sampling point groups, which belong to different narrow-band antenna carriers, respectively.
  • K′ LTE subframes can accommodate the IQ sample points of the 4 antenna carriers of the PDT.
  • the maximum narrowband sampling point group data that can be mapped for each interval of N g-gap is:
  • N C The maximum number of narrow-band sample point groups that can be accommodated in K' LTE subframes.
  • AxC0 ie, LTE AxC#0
  • AxC1 ie, LTE AxC#1
  • AxC2 ie, LTE AxC#2
  • the embodiment of the present application can provide an adaptation layer on the data link layer of the CPRI interface.
  • the data mapping method provided by the embodiment of the present application can be applied to the CPRI interface.
  • the CPRI provided in the embodiment of the present application is a CPRI. Interface diagram.
  • the adaptation layer maps the narrowband IQ sampling points of the narrowband antenna carrier to the wideband time slice.
  • the narrowband IQ data of the narrowband and the wideband IQ data of the wideband are considered to be exactly the same, both being 2M.
  • the size of the narrowband IQ sampling point in the narrowband antenna carrier, the interval between the respective baseband sampling point groups, and the like in the application embodiment are all in units of the number of bits of the narrowband IQ sampling point.
  • the data link layer provides an AxC channel for IQ data interaction; the adaptation layer calls the AxC channel of the data link layer and multiplexes on it to obtain multiple SAxC channels.
  • the time slice of the broadband is referred to as AxC (taking LTE AxC as an example in FIG. 12), and the narrowband antenna carrier mapped to the AxC is SAxC.
  • the adaptation layer will be each SAxC Group (including SAxC0, SAxC1, SAxC2, ..., SAxC(N' A -1), as shown in Fig. 5, only one SAxC Group is shown in Fig.
  • LTE AxC#0 represents the first wideband time slice
  • LTE AxC#(K'-1) is the K'th broadband time slice
  • data link layer of CPRI interface data The multiplexing in the link layer refers to mapping the narrowband IQ sampling points into the basic frames of the general public radio interface in units of the mapped K'th broadband time slices.
  • the data mapping method may be performed by the REC, and the REC may pass C&M (Control and Management, Control and Management). Transmitting, by the channel, the number of antenna carriers N' A of the PDT and the location of the PDT in the LTE (eg, AxC sequence number 2) to the RE, and the REC and the RE pre-arrange the sampling rate of the PDT After receiving the foregoing parameters, the RE may obtain a mapping relationship between the IQ data of the PDT in the LTE antenna carrier according to the foregoing parameter, so as to receive data sent by the REC according to the mapping relationship. If the RE is a data transmission party and the REC is a data data receiver, the same is true.
  • C&M Control and Management, Control and Management
  • an embodiment of the present invention further provides a data mapping apparatus, and the working principle thereof will be described in detail below with reference to the accompanying drawings.
  • FIG. 13 is a structural block diagram of a data mapping apparatus according to an embodiment of the present application.
  • the data mapping apparatus includes: a parameter obtaining module 1301, a first parameter calculating module 1302, a second parameter calculating module 1303, a first dividing module 1304, a second dividing module 1305, a synchronization sequence acquiring module 1306, and a narrowband mapping module. 1307 and a broadband mapping module 1308, wherein:
  • the parameter obtaining module 1301 is configured to obtain a sampling rate f′ s of the narrowband IQ data of the narrowband, a frequency f sf of the broadband, and a number N′ A of the narrowband antenna carriers, where the frequency of the broadband is a reciprocal of the time slice, where the time slice is Refers to the time period specified in the broadband standard protocol.
  • a first parameter calculation module 1302 for use of the narrowband sampling rate f narrowband IQ data 's and the wideband frequency f SF obtain for each carrier the narrowband narrowband antenna IQ number of sampling points S' and N 'IQ sample a number of narrow-band of said narrow-band antenna can be mapped to a carrier wideband time slice K'.
  • the second parameter calculation module 1303 is configured to calculate, according to the number S′ of the narrowband IQ sampling points, the number K′ of the broadband time slices, and the bandwidth N tti of the broadband, The number of narrow-band IQ sample points N SAxC .
  • the second dividing module 1305 is configured to divide the narrowband sampling groups corresponding to the N′ A narrowband antenna carriers into a plurality of mapped sampling point groups in units of a preset number of narrowband sampling groups.
  • the synchronization sequence obtaining module 1306 is configured to acquire a synchronization sequence corresponding to each of the mapping sample point groups, and use a synchronization sequence corresponding to a mapping sample point group as a baseband sampling point group, where the synchronization sequence includes a corresponding sequence.
  • Each narrow-band IQ sample point in the mapped sample point group is narrow With position information in the antenna carrier.
  • Narrowband mapping module 1307 for the N 'A narrowband antenna-carrier mapping set of samples corresponding baseband set of samples mapped to broadband K' broadband time slice, wherein, the K 'broadband baseband sampling point number of the time slice group can accommodate greater or equal to the number of baseband sampling point groups' a narrow-band antenna-carrier narrowband IQ samples corresponding to the N.
  • the broadband mapping module 1308 is configured to map the narrowband IQ sampling points into the basic frame of the general public radio interface in units of the mapped K'th broadband time slices, to complete the narrowband IQ sampling points in the common public wireless interface. Mapping.
  • the narrowband mapping module 1307 includes:
  • a calculation interval unit configured to calculate K′ according to the bandwidth N tti of the broadband, the number K′ of the wide-band time slices, and the number S′ of narrow-band IQ sampling points corresponding to each of the narrow-band antenna carriers The interval of the adjacent two baseband sampling point groups mapped in the wide-band time slice N g-gap ; the mapping unit is configured to map the baseband sampling point groups corresponding to the N' A narrow-band antenna carriers according to the interval N g-gap In K's broadband time slices.
  • the data mapping apparatus further includes: a calculation maximum capacity module, configured, according to the interval N g-gap , a bit width N SAxC of the synchronization sequence, and a narrow band included in each of the narrowband sampling point groups
  • the number of IQ sampling points N SAxC calculate the maximum number of narrow-band sampling point groups N C-AxC that can be accommodated in the length of each of the intervals N g-gap in the K′ wide-band time slice; determine the preset number of modules And determining, by the number of narrowband antenna carriers that are less than or equal to the maximum number of narrowband sampling point groups N C-AxC , as the preset number.
  • calculate the maximum capacity module specifically for:
  • the calculating interval unit is specifically configured to:
  • GCD represents the calculation of the greatest common divisor of the two.
  • the synchronization sequence includes a slot count portion and a sample count portion
  • the synchronization sequence includes:
  • a bit width determining unit configured to determine a bit width of the synchronization sequence as:
  • CEIL is an up-rounding function
  • M i is the number of bits in the i-th counting period
  • i is a positive integer greater than or equal to 0 and less than or equal to N-1
  • N is the total number of counting periods of narrow-band antenna carriers to be transmitted.
  • 2M is the number of bits of a narrow-band IQ sample point.
  • a synchronization information filling unit configured to fill in the time slot counting portion and the location of the synchronization sequence according to position information of each narrowband IQ sampling point in the narrowband antenna carrier in the mapped sampling point group corresponding to the synchronization sequence Describe the point count section.
  • the second parameter calculation module 1303 is specifically configured to:
  • GCD represents the calculation of the greatest common divisor of the two.
  • the embodiment of the present invention further provides a data mapping device, and the working principle thereof is described in detail below with reference to the accompanying drawings.
  • FIG. 14 is a structural block diagram of a data mapping device according to an embodiment of the present disclosure.
  • the data mapping device includes: a processor 1401 and a memory 1402.
  • the processor 1401 communicates with the memory 1402 through a communication bus 1403, where:
  • the memory 1402 is configured to store the processor executable instructions.
  • processor is configured to:
  • the narrowband IQ sample points are mapped into the basic frame of the general public radio interface in units of the mapped K'th broadband time slices to complete mapping of the narrowband IQ sample points in the general public radio interface.
  • the processor maps the baseband sampling point group corresponding to the mapped sampling point group of the N′ A narrowband antenna carriers to the wide-band K′ broadband time slice, specifically, the method is:
  • the processor is also used to:
  • the processor calculates K according to the interval N g-gap , the bit width N SAxC of the synchronization sequence, and the number N SAxC of narrow-band IQ sampling points included in each of the narrow-band sampling point groups.
  • the maximum number of narrow-band sampling point groups N C-AxC that each of the intervals N g-gap can accommodate in a wide-band time slice is specifically used for:
  • the processor calculates K according to the bandwidth N tti of the broadband, the number K′ of the wide-band time slices, and the number S′ of narrow-band IQ sampling points corresponding to each of the narrow-band antenna carriers.
  • N g-gap the interval between two adjacent baseband sampling point groups mapped in a wide-band time slice.
  • GCD represents the calculation of the greatest common divisor of the two.
  • the synchronization sequence includes a slot count portion and a sample count portion.
  • the processor obtains the synchronization sequence corresponding to each of the mapped sample point groups, the processor is specifically configured to:
  • Determining the bit width of the synchronization sequence is:
  • CEIL is an up-rounding function
  • M i is the number of bits in the i-th counting period, i is a positive integer greater than or equal to 0 and less than or equal to N-1, and N is the total number of counting periods of narrow-band antenna carriers to be transmitted.
  • 2M is the number of bits of a narrow-band IQ sampling point;
  • the processor calculates the narrowband IQ included in the narrowband sampling point group according to the number S′ of the narrowband IQ sampling points, the number K′ of the wideband time slices, and the bandwidth N tti of the broadband.
  • N SAxC it is specifically used to:
  • GCD represents the calculation of the greatest common divisor of the two.
  • the above processor may be a microprocessor or the processor may be any conventional processor.
  • the steps of the method disclosed in the embodiments of the present invention may be directly embodied as a hardware processor. Execution is complete, or it is done with a combination of hardware and software modules in the processor.
  • the code implementing the above functions may be stored in a computer readable medium.
  • Computer readable media includes computer storage media. A storage medium may be any available media that can be accessed by a computer.
  • the computer readable medium may be a random access memory (English full name is random access memory, abbreviated as RAM), read-only memory (English full name is read-only memory, English abbreviation for ROM), Electrical erasable programmable read-only memory (English full name electrically erasable programmable read-only memory, abbreviated as EEPROM), read-only optical disc (English full name compact disc read-only memory, English abbreviation for CD-ROM) or other disc
  • RAM random access memory
  • read-only memory English full name is read-only memory, English abbreviation for ROM
  • Electrical erasable programmable read-only memory English full name electrically erasable programmable read-only memory, abbreviated as EEPROM
  • read-only optical disc English full name compact disc read-only memory, English abbreviation for CD-ROM
  • the computer readable medium may be a compact disc (English full name compact disc, abbreviated as CD), a laser disc, a digital video disc (English full name digital video disc, abbreviated as DVD), a floppy disk or a Blu-ray disc.

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Abstract

本申请实施例提供了一种数据映射方法、装置及设备，该方法首先将窄带的N'A个窄带天线载波对应的窄带IQ采样点进行捆绑分组，得到窄带采样点组，将预设数目个窄带采样点组作为一映射窄带采样点组，将映射窄带采样点组以及与其对应的同步序列作为一基带采样点组，将N'A个窄带天线载波对应的基带采样点组映射到宽带的K'个宽带的时间片中，然后再以映射后的K'个宽带的时间片为单位，将窄带的窄带IQ采样点映射到通用公共无线接口的基本帧中。利用本申请实施例中的技术方案，可以使得CPRI同时传输宽带和窄带数据，从而实现了宽窄带数据的兼容传输，提高了现有CPRI的适应性和利用率。

Description

数据映射方法、装置及设备 技术领域
本发明涉及通信领域，尤其涉及一种数据映射方法、装置及设备。
背景技术
随着移动通信技术的不断进步，无线通信的网络架构也在不断向前演进，以基带和射频分离为主要特征的基站系统已经成为公网基站，尤其是长期演进(Long Term Evolution，LTE)基站为主要形态，即基站系统为分布式的射频系统。在基带单元(Base Band Unit，BBU)和远程射频单元(Remote Radio Unit，RRU)呈分布式的射频系统中，通用公共无线接口(Common Public Radio Interface，CPRI)是BBU所在的无线设备控制中心(Radio Equipment Control，REC)，与RRU所在的无线设备(Radio Equipment，RE)之间进行交互的标准接口。由于CPRI具有标准化、传输速率高、延迟小等特征，因而成为公网基站中REC和RE的常用接口，接口的传输协议称为CPRI协议。图1为CPRI的基本配置图，除了REC和RE，CPRI系统还包括CPRI链路。图2为CPRI协议的分层结构图，该图示出CPRI协议分为两层：物理层和数据链路层。通常，REC与RE之间的数字基带调制信号通过数据链路层中的同向/正交(in-phase/Quadrature-phase，IQ)两个分量的数据流(简称IQ数据)通道进行传输。若REC向RE传输IQ数据，那么REC称为数据传输方，RE称为数据接收方；若RE向REC传输IQ数据，那么RE称为数据传输方，REC称为数据接收方。不管是哪一方是数据传输方，哪一方是数据接收方，在对IQ数据进行传输之前，都需要进行IQ数据映射，其目的在于使得IQ数据按照CPRI的传输要求进行传输。
在现有的CPRI协议中提出了三种IQ数据映射方法：基于IQ采样点(IQ sample based)、基于符号(symbol based)和向后兼容(backward compatible)。其中第三种IQ数据映射的基本思路为：将宽带的NA个天线载波(Antenna-carrier，简称AxC)的宽带IQ采样点(IQ samples) 均匀的分配在K个基本帧中，每个AxC具有相同的特性(位宽、采样速率均相同)，且每个AxC都分别对应S个宽带IQ采样点。基本帧是CPRI传输的基本单位，NA·S个宽带IQ采样点对应的时间和K个基本帧的时间相同。一个基本帧对应一个AxC容器(AxC Container)，因此一个AxC容器的大小NC需要满足至少能承载
Figure PCTCN2016101132-appb-000001
个采样点的条件。若NA·S个宽带IQ采样点没有把K个基本帧中的AxC容器填满，AxC容器中剩余的容量由无效采样点填充。协议中给出了S和K的计算方式，即：
Figure PCTCN2016101132-appb-000002
其中，fs为宽带IQ数据的采样速率，fc为CPRI基本帧速率，固定为3.84MHz，LCM为计算最小公倍数的函数。
目前，集群专网由于技术发展相对缓慢，传统的窄带系统，例如数字集群PDT、数字移动无线电标准DMR、Tetra(Trans European Trunked Radio，泛欧集群无线电)等，还在使用一体式基站架构，即BBU和RRU合为一体的架构，随着系统宽带LTE的演进，必然要采用BBU和RRU分离的架构。这就涉及到窄带数据在CPRI中的容纳和传输问题，而公网的CPRI接口协议是无法直接用在集群专网中的，因为在计算S个宽带IQ采样点(或窄带IQ采样点)对应的基本帧的个数K时，窄带计算得到的数值要远远高于宽带计算得到的数值。而在公网制式下，对映射参数K的配置通常较小(例如在50以内)，以至于现有的CPRI无法传输窄带的窄带IQ数据。
所以，目前需要出现一种能够兼容传输窄带IQ数据和宽带IQ数据的数据映射方法。
发明内容
为了解决现有技术存在的技术问题，本发明提供一种数据映射方法、装置及设备，实现了在不改变CPRI的前提下能够传输窄带IQ数据的目的。
一种数据映射方法，包括：
获取窄带的窄带IQ数据的采样速率f's、宽带的频率fsf以及窄带天线载波数量N'A，所述宽带的频率为时间片的倒数，所述时间片是指宽带制式协议中规定的时间周期；
利用所述窄带的窄带IQ数据的采样速率f's和所述宽带的频率fsf得到每个所述窄带天线载波对应的窄带IQ采样点的个数S'，以及N'A个所述窄带天线载波的窄带IQ采样点能够映射到的宽带的时间片的个数K'；
依据所述窄带IQ采样点的个数S'、所述宽带的时间片的个数K'和所述宽带的带宽Ntti，计算出窄带采样点组包含的窄带IQ采样点的个数NSAxC；
将所述N'A个窄带天线载波的窄带IQ采样点，以NSAxC个IQ采样点为单位，划分为多个窄带采样点组；
将N'A个窄带天线载波对应的窄带采样组中，以预设数目个窄带采样点组为单位，划分成多个映射采样点组；
获取每一所述映射采样点组对应的同步序列，将一映射采样点组与其自身对应的同步序列作为一基带采样点组，所述同步序列包括与其对应的所述映射采样点组中各个窄带IQ采样点在窄带天线载波中的位置信息；
将所述N'A个窄带天线载波的映射采样点组对应的基带采样点组，映射到K'个宽带的时间片中，其中，所述K'个宽带的时间片所能容纳的基带采样点组的数量大于或等于所述N'A个窄带天线载波的窄带IQ采样点对应的基带采样点组的数量；
以映射后的K'个宽带的时间片为单位，将窄带IQ采样点映射到通用公共无线接口的基本帧中，以完成对窄带IQ采样点在通用公共无线接口中的映射。
其中，所述将所述N'A个窄带天线载波的映射采样点组对应的基带采样点组，映射到宽带的K'个宽带的时间片中包括：
依据所述宽带的带宽Ntti、所述宽带的时间片的个数K'以及每个所述窄带天线载波对应的窄带IQ采样点的个数S'，计算出K'个宽带的时间片中映射的相邻两个基带采样点组的间隔Ng-gap；
将N'A个窄带天线载波对应的基带采样点组按照间隔Ng-gap，映射在K'个宽带的时间片中。
其中，所述预设数目的确定方法包括：
依据所述间隔Ng-gap，所述同步序列的位宽NSAxC，以及每一所述窄带采样点组包含的窄带IQ采样点的个数NSAxC，计算出K'个宽带的时间片中每一 所述间隔Ng-gap的长度所能容纳的最大窄带采样点组数目NC-AxC；
将一小于等于所述最大窄带采样点组数目NC-AxC的窄带天线载波数目，确定为所述预设数目。
其中，所述依据所述间隔Ng-gap，所述同步序列的位宽NSAxC，以及每一所述窄带采样点组包含的窄带IQ采样点的个数NSAxC，计算出K'个宽带的时间片中每一所述间隔Ng-gap的长度所能容纳的最大窄带采样点组数目NC-AxC包括：
Figure PCTCN2016101132-appb-000003
其中，
Figure PCTCN2016101132-appb-000004
为向下取整符号。
其中，所述依据所述宽带的带宽Ntti、所述宽带的时间片的个数K'以及每个所述窄带天线载波对应的窄带IQ采样点的个数S'，计算出K'个宽带的时间片中映射的相邻两个基带采样点组的间隔Ng-gap包括：
Figure PCTCN2016101132-appb-000005
其中，GCD表示计算两者的最大公约数。
其中，所述同步序列包括时隙计数部分和样点计数部分，所述获取每一所述映射采样点组对应的同步序列包括：
确定所述同步序列的位宽为：
Figure PCTCN2016101132-appb-000006
其中，CEIL为向上取整函数；Mi为第i个计数周期的比特数，i为大于等于0小于等于N-1的正整数，N为需要传输的窄带天线载波的计数周期的总个数；2M为一个窄带IQ采样点的比特数；
依据与所述同步序列对应的所述映射采样点组中各个窄带IQ采样点在窄带天线载波中的位置信息，填写所述同步序列的所述时隙计数部分和所述样点计数部分。
其中，所述依据所述窄带IQ采样点的个数S'、所述宽带的时间片的个数K'和所述宽带的带宽Ntti，计算出窄带采样点组包含的窄带IQ采样点的个 数NSAxC包括：
Figure PCTCN2016101132-appb-000007
其中，GCD表示计算两者的最大公约数。
一种数据映射装置，包括：
参数获取模块，用于获取窄带的窄带IQ数据的采样速率f's、宽带的频率fsf以及窄带天线载波数量N'A，所述宽带的频率为时间片的倒数，所述时间片是指宽带制式协议中规定的时间周期；
第一参数计算模块，用于利用所述窄带的窄带IQ数据的采样速率f's和所述宽带的频率fsf得到每个所述窄带天线载波对应的窄带IQ采样点的个数S'，以及N'A个所述窄带天线载波的窄带IQ采样点能够映射到的宽带的时间片的个数K'；
第二参数计算模块，用于依据所述窄带IQ采样点的个数S'、所述宽带的时间片的个数K'和所述宽带的带宽Ntti，计算出窄带采样点组包含的窄带IQ采样点的个数NSAxC；
第一划分模块，用于将所述N'A个窄带天线载波的窄带IQ采样点，以NSAxC个IQ采样点为单位，划分为多个窄带采样点组；
第二划分模块，用于将N'A个窄带天线载波对应的窄带采样组中，以预设数目个窄带采样组为单位，划分成多个映射采样点组；
同步序列获取模块，用于获取每一所述映射采样点组对应的同步序列，将一映射采样点组与其自身对应的同步序列作为一基带采样点组，所述同步序列包括与其对应的所述映射采样点组中各个窄带IQ采样点在窄带天线载波中的位置信息；
窄带映射模块，用于将所述N'A个窄带天线载波的映射采样点组对应的基带采样点组，映射到宽带的K'个宽带的时间片中，其中，所述K'个宽带的时间片所能容纳的基带采样点组的数量大于或等于所述N'A个窄带天线载波的窄带IQ采样点对应的基带采样点组的数量；
宽带映射模块，用于以映射后的K'个宽带的时间片为单位，将窄带IQ采样点映射到通用公共无线接口的基本帧中，以完成对窄带IQ采样点在通 用公共无线接口中的映射。
其中，所述同步序列包括时隙计数部分和样点计数部分，所述同步序列获取模块包括：
位宽确定单元，用于确定所述同步序列的位宽为：
Figure PCTCN2016101132-appb-000008
其中，CEIL为向上取整函数；Mi为第i个计数周期的比特数，i为大于等于0小于等于N-1的正整数，N为需要传输的窄带天线载波的计数周期的总个数；2M为一个窄带IQ采样点的比特数；
同步信息填充单元，用于依据与所述同步序列对应的所述映射采样点组中各个窄带IQ采样点在窄带天线载波中的位置信息，填写所述同步序列的所述时隙计数部分和所述样点计数部分。
一种数据映射设备，包括：
处理器；
用于存储所述处理器可执行指令的存储器；
其中，所述处理器被配置为：
获取窄带的窄带IQ数据的采样速率f's、宽带的频率fsf以及窄带天线载波数量N'A，所述宽带的频率为时间片的倒数，所述时间片是指宽带制式协议中规定的时间周期；
利用所述窄带的窄带IQ数据的采样速率f's和所述宽带的频率fsf得到每个所述窄带天线载波对应的窄带IQ采样点的个数S'，以及N'A个所述窄带天线载波的窄带IQ采样点能够映射到的宽带的时间片的个数K'；
依据所述窄带IQ采样点的个数S'、所述宽带的时间片的个数K'和所述宽带的带宽Ntti，计算出窄带采样点组包含的窄带IQ采样点的个数NSAxC；
将所述N'A个窄带天线载波的窄带IQ采样点，以NSAxC个IQ采样点为单位，划分为多个窄带采样点组；
将N'A个窄带天线载波对应的窄带采样组中，以预设数目个窄带采样点组为单位，划分成多个映射采样点组；
获取每一所述映射采样点组对应的同步序列，将一映射采样点组与其 自身对应的同步序列作为一基带采样点组，所述同步序列包括与其对应的所述映射采样点组中各个窄带IQ采样点在窄带天线载波中的位置信息；
将所述N'A个窄带天线载波的映射采样点组对应的基带采样点组，映射到K'个宽带的时间片中，其中，所述K'个宽带的时间片所能容纳的基带采样点组的数量大于或等于所述N'A个窄带天线载波的窄带IQ采样点对应的基带采样点组的数量；
以映射后的K'个宽带的时间片为单位，将窄带IQ采样点映射到通用公共无线接口的基本帧中，以完成对窄带IQ采样点在通用公共无线接口中的映射。
本发明通过获取窄带的窄带IQ数据的采样速率f's、宽带的频率fsf以及窄带的天线载波数量N'A，并利用所述窄带的窄带IQ数据的采样速率f's和所述宽带的频率fsf得到每个所述窄带天线载波对应的窄带IQ采样点的个数S'，以及N'A个窄带天线载波的窄带IQ采样点能够映射到的宽带的时间片的个数K'，以将窄带的N'A个天线载波的窄带IQ采样点映射到宽带的K'个宽带的时间片中，实现了将窄带IQ数据映射到宽带IQ数据的目的，然后以映射后的K'个宽带的时间片为单位，将窄带的IQ采样点映射到通用公共无线接口的基本帧中，以完成对窄带IQ采样点在通用公共无线接口中的映射。利用本申请实施例中的技术方案，CPRI可以同时传输宽带IQ数据和窄带IQ数据，从而实现了宽窄带数据的兼容传输，提高了现有CPRI的适应性和利用率。
为了保证N'A个窄带天线载波的窄带IQ采样点能够均匀的映射至K'个宽带的时间片中，对窄带IQ采样点进行了分组捆绑处理，即将N'A个窄带天线载波的窄带IQ采样点，划分为多个窄带采样点组。为了能够使得数据接收方能够正常解析数据传输方传输的携带窄带IQ数据的宽带的基本帧，本申请实施例还为每预设数目个窄带采样组，即一映射采样点组设置一同步序列，同步序列包括与其对应的所述映射采样点组中各个窄带IQ采样点在窄带天线载波中的位置信息，从而能够使得数据接收方，依据同步序列准确的解析并还原基本帧中的窄带的IQ数据。
附图说明
为了更清楚地说明本发明实施例或现有技术中的技术方案，下面将对实施例或现有技术描述中所需要使用的附图作简单地介绍，显而易见地，下面描述中的附图仅仅是本发明的一些实施例，对于本领域普通技术人员来讲，在不付出创造性劳动的前提下，还可以根据这些附图获得其他的附图。
图1为CPRI的基本配置图；
图2为CPRI协议的分层结构图；
图3为本申请实施例提供的一种数据映射方法的一种实现方式的流程示意图；
图4为同步序列的一种实现方式的示意图；
图5为本申请实施例提供的一种将N'A个窄带天线载波对应的基带采样点组按照间隔Ng-gap，映射在K'个宽带的时间片中的帧结构示意图；
图6为本申请实施例提供的一种CPRI接口的协议层的示意图；
图7为PDT制式的帧结构图；
图8为PDT的基带调制过程图；
图9为同步序列的另一种实现方式的示意图；
图10为同步序列的详细示意图；
图11为本申请实施例提供的一种将4个窄带天线载波对应的基带采样点组按照间隔800，映射在5个宽带的时间片中的帧结构示意图；
图12为本申请实施例提供的一种数据映射方法中宽窄带数据兼容传输的LTE天线载波复用示意图；
图13为本申请实施例提供的一种数据映射装置的结构框图；
图14为本实施例提供的一种数据映射设备的结构框图。
具体实施方式
下面将结合本发明实施例中的附图，对本发明实施例中的技术方案进行清楚、完整地描述，显然，所描述的实施例仅仅是本发明一部分实施例，而不是全部的实施例。基于本发明中的实施例，本领域普通技术人员在没 有做出创造性劳动前提下所获得的所有其他实施例，都属于本发明保护的范围。
现有技术的CPRI协议给出了基于宽带的宽带IQ数据映射方法，其基本思想为：将宽带的NA个天线载波(Antenna-carrier，简称AxC)的宽带IQ采样点(IQ samples)均匀的分配在K个基本帧中，并给出了每个AxC对应的宽带IQ采样点的个数S，以及NA个天线载波(Antenna-carrier，简称AxC)的宽带IQ采样点对应的基本帧个数K的计算公式。一般来说，基于宽带的宽带IQ数据传输计算得到的基本帧个数K只有个位数，而若将该公式直接应用在对窄带的窄带IQ数据映射，则计算得到的基本帧的个数K要远远高于基于宽带的宽带IQ数据传输计算得到的基本帧个数。
举个例子，假设宽带的宽带IQ数据的采样速率fs＝30.72MHz，由于fc为定值3.84MHz，因此有LCM(fs,fc)＝30.72MHz，进而可以得到:
Figure PCTCN2016101132-appb-000009
假设窄带的窄带IQ数据的采样速率为fs＝38.4KHz＝3.84×10-2MHz，由于fc为定值3.84MHz，因此有LCM(fs,fc)＝3.84MHz，进而可以得到：
Figure PCTCN2016101132-appb-000010
可见传输窄带IQ数据的K值和传输宽带IQ数据的K值相差很大，现有的CPRI不适用于窄带IQ数据的传输。
为了克服这个技术问题，发明人提出了一种数据映射方法，其基本思路为：首先将窄带的N'A个窄带天线载波对应的窄带IQ采样点映射到宽带的K'个宽带的时间片中，然后再以映射后的K'个宽带的时间片为单位，将窄带的窄带IQ采样点映射到通用公共无线接口的基本帧中。也就是说，先将窄带的窄带IQ采样点“包装”成宽带的宽带IQ采样点，然后利用现有技术中对宽带IQ采样点的映射方法进行映射，这样就可以采用现有的CPRI对窄带IQ数据继续传输，利用本申请实施例中的技术方案，可以使得CPRI同时传输宽带和窄带数据，从而实现了宽窄带数据的兼容传输，提高了现有CPRI的适应性和利用率。
为了使本技术领域的人员更好地理解本发明方案，下面将结合本发明实施例中的附图，对本发明实施例中的技术方案进行清楚、完整地描述，显然，所描述的实施例仅是本发明一部分实施例，而不是全部的实施例。基于本发明中的实施例，本领域普通技术人员在没有做出创造性劳动前提下所获得的所有其他实施例，都属于本发明保护的范围。
参阅图3，为本申请实施例提供的一种数据映射方法的一种实现方式的流程示意图，该方法包括：
步骤S301：获取窄带的窄带IQ数据的采样速率f's、宽带的频率fsf以及窄带天线载波数量N'A。
所述宽带的频率为时间片的倒数，所述时间片是指宽带制式协议中规定的时间周期。
所述宽带的频率为时间片的倒数，所述时间片是指宽带制式协议中规定的时间周期，例如子帧、时隙、无线帧、OFDM(Orthogonal Frequency Division Multiplexing，正交频分复用)符号等。
步骤S302：利用所述窄带的窄带IQ数据的采样速率f's和所述宽带的频率fsf得到每个所述窄带天线载波对应的窄带IQ采样点的个数S'，以及N'A个窄带天线载波的窄带IQ采样点能够映射到的宽带的时间片的个数K'。
在本实施例中，所述每个所述窄带天线载波对应的窄带IQ采样点的个数S'可以通过如下公式得到：
Figure PCTCN2016101132-appb-000011
其中，所述LCM为计算最小公倍数的函数。
所述N'A个天线载波的窄带IQ采样点能够映射到的宽带的时间片的个数K'可以通过如下公式得到：
Figure PCTCN2016101132-appb-000012
其中，所述LCM为计算最小公倍数的函数。
需要注意的是，上述两个公式并不构成对本发明的限定，本领域技术人员可以根据本发明提供的技术思想结合实际应用需求自行设计。
步骤S303：依据所述窄带IQ采样点的个数S'、所述宽带的时间片的个数K'和所述宽带的带宽Ntti，计算出窄带采样点组包含的窄带IQ采样点的个数NSAxC。
在本实施例中，NSAxC可以通过如下公式得到：
Figure PCTCN2016101132-appb-000013
其中，GCD表示计算两者的最大公约数。
需要注意的是，上述公式并不构成对本发明的限定，本领域技术人员可以根据本发明提供的技术思想结合实际应用需求自行设计。
步骤S304：将所述N'A个窄带天线载波的窄带IQ采样点，以NSAxC个IQ采样点为单位，划分为多个窄带采样点组。
N'A个窄带天线载波被划分的窄带采样点组的个数
Figure PCTCN2016101132-appb-000014
步骤S305：将N'A个窄带天线载波对应的窄带采样组中，以预设数目个窄带采样组为单位，划分成多个映射采样点组。
预设数目的确定方法包括：
依据所述间隔Ng-gap，所述同步序列的位宽NSAxC，以及每一所述窄带采样点组包含的窄带IQ采样点的个数NSAxC，计算出K'个宽带的时间片中每一所述间隔Ng-gap的长度所能容纳的最大窄带采样点组数目NC-AxC。将一小于等于所述最大窄带采样点组数目NC-AxC的窄带天线载波数目，确定为所述预设数目。
在本实施例中，NSAxC和Ng-gap可以通过如下公式得到：
Figure PCTCN2016101132-appb-000015
其中，
Figure PCTCN2016101132-appb-000016
为向下取整符号。
Figure PCTCN2016101132-appb-000017
其中，GCD表示计算两者的最大公约数，Ntti为宽带的带宽。
需要注意的是，上述公式并不构成对本发明的限定，本领域技术人员可以根据本发明提供的技术思想结合实际应用需求自行设计。
步骤S306：获取每一所述映射采样点组对应的同步序列，将一映射采样点组与其自身对应的同步序列作为一基带采样点组。
所述同步序列包括与其对应的所述映射采样点组中各个窄带IQ采样点在窄带天线载波中的位置信息。
同步序列SYNC是窄带天线载波的同步标识，用于记录和传输各个窄带IQ采样点在窄带天线载波中的位置信息，用于数据接收方的帧时序恢复。同步序列可以如图4所示，同步序列SYNC位宽的NSYNC可为一个或多个窄带IQ采样点的比特数，这取决于其比特长度是否能够容纳窄带天线载波整个周期的计数。
具体的，确定所述同步序列的位宽为：
Figure PCTCN2016101132-appb-000018
其中，CEIL为向上取整函数；Mi为第i个计数周期的比特数，i为大于等于0小于等于N-1的正整数，N为需要传输的窄带天线载波的计数周期的总个数；2M为一个窄带IQ采样点的比特数。
依据与所述同步序列对应的所述映射采样点组中各个窄带IQ采样点在窄带天线载波中的位置信息，填写所述同步序列的所述时隙计数部分和所述样点计数部分。
步骤S307：将所述N'A个窄带天线载波的映射采样点组对应的基带采样点组，映射到宽带的K'个宽带的时间片中，其中，所述K'个宽带的时间片所能容纳的基带采样点组的数量大于或等于所述N'A个窄带天线载波的窄带IQ采样点对应的基带采样点组的数量。
在实际应用中，若K'个宽带的时间片所能容纳的基带采样点组的数量大于所述N'A个天线载波的基带采样点组数量，则可以将K'个宽带的时间片中剩余的采样点容量用无效IQ采样点填充，所述K'个宽带的时间片中剩余的采样点容量为K'个宽带的时间片所能容纳的窄带IQ采样点数与所述N'A个天线载波的窄带IQ采样点数量之差。
步骤S308：以映射后的K'个宽带的时间片为单位，将窄带IQ采样点映射到通用公共无线接口的基本帧中，以完成对窄带IQ采样点在通用公共无线接口中的映射。
本发明通过获取窄带的窄带IQ数据的采样速率f's、宽带的频率fsf以及窄带的天线载波数量N'A，并利用所述窄带的窄带IQ数据的采样速率f's和所述宽带的频率fsf得到每个所述窄带天线载波对应的窄带IQ采样点的个数S'，以及N'A个窄带天线载波的窄带IQ采样点能够映射到的宽带的时间片的个数K'，以将窄带的N'A个天线载波的窄带IQ采样点映射到宽带的K'个宽带的时间片中，实现了将窄带IQ数据映射到宽带IQ数据的目的，然后以映射后的K'个宽带的时间片为单位，将窄带的IQ采样点映射到通用公共无线接口的基本帧中，以完成对窄带IQ采样点在通用公共无线接口中的映射。利用本申请实施例中的技术方案，CPRI可以同时传输宽带IQ数据和窄带IQ数据，从而实现了宽窄带数据的兼容传输，提高了现有CPRI的适应性和利用率。
为了保证N'A个窄带天线载波的窄带IQ采样点能够均匀的映射至K'个宽带的时间片中，对窄带IQ采样点进行了分组捆绑处理，即将N'A个窄带天线载波的窄带IQ采样点，划分为多个窄带采样点组。为了能够使得数据接收方能够正常解析数据传输方传输的携带窄带IQ数据的宽带的基本帧，本申请实施例还为每预设数目个窄带采样组，即一映射采样点组设置一同步序列，同步序列包括与其对应的所述映射采样点组中各个窄带IQ采样点在窄带天线载波中的位置信息，从而能够使得数据接收方，依据同步序列准确的解析并还原基本帧中的窄带的IQ数据。
为本申请实施例还提供的一种数据映射方法中的将所述N'A个窄带天线载波的映射采样点组对应的基带采样点组，映射到宽带的K'个宽带的时间片中的一种实现方法，该方法包括：
依据所述宽带的带宽Ntti、所述宽带的时间片的个数K'以及每个所述窄带天线载波对应的窄带IQ采样点的个数S'，计算出K'个宽带的时间片中映射的相邻两个基带采样点组SAxC Group的间隔Ng-gap。
将N'A个窄带天线载波对应的基带采样点组按照间隔Ng-gap，映射在K' 个子时间片中。
如图5所示，为本申请实施例提供的一种将N'A个窄带天线载波对应的基带采样点组按照间隔Ng-gap，映射在K'个宽带的时间片中的帧结构示意图。
图5为窄带天线载波的窄带IQ采样点和所述无效IQ采样点填充在K'个宽带的时间片中的其中一种方式，即窄带天线载波的窄带IQ采样点集中在一起，无效IQ采样点集中在一起。在实际应用中，还可以有其他的填充方式，例如各个窄带天线载波的窄带IQ采样点与无效IQ采样点间隔开来填充，每个间隔填充的无效IQ采样点的数量可以相同。
图5中Pading部分填充了无效IQ采样点。
每一基带采样点组SAxC Group包括一同步序列SYNC，以及多个窄带采样点组，可选的，可以从每一窄带天线载波中选取一个或多个窄带采样点组，将各个窄带天线载波中一个或多个窄带采样点组作为一映射窄带采样点组。图5中示出的，是从每一窄带天线载波中选取一个窄带采样点组，则每一映射窄带采样点组包括N'A个窄带采样点组，将第r个窄带天线载波对应的窄带采样点组称为SAxCr，则SAxC Group包括的窄带采样点组分别为：SAxC0、SAxC1、SAxC2，…，SAxC(N'A-1)。
本申请实施例中可以将窄带天线载波以均匀的时间间隔装载至K'个宽带的时间片中，使得传输延时最小化，以K'个宽带的时间片为基本单位，可以保证兼容传输的同时，也为数据同步提供了便利。
本实施例通过结合实际应用场景来介绍本发明提供的数据映射方法。在该实施例中，所述窄带为PDT(Police Digital Trunking或Public Digital Trunking，警用数字集群系统或公共数字集群)制式，所述宽带为LTE(Long Term Evolution，长期演进)制式，本实施例不仅要实现对PDT制式的窄带IQ数据的传输，而且还要实现PDT制式的窄带IQ数据与所述LTE制式的宽带IQ数据的兼容传输。
为了更好的理解本实施例提供的数据映射方法，首先介绍一下PDT集群制式的帧格式和窄带IQ数据格式。参见图6，该图为PDT制式的帧结构，在该帧结构中，60ms被划分成2个时隙，每个时隙长度为30ms。一个时隙由三分部组成：同步或内嵌信令、语音或数据以及CACH(下 行)或保护间隔(上行)。每一帧数据包括144个OFDM符号，符号速率为4800Hz，由于是采用4FSK(Frequency-shift keying，移频键控)调制，每个时隙承载288bit比特有效数据。
PDT的基带调制过程图7所示，即首先将每2比特数据映射成调制符号，然后对调制符号进行上采样和成形滤波，最后经进频率调制生成窄带IQ数据，即基带信号。经过调制后，窄带IQ数据在符号速率之上进行了一定倍数的上采样。本实施样例中以8倍采样率为例，即f's＝8×4800Hz＝38400Hz的窄带IQ采样速率，当然实际中也可以使用其它采样速率。此外，假设PDT的天线载波数量N'A＝4。
本实施例以LTE子帧作为时间片，每个子帧时间长度为1ms，因此子帧的频率fsf为1000Hz(单个子帧时间长度的倒数)。若要将PDT的4个天线载波的窄带IQ采样点装入LTE的K'个子帧中进行传输，则应当满足如下条件：
Figure PCTCN2016101132-appb-000019
其中，PDT的每个天线载波对应S'个窄带IQ采样点。
因为S'和K'只能取整数，因此需要将小数的f's进行处理，也就是在计算f's和fsf的最小公倍数时，将f's乘以10，相应的，也需要将fsf乘以10。
S'和K'可以通过如下公式得到：
Figure PCTCN2016101132-appb-000020
Figure PCTCN2016101132-appb-000021
其中，LCM为计算两者的最小公倍数。
每一所述窄带采样点组包含的窄带IQ采样点的个数可以根据以下公式得到：
Figure PCTCN2016101132-appb-000022
也就是，每一窄带天线载波包括192个窄带采样点组。
K'个子帧中容纳多个基带采样点组，其容纳的相邻的两个基带采样点组之间的间隔为：
Figure PCTCN2016101132-appb-000023
每一间隔Ng-gap长度能够映射的最大窄带采样点组数据为：
Figure PCTCN2016101132-appb-000024
本申请实施例，假设将预设数目取值为4，即从每一窄带天线载波中选取一窄带采样点组，即将4个不同窄带天线载波的窄带采样点组作为一个映射采样点组。
映射采样点组的同步序列的位宽计算方式如下：
根据PDT制式的窄带IQ数据，由于窄带IQ数据包括两个时隙(窄带天线载波的计数周期的总个数为2)；每个时隙144个符号，本实施样例中以8倍采样率为例，即f's＝38.4ksps的窄带IQ采样速率，则每个时隙的采样点数目为144*8＝1152(用11bit即可表示0至1151，因此第i个计数周期的比特数为11)。假设，CPRI线速率为4915.2Mbps，IQ采样位宽M＝15bit。
所述同步序列的位宽为：
Figure PCTCN2016101132-appb-000025
其中，CEIL为向上取整函数；Mi为第i个计数周期的比特数，i为大于等于0小于等于N-1的正整数，N为需要传输的窄带天线载波的计数周期的总个数；2M为一个窄带IQ采样点的比特数。
每一SAxC Group中的同步序列SYNC格式如图8所示，1152个采样点需要11bit才能表示，将11bit所在的部分称为样点计数部分。同步序列的前18bit可以为保留字段，第19bit为时隙计数部分，样点计数部分可以存放在同步序列的最低11位，有效范围0～1151。
同步序列是为了CPRI数据接收方和数据传输方根据同步序列 SNYC中带的序号即进行时序同步。
如图9所示，为本申请实施例提供的一种同步序列的具体实现方式的示意图。
每个所述窄带天线载波中的窄带IQ采样点，均按照“时隙计数，样点计数”方式排布。
为了能将PDT的4个天线载波中的IQ采样点映射到LTE的5个子帧中，需要保证这5个子帧所能容纳的PDT的IQ采样点大于或等于这四个天线载波中的IQ采样点。由于每个PDT的天线载波对应192个IQ采样点，那么4个天线载波一共对应192×4＝768个IQ采样点，因而需要保证5个子帧所能容纳最少768个IQ采样点。
LTE子帧所能容纳的PDT的采样点数可以根据LTE的OFDM符号的采样点数得到，而LTE的OFDM符号的采样点数可以根据LTE的带宽查表得到。假设所述LTE的带宽为20MHz，那么根据表1可以查到与所述带宽对应的OFDM符号的采样点Nsymbol为2048。
表1
带宽(MHz) 1.4 3 5 10 15 20
Nsymbol 128 256 512 1024 1536或2048 2048
一个LTE子帧所能容纳的采样点数Ntti根据如下公式得到：
Ntti＝15·Nsymbol＝15×2048＝30720
所以，本实施例中K'个子帧所能容纳的采样点数Ng根据如下公式得到：
Ng＝K'·Ntti＝5×30720＝153600
经过计算，本实施例中PDT的四个天线载波对应的IQ采样点的数量(768个)远远小于5个LTE子帧所能容纳的采样点数Ng(153600个)，因此可以实现PDT的IQ采样点与LTE子帧之间的映射。
每一所述窄带采样点组包含的窄带IQ采样点的个数可以根据以下公式得到：
Figure PCTCN2016101132-appb-000026
其中，GCD表示计算两者的最大公约数。
本申请实施例中一个基带采样点组的长度为同步序列长度与映射窄带采样点组的长度之和，即为34。
由于两个基带采样点组之间的间隔为Ng-gap，所以K'个宽带的时间片所能容纳的基带采样点组数据可以用如下公式计算：
Ng/Ng-gap＝153600/800＝192
将所述N'A个窄带天线载波的窄带IQ采样点映射到宽带的K'个宽带的时间片中，如图10所示(详细介绍可参见图5)，图9中，每一基带采样点组SAxC Group包括一同步序列以及4个窄带采样点组，这4个窄带采样点组(SAxC0、SAxC1、SAxC2、SAxC3)分别属于不同的窄带天线载波。
此外，还可以通过另外一种方式来验证K'个LTE子帧是否能容纳PDT的4个天线载波的IQ采样点。
每一间隔Ng-gap长度能够映射的最大窄带采样点组数据为：
Figure PCTCN2016101132-appb-000027
K'个LTE子帧所能容纳的窄带采样点组的最大个数NC即：
NC＝(Ng/Ng-gap)*NC-AxC＝192*770＝147840
也就是说，本实施例中5个LTE子帧所能复用的PDT的最多窄带采样点组的个数为147840个，远远超过实际PDT的窄带天线载波对应的窄带采样点组的数量(192*4＝768)，因此可以将PDT的4个天线载波的IQ采样点“装入”所述5个LTE子帧中。
在本实施例中，在将所述PDT4个天线载波的IQ采样点映射到5个LTE子帧中后，所述5个LTE子帧中剩余的采样点容量可以用无效IQ采样点填充，也就是说可以填充Ng-4×S'-192×NSAxC＝153600-4×192-192×30＝147072个无效IQ采样点，所述无效IQ采样点是指用于填充的IQ采样点，在发送端和接收端均可以忽略其内容。
在介绍了如何将PDT的IQ采样点映射到LTE子帧中后，下面介绍 如何进行宽窄带的数据兼容传输。
假设根据计算得到CPRI支持的LTE的天线载波个数NA为4，而实际需要传输的LTE IQ采样点只需要占用两个天线载波，那么就可以利用剩余两个天线载波中的一个来复用PDT的IQ采样点，另外一个为空闲保留。参见图11，AxC0(即LTE AxC#0)和AxC1(即LTE AxC#1)用于“装载”LTE的IQ采样点，AxC2(即LTE AxC#2)用于“装载”PDT的IQ采样点，这样的复用方式实现了宽窄带数据的兼容传输。
本申请实施例可以在CPRI接口的数据链路层上面设置适配层，本申请实施例提供的数据映射方法可以应用于CPRI接口，如图12所示，为本申请实施例提供的一种CPRI接口示意图。
适配层将窄带天线载波的窄带IQ采样点映射到宽带的时间片中，本申请实施例中认为窄带的窄带IQ数据和宽带的宽带IQ数据的采样位宽完全一致，均为2M，因此本申请实施例中关于窄带天线载波中窄带IQ采样点的大小、各个基带采样点组之间的间隔等等都是以窄带IQ采样点的比特数为单位。
数据链路层提供AxC通道进行IQ数据交互；适配层调用数据链路层的AxC通道，并在此基础上进行复用，得到多个SAxC通道。
本申请实施例中将宽带的时间片称为AxC(图12中以LTE AxC为例)，映射到AxC中的窄带天线载波为SAxC。从图12可以看出适配层将各个SAxC Group(包括SAxC0、SAxC1、SAxC2，…，SAxC(N'A-1)，如图5所示，在图12中仅示出了一个SAxC Group)复用到LTE AxC#0中，LTE AxC#0表示第一个宽带的时间片，LTE AxC#(K'-1)为第K'个宽带的时间片，CPRI接口的数据链路层，数据链路层中的复用是指，以映射后的K'个宽带的时间片为单位，将窄带IQ采样点映射到通用公共无线接口的基本帧中。
在实际应用中，若所述REC为数据传输方，所述RE为数据数据接收方，则上述数据映射方法可以由所述REC执行，所述REC可以通过C&M(Control and Management，控制和管理)通道将所述PDT的天线载波数N'A和所述PDT映射在所述LTE中的位置(例如AxC序号2)发送 给所述RE，并且所述REC和所述RE事先约定PDT的采样速率，所述RE在接收到上述参数后，可以根据上述参数得到所述PDT的IQ数据在LTE天线载波中的映射关系，以便根据所述映射关系接收来自所述REC发送的数据。若所述RE为数据传输方，所述REC为数据数据接收方，则同理。
基于以上实施例提供的一种数据映射方法，本发明实施例还提供了一种数据映射装置，下面结合附图来详细说明其工作原理。
参阅图13，为本申请实施例提供的一种数据映射装置的结构框图。
本实施例提供的数据映射装置包括：参数获取模块1301、第一参数计算模块1302、第二参数计算模块1303、第一划分模块1304、第二划分模块1305、同步序列获取模块1306、窄带映射模块1307以及宽带映射模块1308，其中：
参数获取模块1301，用于获取窄带的窄带IQ数据的采样速率f's、宽带的频率fsf以及窄带天线载波数量N'A，所述宽带的频率为时间片的倒数，所述时间片是指宽带制式协议中规定的时间周期。
第一参数计算模块1302，用于利用所述窄带的窄带IQ数据的采样速率f's和所述宽带的频率fsf得到每个所述窄带天线载波对应的窄带IQ采样点的个数S'，以及N'A个所述窄带天线载波的窄带IQ采样点能够映射到的宽带的时间片的个数K'。
第二参数计算模块1303，用于依据所述窄带IQ采样点的个数S'、所述宽带的时间片的个数K'和所述宽带的带宽Ntti，计算出窄带采样点组包含的窄带IQ采样点的个数NSAxC。
第一划分模块1304，用于将所述N'A个窄带天线载波的窄带IQ采样点，以NSAxC个IQ采样点为单位，划分为多个窄带采样点组。
第二划分模块1305，用于将N'A个窄带天线载波对应的窄带采样组中，以预设数目个窄带采样组为单位，划分成多个映射采样点组。
同步序列获取模块1306，用于获取每一所述映射采样点组对应的同步序列，将一映射采样点组与其自身对应的同步序列作为一基带采样点组，所述同步序列包括与其对应的所述映射采样点组中各个窄带IQ采样点在窄 带天线载波中的位置信息。
窄带映射模块1307，用于将所述N'A个窄带天线载波的映射采样点组对应的基带采样点组，映射到宽带的K'个宽带的时间片中，其中，所述K'个宽带的时间片所能容纳的基带采样点组的数量大于或等于所述N'A个窄带天线载波的窄带IQ采样点对应的基带采样点组的数量。
宽带映射模块1308，用于以映射后的K'个宽带的时间片为单位，将窄带IQ采样点映射到通用公共无线接口的基本帧中，以完成对窄带IQ采样点在通用公共无线接口中的映射。
可选的，窄带映射模块1307包括：
计算间隔单元，用于依据所述宽带的带宽Ntti、所述宽带的时间片的个数K'以及每个所述窄带天线载波对应的窄带IQ采样点的个数S'，计算出K'个宽带的时间片中映射的相邻两个基带采样点组的间隔Ng-gap；映射单元，用于将N'A个窄带天线载波对应的基带采样点组按照间隔Ng-gap，映射在K'个宽带的时间片中。
可选的，上述数据映射装置还包括：计算最大容纳量模块，用于依据所述间隔Ng-gap，所述同步序列的位宽NSAxC，以及每一所述窄带采样点组包含的窄带IQ采样点的个数NSAxC，计算出K'个宽带的时间片中每一所述间隔Ng-gap的长度所能容纳的最大窄带采样点组数目NC-AxC；确定预设数目模块，用于将一小于等于所述最大窄带采样点组数目NC-AxC的窄带天线载波数目，确定为所述预设数目。
可选的，计算最大容纳量模块，具体用于：
Figure PCTCN2016101132-appb-000028
其中，
Figure PCTCN2016101132-appb-000029
为向下取整符号。
可选的，所述计算间隔单元，具体用于：
Figure PCTCN2016101132-appb-000030
其中，GCD表示计算两者的最大公约数。
可选的，述同步序列包括时隙计数部分和样点计数部分，所述同步序 列获取模块包括：
位宽确定单元，用于确定所述同步序列的位宽为：
Figure PCTCN2016101132-appb-000031
其中，CEIL为向上取整函数；Mi为第i个计数周期的比特数，i为大于等于0小于等于N-1的正整数，N为需要传输的窄带天线载波的计数周期的总个数；2M为一个窄带IQ采样点的比特数。
同步信息填充单元，用于依据与所述同步序列对应的所述映射采样点组中各个窄带IQ采样点在窄带天线载波中的位置信息，填写所述同步序列的所述时隙计数部分和所述样点计数部分。
可选的，第二参数计算模块1303具体用于：
Figure PCTCN2016101132-appb-000032
其中，GCD表示计算两者的最大公约数。
基于以上实施例提供的一种数据映射方法和装置，本发明实施例还提供了一种数据映射设备，下面结合附图来详细说明其工作原理。
参阅图14，该图为本实施例提供的一种数据映射设备的结构框图。
在本实施例中，所述数据映射设备包括：处理器1401以及存储器1402，处理器1401与存储器1402之间通过通信总线1403进行通信，其中：
存储器1402，用于存储所述处理器可执行指令。
其中，所述处理器被配置为：
获取窄带的窄带IQ数据的采样速率f's、宽带的频率fsf以及窄带天线载波数量N'A，所述宽带的频率为时间片的倒数，所述时间片是指宽带制式协议中规定的时间周期；
利用所述窄带的窄带IQ数据的采样速率f's和所述宽带的频率fsf得到每个所述窄带天线载波对应的窄带IQ采样点的个数S'，以及N'A个所述窄带天线载波的窄带IQ采样点能够映射到的宽带的时间片的个数K'；
依据所述窄带IQ采样点的个数S'、所述宽带的时间片的个数K'和所述 宽带的带宽Ntti，计算出窄带采样点组包含的窄带IQ采样点的个数NSAxC；
将所述N'A个窄带天线载波的窄带IQ采样点，以NSAxC个IQ采样点为单位，划分为多个窄带采样点组；
将N'A个窄带天线载波对应的窄带采样组中，以预设数目个窄带采样点组为单位，划分成多个映射采样点组；
获取每一所述映射采样点组对应的同步序列，将一映射采样点组与其自身对应的同步序列作为一基带采样点组，所述同步序列包括与其对应的所述映射采样点组中各个窄带IQ采样点在窄带天线载波中的位置信息；
将所述N'A个窄带天线载波的映射采样点组对应的基带采样点组，映射到K'个宽带的时间片中，其中，所述K'个宽带的时间片所能容纳的基带采样点组的数量大于或等于所述N'A个窄带天线载波的窄带IQ采样点对应的基带采样点组的数量；
以映射后的K'个宽带的时间片为单位，将窄带IQ采样点映射到通用公共无线接口的基本帧中，以完成对窄带IQ采样点在通用公共无线接口中的映射。
可选的，处理器在将所述N'A个窄带天线载波的映射采样点组对应的基带采样点组，映射到宽带的K'个宽带的时间片中时，具体用于：
依据所述宽带的带宽Ntti、所述宽带的时间片的个数K'以及每个所述窄带天线载波对应的窄带IQ采样点的个数S'，计算出K'个宽带的时间片中映射的相邻两个基带采样点组的间隔Ng-gap；将N'A个窄带天线载波对应的基带采样点组按照间隔Ng-gap，映射在K'个宽带的时间片中。
可选的，处理器还用于：
依据所述间隔Ng-gap，所述同步序列的位宽NSAxC，以及每一所述窄带采样点组包含的窄带IQ采样点的个数NSAxC，计算出K'个宽带的时间片中每一所述间隔Ng-gap的长度所能容纳的最大窄带采样点组数目NC-AxC；将一小于等于所述最大窄带采样点组数目NC-AxC的窄带天线载波数目，确定为所述预设数目。
可选的，处理器在依据所述间隔Ng-gap，所述同步序列的位宽NSAxC，以及每一所述窄带采样点组包含的窄带IQ采样点的个数NSAxC，计算出K'个 宽带的时间片中每一所述间隔Ng-gap的长度所能容纳的最大窄带采样点组数目NC-AxC时，具体用于：
Figure PCTCN2016101132-appb-000033
其中，
Figure PCTCN2016101132-appb-000034
为向下取整符号。
可选的，处理器在依据所述宽带的带宽Ntti、所述宽带的时间片的个数K'以及每个所述窄带天线载波对应的窄带IQ采样点的个数S'，计算出K'个宽带的时间片中映射的相邻两个基带采样点组的间隔Ng-gap时，具体用于：
Figure PCTCN2016101132-appb-000035
其中，GCD表示计算两者的最大公约数。
可选的，同步序列包括时隙计数部分和样点计数部分，处理器在获取每一所述映射采样点组对应的同步序列时，具体用于：
确定所述同步序列的位宽为：
Figure PCTCN2016101132-appb-000036
其中，CEIL为向上取整函数；Mi为第i个计数周期的比特数，i为大于等于0小于等于N-1的正整数，N为需要传输的窄带天线载波的计数周期的总个数；2M为一个窄带IQ采样点的比特数；
依据与所述同步序列对应的所述映射采样点组中各个窄带IQ采样点在窄带天线载波中的位置信息，填写所述同步序列的所述时隙计数部分和所述样点计数部分。
可选的，处理器在依据所述窄带IQ采样点的个数S'、所述宽带的时间片的个数K'和所述宽带的带宽Ntti，计算出窄带采样点组包含的窄带IQ采样点的个数NSAxC时，具体用于：
Figure PCTCN2016101132-appb-000037
其中，GCD表示计算两者的最大公约数。
上述处理器可以是微处理器或者该处理器也可以是任何常规的处理器。结合本发明实施例所公开的方法的步骤，可以直接体现为硬件处理器 执行完成，或者用处理器中的硬件及软件模块组合执行完成。当使用软件实现时，可以将实现上述功能的代码存储在计算机可读介质中。计算机可读介质包括计算机存储介质。存储介质可以是计算机能够存取的任何可用介质。以此为例但不限于：计算机可读介质可以是随机存取存储器(英文全称为random access memory，英文缩写为RAM)、只读存储器(英文全称为read-only memory，英文缩写为ROM)、电可擦可编程只读存储器(英文全称为electrically erasable programmable read-only memory，英文缩写为EEPROM)、只读光盘(英文全称为compact disc read-only memory，英文缩写为CD-ROM)或其他光盘存储、磁盘存储介质或者其他磁存储设备、或者能够用于携带或存储具有指令或数据结构形式的程序代码并能够由计算机存取的任何其他介质。计算机可读介质可以是压缩光碟(英文全称为compact disc，英文缩写为CD)、激光碟、数字视频光碟(英文全称为digital video disc，英文缩写为DVD)、软盘或者蓝光碟。
需要说明的是，本说明书中的各个实施例均采用递进的方式描述，每个实施例重点说明的都是与其他实施例的不同之处，各个实施例之间相同相似的部分互相参见即可。
对所公开的实施例的上述说明，使本领域专业技术人员能够实现或使用本发明。对这些实施例的多种修改对本领域的专业技术人员来说将是显而易见的，本文中所定义的一般原理可以在不脱离本发明的精神或范围的情况下，在其它实施例中实现。因此，本发明将不会被限制于本文所示的这些实施例，而是要符合与本文所公开的原理和新颖特点相一致的最宽的范围。

Claims (10)

  1. 一种数据映射方法，其特征在于，包括：
    获取窄带的窄带IQ数据的采样速率f's、宽带的频率fsf以及窄带天线载波数量N'A，所述宽带的频率为时间片的倒数，所述时间片是指宽带制式协议中规定的时间周期；
    利用所述窄带的窄带IQ数据的采样速率f's和所述宽带的频率fsf得到每个所述窄带天线载波对应的窄带IQ采样点的个数S'，以及N'A个所述窄带天线载波的窄带IQ采样点能够映射到的宽带的时间片的个数K'；
    依据所述窄带IQ采样点的个数S'、所述宽带的时间片的个数K'和所述宽带的带宽Ntti，计算出窄带采样点组包含的窄带IQ采样点的个数NSAxC；
    将所述N'A个窄带天线载波的窄带IQ采样点，以NSAxC个IQ采样点为单位，划分为多个窄带采样点组；
    将N'A个窄带天线载波对应的窄带采样组中，以预设数目个窄带采样点组为单位，划分成多个映射采样点组；
    获取每一所述映射采样点组对应的同步序列，将一映射采样点组与其自身对应的同步序列作为一基带采样点组，所述同步序列包括与其对应的所述映射采样点组中各个窄带IQ采样点在窄带天线载波中的位置信息；
    将所述N'A个窄带天线载波的映射采样点组对应的基带采样点组，映射到K'个宽带的时间片中，其中，所述K'个宽带的时间片所能容纳的基带采样点组的数量大于或等于所述N'A个窄带天线载波的窄带IQ采样点对应的基带采样点组的数量；
    以映射后的K'个宽带的时间片为单位，将窄带IQ采样点映射到通用公共无线接口的基本帧中，以完成对窄带IQ采样点在通用公共无线接口中的映射。
  2. 根据权利要求1所述数据映射方法，其特征在于，所述将所述N'A个窄带天线载波的映射采样点组对应的基带采样点组，映射到宽带的K'个宽带的时间片中包括：
    依据所述宽带的带宽Ntti、所述宽带的时间片的个数K'以及每个所述窄带天线载波对应的窄带IQ采样点的个数S'，计算出K'个宽带的时间片中映 射的相邻两个基带采样点组的间隔Ng-gap；
    将N'A个窄带天线载波对应的基带采样点组按照间隔Ng-gap，映射在K'个宽带的时间片中。
  3. 根据权利要求2所述数据映射方法，其特征在于，所述预设数目的确定方法包括：
    依据所述间隔Ng-gap，所述同步序列的位宽NSAxC，以及每一所述窄带采样点组包含的窄带IQ采样点的个数NSAxC，计算出K'个宽带的时间片中每一所述间隔Ng-gap的长度所能容纳的最大窄带采样点组数目NC-AxC；
    将一小于等于所述最大窄带采样点组数目NC-AxC的窄带天线载波数目，确定为所述预设数目。
  4. 根据权利要求3所述数据映射方法，其特征在于，所述依据所述间隔Ng-gap，所述同步序列的位宽NSAxC，以及每一所述窄带采样点组包含的窄带IQ采样点的个数NSAxC，计算出K'个宽带的时间片中每一所述间隔Ng-gap的长度所能容纳的最大窄带采样点组数目NC-AxC包括：
    Figure PCTCN2016101132-appb-100001
    其中，
    Figure PCTCN2016101132-appb-100002
    为向下取整符号。
  5. 根据权利要求2所述数据映射方法，其特征在于，所述依据所述宽带的带宽Ntti、所述宽带的时间片的个数K'以及每个所述窄带天线载波对应的窄带IQ采样点的个数S'，计算出K'个宽带的时间片中映射的相邻两个基带采样点组的间隔Ng-gap包括：
    Figure PCTCN2016101132-appb-100003
    其中，GCD表示计算两者的最大公约数。
  6. 根据权利要求1所述数据映射方法，其特征在于，所述同步序列包括时隙计数部分和样点计数部分，所述获取每一所述映射采样点组对应的同步序列包括：
    确定所述同步序列的位宽为：
    Figure PCTCN2016101132-appb-100004
    其中，CEIL为向上取整函数；Mi为第i个计数周期的比特数，i为大于等于0小于等于N-1的正整数，N为需要传输的窄带天线载波的计数周期的总个数；2M为一个窄带IQ采样点的比特数；
    依据与所述同步序列对应的所述映射采样点组中各个窄带IQ采样点在窄带天线载波中的位置信息，填写所述同步序列的所述时隙计数部分和所述样点计数部分。
  7. 根据权利要求1所述数据映射方法，其特征在于，所述依据所述窄带IQ采样点的个数S'、所述宽带的时间片的个数K'和所述宽带的带宽Ntti，计算出窄带采样点组包含的窄带IQ采样点的个数NSAxC包括：
    Figure PCTCN2016101132-appb-100005
    其中，GCD表示计算两者的最大公约数。
  8. 一种数据映射装置，其特征在于，包括：
    参数获取模块，用于获取窄带的窄带IQ数据的采样速率f's、宽带的频率fsf以及窄带天线载波数量N'A，所述宽带的频率为时间片的倒数，所述时间片是指宽带制式协议中规定的时间周期；
    第一参数计算模块，用于利用所述窄带的窄带IQ数据的采样速率f's和所述宽带的频率fsf得到每个所述窄带天线载波对应的窄带IQ采样点的个数S'，以及N'A个所述窄带天线载波的窄带IQ采样点能够映射到的宽带的时间片的个数K'；
    第二参数计算模块，用于依据所述窄带IQ采样点的个数S'、所述宽带的时间片的个数K'和所述宽带的带宽Ntti，计算出窄带采样点组包含的窄带IQ采样点的个数NSAxC；
    第一划分模块，用于将所述N'A个窄带天线载波的窄带IQ采样点，以NSAxC个IQ采样点为单位，划分为多个窄带采样点组；
    第二划分模块，用于将N'A个窄带天线载波对应的窄带采样组中，以预设数目个窄带采样组为单位，划分成多个映射采样点组；
    同步序列获取模块，用于获取每一所述映射采样点组对应的同步序列，将一映射采样点组与其自身对应的同步序列作为一基带采样点组，所述同步序列包括与其对应的所述映射采样点组中各个窄带IQ采样点在窄带天线载波中的位置信息；
    窄带映射模块，用于将所述N'A个窄带天线载波的映射采样点组对应的基带采样点组，映射到宽带的K'个宽带的时间片中，其中，所述K'个宽带的时间片所能容纳的基带采样点组的数量大于或等于所述N'A个窄带天线载波的窄带IQ采样点对应的基带采样点组的数量；
    宽带映射模块，用于以映射后的K'个宽带的时间片为单位，将窄带IQ采样点映射到通用公共无线接口的基本帧中，以完成对窄带IQ采样点在通用公共无线接口中的映射。
  9. 根据权利要求8所述数据映射装置，其特征在于，所述同步序列包括时隙计数部分和样点计数部分，所述同步序列获取模块包括：
    位宽确定单元，用于确定所述同步序列的位宽为：
    Figure PCTCN2016101132-appb-100006
    其中，CEIL为向上取整函数；Mi为第i个计数周期的比特数，i为大于等于0小于等于N-1的正整数，N为需要传输的窄带天线载波的计数周期的总个数；2M为一个窄带IQ采样点的比特数；
    同步信息填充单元，用于依据与所述同步序列对应的所述映射采样点组中各个窄带IQ采样点在窄带天线载波中的位置信息，填写所述同步序列的所述时隙计数部分和所述样点计数部分。
  10. 一种数据映射设备，其特征在于，包括：
    处理器；
    用于存储所述处理器可执行指令的存储器；
    其中，所述处理器被配置为：
    获取窄带的窄带IQ数据的采样速率f's、宽带的频率fsf以及窄带天线载波数量N'A，所述宽带的频率为时间片的倒数，所述时间片是指宽带制式协议中规定的时间周期；
    利用所述窄带的窄带IQ数据的采样速率f's和所述宽带的频率fsf得到每个所述窄带天线载波对应的窄带IQ采样点的个数S'，以及N'A个所述窄带天线载波的窄带IQ采样点能够映射到的宽带的时间片的个数K'；
    依据所述窄带IQ采样点的个数S'、所述宽带的时间片的个数K'和所述宽带的带宽Ntti，计算出窄带采样点组包含的窄带IQ采样点的个数NSAxC；
    将所述N'A个窄带天线载波的窄带IQ采样点，以NSAxC个IQ采样点为单位，划分为多个窄带采样点组；
    将N'A个窄带天线载波对应的窄带采样组中，以预设数目个窄带采样点组为单位，划分成多个映射采样点组；
    获取每一所述映射采样点组对应的同步序列，将一映射采样点组与其自身对应的同步序列作为一基带采样点组，所述同步序列包括与其对应的所述映射采样点组中各个窄带IQ采样点在窄带天线载波中的位置信息；
    将所述N'A个窄带天线载波的映射采样点组对应的基带采样点组，映射到K'个宽带的时间片中，其中，所述K'个宽带的时间片所能容纳的基带采样点组的数量大于或等于所述N'A个窄带天线载波的窄带IQ采样点对应的基带采样点组的数量；
    以映射后的K'个宽带的时间片为单位，将窄带IQ采样点映射到通用公共无线接口的基本帧中，以完成对窄带IQ采样点在通用公共无线接口中的映射。
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