WO2018058549A1 - Data mapping method, apparatus, and device - Google Patents

Abstract

Embodiments of the present application provide a data mapping method, apparatus, and device. In the method, narrowband IQ sampling points corresponding to N'_A narrowband antenna carriers of a narrowband channel are bundled and grouped, to obtain a narrowband sampling point group. A preset number of narrowband sampling point groups are used as a mapping narrowband sampling point group, and the mapping narrowband sampling point group and a synchronization sequence corresponding thereto are used as a baseband sampling point group. The baseband sampling point groups corresponding to the N'_A narrowband antenna carriers are mapped onto K' wideband time slices of a wideband channel, and the narrowband IQ sampling points of the narrowband channel are mapped onto a basic frame of a common public radio interface (CPRI) in units of K' mapped wideband time slices. By using the technical solutions in the embodiments of the present application, a CPRI can transmit both wideband and narrowband data, thereby achieving compatible transmission of wideband and narrowband data, and improving the adaptability and utilization of existing CPRIs.

Description

Data mapping method, device and device Technical field

The present invention relates to the field of communications, and in particular, to a data mapping method, apparatus, and device.

Background technique

With the continuous advancement of mobile communication technology, the network architecture of wireless communication is also evolving. The base station system with baseband and radio frequency separation as the main features has become a public network base station, especially the Long Term Evolution (LTE) base station. In the main form, the base station system is a distributed radio frequency system. In a distributed radio frequency system in which a baseband unit (BBU) and a remote radio unit (RRU) are distributed, a common public radio interface (CPRI) 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. Because CPRI has the characteristics of standardization, high transmission rate and small delay, it becomes a common interface for REC and RE in public network base stations. The transmission protocol of the interface is called CPRI protocol. Figure 1 shows the basic configuration of CPRI. In addition to REC and RE, 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. Generally, 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. If the REC transmits IQ data to the RE, the REC is referred to as a data transmitter, and the RE is referred to as a data receiver; if the RE transmits IQ data to the REC, the RE is referred to as a data transmitter and the REC is referred to as a data receiver. Regardless of which party is the data transmitter and which party is the 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.

个采样点的条件。若N_A·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：Three 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. The calculation of S and K is given in the agreement, namely:

Where f _s is the sampling rate of the wideband IQ data, f _c is the CPRI basic frame rate, fixed at 3.84 MHz, and LCM is a function for calculating the least common multiple.

At present, cluster private networks are relatively slow in technology development. Traditional narrowband systems, such as digital trunking PDT, digital mobile radio standard DMR, Tetra (Trans European Trunked Radio), etc., are still using an integrated base station architecture, ie The architecture of the BBU and the RRU is integrated. With the evolution of the system broadband LTE, it is necessary to adopt a separate architecture of the BBU and the RRU. This involves the problem of the containment and transmission of narrowband data in CPRI, and the CPRI interface protocol of the public network cannot be directly used in the cluster private network because it calculates the S wideband IQ sampling points (or narrowband IQ sampling points). When the number of basic frames is K, the value obtained by narrowband calculation is much higher than that obtained by wideband calculation. In the public network mode, the configuration of the mapping parameter K is usually small (for example, within 50), so that the existing CPRI cannot transmit narrowband narrowband IQ data.

Therefore, there is a need for a data mapping method that is compatible with transmitting narrowband IQ data and wideband IQ data.

Summary of the invention

In order to solve the technical problems existing in the prior art, 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:

Get the narrowband sampling rate of narrowband IQ data f _'s, the frequency f _sf broadband and narrowband antenna-carrier number N' _A, the wideband of frequencies is the reciprocal of the time slice, the time slice refers to a predetermined broadband standard protocol Time period;

Using the narrowband sampling rate of narrowband IQ data f _'s and the wideband frequency f _sf each of the narrowband antenna to obtain narrowband IQ sample carrier corresponding number of points S', and N _'A of said narrowband The number K' of time slices of the broadband that the narrowband IQ sampling point of the antenna carrier can be mapped to;

Calculating the number of narrow-band IQ sampling points included in the narrow-band sampling point group N _SAxC 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 ;

And dividing the narrow-band IQ sampling points of the N′ _A narrow-band antenna carriers into a plurality of narrow-band sampling point groups in units of N _SA ×C IQ sampling points;

And dividing the narrowband sampling group corresponding to the N′ _A narrowband antenna carriers into a plurality of mapping sampling point groups by using a preset number of narrowband sampling point groups;

Acquiring a synchronization sequence corresponding to each of the mapping sample point groups, and using a synchronization sequence corresponding to a mapping sample point group as a baseband sampling point group, where the synchronization sequence includes each narrow band in the mapping sampling point group corresponding thereto Position information of the IQ sample point in the narrowband antenna carrier;

The N _'A narrowband antenna-carrier mapping set of samples corresponding baseband set of samples, mapped to K' broadband time slice, wherein, the K 'time slices wideband baseband sampling can be accommodated the number of points is greater than or equal to the set of N 'number of sampling points of the group _a narrow-band antenna-carrier narrowband IQ samples corresponding to baseband;

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.

Wherein the N _'A narrowband antenna-carrier mapping set of samples corresponding baseband set of samples mapped to broadband K' wideband time slice comprising:

Calculating K' broadband time slices according to the bandwidth _Ntti of the broadband, the number K' of the wideband time slices, and the number S' of narrowband IQ sampling points corresponding to each of the narrowband antenna carriers The interval between adjacent two baseband sampling point groups of the mapping N _g-gap ;

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:

Calculating K' wide-band time slices 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 that can be accommodated by the length of each of the intervals N _g-gap N _C-AxC ;

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.

Wherein, 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, 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:

为向下取整符号。among them,

Round the symbol down.

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:

Among them, 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:

Wherein, 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;

Filling in the slot count portion of the synchronization sequence and the sample count portion according to position information of each narrowband IQ sample point in the narrowband antenna carrier in the mapped sample point group corresponding to the synchronization sequence.

The calculating, 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, calculating a narrow-band IQ sampling point included in the narrow-band sampling point group. The number N _SAxC includes:

Among them, 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 first dividing means for 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;

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, and the synchronization sequence acquisition module includes:

a bit width determining unit, configured to determine a bit width of the synchronization sequence as:

Wherein, 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:

processor;

a memory for storing the processor executable instructions;

Wherein the processor is configured to:

Get the narrowband sampling rate of narrowband IQ data f _'s, the frequency f _sf broadband and narrowband antenna-carrier number N' _A, the wideband of frequencies is the reciprocal of the time slice, the time slice refers to a predetermined broadband standard protocol Time period;

Using the narrowband sampling rate of narrowband IQ data f _'s and the wideband frequency f _sf each of the narrowband antenna to obtain narrowband IQ sample carrier corresponding number of points S', and N _'A of said narrowband The number K' of time slices of the broadband that the narrowband IQ sampling point of the antenna carrier can be mapped to;

Calculating the number of narrow-band IQ sampling points included in the narrow-band sampling point group N _SAxC 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 ;

And dividing the narrow-band IQ sampling points of the N′ _A narrow-band antenna carriers into a plurality of narrow-band sampling point groups in units of N _SA ×C IQ sampling points;

And dividing the narrowband sampling group corresponding to the N′ _A narrowband antenna carriers into a plurality of mapping sampling point groups by using a preset number of narrowband sampling point groups;

Obtaining a synchronization sequence corresponding to each of the mapped sampling point groups, and mapping a mapping sampling point group thereto 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 N _'A narrowband antenna-carrier mapping set of samples corresponding baseband set of samples, mapped to K' broadband time slice, wherein, the K 'time slices wideband baseband sampling can be accommodated the number of points is greater than or equal to the set of N 'number of sampling points of the group _a narrow-band antenna-carrier narrowband IQ samples corresponding to baseband;

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.

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. With the technical solution in the embodiment of the present application, the CPRI can simultaneously transmit the broadband IQ data and the narrowband IQ data, thereby achieving compatible transmission of the wide and narrowband data, and improving the adaptability and utilization of the existing CPRI.

In order to ensure that N _'A narrowband antenna-carrier narrowband IQ samples can be uniformly mapped to K' time slice broadband, 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. In order to enable the data receiver to normally parse the basic frame of the broadband carrying the narrowband IQ data transmitted by the data transmission side, 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. .

DRAWINGS

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the description of the prior art will be briefly described below. Obviously, the drawings in the following description are only It is a certain embodiment of the present invention, and other drawings can be obtained from those skilled in the art without any creative work.

Figure 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;

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;

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;

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.

detailed description

The technical solutions in the embodiments of the present invention are clearly and completely described in the following with reference to the accompanying drawings in the embodiments of the present invention. It is obvious that the described embodiments are only a part of the embodiments of the present invention, but not all embodiments. Based on the embodiments of the present invention, those of ordinary skill in the art are not All other embodiments obtained under the premise of creative work are within the scope of the present invention.

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.

For example, suppose the sampling rate of broadband wide-band IQ data is f _s = 30.72 MHz. Since f _c is a fixed value of 3.84 MHz, there is LCM(f _s , f _c )=30.72 MHz, and then:

Assume that the narrow-band narrow-band IQ data has a sampling rate of f _s = 38.4 KHz = 3.84 × 10 ^-2 MHz. Since f _c is a fixed value of 3.84 MHz, LCM(f _s , f _c ) = 3.84 MHz, and thus:

It can be seen that the K value of the transmitted narrowband IQ data and the K value of the transmission wideband IQ data are greatly different, and the existing CPRI is not suitable for the transmission of the narrowband IQ data.

In order to overcome this technical problem, 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.

The technical solutions in the embodiments of the present invention are clearly and completely described in the following with reference to the accompanying drawings in the embodiments of the present invention. It is a partial embodiment of the invention, and not all of the embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative efforts are within the scope of the present invention.

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.

In this embodiment, the number S′ of the narrowband IQ sampling points corresponding to each of the narrowband antenna carriers can be obtained by the following formula:

Wherein, 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:

Wherein, the LCM is a function for calculating a least common multiple.

It should be noted that the above two formulas do not constitute a limitation of the present invention, and those skilled in the art can design according to the technical idea provided by the present invention in combination with actual application requirements.

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 .

In this embodiment, N _SAxC can be obtained by the following formula:

Among them, GCD represents the calculation of the greatest common divisor of the two.

It should be noted that the above formula does not constitute a limitation of the present invention, and those skilled in the art can design according to the technical idea provided by the present invention in combination with actual application requirements.

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.

Number of narrow-band sample point groups in which N' _A narrowband antenna carriers are divided

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:

Calculating K' wide-band time slices 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} can be accommodated by the length of each of the intervals N _g-gap . 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.

In this embodiment, N _SAxC and N _g-gap can be obtained by the following formula:

为向下取整符号。among them,

Round the symbol down.

Among them, GCD represents the calculation of the greatest common divisor of the two, N _tti is the bandwidth of the broadband.

It should be noted that the above formula does not constitute a limitation of the present invention, and those skilled in the art can design according to the technical idea provided by the present invention in combination with actual application requirements.

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.

Specifically, determining a bit width of the synchronization sequence is:

Wherein, 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 sample point.

Filling in the slot count portion of the synchronization sequence and the sample count portion according to position information of each narrowband IQ sample point in the narrowband antenna carrier in the mapped sample point group corresponding to the synchronization sequence.

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.

In practice, if 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.

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. With the technical solution in the embodiment of the present application, the CPRI can simultaneously transmit the broadband IQ data and the narrowband IQ data, thereby achieving compatible transmission of the wide and narrowband data, and improving the adaptability and utilization of the existing CPRI.

In order to ensure that N _'A narrowband antenna-carrier narrowband IQ samples can be uniformly mapped to K' time slice broadband, 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. In order to enable the data receiver to normally parse the basic frame of the broadband carrying the narrowband IQ data transmitted by the data transmission side, 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. .

In the data mapping method provided by the embodiment of the present application, 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:

Calculating K' broadband time slices according to the bandwidth _Ntti of the broadband, the number K' of the wideband time slices, and the number S' of narrowband IQ sampling points corresponding to each of the narrowband antenna carriers The interval N _{g-gap of the} mapped adjacent two baseband sample point groups SAxC Group.

The N _'A narrowband antenna-carrier corresponding baseband set of samples at intervals of N _g-gap, mapping K' sub-time slice.

As shown in FIG. 5 , 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. .

5 is a manner in which 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.

The 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. Optionally, 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. 5, is to select a set of samples from each of the narrow-band narrowband antenna carriers, the mapping narrowband each set of samples comprising N _'A narrowband set of samples, the first narrow band antennas r carriers corresponding to the narrowband The sample point group is called SAxCr, and the narrow band sample point groups included in the SAxC Group are: SAxC0, SAxC1, SAxC2, ..., SAxC(N' _A -1).

In the embodiment of the present application, 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.

This embodiment introduces the data mapping method provided by the present invention by combining actual application scenarios. In this embodiment, the narrowband is a PDT (Police Digital Trunking or Public Digital Trunking) system, and 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.

In order to better understand the data mapping method provided by this embodiment, first introduce the frame format and narrowband IQ data format of the PDT cluster system. Referring to FIG. 6, the figure shows a frame structure of the PDT system. In 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.

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. After modulation, the narrowband IQ data is upsampled by a certain multiple over the symbol rate. In this embodiment, the sampling rate is 8 times, that is, the narrow-band IQ sampling rate of f _'s = 8 × 4800 Hz = 38400 Hz. Of course, other sampling rates can be used in practice. Furthermore, it is assumed that the number of antenna carriers of the PDT is N' _A = 4.

In this embodiment, 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). To load the narrow-band IQ sampling points of the four antenna carriers of the PDT into the K' subframes of LTE for transmission, the following conditions should be met:

Wherein, each antenna carrier of the PDT corresponds to S' narrowband IQ sampling points.

Since S' and K' can only take integers, it is necessary to process the fractional f _'s , that is, when calculating the least common multiple of f _'s and _fsf , multiply f _'s by 10, and correspondingly, Multiply f _sf by 10.

S' and K' can be obtained by the following formula:

Among them, 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:

That is, 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:

In the embodiment of the present application, it is assumed that 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.

The bit width of the synchronization sequence of the mapped sample point group is calculated as follows:

According to the narrowband IQ data of the PDT system, since the narrowband IQ data includes two slots (the total number of counting periods of the narrowband antenna carrier is 2); 144 symbols per slot, in this embodiment, the sampling rate is 8 times. For example, if the narrow-band IQ sampling rate of f' _s = 38.4ksps, the number of sampling points per slot is 144*8=1152 (0 to 1151 can be represented by 11 bits, so the number of bits in the i-th counting period Is 11). Assume that the CPRI line rate is 4915.2 Mbps and the IQ sampling bit width is M=15 bits.

The bit width of the synchronization sequence is:

Wherein, 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 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.

In order to map the IQ sampling points of the 4 antenna carriers of the PDT into the 5 subframes of the LTE, it is necessary to ensure that the IQ sampling points of the PDTs that can be accommodated in the five subframes are greater than or equal to the IQ sampling in the four antenna carriers. point. Since the antenna carrier of each PDT corresponds to 192 IQ sampling points, the four antenna carriers correspond to 192×4=768 IQ sampling points, so it is necessary to ensure that 5 subframes can accommodate a minimum of 768 IQ sampling points.

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.

Table 1

Bandwidth (MHz) 1.4 3 5 10 15 20 N _symbol 128 256 512 1024 1536 or 2048 2048

The number of sample points N _{tti that} an LTE sub-frame can accommodate is obtained according to the following formula:

N _tti =15·N _symbol =15×2048=30720

Therefore, the number of sample points N _{g that} can be accommodated in K' sub-frames in this embodiment is obtained according to the following formula:

N _g =K'·N _tti =5×30720=153600

After calculation, 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:

Among them, GCD represents the calculation of the greatest common divisor of the two.

In the embodiment of the present application, 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.

Since the interval between the two baseband sample point groups is _Ng-gap , the baseband sample point group data that can be accommodated by K' wideband time slices can be calculated by the following formula:

N _g /N _g-gap =153600/800=192

The N 'narrow band antenna-carrier mapping _A narrowband to broadband IQ samples K' wideband time slice, shown in Figure 10 (details see FIG. 5), FIG. 9, 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.

In addition, it is also possible to verify whether the 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:

The maximum number of narrow-band sample point groups that can be accommodated in K' LTE subframes is N _C :

N _C =(N _g /N _g-gap )*N _C-AxC =192*770=147840

That is to say, the number of the most narrow-band sampling point groups of the PDTs that can be multiplexed in the five LTE subframes in this embodiment is 147,840, which far exceeds the number of narrow-band sampling point groups corresponding to the narrow-band antenna carriers of the actual PDT ( 192*4=768), so the IQ sample points of the 4 antenna carriers of the PDT can be "loaded" into the 5 LTE subframes.

In this embodiment, after the IQ sampling points of the PDT 4 antenna carriers are mapped into the 5 LTE subframes, the remaining sampling point capacity in the 5 LTE subframes may be filled with invalid IQ sampling points, and also That is to say, N _g -4 × _S' -192 × N _SAxC = 153600 - 4 × 192 - 192 × 30 = 147072 invalid IQ sampling points can be filled, and the invalid IQ sampling points refer to IQ sampling points for filling, The contents can be ignored on both the sender and receiver.

After introducing how to map the PDT IQ sampling points into LTE sub-frames, the following describes How to carry out data-compatible transmission of wide and narrow bands.

It is assumed that the number of antenna carriers N _A of the LTE supported by the CPRI is calculated to be 4, and the LTE IQ sampling point actually needed to be transmitted only needs to occupy two antenna carriers, and then one of the remaining two antenna carriers can be used for multiplexing. The IQ sample point of the PDT, and the other one is reserved for idle. Referring to FIG. 11, AxC0 (ie, LTE AxC#0) and AxC1 (ie, LTE AxC#1) are used to "load" the IQ sampling point of LTE, and AxC2 (ie, LTE AxC#2) is used to "load" the IQ sampling point of the PDT. This multiplexing method enables compatible transmission of wide and narrowband data.

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. As shown in FIG. 12, 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. In the embodiment of the present application, 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.

In the embodiment of the present application, 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. It can be seen from Fig. 12 that 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. 12) Multiplexed into LTE AxC#0, 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.

In an actual application, if the REC is a data transmission party and the RE is a data data receiver, 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.

Based on a data mapping method provided by the above embodiments, 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 provided in this embodiment 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 .

A first division module 1304, for 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.

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.

Optionally, 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.

Optionally, 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.

Optionally, calculate the maximum capacity module, specifically for:

为向下取整符号。among them,

Round the symbol down.

Optionally, the calculating interval unit is specifically configured to:

Among them, GCD represents the calculation of the greatest common divisor of the two.

Optionally, the synchronization sequence includes a slot count portion and a sample count portion, and the synchronization sequence The column acquisition module includes:

a bit width determining unit, configured to determine a bit width of the synchronization sequence as:

Wherein, 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 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.

Optionally, the second parameter calculation module 1303 is specifically configured to:

Among them, GCD represents the calculation of the greatest common divisor of the two.

Based on the data mapping method and apparatus provided by the above embodiments, 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.

Referring to FIG. 14, which is a structural block diagram of a data mapping device according to an embodiment of the present disclosure.

In this embodiment, 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.

Wherein the processor is configured to:

Get the narrowband sampling rate of narrowband IQ data f _'s, the frequency f _sf broadband and narrowband antenna-carrier number N' _A, the wideband of frequencies is the reciprocal of the time slice, the time slice refers to a predetermined broadband standard protocol Time period;

Using the narrowband sampling rate of narrowband IQ data f _'s and the wideband frequency f _sf each of the narrowband antenna to obtain narrowband IQ sample carrier corresponding number of points S', and N _'A of said narrowband The number K' of time slices of the broadband that the narrowband IQ sampling point of the antenna carrier can be mapped to;

Calculating the number of narrow-band IQ sampling points included in the narrow-band sampling point group N _SAxC 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 ;

And dividing the narrow-band IQ sampling points of the N′ _A narrow-band antenna carriers into a plurality of narrow-band sampling point groups in units of N _SA ×C IQ sampling points;

And dividing the narrowband sampling group corresponding to the N′ _A narrowband antenna carriers into a plurality of mapping sampling point groups by using a preset number of narrowband sampling point groups;

Acquiring a synchronization sequence corresponding to each of the mapping sample point groups, and using a synchronization sequence corresponding to a mapping sample point group as a baseband sampling point group, where the synchronization sequence includes each narrow band in the mapping sampling point group corresponding thereto Position information of the IQ sample point in the narrowband antenna carrier;

The N _'A narrowband antenna-carrier mapping set of samples corresponding baseband set of samples, mapped to K' broadband time slice, wherein, the K 'time slices wideband baseband sampling can be accommodated the number of points is greater than or equal to the set of N 'number of sampling points of the group _a narrow-band antenna-carrier narrowband IQ samples corresponding to baseband;

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.

Optionally, when 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:

Calculating K' broadband time slices according to the bandwidth _Ntti of the broadband, the number K' of the wideband time slices, and the number S' of narrowband IQ sampling points corresponding to each of the narrowband antenna carriers two adjacent groups baseband samples mapped interval N _g-gap; the N _'a narrowband antenna-carrier corresponding baseband set of samples at intervals of N _g-gap, mapping K' wideband time slice.

Optionally, the processor is also used to:

Calculating K' wide-band time slices 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 that can be accommodated by the length of each of the intervals N _g-gap N _C-AxC ; the number of narrow-band antenna carriers less than or equal to the number of the maximum narrow-band sampling point groups N _C-AxC is determined as The preset number.

Optionally, 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:

为向下取整符号。among them,

Round the symbol down.

Optionally, 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. When the interval between two adjacent baseband sampling point groups mapped in a wide-band time slice is N _g-gap , it is specifically used to:

Among them, GCD represents the calculation of the greatest common divisor of the two.

Optionally, the synchronization sequence includes a slot count portion and a sample count portion. When 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:

Wherein, 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;

Filling in the slot count portion of the synchronization sequence and the sample count portion according to position information of each narrowband IQ sample point in the narrowband antenna carrier in the mapped sample point group corresponding to the synchronization sequence.

Optionally, 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. When the number of sampling points is N _SAxC , it is specifically used to:

Among them, 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. When implemented in software, 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. For example, but not limited to: 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 A storage, magnetic storage medium or other magnetic storage device, or any other medium that can be used to carry or store program code in the form of an instruction or data structure and that can be accessed by a computer. 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.

It should be noted that each embodiment in the specification is described in a progressive manner, and each embodiment focuses on differences from other embodiments, and the same similar parts between the embodiments are referred to each other. can.

The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments are obvious to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but the scope of the invention is to be accorded

Claims (10)

A data mapping method, comprising: Get the narrowband sampling rate of narrowband IQ data f _'s, the frequency f _sf broadband and narrowband antenna-carrier number N' _A, the wideband of frequencies is the reciprocal of the time slice, the time slice refers to a predetermined broadband standard protocol Time period; Using the narrowband sampling rate of narrowband IQ data f _'s and the wideband frequency f _sf each of the narrowband antenna to obtain narrowband IQ sample carrier corresponding number of points S', and N _'A of said narrowband The number K' of time slices of the broadband that the narrowband IQ sampling point of the antenna carrier can be mapped to; Calculating the number of narrow-band IQ sampling points included in the narrow-band sampling point group N _SAxC 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 ; And dividing the narrow-band IQ sampling points of the N′ _A narrow-band antenna carriers into a plurality of narrow-band sampling point groups in units of N _SA ×C IQ sampling points; And dividing the narrowband sampling group corresponding to the N′ _A narrowband antenna carriers into a plurality of mapping sampling point groups by using a preset number of narrowband sampling point groups; Acquiring a synchronization sequence corresponding to each of the mapping sample point groups, and using a synchronization sequence corresponding to a mapping sample point group as a baseband sampling point group, where the synchronization sequence includes each narrow band in the mapping sampling point group corresponding thereto Position information of the IQ sample point in the narrowband antenna carrier; The N _'A narrowband antenna-carrier mapping set of samples corresponding baseband set of samples, mapped to K' broadband time slice, wherein, the K 'time slices wideband baseband sampling can be accommodated the number of points is greater than or equal to the set of N 'number of sampling points of the group _a narrow-band antenna-carrier narrowband IQ samples corresponding to baseband; 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 data mapping method according to claim 1, wherein the said N _'A narrowband antenna-carrier mapping set of samples corresponding baseband set of samples mapped to broadband K' time slices of broadband include: Calculating K' broadband time slices according to the bandwidth _Ntti of the broadband, the number K' of the wideband time slices, and the number S' of narrowband IQ sampling points corresponding to each of the narrowband antenna carriers The interval between adjacent two baseband sampling point groups of the mapping N _g-gap ; The N _'A narrowband antenna-carrier Baseband samples corresponding set of intervals N _g-gap, mapping K' wideband time slice. The data mapping method according to claim 2, wherein the predetermined number of determining methods comprises: Calculating K' wide-band time slices 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 that can be accommodated by the length of each of the intervals N _g-gap N _C-AxC ; 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 data mapping method according to claim 3, wherein said bit width N _{SAxC of} said synchronization sequence and said narrow-band IQ sampling point included in each said narrow-band sampling point group according to said interval N _g-gap The number of N _SAxC , which calculates the maximum number of narrow-band sampling point groups N _C-AxC that can accommodate the length of each of the intervals N _g-gap in the time slice of K' broadband: N _C-AxC includes:

among them,

Round the symbol down. The data mapping method according to claim 2, wherein said bandwidth _Ntti according to said wideband, said number K' of time slices of said wideband, and narrowband IQ sampling points corresponding to said narrowband antenna carrier the number of S ', the calculated K' N _g-gap spacing between two adjacent sampling points set baseband broadband time map sheet comprising:

Among them, GCD represents the calculation of the greatest common divisor of the two. The data mapping method according to claim 1, wherein the synchronization sequence comprises a slot counting portion and a sample counting portion, and the acquiring the synchronization sequence corresponding to each of the mapping sampling point groups comprises: Determining the bit width of the synchronization sequence is:

Wherein, 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; Filling in the slot count portion of the synchronization sequence and the sample count portion according to position information of each narrowband IQ sample point in the narrowband antenna carrier in the mapped sample point group corresponding to the synchronization sequence. The data mapping method according to claim 1, wherein the calculating is performed 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 The number of narrow-band IQ sampling points included in the narrow-band sampling point group N _SAxC includes:

Among them, 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 first dividing means for 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; 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; a broadband mapping module, configured to map a narrowband IQ sampling point to a basic frame of a general public radio interface in units of the mapped K'th broadband time slices, to complete the narrowband IQ sampling point in the general public wireless interface Mapping. The data mapping apparatus according to claim 8, wherein the synchronization sequence comprises a slot count portion and a sample count portion, and the synchronization sequence acquisition module comprises: a bit width determining unit, configured to determine a bit width of the synchronization sequence as:

Wherein, 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: processor; a memory for storing the processor executable instructions; Wherein the processor is configured to: Get the narrowband sampling rate of narrowband IQ data f _'s, the frequency f _sf broadband and narrowband antenna-carrier number N' _A, the wideband of frequencies is the reciprocal of the time slice, the time slice refers to a predetermined broadband standard protocol Time period; Using the narrowband sampling rate of narrowband IQ data f _'s and the wideband frequency f _sf each of the narrowband antenna to obtain narrowband IQ sample carrier corresponding number of points S', and N _'A of said narrowband The number K' of time slices of the broadband that the narrowband IQ sampling point of the antenna carrier can be mapped to; Calculating the number of narrow-band IQ sampling points included in the narrow-band sampling point group N _SAxC 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 ; And dividing the narrow-band IQ sampling points of the N′ _A narrow-band antenna carriers into a plurality of narrow-band sampling point groups in units of N _SA ×C IQ sampling points; And dividing the narrowband sampling group corresponding to the N′ _A narrowband antenna carriers into a plurality of mapping sampling point groups by using a preset number of narrowband sampling point groups; Acquiring a synchronization sequence corresponding to each of the mapping sample point groups, and using a synchronization sequence corresponding to a mapping sample point group as a baseband sampling point group, where the synchronization sequence includes each narrow band in the mapping sampling point group corresponding thereto Position information of the IQ sample point in the narrowband antenna carrier; The N _'A narrowband antenna-carrier mapping set of samples corresponding baseband set of samples, mapped to K' broadband time slice, wherein, the K 'time slices wideband baseband sampling can be accommodated the number of points is greater than or equal to the set of N 'number of sampling points of the group _a narrow-band antenna-carrier narrowband IQ samples corresponding to baseband; 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.

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