CN106487492B

CN106487492B - Data mapping method, device and equipment

Info

Publication number: CN106487492B
Application number: CN201610876918.1A
Authority: CN
Inventors: 焦富强; 鲁志兵; 王志国; 杨盛波; 杨洁
Original assignee: Hytera Communications Corp Ltd
Current assignee: Hytera Communications Corp Ltd
Priority date: 2016-09-30
Filing date: 2016-09-30
Publication date: 2020-01-21
Anticipated expiration: 2036-09-30
Also published as: CN106487492A

Abstract

The embodiment of the invention discloses a data mapping method, a device and equipment, which realize the data mapping method capable of transmitting narrowband IQ data on the premise of not changing CPRI. Wherein the method comprises: obtaining narrow-band IQ sampling rate f_s', broadband frequency f_sfAnd number of narrowband antenna carriers N'_AThe frequency of the broadband is the reciprocal of a time slice, and the time slice refers to a time period specified in a broadband standard protocol; IQ sampling rate f using narrow band_s' and frequency f of the broadband_sfObtaining the number S ' and N ' of narrow-band IQ sampling points corresponding to each narrow-band antenna carrier '_AThe number K' of the broadband time slices to which the narrow-band IQ sampling points of the antenna carriers can be mapped; n 'of narrow band'_AMapping narrow-band IQ sampling points of the antenna carriers to K' time slices of a broadband; and mapping the narrow-band IQ sampling points to a basic frame of the common wireless interface by taking the mapped K' time slices as a unit so as to complete the mapping of the narrow-band IQ sampling points in the common wireless interface.

Description

Data mapping method, device and equipment

Technical Field

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

Background

This section is intended to provide a background or context to the embodiments of the invention that are recited in the claims. The description herein is not admitted to be prior art by inclusion in this section.

With the continuous progress of mobile communication technology, the network architecture of wireless communication is also continuously evolving forward, and a Base station system with the main characteristics of Base Band Unit (BBU) and Remote Radio Unit (RRU) separation has become the main form of a public network Base station (especially LTE Base station). In the Radio frequency system in which the two are distributed, a Common Public Radio Interface (CPRI) is a standard Interface for interaction between a Radio Equipment Control center (REC) in which the baseband unit is located and a Radio Equipment (RE) in which the remote Radio frequency unit is located. CPRI has the characteristics of standardization, high transmission rate, small delay, and the like, and thus, CPRI becomes a common interface for REC and RE in a public network base station, and a transmission protocol of the interface is called a CPRI protocol. Fig. 1 is a basic configuration diagram of CPRI, and a CPRI system includes a CPRI link in addition to REC and RE. Fig. 2 is a layered structure diagram of the CPRI protocol, which shows that the CPRI protocol is divided into two layers: the physical layer and the data link layer. Generally, a digital baseband modulation signal between the REC and the RE is transmitted through an in-phase/Quadrature-phase (IQ) two-component data stream (IQ data for short) channel in a data link layer. If the REC transmits IQ data to the RE, the REC is called a data transmitter, and the RE is called a data receiver; if the RE transmits IQ data to the REC, the RE is called a data transmitter and the REC is called a data receiver. Regardless of which party is the data transmitting party and which party is the data receiving party, IQ data mapping is required before transmission of IQ data, and the purpose is to transmit IQ data according to the transmission requirements of CPRI.

Three IQ data mapping methods are proposed in the existing CPRI protocol: IQ-sample based (IQ sampled), symbol based (symbol based), and backward compatible (backward compatible). The basic idea of mapping the third IQ data is as follows: n of broadband_AIQ sampling points (IQsamples) of Antenna carriers (Antenna-carrier, AxC for short) are uniformly distributed in K basic frames, each AxC has the same characteristics (the bit width and the sampling rate are the same), and each AxC corresponds to S IQ sampling points respectively. The basic frame is the basic unit of CPRI transmission, N_AThe corresponding time of the S IQ sampling points is the same as the time of the K fundamental frames. One basic frame corresponds to one AxC Container (AxC Container), so the size N of one AxC Container_CNeed to be satisfied at least to be able to bear

The condition of each sample point. If N is present_AThe S IQ samples do not fill the AxC container in the K basic frames, and the remaining volume in the AxC container is filled by invalid samples. The calculation mode of S and K is given in the protocol, namely:

wherein f is_sIs the sampling rate of IQ data, f_cFixed at 3.84MHz for CPRI basic frame rate, LCM is a function of the calculated least common multiple.

At present, a trunking private network is evolving from a narrow band to a wide band, and a traditional narrow band system (PDT, DMR, Tetra, etc.) also uses an integrated base station architecture, that is, an architecture integrating a BBU and an RRU, but in the process of evolution, an architecture separating the BBU and the RRU must be adopted, so that the problem of data transmission of narrow band data in the CPRI is involved. The CPRI interface protocol of the public network cannot be directly used in the private trunking network because the value obtained by narrow-band computation is much higher than the value obtained by wide-band computation when the number K of the basic frames corresponding to S IQ sampling points is computed. In the public network system, the configuration of the mapping parameter K is usually small (for example, within 50), so that the existing CPRI cannot transmit the narrow-band IQ data, and if the existing CPRI is adapted to the transmission of the narrow-band IQ data, the configuration needs to be greatly changed, which is very inconvenient.

Therefore, a data mapping method capable of transmitting narrowband IQ data without changing CPRI is needed.

Disclosure of Invention

In order to solve the technical problems in the prior art, the invention provides a data mapping method, a data mapping device and data mapping equipment, which achieve the purpose of transmitting narrowband IQ data on the premise of not changing CPRI.

The embodiment of the invention provides a data mapping method, which comprises the following steps:

obtaining narrow-band IQ sampling rate f_s', broadband frequency f_sfAnd number of narrowband antenna carriers N'_AThe frequency of the broadband is the reciprocal of a time slice, and the time slice refers to a time period specified in a broadband standard protocol;

IQ sampling rate f using said narrow band_s' and frequency of said wide bandf_sfObtaining the number S ' and N ' of narrow-band IQ sampling points corresponding to each narrow-band antenna carrier '_AThe number K' of the broadband time slices to which the narrow-band IQ sampling points of the antenna carriers can be mapped;

n 'of narrow band'_AMapping narrow-band IQ sampling points of antenna carriers to K ' time slices of a broadband, wherein the number of the narrow-band IQ sampling points which can be contained in the K ' time slices is greater than or equal to N '_AThe number of narrow-band IQ sampling points of each antenna carrier;

and mapping the narrow-band IQ sampling points to a basic frame of the common wireless interface by taking the mapped K' time slices as a unit so as to complete the mapping of the narrow-band IQ sampling points in the common wireless interface.

Preferably, the IQ sampling rate f of the narrow band is utilized_s' and frequency f of said wide band_sfThe number S' of the narrow-band IQ sampling points corresponding to each narrow-band antenna carrier is obtained by the following formula:

wherein the LCM is a function of calculating the least common multiple.

Preferably, the IQ sampling rate f of the narrow band is utilized_s' and frequency f of said wide band_sfN 'is obtained by the following formula'_ANumber of time-slices K' of the wideband to which the narrowband IQ samples of the individual antenna carriers can be mapped:

wherein the LCM is a function of calculating the least common multiple.

Preferably, the wideband is of an LTE standard, and the time slice is a subframe;

the number of narrow-band IQ sampling points which can be contained in the K' time slices is obtained according to the number of sampling points of the OFDM symbols of the LTE.

Preferably, the number of narrowband IQ samples that can be accommodated by the K' time slices is specifically obtained according to the number of samples of the OFDM symbol of LTE:

obtaining the number of sampling points which can be contained by each LTE subframe according to the number of sampling points of the OFDM symbols;

and obtaining the number of sampling points which can be held by K' sub-frames according to the number of sampling points which can be held by each sub-frame.

Preferably, the obtaining of the number of sampling points that can be accommodated by each LTE subframe according to the number of sampling points of the OFDM symbol specifically includes:

N_tti＝15·N_symbol

wherein, the N is_symbolNumber of samples of OFDM symbol for LTE, N_ttiThe number of sampling points that can be accommodated for each LTE subframe.

Preferably, if the number of narrow-band IQ sampling points which can be contained in K 'time slices is greater than N'_AThe number of narrowband IQ samples of each antenna carrier, the method further comprising:

filling residual sampling point capacity in K 'time slices with invalid IQ sampling points, wherein the residual sampling point capacity in the K' time slices is the number of narrow-band IQ sampling points which can be contained in the K 'time slices and the number of N'_AThe difference in the number of narrowband IQ samples for each antenna carrier.

An embodiment of the present invention further provides a data mapping apparatus, where the apparatus includes:

the device comprises a parameter acquisition unit, a parameter calculation unit, a narrow-band mapping unit and a wide-band mapping unit;

the parameter obtaining unit is used for obtaining the IQ sampling rate f of the narrow band_s', broadband frequency f_sfAnd number of narrowband antenna carriers N'_AThe frequency of the broadband is the reciprocal of a time slice, and the time slice refers to a time period specified in a broadband standard protocol;

the parameter calculation unit is used for utilizing the IQ sampling rate f of the narrow band_s' and frequency f of said wide band_sfObtaining the number S ' and N ' of narrow-band IQ sampling points corresponding to each narrow-band antenna carrier '_AThe number K' of the broadband time slices to which the narrow-band IQ sampling points of the antenna carriers can be mapped;

the narrowband mapping unit is used for mapping the narrowband to N'_AMapping narrow-band IQ sampling points of antenna carriers to K ' time slices of a broadband, wherein the number of the narrow-band IQ sampling points which can be contained in the K ' time slices is greater than or equal to N '_AThe number of narrow-band IQ sampling points of each antenna carrier;

the broadband mapping unit is used for mapping the narrow-band IQ sampling points to a basic frame of the common wireless interface by taking the mapped K' time slices as a unit so as to complete the mapping of the narrow-band IQ sampling points in the common wireless interface.

Preferably, if the number of narrow-band IQ sampling points which can be contained in K 'time slices is greater than N'_AThe number of narrow-band IQ samples of each antenna carrier, the apparatus further comprises:

a filling unit, configured to fill the remaining sampling point capacity in the K 'time slices with invalid IQ sampling points, where the remaining sampling point capacity in the K' time slices is the number of narrow-band IQ sampling points that can be accommodated by the K 'time slices and N'_AThe difference in the number of narrowband IQ samples for each antenna carrier.

The present invention also provides a data mapping apparatus, the apparatus comprising:

a processor;

a memory for storing the processor-executable instructions;

wherein the processor is configured to:

IQ sampling rate f using said narrow band_s' and frequency f of said wide band_sfObtaining the number S ' and N ' of narrow-band IQ sampling points corresponding to each narrow-band antenna carrier '_AThe number K' of the broadband time slices to which the narrow-band IQ sampling points of the antenna carriers can be mapped;

n 'of narrow band'_AMapping narrow-band IQ sampling points of antenna carrier to K' times of wide bandIn the inter-slice, the number of narrow-band IQ sampling points which can be contained by K 'time slices is greater than or equal to N'_AThe number of narrow-band IQ sampling points of each antenna carrier;

The invention obtains the IQ sampling rate f of the narrow band_s', broadband frequency f_sfAnd number of narrowband antenna carriers N'_AAnd using the IQ sampling rate f of the narrow band_s' and frequency f of said wide band_sfObtaining the number S ' and N ' of narrow-band IQ sampling points corresponding to each narrow-band antenna carrier '_AThe number K ' of the time slices of the broadband to which the narrow-band IQ sampling points of the antenna carriers can be mapped so as to obtain N ' of the narrow band '_AThe narrow-band IQ sampling points of the antenna carriers are mapped to K 'time slices of the broadband, the purpose of mapping the narrow-band IQ data to the broadband IQ data is achieved, and then the mapped K' time slices are taken as a unit, the narrow-band IQ sampling points are mapped to a basic frame of the common wireless interface, so that the mapping of the narrow-band IQ sampling points in the common wireless interface is completed. The present embodiment can realize transmission of narrowband IQ data without changing the existing CPRI, thereby improving the adaptability and utilization rate of the existing CPRI.

Drawings

In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments described in the present application, and other drawings can be obtained by those skilled in the art without creative efforts.

Fig. 1 is a basic configuration diagram of CPRI;

fig. 2 is a layered structure diagram of the CPRI protocol;

fig. 3 is a flowchart of a data mapping method according to an embodiment of the present invention;

fig. 4 is a schematic diagram of a frame structure of a PDT system in a data mapping method according to a second embodiment of the present invention;

fig. 5 is a schematic diagram illustrating a baseband modulation process of PDT in a data mapping method according to a second embodiment of the present invention;

fig. 6 shows one manner of filling IQ sampling points for PDT and invalid IQ sampling points in an LTE subframe in a data mapping method according to a second embodiment of the present invention;

fig. 7 is a schematic diagram of carrier multiplexing of an LTE antenna for compatible transmission of wideband and narrowband data in a data mapping method according to a second embodiment of the present invention;

fig. 8 is a block diagram of a data mapping apparatus according to a third embodiment of the present invention;

fig. 9 is a block diagram of a data mapping apparatus according to a fourth embodiment of the present invention.

Detailed Description

The CPRI protocol in the prior art provides an IQ data mapping method based on a wideband, and the basic idea is as follows: n of broadband_AIQ sampling points (IQ samples) of Antenna carriers (Antenna-carrier, AxC for short) are uniformly distributed in K basic frames, and the number S and N of IQ sampling points corresponding to each AxC are given_AA formula for calculating the number K of basic frames corresponding to an IQ sampling point of each Antenna carrier (Antenna-carrier, abbreviated as AxC). Generally, the number K of basic frames calculated by wideband IQ data transmission is only one digit, but if the formula is directly applied to mapping the narrowband IQ data, the number K of basic frames calculated is much higher than the number of basic frames calculated by wideband IQ data transmission.

For example, assume the sampling rate f of wideband IQ data_s30.72MHz due to f_cHas a constant value of 3.84MHz, and therefore has LCM (f)_s,f_c) 30.72MHz, and then:

assuming narrow bandsOf the IQ data is f_s＝38.4KHz＝3.84×10^-2MHz due to f_cHas a constant value of 3.84MHz, and therefore has LCM (f)_s,f_c) 3.84MHz, and further:

it can be seen that the difference between the K value of the transmission narrowband IQ data and the K value of the transmission wideband IQ data is large, and the existing CPRI is not suitable for transmission of narrowband IQ data.

In order to overcome the technical problem, the inventor proposes a data mapping method, and the basic idea is as follows: first narrow-band N'_AAnd mapping IQ sampling points corresponding to the antenna carriers to K 'time slices of the broadband, and then mapping the IQ sampling points of the narrowband to a basic frame of the universal public wireless interface by taking the mapped K' time slices as a unit. That is, the narrow-band IQ sampling points are "packaged" into the wide-band IQ sampling points, and then the mapping method for the wide-band IQ sampling points in the prior art is used for mapping, so that the existing CPRI can be used for continuously transmitting the narrow-band IQ data, and the adaptability and the utilization rate of the existing CPRI are improved.

In order to make the technical solutions of the present invention better understood, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

The first embodiment is as follows:

referring to fig. 3, it is a flowchart of a first embodiment of a data mapping method provided in the present invention.

The data mapping method provided by the embodiment comprises the following steps:

step S101: obtaining narrow-band IQ sampling rate f_s', broadband frequency f_sfAnd number of narrowband antenna carriers N'_A。

The Frequency of the wideband is the reciprocal of a time slice, which refers to a time period specified in the wideband protocol, such as a subframe, a time slot, a radio frame, an OFDM (Orthogonal Frequency Division Multiplexing) symbol, and the like.

Step S102: IQ sampling rate f using said narrow band_s' and frequency f of said wide band_sfObtaining the number S ' and N ' of narrow-band IQ sampling points corresponding to each narrow-band antenna carrier '_AThe number K' of wideband time-slices to which the narrowband IQ samples of the individual antenna carriers can be mapped.

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

wherein the LCM is a function of calculating the least common multiple.

N'_AThe number K' of wideband time slices to which the narrowband IQ samples of each antenna carrier can be mapped can be obtained by the following formula:

wherein the LCM is a function of calculating the least common multiple.

It should be noted that the above two formulas do not limit the present invention, and those skilled in the art can design the formulas according to the technical idea provided by the present invention and the practical application requirements.

Step S103: n 'of narrow band'_AThe narrow-band IQ samples of each antenna carrier are mapped into K' time slices of the wideband.

In order to realize mapping of narrow-band IQ data, the number of narrow-band IQ sampling points which can be contained in K 'time slices is required to be greater than or equal to N'_ANumber of narrow-band IQ sampling points of each antenna carrier。

In practical application, if the number of narrow-band IQ sampling points which can be contained in K 'time slices is greater than N'_AThe number of the narrow-band IQ sampling points of each antenna carrier can fill the residual sampling point capacity in the K 'time slices with invalid IQ sampling points, wherein the residual sampling point capacity in the K' time slices is the number of the narrow-band IQ sampling points which can be contained in the K 'time slices and the number of the N'_AThe difference in the number of narrowband IQ samples for each antenna carrier.

Step S104: and mapping the narrow-band IQ sampling points to a basic frame of the common wireless interface by taking the mapped K' time slices as a unit so as to complete the mapping of the narrow-band IQ sampling points in the common wireless interface.

In this embodiment, the narrow-band IQ sampling points are mapped to K' time slices of the wideband, which is equivalent to "changing the narrow-band IQ data into" wideband IQ data, so that after mapping, the wideband IQ data carrying the narrow-band IQ sampling points can be mapped to the basic frame of the CPRI by using the method for mapping the wideband IQ data in the prior art.

This embodiment obtains the narrow-band IQ sampling rate f_s', broadband frequency f_sfAnd number of narrowband antenna carriers N'_AAnd using the IQ sampling rate f of the narrow band_s' and frequency f of said wide band_sfObtaining the number S ' and N ' of narrow-band IQ sampling points corresponding to each narrow-band antenna carrier '_AThe number K ' of the time slices of the broadband to which the narrow-band IQ sampling points of the antenna carriers can be mapped so as to obtain N ' of the narrow band '_AThe narrow-band IQ sampling points of the antenna carriers are mapped to K 'time slices of the broadband, the purpose of mapping the narrow-band IQ data to the broadband IQ data is achieved, and then the mapped K' time slices are taken as a unit, the narrow-band IQ sampling points are mapped to a basic frame of the common wireless interface, so that the mapping of the narrow-band IQ sampling points in the common wireless interface is completed. The present embodiment can realize transmission of narrowband IQ data without changing the existing CPRI, thereby improving the adaptability and utilization rate of the existing CPRI.

Example two

The data mapping method provided by the invention is introduced in the embodiment by combining with the actual application scene. In this embodiment, the narrow band is in a PDT (policy Digital reporting or Public Digital reporting, Police Digital Trunking system or Public Digital Trunking) system, the wide band is in a LTE (Long Term Evolution) system, and this embodiment is to implement not only transmission of IQ data in the PDT system but also compatible transmission of IQ data in the PDT system and IQ data in the LTE system.

To better understand the data mapping method provided in this embodiment, first, a frame format and an IQ data format of the PDT cluster system will be described. Referring to fig. 4, which is a frame structure of the PDT system, in the frame structure, 60ms is divided into 2 slots each having a length of 30 ms. A slot consists of three parts: synchronous or embedded signaling, voice or data, and CACH (downstream) or guard interval (upstream). Each frame of data comprises 144 OFDM symbols at 4800Hz, and each slot carries 288bit of valid data due to 4FSK (Frequency-shift keying) modulation.

The PDT baseband modulation process is shown in fig. 5, i.e. mapping each 2 bits of data into a modulation symbol, then performing up-sampling and shaping filtering on the modulation symbol, and finally performing frequency modulation to generate a baseband signal. After modulation, the IQ data is up-sampled by a factor of a symbol rate. In this embodiment, the sampling rate is 8 times, i.e., f_sAn IQ sampling rate of 38400Hz, although other sampling rates may be used. Further, assume an antenna carrier number N 'of PDT'_A＝4。

In the embodiment, LTE subframes are used as time slices, and the time length of each subframe is 1ms, so the frequency f of the subframe_sfIs 1000Hz (inverse of the time length of a single subframe). If IQ sampling points of 4 antenna carriers of PDT are to be loaded into K' subframes of LTE for transmission, the following conditions should be satisfied:

wherein, every antenna carrier wave of PDT corresponds to S' IQ sampling points.

Since S 'and K' can only take integers, it is necessary to divide f into fractions_s' processing, i.e. in calculating f_s' and f_sfAt least common multiple of f, will be_s' multiply by 10, and correspondingly, f also needs to be set_sfMultiplied by 10.

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

wherein LCM is the least common multiple of the two.

In order to map IQ sampling points in 4 antenna carriers of PDT to 5 subframes of LTE, it is necessary to ensure that IQ sampling points of PDT which can be accommodated by the 5 subframes are greater than or equal to IQ sampling points in the four antenna carriers. Since each PDT antenna carrier corresponds to 384 IQ samples, the total number of 4 antenna carriers corresponds to 192 × 4 — 768 IQ samples, and it is necessary to ensure that 5 subframes can accommodate a minimum of 768 IQ samples.

The number of PDT sampling points which can be contained in the LTE subframe can be obtained according to the number of sampling points of an OFDM symbol of the LTE, and the number of sampling points of the OFDM symbol of the LTE can be obtained by looking up a table according to the bandwidth of the LTE. Assuming that the bandwidth of the LTE is 20MHz, the sampling point N of the OFDM symbol corresponding to the bandwidth can be found according to table 1_symbolIs 2048.

TABLE 1

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

Number of sampling points N that can be accommodated by one LTE subframe_ttiObtained according to the following formula:

N_tti＝15·N_symbol＝15×2048＝30720

therefore, the number of sampling points N that can be accommodated by K' sub-frames in this embodiment_g-gapObtained according to the following formula:

N_g-gap＝K'·N_tti＝5×30720＝153600

through calculation, the number (768) of IQ sampling points corresponding to four antenna carriers of PDT in this embodiment is much smaller than the number N of sampling points that can be accommodated by 5 LTE subframes_g-gap(153600) therefore mapping between IQ sample points for PDT and LTE subframes can be achieved.

Furthermore, it can also be verified whether K' LTE subframes can accommodate IQ sampling points of 4 antenna carriers of PDT by another way, that is:

wherein, the N is_C-AxCAnd INT is rounded for the maximum number of the PDT antenna carriers which can be multiplexed by K' LTE subframes. From this formula, one can obtain:

that is, in the present embodiment, the maximum number of antenna carriers of PDTs that can be multiplexed by 5 LTE subframes is 800, which far exceeds the number of antenna carriers (4) of actual PDTs, so IQ sampling points of 4 antenna carriers of PDTs can be "loaded" into the 5 LTE subframes.

In the present embodiment, after mapping the IQ sampling points of the PDT4 antenna carriers into 5 LTE subframes, the remaining sampling point capacity in the 5 LTE subframes can be filled with invalid IQ sampling points, that is, N sampling points can be filled_g-gap-4 × S' 153600-4 × 192 152832 invalid IQ samples, which are IQ samples used for padding, whose contents can be ignored at both the transmitting and receiving ends.

Fig. 6 shows one way of filling IQ sampling points for PDT and the invalid IQ sampling points in an LTE subframe, i.e. the IQ sampling points for PDT are concentrated together and the invalid IQ sampling points are concentrated together. In practical applications, there may be other filling manners, for example, the IQ sampling points of each antenna carrier are spaced apart from the invalid IQ sampling points, and the number of the invalid IQ sampling points filled in each interval may be the same.

After describing how to map the IQ sampling points of PDT into LTE sub-frames, how to perform data compatible transmission of wide and narrow bands is described below.

Assuming that the number N of LTE antenna carriers supported by CPRI is obtained according to calculation _A4, and only two antenna carriers need to be occupied by the LTEIQ sampling points actually needed to be transmitted, one of the remaining two antenna carriers can be used to multiplex the IQ sampling points for PDT, and the other is reserved for idle. Referring to fig. 7, AxC0 and AxC1 are used to "load" IQ sampling points for LTE, and AxC2 are used to "load" IQ sampling points for PDT, whichThe compatible transmission of the wide-band and narrow-band data is realized by the multiplexing mode.

In practical applications, if the REC is a data transmitter and the RE is a data receiver, the data mapping method may be performed by the REC, and the REC may be performed by the C&M (Control and Management) channel is N 'to the number of antenna carriers of PDT'_AAnd the position (such as AxC serial number 2) of the PDT mapping in the LTE is sent to the RE, the REC and the RE agree on a PDT sampling rate in advance, and after receiving the parameters, the RE can obtain the mapping relation of IQ data of the PDT in an LTE antenna carrier according to the parameters so as to receive the data sent by the REC according to the mapping relation. And if the RE is a data transmitter and the REC is a data receiver, the same is true.

Based on the data mapping method provided by the above embodiment, the embodiment of the present invention further provides a data mapping apparatus, and the working principle of the data mapping apparatus is described in detail below with reference to the accompanying drawings.

EXAMPLE III

Referring to fig. 8, this figure is a block diagram of a data mapping apparatus provided in this embodiment.

The data mapping apparatus provided in this embodiment includes:

a parameter obtaining unit 101, a parameter calculating unit 102, a narrow band mapping unit 103 and a wide band mapping unit 104;

the parameter obtaining unit 101 is configured to obtain an IQ sampling rate f of a narrow band_s', broadband frequency f_sfAnd number of narrowband antenna carriers N'_AThe frequency of the broadband is the reciprocal of a time slice, and the time slice refers to a time period specified in a broadband standard protocol;

the parameter calculating unit 102 is configured to utilize the IQ sampling rate f of the narrow band_s' and frequency f of said wide band_sfObtaining the number S ' and N ' of narrow-band IQ sampling points corresponding to each narrow-band antenna carrier '_AThe number K' of the broadband time slices to which the narrow-band IQ sampling points of the antenna carriers can be mapped;

the narrowband mapping unit103 for N 'of narrow band'_AMapping narrow-band IQ sampling points of antenna carriers to K ' time slices of a broadband, wherein the number of the narrow-band IQ sampling points which can be contained in the K ' time slices is greater than or equal to N '_AThe number of narrow-band IQ sampling points of each antenna carrier;

the wideband mapping unit 104 is configured to map the narrow-band IQ sampling points to a basic frame of the common wireless interface by taking the mapped K' time slices as units, so as to complete mapping of the narrow-band IQ sampling points in the common wireless interface.

Based on the data mapping method and device provided by the above embodiments, the embodiments of the present invention also provide a data mapping apparatus, and the working principle of the data mapping apparatus is described in detail below with reference to the accompanying drawings.

Example four

Referring to fig. 9, this figure is a block diagram of a data mapping apparatus provided in this embodiment.

In this embodiment, the data mapping apparatus includes

A processor 201;

a memory 202 for storing the processor-executable instructions; the processor and the memory are connected by a communication bus 203;

wherein the processor 201 is configured to:

Optionally, the IQ sampling rate f of the narrow band is utilized_s' and frequency f of said wide band_sfThe number S' of the narrow-band IQ sampling points corresponding to each narrow-band antenna carrier is obtained by the following formula:

wherein the LCM is a function of calculating the least common multiple.

Optionally, the IQ sampling rate f of the narrow band is utilized_s' and frequency f of said wide band_sfN 'is obtained by the following formula'_ANumber of time-slices K' of the wideband to which the narrowband IQ samples of the individual antenna carriers can be mapped:

wherein the LCM is a function of calculating the least common multiple.

Optionally, the wideband is of an LTE standard, and the time slice is a subframe;

Optionally, the number of narrowband IQ samples that can be accommodated by the K' time slices is specifically obtained according to the number of samples of the OFDM symbol of LTE:

Optionally, the obtaining of the number of sampling points that can be accommodated by each LTE subframe according to the number of sampling points of the OFDM symbol specifically includes:

N_tti＝15·N_symbol

Optionally, if the number of narrowband IQ sampling points that can be accommodated by K 'time slices is greater than N'_AThe number of narrowband IQ samples of each antenna carrier, the method further comprising:

filling the residual sampling point capacity in K' time slices with invalid IQ sampling pointsThe capacity of the middle residual sampling point is the number of narrow-band IQ sampling points which can be contained in K 'time slices and the number of N'_AThe difference in the number of narrowband IQ samples for each antenna carrier.

The 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 implemented by a hardware processor, or implemented by a combination of hardware and software modules in the processor. When implemented in software, the code implementing the above described functionality may be stored on a computer readable medium. Computer readable media includes computer storage media. A storage media may be any available media that can be accessed by a computer. Taking this as an example but not limiting: the computer-readable medium may be a Random Access Memory (RAM), read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), compact disc read-only memory (CD-ROM), or other optical disc storage, magnetic disk storage or other magnetic storage device, or any other medium that can be used to carry or store program code in the form of instructions or data structures and that can be accessed by a computer. The computer readable medium may be a Compact Disc (CD), a laser disc, a Digital Video Disc (DVD), a floppy disc or a blu-ray disc.

When introducing elements of various embodiments of the present invention, the articles "a," "an," "the," and "said" are intended to mean that there are one or more of the elements. The terms "comprising," "including," and "having" are intended to be inclusive and mean that there may be additional elements other than the listed elements.

The embodiments in the present specification are described in a progressive manner, and the same and similar parts among the embodiments are referred to each other, and each embodiment focuses on the differences from the other embodiments. Particularly, for the third embodiment and the fourth embodiment, since they are basically similar to the first embodiment and the second embodiment, the description is simple, and the relevant points can be referred to the partial description of the first embodiment and the second embodiment. The above-described apparatus embodiments are merely illustrative, and the units and modules described as separate components may or may not be physically separate. In addition, some or all of the units and modules may be selected according to actual needs to achieve the purpose of the solution of the embodiment. One of ordinary skill in the art can understand and implement it without inventive effort.

The foregoing is directed to embodiments of the present invention, and it is understood that various modifications and improvements can be made by those skilled in the art without departing from the spirit of the invention.

Claims

1. A method of data mapping, the method comprising:

mapping the narrow-band IQ sampling points to a basic frame of the common wireless interface by taking the mapped K' time slices as a unit so as to complete the mapping of the narrow-band IQ sampling points in the common wireless interface;

IQ sampling rate f using said narrow band_s' and frequency f of said wide band_sfThe number S' of the narrow-band IQ sampling points corresponding to each narrow-band antenna carrier is obtained by the following formula:

IQ sampling rate f using said narrow band_s' and frequency f of said wide band_sfN 'is obtained by the following formula'_ANumber of time-slices K' of the wideband to which the narrowband IQ samples of the individual antenna carriers can be mapped:

the LCM is a function of calculating the least common multiple.

2. The method of claim 1, wherein the wideband is of LTE standard, and the time slice is a subframe;

3. The method according to claim 2, wherein the number of narrowband IQ samples that the K' time slices can accommodate is specifically obtained from the number of samples of an OFDM symbol of LTE:

4. The method according to claim 3, wherein the obtaining of the number of sampling points that can be accommodated by each LTE subframe according to the number of sampling points of the OFDM symbol specifically includes:

N_tti＝15·N_symbol

5. The method of claim 1, wherein the number of narrow-band IQ samples that can be accommodated by K 'time slices is greater than N'_AThe number of narrowband IQ samples of each antenna carrier, the method further comprising:

6. An apparatus for data mapping, the apparatus comprising:

the broadband mapping unit is used for mapping the narrow-band IQ sampling points to a basic frame of the common public wireless interface by taking the mapped K' time slices as a unit so as to complete the mapping of the narrow-band IQ sampling points in the common public wireless interface;

the LCM is a function of calculating the least common multiple.

7. The apparatus of claim 6, wherein the number of narrow-band IQ samples that can be accommodated by K 'time slices is greater than N'_AThe number of narrow-band IQ samples of each antenna carrier, the apparatus further comprises:

8. A data mapping device, characterized in that the device comprises:

a processor;

a memory for storing the processor-executable instructions;

wherein the processor is configured to:

the LCM is a function of calculating the least common multiple.