CN109995486B

CN109995486B - Data transmission method and device

Info

Publication number: CN109995486B
Application number: CN201711482827.0A
Authority: CN
Inventors: 侯舒娟; 许健; 王新征
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2017-12-29
Filing date: 2017-12-29
Publication date: 2021-10-22
Anticipated expiration: 2037-12-29
Also published as: CN109995486A

Abstract

The application provides a data transmission method and device, which can avoid the situation that subcarriers shift to unavailable bandwidth. The method comprises the following steps: determining a subcarrier mapping manner of each resource unit of N resource units, wherein the N resource units belong to W resource units, the W resource units are continuous in a frequency domain, the subcarrier intervals of each resource unit of the W resource units are equal and have the same bandwidth, the bandwidth of each resource unit is a non-integral multiple of the subcarrier interval, the subcarrier mapping manners of at least two resource units of the W resource units are different, the subcarriers in each resource unit are continuous in the frequency domain, the subcarrier mapping manner of each resource unit is used for indicating the center frequency of each subcarrier of each resource unit, and the difference between the center frequencies of any two subcarriers of the W resource units is an integral multiple of the subcarrier interval; and performing data transmission according to the subcarrier mapping mode of each resource unit in the N resource units.

Description

Data transmission method and device

Technical Field

The present application relates to the field of communications, and more particularly, to a method and apparatus for data transmission.

Background

With the development of Mobile communication technology, conventional narrow-band systems, such as pan European Trunked Radio (TETRA) and Digital Mobile Radio (DMR), are also seeking broadband solutions. However, the existing spectrum resources are increasingly scarce, and it is difficult to find a vacant continuous broadband spectrum. An effective solution is carrier aggregation technology, which enables multiple discrete narrow bands to implement broadband data transmission, so as to meet the requirement of a narrow band system for broadband.

Currently, there is a carrier aggregation technology for physical layer aggregation. In the physical layer aggregation process, uniform Orthogonal Frequency Division Multiplexing (OFDM) modulation is performed on data of a plurality of component carriers, that is, uniform Inverse Fast Fourier Transform (IFFT) operation is performed on the data of the plurality of component carriers. The component carriers can be continuous or discontinuous, if the component carriers are discontinuous, 0 complementing operation is firstly carried out at the position of the unavailable component carrier, and then IFFT operation is carried out.

However, in narrowband systems, the bandwidth of the component carriers is often not an integer multiple of the subcarrier spacing. For example, in a TETRA system, the bandwidth of the component carrier is 25 kilohertz (kHz), and if a subcarrier spacing of 1.875kHz is used, the bandwidth of the component carrier is not an integer multiple of the subcarrier spacing. In this way, when the uniform IFFT operation is performed on the component carriers distributed discretely, since the subcarrier allocation is continuous within the aggregated bandwidth, there is a possibility that the subcarriers are shifted to an unusable bandwidth when the subcarriers are allocated. Therefore, in the physical layer aggregation technique of the narrowband system, it is necessary to avoid the subcarrier shifting onto the unavailable bandwidth.

In addition, when uplink transmission is performed without using carrier aggregation, in order for the base station to receive signals of multiple terminals at the same time, that is, to perform Fast Fourier Transform (FFT) operation only once, it is also necessary to avoid subcarrier shifting to an unavailable bandwidth.

Disclosure of Invention

The application provides a method and a device for data transmission, which are used for avoiding the deviation of subcarriers to an unavailable bandwidth, thereby realizing the uniform IFFT or FFT processing of data on a plurality of resource units.

In a first aspect, a method for data transmission is provided, including: determining a subcarrier mapping mode of each resource unit in N resource units, wherein the N resource units belong to W resource units, the W resource units are continuous in a frequency domain, subcarrier intervals of the W resource units are equal, the subcarrier mapping modes of at least two resource units in the W resource units are different, subcarriers in the resource units are continuous in the frequency domain, the subcarrier mapping mode of each resource unit is used for indicating the center frequency of each subcarrier of the resource units, the difference of the center frequencies of any two subcarriers of the W resource units is an integral multiple of the subcarrier interval, bandwidths of the resource units are the same, the bandwidth of each resource unit is a non-integral multiple of the subcarrier interval, N is not less than 1 and not more than 2, and N and W are integers; and performing data transmission according to the subcarrier mapping mode of each resource unit in the N resource units.

The "determining the subcarrier mapping manner of each of the N resource units" may be referred to as a determining step; the above-mentioned "performing data transmission according to the subcarrier mapping scheme for each of the N resource units" may be referred to as a transmission procedure.

It should be understood that the subcarriers herein are usable subcarriers, i.e., subcarriers for carrying data or signals.

Optionally, each resource unit of the N resource units is a component carrier. That is, the N resource units are aggregated when the base station performs downlink carrier aggregation or when the terminal performs uplink carrier aggregation.

It should be understood that, if each resource unit of the N resource units is a component carrier, the determining step may be performed by the terminal or the base station.

When a plurality of terminals each use one resource unit for uplink transmission, N is 1 when the terminal performs the determination step, and accordingly N >1 when the base station performs the determination step.

In the case where N >1, in the process where the transmission step is performed, when IFFT or FFT processing in OFDM is implemented, it is necessary to ensure that subcarriers cannot be spread over an unavailable resource unit. In the data transmission method provided in the embodiment of the present application, when the resource bandwidth is not an integer multiple of the subcarrier interval, the difference between the center frequencies of any two subcarriers in any two resource units in the multiple resource units is an integer multiple of the subcarrier interval, so that the subcarriers can be prevented from shifting to an unavailable bandwidth, and thus, a uniform IFFT or FFT processing on data in the multiple resource units can be realized.

In a possible implementation manner, the determining a subcarrier mapping manner of each resource unit of the N resource units includes: determining a subcarrier mapping mode of each resource unit in the N resource units according to a subcarrier mapping mode of each resource unit in the M resource units which are pre-configured and a position of each resource unit in the M resource units on a frequency domain, or according to a subcarrier mapping mode of each resource unit in the M resource units which are configured, a position of at least one resource unit in the M resource units on the frequency domain, a position of at least one resource unit in the M resource units and a bandwidth of each resource unit; wherein, M is a cyclic period of the subcarrier mapping manner, the M resource units belong to the W resource units and are consecutive in a frequency domain, subcarrier mapping manners of at least two resource units of the M resource units are different, a total bandwidth of the M resource units is an integer multiple of the subcarrier spacing, M is greater than or equal to 2 and less than or equal to W, and M is an integer.

In the embodiment of the application, the subcarrier mapping mode of each resource unit in the M resource units is determined through a preset subcarrier mapping mode, so that the base station can save signaling overhead for informing the subcarrier mapping mode of the resource unit of the terminal.

In one possible implementation manner, the starting frequency of each resource unit in the M resource units increases sequentially from the first resource unit to the mth resource unit; the determining the subcarrier mapping manner of each resource unit in the N resource units according to the preconfigured subcarrier mapping manner of the M resource units and the position of each resource unit in the M resource units on the frequency domain includes: the starting frequency f in the M resource units₀The subcarrier mapping mode of the resource unit is determined as that the starting frequency in the N resource units is f₁Or, the center frequency of the M resource units is f₀The subcarrier mapping mode of the resource unit is determined as that the center frequency in the N resource units is f₁The subcarrier mapping method of resource unit (c), wherein, | f₁-f₀0,% is absolute value operation,% is remainder operation,% is bandwidth of each resource unit, f₁>0，f₀>0，B>0; or, determining the subcarrier mapping mode of the resource unit with index i in the M resource unitsThe method is a subcarrier mapping mode of resource units with j as an index in the N resource units, wherein | j-i |% M is 0, | | | is absolute value operation,% is remainder calculation, i is greater than or equal to 0, j is greater than or equal to 0, and i and j are integers.

That is, the subcarrier mapping manner of resource units having integer multiples between the start frequency or the center frequency or the index is the same. According to the integer multiple relationship, the base station or the terminal can determine the subcarrier mapping mode of each resource unit.

It should be understood that the subcarrier mapping manner of the resource unit may also be determined by an integer multiple relationship between the ending frequencies of the resource units.

In one possible implementation, the number of subcarriers in each resource unit is the same.

Optionally, the number of subcarriers satisfies:

wherein,

indicating rounding-down, R is the number of the sub-carriers, B is the bandwidth of each resource unit, C is the interval of the sub-carriers, A is a preset value, A is not less than 0 and is an integer, R is not less than 1 and is an integer, 0<C<B。

It should be understood that, since B% C ≠ 0, there is also bandwidth unavailable in each resource unit, and this portion of bandwidth can be used to protect bandwidth. And, the larger a, the larger the guard bandwidth.

The data transmission method of the embodiment of the application can ensure enough number of subcarriers by reasonably setting the size of A, thereby improving the spectrum efficiency.

Further, if B/C is k1/k2, then M is k2, and k1 and k2 are all integers.

That is, if the total bandwidth of the resource units is an integer multiple of the subcarrier spacing, M resource units are required at minimum.

In one possible implementation, the bandwidth of each resource unit is 25kHz or 12.5kHz, and the subcarrier spacing is 1.875kHz, 3.75kHz, or 2 kHz.

It should be understood that the bandwidth size of the resource unit and the size of the subcarrier spacing are merely exemplary, and the bandwidth size of each resource unit and the size of the subcarrier spacing are not limited in the embodiments of the present application.

In a second aspect, an apparatus for data transmission is provided, where the apparatus is configured to perform the method of the first aspect or any possible implementation manner of the first aspect. In particular, the apparatus comprises means for performing the method of the first aspect described above or any possible implementation manner of the first aspect.

The data transmission apparatus according to the second aspect may be a base station or a terminal. Alternatively, the data transmission apparatus according to the second aspect may be a chip applied to a base station or a chip applied to a terminal.

In a third aspect, a communication system is provided, which comprises the apparatus for data transmission according to the second aspect.

In a fourth aspect, an apparatus for data transmission is provided, the apparatus comprising: a transceiver, a memory, and a processor. The processor is configured to control the transceiver to transceive signals, the memory is configured to store a computer program, and the processor is configured to retrieve and execute the computer program from the memory, so that the processor performs the method of the first aspect.

The apparatus for data transmission according to the fourth aspect may be a base station or a terminal.

In a fifth aspect, a communication system is provided, which comprises the base station and the terminal described above.

A sixth aspect provides a computer readable medium for storing a computer program comprising instructions for carrying out the method of the first aspect or any possible implementation of the first aspect.

In a seventh aspect, a computer program product is provided that comprises instructions, which when run on a computer, cause the computer to perform the method of the first aspect or any possible implementation manner of the first aspect.

In an eighth aspect, a chip system is provided, which comprises a processor for performing the functions referred to in the above aspects, such as generating, receiving, sending, or processing data and/or information referred to in the above methods. In one possible design, the system-on-chip further includes a memory for storing necessary program instructions and data. The chip system may be formed by a chip, or may include a chip and other discrete devices.

In the data transmission method provided in the embodiment of the present application, when the resource bandwidth is not an integer multiple of the subcarrier interval, the difference between the center frequencies of any two subcarriers in any two resource units in the multiple resource units is an integer multiple of the subcarrier interval, so that the subcarriers can be prevented from shifting to an unavailable bandwidth, and thus, a uniform IFFT or FFT processing on data in the multiple resource units can be realized.

Drawings

Fig. 1 is a schematic diagram of a communication system provided by an embodiment of the present application;

FIG. 2 is a schematic flow chart diagram of a method of data transmission according to one embodiment of the present application;

FIG. 3 is a schematic diagram of W resource units;

fig. 4 is a subcarrier mapping manner of resource units of one cycle according to an embodiment of the present application;

fig. 5 is a subcarrier mapping manner of resource units of one cycle according to another embodiment of the present application;

FIG. 6 is a schematic flow chart diagram illustrating one embodiment of a method for data transmission according to the present application;

fig. 7 is a schematic diagram illustrating a signal processing flow at a transmitting end according to the present application;

fig. 8 is a schematic diagram of a signal processing flow at a receiving end of the present application;

FIG. 9 is a schematic flow chart diagram illustrating another embodiment of a method for data transmission according to the present application;

FIG. 10 is a schematic flow chart diagram illustrating yet another embodiment of a method of data transmission according to the present application;

FIG. 11 is a schematic block diagram of an apparatus for data transmission of an embodiment of the present application;

FIG. 12 is a schematic block diagram of an apparatus for data transmission of an embodiment of the present application;

fig. 13 is a schematic block diagram of a base station provided in an embodiment of the present application;

fig. 14 is a schematic block diagram of a terminal provided in an embodiment of the present application.

Detailed Description

The technical solution in the present application will be described below with reference to the accompanying drawings.

It should be understood that the manner, the case, the category, and the division of the embodiments are only for convenience of description and should not be construed as a particular limitation, and features in various manners, the category, the case, and the embodiments may be combined without contradiction.

It should also be understood that the terms "first" and "second" in the examples of the application are used for distinguishing and should not be construed to limit the application in any way.

It should also be understood that, in the various embodiments of the present application, the sequence numbers of the processes do not mean the execution sequence, and the execution sequence of the processes should be determined by the functions and the inherent logic of the processes, and should not constitute any limitation to the implementation process of the embodiments of the present application.

In the embodiments of the present application, the terms "network" and "system" are often used interchangeably, but those skilled in the art can understand the meaning thereof. A terminal in the embodiments of the present application may refer to a User Equipment (UE), an access terminal, a subscriber unit, a subscriber station, a mobile station, a remote terminal, a mobile device, a User terminal, a wireless communication device, a User agent, or a User Equipment. The terminal may also be a cellular phone, a cordless phone, a Session Initiation Protocol (SIP) phone, a Wireless Local Loop (WLL) station, a Personal Digital Assistant (PDA), a handheld device with Wireless communication function, a computing device or other processing device connected to a Wireless modem, a vehicle-mounted device, a wearable device, and the like, and may be applied to a terminal in a second generation (2nd generation, 2G) system, a third generation (3rd generation, 3G) system, a fourth generation (4th generation, 4G) system, a fifth generation (5th generation, 5G) system, or other evolution systems that may appear in the future, and the like, which is not limited in the embodiment of the present application.

The base station according to the embodiment of the present application is an apparatus for providing a terminal with a wireless communication function. The base stations may include various forms of macro base stations, micro base stations, relay stations, access points, and the like. The Base Station may also be a Base Transceiver Station (BTS) in a Global System for Mobile communications (GSM) System or a Code Division Multiple Access (CDMA) System, a Base Station (NodeB, NB) in a Wideband Code Division Multiple Access (WCDMA) System, an evolved node b (eNB, eNodeB) in an LTE System, a wireless controller in a Cloud Radio Access Network (CRAN) scenario, or a Base Station in a 5G System or a new Radio Access technology (NR) Network, or a Base Station in another evolved System that may appear in the future. In systems using different radio access technologies, the names of devices that function as base stations may differ. It should be understood that the base station referred to in the embodiments of the present application includes both a base station in an existing communication system and a base station in a communication system that may appear in the future, and the embodiments of the present application are not limited thereto.

To facilitate understanding of the embodiments of the present application, first, concepts related to the embodiments of the present application will be briefly described.

(1) Sub-carrier wave

If not specifically stated, the subcarriers described in this application are usable subcarriers, i.e., subcarriers used for carrying data. In one resource unit, the remaining frequency domain resources except the available subcarriers are unavailable frequency domain resources.

(2) Subcarrier spacing

The subcarrier spacing characterizes the spectral width of the subcarriers, which is inversely proportional to the useful symbol duration. For example, in LTE, the subcarrier spacing may be 15kHz, in NR, the subcarrier spacing may be 7.5kHz, 15kHz, 30kHz, or other cases, in this application, the subcarrier spacing may be 1.875kHz, 3.75kHz, 2kHz, or other cases, and the size of the subcarrier spacing is not limited in this application. The subcarrier spacing and the symbol length can satisfy the following conditions: the ratio of the subcarrier spacing is 1/symbol length, for example, the symbol length here may be a symbol length including or not including a Cyclic Prefix (CP). The symbol may be an Orthogonal Frequency Division Multiplexing (OFDM) symbol or a variant of an OFDM symbol, such as a Discrete Fourier Transform Spread OFDM (DFT-S-OFDM) symbol, a filtered OFDM (filtered OFDM) symbol, and the like, but the embodiment of the present invention is not limited thereto.

Alternatively, in embodiments of the present application, the subcarrier spacing may be selected based on a tradeoff of overhead with cyclic prefix and susceptibility to doppler spread/shift and other types of frequency errors and inaccuracies.

(3) Resource unit

The resource unit in the embodiment of the present application mainly refers to resources in the frequency domain, for example, one resource unit may be considered as one carrier, one subband, or one channel.

For example, in LTE, the bandwidth of one resource unit is 180kHz, which includes 12 subcarriers, with the subcarrier spacing being 15 kHz. In the embodiment of the present application, the bandwidth of one resource unit may be 25kHz, 12.5kHz or other cases, and the embodiment of the present application does not limit the bandwidth size of the resource unit.

(4) Component carrier

Component Carriers (CCs) may also be referred to as Component carriers. The component carriers refer to respective aggregated carriers in carrier aggregation, and a single terminal may simultaneously use a plurality of component carriers through a carrier aggregation operation.

Fig. 1 is a schematic diagram of a communication system 100 suitable for use with embodiments of the present application. As shown in fig. 1, the communication system 100 may include a base station 102 and terminals 104 located within the coverage of the

base station

102 and 114. Base station 102 may communicate with multiple terminals, such as

terminal

104 and 114 shown in the figure. It should be appreciated that fig. 1 is a simplified schematic diagram that is merely exemplary for ease of understanding, and that other base stations and terminals may also be included in the communication system 100.

The communication system 100 may be a discrete narrowband system using subcarriers, e.g., TETRA, DMR, etc. The waveform used by the communication system 100 may be an OFDM waveform or a variation of an OFDM waveform having a subcarrier structure.

With the development of mobile communication technology, narrowband systems are also seeking broadband solutions. However, the existing spectrum resources are increasingly scarce, and it is difficult to find a vacant continuous broadband spectrum. An effective solution is carrier aggregation technology, which enables a plurality of discrete narrow bands to realize broadband data transmission, so as to meet the requirement of a narrow band system for broadband.

The existing carrier aggregation technologies are mainly classified into two categories, one category is Media Access Control (MAC) aggregation, and the technology is mainly characterized in that an independent OFDM signal processing process is performed on a data stream on each component carrier to generate a plurality of independent component carriers, and data aggregation operation is performed on an MAC layer. The other type is physical layer aggregation, which is mainly characterized in that the data of a plurality of component carriers are subjected to a uniform OFDM signal processing process, carrier aggregation is completed in a signal processing stage, the data on the plurality of component carriers are modulated and transmitted simultaneously, and uniform scheduling is performed on an upper layer.

Because each component carrier of the MAC layer carrier aggregation carries out signal processing independently, the aggregation mode needs a plurality of groups of signal processing modules; meanwhile, each component carrier needs independent transmission and control signaling, so that signaling overhead is large. When broadband data transmission is realized by using a plurality of discrete narrow bands, tens of discrete component carriers, even hundreds of discrete component carriers, are sometimes required to be aggregated into one broadband transmission system, and therefore, MAC layer carrier aggregation is not suitable for such application scenarios, otherwise, excessive hardware overhead and signaling overhead are caused. Therefore, when broadband data transmission is implemented using a plurality of discrete narrow bands, a physical layer aggregation scheme is used.

In the physical layer aggregation process, the data of a plurality of component carriers are subjected to unified OFDM modulation, that is, the data of the plurality of component carriers are subjected to unified IFFT operation, and the component carriers may be continuous or discontinuous, and if the component carriers are discontinuous, 0 compensation operation is performed at the position where the component carriers are not available, and then IFFT operation is performed.

However, in practical applications, the bandwidth of the component carriers is often not an integer multiple of the subcarrier spacing. For example, in a TETRA system, the bandwidth of the component carrier is 25kHz, and if a subcarrier spacing of 1.875kHz is used, the bandwidth of the component carrier is not an integer multiple of the subcarrier spacing. In this way, when the uniform IFFT operation is performed on the component carriers distributed discretely, since the subcarrier allocation is continuous within the aggregated bandwidth, there is a possibility that the carrier is shifted to an unusable bandwidth when the subcarrier is allocated. Therefore, in the physical layer aggregation technique of the narrowband system, it is necessary to avoid the subcarrier shifting onto the unavailable bandwidth.

Meanwhile, if carrier aggregation is not used, in order to allow the base station to receive signals of all terminals at the same time during uplink transmission, that is, to perform only one FFT operation, it is also necessary to avoid subcarrier shifting to an unavailable bandwidth.

In view of this, the present application provides a data transmission method, which may be applied in uplink transmission in an uplink and downlink carrier aggregation scenario, and may also be applied in uplink transmission in a non-carrier aggregation scenario. In a carrier aggregation scene, the method can avoid the deviation of useful subcarriers to an unavailable bandwidth by making the difference between the center frequencies of any two subcarriers of a plurality of component carriers be integral multiples of the subcarrier interval, so that a terminal or a base station can realize uniform IFFT operation on a plurality of resource units. In uplink transmission under a non-carrier aggregation scene, the method can avoid the situation that the subcarriers deviate to an unavailable bandwidth by using the method that the difference between the center frequencies of any two subcarriers in a resource unit for uplink transmission is integral multiple of the interval of the subcarriers, so that a base station can realize uniform FFT operation on a plurality of resource units.

Hereinafter, the method of data transmission according to the embodiment of the present application will be described in detail with reference to fig. 2.

Fig. 2 is a schematic interaction diagram of an example of a method of data transmission according to an embodiment of the present application. It should be understood that fig. 2 shows detailed steps or operations of the method 200, but these steps or operations are merely examples, and other operations may also be performed or only some of the operations of fig. 2 may be performed by embodiments of the present application.

The method 200 may be applied to the system 100 shown in fig. 1, but the embodiment of the present application is not limited thereto. The method 200 may be performed by a base station or a terminal. The base station may correspond to the base station 102 in the communication scenario, and the terminal may correspond to any one of the

terminals

104 and 114 in the communication scenario. As shown in fig. 2, the method 200 includes a step S210 and a step S220.

S210, determining a subcarrier mapping mode of each resource unit in the N resource units.

Specifically, the subcarrier mapping manner of each resource unit is used to indicate a center frequency of each subcarrier of the resource unit, and determining the subcarrier mapping manner of each resource unit in the N resource units is equivalent to determining a distribution situation of available subcarriers in each resource unit in the N resource units or a center frequency of each available subcarrier.

The N resource units belong to W resource units, namely the N resource units are part or all of the W resource units, N is more than or equal to 1 and less than or equal to W, W is more than or equal to 2, and N and W are integers. The W resource units are consecutive in the frequency domain, that is, for two adjacent resource units in the frequency domain, the end position of the first resource unit in the frequency domain is the start position of the second resource unit in the frequency domain. The bandwidth of each of the W resource units is the same.

For example, fig. 3 shows a schematic diagram of W resource units. As shown in fig. 3, the W resource units may be a plurality of resource units consecutive on a frequency band #1, and the frequency band #1 may be a spectrum resource of the system shown in fig. 1. Band #1 is divided into W resource units, denoted as: resource unit #1 to resource unit # W. The N resource units may be any N resource units from resource unit #1 to resource unit # W, and the N resource units may be continuous or discontinuous in the frequency domain, which is not limited in the embodiment of the present application.

In the conventional scheme, the subcarrier mapping manners of each resource unit in one communication system are the same, but in the present application, the subcarrier mapping manners of at least two resource units in the W resource units are different. That is, there are at least two resource units in the W resource units, and the subcarrier distribution in the two resource units is different. The subcarrier spacing of each resource unit in the W resource units is equal, and the bandwidth of each resource unit is not integral multiple of the subcarrier spacing. For example, the bandwidth of a resource unit may be 25kHz and the subcarrier spacing may be 1.875kHz, in which case the bandwidth of each resource unit is not an integer multiple of the subcarrier spacing. In addition, the subcarriers in each of the W resource units are contiguous in the frequency domain, i.e., in one resource unit, there are no unavailable frequency domain resources among the subcarriers.

Since the difference between the center frequencies of any two subcarriers of the W resource units is an integer multiple of the subcarrier spacing, that is, the subcarriers of the W resource units are aligned, the difference between the center frequencies of any two subcarriers of the N resource units is also an integer multiple of the subcarrier spacing. That is, if N >1, the difference between the center frequency of any subcarrier in any one of the N resource units and any subcarrier in any other resource unit except the resource unit is an integer multiple of the subcarrier spacing. If N is 1, the difference between the center frequencies of any two subcarriers in the resource unit is an integer multiple of the subcarrier spacing.

It should be understood that, in the embodiment of the present application, the subcarrier mapping manners of the N resource units may be the same or different, and the embodiment of the present application does not limit this. In addition, the N resource units may be continuous or discontinuous in the frequency domain, which is not limited in this embodiment of the present application.

S220, data transmission is performed according to the subcarrier mapping scheme of each resource unit of the N resource units.

After determining the subcarrier mapping scheme for each of the N resource units, data may be received or transmitted according to the subcarrier mapping scheme for each of the N resource units.

Optionally, as an embodiment of the present application, each resource unit of the N resource units is a component carrier. That is, the N resource units are aggregated when the base station performs downlink carrier aggregation or when the terminal performs uplink carrier aggregation.

It should be understood that if each of the N resource units is a component carrier, S210 may be performed by the terminal or the base station.

When a plurality of terminals each use one resource unit for uplink transmission, N is 1 when S210 is executed by the terminal, and N >1 when S210 is executed by the base station.

In the case where N >1, in the process where S220 is executed, when IFFT or FFT processing in OFDM is implemented, it is necessary to ensure that subcarriers cannot be spread over an unavailable resource unit.

Optionally, as an example of S220, the subcarrier mapping manner of each of the N resource units may be determined according to a subcarrier mapping manner of each of the M resource units that are preconfigured and a position of each of the M resource units on the frequency domain, or according to a subcarrier mapping manner of each of the M resource units that are preconfigured, a position of at least one of the M resource units on the frequency domain, a position of at least one of the M resource units on the M resource units, and a bandwidth of each resource unit.

Wherein, M is a cyclic period of the subcarrier mapping mode, and the M resource units are continuous in the frequency domain. And the M resource units belong to the W resource units, the total bandwidth of the M resource units is an integral multiple of the subcarrier spacing, M is more than or equal to 2 and less than or equal to W, and M is an integer. In addition, at least two resource units of the M resource units have different subcarrier mapping schemes, that is, the subcarrier mapping schemes of the M resource units are not all the same.

It should be understood that the position of at least one resource unit of the M resource units in the M resource units means that the at least one resource unit is the fourth resource unit of the M resource units, respectively. Knowing the position of at least one of the M resource units in the frequency domain, the position of at least one of the M resource units in the M resource units, and the bandwidth of each resource unit, the position of each of the M resource units in the frequency domain can be known.

Specifically, the mapping manner of the M resource units may be predefined by the base station configuration system, and the mapping manner of the W resource units is cycled by taking the mapping manner of the M resource units as a cycle period. That is, in any two cyclic periods, the subcarrier mapping method of resource units having an integer multiple relationship in position in the frequency domain is the same. Thus, once the position of one resource unit in the frequency domain is determined, the subcarrier mapping method of the resource unit can be determined.

For example, the starting positions (i.e., starting frequencies) of the 13 resource units (denoted by resource unit #1 to resource unit #13) in the frequency domain increase in order from the first resource unit to the W-th resource unit, for example, with M being 3 and W being 13. If the M resource units are resource unit #3 to resource unit #5, resource unit #1 and resource unit #2 have the same subcarrier mapping scheme as resource unit #4 and resource unit #5, respectively, resource unit #6 to resource unit #8 have the same subcarrier mapping scheme as resource unit #3 to resource unit #5, resource unit #9 to resource unit #11 have the same subcarrier mapping scheme as resource unit #3 to resource unit #5, respectively, and resource unit #12 and resource unit #13 have the same subcarrier mapping scheme as resource unit #3 and resource unit #4, respectively. If the M resource units are resource unit #1 to resource unit #3, resource unit #4 to resource unit #6 are sequentially mapped to the same subcarriers as resource unit #1 to resource unit #3, resource unit #7 to resource unit #9 are sequentially mapped to the same subcarriers as resource unit #1 to resource unit #3, resource unit #10 to resource unit #12 are sequentially mapped to the same subcarriers as resource unit #1 to resource unit #3, and resource unit #13 is mapped to the same subcarriers as resource unit # 1.

Fig. 4 and 5 show subcarrier mapping schemes for resource units of one cycle, respectively. In fig. 4 and 5, M is 3, the bandwidth of the resource unit is 25kHz, and the subcarrier spacing is 1.875 kHz.

Fig. 4 shows a subcarrier mapping scheme of 3 resource units. Looking from left to right in fig. 4, after 11 subcarriers in resource unit # a are allocated, since the bandwidth of resource unit of 25kHz is not an integer multiple of the subcarrier spacing of 1.875kHz, 1/3 redundant subcarriers in resource unit # a will be combined with 2/3 subcarriers in resource unit # B to form a complete subcarrier. The spliced sub-carriers are regarded as invalid sub-carriers, and 0-complementing operation is performed during the IFFT operation. Then 11 sub-carriers in resource unit # B are allocated, and the resource unit # B is left

The subcarriers, the remaining part and 1/3 subcarriers in resource unit # C are grouped into two complete subcarriers, which are also regarded as invalid subcarriers. Next, 11 subcarriers of resource unit # C are allocated. Two unavailable subcarriers are provided at both ends of the resource unit # a and the resource unit # C, which can be used as a guard bandwidth or perform a 0-complementing operation when performing an IFFT operation.

FIG. 5 shows another sub-set of 3 resource unitsAnd (4) a carrier mapping mode. In fig. 5, one unusable subcarrier is present at each end of resource unit # a and resource unit # C, and resource unit # a is adjacent to resource unit # B

The subcarriers are unavailable subcarriers, and the resource unit # B is adjacent to the resource unit # A

The subcarriers are unavailable subcarriers and adjacent to resource unit # C

The subcarriers are unusable subcarriers, and the resource unit # C is adjacent to the resource unit # B

The number of subcarriers is an unavailable subcarrier.

It should be understood that these unusable bandwidths in fig. 4 and 5 are equal to subcarriers spaced apart by an integer multiple of a subcarrier, and that a fractional multiple of subcarriers are both unusable frequency domain resources. The resource units # a to # C indicated in fig. 4 and 5 may be the resource units #3 to #5 in the above example, or may be the resource units #1 to #3 in the above example. It should also be understood that, in the embodiment of the present application, only M is taken as an example, and if the bandwidth of a resource unit is 25kHz and the subcarrier spacing is 1.875kHz, M may be a positive integer multiple of 3.

Further, assuming that the M resource units have sequentially increasing starting frequencies in the order from the first resource unit to the mth resource unit, any of the following manners may be adopted. And determining the subcarrier mapping mode of each resource unit in the N resource units.

In a first mode

Setting the starting frequency of the M resource units as f₀The subcarrier mapping mode of the resource unit is determined as that the starting frequency in the N resource units is f₁The subcarrier mapping method of resource unit (c). Wherein f is₀And f₁Satisfies the following conditions:

|f₁-f₀|％(M*B)＝0， (1)

| | is the operation of taking the absolute value,% is the operation of solving the remainder, B is the bandwidth of each resource unit, f₁>0，f₀>0，B>0。

In other words, if the starting frequencies of the W resource units sequentially increase in the order from the first resource unit to the W-th resource unit, the subcarrier mapping scheme of the resource unit whose difference between the starting frequencies of the N resource units and the M resource units is an integral multiple of the total bandwidth of the M resource units may be used as the subcarrier mapping scheme of the resource unit in the M resource units. That is, the subcarrier mapping method of two resource units, in which the difference between the starting frequency of the N resource units and the starting frequency of the M resource units is an integer multiple of the total bandwidth of the M resource units, is the same.

For example, if the bandwidth of the resource unit is 25kHz, the M resource units may be three resource units with starting frequencies of 150MHz, 150.025MHz, and 150.05MHz respectively in the W resource units, and the starting frequencies of the N resource units are two resource units of 150.075MHz and 150.125MHz respectively, so that the subcarrier mapping manner of the resource unit with the starting frequency of 150.075MHz is the same as that of the resource unit with the starting frequency of 150MHz, and the subcarrier mapping manner of the resource unit with the starting frequency of 150.125MHz is the same as that of the resource unit with the starting frequency of 150.05 MHz.

Note that the present embodiment does not limit the subcarrier mapping method according to the starting frequency resource unit. For example, the center frequency of the M resource units may be f according to the above formula (1)₀The subcarrier mapping mode of the resource unit is determined as that the center frequency in the N resource units is f₁The subcarrier mapping method of resource unit (c). Or, according to the above formula (1), the ending frequency in the M resource units is f₀The subcarrier mapping mode of the resource unit is determined as f, the end frequency in the N resource units₁The subcarrier mapping method of resource unit (c). It should be understood that the ending frequency of a resource unit is the resourceFrequency of end position of unit.

Mode two

And determining the subcarrier mapping mode of the resource unit with the index of i in the M resource units as the subcarrier mapping mode of the resource unit with the index of j in the N resource units. Wherein i and j satisfy:

|j-i|％M＝0， (2)

and | | is absolute value operation,% is remainder operation, i is more than or equal to 0, j is more than or equal to 0, and i and j are integers.

In other words, if the starting frequency of each resource unit in the W resource units increases sequentially from the first resource unit to the W-th resource unit, the subcarrier mapping scheme of the resource unit whose index difference from the index in the M resource units in the N resource units is M-times greater than the index in the M resource units may be used as the subcarrier mapping scheme of the resource unit in the M resource units. That is, the subcarrier mapping method is the same for two resource units of the N resource units that are integer multiples of M, the index difference being the M among the M resource units.

For example, if the M resource units are resource units with indexes 0, 1, and 2 (i.e., resource unit #1 to resource unit # 3), and the N resource units are resource units with indexes 4 and 6 (i.e., resource unit #5 and resource unit #7), respectively, the resource unit with index 4 has the same subcarrier mapping method as the resource unit with index 1, the resource unit with index 6 has the same subcarrier mapping method as the resource unit with index 0, i.e., resource unit #5 has the same subcarrier mapping method as resource unit #2, and resource unit #7 has the same subcarrier mapping method as resource unit # 1.

It should be understood that the index of W resource units may start from 0 or 1, which is not limited in this embodiment of the application.

Optionally, as an embodiment of the present application, the number of subcarriers per resource unit of the W resource units may be the same.

For example, the number R of subcarriers in each of the N resource units is determined according to the following formula (3):

wherein,

indicating rounding down, B is the bandwidth of each resource unit, C is the subcarrier spacing, A is a preset value, A is not less than 0, A is an integer, R is not less than 1, R is an integer, 0<C<B。

Assuming, for example, that the bandwidth per resource unit is 25kHz, the subcarrier spacing is 1.875kHz, and a is 2, it can be obtained from equation (3),

i.e. the number of subcarriers in each resource unit is 11. As another example, assuming that the bandwidth per resource unit is 12.5kHz, the subcarrier spacing is 1.875kHz, and a is 2, it can be obtained from equation (3),

i.e. the number of subcarriers per resource unit is 4.

It should be understood that since B% C ≠ 0, there is also unusable bandwidth in each component carrier, which can be used for guard bandwidth. For example, according to the formula (3), the larger a is, the larger the guard bandwidth is.

The data transmission method of the embodiment of the application can ensure enough number of subcarriers by reasonably setting the size of A, thereby improving the spectrum efficiency. It should also be understood that the embodiments of the present application do not limit the number of subcarriers in each component carrier, nor the manner of determining the number of subcarriers in each component carrier.

Further, if B/C is k1/k2, then M is k2, and k1 and k2 are all integers.

The method of data transmission according to the present application is described in more detail below with reference to fig. 6 to 10.

Fig. 6 is a schematic flow chart of a method of data transmission. The method shown in fig. 6 may be applied to a scenario in which a terminal performs uplink transmission in a carrier aggregation manner. It should be understood that the method shown in fig. 6 can be applied to the system shown in fig. 1, and terminal #1 in the following description can be any one of

terminals

104 and 114, and base station #1 can be base station 102.

S601, base station #1 identifies the N resource units.

Specifically, in both uplink and downlink transmissions, the base station #1 determines whether to perform carrier aggregation, and if the base station #1 determines to use the carrier aggregation technique in the uplink transmission, the component carrier allocated to the terminal #1, that is, the N resource units, is first determined.

S602, the base station #1 determines a subcarrier mapping scheme for each of the N resource units.

For example, the base station #1 may determine the subcarrier mapping manner of each resource unit in the N resource units according to a preset subcarrier mapping manner of M resource units. Specifically, reference may be made to the description related to S220 above, and for brevity, the description is not repeated here.

S603, base station #1 transmits instruction information #1 to terminal #1, and instruction information #1 instructs the N resource units.

Specifically, base station #1 specifies the component carrier assigned to terminal #1, transmits instruction information #1 to terminal #1, and instructs terminal #1 of the component carrier assigned to terminal #1 by base station #1, that is, the N resource units, via instruction information # 1.

Alternatively, the indication information #1 may be carried by a Physical Downlink Control Channel (PDCCH).

Further, the indication information #1 may occupy Y bits, N ≦ Y ≦ W, and Y is an integer.

If the system can use any resource unit in the W resource units to which the N resource units belong, Y may be equal to W, and if the system can only use a part of the W resource units, Y is equal to the total number of the resource units that the system can use, and Y bits are in one-to-one correspondence with the resource units that the system can use. For example, in the Y bits, 0 indicates that the resource unit cannot be used for carrier aggregation, and 1 indicates that the resource unit can be used for carrier aggregation. For example, when the Y bits are 11010111, it indicates that base station #1 allocates resource unit #1, resource unit #2, resource unit #4, and resource units #6 to #8 to terminal #1 so that terminal #1 performs aggregation using these resource units.

In S604, the terminal #1 specifies the N resource units based on the instruction information # 1.

For example, the terminal #1 can specify, based on the Y bits, that the N resource units are the resource unit #1, the resource unit #2, the resource unit #4, and the resource units #6 to #8, respectively.

In S605, the terminal #1 specifies a subcarrier mapping scheme for each of the N resource units.

As an example, the terminal #1 and the base station #1 may store the preset subcarrier mapping manners of M resource units in advance, and then after determining the N resource units, the terminal #1 may determine the subcarrier mapping manner of each resource unit in the N resource units according to the subcarrier mapping manners of the M resource units. Specifically, reference may be made to the description related to S220 above, and for brevity, the description is not repeated here.

As another example, the indication information #1 may also include information of the subcarrier mapping scheme of each of the N resource units, that is, the terminal #1 may determine the subcarrier mapping scheme of each of the N resource units according to the indication information # 1. Alternatively, base station #1 may also send another indication information to terminal #1, for example, written as: indication information #2, and indication information #2 may be used to indicate a subcarrier mapping scheme for each of the N resource units.

In S606, the terminal #1 can transmit a signal to the base station #1 according to the subcarrier mapping scheme for each of the N resource units. Accordingly, base station #1 receives the signal transmitted by terminal # 1.

As an example, fig. 7 shows a signal processing flow diagram of a transmitting end. It should be understood that fig. 7 is only an illustration and should not be construed as limiting the present application in any way.

As shown in fig. 7, taking the transmitting end as terminal #1 as an example, information bit S1 generated by terminal #1 is scrambled by Cyclic Redundancy Check (CRC), and then sequentially subjected to channel coding processing and modulation (or constellation mapping) processing, so as to obtain a modulation symbol. Then, the modulation symbols are mapped to the subcarriers in the N resource units, and the serial data stream is converted into a parallel data stream. Then, the multi-path frequency domain signal is subjected to uniform IFFT processing, the multi-path frequency domain signal is converted into a multi-path time domain signal, and Cyclic Prefix (CP) processing is performed on the multi-path time domain signal to obtain a CP-processed signal. And finally, filtering the signal subjected to the CP processing, and performing up-conversion processing on the filtered signal so as to up-convert the filtered signal to radio frequency, thereby obtaining a radio frequency signal S2 and transmitting the radio frequency signal S2.

In the physical layer carrier aggregation, the usable component carriers are crossed with the unusable component carriers, and when IFFT processing in OFDM is implemented, for example, IFFT processing in fig. 7, the unusable component carriers need to be complemented by 0. Specifically, the positions of the subcarriers complementary to 0 and the subcarriers carrying data in the aggregated component carriers, that is, the center frequency of the available subcarriers, need to be determined to ensure that the subcarriers of the available component carriers cannot be extended to the unavailable component carriers. In this embodiment, after determining the subcarrier mapping manner of each resource unit in the N resource units, terminal #1 may obtain the center frequency of the available subcarriers, so as to perform subcarrier mapping and IFFT processing. For example, if the N resource units are resource unit #1 and resource unit #3 shown in fig. 3, respectively, and the subcarrier mapping manners of resource unit #1 and resource unit #3 are the same as the subcarrier mapping manners of resource unit # a and resource unit # C shown in fig. 4, respectively, and the subcarrier mapping manner of resource unit #2 is the same as the subcarrier mapping manner of resource unit # B shown in fig. 4, then the subcarriers capable of carrying data are the available subcarriers in resource unit # a and resource unit # C, i.e., the subcarriers represented by the small boxes without padding in resource unit # a and resource unit # C shown in fig. 4, for each available subcarrier in resource unit #2, each invalid subcarrier with a subcarrier spacing of bandwidth in resource unit #1 to resource unit #3, and each invalid subcarrier with a subcarrier spacing of bandwidth pieced by a fractional number of subcarriers, the 0-complementing treatment is required.

Upon receiving the signal transmitted by terminal #1, base station #1 can perform a corresponding reception process.

For example, fig. 8 shows a schematic signal processing flow diagram at the receiving end. It should be understood that fig. 8 is only an exemplary illustration and should not be construed as limiting the present application in any way.

As shown in fig. 8, taking the receiving end as the base station #1 as an example, after receiving the rf signal S2, the base station #1 performs down-conversion and filtering processing on the rf signal S2, down-converts the rf signal S2 to the baseband, and performs filtering processing on the obtained baseband signal to filter out-of-band interference. Then, base station #1 performs CP removal processing on the filtered signal to obtain a CP-removed signal, performs FFT processing on the CP-removed signal to convert the time domain signal into a frequency domain signal, and then base station #1 performs subcarrier extraction on the FFT-processed signal to extract a modulation symbol on an available subcarrier. Here, if there are pilot symbols on the available subcarriers, the pilot symbols are also removed and only the data symbols are extracted. Finally, the obtained adjustment symbol is demodulated, channel decoded and CRC descrambled in sequence to obtain information bits S1.

It should be understood that the signal processing flows shown in fig. 7 and 8 are only schematic illustrations, and other flows or operations, or only some of the flows or operations, may be performed during actual signal receiving and transmitting processes. In addition, the embodiments of the present application only briefly describe the signal processing flow shown in fig. 7 and fig. 8, and specific operations in the flow may refer to the prior art.

In the method for data transmission provided in the embodiment of the present application, since the difference between the center frequencies of any two subcarriers in any two resource units in a plurality of resource units is an integer multiple of the subcarrier interval, the terminal can implement uniform IFFT processing on data in the plurality of resource units.

Fig. 9 is a schematic flow chart of another method of data transmission. The method shown in fig. 9 may be applied to a scenario in which a base station performs downlink transmission in a carrier aggregation manner. It should be understood that the method shown in fig. 9 can be applied to the system shown in fig. 1, and the base station #1 can be the base station 102, and the terminal #2 can be any one of the

terminals

104 and 114.

S901, base station #1 identifies the N resource units.

Specifically, when the base station #1 determines to use the carrier aggregation technique in downlink transmission to the terminal #2, the component carrier used, that is, the N resource units, is first determined. S902, the base station #1 determines the subcarrier mapping scheme for the N resource units.

S903, base station #1 transmits instruction information #3 to terminal # 2.

After identifying the component carrier used, base station #1 transmits instruction information #3 to the terminal, and instructs the terminal #2 to receive the signal in the N resource units by the instruction information #3 indicating the component carrier scheduled by the base station.

Alternatively, the indication information #3 may further include information of a subcarrier mapping scheme of each of the N resource units, and the terminal #2 may determine the subcarrier mapping scheme of each of the N resource units according to the information of the subcarrier mapping scheme of each of the N resource units. Alternatively, base station #1 may also send another indication information to terminal #2, for example, written as: indication information #4, and indication information #4 may be used to indicate a subcarrier mapping scheme for each of the N resource units.

In S904, the terminal #2 specifies the N resource units based on the instruction information # 3.

S905, terminal #2 determines a subcarrier mapping scheme for each of the N resource units.

For example, the terminal #2 may determine the subcarrier mapping manner of each resource unit in the N resource units according to the preset subcarrier mapping manner of the M resource units. Specifically, reference may be made to the description related to S220 above, and for brevity, the description is not repeated here. For another example, terminal #2 may determine the subcarrier mapping scheme for each of the N resource units based on the information of the subcarrier mapping scheme for each of the N resource units in indication information #3 or based on indication information # 4.

S906, base station #1 transmits a signal to terminal # 2. Accordingly, terminal #2 receives the signal transmitted by base station # 1.

For example, the base station #1 may process the information bits to be transmitted according to the signal processing flow shown in fig. 7 and according to the subcarrier mapping manner of each resource unit in the N resource units, so as to obtain a radio frequency signal and transmit the radio frequency signal.

After receiving the signal transmitted by base station #1, terminal #2 may process the received signal according to the subcarrier mapping scheme for each of the N resource units according to the signal processing flow shown in fig. 8, for example, to obtain the information bits transmitted by base station # 1.

In the data transmission method provided by the embodiment of the present application, because the difference between the center frequencies of any two subcarriers in any two resource units in a plurality of resource units is an integral multiple of the subcarrier interval, the base station can implement uniform IFFT processing on data in the plurality of resource units.

Fig. 10 is a schematic flow chart of yet another method of data transmission. The method shown in fig. 10 is applied to a scenario where a base station performs unified FFT processing on signals from a plurality of terminals. It should be understood that the method shown in fig. 10 can be applied to the system shown in fig. 1, where base station #1 can be base station 102, terminal #3 can be one of

terminals

104 and 114, and terminal #4 can be another of

terminals

104 and 114. It should be further understood that, in the embodiment of the present application, only base station #1 is used to perform unified FFT processing on signals from two terminals, and base station #1 may also perform unified FFT processing on signals from three or more terminals, which is not limited in the present application.

S1001, base station #1 specifies the N resource units.

Specifically, base station #1 determines resource units allocated to terminal #3 and terminal #4, for example, the resource unit #1 is the resource unit allocated to terminal #3, and the resource unit allocated to terminal #4 is resource unit #4, that is, the N resource units are resource unit #1 and resource unit #4, respectively.

S1002, the base station #1 adopts the subcarrier mapping scheme of the N resource units.

That is, base station #1 specifies the subcarrier mapping scheme for resource unit #1 and resource unit # 4. For example, the base station #1 may determine the subcarrier mapping manners of the resource unit #1 and the resource unit #4 according to the subcarrier mapping manners of the preset M resource units. Specifically, reference may be made to the description related to S220 above, and for brevity, the description is not repeated here.

S1003, base station #1 transmits instruction information #5 and instruction information #6 to terminal #3 and terminal #4, respectively.

Specifically, the instruction information #5 instructs the base station #1 to allocate the resource unit #1 to the terminal #3, and the instruction information #6 instructs the base station #1 to allocate the resource unit #4 to the terminal # 4.

Alternatively, the indication information #5 may further include information of the subcarrier mapping scheme of the resource unit #1, and the terminal #3 may determine the subcarrier mapping scheme of the resource unit #1 according to the information of the subcarrier mapping scheme of the resource unit # 1. The indication information #6 may further include information of the subcarrier mapping scheme of the resource unit #4, and the terminal #4 may determine the subcarrier mapping scheme of the resource unit #4 based on the information of the subcarrier mapping scheme of the resource unit # 4. Alternatively, base station #1 may also send another indication information to terminal #3, for example, written as: indication information #7, indication information #7 may be used to indicate the subcarrier mapping scheme of resource unit # 1. Base station #1 may also send another indication to terminal #4, for example, written as: indication information #8, indication information #8 may be used to indicate the subcarrier mapping scheme of resource unit # 4.

In S1004, terminal #3 specifies resource unit #1 based on instruction information #5, and terminal #4 specifies resource unit #4 based on instruction information # 6.

In S1005, terminal #3 specifies the subcarrier mapping scheme of resource unit #1, and terminal #4 specifies the subcarrier mapping scheme of resource unit # 4.

For example, the terminal #3 may determine the subcarrier mapping scheme of the resource unit #1 according to the subcarrier mapping scheme of the preset M resource units. The terminal #4 may determine the subcarrier mapping manner of the resource unit #4 according to the subcarrier mapping manner of the preset M resource units, and specifically refer to the description related to S220 above, which is not described herein again for brevity. For example, terminal #3 may determine the subcarrier mapping scheme of resource unit #1 from the information indicating the subcarrier mapping scheme of resource unit #1 in information #5 or from information indicating resource unit # 7. Terminal #4 can determine the subcarrier mapping scheme of resource unit #1 from the information indicating the subcarrier mapping scheme of resource unit #4 in information #6 or from information indicating information # 8.

S1006, terminal #3 and terminal #4 transmit signals to base station #1, respectively.

For example, terminal #3 and terminal #4 may process the information bits to be transmitted according to the signal processing flow shown in fig. 7 and the subcarrier mapping manners of resource unit #1 and resource unit #4, respectively, to obtain a radio frequency signal, and transmit the radio frequency signal.

Accordingly, after receiving the signals transmitted by terminal #3 and terminal #4, base station #1 may process the received signals in a unified manner according to the subcarrier mapping scheme of resource unit #1 and resource unit #4 according to the signal processing flow shown in fig. 8, for example, to obtain the information bits transmitted by terminal #3 and terminal # 4.

In the transmission method of the embodiment of the present application, the subcarriers of different terminals are all in the dedicated resource unit, and the base station can uniformly demodulate the uplink signals of the plurality of different terminals.

The scheme provided by the embodiment of the present application is mainly described above from the perspective of a method example, where the method example may be performed by a base station or a terminal, and may also be performed by a chip applied to the base station or a chip applied to the terminal. It is to be understood that the base station, the terminal, the chip applied to the base station or the chip applied to the terminal include corresponding hardware structures and/or software modules for performing the respective functions in order to implement the above-described functions. The elements and algorithm steps of the various examples described in connection with the embodiments disclosed herein may be embodied in hardware or in a combination of hardware and computer software. Whether a function is performed as hardware or computer software drives hardware depends upon the particular application and design constraints imposed on the solution. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present teachings.

In the embodiment of the present application, functional modules may be divided according to the above method examples, for example, each functional module may be divided according to each function, or two or more functions may be integrated into one processing module or unit. The integrated modules or units may be implemented in the form of hardware, or may be implemented in the form of software functional modules. It should be noted that, in the embodiment of the present application, the division of the module or the unit is schematic, and is only a logic function division, and there may be another division manner in actual implementation.

Fig. 11 is a schematic block diagram of a possible apparatus 1100 for data transmission according to an embodiment of the present application, where different functional modules or units are used. The apparatus 1100 may be a base station or a chip applied to a base station, or may be a terminal or a chip applied to a terminal. Where apparatus 1100 is a base station or a chip applied to a base station, apparatus 1100 can perform the various steps performed by the base station in the above-described method examples, e.g., apparatus 1100 can perform steps S210 and S220 in fig. 2, steps S601-S603 in fig. 6, steps S901-S903 in fig. 9, steps S1001-S1003 in fig. 10, and/or other steps performed by the base station as described herein. When the apparatus 1100 is a terminal or a chip applied to a terminal, the apparatus 1100 can perform the various steps performed by the terminal in the above-described method example, for example, the apparatus 1100 can perform steps S210 and S220 in fig. 2, steps S604 to S606 in fig. 6, steps S904 to S906 in fig. 9, steps S1004 to S1006 in fig. 10, and/or other steps performed by the terminal described herein.

For example, as shown in fig. 11, the apparatus 1100 includes: a determination unit 1110 and a communication unit 1120.

A determining unit 1110, configured to determine a subcarrier mapping manner of each of N resource units, where the N resource units belong to W resource units, the W resource units are consecutive in a frequency domain, subcarrier intervals of each of the W resource units are equal, subcarrier mapping manners of at least two of the W resource units are different, subcarriers in each resource unit are consecutive in the frequency domain, the subcarrier mapping manner of each resource unit is used to indicate a center frequency of each subcarrier of the resource units, a difference between center frequencies of any two subcarriers of the W resource units is an integer multiple of the subcarrier interval, bandwidths of the resource units are the same, and a bandwidth of each resource unit is a non-integer multiple of the subcarrier interval, where N is not less than 1 and not more than W, w is more than or equal to 2, and N and W are integers;

a communication unit 1120, configured to perform data transmission according to the subcarrier mapping manner of each resource unit in the N resource units.

In the case of an integrated unit, fig. 12 is a schematic block diagram of a possible apparatus 1200 for data transmission according to an embodiment of the present application. The apparatus 1200 may be a base station or a chip applied to a base station, or may be a terminal or a chip applied to a terminal. The apparatus 1200 includes: a processing unit 1210 and a communication unit 1220. The processing unit 1210 is configured to control and manage operations of the apparatus 1200. For example, when the apparatus 1200 is a base station or a chip applied to a base station, the processing unit 1210 is configured to enable the apparatus 1200 to perform step S210 in fig. 2, step S601 and step S602 in fig. 6, step S901 and step S902 in fig. 9, step S1001 and step S1002 in fig. 10, and/or other processing procedures described herein as being performed by the base station. For another example, when the apparatus 1200 is a terminal or a chip applied to a terminal, the processing unit 1210 is configured to enable the apparatus 1200 to perform step S210 in fig. 2, step S604 and step S605 in fig. 6, step S904 and step S905 in fig. 9, step S1004 and step S1005 in fig. 10, and/or other processing procedures described herein that are performed by the terminal. The communication unit 1220 is used to support communication between the apparatus 1200 and other devices. For example, when the apparatus 1200 is a base station or a chip applied to a base station, the communication unit 1220 is used to support the apparatus 1200 to perform step S220 in fig. 2, step S603 in fig. 6, step S903 in fig. 9, step S1003 in fig. 10, and/or other communication procedures described herein that are performed by a base station. For another example, when the apparatus 1200 is a terminal or a chip applied to a terminal, the communication unit 1220 is used to support the apparatus 1200 to perform step S220 in fig. 2, step S606 in fig. 6, step S906 in fig. 9, step S1006 in fig. 10, and/or other communication procedures described herein that are performed by a terminal. Further, the apparatus 1200 may also comprise a storage unit 1230 for storing program codes and data of the apparatus 1200.

The processing unit 1210 may be a processor or a controller, such as a Central Processing Unit (CPU), a general-purpose processor, a Digital Signal Processor (DSP), an application-specific integrated circuit (ASIC), a Field Programmable Gate Array (FPGA) or other programmable logic device, a transistor logic device, a hardware component, or any combination thereof. Which may implement or perform the various illustrative logical blocks, modules, and circuits described in connection with the disclosure. The processor may also be a combination of computing functions, e.g., comprising one or more microprocessors, DSPs, and microprocessors, among others. The communication unit 1220 may be a transceiver, a transceiving circuit, a communication interface, or the like. The storage unit 1230 may be a memory.

In the case that the apparatus 1200 is a base station, when the processing unit 1210 is a processor, the communication unit 1220 is a transmitter/receiver, and the storage unit 1230 is a memory, the apparatus for data transmission according to the embodiment of the present application may be the base station 1300 shown in fig. 13.

Fig. 13 shows a schematic diagram of a possible structure of a base station provided in an embodiment of the present application. Base station 1300 includes a processor 1302 and a transmitter/receiver 1301. The processor 1302 may be a controller, and is denoted as "controller/processor 1302" in fig. 13. The processor 1302 may perform various processes involved in a base station. The transmitter/receiver 1301 represents a device having a receiving and/or transmitting function for supporting radio communication between a base station and a terminal in the above-described embodiments. In the uplink, an uplink signal from the terminal is received via an antenna, demodulated by the receiver 1301 (e.g., a high frequency signal is demodulated to a baseband signal), and further processed by the processor 1302 to recover traffic data and signaling information transmitted by the terminal. On the downlink, traffic data and signaling messages are processed by processor 1302 and modulated (e.g., by modulating a baseband signal to a high frequency signal) by a transmitter 1301 to generate a downlink signal, which is transmitted via the antenna to the terminals. It is noted that the above demodulation or modulation functions can also be performed by the processor 1302. Further, the base station 1300 may also include a communication interface 1304, where the communication interface 1304 is used to support the base station in communicating with core network devices or other devices.

For example, the processor 1302 is further configured to perform the processes involved in the methods shown in fig. 2-10 and/or other processes of the technical solutions described in this application.

Further, the base station 1300 may further include a memory 1303, and the memory 1303 is used for storing program codes and data of the base station 1300.

It will be appreciated that fig. 13 only shows a simplified design of the base station 1300. In practical applications, the base station 1300 may include any number of transmitters, receivers, processors, controllers, memories, communication units, etc., and all base stations that can implement the embodiments of the present application are within the scope of the embodiments of the present application.

When the device 1200 is a terminal, when the processing unit 1210 is a processor, the communication unit 1220 is a transceiver, and the storage unit 1230 is a memory, the device for data transmission according to the embodiment of the present application may be the terminal shown in fig. 14.

Fig. 14 shows a simplified schematic diagram of one possible design structure of the terminal referred to in the embodiments of the present application. The terminal 1400 comprises a transmitter 1401, a receiver 1402 and a processor 1403. Wherein the processor 1403 can also be a controller, denoted as "controller/processor 1403" in fig. 14. Optionally, the terminal 1400 may further comprise a modem processor 1405, wherein the modem processor 1405 may comprise an encoder 1406, a modulator 1407, a decoder 1408, and a demodulator 1409.

In one example, transmitter 1401 conditions (e.g., converts to analog, filters, amplifies, and frequency upconverts, etc.) the output samples and generates an uplink signal, which is transmitted via an antenna to the base station as described in the embodiments above. On the downlink, the antenna receives the downlink signal transmitted by the base station in the above embodiment. Receiver 1402 conditions (e.g., filters, amplifies, downconverts, and digitizes, etc.) the received signal from the antenna and provides input samples. In modem processor 1405, an encoder 1406 receives traffic data and signaling messages to be transmitted on the uplink and processes (e.g., formats, encodes, and interleaves) the traffic data and signaling messages. A modulator 1407 further processes (e.g., symbol maps and modulates) the coded traffic data and signaling messages and provides output samples. A demodulator 1409 processes (e.g., demodulates) the input samples and provides symbol estimates. A decoder 1408 processes (e.g., deinterleaves and decodes) the symbol estimates and provides decoded data and signaling messages for transmission to terminal 1400. The encoder 1406, modulator 1407, demodulator 1409, and decoder 1408 may be implemented by a combined modem processor 1405. It is noted that when terminal 1400 does not include modem processor 1405, the above-described functionality of modem processor 1405 can also be performed by processor 1403.

Processor 1403 controls and manages the actions of terminal 1400 for performing the processing procedures performed by terminal 1400 in the embodiments of the present application described above. For example, the processor 1403 is further configured to perform the processing procedures related to the terminal in the methods shown in fig. 2 to 10 and/or other procedures of the technical solutions described in this application.

Further, terminal 1400 can also include a memory 1404, where memory 1404 can be used to store program codes and data for terminal 1400.

In the above embodiments, the implementation may be wholly or partially realized by software, hardware, firmware, or any combination thereof. When implemented in software, may be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer instructions. When loaded and executed on a computer, cause the processes or functions described in accordance with the embodiments of the application to occur, in whole or in part. The computer may be a general purpose computer, a special purpose computer, a network of computers, or other programmable device. The computer instructions may be stored in a computer readable storage medium or transmitted from one computer readable storage medium to another, for example, from one website site, computer, server, or data center to another website site, computer, server, or data center via wired (e.g., coaxial cable, fiber optic, Digital Subscriber Line (DSL)) or wireless (e.g., infrared, wireless, microwave, etc.). The computer-readable storage medium can be any available medium that can be accessed by a computer or a data storage device, such as a server, a data center, etc., that incorporates one or more of the available media. The usable medium may be a magnetic medium (e.g., floppy Disk, hard Disk, magnetic tape), an optical medium (e.g., DVD), or a semiconductor medium (e.g., Solid State Disk (SSD)), among others.

The various illustrative logical units and circuits described in this application may be implemented or operated upon by design of a general purpose processor, a digital signal processor, an Application Specific Integrated Circuit (ASIC), a Field Programmable Gate Array (FPGA) or other programmable logic device, discrete gate or transistor logic, discrete hardware components, or any combination thereof. A general-purpose processor may be a microprocessor, but in the alternative, the processor may be any conventional processor, controller, microcontroller, or state machine. A processor may also be implemented as a combination of computing devices, e.g., a digital signal processor and a microprocessor, a plurality of microprocessors, one or more microprocessors in conjunction with a digital signal processor core, or any other similar configuration.

The steps of a method or algorithm described in the embodiments herein may be embodied directly in hardware, in a software element executed by a processor, or in a combination of the two. The software cells may be stored in RAM memory, flash memory, ROM memory, EPROM memory, EEPROM memory, registers, hard disk, a removable disk, a CD-ROM, or any other form of storage medium known in the art. For example, a storage medium may be coupled to the processor such the processor can read information from, and write information to, the storage medium. In the alternative, the storage medium may be integral to the processor. The processor and the storage medium may reside in an ASIC, which may be located in a base station or a terminal. In the alternative, the processor and the storage medium may reside in different components in the base station or terminal.

These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.

Although the present application has been described in conjunction with specific features and embodiments thereof, it will be evident that various modifications and combinations can be made thereto without departing from the spirit and scope of the application. Accordingly, the specification and figures are merely exemplary of the present application as defined in the appended claims and are intended to cover any and all modifications, variations, combinations, or equivalents within the scope of the present application. It will be apparent to those skilled in the art that various changes and modifications may be made in the present application without departing from the spirit and scope of the application. Thus, if such modifications and variations of the present application fall within the scope of the claims of the present application and their equivalents, the present application is intended to include such modifications and variations as well.

Claims

1. A method of data transmission, comprising:

determining a subcarrier mapping mode of each resource unit of N resource units, wherein the N resource units belong to W resource units, the W resource units are continuous in a frequency domain, subcarrier intervals of each resource unit of the W resource units are equal, the subcarrier mapping modes of at least two resource units of the W resource units are different, subcarriers of each resource unit are continuous in the frequency domain, the subcarrier mapping mode of each resource unit is used for indicating the center frequency of each subcarrier of each resource unit, the difference of the center frequencies of any two subcarriers of the W resource units is an integral multiple of the subcarrier interval, the bandwidths of the resource units are the same, the bandwidth of each resource unit is a non-integral multiple of the subcarrier interval, N is not less than 1 and not more than W, and W is not less than 2, n and W are integers;

and carrying out data transmission according to the subcarrier mapping mode of each resource unit in the N resource units.

2. The method of claim 1, wherein the determining the subcarrier mapping scheme for each of the N resource units comprises:

determining a subcarrier mapping mode of each resource unit in the N resource units according to a subcarrier mapping mode of each resource unit in the M resource units and a position of each resource unit in the M resource units on a frequency domain, or according to a subcarrier mapping mode of each resource unit in the M resource units, a position of at least one resource unit in the M resource units on the frequency domain, a position of at least one resource unit in the M resource units and a bandwidth of each resource unit;

wherein M is a cycle period of the subcarrier mapping manner, the M resource units belong to the W resource units and are consecutive in a frequency domain, subcarrier mapping manners of at least two resource units of the M resource units are different, a total bandwidth of the M resource units is an integer multiple of the subcarrier spacing, M is greater than or equal to 2 and less than or equal to W, and M is an integer.

3. The method of claim 2, wherein the starting frequency of each of the M resource units increases sequentially in an order from a first resource unit to an mth resource unit;

wherein the determining the subcarrier mapping manner of each of the N resource units according to the preconfigured subcarrier mapping manner of each of the M resource units and the position of each of the M resource units on the frequency domain, or according to the preconfigured subcarrier mapping manner of each of the M resource units, the position of at least one of the M resource units on the frequency domain, the position of at least one of the M resource units on the M resource units, and the bandwidth of each resource unit, includes:

setting the starting frequency of the M resource units as f₀The subcarrier mapping mode of the resource unit is determined as that the starting frequency in the N resource units is f₁Or, the center frequency in the M resource units is f₀The subcarrier mapping mode of the resource unit is determined as that the center frequency in the N resource units is f₁The subcarrier mapping method of resource unit (c), wherein, | f₁-f₀| percent (M × B) ═ 0, | is absolute value operation,% is remainder operation,% is bandwidth of each resource unit, f₁>0，f₀>0，B>0; or,

determining the subcarrier mapping mode of the resource unit with the index of i in the M resource units as the subcarrier mapping mode of the resource unit with the index of j in the N resource units, wherein | j-i |% M is 0, | | is absolute value calculation,% is remainder calculation, i is more than or equal to 0, j is more than or equal to 0, and i and j are integers.

4. The method of claim 2 or 3, wherein each of the N resource units is a component carrier, and the number of subcarriers in each component carrier is the same.

5. The method of claim 4, wherein the number of subcarriers satisfies:

wherein,

indicating rounding-down, R is the number of the subcarriers, B is the bandwidth of each resource unit, C is the subcarrier spacing, A is a preset value, A is not less than 0, A is an integer, R is not less than 1, R is an integer, 0<C<B。

6. The method of claim 5, wherein if B/C is k1/k2, then M is k2, k1 and k2 are all integers.

7. The method of any of claims 1 to 3, wherein the bandwidth of each resource unit is 25kHz or 12.5kHz, and the subcarrier spacing is 1.875kHz, 3.75kHz or 2 kHz.

8. An apparatus for data transmission, comprising:

a determining unit, configured to determine a subcarrier mapping manner of each resource unit of N resource units, where the N resource units belong to W resource units, the W resource units are consecutive in a frequency domain, subcarrier intervals of each resource unit of the W resource units are equal, subcarrier mapping manners of at least two resource units of the W resource units are different, subcarriers of each resource unit are consecutive in the frequency domain, the subcarrier mapping manner of each resource unit is used to indicate a center frequency of each subcarrier of the resource units, a difference between center frequencies of any two subcarriers of the W resource units is an integer multiple of the subcarrier interval, bandwidths of the resource units are the same, and a bandwidth of each resource unit is a non-integer multiple of the subcarrier interval, where N is greater than or equal to 1 and less than or equal to W, w is more than or equal to 2, and N and W are integers;

and a communication unit, configured to perform data transmission according to the subcarrier mapping manner of each resource unit in the N resource units.

9. The apparatus of claim 8, wherein the determination unit is specifically configured to:

10. The apparatus of claim 9, wherein a starting frequency of each of the M resource units increases sequentially in an order from a first resource unit to an mth resource unit;

wherein the determining unit is specifically configured to:

starting frequency f in the M resource units₀The subcarrier mapping mode of the resource unit is determined as that the starting frequency in the N resource units is f₁The subcarrier mapping mode of the resource unit (2) is to set the center frequency of the M resource units as f₀The subcarrier mapping mode of the resource unit is determined as that the center frequency in the N resource units is f₁The sub-carrier mapping mode of resource unit, | f₁-f₀| percent (M × B) ═ 0, | is absolute value operation,% is remainder operation,% is bandwidth of each resource unit, f₁>0，f₀>0，B>0; or,

11. The apparatus of claim 9 or 10, wherein each of the N resource units is a component carrier, and a number of subcarriers in each component carrier is the same.

12. The apparatus of claim 11, wherein the number of subcarriers satisfies:

wherein,

13. The apparatus of claim 12, wherein if B/C is k1/k2, then M is k2, k1 and k2 are integers.

14. The apparatus of any one of claims 8 to 10, wherein the bandwidth of each resource unit is 25kHz or 12.5kHz, and the subcarrier spacing is 1.875kHz, 3.75kHz, or 2 kHz.

15. An arrangement according to any of claims 8 to 10, characterized in that the arrangement is applied to a terminal.

16. The apparatus according to any of claims 8 to 10, wherein the apparatus is applied to a base station.

17. A terminal, characterized in that it comprises the apparatus of claim 15.

18. A base station comprising the apparatus of claim 16.

19. A communication system comprising a terminal according to claim 17 and a base station according to claim 18.

20. A computer-readable storage medium comprising instructions which, when executed on a computer, cause the computer to perform the method of any one of claims 1 to 7.

21. A computer device comprising a computer program which, when run on the computer device, causes the computer to perform the method of any of claims 1 to 7.

22. An apparatus for data transmission, comprising: an input interface and/or an output interface, a processor and a memory,

wherein the processor is configured to control the input interface and/or the output interface to transceive signals, the memory is configured to store computer instructions, and the processor is configured to execute the computer instructions stored in the memory to cause the data transmission apparatus to perform the method according to any one of claims 1 to 7.