CN117713989A

CN117713989A - Communication method, device and equipment

Info

Publication number: CN117713989A
Application number: CN202211079976.3A
Authority: CN
Inventors: 邹通; 龚名新; 张旭
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2022-09-05
Filing date: 2022-09-05
Publication date: 2024-03-15
Also published as: WO2024051653A1

Abstract

The application provides a communication method, a device and equipment, wherein the method can determine a first coding modulation parameter according to a coding and modulation scheme, adjust the number of frequency domain expansion subcarriers or reserved subcarriers according to the first coding modulation parameter, and optimize the peak-to-average ratio (PAPR) performance of a transmitting waveform on the premise of ensuring the block error rate (BLER) performance of a system.

Description

Communication method, device and equipment

Technical Field

The present disclosure relates to the field of communications technologies, and in particular, to a communications method, apparatus, and device.

Background

In order to improve uplink coverage in the New Radio (NR) technique, an orthogonal frequency division multiplexing (discrete Fourier transform spread orthogonal frequency division multiplexing, DFT-S-OFDM) waveform using discrete fourier transform spread spectrum is supported. The DFT-S-OFDM waveform may effectively reduce the peak-to-average ratio (peak to average power ratio, PAPR) of the signal compared to an orthogonal frequency division multiplexing (orthogonal frequency division multiplexing, OFDM) waveform, thereby improving coverage.

To further improve coverage, techniques such as spectrum spreading (spectral extension), frequency Domain Spectrum Shaping (FDSS), reserved subcarriers, etc., may be employed to reduce the PAPR of DFT-S-OFDM. Although the FDSS/frequency domain spreading/reserving subcarrier technique can effectively reduce the PAPR, in comparison with the DFT-S-OFDM waveform without the FDSS/frequency domain spreading/reserving subcarrier technique, in order to achieve the same spectral efficiency as before the frequency domain spreading, the spectral efficiency needs to be increased after the frequency domain spreading (for example, the code rate needs to be increased and/or the modulation order needs to be increased after the frequency domain spreading), so that the block error rate (BLER) performance loss of the system is gradually increased, and the throughput in the uplink transmission process is reduced. Therefore, how to reduce the PAPR while ensuring the BLER performance of the system becomes a problem to be solved.

Disclosure of Invention

The application provides a communication method, a communication device and communication equipment, wherein the PAPR performance of a transmitting waveform can be optimized on the premise of ensuring the BLER performance of a system.

In a first aspect, the present application provides a first communication method, which may be performed by a terminal device or a network device. Taking the terminal equipment as an execution main body and taking the terminal equipment as a transmitting end of the coded modulation data as an example, the terminal equipment determines the number of first subcarriers according to the first coded modulation parameter and transmits a first signal on the second subcarriers. The first code modulation parameter is used for code modulation processing, the first subcarrier is a frequency domain expansion subcarrier or a reserved subcarrier, and the value of the number of the first subcarriers is related to the value of the first code modulation parameter; when the number of the first subcarriers is not 0, the second subcarriers include the frequency domain extended subcarriers and subcarriers before the frequency domain extension, or the second subcarriers include the reserved subcarriers and subcarriers before the reservation.

In this method, the number of first subcarriers may vary with the first code modulation parameter. For example, when the spectrum efficiency is smaller, the coding performance loss caused by the code rate improvement is smaller, and more frequency domain extension subcarriers or reserved subcarriers can be adopted for data transmission, so that a larger PAPR performance gain is obtained, that is, the PAPR performance of the transmitting waveform is optimized on the premise of ensuring the BLER performance of the system.

In a possible implementation, the first coded modulation parameter is a modulation and coding scheme MCS index, or a coding rate, or a modulation order. Wherein one MCS index corresponds to one coding rate and one modulation order.

In a possible implementation, the first code modulation parameter is determined according to downlink control information DCI for scheduling the current transmission.

In this method, when the terminal device needs to perform retransmission, since the first code modulation parameter may change during retransmission (for example, the MCS index may be reduced during retransmission), the first code modulation parameter is determined according to the DCI for scheduling the current transmission, so that the first code modulation parameter determined by the terminal device is more accurate.

In a possible implementation, the first code modulation parameter belongs to a first set of code modulation parameters;

at least two different code modulation parameters lambda are present in the first set of code modulation parameters ₁ And lambda (lambda) ₂ ，

λ ₁ Greater than lambda ₂ ，λ ₁ The corresponding first ratio is smaller than lambda ₂ A corresponding first ratio of the values of the first ratio,

the first ratio is a ratio of the number of frequency domain extended subcarriers to the number of subcarriers before the frequency domain extension, or the first ratio is a ratio of the number of reserved subcarriers to the number of subcarriers before the reservation.

In this method, as the MCS index/coding rate/modulation order increases, the loss of BLER performance is gradually increased due to the frequency domain expansion or reservation of subcarriers, and thus the first ratio needs to be reduced (for example, the first ratio may be referred to as a frequency domain expansion ratio or a subcarrier reservation ratio). And, in the method, it is assumed that at least two different code modulation parameters lambda exist in the first code modulation parameter set ₁ And lambda (lambda) ₂ For example, there may be only two different code modulation parameters, satisfying the condition lambda ₁ Greater than lambda ₂ ，λ ₁ The corresponding first ratio is smaller than lambda ₂ The corresponding first ratio value may be a fixed value, while the other first ratio values for the coded modulation parameters may be fixed values.

any two different code modulation parameters lambda in the first code modulation parameter set ₃ And lambda (lambda) ₄ ，

λ ₃ Greater than lambda ₄ ，λ ₃ The corresponding first ratio is less than or equal to lambda ₄ A corresponding first ratio of the values of the first ratio,

In the method, any two different code modulation parameters lambda in a first code modulation parameter set are defined ₃ And lambda (lambda) ₄ All satisfy lambda ₃ Greater than lambda ₄ ，λ ₃ The corresponding first ratio is less than or equal to lambda ₄ A corresponding first ratio. For example, when lambda ₃ Or lambda ₄ If λ is different values and belongs to different values ₃ Greater than lambda ₄ ，λ ₃ The corresponding first ratio is smaller than lambda ₄ A corresponding first ratio. Also for example, when lambda ₃ Or lambda ₄ Lambda is the value of different values and belongs to the same value interval ₃ The corresponding first ratio is equal to lambda ₄ A corresponding first ratio.

In a possible implementation manner, when the value of the first code modulation parameter is smaller than or equal to the first threshold value, the first ratio α corresponding to the value x of the first code modulation parameter satisfies:

α＝μ ₁ *x+μ ₂ ，

wherein mu ₁ Is a negative real number, mu ₂ Is a positive real number.

In one possible implementation manner, when the value of the first code modulation parameter is greater than the first threshold value, the first ratio α corresponding to the value x of the first code modulation parameter is the first value.

In the method, the relation between the value x of the first code modulation parameter and the first ratio alpha is defined through a functional relation. For example, the value x of the first code modulation parameter and the first ratio α are in a decreasing function relationship, and when the value x of the first code modulation parameter is greater than the first threshold, it indicates that the frequency domain expansion or the subcarrier reservation results in a great loss of PAPR performance, and then the frequency domain expansion or the subcarrier reservation technique is no longer used to reduce the PAPR (for example, the first ratio is set to 0).

In a possible implementation manner, the terminal device may further perform rounding processing on the number N of the first subcarriers, to obtain a rounded number N 'of the first subcarriers, where N' is an integer multiple of the positive integer a.

In one possible embodiment, the positive integer a is 1 or 12.

In the method, if the number of the first subcarriers determined according to the first code modulation parameter is not an integer, the number of the first subcarriers can be rounded, so that the number of the first subcarriers is the number of the resource blocks or the integer multiple of the number of the subcarriers in the resource blocks, which is beneficial to data transmission.

In a possible implementation manner, the terminal device performs code modulation processing on the data bits. The method specifically comprises the following steps: determining a coding rate according to a first ratio corresponding to the first coding modulation parameter or a first ratio corresponding to the first subcarrier after the number of the first subcarriers is rounded; coding the data bits according to the coding code rate to obtain coding code words; modulating the code word according to the modulation order corresponding to the MCS index to obtain a modulation symbol; carrying out discrete Fourier transform processing on the modulation symbol to obtain a frequency domain signal; and performing cyclic extension or subcarrier reservation processing on the frequency domain signal to obtain a first signal. The first ratio corresponding to the rounded number of the first subcarriers is the ratio of the rounded number of the frequency domain expansion subcarriers to the number of the subcarriers before the frequency domain expansion; or, the first ratio corresponding to the rounded number of the first subcarriers is the ratio of the rounded number of reserved subcarriers to the number of subcarriers before reservation.

In the method, the coding rate is determined according to a first ratio corresponding to the first coding modulation parameter or a first ratio corresponding to the first subcarrier after the number of the first subcarriers is rounded, and then the frequency domain expansion or reserved subcarrier technology influences the coding modulation process.

It should be noted that the method described in the first aspect may also be performed by a network device. In this case, the network device is a transmitting end of the coded modulation data, and the terminal device is a receiving end. Alternatively, when the network device performs the method described in the first aspect, the network device may directly obtain the MCS index, or the coding rate, or the modulation order, without determining according to the downlink control information DCI for scheduling the current transmission when determining the first coded modulation parameter.

In a second aspect, the present application provides a second communication method, which may be performed by a terminal device or a network device. Taking the network device as an execution body and the network device as a receiving end of the code modulation data as an example, the network device determines the number of the first subcarriers according to the first code modulation parameter and receives the first signal on the second subcarriers. The first code modulation parameter is used for code modulation processing, the first subcarrier is a frequency domain expansion subcarrier or a reserved subcarrier, and the value of the number of the first subcarriers is related to the value of the first code modulation parameter; when the number of the first subcarriers is not 0, the second subcarriers include frequency domain extended subcarriers and subcarriers before frequency domain extension, or the second subcarriers include reserved subcarriers and subcarriers before reservation.

In this method, as the MCS index/coding rate/modulation order increases, the loss of PAPR performance is gradually increased due to the frequency domain expansion or reservation of subcarriers, so that the first ratio needs to be reduced (for example, the first ratio may be referred to as a frequency domain expansion ratio or a subcarrier reservation ratio). And, in the method, it is assumed that at least two different code modulation parameters lambda exist in the first code modulation parameter set ₁ And lambda (lambda) ₂ For example, there may be only two different code modulation parameters, satisfying the condition lambda ₁ Greater than lambda ₂ ，λ ₁ The corresponding first ratio is smaller than lambda ₂ The corresponding first ratio value may be a fixed value, while the other first ratio values for the coded modulation parameters may be fixed values.

In the method, any one of a first set of code modulation parameters is definedMeaning two different coded modulation parameters lambda ₁ And lambda (lambda) ₂ All satisfy lambda ₃ Greater than lambda ₄ ，λ ₃ The corresponding first ratio is less than or equal to lambda ₄ A corresponding first ratio. For example, when lambda ₃ Or lambda ₄ If λ is different values and belongs to different values ₃ Greater than lambda ₄ Lambda is then ₃ The corresponding first ratio is smaller than lambda ₄ A corresponding first ratio. Also for example, when lambda ₃ Or lambda ₄ Lambda is the value of different values and belongs to the same value interval ₃ The corresponding first ratio is equal to lambda ₄ A corresponding first ratio.

α＝μ ₁ *x+μ ₂ ，

wherein mu ₁ Is a negative real number, mu ₂ Is a positive real number.

In a possible implementation manner, the network device may further perform rounding processing on the number N of the first subcarriers, to obtain a rounded number N 'of the first subcarriers, where N' is an integer multiple of the positive integer a.

In one possible embodiment, the positive integer a is 1 or 12.

In the method, if the number N of the first subcarriers determined according to the first code modulation parameter is not an integer, the number N of the first subcarriers may be rounded, so that the number of the first subcarriers is the number of the resource blocks or an integer multiple of the number of subcarriers in the resource blocks, which is beneficial to data transmission.

In one possible implementation manner, after the network device receives the first signal, the network device performs a demodulation and decoding process on the first signal. The method specifically comprises the following steps: performing de-cyclic expansion or sub-carrier reservation processing on the first signal to obtain a frequency domain signal; carrying out inverse discrete Fourier transform processing on the frequency domain signal to obtain a modulation symbol; demodulating the modulation signal according to the modulation order corresponding to the MCS index to obtain a code word; determining a coding rate according to a first ratio corresponding to the first coding modulation parameter or a first ratio corresponding to the first subcarrier after the number of the first subcarriers is rounded; and decoding the encoded code word according to the encoding code rate to obtain data bits. The first ratio corresponding to the rounded number of the first subcarriers is the ratio of the rounded number of the frequency domain expansion subcarriers to the number of the subcarriers before the frequency domain expansion; or, the first ratio corresponding to the rounded number of the first subcarriers is the ratio of the rounded number of reserved subcarriers to the number of subcarriers before reservation.

In the method, the coding rate is determined according to a first ratio corresponding to a first coding modulation parameter or a first ratio corresponding to a first subcarrier after the number of first subcarriers is rounded, and then the frequency domain expansion or reserved subcarrier technology influences the demodulation and decoding process.

It should be noted that the method described in the second aspect above may also be performed by the terminal device. In this case, the terminal device is a receiving end of the code modulation data, and the network device is a transmitting end. Alternatively, when the terminal device performs the method described in the second aspect, the terminal device may determine the first code modulation parameter according to downlink control information DCI for scheduling the current transmission.

In a third aspect, the present application provides a third communication method, which may be performed by a network device. The network device determines the number of the first subcarriers according to the first code modulation parameter, and sends indication information to the terminal device, wherein the indication information comprises the number of the first subcarriers or a first ratio. The first code modulation parameter is used for code modulation processing, the first subcarrier is a frequency domain expansion subcarrier or a reserved subcarrier, the value of the number of the first subcarrier is related to the value of a code modulation coefficient, and the first ratio is the ratio of the number of the frequency domain expansion subcarriers to the number of the subcarriers before the frequency domain expansion, or the first ratio is the ratio of the number of the reserved subcarriers to the number of the subcarriers before the reservation. The network device receives the first signal from the terminal device on the second subcarrier. When the number of the first subcarriers is not 0, the second subcarriers include frequency domain extended subcarriers and subcarriers before frequency domain extension, or the second subcarriers include reserved subcarriers and subcarriers before reservation.

The method can be applied to an uplink data transmission scene that the network equipment sends the indication information to the terminal equipment, and the terminal equipment sends the coded modulation data to the network equipment according to the indication information. In the transmission scenario, the network device may directly indicate the frequency domain expansion ratio or the subcarrier reservation ratio to the terminal device, so that the terminal device may directly perform code modulation processing on the data bits according to the frequency domain expansion ratio or the subcarrier reservation ratio to obtain the first signal. For example, when the spectrum efficiency is smaller, the coding performance loss caused by the code rate improvement is smaller, and more frequency domain extension subcarriers or reserved subcarriers can be adopted for coding modulation processing, so that a larger PAPR performance gain is obtained, that is, the PAPR performance of the transmitting waveform is optimized on the premise of ensuring the BLER performance of the system.

In a possible implementation, the first coded modulation parameter is a modulation and coding scheme MCS index, or a coding rate, or a modulation order, or a spectral efficiency. Wherein one MCS index corresponds to one coding rate and one modulation order.

In the method, any two different code modulation parameters lambda in a first code modulation parameter set are defined ₁ And lambda (lambda) ₂ All satisfy lambda ₃ Greater than lambda ₄ ，λ ₃ The corresponding first ratio is less than or equal to lambda ₄ A corresponding first ratio. For example, when lambda ₃ Or lambda ₄ If λ is different values and belongs to different values ₃ Greater than lambda ₄ ，λ ₃ The corresponding first ratio is smaller than lambda ₄ A corresponding first ratio. Also for example, when lambda ₃ Or lambda ₄ Lambda is the value of different values and belongs to the same value interval ₃ The corresponding first ratio is equal to lambda ₄ A corresponding first ratio.

α＝μ ₁ *x+μ ₂ ，

wherein mu ₁ Is a negative real number, mu ₂ Is a positive real number.

In one possible embodiment, the positive integer a is 1 or 12.

In a possible implementation manner, the indication information further includes a first ratio corresponding to the rounded number of the first subcarriers, where the first ratio corresponding to the rounded number of the first subcarriers is a ratio of the rounded number of the frequency domain expansion subcarriers to the number of subcarriers before the frequency domain expansion; or, the first ratio corresponding to the rounded number of the first subcarriers is the ratio of the rounded number of reserved subcarriers to the number of subcarriers before reservation.

In the method, if the number of the first subcarriers is rounded, the conversion of the rounded number of the frequency domain expansion subcarriers or the number of the reserved subcarriers will result in the change of the frequency domain expansion ratio or the reserved subcarrier ratio, that is, the first ratio is changed from the first ratio to the first ratio corresponding to the rounded number of the first subcarriers.

In one possible implementation, the network device performs a demodulation and decoding process on the received first signal. The method specifically comprises the following steps: performing de-cyclic expansion or sub-carrier reservation processing on the first signal to obtain a frequency domain signal; carrying out inverse discrete Fourier transform processing on the frequency domain signal to obtain a modulation symbol; demodulating the modulation signal according to the modulation order corresponding to the MCS index to obtain a code word; determining a coding rate according to a first ratio corresponding to the first coding modulation parameter or a first ratio corresponding to the first subcarrier after the number of the first subcarriers is rounded; and decoding the encoded code word according to the encoding code rate to obtain data bits. The first ratio corresponding to the rounded number of the first subcarriers is the ratio of the rounded number of the frequency domain expansion subcarriers to the number of the subcarriers before the frequency domain expansion; or, the first ratio corresponding to the rounded number of the first subcarriers is the ratio of the rounded number of reserved subcarriers to the number of subcarriers before reservation.

In a fourth aspect, the present application provides a fourth communication method, which may be performed by a terminal device. The terminal device receives indication information from the network device, the indication information comprising a number of first sub-carriers or a first ratio. The first subcarrier is a frequency domain expansion subcarrier or a reserved subcarrier, the number of the first subcarriers is determined according to a first code modulation coefficient, the value of the number of the first subcarriers is related to the value of the code modulation coefficient, and the first ratio is the ratio of the number of the frequency domain expansion subcarriers to the number of the subcarriers before the frequency domain expansion, or the first ratio is the ratio of the number of the reserved subcarriers to the number of the subcarriers before the reservation. And the terminal equipment sends a first signal to the network equipment on a second subcarrier, wherein when the number of the first subcarriers is not 0, the second subcarrier comprises the frequency domain expansion subcarrier and the subcarrier before the frequency domain expansion, or the second subcarrier comprises the reserved subcarrier and the subcarrier before the reservation.

The method can be applied to an uplink data transmission scene that the network equipment sends the indication information to the terminal equipment, and the terminal equipment sends the coded modulation data to the network equipment according to the indication information. In the transmission scene, the terminal equipment directly receives the indication information, so that the indicated frequency domain expansion ratio or subcarrier reservation ratio is obtained, and the terminal equipment directly carries out code modulation processing on data bits according to the frequency domain expansion ratio or subcarrier reservation ratio to obtain a first signal. For example, when the spectrum efficiency is smaller, the coding performance loss caused by the code rate improvement is smaller, and more frequency domain extension subcarriers or reserved subcarriers can be adopted for coding modulation processing, so that a larger PAPR performance gain is obtained, that is, the PAPR performance of the transmitting waveform is optimized on the premise of ensuring the BLER performance of the system.

In the method, any two different code modulation parameters lambda in a first code modulation parameter set are defined ₁ And lambda (lambda) ₂ All satisfy lambda ₃ Greater than lambda ₄ ，λ ₃ The corresponding first ratio is less than or equal to lambda ₄ A corresponding first ratio. For example, when lambda ₃ Or lambda ₄ If λ is different values and belongs to different values ₃ Greater than lambda ₄ Lambda is then ₃ The corresponding first ratio is smaller than lambda ₄ A corresponding first ratio. Also for example, when lambda ₃ Or lambda ₄ Lambda is the value of different values and belongs to the same value interval ₃ The corresponding first ratio is equal to lambda ₄ A corresponding first ratio.

α＝μ ₁ *x+μ ₂ ，

wherein mu ₁ Is a negative real number, mu ₂ Is a positive real number.

In one possible embodiment, the positive integer a is 1 or 12.

In a possible implementation manner, the terminal device determines the coding rate according to the first ratio or the first ratio corresponding to the rounded number of the first subcarriers; coding the data bits according to the coding code rate to obtain coding code words; modulating the code word according to the modulation order corresponding to the MCS index to obtain a modulation symbol; performing discrete Fourier transform processing on the modulation symbols to obtain frequency domain signals; and performing cyclic extension or subcarrier reservation processing on the frequency domain signal to obtain a first signal. The first ratio corresponding to the rounded number of the first subcarriers is the ratio of the rounded number of the frequency domain expansion subcarriers to the number of the subcarriers before the frequency domain expansion; or, the first ratio corresponding to the rounded number of the first subcarriers is the ratio of the rounded number of reserved subcarriers to the number of subcarriers before reservation.

In the method, the coding rate is determined according to the first ratio or the first ratio corresponding to the rounded number of the first subcarriers, and then the frequency domain expansion or reserved subcarrier technology influences the coding modulation process.

In a fifth aspect, the present application provides a communications apparatus, which may be a network device, an apparatus in a network device, or an apparatus that can be used in cooperation with a network device. In one design, the communication device may include modules that perform the method/operations/steps/actions as described in the first aspect to the third aspect and any possible implementation manner of the first aspect to the third aspect, where the modules may be hardware circuits, software, or a combination of hardware circuits and software implementation. In one design, the communication device may include a processing unit and a communication unit.

For a specific description of the method performed by the network device, reference may be made to the foregoing first to third aspects, and corresponding descriptions in any possible implementation manner of the first to third aspects, which are not repeated herein. It will be appreciated that the communication device may also achieve the effects as may be achieved in the first to third aspects.

In a sixth aspect, the present application provides a communication device, which may be a terminal device, a device in a terminal device, or a device that can be used in a matching manner with a terminal device. In one design, the communication device may include modules that perform the methods/operations/steps/actions as described in the first aspect, the second aspect, and the fourth aspect, and any possible implementation manners of the first aspect, the second aspect, and the fourth aspect, where the modules may be hardware circuits, software, or a combination of hardware circuits and software implementation. In one design, the communication device may include a processing unit and a communication unit.

For a specific description of the method/operation/step/action performed by the terminal device, reference may be made to the above first aspect, second aspect and fourth aspect, and corresponding descriptions in any possible implementation manners of the first aspect, second aspect and fourth aspect, which are not repeated herein. It will be appreciated that the communication device may also achieve the effects as may be achieved in the first, second and fourth aspects.

In a seventh aspect, the present application provides a communication device, which is composed of an input-output interface and a logic circuit, wherein the input-output interface is used for inputting or outputting data; the logic circuit processes the data according to the method as in the first to third aspects and any one of the possible implementation manners of the first to third aspects, and obtains the processed data.

In an eighth aspect, the present application provides a communication device, which is composed of an input-output interface and a logic circuit, wherein the input-output interface is used for inputting or outputting data; the logic circuit processes the data according to the method as in any one of the possible implementation manners of the first aspect, the second aspect and the fourth aspect, and obtains the processed data.

In a ninth aspect, the present application provides a network device, comprising: a processor coupled to a memory for storing instructions that, when executed by the processor, cause the network device to implement the method of the first to third aspects, or any one of the possible implementation manners of the first to third aspects, as described above.

In a tenth aspect, the present application provides a terminal device, including: a processor coupled to a memory for storing instructions that, when executed by the processor, cause the terminal device to implement the method of the first, second and fourth aspects, or any one of the possible implementation manners of the first, second and fourth aspects.

In an eleventh aspect, the present application provides a communication system including a transmitting end and a receiving end. Wherein the sending end is configured to implement the functions in the methods in the first aspect and the fourth aspect and any possible implementation manners of the first aspect and the fourth aspect. The receiving end is configured to implement the functions of the methods in the second aspect and the third aspect, and any possible implementation manners of the second aspect and the third aspect. Alternatively, the communication system may comprise the communication apparatus as described in the fifth and sixth aspects, or may comprise the communication apparatus as described in the seventh and eighth aspects, or may comprise the device as described in the ninth and tenth aspects.

In a twelfth aspect, there is also provided herein a computer readable storage medium having instructions stored thereon which, when run on a computer, cause the computer to perform the first to fourth aspects and the method of any one of the possible implementations of the first to fourth aspects.

In a thirteenth aspect, the present application provides a chip system, the chip system comprising a processor, and may further comprise a memory, for implementing the functions in the methods of the first to fourth aspects and any possible implementation manners of the first to fourth aspects. The chip system may be formed of a chip or may include a chip and other discrete devices.

In a fourteenth aspect, there is also provided a computer program product comprising instructions which, when run on a computer, cause the computer to perform the method of any one of the possible implementations of the first to fourth aspects.

Drawings

Fig. 1 is a schematic diagram of a communication system provided herein;

FIG. 2 is a schematic diagram of a frequency domain expansion;

FIG. 3 is a schematic diagram of frequency domain spectral shaping;

Fig. 4 is a schematic diagram of the effect of frequency domain spreading and FDSS on PAPR performance of a signal;

fig. 5 is a schematic diagram of the effect of frequency domain spreading and FDSS on the BLER performance of a signal under a time domain filter estimation;

fig. 6 is a schematic flow chart of a first communication method provided in the present application;

fig. 7 is a schematic flow chart of a second communication method provided in the present application;

fig. 8 is a flow chart of a third communication method provided in the present application;

fig. 9 is a flow chart of a fourth communication method provided in the present application;

FIG. 10 is a schematic diagram of a communication device provided herein;

fig. 11 is a schematic diagram of a communication device provided in the present application.

Detailed Description

In this application, "/" may indicate that the associated object is an "or" relationship, e.g., A/B may represent A or B; "and/or" may be used to describe that there are three relationships associated with an object, e.g., a and/or B, which may represent: there are three cases, a alone, a and B together, and B alone, wherein a, B may be singular or plural. For convenience in describing the technical solutions of the present application, in this application, the words "first", "second", etc. may be used to distinguish between technical features that are the same or similar in function. The terms "first," "second," and the like do not necessarily denote any order of quantity or order of execution, nor do the terms "first," "second," and the like. In this application, the terms "exemplary" or "such as" and the like are used to denote examples, illustrations, or descriptions, any embodiment or design described as "exemplary" or "such as" should not be construed as preferred or advantageous over other embodiments or designs. The use of the word "exemplary" or "such as" is intended to present the relevant concepts in a concrete fashion to facilitate understanding.

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

In order to solve the problem that the block error rate (BLER) performance loss of a system increases due to spectrum spreading (spectral extension) and reduces throughput in the uplink transmission process, the application provides a communication method, which can adjust the number of frequency domain spreading subcarriers or the number of reserved subcarriers according to coding and modulation schemes, so that the PAPR performance of a transmission waveform is higher on the premise of ensuring the BLER performance of the system.

1. Related concepts to which the present application relates:

1. communication system:

the communication method provided by the application can be applied to a communication system. For example, fig. 1 is a schematic diagram of a communication system provided in the present application, where the communication system includes a terminal device and a network device, and the network device may provide a communication service to the terminal device.

The communication systems mentioned in this application include, but are not limited to: three major application scenarios of narrowband internet of things (NB-IoT), global system for mobile communications (global system for mobile communications, GSM), enhanced data rates for GSM evolution (enhanced data rate for GSM evolution, EDGE), wideband code division multiple access (wideband code division multiple access, WCDMA), code division multiple access 2000 (code division multiple access, CDMA 2000), time division synchronous code division multiple access (time division-synchronization code division multiple access, TD-SCDMA), long term evolution (long term evolution, LTE) and 5G mobile communication systems enhance mobile broadband (enhanced mobility broad band, eMBB), ultra high reliability and low latency communication (ultra-reliable and low latency communications, URLLC) and enhanced machine-like communication (enhanced machine-type communication, eMTC) and future communication systems (e.g., 6G/7G, etc.).

The network device may be a device capable of communicating with the terminal device. The network device may be a base station, a relay station, or an access point. The base station may be a base transceiver station (base transc eiver station, BTS) in a global system for mobile communications (global system for mobile communication, GSM) or a code division multiple access (code division multiple access, CDMA) network, a 3G base station NodeB in a wideband code division multiple access (wideband code division multiple access, WC DMA) system, or evolutional NodeB (abbreviated eNB or eNodeB) in a long term evolution (long term evolution, LTE) system. The network device may also be a satellite in a satellite communication system. The network device may also be a wireless controller in the context of a cloud wireless access network (cloud radio access network, CRAN). The network device may also be a network device in a 5G network or a network device (e.g. a gmodeb) in a future evolved public land mobile network (public land mobile network, PLMN) network. The network device may also be a wearable device, an unmanned aerial vehicle, or a device in the internet of vehicles (e.g. internet of vehicles (vehicle to everything, V2X)), or a communication device in inter-device (D2D) communication, or a network device applied in future communication systems.

The terminal device may be a User Equipment (UE), an access terminal, a terminal unit, a terminal station, a mobile station, a remote terminal, a mobile device, a terminal, a wireless communication device, a terminal agent, a terminal apparatus, or the like. An access terminal may be a cellular telephone, a cordless telephone, a session initiation protocol (session initiation protocol, SIP) phone, a wireless local loop (wireless local loop, WLL) station, a personal digital assistant (personal digital assistant, PDA), a handheld device with wireless communication capabilities, a computing device or other processing device connected to a wireless modem, a wearable device, a drone, a V2X device, a D2D device, a terminal device in a 5G network, a terminal device in a future evolved PLMN network, or a terminal device in a future communication system, etc.

2. Peak-to-average power ratio (PAPR):

PAPR is defined as the ratio of the peak power to the average power of a signal. Because the dynamic range of the power amplifier is limited, the excessive PAPR can lead to the power amplification entering a nonlinear region, thereby leading to nonlinear distortion of signals, causing spectrum expansion and in-band signal distortion and reducing the system performance. In order to avoid the signal entering the nonlinear region, an operation of power backoff needs to be performed. The higher the PAPR, the higher the power that needs to be backed off, but the power back off may cause the coverage performance to be reduced, so reducing the PAPR is beneficial to improving the coverage performance. Among them, the PAPR of the DFT-S-OFDM signal can be reduced by means of spectrum spreading (spectral extension) and frequency-domain spectrum shaping (FDSS).

3. Discrete fourier transform spread orthogonal frequency division multiplexing (discrete fourier transform spread orthogonal frequency division multiplexing, DFT-S-OFDM) signal:

to improve uplink coverage in the New Radio (NR) technique, DFT-S-OFDM waveforms are supported. The DFT-S-OFDM waveform may effectively reduce the peak-to-average ratio (peak to average power ratio, PAPR) of the signal compared to an orthogonal frequency division multiplexing (orthogonal frequency division multiplexing, OFDM) waveform, thereby improving coverage. For example, one process of generating a DFT-S-OFDM signal may include the steps of encoding, modulation, discrete fourier transform (discrete Fourier transform, DFT), subcarrier mapping and inverse fast fourier transform (inverse fast Fourier transformation, IFFT), cyclic Prefix (CP), and digital-to-analog conversion. Taking a low-density parity check (low density parity check, LDPC) coding mode, a quadrature phase shift keying (quadrature phase shift keying, QPSK) modulation mode, and taking the number of subcarriers as M as an example, the process of generating the DFT-S-OFDM signal is described:

step1: subjecting K data bits { a (0), a (1), a (K-1) } to LDPC coding to obtain 2M code words { b (0), b (1),. B (2M-1) }, wherein the code rate is r=k/2M.

step2: subjecting 2M code words { b (0), b (1), b (2M-1) } to QPSK modulation to obtain M modulation symbols { s (0), s (1),. S (M-1) }, where the modulation order is Q _m ＝2。

step3: the M modulation symbols are subjected to DFT at M points to obtain a frequency domain signal { X (0), X (1),...

step4: the frequency domain signal is mapped onto M subcarriers and an IFFT of N points is performed to obtain the time domain signal { x (0), x (1),... The value of N is determined by the system bandwidth, and N is greater than M. Optionally, when there are multiple transmitting antennas, the frequency domain signal may be multiplied by a precoding matrix and then subcarrier mapped.

step5: and adding a cyclic prefix to the time domain signal, performing digital-to-analog conversion to obtain an analog signal, and transmitting the analog signal through an antenna.

4. Spread spectrum:

spectrum spreading, also known as frequency domain spreading, refers to cyclic spreading of a frequency domain signal. For example, in the original DFT-S-OFDM signal, the frequency domain signal occupies M subcarriers, and the frequency domain signal is { X (0), X (1),. The. The frequency domain signal is cyclically extended, for example, E elements are extended in total, wherein P elements are extended to the left (or referred to as forward) and E-P elements are extended to the right (or referred to as backward), resulting in a frequency domain extended signal { X (M-P), X (M-p+1),., X (M-1), X (0), X (1),., X (E-P-1) } containing q=m+e elements. And mapping the signal after the frequency domain expansion to M+E subcarriers and transmitting. That is, the frequency domain extended signal will occupy more subcarriers.

In order to describe the proportion of the number of frequency domain spread subcarriers, a definition of the frequency domain spread proportion is introduced. The frequency domain expansion ratio in the application comprises the following two definition modes:

α ₂ ＝1-α ₁ (2)

wherein alpha is ₁ And alpha ₂ All represent the frequency domain expansion ratio, M represents the number of subcarriers before the frequency domain expansion, Q represents the number of subcarriers after the frequency domain expansion, and Q-M represents the number of frequency domain expansion subcarriers. Equations (1) and (2) can each describe the proportion of the number of frequency domain extended subcarriers, and can be derived from equations (1) and (2): alpha ₁ The larger the number of frequency domain spread subcarriers is, the larger the number of frequency domain spread subcarriers is; alpha ₂ The larger the number of frequency domain spread subcarriers is, the smaller the number of frequency domain spread subcarriers is. Wherein alpha is ₁ =0 or α ₂ =1 means that no frequency domain spreading is performed.

For example, fig. 2 is a schematic diagram of a frequency domain expansion. Assuming that the number of subcarriers before the frequency domain expansion m=8 and the total expansion e=4 elements, the number of subcarriers after the frequency domain expansion q=m+e=12. Where p=2 elements are extended to the left (or forward), and E-p=2 elements are extended to the right (or backward). According to the formula (1), the frequency domain expansion ratio alpha can be calculated ₁ = (12-8)/8=50%. Assuming that signals before frequency domain expansion are represented by { X (0), X (1), X (2), X (3), X (4), X (5), X (6), X (7) }, signals after frequency domain expansion are represented by { X (6), X (7), X (0), X (1), X (2), X (3), X (4), X (5), X (6), X (7), X (0), X (1) }. The frequency domain spread signal is mapped onto 12 subcarriers and transmitted.

Optionally, the frequency domain expansion ratio in the present application further includes the following two definition manners:

δ ₂ ＝1-δ ₁ (4)

wherein delta ₁ And delta ₂ All represent the frequency domain expansion ratio, M represents the number of subcarriers before the frequency domain expansion, Q represents the number of subcarriers after the frequency domain expansion, and Q-M represents the number of frequency domain expansion subcarriers. Equations (3) and (4) can each describe the proportion of the number of frequency domain extended subcarriers, and can be derived from equations (3) and (4): delta ₁ The larger the number of frequency domain spread subcarriers is, the larger the number of frequency domain spread subcarriers is; delta ₂ The larger the number of frequency domain spread subcarriers is, the smaller the number of frequency domain spread subcarriers is. Wherein delta ₁ =0 or δ ₂ =1 means that no frequency domain spreading is performed. That is, when the frequency domain expansion ratio definition in the present application satisfies the formula (1) and the formula (3), the trend of variation thereof is similar; when the frequency domain expansion ratio definition in the present application satisfies the formula (2) and the formula (4), the trend thereof is similar. In the examples hereinafter alpha ₁ And alpha ₂ The description is given by way of example, and not limitation.

5. Frequency domain spectral shaping FDSS:

FDSS means windowing filtering of a frequency domain signal, which means bit-wise multiplying the frequency domain signal with filter coefficients. For example, fig. 3 is a schematic diagram of frequency domain spectral shaping. In the original DFT-S-OFDM signal, the frequency domain signal occupies M subcarriers, and is { X (0), X (1),...

The frequency domain spreading and the FDSS may be used alone or simultaneously. When the method is used simultaneously, the frequency domain signal is usually circularly expanded, and then the frequency domain signal is multiplied by the filter coefficient bit by bit. For example, assuming that the frequency domain signal is { X (0), X (1),. The term, X (M-1) }, performing a cyclic extension process on the frequency domain signal to obtain a frequency domain extended signal of { X (M-P), X (M-p+1),. X (M-1), X (0), X (1),. The term, X (E-P-1) }; and multiplying the frequency domain spread signal with a filter coefficient { W (0), W (1),. The number of times, W (M+E) } bit by bit to obtain a frequency domain spread and window filtered frequency domain signal, and mapping the frequency domain spread and window filtered frequency domain signal to M+E subcarriers and transmitting the frequency domain signal.

6. Relation between coding performance loss and code rate and modulation order:

fig. 4 is a schematic diagram of the effect of frequency domain spreading and FDSS on PAPR performance of a signal. Fig. 4 shows the PAPR performance comparison of DFT-S-OFDM waveforms using FDSS and/or frequency domain spreading under QPSK modulation with DFT-S-OFDM waveforms not using FDSS and frequency domain spreading. Where the abscissa is PAPR performance and the ordinate is the complementary cumulative distribution function (complementary cumulative distribution function, CCDF) value. As can be seen from a comparison of fig. 4, FDSS and frequency domain spreading can reduce the PAPR of the signal.

Although frequency domain spreading and FDSS can effectively reduce PAPR, as code rate increases, block error rate (BLER) performance loss increases gradually with the use of FDSS and/or frequency domain spreading DFT-S-OFDM waveforms compared to DFT-S-OFDM waveforms without FDSS and frequency domain spreading. For example, fig. 5 is a schematic diagram of the effect of frequency domain spreading and FDSS on the BLER performance of a signal under a time domain filter estimate. Figure 5 shows the BLER performance comparison of DFT-S-OFDM waveforms using FDSS and frequency domain spreading under QPSK modulation versus DFT-S-OFDM waveforms not using FDSS and frequency domain spreading when the channel estimation algorithm is time domain filtered estimation. Where the abscissa is the spectral efficiency and the ordinate is the SNR value required to reach bler=0.1. With increasing spectral efficiency, the BLER performance penalty is progressively greater with the use of FDSS and frequency-domain-spread DFT-S-OFDM waveforms under QPSK modulation compared to the use of non-FDSS and frequency-domain-spread DFT-S-OFDM waveforms, which reduces throughput during uplink transmission.

Therefore, when the PAPR is reduced by using the frequency domain spreading technique on the DFT-S-OFDM waveform, it is necessary to prevent the BLER performance of the system from being impaired as much as possible. For example, table 1 is a table of the relation between coding performance loss and code rate, modulation order, including code rate before frequency domain expansion, after frequency domain expansion (e.g. frequency domain expansion A spreading ratio of 0.25), a BLER performance difference under QPSK modulation, a BLER performance difference under 16QAM modulation. For example, table 1 shows that the fixed frequency domain spreading ratio is 0.25 (which may also be described as 25%) and the difference in BLER performance of the DFT-S-OFDM waveform after code rate boosting in a gaussian channel is compared to the DFT-S-OFDM waveform before code rate boosting at the same total transmit power and the same spectral efficiency. In order to ensure that the initial code rate is R under the same total transmitting power and the same frequency spectrum efficiency, m subcarriers are used for transmitting, and the signal power on each subcarrier is P; the code rate after the code rate improvement is R (1+alpha) ₁ ) Using m/(1+α) ₁ ) Sub-carrier transmission, the signal power on each sub-carrier being P (1 + alpha ₁ ). The SNR value required for the transmission scheme after the code rate boosting to reach bler=0.1 is assumed to be SNR ₁ The SNR value required for the transmission scheme before the rate boosting to reach bler=0.1 is SNR ₂ The BLER performance difference can be expressed as Δsnr _BLER＝0.1 ＝SNR ₁ -SNR ₂ . Wherein ΔSNR _BLER＝0.1 The larger the code rate is, the larger the coding performance loss caused by the code rate improvement is.

Table 1: relation table of coding performance loss and code rate and modulation order

As can be seen from table 1, as the code rate increases, the coding performance loss caused by the frequency domain expansion increases gradually; and the larger the modulation order is, the further the coding performance loss caused by the code rate improvement is increased. As the frequency domain expansion ratio increases, the code rate increases more, and thus the coding performance loss increases. However, as the frequency domain expansion ratio increases, the PAPR has a larger falling space. Therefore, when the spectrum efficiency is smaller, the coding performance loss caused by the code rate improvement is smaller, and a larger frequency domain expansion ratio can be adopted to obtain a larger PAPR performance gain. When the spectrum efficiency is centered, the loss degree of the coding performance is gradually increased along with the increase of the frequency domain expansion ratio, and the frequency domain expansion ratio needs to be dynamically selected. When the spectrum efficiency is high, coding performance loss due to frequency domain expansion is large, and the PAPR cannot be reduced using frequency domain expansion.

7. Reserved subcarrier technology:

in addition to reducing the PAPR by frequency domain spreading and FDSS techniques, the PAPR may also be reduced by reserved sub-carrier techniques. The reserved subcarrier technology refers to selecting reserved subcarriers (which may also be referred to as peak reduction (peak reduction tones, PRT) subcarriers) in the frequency domain in advance, and placing the frequency domain clipping signal C through the reserved subcarriers. Wherein the frequency domain clipping signal C is subjected to inverse discrete fourier transform (inverse discrete Fourier transformation, IDFT) to generate an inverse waveform in the time domain that eliminates the peaks of the original time domain waveform. For example, assume that the reserved sub-carriers have an index { i } ₀ ,i ₁ ,...,i _L-1 The data signal X and the frequency-domain clipping signal C occupy different frequency-domain resources, i.e. the data signal X takes on a value of 0 on the reserved sub-carriers (i.e. X _k ＝0,k∈{i ₀ ,i ₁ ,...,i _L-1 Frequency-domain clipping signal C takes a value other than 0 on reserved subcarriers only (i.e., C) _k ≠0,k∈{i ₀ ,i ₁ ,...,i _L-1 }). The final time domain signal generated based on the data signal X and the frequency domain clipping signal C may be expressed as y=x+c=q (x+c), X representing the time domain signal generated by the frequency domain data signal C, C representing the time domain clipping signal generated by the frequency domain clipping signal, Q representing the IDFT matrix. The time-domain clipping signal c is iteratively generated by using a gradient descent method, and specifically, the iteration can be performed by using the existing gradient descent method, and the iteration process is not limited in the application.

2. Communication method provided by the application

The device in the application can be divided into a transmitting end and a receiving end of the code modulation data, wherein the transmitting end can be network equipment or terminal equipment, and the receiving end corresponds to the terminal equipment or the network equipment. According to different devices of the transmitting end and the receiving end, the uplink transmission scene (the transmitting end is a terminal device, the receiving end is a network device) and the downlink transmission scene (the transmitting end is a network device, and the receiving end is a terminal device) can be divided. The following description is directed to corresponding methods in different transmission scenarios.

1. In a downlink transmission scenario in which a transmitting end is a network device and a receiving end is a terminal device, a communication method executed by the network device is as follows:

fig. 6 is a flow chart of a first communication method provided in the present application, including the following steps:

s101, determining the number N of the first subcarriers according to the first code modulation parameters.

Wherein the first code modulation parameter is used for code modulation processing, and refers to a type of parameter related to code modulation processing. In this embodiment, the first coded modulation parameter may be a modulation and coding scheme (modulation and coding scheme, MCS) index, or a coding rate, or a modulation order. For example, table 2 is a mapping relationship between MCS index and coding rate, modulation order and spectral efficiency.

Table 2: mapping relation between MCS index and coding rate, modulation order and frequency spectrum efficiency

As can be seen from the analysis in table 2, as the MCS index value increases gradually, the coding rate and the spectral efficiency also increase gradually, and the modulation order may be regarded as an upward trend. Also, as can be seen from table 2, one MCS index corresponds to one coding rate and one modulation order.

In the downlink transmission scenario, a first code modulation parameter is determined by a network device. For example, the network device may determine the MCS index based on the channel quality. Alternatively, when the network device determines the MCS index, the corresponding coding rate and modulation order may also be determined according to table 2.

The first subcarrier is a frequency domain expansion subcarrier or a reserved subcarrier. That is, when the network device adopts the frequency domain expansion technique, the first subcarrier is a frequency domain expansion subcarrier; when the network device adopts the reserved sub-carrier technology, the first sub-carrier is a reserved sub-carrier. Wherein the value of the number N of the first subcarriers is related to the value of the first code modulation parameter. For example, as the value of the first code modulation parameter gradually increases, the number N of the first subcarriers gradually decreases.

To facilitate description of the impact of the frequency domain spreading technique or the reserved sub-carrier technique on the coded modulation process (e.g., impact on the coding rate and/or modulation order), the present application introduces a first ratio. When the network equipment adopts a frequency domain expansion technology, the first ratio is the ratio of the number of frequency domain expansion subcarriers to the number of subcarriers before frequency domain expansion; when the network device adopts the reserved sub-carrier technology, the first ratio is the ratio of the number of reserved sub-carriers to the number of sub-carriers before reservation. For example, the first ratio may be α when the network device employs a frequency domain expansion technique as shown in equation (1) ₁ Representing the frequency domain expansion ratio, wherein M represents the number of subcarriers before frequency domain expansion, Q represents the number of subcarriers after frequency domain expansion, and Q-M represents the number of frequency domain expansion subcarriers; when the network device adopts the reserved sub-carrier technology, alpha ₁ And (3) representing a subcarrier reservation ratio, wherein M represents the number of subcarriers before reservation, Q represents the number of subcarriers after reservation, and Q-M represents the number of reserved subcarriers.

Wherein, the value of the first ratio is related to the value of the first code modulation parameter, including the following cases:

case one: the first code modulation parameter belongs to a first code modulation parameter set;

λ ₁ Greater than lambda ₂ ，λ ₁ The corresponding first ratio is smaller than lambda ₂ A corresponding first ratio.

For example, when the first ratio alpha ₁ Represents a frequency domain expansion ratio or a subcarrier reservation ratio and is defined asIn this case, as the MCS index/coding rate/modulation order increases, the loss of PAPR performance is gradually increased due to the frequency domain expansion or reserved sub-carriers, and thus the first ratio needs to be reduced. Then when there are at least two different code modulation parameters lambda in the first set of code modulation parameters ₁ And lambda (lambda) ₂ And lambda is ₁ Greater than lambda ₂ Lambda is at the time ₁ The corresponding first ratio is smaller than lambda ₂ A corresponding first ratio. In which case one can be that there are only two different code modulation parameters, satisfying the condition lambda ₁ Greater than lambda ₂ ，λ ₁ The corresponding first ratio is smaller than lambda ₂ The corresponding first ratio value may be a fixed value, while the other first ratio values for the coded modulation parameters may be fixed values.

And a second case: the first code modulation parameter belongs to a first code modulation parameter set;

for example, when the first ratio alpha ₁ Represents a frequency domain expansion ratio or a subcarrier reservation ratio and is defined asIn this case, as the MCS index/coding rate/modulation order increases, the loss of PAPR performance is gradually increased due to the frequency domain expansion or reserved sub-carriers, and thus the first ratio needs to be reduced. Unlike case one, case two defines any two different code modulation parameters λ in the first code modulation parameter set ₁ And lambda (lambda) ₂ All satisfy lambda ₃ Greater than lambda ₄ ，λ ₃ The corresponding first ratio is less than or equal to lambda ₄ A corresponding first ratio. For example, when lambda ₃ Or lambda ₄ When the values are different and belong to different value intervals, lambda is calculated as ₃ Greater than lambda ₄ Lambda is at the time ₃ Corresponding toThe first ratio is less than lambda ₄ A corresponding first ratio. Also for example, when lambda ₃ Or lambda ₄ Is of different values and belongs to the same value interval, lambda ₃ Greater than lambda ₄ ，λ ₃ The corresponding first ratio is equal to lambda ₄ A corresponding first ratio.

In the first and second cases, when the first coded modulation parameter is an MCS index, or a coding rate, or a modulation order, the relationship between the first coded modulation parameter and the first ratio is described by way of example.

1) When the first ratio alpha ₁ Represents a frequency domain expansion ratio or a subcarrier reservation ratio and is defined asIn this case, it is assumed that the value set of the first ratio is w= { α _{1_1} ,α _{1_2} ,α _{1_3} ,α _{1_4} And alpha _{1_1} >α _{1_2} >α _{1_3} >α _{1_4} The mapping relationship between the first ratio and the MCS index is shown in table 3. In table 3, if the higher layer parameter tp-pi2BPSK is configured, the modulation order q=1, otherwise q=2.

Table 3: mapping relation table between first ratio and MCS index

For example, let the value set of the first ratio be w= {0.375,0.333,0.25,0.16}, γ ₁ ＝0,γ ₂ ＝7,γ ₃ ＝8,γ ₄ ＝10，γ ₅ ＝11,γ ₆ ＝12,γ ₇ ＝13,γ ₈ =16. When I _MCS When=9, the first ratio α can be determined from table 3 ₁ =0.333, so that the definition of the first ratio can be based onAnd determining the number of first subcarriers n=q-m=0.333×m, which is the number of subcarriers M before the frequency domain spreading.

2) When the first ratio alpha ₁ Represents a frequency domain expansion ratio or a subcarrier reservation ratio and is defined asIn this case, it is assumed that the value set of the first ratio is w= { α _{1_1} ,α _{1_2} ,α _{1_3} ,α _{1_4} And alpha _{1_1} >α _{1_2} >α _{1_3} >α _{1_4} The mapping relationship between the first ratio and the coding rate is shown in table 4.

Table 4: mapping relation table between first ratio and coding rate

Coding rate R	First ratio alpha ₁
		R∈(η ₁ ,η ₂ ]	α _{1_1}
R∈(η ₂ ,η ₃ ]	α _{1_2}
		R∈(η ₃ ,η ₄ ]	α _{1_3}
R∈(η ₄ ,η ₅ ]	α _{1_4}
		R>η ₅	0

For example, let the value set of the first ratio be w= {0.375,0.333,0.25,0.16}, γ ₁ ＝0,γ ₂ ＝1/8,γ ₃ ＝1/6，γ ₄ ＝1/3,γ ₅ =1/2. When r=1/7, the first ratio α can be determined from table 4 ₁ =0.333, so that the definition of the first ratio can be based onAnd determining the number of first subcarriers n=q-m=0.333×m, which is the number of subcarriers M before the frequency domain spreading.

3) When the first ratio alpha ₁ Represents a frequency domain expansion ratio or a subcarrier reservation ratio and is defined asIn this case, it is assumed that the value set of the first ratio is w= { α _{1_1} ,α _{1_2} And alpha _{1_1} >α _{1_2} The mapping between the first ratio and the modulation order is shown in table 5.

Table 5: mapping relation table between first ratio and modulation order

Modulation order Q _m	First ratio alpha ₁
		Q _m ∈[ρ ₁ ,ρ ₂ ]	α _{1_1}
Q _m ∈(ρ ₂ ,ρ ₃ ]	α _{1_2}
		Q _m >ρ ₃	0

For example, assume that the value set of the first ratio is w= {0.25,0.16}, ρ ₁ ＝0,ρ ₂ ＝2,ρ ₃ =4, when Q _m When=2, the first ratio α can be determined from table 5 ₁ =0.25, so that the definition of the first ratio can be based on And determining the number of first subcarriers n=q-m=0.25×m, with the known number of subcarriers M before frequency domain spreading.

The examples 1) to 3) are only examples, and the present application is not limited thereto. Also, the definition of the first ratio may be expressed asThat is, the first ratio may also take the form of a percentage, which is not limited in this application.

And a third case: when the value of the first code modulation parameter is smaller than or equal to the first threshold value, a first ratio alpha corresponding to the value x of the first code modulation parameter ₁ The method meets the following conditions:

α ₁ ＝μ ₁ *x+μ ₂ (5)

wherein mu ₁ Is a negative real number, mu ₂ Is a positive real number.

Or when the value of the first code modulation parameter is larger than the first threshold value, the first ratio alpha corresponding to the value x of the first code modulation parameter ₁ Is a first value. The first value is 0 or a value approaching 0.

For example, when the first ratio alpha ₁ Representing frequency domain expansion ratio orThe subcarrier reservation ratio is defined asIn this case, as the MCS index/coding rate/modulation order increases, the loss of PAPR performance is gradually increased due to the frequency domain expansion or reserved sub-carriers, and thus the first ratio needs to be reduced. Unlike the first or second case, although the function mapping relationship is used to describe the relationship of the first code modulation parameter and the first ratio in the third case, the described trend of the relationship of the first code modulation parameter and the first ratio is similar. For example, according to equation (5), for any two different coded modulation parameters λ ₃ And lambda (lambda) ₄ When lambda is ₃ Greater than lambda ₄ Lambda is at the time ₃ The corresponding first ratio is less than or equal to lambda ₄ A corresponding first ratio.

In the third case, when the first coding modulation parameter is an MCS index or a coding rate, a relationship between the first coding modulation parameter and the first ratio is described by way of example.

1) When the first ratio alpha ₁ Represents a frequency domain expansion ratio or a subcarrier reservation ratio and is defined asWhen the MCS index I can be derived according to equation (5) _MCS With a first ratio alpha ₁ The mapping function between the two is shown in formula (6): />

Assume that the parameter in the mapping function takes a value of mu ₁ ＝-0.028,μ ₂ =0.585, γ=16, where γ in equation (6) represents the first threshold. When I _MCS When=9, the first ratio value α can be calculated and determined according to the formula (6) ₁ =0.333, so that the definition of the first ratio can be based onAnd determining the number of first subcarriers n=q-m=0.333×m, which is the number of subcarriers M before the frequency domain spreading.

2) When the first ratio alpha ₁ Represents a frequency domain expansion ratio or a subcarrier reservation ratio and is defined asIn this case, the coding rate R and the first ratio alpha can be derived according to the formula (5) ₁ The mapping function between the two is shown in formula (7):

assume that the parameter in the mapping function takes a value of mu ₁ ＝-0.54916,μ ₂ = 0.4332, η=1/2, wherein η in formula (7) represents the first threshold value. When r=1/6, the first ratio value α can be calculated and determined according to the formula (7) ₁ =0.342, so that it can be defined according to the first ratioAnd determining the number of first subcarriers n=q-m=0.342×m, which is the number of subcarriers M before the frequency domain spreading.

Optionally, in addition to the relationship between the first code modulation parameter and the first ratio described in the above cases one to three, the present application provides another first code modulation parameter to second ratio α ₂ Relationship between the second ratio alpha ₂ And a first ratio alpha ₁ Satisfy alpha ₂ ＝1-α ₁ . For example, the second ratio is shown in equation (2), the second ratio α ₂ The frequency domain expansion ratio or subcarrier reservation ratio can also be expressed and defined asWhen the network device adopts the frequency domain expansion technology, alpha ₂ Representing the frequency domain expansion ratio, M representing the number of subcarriers before the frequency domain expansion, Q representing the number of subcarriers after the frequency domain expansion, and Q-M representing the frequency domain expansionNumber of subcarriers; when the network device adopts the reserved sub-carrier technology, alpha ₂ And (3) representing a subcarrier reservation ratio, wherein M represents the number of subcarriers before reservation, Q represents the number of subcarriers after reservation, and Q-M represents the number of reserved subcarriers.

Wherein, the value of the second ratio is related to the value of the first code modulation parameter, including the following cases:

Case four: the first code modulation parameter belongs to a first code modulation parameter set;

λ ₁ Greater than lambda ₂ ，λ ₁ The corresponding second ratio is greater than lambda ₂ A corresponding second ratio.

For example, when the second ratio alpha ₂ Represents a frequency domain expansion ratio or a subcarrier reservation ratio and is defined asIn this case, as the MCS index/coding rate/modulation order increases, the loss of PAPR performance due to the frequency domain expansion or reserved sub-carriers gradually decreases, so that the second ratio can be increased. Then when there are at least two different code modulation parameters lambda in the first set of code modulation parameters ₁ And lambda (lambda) ₂ And lambda is ₁ Greater than lambda ₂ Lambda is at the time ₁ The corresponding second ratio is greater than lambda ₂ A corresponding second ratio. In the fourth case, only two different code modulation parameters exist, so that lambda is satisfied ₁ Greater than lambda ₂ ，λ ₁ The corresponding second ratio is greater than lambda ₂ The corresponding second ratio value may be a fixed value, while the corresponding second ratio value of the other code modulation parameters may be a fixed value. />

Case five: the first code modulation parameter belongs to a first code modulation parameter set;

λ ₃ Greater than lambda ₄ ，λ ₃ The corresponding second ratio is less than or equal to lambda ₄ A corresponding second ratio value of the first ratio value,

for example, when the second ratio alpha ₂ Represents a frequency domain expansion ratio or a subcarrier reservation ratio and is defined asIn this case, as the MCS index/coding rate/modulation order increases, the loss of PAPR performance due to the frequency domain expansion or reserved sub-carriers gradually decreases, so that the second ratio can be increased. Unlike case one, case two defines any two different code modulation parameters λ in the first code modulation parameter set ₁ And lambda (lambda) ₂ All satisfy lambda ₃ Greater than lambda ₄ ，λ ₃ The corresponding second ratio is greater than or equal to lambda ₄ A corresponding second ratio. For example, when lambda ₃ Or lambda ₄ When the values are different and belong to different value intervals, lambda is calculated as ₃ Greater than lambda ₄ Lambda is at the time ₃ The corresponding second ratio is greater than lambda ₄ A corresponding second ratio. Also for example, when lambda ₃ Or lambda ₄ Is of different values and belongs to the same value interval, lambda ₃ Greater than lambda ₄ ，λ ₃ The corresponding second ratio is equal to lambda ₄ A corresponding second ratio.

In the fourth and fifth cases, the relationship between the first coded modulation parameter and the second ratio is described by way of example when the first coded modulation parameter is an MCS index, or a coding rate, or a modulation order.

1) When the second ratio alpha ₂ Represents a frequency domain expansion ratio or a subcarrier reservation ratio and is defined asIn this case, it is assumed that the value set of the second ratio is w= { α _{2_1} ,α _{2_2} ,α _{2_3} ,α _{2_4} And alpha _{2_1} <α _{2_2} <α _{2_3} <α _{2_4} The mapping relationship between the second ratio and the MCS index is shown in table 6.

Table 6: mapping relation table between second ratio and MCS index

For example, let the value set of the second ratio be w= {0.625,0.667,0.75,0.84}, γ ₁ ＝0,γ ₂ ＝7,γ ₃ ＝8，γ ₄ ＝10,γ ₅ ＝11,γ ₆ ＝12,γ ₇ ＝13,γ ₈ =16. When I _MCS When=9, the second ratio α can be determined from table 6 ₂ =0.667, so that the definition of the second ratio can be based onAnd the number of subcarriers before frequency domain expansion M is known, and the number of first subcarriers n=q-m= (1-0.667) ×m=0.333×m is determined.

It can be seen that, since the first ratio and the second ratio satisfy a certain relationship and a change rule, the number of the determined first subcarriers is the same with the first ratio and the second ratio.

2) When the second ratio alpha ₂ Represents a frequency domain expansion ratio or a subcarrier reservation ratio and is defined asIn this case, it is assumed that the value set of the second ratio is w= { α _{2_1} ,α _{2_2} ,α _{2_3} ,α _{2_4} And alpha _{2_1} <α _{2_2} <α _{2_3} <α _{2_4} The mapping relationship between the second ratio and the coding rate is shown in table 7.

Table 7: mapping relation table between second ratio and coding rate

Coding rate R	Second ratio alpha ₂
		R∈(η ₁ ,η ₂ ]	α _{2_1}
R∈(η ₂ ,η ₃ ]	α _{2_2}
		R∈(η ₃ ,η ₄ ]	α _{2_3}
R∈(η ₄ ,η ₅ ]	α _{2_4}
		R>η ₅	1

For example, let the value set of the second ratio be w= {0.625,0.667,0.75,0.84}, γ ₁ ＝0,γ ₂ ＝1/8,γ ₃ ＝1/6，γ ₄ ＝1/3,γ ₅ =1/2. When r=1/7, the second ratio α can be determined from table 7 ₂ =0.667, so that the definition of the second ratio can be based onAnd the number of subcarriers before frequency domain expansion M is known, and the number of first subcarriers n=q-m= (1-0.667) ×m=0.333×m is determined.

3) When the second ratio alpha ₂ Representing the frequency domain expansion ratio or the subcarrier reservation ratio, andis defined asIn this case, it is assumed that the value set of the second ratio is w= { α _{2_1} ,α _{2_2} And alpha _{2_1} <α _{2_2} The mapping between the first ratio and the modulation order is shown in table 8.

Table 8: mapping relation table between second ratio and modulation order

For example, assume that the value set of the second ratio is w= {0.75,0.84}, ρ ₁ ＝0,ρ ₂ ＝2,ρ ₃ =4, when Q _m When=2, the second ratio α can be determined from table 8 ₂ =0.75, so that the definition of the second ratio can be based onAnd the number of subcarriers before frequency domain expansion M is known, and the number of first subcarriers n=q-m= (1-0.75) ×m=0.25×m is determined.

The examples 1) to 3) are only examples, and the present application is not limited thereto. And, the definition of the second ratio can also be expressed asThat is, the second ratio may also take the form of a percentage, which is not limited in this application.

Case six: when the value of the first code modulation parameter is smaller than or equal to the first threshold value, the value x of the first code modulation parameter corresponds to the second ratio alpha ₂ The method meets the following conditions:

α ₂ ＝μ ₃ *x+μ ₄ (8)

wherein the method comprises the steps of，μ ₃ Is a positive real number, mu ₄ Is a positive real number.

Or when the value of the first code modulation parameter is larger than the first threshold value, the value x of the first code modulation parameter corresponds to the second ratio alpha ₂ Is a second value. The second value is 1 or a value approaching 1.

For example, when the second ratio alpha ₂ Represents a frequency domain expansion ratio or a subcarrier reservation ratio and is defined asIn this case, as the MCS index/coding rate/modulation order increases, the loss of PAPR performance due to the frequency domain expansion or reserved sub-carriers gradually decreases, so that the second ratio can be increased. Unlike the fourth or fifth case, although the function mapping relationship is used to describe the relationship of the first code modulation parameter to the second ratio in the sixth case, the described trend of the relationship of the first code modulation parameter to the second ratio is similar. For example, according to equation (8), for any two different coded modulation parameters λ ₃ And lambda (lambda) ₄ When lambda is ₃ Greater than lambda ₄ Lambda is at the time ₃ The corresponding second ratio is greater than or equal to lambda ₄ A corresponding second ratio.

In the sixth scenario, when the first coding modulation parameter is the MCS index or the coding rate, the relationship between the first coding modulation parameter and the second ratio is described by way of example.

1) When the second ratio alpha ₂ Represents a frequency domain expansion ratio or a subcarrier reservation ratio and is defined asWhen the MCS index I can be derived according to equation (8) _MCS To a second ratio alpha ₂ The mapping function between them is shown in formula (9):

assume that the parameters in the mapping function are takenThe value is mu ₃ ＝0.028,μ ₄ =0.415, γ=16, where γ in formula (9) represents a first threshold value. When I _MCS When=9, the second ratio can be calculated and determined to be α according to the formula (9) ₂ =0.667, so that the definition of the second ratio can be based onAnd the number of subcarriers before frequency domain expansion M is known, and the number of first subcarriers n=q-m= (1-0.667) ×m=0.333×m is determined.

2) When the second ratio alpha ₂ Represents a frequency domain expansion ratio or a subcarrier reservation ratio and is defined asIn this case, the ratio of the code rate R to the second ratio alpha can be derived according to the formula (8) ₂ The mapping function between the two is shown in the formula (10):

assume that the parameter in the mapping function takes a value of mu ₃ ＝0.54916,μ ₄ = 0.5668, η=1/2, wherein η in formula (10) represents the first threshold value. When r=1/6, the second ratio can be calculated and determined to be α according to the formula (10) ₂ =0.658, so that the definition of the second ratio can be based onAnd the number of subcarriers before frequency domain expansion, M, is known, and the number of first subcarriers n=q-m= (1-0.658) ×m=0.342×m is determined.

Alternatively, according to the descriptions in the first to sixth cases, the number of the first subcarriers determined according to the first code modulation parameter may be an integer or may not be an integer. However, when the number of the first subcarriers is an integer during transmission in the actual network, if the number of the first subcarriers is not an integer, the number N of the first subcarriers needs to be rounded, so as to obtain the rounded number N ', N' of the first subcarriers, which is an integer multiple of a positive integer a, where the positive integer a is 1 or 12. Where positive integer a=1 indicates that the number N 'of rounded first subcarriers is an integer multiple of a single subcarrier, and positive integer a=12 indicates that the number N' of rounded first subcarriers is an integer multiple of the number of subcarriers (typically 12) included in one resource block.

S102, the first signal is sent on the second subcarrier.

When N is not 0, the second subcarrier includes a frequency domain extended subcarrier and a subcarrier before frequency domain extension, or the second subcarrier includes a reserved subcarrier and a subcarrier before reservation. That is, when the frequency domain spreading technique or the reserved sub-carrier technique is adopted, the number of second sub-carriers is equal to the sum of the number of frequency domain spreading sub-carriers and the number of sub-carriers before the frequency domain spreading, or the number of second sub-carriers is equal to the sum of the number of reserved sub-carriers and the number of sub-carriers before the reservation. Optionally, if the number of the first subcarriers is rounded, when N is not 0, the number of the second subcarriers is equal to a sum of the number of the rounded frequency domain extended subcarriers and the number of the subcarriers before the frequency domain extension, or the number of the second subcarriers is equal to a sum of the number of the rounded reserved subcarriers and the number of the subcarriers before the reservation. Alternatively, when N is equal to 0, which indicates that no frequency domain spreading or reserved subcarrier processing is performed, the second subcarrier, i.e., the number of subcarriers required for the frequency domain signal.

In an alternative embodiment, before transmitting the first signal, the first signal is generated by performing processing such as code modulation on the data bits, and includes the following steps:

and s11, determining the coding rate according to the first ratio corresponding to the first coding modulation parameter or the first ratio corresponding to the first subcarrier after the number rounding processing.

The first ratio corresponding to the rounded number of the first subcarriers is the ratio of the rounded number of the frequency domain expansion subcarriers to the number of the subcarriers before the frequency domain expansion; or, the first ratio corresponding to the rounded number of the first subcarriers is the rounded number of reserved subcarriers and the number of subcarriers before reservationRatio of the two. That is, the first ratio employed to determine the coding rate may be the first ratio α as described in cases one to six above ₁ Or the first ratio value corresponding to the number of the first subcarriers after the rounding processingAlternatively, the first ratio used to determine the coding rate may also be the second ratio α as described in cases one to six above ₂ Or the corresponding second ratio after the number of the first sub-carriers is rounded>

And s12, coding the data bits according to the coding rate to obtain coding code words.

And s13, modulating the code word according to the modulation order corresponding to the MCS index to obtain a modulation symbol.

And s14, performing discrete Fourier transform processing on the modulation symbol to obtain a frequency domain signal.

And s15, performing cyclic extension or subcarrier reservation processing on the frequency domain signal to obtain a first signal.

For example, the specific execution flow of steps s11 to s15 includes:

after frequency domain expansion or reserved subcarrier processing, the coding rate is changed into R' =r (1+α) ₁ ) Suppose Q _m * R' ×m data bits { a (0), a (1), a (Q _m * R' is M-1) is processed by LDPC coding to obtain Q _m * M encoded codewords { b (0), b (1),. A., b (Q) _m * M-1) }, Q _m * M encoded codewords { b (0), b (1),. B (Q) _m * M-1) is modulated to the order Q _m To obtain M modulation symbols { s (0), s (1),. The term, s (M-1) }, and subjecting the M modulation symbols to a DFT of M points to obtain a frequency domain signal { X (0), X (1),. The term, X (M-1) }. Wherein the number of first subcarriers n=α ₁ * M, when cyclic expansion is performed on the frequency domain signal, P elements are expanded leftwards (or called forwards), N-P elements are expanded rightwards (or called backwards), and the obtained signal containsFrequency domain spread signal of q=m+n elements { X (M-P), X (M-p+1),..x (M-1), X (0), X (1),., X (N-P-1) }. And mapping the signals after the frequency domain expansion to M+N subcarriers and transmitting the signals. Or, when the subcarrier reservation processing is performed on the frequency domain signal, reserving P elements to the left (or called forward), reserving N-P elements to the right (or called backward), and obtaining the frequency domain clipping signal on the reserved subcarrier by using a gradient descent algorithm to obtain { C (0), C (1),. The frequency domain clipping signal is C (N-1) }, so as to obtain the frequency domain signal { C (0), C (1),. The frequency domain signal is C (P-1), X (0), X (1),. The frequency domain signal is X (M-1), C (P), C (p+1),. The frequency domain clipping signal is C (N-1) }. Optionally, the frequency domain signal is mapped onto Q subcarriers and an E-point IFFT is performed to obtain a time domain signal { x (0), x (1),., x (E-1) }. When there are multiple transmitting antennas, the frequency domain signal may be multiplied by a precoding matrix and then subcarrier mapped. Digital-to-analog conversion is performed on time-domain signals { x (0), x (1), x (E-1) } with a Cyclic Prefix (CP) to obtain an analog signal (e.g., the first signal actually refers to the analog signal herein), and the first signal is transmitted through an antenna.

Alternatively, in the specific implementation procedure, the coding rate may be unchanged, that is, the coding rate is the code rate R determined according to table 2. The subsequent execution flows are similar, and will not be described here again.

Optionally, in the specific execution flow, after performing cyclic extension or subcarrier reservation processing on the frequency domain signal, windowing filtering processing may also be performed on the frequency domain signal, and the specific implementation manner may refer to the existing windowing filtering processing method, which is not limited in this application.

Alternatively, the description of the frequency domain expansion ratio in this section is given by α ₁ And alpha ₂ For example, the frequency domain expansion ratio may be delta ₁ And delta ₂ ，δ ₁ And delta ₂ The mapping relationships shown in tables 3 to 8 or the functional relationships shown in formulas (7) to (10) are also satisfied, and the specific embodiments may refer to corresponding descriptions, which are not repeated here.

2. In a downlink transmission scenario in which a transmitting end is a network device and a receiving end is a terminal device, a communication method executed by the terminal device includes:

fig. 7 is a flow chart of a second communication method provided in the present application, including the following steps:

s201, determining the number N of the first subcarriers according to the first code modulation parameter.

S202, receiving a first signal on a second subcarrier.

When the terminal device is a receiving end, the terminal device may also determine the number N of the first subcarriers according to the first code modulation parameter. Specific determining manners, for example, related descriptions of the first subcarriers, related descriptions of the first code modulation parameters, descriptions of how to determine the number N of the first subcarriers according to the first code modulation parameters, and related descriptions of the first ratio, the second ratio, etc. may refer to corresponding descriptions in section 1, and are not repeated herein. In this embodiment, in the downlink transmission scenario, the first code modulation parameter may be determined by the network device and sent to the terminal device. For example, the network device may determine an MCS index based on the channel quality and transmit the MCS index to the terminal device. Alternatively, according to table 2, when the terminal device determines the MCS index, a corresponding coding rate and modulation order may also be determined. Optionally, in the downlink transmission scenario, there may be a case where the terminal device performs retransmission. For example, when the terminal device fails to decode the error or the coded modulation data transmission, the terminal device needs to retransmit. Wherein the MCS index will change upon retransmission, thereby causing the first coded modulation parameter to change. In case of retransmission, the first code modulation parameter is determined from downlink control information (downlink control information, DCI) for scheduling the current transmission.

The description of the second subcarrier may refer to the corresponding description in section 1, which is not repeated here.

In an alternative embodiment, after receiving the first signal, the first signal may be subjected to a demodulation decoding process, including the following steps:

and s21, performing de-cyclic expansion or de-subcarrier reservation processing on the first signal to obtain a frequency domain signal.

S22, carrying out inverse discrete Fourier transform processing on the frequency domain signal to obtain a modulation symbol;

s23, demodulating the modulation signal according to the modulation order corresponding to the MCS index to obtain a code word;

s24, determining a coding rate according to a first ratio corresponding to the first coding modulation parameter or a first ratio corresponding to the first sub-carrier after the number rounding processing;

and s25, decoding the encoded code word according to the encoding code rate to obtain data bits.

The steps s21-s25 are inverse of the steps s11-s15 described in section 1, for example, the first signal is subjected to a cyclic expansion process to obtain a frequency domain signal, that is, the frequency domain signal { X (M-P), X (M-p+1), X (M-1), X (0), X (1), X (N-P-1) } is subjected to a cyclic expansion process to obtain a frequency domain signal { X (0), X (1), X (M-1) }. Then, the frequency domain signal { X (0), X (1),. And X (M-1) } is subjected to inverse discrete fourier transform processing to obtain M modulation symbols { s (0), s (1),. And s (M-1) }. According to the modulation order Q _m Demodulating M modulation symbols to obtain Q _m * M encoded codewords { b (0), b (1),. B (Q) _m * M-1) }. After frequency domain expansion or reserved subcarrier processing, determining the change of the coding rate to be R' =R (1+alpha) ₁ ) Q is paired according to the coding rate R _m * M encoded codewords { b (0), b (1),. B (Q) _m * M-1) } to obtain Q _m * R' ×m data bits { a (0), a (1), a (Q _m *R′*M-1)}。

The methods described in the above paragraphs 1 and 2 may be implemented by replacing the execution body. For example, in an uplink transmission scenario in which the transmitting end is a terminal device and the receiving end is a network device, the terminal device may perform a first communication method as described in section 1, and the network device may perform a second communication method as described in section 2.

3. In an uplink transmission scenario in which a transmitting end is a terminal device and a receiving end is a network device, a communication method executed by the network device is as follows:

fig. 8 is a flow chart of a third communication method provided in the present application, including the following steps:

s301, the network equipment determines the number N of the first subcarriers according to the first code modulation parameter.

S302, the network device sends indication information to the terminal device, where the indication information includes the number N of first subcarriers or a first ratio.

The description of the first subcarrier, the description of the first code modulation parameter, the description of how to determine the number N of the first subcarriers according to the first code modulation parameter, and the description of the first ratio, the second ratio, etc. may refer to the corresponding description in section 1, and are not repeated herein.

Optionally, in this embodiment, the first coded modulation factor further comprises a spectral efficiency (the spectral efficiency is typically determined by the base station, and the terminal device is not involved). Wherein when the first code modulation parameter is the spectral efficiency, the spectral efficiency and the first ratio alpha ₁ The relation between them also satisfies the cases one to three described in section 1 and the related examples, or, the spectral efficiency and the second ratio α ₂ The relationships between them also satisfy the cases four to six described in section 1 and related examples, and are not described here again.

In this uplink transmission scenario, after determining the number N of first subcarriers, the network device may indicate the number N of first subcarriers or the first ratio to the terminal device through an indication information, and the terminal device may directly receive the indication information and generate and send a first signal according to the indication information (i.e., the terminal device does not need to determine the number N of first subcarriers or the first ratio by itself).

In an alternative embodiment, the indication information may be used to indicate the number N of different first subcarriers or the first ratio α by updating an increment bit field in the DCI, where different values of the information bits in the increment bit field ₁ . For example, table 9 provides a mapping relationship between a first ratio and quantization bit fields。

Table 9: mapping relation table between first ratio and quantization bit field

First ratio alpha ₁	Quantization bit field
		α _{1_1}	00
α _{1_2}	01
		α _{1_3}	10
α _{1_4}	11

For example, when the value of the quantized bit field is 00, the first ratio indicated by the indication information is alpha _{1_1} . The above table 9 is only an example, and for example, the quantization bit field may further indicate a different first ratio by using more bit values, which is not limited in this application.

S303, the network device receives the first signal on the second subcarrier.

The network device is a receiving end, and may receive the first signal on the second subcarrier, and the description of the second subcarrier may refer to the corresponding description in section 1, which is not repeated herein.

After the network device receives the first signal, the first signal may be subjected to demodulation and decoding processing, and the specific implementation method may refer to description of the demodulation and decoding processing of the first signal in section 2, which is not described herein again.

4. In an uplink transmission scenario in which a transmitting end is a terminal device and a receiving end is a network device, a communication method executed by the terminal device is as follows:

fig. 9 is a flow chart of a fourth communication method provided in the present application, including the following steps:

the terminal device receives 401 indication information from the network device, the indication information comprising the number N of first sub-carriers or a first ratio.

The description of the first subcarrier, the description of the first ratio, the second ratio, etc. may refer to the corresponding description in section 1, and the description of the indication information may refer to the corresponding description in section 3, which are not repeated herein.

The terminal device sends 402 a first signal to the network device on a second subcarrier.

The description of the second subcarrier may refer to the corresponding description in section 1, and will not be repeated here.

In an optional embodiment, before the terminal device sends the first signal, the terminal device performs processes such as code modulation on the data bits to generate the first signal, and in a specific embodiment, reference may be made to the corresponding description in section 1, which is not repeated herein.

To implement the functions of the methods provided herein, the devices or apparatuses provided herein may include hardware structures and/or software modules, where the functions are implemented in hardware structures, software modules, or both. Some of the functions described above are performed in a hardware configuration, a software module, or a combination of hardware and software modules, depending on the specific application of the solution and design constraints. The division of the modules in the present application is illustrative, and is merely a logic function division, and there may be another division manner in actual implementation. In addition, each functional module in the embodiments of the present application may be integrated in one processor, or may exist alone physically, or two or more modules may be integrated in one module. The integrated modules may be implemented in hardware or in software functional modules.

Fig. 10 is a schematic diagram of a communication device provided in the present application. The communication device may include modules that perform the methods/operations/steps/actions described in the corresponding method embodiments of fig. 6-9, where the modules may be hardware circuits, software, or a combination of hardware circuits and software.

The communication device 1000 includes a communication unit 1001 and a processing unit 1002. For implementing the method performed by the terminal device or the network device in the foregoing embodiments.

In a possible implementation manner, the processing unit 1002 is configured to determine the number of first subcarriers according to the first code modulation parameter. The first code modulation parameter is used for code modulation processing, the first subcarrier is a frequency domain expansion subcarrier or a reserved subcarrier, and the value of the number of the first subcarriers is related to the value of the first code modulation parameter. The communication unit 1001 is configured to transmit a first signal on a second subcarrier. When the number of the first subcarriers is not 0, the second subcarriers comprise frequency domain expansion subcarriers and subcarriers before frequency domain expansion, or the second subcarriers comprise reserved subcarriers and subcarriers before reservation.

Optionally, the first coded modulation parameter is a modulation and coding scheme MCS index, or a coding rate, or a modulation order. Wherein one MCS index corresponds to one coding rate and one modulation order.

Optionally, the first code modulation parameter is determined according to downlink control information DCI for scheduling the current transmission.

Optionally, the first coded modulation parameter belongs to a first set of coded modulation parameters;

λ ₁ Greater than lambda ₂ ，λ ₁ The corresponding first ratio is smaller than lambda ₂ Corresponding first ratio，

Optionally, when the value of the first code modulation parameter is smaller than or equal to the first threshold, the first ratio α corresponding to the value x of the first code modulation parameter satisfies:

α＝μ ₁ *x+μ ₂ ，

wherein mu ₁ Is a negative real number, mu ₂ Is a positive real number.

Optionally, when the value of the first code modulation parameter is greater than the first threshold, the first ratio α corresponding to the value x of the first code modulation parameter is the first value.

Optionally, the processing unit 1002 is configured to perform rounding processing on the number N of the first subcarriers, so as to obtain a rounded number N ', N' of the first subcarriers, which is an integer multiple of the positive integer a.

Alternatively, the positive integer a is 1 or 12.

Optionally, the processing unit 1002 is configured to perform a code modulation process on the data bits. The method specifically comprises the following steps: determining a coding rate according to a first ratio corresponding to the first coding modulation parameter or a first ratio corresponding to the first subcarrier after the number of the first subcarriers is rounded; coding the data bits according to the coding code rate to obtain coding code words; modulating the code word according to the modulation order corresponding to the MCS index to obtain a modulation symbol; carrying out discrete Fourier transform processing on the modulation symbol to obtain a frequency domain signal; and performing cyclic extension or subcarrier reservation processing on the frequency domain signal to obtain a first signal. The first ratio corresponding to the rounded number of the first subcarriers is the ratio of the rounded number of the frequency domain expansion subcarriers to the number of the subcarriers before the frequency domain expansion; or, the first ratio corresponding to the rounded number of the first subcarriers is the ratio of the rounded number of reserved subcarriers to the number of subcarriers before reservation.

The specific execution flow of the communication unit 1001 and the processing unit 1002 in this embodiment may also refer to descriptions in the method embodiments corresponding to fig. 6 to 9, which are not repeated here. The communication method implemented by the communication device designs that the number of the first sub-carriers can be changed according to different first code modulation parameters. For example, when the spectrum efficiency is smaller, the coding performance loss caused by the code rate improvement is smaller, and more frequency domain extension subcarriers or reserved subcarriers can be adopted for data transmission, so that a larger PAPR performance gain is obtained, that is, the PAPR performance of the transmitting waveform is optimized on the premise of ensuring the BLER performance of the system.

In another possible implementation manner, the processing unit 1002 is configured to determine the number of first subcarriers according to the first code modulation parameter. The first code modulation parameter is used for code modulation processing, the first subcarrier is a frequency domain expansion subcarrier or a reserved subcarrier, and the value of the number of the first subcarriers is related to the value of the first code modulation parameter. The communication unit 1001 is configured to receive a first signal on a second subcarrier. When the number of the first subcarriers is not 0, the second subcarriers include frequency domain extended subcarriers and subcarriers before frequency domain extension, or the second subcarriers include reserved subcarriers and subcarriers before reservation.

α＝μ ₁ *x+μ ₂ ，

Wherein mu ₁ Is a negative real number, mu ₂ Is a positive real number.

Alternatively, the positive integer a is 1 or 12.

Optionally, the processing unit 1002 is configured to perform demodulation decoding processing on the first signal after receiving the first signal. The method specifically comprises the following steps: performing de-cyclic expansion or sub-carrier reservation processing on the first signal to obtain a frequency domain signal; carrying out inverse discrete Fourier transform processing on the frequency domain signal to obtain a modulation symbol; demodulating the modulation signal according to the modulation order corresponding to the MCS index to obtain a code word; determining a coding rate according to a first ratio corresponding to the first coding modulation parameter or a first ratio corresponding to the first subcarrier after the number of the first subcarriers is rounded; and decoding the encoded code word according to the encoding code rate to obtain data bits. The first ratio corresponding to the rounded number of the first subcarriers is the ratio of the rounded number of the frequency domain expansion subcarriers to the number of the subcarriers before the frequency domain expansion; or, the first ratio corresponding to the rounded number of the first subcarriers is the ratio of the rounded number of reserved subcarriers to the number of subcarriers before reservation.

The specific execution flow of the communication unit 1001 and the processing unit 1002 in this embodiment may also refer to descriptions in the method embodiments corresponding to fig. 6 to 9, which are not repeated here. The number of first subcarriers in the communication method implemented by the communication device may vary with the first code modulation parameter. For example, when the spectrum efficiency is smaller, the coding performance loss caused by the code rate improvement is smaller, and more frequency domain extension subcarriers or reserved subcarriers can be adopted for data transmission, so that a larger PAPR performance gain is obtained, that is, the PAPR performance of the transmitting waveform is optimized on the premise of ensuring the BLER performance of the system.

In another possible implementation, the processing unit 1002 is configured to determine the number of first subcarriers according to the first coded modulation factor. The communication unit 1001 is configured to send indication information to a terminal device, where the indication information includes the number N of first subcarriers or a first ratio. The first code modulation parameter is used for code modulation processing, the first subcarrier is a frequency domain expansion subcarrier or a reserved subcarrier, the value of the number of the first subcarrier is related to the value of a code modulation coefficient, and the first ratio is the ratio of the number of the frequency domain expansion subcarriers to the number of the subcarriers before the frequency domain expansion, or the first ratio is the ratio of the number of the reserved subcarriers to the number of the subcarriers before the reservation. The communication unit 1001 is further configured to receive a first signal from a terminal device on a second subcarrier. When the number of the first subcarriers is not 0, the second subcarriers include frequency domain extended subcarriers and subcarriers before frequency domain extension, or the second subcarriers include reserved subcarriers and subcarriers before reservation.

Optionally, the first coded modulation parameter is a modulation and coding scheme MCS index, or a coding rate, or a modulation order, or a spectral efficiency. Wherein one MCS index corresponds to one coding rate and one modulation order.

α＝μ ₁ *x+μ ₂ ，

wherein mu ₁ Is a negative real number, mu ₂ Is a positive real number.

Alternatively, the positive integer a is 1 or 12.

Optionally, the indication information further includes a first ratio corresponding to the rounded number of the first subcarriers, where the first ratio corresponding to the rounded number of the first subcarriers is a ratio of the rounded number of the frequency domain expansion subcarriers to the number of subcarriers before the frequency domain expansion; or, the first ratio corresponding to the rounded number of the first subcarriers is the ratio of the rounded number of reserved subcarriers to the number of subcarriers before reservation.

Optionally, the processing unit 1002 is configured to perform demodulation decoding processing on the received first signal. The method specifically comprises the following steps: performing de-cyclic expansion or sub-carrier reservation processing on the first signal to obtain a frequency domain signal; carrying out inverse discrete Fourier transform processing on the frequency domain signal to obtain a modulation symbol; demodulating the modulation signal according to the modulation order corresponding to the MCS index to obtain a code word; determining a coding rate according to a first ratio corresponding to the first coding modulation parameter or a first ratio corresponding to the first subcarrier after the number of the first subcarriers is rounded; and decoding the encoded code word according to the encoding code rate to obtain data bits. The first ratio corresponding to the rounded number of the first subcarriers is the ratio of the rounded number of the frequency domain expansion subcarriers to the number of the subcarriers before the frequency domain expansion; or, the first ratio corresponding to the rounded number of the first subcarriers is the ratio of the rounded number of reserved subcarriers to the number of subcarriers before reservation.

The specific execution flow of the communication unit 1001 and the processing unit 1002 in this embodiment may also refer to descriptions in the method embodiments corresponding to fig. 6 to 9, which are not repeated here. The communication method realized by the communication device can be applied to an uplink data transmission scene that the network equipment sends the indication information to the terminal equipment, and the terminal equipment sends the coded modulation data to the network equipment according to the indication information. In the transmission scenario, the network device may directly indicate the frequency domain expansion ratio or the subcarrier reservation ratio to the terminal device, so that the terminal device may directly perform code modulation processing on the data bits according to the frequency domain expansion ratio or the subcarrier reservation ratio to obtain the first signal. For example, when the spectrum efficiency is smaller, the coding performance loss caused by the code rate improvement is smaller, and more frequency domain extension subcarriers or reserved subcarriers can be adopted for coding modulation processing, so that a larger PAPR performance gain is obtained, that is, the PAPR performance of the transmitting waveform is optimized on the premise of ensuring the BLER performance of the system.

In another possible implementation, the communication unit 1001 is configured to receive indication information from a network device, where the indication information includes a number of first subcarriers or a first ratio. The first subcarrier is a frequency domain expansion subcarrier or a reserved subcarrier, the number of the first subcarriers is determined according to a first code modulation coefficient, the value of the number of the first subcarriers is related to the value of the code modulation coefficient, and the first ratio is the ratio of the number of the frequency domain expansion subcarriers to the number of the subcarriers before the frequency domain expansion, or the first ratio is the ratio of the number of the reserved subcarriers to the number of the subcarriers before the reservation. The communication unit 1001 is further configured to send the first signal to the network device on the second subcarrier. When the number of the first subcarriers is not 0, the second subcarriers comprise the frequency domain expansion subcarriers and the subcarriers before the frequency domain expansion, or the second subcarriers comprise the reserved subcarriers and the subcarriers before the reservation.

α＝μ ₁ *x+μ ₂ ，

wherein mu ₁ Is a negative real number, mu ₂ Is a positive real number.

Alternatively, the positive integer a is 1 or 12.

Optionally, the processing unit 1002 is configured to determine the coding rate according to the first ratio or the first ratio corresponding to the rounded number of the first subcarriers; coding the data bits according to the coding code rate to obtain coding code words; modulating the code word according to the modulation order corresponding to the MCS index to obtain a modulation symbol; performing discrete Fourier transform processing on the modulation symbols to obtain frequency domain signals; and performing cyclic extension or subcarrier reservation processing on the frequency domain signal to obtain a first signal. The first ratio corresponding to the rounded number of the first subcarriers is the ratio of the rounded number of the frequency domain expansion subcarriers to the number of the subcarriers before the frequency domain expansion; or, the first ratio corresponding to the rounded number of the first subcarriers is the ratio of the rounded number of reserved subcarriers to the number of subcarriers before reservation.

The specific execution flow of the communication unit 1001 and the processing unit 1002 in this embodiment may also refer to descriptions in the method embodiments corresponding to fig. 6 to 9, which are not repeated here. The communication method realized by the communication device can be applied to an uplink data transmission scene that the network equipment sends the indication information to the terminal equipment, and the terminal equipment sends the coded modulation data to the network equipment according to the indication information. In the transmission scene, the terminal equipment directly receives the indication information, so that the indicated frequency domain expansion ratio or subcarrier reservation ratio is obtained, and the terminal equipment directly carries out code modulation processing on data bits according to the frequency domain expansion ratio or subcarrier reservation ratio to obtain a first signal. For example, when the spectrum efficiency is smaller, the coding performance loss caused by the code rate improvement is smaller, and more frequency domain extension subcarriers or reserved subcarriers can be adopted for coding modulation processing, so that a larger PAPR performance gain is obtained, that is, the PAPR performance of the transmitting waveform is optimized on the premise of ensuring the BLER performance of the system.

A device including a plurality of functional units shown in fig. 10 is described below. The apparatus described herein includes a plurality of functional units as shown in fig. 10. Fig. 11 is a schematic diagram of a communication device provided in the present application, for implementing a communication method in the above method embodiment. The communication device 1100 may also be a system-on-chip. It is understood that the communication device 1100 may be, for example, a terminal device or a network device.

Wherein the communication device 1100 comprises a communication interface 1101 and a processor 1102. The communication interface 1101 may be, for example, a transceiver, an interface, a bus, a circuit, or a device capable of implementing a transceiving function. Wherein the communication interface 1101 is for communicating with other devices over a transmission medium, such that the device 1100 may communicate with other devices. The processor 1102 is configured to perform process-related operations.

In a possible implementation manner, the processor 1102 is configured to determine the number of first subcarriers according to the first code modulation parameter. The communication interface 1101 is for transmitting the first signal on the second subcarrier. The first code modulation parameter is used for code modulation processing, the first subcarrier is a frequency domain expansion subcarrier or a reserved subcarrier, and the value of the number of the first subcarriers is related to the value of the first code modulation parameter; when the number of the first subcarriers is not 0, the second subcarriers include the frequency domain extended subcarriers and subcarriers before the frequency domain extension, or the second subcarriers include the reserved subcarriers and subcarriers before the reservation.

The specific execution flow of the communication interface 1101 and the processor 1102 in this embodiment may refer to the description of the first aspect and the method embodiments corresponding to fig. 6 to 9, which are not repeated herein. The number of first subcarriers in the communication method implemented by the communication device may vary with the first code modulation parameter. For example, when the spectrum efficiency is smaller, the coding performance loss caused by the code rate improvement is smaller, and more frequency domain extension subcarriers or reserved subcarriers can be adopted for data transmission, so that a larger PAPR performance gain is obtained, that is, the PAPR performance of the transmitting waveform is optimized on the premise of ensuring the BLER performance of the system.

In another possible implementation, the processor 1102 is configured to determine the number of first subcarriers according to a first code modulation parameter. The first code modulation parameter is used for code modulation processing, the first subcarrier is a frequency domain expansion subcarrier or a reserved subcarrier, and the value of the number of the first subcarriers is related to the value of the first code modulation parameter. The communication interface 1101 is configured to receive the first signal on the second subcarrier. When the number of the first subcarriers is not 0, the second subcarriers include frequency domain extended subcarriers and subcarriers before frequency domain extension, or the second subcarriers include reserved subcarriers and subcarriers before reservation.

The specific execution flow of the communication interface 1101 and the processor 1102 in this embodiment may refer to the description of the second aspect and the method embodiments corresponding to fig. 6 to 9, which are not repeated herein. The number of first subcarriers in the communication method implemented by the communication device may vary with the first code modulation parameter. For example, when the spectrum efficiency is smaller, the coding performance loss caused by the code rate improvement is smaller, and more frequency domain extension subcarriers or reserved subcarriers can be adopted for data transmission, so that a larger PAPR performance gain is obtained, that is, the PAPR performance of the transmitting waveform is optimized on the premise of ensuring the BLER performance of the system.

In another possible implementation, the processor 1102 is configured to determine the number of first subcarriers according to the first coded modulation factor. The communication interface 1101 is configured to send indication information to the terminal device, where the indication information includes the number N of the first subcarriers or the first ratio. The first code modulation parameter is used for code modulation processing, the first subcarrier is a frequency domain expansion subcarrier or a reserved subcarrier, the value of the number of the first subcarrier is related to the value of a code modulation coefficient, and the first ratio is the ratio of the number of the frequency domain expansion subcarriers to the number of the subcarriers before the frequency domain expansion, or the first ratio is the ratio of the number of the reserved subcarriers to the number of the subcarriers before the reservation. The communication interface 1101 is also for receiving a first signal from a terminal device on a second subcarrier. When the number of the first subcarriers is not 0, the second subcarriers include frequency domain extended subcarriers and subcarriers before frequency domain extension, or the second subcarriers include reserved subcarriers and subcarriers before reservation.

The specific execution flow of the communication interface 1101 and the processor 1102 in this embodiment may refer to the description of the third aspect and the method embodiments corresponding to fig. 6 to 9, which are not repeated herein. The communication method implemented by the communication device can be applied to an uplink data transmission scene that the network device sends the indication information to the terminal device, and the terminal device sends the coded modulation data to the network device according to the indication information. In the transmission scenario, the network device may directly indicate the frequency domain expansion ratio or the subcarrier reservation ratio to the terminal device, so that the terminal device may directly perform code modulation processing on the data bits according to the frequency domain expansion ratio or the subcarrier reservation ratio to obtain the first signal. For example, when the spectrum efficiency is smaller, the coding performance loss caused by the code rate improvement is smaller, and more frequency domain extension subcarriers or reserved subcarriers can be adopted for coding modulation processing, so that a larger PAPR performance gain is obtained, that is, the PAPR performance of the transmitting waveform is optimized on the premise of ensuring the BLER performance of the system.

In another possible implementation, the communication interface 1101 is configured to receive indication information from a network device, where the indication information includes a number of first subcarriers or a first ratio. The first subcarrier is a frequency domain expansion subcarrier or a reserved subcarrier, the number of the first subcarriers is determined according to a first code modulation coefficient, the value of the number of the first subcarriers is related to the value of the code modulation coefficient, and the first ratio is the ratio of the number of the frequency domain expansion subcarriers to the number of the subcarriers before the frequency domain expansion, or the first ratio is the ratio of the number of the reserved subcarriers to the number of the subcarriers before the reservation. The communication interface 1101 is also for transmitting the first signal to the network device on the second subcarrier. When the number of the first subcarriers is not 0, the second subcarriers comprise the frequency domain expansion subcarriers and the subcarriers before the frequency domain expansion, or the second subcarriers comprise the reserved subcarriers and the subcarriers before the reservation.

The specific execution flow of the communication interface 1101 and the processor 1102 in this embodiment may refer to the fourth aspect and descriptions in the method embodiments corresponding to fig. 6 to 9, which are not repeated herein. The communication method implemented by the communication device can be applied to an uplink data transmission scene that the network device sends the indication information to the terminal device, and the terminal device sends the coded modulation data to the network device according to the indication information. In the transmission scene, the terminal equipment directly receives the indication information, so that the indicated frequency domain expansion ratio or subcarrier reservation ratio is obtained, and the terminal equipment directly carries out code modulation processing on data bits according to the frequency domain expansion ratio or subcarrier reservation ratio to obtain a first signal. For example, when the spectrum efficiency is smaller, the coding performance loss caused by the code rate improvement is smaller, and more frequency domain extension subcarriers or reserved subcarriers can be adopted for coding modulation processing, so that a larger PAPR performance gain is obtained, that is, the PAPR performance of the transmitting waveform is optimized on the premise of ensuring the BLER performance of the system.

Optionally, the communication device 1100 may also include at least one memory 1103 for storing program instructions and/or data. In one embodiment, the memory is coupled to the processor. The coupling in this application is an indirect coupling or communication connection between devices, units, or modules, which may be in electrical, mechanical, or other form for the exchange of information between the devices, units, or modules. The processor may operate in conjunction with the memory. The processor may execute program instructions stored in the memory. The at least one memory and the processor are integrated.

The specific connection medium between the communication interface, the processor, and the memory is not limited in this application. For example, the memory, the processor, and the communication interface are connected by a bus, and the bus 1104 is shown in fig. 11 by a thick line, and the connection between other components is merely schematically illustrated and not limited thereto. The buses may be classified as address buses, data buses, control buses, etc. For ease of illustration, only one thick line is shown in FIG. 11, but not only one bus or one type of bus.

In this application, the processor may be a general purpose processor, a digital signal processor, an application specific integrated circuit, a field programmable gate array or other programmable logic device, a discrete gate or transistor logic device, a discrete hardware component, and may implement or perform the methods, steps, and logic blocks disclosed herein. The general purpose processor may be a microprocessor or any conventional processor or the like. The steps of a method disclosed in connection with the present application may be embodied directly in a hardware processor or in a combination of hardware and software modules within a processor.

In the present application, the memory may be a nonvolatile memory such as a hard disk (HDD) or a Solid State Drive (SSD), or may be a volatile memory (RAM) such as a random-access memory (RAM). The memory is any other medium that can be used to carry or store desired program code in the form of instructions or data structures and that can be accessed by a computer, but is not limited to such. The memory in this application may also be circuitry or any other device capable of performing the function of storing program instructions and/or data.

The present application provides a communication system including a terminal device and a network device in the corresponding embodiments as in fig. 6 to 9.

The present application provides a computer-readable storage medium. The computer-readable storage medium stores a program or instructions. The program or instructions, when run on a computer, cause the computer to perform the communication method in the corresponding embodiment as in fig. 6 to 9.

A computer program product is provided herein. The computer program product includes instructions. The instructions, when executed on a computer, cause the computer to perform the communication method in the corresponding embodiment as in fig. 6 to 9.

The present application provides a chip or chip system comprising at least one processor and an interface, the interface and the at least one processor being interconnected by wires, the at least one processor being adapted to execute computer programs or instructions for performing the communication method as in the corresponding embodiments of fig. 6-9.

The interface in the chip may be an input/output interface, a pin, a circuit, or the like.

The above-mentioned chip system may be a System On Chip (SOC) or a baseband chip, etc., where the baseband chip may include a processor, a channel encoder, a digital signal processor, a modem, an interface module, etc.

In one implementation, the chip or chip system described above in this application further includes at least one memory having instructions stored therein. The memory may be a memory unit within the chip, such as a register, a cache, etc., or may be a memory unit of the chip (e.g., a read-only memory, a random access memory, etc.).

The technical solution provided in the present application may be implemented in whole or in part 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 the computer program instructions are loaded and executed on a computer, the processes or functions described in the present application are produced in whole or in part. The computer may be a general purpose computer, a special purpose computer, a computer network, a network device, a terminal device, or other programmable apparatus. The computer instructions may be stored in a computer-readable storage medium or transmitted from one computer-readable storage medium to another computer-readable storage medium, for example, the computer instructions may be transmitted from one website, computer, server, or data center to another website, computer, server, or data center by a wired (e.g., coaxial cable, fiber optic, digital subscriber line (digital subscriber line, DSL)) or wireless (e.g., infrared, wireless, microwave, etc.). The computer readable storage medium may be any available medium that can be accessed by a computer or a data storage device such as a server, data center, etc. that contains an integration of one or more available media. The usable medium may be a magnetic medium (e.g., floppy disk, hard disk, magnetic tape), an optical medium (e.g., digital video disc (digital video disc, DVD)), or a semiconductor medium, etc.

In this application, embodiments may refer to each other without logical contradiction, e.g., methods and/or terms between method embodiments may refer to each other, e.g., functions and/or terms between apparatus embodiments and method embodiments may refer to each other.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present application without departing from the scope of the application. Thus, if such modifications and variations of the present application fall within the scope of the claims and the equivalents thereof, the present application is intended to cover such modifications and variations.

Claims

1. A method of communication, comprising:

determining the number of first subcarriers according to a first code modulation parameter, wherein the first code modulation parameter is used for code modulation processing, and the first subcarriers are frequency domain expansion subcarriers or reserved subcarriers;

wherein the value of the number of the first subcarriers is related to the value of the first code modulation parameter;

transmitting the first signal on the second subcarrier;

when the number of the first subcarriers is not 0, the second subcarriers include the frequency domain extended subcarriers and subcarriers before frequency domain extension, or the second subcarriers include the reserved subcarriers and subcarriers before reservation.

2. The method of claim 1, wherein the step of determining the position of the substrate comprises,

the first coded modulation parameter is a modulation and coding scheme, MCS, index, or coding rate, or modulation order,

wherein one MCS index corresponds to one coding rate and one modulation order.

3. The method of claim 2, wherein the step of determining the position of the substrate comprises,

the first code modulation parameter is determined according to downlink control information DCI for scheduling a current transmission.

4. The method of claim 2, wherein the step of determining the position of the substrate comprises,

the first code modulation parameter belongs to a first code modulation parameter set;

at least two different code modulation parameters lambda exist in the first code modulation parameter set ₁ And lambda (lambda) ₂ ，

The lambda is ₁ Greater than said lambda ₂ The lambda is ₁ The corresponding first ratio is smaller than the lambda ₂ A corresponding first ratio of the values of the first ratio,

5. The method of claim 2, wherein the step of determining the position of the substrate comprises,

The lambda is ₃ Greater than said lambda ₄ The lambda is ₃ A corresponding first ratio is less than or equal to the lambda ₄ A corresponding first ratio of the values of the first ratio,

6. The method according to claim 4 or 5, wherein,

when the value of the first code modulation parameter is smaller than or equal to a first threshold value, a first ratio alpha corresponding to the value x of the first code modulation parameter ₁ The method meets the following conditions:

α ₁ ＝μ ₁ *x+μ ₂ ，

wherein the mu ₁ Is a negative real number, the mu ₂ Is a positive real number.

7. The method of claim 6, wherein the step of providing the first layer comprises,

when the value of the first code modulation parameter is greater than the first threshold value, a first ratio alpha corresponding to the value x of the first code modulation parameter ₁ Is a first value.

8. The method according to any one of claims 1 to 5, wherein determining the number of first subcarriers based on the first coded modulation parameter comprises:

rounding the number N of the first sub-carriers to obtain rounded number N' of the first sub-carriers,

And N' is an integer multiple of the positive integer a.

9. The method of claim 8, wherein the positive integer a is 1 or 12.

10. The method according to claim 4 or 5, wherein after determining the number of first sub-carriers according to the first code modulation parameter, the method further comprises:

determining a coding rate according to a first ratio corresponding to the first coding modulation parameter or a first ratio corresponding to the first subcarrier after the number of the first subcarriers is rounded;

coding the data bits according to the coding code rate to obtain coding code words;

modulating the code word according to the modulation order corresponding to the MCS index to obtain a modulation symbol;

performing discrete Fourier transform processing on the modulation symbols to obtain frequency domain signals;

performing cyclic extension or subcarrier reservation processing on the frequency domain signal to obtain the first signal;

the first ratio corresponding to the rounded number of the first subcarriers is the ratio of the rounded number of the frequency domain expansion subcarriers to the number of the subcarriers before the frequency domain expansion; or, the first ratio corresponding to the rounded number of the first subcarriers is the ratio of the rounded number of reserved subcarriers to the number of subcarriers before reservation.

11. A method of communication, comprising:

determining the number of first subcarriers according to a first code modulation parameter, wherein the first code modulation parameter is used for code modulation processing; the first subcarrier is a frequency domain expansion subcarrier or a reserved subcarrier;

receiving the first signal on the second subcarrier;

12. The method of claim 11, wherein the step of determining the position of the probe is performed,

wherein one MCS index corresponds to one coding rate and one modulation order.

13. The method of claim 12, wherein the step of determining the position of the probe is performed,

14. The method of claim 12, wherein the step of determining the position of the probe is performed,

15. The method of claim 12, wherein the step of determining the position of the probe is performed,

16. The method according to claim 14 or 15, wherein,

When the value of the first code modulation parameter is smaller than or equal to a first threshold value, a first ratio alpha corresponding to the value x of the first code modulation parameter meets the following conditions:

α＝μ ₁ *x+μ ₂ ，

17. The method of claim 16, wherein the step of determining the position of the probe comprises,

when the value of the first code modulation parameter is larger than the first threshold value, a first ratio alpha corresponding to the value x of the first code modulation parameter is a first value.

18. The method according to any one of claims 11 to 15, wherein determining the number of first sub-carriers according to the first coded modulation parameter comprises:

and N' is an integer multiple of the positive integer a.

19. The method of claim 18, wherein the positive integer a is 1 or 12.

20. The method according to claim 14 or 15, wherein after the receiving the first signal on the second subcarrier, the method further comprises:

performing de-cyclic expansion or sub-carrier reservation processing on the first signal to obtain a frequency domain signal;

Carrying out inverse discrete Fourier transform processing on the frequency domain signal to obtain a modulation symbol;

demodulating the modulation signal according to the modulation order corresponding to the MCS index to obtain a code word;

decoding the code word according to the code rate to obtain data bits;

21. A method of communication, comprising:

determining the number of first subcarriers according to a first code modulation coefficient, wherein the first code modulation parameter is used for code modulation processing, and the first subcarriers are frequency domain expansion subcarriers or reserved subcarriers;

wherein the value of the number of the first subcarriers is related to the value of the code modulation coefficient;

The indication information is sent to the terminal device,

the indication information includes the number of the first sub-carriers or a first ratio,

the first ratio is a ratio of the number of frequency domain expansion subcarriers to the number of subcarriers before the frequency domain expansion, or the first ratio is a ratio of the number of reserved subcarriers to the number of subcarriers before the reservation;

receiving a first signal from the terminal device on a second subcarrier;

when the number of the first subcarriers is not 0, the second subcarriers comprise the frequency domain expansion subcarriers and the subcarriers before the frequency domain expansion, or the second subcarriers comprise the reserved subcarriers and the subcarriers before the reservation.

22. The method of claim 21, wherein the step of determining the position of the probe is performed,

the first coded modulation factor is a modulation and coding scheme, MCS, index, or coding rate, or modulation order, or spectral efficiency,

wherein one MCS index corresponds to one coding rate and one modulation order.

23. The method of claim 22, wherein the step of determining the position of the probe is performed,

the first coded modulation coefficient belongs to a first coded modulation coefficient set;

24. The method of claim 22, wherein the step of determining the position of the probe is performed,

When said lambda is ₃ Greater than said lambda ₄ When the lambda is ₃ A corresponding first ratio is less than or equal to the lambda ₄ A corresponding first ratio of the values of the first ratio,

25. The method according to claim 23 or 24, wherein,

α＝μ ₁ *x+μ ₂ ，

26. The method of claim 25, wherein the step of determining the position of the probe is performed,

27. The method according to any one of claims 21 to 24, wherein determining the number of first sub-carriers according to the first coded modulation parameter comprises:

and N' is an integer multiple of the positive integer a.

28. The method of claim 27, wherein the positive integer a is 1 or 12.

29. The method of claim 27, wherein the step of determining the position of the probe is performed,

the indication information further comprises a first ratio value corresponding to the rounded first number of subcarriers, wherein the first ratio value corresponding to the rounded first number of subcarriers is a ratio of the rounded number of frequency domain expansion subcarriers to the number of subcarriers before frequency domain expansion; or, the first ratio corresponding to the rounded number of the first subcarriers is the ratio of the rounded number of reserved subcarriers to the number of subcarriers before reservation.

30. The method according to claim 23 or 24, wherein after the receiving the first signal from the terminal device on the second subcarrier, the method further comprises:

decoding the code word according to the code rate to obtain data bits;

31. A method of communication, comprising:

Receiving indication information from a network device, the indication information comprising a number of first sub-carriers or a first ratio,

the first subcarriers are frequency domain expansion subcarriers or reserved subcarriers, and the number of the first subcarriers is determined according to a first code modulation coefficient;

the value of the number of the first subcarriers is related to the value of the code modulation coefficient;

a first signal is transmitted to the network device on a second subcarrier,

32. The method of claim 31, wherein the step of determining the position of the probe is performed,

wherein one MCS index corresponds to one coding rate and one modulation order.

33. The method of claim 32, wherein the step of determining the position of the probe is performed,

34. The method of claim 32, wherein the step of determining the position of the probe is performed,

35. The method according to claim 33 or 34, wherein,

α＝μ ₁ *x+μ ₂ ，

36. The method of claim 35, wherein the step of determining the position of the probe is performed,

37. The method according to any of claims 31 to 34, wherein after receiving the indication information from the access network device, the method further comprises:

and N' is an integer multiple of the positive integer a.

38. The method of claim 37, wherein the positive integer a is 1 or 12.

39. The method of claim 33 or 34, wherein before the first signal is transmitted on the second subcarrier, the method further comprises:

determining a coding code rate according to the first ratio or the first ratio corresponding to the rounded first sub-carriers;

40. A communication device comprising means or modules for performing the method of any one of claims 1 to 39.

41. A communication device, comprising: a memory and a processor;

the memory is used for storing instructions;

the processor configured to execute the instructions such that the method of any one of claims 1 to 39 is performed.

42. A communication system, comprising:

a transmitting end configured to perform the method of any one of claims 1 to 10 or 31 to 39;

a receiving end for performing the method of any one of claims 11 to 20 or 21 to 30.

43. A chip, comprising a processor and an interface;

the processor is configured to read instructions to perform the method of any one of claims 1 to 39.

44. A computer readable storage medium comprising a program or instructions which, when run on a computer, performs the method of any one of claims 1 to 39.