Data indication method and apparatus

Abstract

The present application provides a data indication method. The method is applied to a first apparatus, and comprises: acquiring control information, the control information being used for indicating frequency-division multiplexing (FDM) between a demodulation reference signal (DMRS) sequence in a DMRS symbol and first data in the DMRS symbol, wherein the first data is single-carrier data. By means of the implementation, the control information can be used to indicate whether data using a single-carrier waveform can be frequency-division multiplexed with a DMRS sequence, thereby enabling the FDM between the single-carrier data and the DMRS sequence in future wireless communications, thus meeting future wireless communication service requirements.

Description

Data indication method and apparatus

[0001] The present application claims priority from the Chinese patent application No. 202411322488.X filed with the State Intellectual Property Office of China on September 23, 2024 and entitled "Data indication method and apparatus", the whole content of which is incorporated herein by reference. TECHNICAL FIELD

[0002] The present application relates to the field of wireless communication, in particular to a data indication method and apparatus. BACKGROUND

[0003] In Long-Term Evolution (LTE) and New Radio (NR) technologies, a Physical Downlink Shared Channel (PDSCH) is used to transmit downlink data, and a Physical Uplink Shared Channel (PUSCH) is used to transmit uplink data. A Demodulation Reference Signal (DMRS) carries a DMRS sequence and can be used for channel estimation when demodulating data symbols in the PDSCH / PUSCH. In addition, in NR, data symbols in the PDSCH use an Orthogonal Frequency Division Multiplexing (OFDM) waveform, and data symbols in the PUSCH use an OFDM waveform or a Discrete Fourier Transform spreading OFDM (DFT-s-OFDM) waveform. The DFT-s-OFDM waveform has a lower Peak to Average Power Ratio (PAPR) than the OFDM waveform, and thus has a higher transmission power, which is suitable for coverage-limited scenarios, such as communication between a cell edge user and a base station.

[0004] When using the OFDM waveform, NR allows data to be carried in the DMRS symbol to improve resource utilization, for example, in the form of frequency division multiplexing (FDM) of the DMRS sequence and data. However, when using a single-carrier waveform such as the DFT-s-OFDM waveform, NR does not allow data to be carried in the DMRS symbol, i.e., does not allow FDM of the DMRS sequence and data.

[0005] It can be seen that, in order to better support future wireless communication and improve resource utilization, how to enable FDM of DMRS sequence and single carrier data is a problem to be solved at present. SUMMARY

[0006] The present application provides a data indication method and device to enable FDM of DMRS sequence and single carrier data in future communication using single carrier waveform.

[0007] In a first aspect, the present application provides a data indication method, which is used for a first device and includes:

[0008] obtaining control information, the control information being used to indicate that a DMRS sequence in a demodulation reference signal (DMRS) symbol is FDMed with first data in the DMRS symbol, the first data being single carrier data.

[0009] The above implementation indicates whether data (e.g., first data) using single carrier waveform can be FDMed with DMRS sequence through control information (e.g., downlink control information (DCI); further, it can be a field in DCI), thereby enabling FDM of single carrier data and DMRS sequence in future wireless communication to meet the demand of future wireless communication service.

[0010] In a possible implementation, the method further includes determining that the DMRS sequence is FDMed with the first data based on the control information.

[0011] In a possible implementation, the control information used to indicate that the DMRS sequence in the DMRS symbol is FDMed with the first data in the DMRS symbol specifically includes:

[0012] a first field in the control information indicates that a transform precoding state is turned on;

[0013] a second field in the control information indicates that the DMRS sequence is FDMed with the first data.

[0014] In a possible implementation, the first field includes a transform precoder indicator.

[0015] In a possible implementation, the second field includes a DMRS and data FDM indication.

[0016] In a possible implementation, the first field and the second field are indicated by n-bit bits, n being a positive integer.

[0017] In a possible implementation, the control information is used to indicate that the DMRS sequence in the DMRS symbol is frequency division multiplexed (FDM) with first data in the DMRS symbol specifically includes:

[0018] A third field in the control information indicates that the conversion precoding state is turned on and the DMRS sequence is FDM with the first data.

[0019] In a possible implementation, the third field is indicated by n bits, where n is a positive integer.

[0020] In a possible implementation, the control information is used to indicate that the DMRS sequence in the DMRS symbol is frequency division multiplexed (FDM) with first data in the DMRS symbol specifically includes:

[0021] A fourth field in the control information indicates a first index value; a value of a number of DMRS CDM groups without data corresponding to the first index value is less than a value of a number of DMRS CDM groups; and the DMRS sequence is FDM with the first data corresponding to the value of the number of DMRS CDM groups without data corresponding to the first index value being less than the value of the number of DMRS CDM groups; and the conversion precoding state corresponding to the first data is turned on.

[0022] With the above implementations, the field in the control information can be expanded (for example, the “antenna port(s)” field in the protocol is expanded to obtain the fourth field, for example, the “antenna port(s)” field is originally 2 bits, indicating that the index value range is 0-3, and after expansion to 3 bits, the fourth field is obtained, indicating that the index value range is 0-7) on the basis of the current protocol (for example, “3GPP TS 38.212V18.3.0”), and the protocol agreed table (for example, Table 7.3.1.1.2-6, Table 7.3.1.1.2-6A in “3GPP TS 38.212V18.3.0”) is adjusted accordingly (for example, the number of corresponding rows in the protocol agreed table is increased, for example, the protocol agreed table only includes rows corresponding to index values 0-3, for example, Table 7.3.1.1.2-6, Table 7.3.1.1.2-6A, and the rows of index values 4-7 are added in the adjusted table), thereby supporting single-carrier data and DMRS sequence FDM.

[0023] In a possible implementation, the method further includes: obtaining first information, the first information being used to indicate a first correspondence relationship, the first correspondence relationship including a correspondence relationship between a plurality of index values and values of a number of DMRS CDM groups without data; and the first index value is one of the plurality of index values.

[0024] In a possible implementation, the first correspondence relationship further includes any one or more of the following: a DMRS port value, a number of front-loaded DMRS symbols.

[0025] In a possible implementation, the first information further includes any one or more of the following:

[0026] A transform precoding state, a modulation coding scheme (MCS), a DMRS configuration type, a DMRS sequence type, a maximum length of a DMRS, and a rank.

[0027] In a possible implementation, the DMRS sequence type includes a low PAPR generated sequence type 1 and a low PAPR generated sequence type 2; the low PAPR generated sequence type 1 includes a ZC sequence, and the low PAPR generated sequence type 2 includes a pi / 2-BPSK sequence.

[0028] In a possible implementation, when the DMRS sequence type includes the pi / 2-BPSK sequence, the first information further includes information indicating whether the pi / 2-BPSK sequence is configured to perform transform precoding.

[0029] In a possible implementation, the fourth field includes an antenna port field (antenna port(s)).

[0030] In a possible implementation, the fourth field is indicated by n bits, where n is a positive integer.

[0031] The second aspect is a method corresponding to the first aspect on the opposite side, and the beneficial effects are described with reference to the first aspect; the present application provides a data transmission method, and the method is used for a second device and includes the following steps.

[0032] Outputting control information, the control information being used to indicate that a DMRS sequence in a demodulation reference signal (DMRS) symbol is frequency division multiplexed (FDM) with first data in the DMRS symbol, and the first data is single-carrier data.

[0033] In a possible implementation, the control information used to indicate that the DMRS sequence in the DMRS symbol is FDM with the first data in the DMRS symbol specifically includes the following:

[0034] A first field in the control information indicates that a transform precoding state is enabled.

[0035] A second field in the control information indicates that the DMRS sequence is FDM with the first data.

[0036] In a possible implementation, the first field includes a transform precoder indicator.

[0037] In a possible implementation, the second field includes a DMRS and data FDM indication.

[0038] In a possible implementation, the first field and the second field are indicated by n bits, where n is a positive integer.

[0039] In a possible implementation, the control information is used to indicate that the DMRS sequence in the DMRS symbol is frequency division multiplexed (FDM) with first data in the DMRS symbol, and the control information specifically includes:

[0040] A third field in the control information indicates that a transform precoding state is turned on and the DMRS sequence is frequency division multiplexed (FDM) with the first data.

[0041] In a possible implementation, the third field is indicated by n bits, where n is a positive integer.

[0042] In a possible implementation, the control information is used to indicate that the DMRS sequence in the DMRS symbol is frequency division multiplexed (FDM) with first data in the DMRS symbol, and the control information specifically includes:

[0043] A fourth field in the control information indicates a first index value; a value of a number of DMRS CDM groups without data corresponding to the first index value is less than a value of a number of DMRS CDM groups; the DMRS sequence is frequency division multiplexed (FDM) with the first data corresponding to the value of the number of DMRS CDM groups without data corresponding to the first index value being less than the value of the number of DMRS CDM groups; and a transform precoding state corresponding to the first data is turned on.

[0044] In a possible implementation, the method further includes: outputting first information, the first information being used to indicate a first correspondence relationship, the first correspondence relationship including a correspondence relationship between a plurality of index values and values of a number of DMRS CDM groups without data; and the first index value is one of the plurality of index values.

[0045] In a possible implementation, the first correspondence relationship further includes any one or more of the following: a DMRS port value, a number of front-loaded DMRS symbols.

[0046] In a possible implementation, the first information further includes any one or more of the following:

[0047] a transform precoding state, a modulation and coding scheme (MCS), a DMRS configuration type, a DMRS sequence type, a maximum length of a DMRS, and a rank.

[0048] In a possible implementation, the DMRS sequence type includes a low PAPR generated sequence type 1 and a low PAPR generated sequence type 2; wherein the low PAPR generated sequence type 1 includes a ZC sequence, and the low PAPR generated sequence type 2 includes a pi / 2-BPSK sequence.

[0049] In a possible implementation, when the DMRS sequence type includes a pi / 2-BPSK sequence, the first information further includes information indicating whether the pi / 2-BPSK sequence is configured with a transform precoding.

[0050] In a possible implementation, the fourth field includes an antenna port field.

[0051] In a possible implementation, the fourth field is indicated by n bits, n being a positive integer.

[0052] In a third aspect, the present application provides a communication apparatus, including: a processor configured to execute a computer program or instructions stored in a memory; and the memory configured to store the computer program or the instructions; when the computer program or the instructions are executed by the processor, the method in the first aspect or the second aspect is implemented.

[0053] In a fourth aspect, the present application provides a computer readable storage medium, and the computer readable storage medium stores a computer program or instructions, so that when the computer program or instructions are executed by a computer, the method in the first aspect or the second aspect is implemented.

[0054] In a fifth aspect, the present application provides a computer program product, and the computer program product includes a method in the first aspect or the second aspect.

[0055] In a sixth aspect, the present application provides a communication system, and the system includes a first apparatus and a second apparatus; the first apparatus is configured to implement the method in the first aspect; and the second apparatus is configured to implement the method in the second aspect.

[0056] On the basis of the implementation of the above aspects, the present application can be further combined to provide more implementations. BRIEF DESCRIPTION OF DRAWINGS

[0057] FIG. 1 shows a possible architecture of a communication system provided by the present application;

[0058] FIGS. 2A to 2C show possible implementation scenarios provided by the present application;

[0059] Fig. 3 shows a typical OFDM / DFT-s-OFDM system implementation block diagram;

[0060] Fig. 4 shows a typical input / output power curve of a solid state power amplifier;

[0061] Figs. 5A-5D show possible PDSCH DMRS time-frequency resource diagrams provided by the present disclosure;

[0062] Figs. 6A-6B show another possible PDSCH DMRS time-frequency resource diagrams provided by the present disclosure;

[0063] Fig. 7 shows a DMRS and single carrier data frequency division multiplexing flow diagram;

[0064] Figs. 8A-8C show possible control information diagrams provided by the present disclosure;

[0065] Fig. 9 shows a possible communication device structure diagram provided by the present disclosure;

[0066] Fig. 10 shows another possible communication device structure diagram provided by the present disclosure. DETAILED DESCRIPTION

[0067] In order to make the purpose, technical solutions and advantages of the present disclosure clearer, the present disclosure will be further described in detail below with reference to the drawings. The specific operation method, function description, etc. in the method embodiment can also be applied to the device embodiment or the system embodiment.

[0068] The embodiments of the present disclosure can be applied to various communication systems, such as: long term evolution (LTE) system, LTE frequency division duplex (FDD) system, LTE time division duplex (TDD), universal mobile telecommunication system (UMTS), 5G system or new radio (NR), or applied to future communication systems or other similar communication systems, or ultra wide band (UWB) system, or wireless fidelity (WiFi) system.

[0069] Figure 1 shows a possible, non-limiting, schematic illustration of a system. As shown in Figure 1, the communication system 1000 includes a wireless access network 100 and a core network 200, and optionally, the communication system 1000 can also include an Internet 300. The wireless access network 100 can include at least one wireless access network device (e.g., 110a and 110b in Figure 1) and at least one terminal (e.g., 120a-120j in Figure 1). The terminal is connected to the wireless access network device in a wireless manner, and the wireless access network device is connected to the core network in a wireless or wired manner. The core network device and the wireless access network device can be independent and different physical devices, or the functions of the core network device and the logical functions of the wireless access network device can be integrated on the same physical device, or a physical device can integrate the functions of part of the core network device and part of the wireless access network device. The terminals and the terminals, and the wireless access network devices and the wireless access network devices can be connected to each other in a wired or wireless manner. Figure 1 is only a schematic diagram, and the communication system can also include other network devices, such as wireless relay devices and wireless backhaul devices, which are not shown in Figure 1.

[0070] The wireless access network device (or network device) can be a base station, an evolved NodeB (eNodeB), a transmission reception point (TRP), a next generation NodeB (gNB) in a 5G mobile communication system, a next generation NodeB in a 6th generation (6G) mobile communication system, a base station in a future mobile communication system, or an access node in a WiFi system, etc. The wireless access network device can also be an open RAN (O-RAN or ORAN), or a cloud radio access network (CRAN). The wireless access network device can also be a communication system that combines two or more of the above systems. The wireless access network device can be a macro base station (e.g., 110a in Figure 1), a micro base station or an indoor station (e.g., 110b in Figure 1), a relay node or a donor node, etc.

[0071] In addition, the wireless access network device can also be a module or unit that completes the function of the base station part, for example, can be a central unit (CU), a distributed unit (DU), a CU-control plane (CP), a CU-user plane (UP), or a radio unit (RU), etc. In different systems, the CU (or CU-CP and CU-UP), DU or RU can also have different names, but those skilled in the art can understand its meaning. For example, in the ORAN system, the CU can also be referred to as O-CU (open CU), the DU can also be referred to as O-DU, the CU-CP can also be referred to as O-CU-CP, the CU-UP can also be referred to as O-CU-UP, and the RU can also be referred to as O-RU. For the convenience of description, the CU, CU-CP, CU-UP, DU and RU are taken as examples for description in the present application. Any one of the CU (or CU-CP, CU-UP), DU and RU in the present application can be implemented by a software module, a hardware module, or a combination of a software module and a hardware module.

[0072] The embodiments of the present application do not limit the specific technology and specific device form adopted by the wireless access network device. For the convenience of description, the base station is taken as an example of the wireless access network device in the following description. It can be understood that the base station can be referred to as a communication device. For example, the base station can be understood as a device with the function of the base station. For example, the device for implementing the function of the base station can be the base station; or part of the elements in the base station, for example, CU, DU, etc. It can also be a device capable of supporting the base station to implement the function, for example, a chip system, a hardware circuit, a software module, or a hardware circuit plus a software module, which can be installed in the base station or can be used with the base station. In the embodiments of the present application, the chip system can be composed of a chip, or can include a chip and other discrete devices.

[0073] The terminal can also be referred to as a terminal device, user equipment (UE), mobile station, mobile terminal, etc. The terminal can be widely applied to various scenarios, such as device-to-device (D2D), vehicle to everything (V2X) communication, machine-type communication (MTC), internet of things (IOT), virtual reality, augmented reality, industrial control, automatic driving, remote medical treatment, smart power grid, smart furniture, smart office, smart wear, smart transportation, smart city, etc. The terminal can be a mobile phone, tablet computer, computer with wireless transceiver function, wearable device, vehicle, unmanned aerial vehicle, helicopter, airplane, ship, robot, mechanical arm, smart home device, etc.

[0074] Embodiments of the present application do not limit the specific technology and specific device form adopted by the terminal. It can be understood that the terminal can be referred to as a communication apparatus. For example, the terminal can be understood as an apparatus with terminal functions. For example, the apparatus for implementing the functions of the terminal can be a terminal; it can also be an apparatus capable of supporting the terminal to implement the functions, such as a chip system, a hardware circuit, a software module, or a hardware circuit plus a software module, which can be installed in the terminal or can be used in matching with the terminal.

[0075] The base station and the terminal can be fixed in position or movable. The base station and the terminal can be deployed on land, including indoors or outdoors, handheld or vehicle-mounted; can also be deployed on water surface; can also be deployed on airplanes, balloons and artificial satellites. Embodiments of the present application do not limit the application scenarios of the base station and the terminal.

[0076] The roles of the base station and the terminal can be relative, for example, the helicopter or unmanned aerial vehicle 120i in FIG. 1 can be configured as a mobile base station, and for those terminals 120j accessing the wireless access network 100 through 120i, the unmanned aerial vehicle 120i is a base station; but for the base station 110a, 120i is a terminal, that is, 110a and 120i communicate through a wireless air interface protocol. Of course, 110a and 120i can also communicate through a base station-to-base station interface protocol, at this time, relative to 110a, 120i is also a base station. Therefore, the base station and the terminal can be collectively referred to as a communication apparatus, 110a and 110b in FIG. 1 can be referred to as a communication apparatus with base station functions, and 120a-120j in FIG. 1 can be referred to as a communication apparatus with terminal functions.

[0077] The base station and the terminal, the base station and the base station, the terminal and the terminal can communicate through a licensed spectrum, or through an unlicensed spectrum, or through both the licensed spectrum and the unlicensed spectrum; can communicate through a spectrum below 6 gigahertz (GHz), or through a spectrum above 6 GHz, or through both the spectrum below 6 GHz and the spectrum above 6 GHz. Embodiments of the present application do not limit the spectrum resources used for wireless communication.

[0078] In the absence of special description in the present application, the first device and the second device are described as the execution subject.

[0079] The first device can be understood as a terminal, or a device with terminal function, or a device implementing terminal function. For example, the first device is a terminal, or the first device can be a module (such as a chip or a circuit, etc.) in the terminal. Alternatively, the first device can be understood as a base station, or a device with base station function, or a device implementing base station function. For example, the first device is a base station, or the first device can be a module (such as a chip or a circuit, etc.) in the base station, or a module or unit (such as CU, DU or RU) implementing all or part of the base station function, a logic module or software, etc. Alternatively, the first device can be understood as a device or apparatus with sensing capability, or a device or apparatus capable of performing artificial intelligence tasks. The device with sensing capability can also be referred to as a sensing device, and the device capable of performing artificial intelligence tasks can also be referred to as an artificial intelligence task performing device.

[0080] The second device can be understood as a terminal, or a device with terminal function, or a device implementing terminal function. For example, the second device is a terminal, or the second device can be a module (such as a chip or a circuit, etc.) in the terminal. Alternatively, the second device can be understood as a base station, or a device with base station function, or a device implementing base station function. For example, the second device is a base station, or the second device can be a module (such as a chip or a circuit, etc.) in the base station, or a module or unit (such as CU, DU or RU) implementing all or part of the base station function, a logic module or software, etc. Alternatively, the second device can be understood as a device or apparatus with sensing capability, or a device or apparatus capable of performing artificial intelligence tasks. The device with sensing capability can also be referred to as a sensing device, and the device capable of performing artificial intelligence tasks can also be referred to as an artificial intelligence task performing device.

[0081] Further, the first device can be a sending end or a receiving end, and correspondingly, the second device can be a receiving end or a sending end. For ease of description, the first device is taken as the sending end and the second device is taken as the receiving end in the following description.

[0082] In addition, the "first device" can be replaced by "first apparatus", or "first communication device", and the "second device" can be replaced by "second apparatus", or "second communication device".

[0083] In some possible implementation scenarios, the "first device" can be a "terminal", and the "second device" can be a "base station". Alternatively, the "first device" can be a "base station", and the "second device" can be a "terminal". For example, in FIG. 2A, one or more terminals can communicate with a base station respectively. An interface between the terminal and the base station is a Uu interface.

[0084] In some possible implementation scenarios, the "first device" can be a "first terminal", and the "second device" can be a "second terminal". For example, in FIG. 2B, terminal 1 can communicate with terminal 3, and terminal 2 can communicate with terminal 3. An interface between terminal 3 and terminal 1 can be a sidelink, and an interface between terminal 3 and terminal 2 can also be a sidelink. In addition, terminal 3 can send data of terminal 1, data of terminal 2, and data of terminal 3 to a base station. At this time, terminal 3 can also be understood as a relay terminal. An interface between terminal 3 and the base station is a Uu interface.

[0085] In some possible implementation scenarios, the "first device" can be a "first base station", and the "second device" can be a "second base station". For example, in FIG. 2C, base station 1 and base station 2 can communicate. An interface between base station 1 and base station 2 can be an X2 interface.

[0086] In the present application, "sending" and "receiving" represent the direction of signal transmission. For example, "sending information to XX" can be understood as that the destination of the information is XX, and "sending information" can include direct sending or indirect sending through other units or modules. "Receiving information from YY" can be understood as that the source of the information is YY, and "receiving information" can include direct receiving from YY or indirect receiving from YY through other units or modules. In addition, "sending" can also be understood as "output" of a chip interface, and "receiving" can also be understood as "input" of the chip interface. In other words, "sending" or "receiving" can be performed between devices, for example, between a base station and a terminal through an air interface, or can be performed within a device, for example, between components, between modules, between chips, between software modules or between hardware modules in the device through a bus, a wire or an interface.

[0087] It can be understood that, for the convenience of description, the first device is taken as a receiving end and the second device is taken as a sending end for example in the description.

[0088] In order to facilitate understanding of the embodiments of the present application, the terms involved in the present application are briefly explained below. It can be understood that the following explanation of the terms is only for facilitating the understanding of the present application by those skilled in the art, and does not limit the scheme in the embodiments of the present application.

[0089] 1. Orthogonal Frequency Division Multiplexing (OFDM):

[0090] As shown in FIG. 3, it is a typical block diagram of an NR OFDM system. Wherein, the signal {S(p)} is a frequency domain signal. As shown in FIG. 3, a serial-to-parallel (S / P) module converts M consecutive data S(kM), S(kM+1), …, S(kM+M-1) into an M-dimensional data block S k =[S(kM), S(kM+1), …, S(kM+M-1)] T , where the subscript k is the OFDM symbol number, and the superscript T represents transposition; through subcarrier mapping, S k carries M data to modulate N sc subcarriers of N sc =M, and the remaining (N-N sc ) subcarriers can be understood as being modulated by data 0. An N-dimensional data vector X k is obtained through N-point IDFT to obtain a set of N complex time domain sampling points x k =[x k (0), x k (1), …, x k (N-1)] T .

[0091] Wherein, x k (n), n=0, 1, …, N-1 can be written as:

[0092] Wherein, X k (n'), n'=0, 1, …, N-1 represents the output of the subcarrier mapping module, e represents Euler's constant, j represents the imaginary unit, and j 2 =-1. The subcarrier mapping rule is as follows:

[0093] Wherein, n0 is an integer, S k (l) is the lth element of S k , l=0, 1, …, N sc-1.

[0094] The next important operation to generate an OFDM signal is to insert a guard interval at the beginning of each OFDM symbol, which can eliminate inter-symbol interference (ISI) caused by multipath propagation (a propagation phenomenon where a radio signal reaches the receiver by two or more paths). The guard interval is obtained by adding a Cyclic Prefix (CP) at the beginning of the symbol. Specifically, the last G samples of x k are copied and appended at the beginning of x k , resulting in a time-domain OFDM signal x Thus, an OFDM symbol contains valid data x k and a cyclic prefix (redundant data).

[0095] At the receiver, the OFDM signal is demodulated by inverse processing. Assuming time and frequency synchronization is available and the CP length is sufficient, after the CP removal operation (i.e., the first G samples of the received signal are removed), a data block containing N samples without any ISI is obtained, which is also equal to the cyclic convolution of the OFDM symbol x k and the channel impulse response. The time-domain cyclic convolution can be converted to a frequency-domain point multiplication by DFT, and then the channel equalization can be completed by a frequency-domain single-tap equalizer with low complexity.

[0096] S k may include modulation symbols and / or redundant signal sampling points. The modulation symbols can be modulation symbols obtained by modulating a (coded) bit stream. The modulation method can include pulse amplitude modulation (PAM), phase shift keying (PSK), quadrature amplitude modulation (QAM), amplitude phase shift keying (APSK), etc.

[0097] The redundant signal sampling points can include phase tracking reference signal (PTRS) sampling points, demodulation reference signals, tone reservation signals, etc.

[0098] It can be understood that when the transform point number N satisfies certain constraints, such as N being a power of 2, 3, 5, the IDFT can also be implemented by an efficient inverse fast fourier transform (IFFT). Correspondingly, the DFT can also be implemented by an efficient FFT. In the following, IDFT and IFFT can be interchangeable, and DFT and fast fourier transform (FFT) can be interchangeable.

[0099] N sc It can be understood that the number of subcarriers in the transmission bandwidth. In the foregoing, N sc =M. It should be understood that N sc may also be greater than M. For example, the remaining (N sc -M) subcarriers carry redundant signals to achieve other purposes, such as reducing the signal PAPR.

[0100] 2. Discrete Fourier Transform spreading OFDM (DFT-s-OFDM):

[0101] As shown in FIG. 3, DFT-s-OFDM defines a data block s k transmitted in the time domain. Before the OFDM processing process, there is an additional DFT (discrete fourier transform) processing, that is, an M-point DFT operation is performed on each data block s k containing M data, to obtain S k . Through this operation, the DFT-s-OFDM signal has the characteristics of a single carrier, and has a peak to average power ratio (PAPR) much lower than that of a multi-carrier signal such as OFDM. Therefore, under the same power amplifier, DFT-s-OFDM can provide greater output power and higher power amplifier efficiency, thereby achieving the purpose of improving coverage and reducing energy consumption. The coverage and power consumption advantages of DFT-s-OFDM are particularly evident on the terminal device side, so in the existing versions of LTE and NR, DFT-s-OFDM is applied to uplink transmission.

[0102] Wherein, s k may include modulation symbols and / or redundant signal sampling points. The modulation symbols can be modulation symbols obtained by modulating a (coded) bit stream. The modulation method can include PAM, PSK, QAM, offset quadrature amplitude modulation (OQAM), APSK, etc. The redundant signal sampling points can include PTRS sampling points, unique words, zeros, etc.

[0103] 3. and QPSK and QAM:

[0104] NR protocol 38.211 section 5.1 defines bit mapping schemes including QSPK and QAM. QSPK can also be referred to as 4QAM. Take a modulation mapper as an example, which maps the ith bit b(i) to the ith symbol d(i) according to the following formula:

[0105] Take a QPSK modulation mapper as an example, which maps two consecutive bits to a QPSK symbol, and the specific mapping is as follows:

[0106] where b(2i) and b(2i+1) represent the 2i and 2i+1 bits respectively, and d(i) represents the ith QPSK symbol. Take a 16QAM modulation mapper as an example, which maps four consecutive bits to a 16QAM symbol, and the specific mapping is as follows:

[0107] where b(4i), b(4i+1), b(4i+2) and b(4i+3) represent the 4i, 4i+1, 4i+2 and 4i+3 bits respectively, and d(i) represents the ith 16QAM symbol.

[0108] It can be understood that in future communication systems, bit mapping schemes such as QSPK and QAM can have other implementation forms, and the above examples are only illustrative and do not limit the scheme in the present application.

[0109] 4. Power amplifier output power backoff:

[0110] ​​Before a signal is transmitted through an antenna, it will go through a power amplifier (PA) to boost the signal power. One of the most basic ways to describe the behavior of a PA is its AM-AM (Amplitude Modulation-Amplitude Modulation) and AM-PM (Amplitude Modulation-Phase Modulation) characteristics. As shown in Figure 4, an AM-AM curve of a typical solid-state PA is given, which describes the output power as a function of the input power. It can be seen that the amplifier has a linear operating region. Within this region, the output power of the amplifier increases linearly with the input power. It can also be understood that the PA gain (i.e. the ratio of the PA output power and the input power) remains constant or the AM-AM curve slope remains constant. As the input power continues to increase, the amplifier enters a nonlinear region, the output power no longer increases linearly with the input power, the gain is compressed, and the AM-AM curve slope decreases. When the saturation output power is reached, i.e. the output power no longer increases with the increase of the input power, the slope is 0.

[0111] The impact of this nonlinear characteristic of the PA on the transmitted signal is manifested as in-band distortion and out-of-band distortion. The in-band distortion mainly manifests as distortion in amplitude and phase of the signal, which deteriorates the signal demodulation / detection performance. The out-of-band distortion mainly manifests as signal spectrum expansion / regeneration, which will increase the interference to adjacent channel users. In order to alleviate the impact of PA nonlinearity, the power of the input signal can be appropriately reduced, i.e. input power backoff (IBO) or output power backoff (OBO), so that the PA works as much as possible in the linear region, but this is a method at the cost of reducing the efficiency of the PA.

[0112] 5. Peak to Average Power Ratio (PAPR):

[0113] Peak to Average Power Ratio, literally means the ratio of peak power to average power. For a signal x(t), the peak power of the signal within a certain time interval (such as t0 to t1) is and the average power is PAPR can be expressed as:

[0114] Among them, the communication signal (including OFDM, DFT-s-OFDM signal) is a random signal, and the average power can be regarded as a fixed value, and the peak power is indeed a random variable. Therefore, the PAPR is also a random variable. In statistics, the value of a random signal at a certain time is often described by the probability density function. In the communication industry, engineers often use the complementary cumulative distribution function (complementary cumulative distribution function, CCDF) curve to describe the PAPR: the probability of the instantaneous power exceeding the average power xx dB is yy, or the proportion of time when the instantaneous power exceeds the average power xx dB is yy, which can be expressed by the formula:

[0115] Where P(·) represents the probability. In the PAPR graph in the following text, the horizontal axis corresponds to xx, and the vertical axis corresponds to yy.

[0116] The higher the PAPR of the PA input signal x(t), the greater the range of input power fluctuation, and the more power value needs to be backed off to ensure that the signal is in the linear amplification range. Therefore, designing a signal with low PAPR can reduce the PA OBO, increase the transmission power, and improve coverage.

[0117] 6. Antenna port (Port):

[0118] The antenna port is a logical concept. One antenna port can correspond to one physical transmitting antenna, or it can correspond to multiple physical transmitting antennas. In these two cases, the receiver of the terminal will not decompose the signal from the same antenna port. Because from the perspective of the terminal, whether the channel is formed by a single physical transmitting antenna or combined by multiple physical transmitting antennas, the reference signal (reference signal, RS) corresponding to this antenna port defines this antenna port, for example, the DMRS port corresponding to the DMRS port. The terminal can obtain the channel estimation of the corresponding antenna port according to the reference signal. Each antenna port corresponds to a time / frequency resource grid and has its own reference signal. An antenna port is a channel, and the terminal performs channel estimation and data demodulation according to the reference signal corresponding to the antenna port.

[0119] An antenna port is usually associated with a reference signal, which can be understood as a transceiving interface on the channel experienced by the reference signal. For low frequency systems, one antenna port can correspond to one or more antenna elements, which jointly transmit the reference signal, and the receiving end can regard them as a whole without distinguishing the elements. For high frequency systems, an antenna port can correspond to a beam, and similarly, the receiving end only needs to regard the beam as an interface without distinguishing each element.

[0120] In the embodiments of the present application, the antenna port can also be referred to as a port, and the set corresponding to the plurality of antenna ports can be referred to as a port group. For example, a plurality of digital ports of a base station are grouped to form a plurality of port groups. For another example, a port group can be a plurality of digital ports corresponding to a same analog beam, which is referred to as a port group or a digital-analog port group; or a port group can be a set of digital ports corresponding to a plurality of analog beams, which is referred to as a port group or a digital-analog port group. Alternatively, a plurality of digital ports of a same analog beam are divided into a plurality of subsets, and each subset is referred to as a port group or a digital-analog port group.

[0121] 7. Modulation and Coding Scheme (MCS):

[0122] The MCS defines the number of information bits that a resource unit (RE) can carry. There are 0-31 MCS schemes in NR in total, and some numbers are reserved. The modulation scheme and code rate in the MCS are defined as follows.

[0123] Modulation scheme: 5G NR supports optional modulation schemes including pi / 2-BPSK, QPSK, 16QAM, 64QAM, etc. Using pi / 2-BPSK, each RE can transmit 1 bit, corresponding to a modulation order of 1; using QPSK, each RE can transmit 2 bits, corresponding to a modulation order of 2; using 16QAM, each RE can transmit 4 bits, corresponding to a modulation order of 4; using 64QAM, each RE can transmit 6 bits, corresponding to a modulation order of 6;

[0124] Code rate: the ratio between the number of information bits and the number of coded bits. The lower the code rate, the more redundancy added in the coding process.

[0125] 3GPP specification 38.214 provides two tables for the device to select for PUSCH using DFT-s-OFDM waveform, corresponding to Table 1-Table 2.

[0126] As shown in Table 1-Table 2, the corresponding relationship between MCS index, MCS modulation order, target code rate and spectral efficiency is as follows (wherein, for Table 1, if the high layer parameter tp-pi2BPSK is configured, q = 1, otherwise q = 2; for Table 2, if the high layer parameter tp-pi2BPSK is configured, q = 1, otherwise q = 2):

[0127] Table 1

[0128] Table 2

[0129] 8. Zadoff-Chu (ZC) sequence:

[0130] ZC sequence X q (m) can be expressed as:

[0131] wherein, m is the serial number of ZC sequence element, m is an integer and 0≤m≤M zc -1, M zc is the length of the ZC sequence, j is the imaginary unit, q is the root of the ZC sequence, q and N zc are coprime. In 5G NR, N zc is the largest prime number less than M zc .

[0132] The ZC sequence determined by q can also be referred to as the q zc th ZC root sequence with a length of M th .

[0133] 9. Demodulation Reference Signal (DMRS):

[0134] In a wireless communication system, a reference signal (RS), also called pilot signal, is a predefined signal transmitted by a transmitting device on predefined resources to a receiving device. The receiving device can obtain channel related information according to the received reference signal, complete channel estimation or channel measurement. The channel measurement result can be used for resource scheduling and link adaptation, and the channel estimation result can be used for the receiving device to demodulate data. Generally, in order to accurately obtain channel related information, different reference signals need to be orthogonal. Time division, frequency division or code division can be used to provide multiple orthogonal reference signals. In current communication systems (such as LTE and NR), uplink reference signals include uplink demodulation reference signals (DMRS) and uplink sounding reference signals (SRS), and downlink reference signals include cell-specific reference signals (CRS), downlink DMRS, channel state information reference signals (CSI-RS), multimedia broadcast multicast service single frequency network reference signals (MBSFN RS) and positioning reference signals (PRS).

[0135] Wherein, information is sent from the sending end, and is received at the receiving end after passing through the transmission channel. Due to the changes (noise, fading, etc.) of the information in the transmission channel, the received information may be different from the sent information. In order to accurately restore the correct information, it is necessary to understand which changes the information has undergone in the transmission process, so a reference signal (RS) is introduced. The sending end and the receiving end agree on a known signal (RS) in advance, and the RS is transmitted together with the information to be sent in the transmission channel. After receiving the signal (RS'), the receiving end can understand the changes of the information in the transmission channel by comparing the difference between RS and RS', estimate the channel characteristics, and obtain the channel characteristics H. According to the channel characteristics H, the received information can be restored to the correct sent information.

[0136] Wherein, the demodulation reference signal (DMRS) is used for channel estimation during demodulation.

[0137] In LTE, NR and even future wireless communications, DMRS can be used for channel estimation when demodulating data in a physical downlink shared channel (PDSCH) / physical uplink shared channel (PUSCH). Among them, PDSCH is used to transmit downlink data, and PUSCH is used to transmit uplink data.

[0138] For convenience of description, the following takes DMRS symbols in PDSCH as an example for description. Among them, the DMRS symbol carries a DMRS sequence.

[0139] The time-frequency resources of the DMRS symbol are as follows:

[0140] Time domain resource: According to the number of DMRS occupied symbols, it is divided into single-symbol DMRS and double-symbol DMRS.

[0141] Frequency domain resource: According to the different maximum number of antenna ports (port) supported, the DMRS configuration mode can be divided into the following two categories:

[0142] DMRS configuration type 1 (or type 1, DMRS configuration type 1): It is comb-shaped in the frequency domain and is divided into two code division multiplexing (CDM) groups (CDM group), and code division multiplexing is used between ports in the group.

[0143] Type1 single-symbol DMRS: Maximum support of 4 antenna ports, divided into {1000, 1001} and {1002, 1003} two CDM groups, as shown in FIG. 5A.

[0144] Tpye1 double-symbol DMRS: Maximum support of 8 antenna ports, divided into {1000, 1001, 1004, 1005} and {1002, 1003, 1006, 1007} two CDM groups, as shown in FIG. 5B.

[0145] As shown in FIGS. 5A-5B, in Type 1, in the time direction, one slot contains 14 symbols, corresponding to indexes 0-13, under normal CP. In the frequency direction, one resource block (RB) contains 12 subcarriers, corresponding to indexes 0-11. One resource element (RE) corresponds to one symbol in the time direction and one subcarrier in the frequency direction. One antenna port has 6 REs in one RB for transmitting pilots. It can be understood that the "pilot" here can be "DMRS". In the time-frequency resource grid corresponding to one symbol and one RB, the first CDM group occupies even-indexed subcarriers, i.e., subcarrier indexes 0, 2, 4, 6, 8, and 10. The second CDM group occupies odd-indexed subcarriers, i.e., subcarrier indexes 1, 3, 5, 7, 9, and 11.

[0146] DMRS configuration type 2 (or type 2 DMRS configuration): divided into three CDM groups, and code division multiplexing is used between ports in the group. Compared with Type 1, Type 2 reduces the frequency domain density of DMRS. At this time, one antenna port has 4 REs in one RB for transmitting pilots.

[0147] Similarly, in Type 2, it is also divided into single-symbol and double-symbol DMRS.

[0148] Type 2 single-symbol DMRS: a maximum of 6 antenna ports are supported, divided into {1000, 1001}, {1002, 1003}, and {1004, 1005} three CDM groups, as shown in FIG. 5C.

[0149] Type 2 double-symbol DMRS: a maximum of 12 antenna ports are supported, divided into {1000, 1001, 1006, 1007}, {1002, 1003, 1008, 1009}, and {1004, 1005, 1010, 1011} three CDM groups, as shown in FIG. 5D.

[0150] As shown in FIGS. 5C-5D, in Type 2, in the time direction, one slot contains 14 symbols under normal CP, corresponding to indexes 0-13. In the frequency direction, one resource block (RB) contains 12 subcarriers, corresponding to indexes 0-11. One resource element (RE) corresponds to one symbol in the time direction and one subcarrier in the frequency direction. One antenna port has 4 REs in one RB for transmitting pilots. It should be understood that the term "pilot" can be replaced by "DMRS"; in the time-frequency resource grid corresponding to one symbol and one RB, the first CDM group occupies subcarriers with indexes 0, 1, 6, 7, the second CDM group occupies subcarriers with indexes 2, 3, 8, 9, and the third CDM group occupies subcarriers with indexes 4, 5, 10, 11.

[0151] It can be understood that in the NR system, DMRS signals can be divided into front-loaded DMRS and additional DMRS according to position. The front-loaded DMRS must exist, and the additional DMRS can not be configured. The additional DMRS is generally used in a high-speed mobile scenario to improve the estimation accuracy of a time-varying channel by inserting more DMRS symbols in the PDSCH. A maximum of 3 additional DMRS can be configured in one PDSCH.

[0152] The DMRS time-domain structure of mapping type A (or type A): the first DMRS symbol is located in symbol #2 or symbol #3 in the slot. Mapping type A is mainly used in scenarios in which data transmission occupies most of the symbols in the slot.

[0153] The DMRS time-domain structure of mapping type B (or type B): the first DMRS symbol is fixedly mapped in the first OFDM symbol of the PDSCH. Mapping type B is mainly used in scenarios in which the PDSCH occupies only a small part of the symbols in one slot to reduce transmission delay.

[0154] As can be seen from the above description of the DMRS, for a single CDM group or a single port carrying a DMRS symbol, whether it is Type 1 or Type 2, the DMRS symbol only occupies part of the subcarriers in one RB, for example, for type 1, port 1000 only occupies subcarriers 0, 2, 4, 6, 8, 10. Obviously, for those subcarriers in the RB that are not mapped into DMRS, whether they can be used for other purposes is the focus of the discussion.

[0155] To this end, the number of DMRS CDM groups without data is defined in NR to describe whether the remaining subcarriers of one RB (which do not carry DMRS sequences) carry data or are empty, thereby indicating whether the DMRS sequences in the DMRS symbol can be frequency division multiplexed with data, as shown in Table 3.

[0156] Table 3

[0157] As shown in Table 3, when the number of DMRS CDM groups without data (i.e., DMRS CDM groups whose REs cannot be used to carry data) is 1:

[0158] If the DMRS configuration mode is Type 1, it is agreed by the protocol that the REs in CDM group 0 cannot be used to carry data, therefore, when the antenna port number belongs to CDM group 0, the REs in CDM group 1 can be used to carry data, otherwise (e.g., when the antenna port number belongs to CDM group 1), the REs in CDM group 1 cannot carry data. As shown in FIG. 6A, consider the antenna port 1000, which belongs to CDM group 0 (the REs in this CDM group cannot be used to carry data), thus the REs in CDM group 1, i.e., subcarriers 1 / 3 / 5 / 7 / 9 / 11, can be used to carry data.

[0159] If the DMRS configuration mode is Type 2, it is agreed by the protocol that the REs in CDM group 0 cannot be used to carry data, therefore, if the antenna port number belongs to CDM group 0, the REs in CDM groups 1 and 2 can be used to carry data; if the antenna port number belongs to CDM group 1, the REs in CDM group 2 can be used to carry data; if the antenna port number belongs to CDM group 2, the REs in CDM group 1 can be used to carry data.

[0160] When the number of DMRS CDM groups without data (i.e., DMRS CDM groups whose REs cannot be used to carry data) is 2:

[0161] If the DMRS configuration mode is Type 1, the REs in CDM group 0 and CDM group 1 cannot be used to carry data, as shown in FIG. 6B, in which case the DMRS symbol does not carry data.

[0162] If the DMRS configuration mode is Type 2, it is agreed that the REs in CDM group 0 and 1 cannot be used to carry data, and the REs in CDM group 2 can be used to carry data if the antenna port number belongs to CDM group 2; otherwise, the REs in CDM group cannot be used to carry data (for example, when the antenna port number belongs to CDM group 2, the REs in CDM group 0 and 1 cannot be used to carry data).

[0163] When the number of DMRS CDM groups without data (i.e., the DMRS CDM groups whose REs cannot be used to carry data) is 3:

[0164] If the DMRS configuration mode is Type 1, it cannot be performed.

[0165] If the DMRS configuration mode is Type 2, CDM group 0, CDM group 1, and CDM group 2 cannot be used to carry data.

[0166] It can be seen that in NR, the DMRS sequence in the DMRS symbol is allowed to be FDM with data, thereby improving the resource utilization.

[0167] In addition, in NR, PUSCH supports two waveforms: OFDM waveform and DFT-s-OFDM waveform. PDSCH only supports OFDM waveform. Among them, DFT-s-OFDM waveform has lower peak to average power ratio (PAPR) compared with OFDM waveform, and thus has higher transmission power, which is suitable for coverage-limited scenarios, such as communication between cell edge users and base stations. Exemplarily, in future communication, PDSCH may also support DFT-s-OFDM waveform.

[0168] The relationship between the number of DMRS CDM groups without data and the waveform under a given DMRS type is shown in Table 4.

[0169] Table 4

[0170] It can be seen that in NR, when DFT-s-OFDM waveform is adopted, data is not supported in the DMRS symbol.

[0171] To this end, in order to better support future wireless communication and improve communication performance, the prior art proposes a scheme of frequency division multiplexing (FDM) of DMRS sequences and single carrier data (i.e., DFT results of subcarriers carrying QPSK / QAM symbol sequences), as shown in FIG. 7. After time domain data is spread by DFT, frequency domain data is obtained, and then frequency division multiplexing (FDM) is performed with DMRS sequences. Finally, after fast Fourier transform (IFFT), the signal is transmitted.

[0172] However, the current scheme does not indicate how to frequency division multiplex DMRS sequences and single carrier data. In the absence of indication, even if the current device successfully frequency division multiplexes DMRS sequences and single carrier data, the receiving device cannot know, so it cannot correctly process the signal.

[0173] To this end, the present application proposes a method for indicating frequency division multiplexing of DMRS sequences and single carrier data to enable frequency division multiplexing of DMRS sequences and single carrier data. It can be understood that, for ease of description, the first device is taken as the receiving end and the second device is taken as the transmitting end for illustration. In practice, the first device can be a transmitting end or a receiving end, and the second device can be a transmitting end or a receiving end.

[0174] In a first aspect, the present application provides a data indication method, which is used for a first device and includes:

[0175] Obtaining control information, which is used to indicate frequency division multiplexing (FDM) of DMRS sequences in a demodulation reference signal (DMRS) symbol and first data in the DMRS symbol, wherein the first data is single carrier data.

[0176] Exemplarily, the control information can include, but is not limited to, downlink control information (DCI), sidelink control information (SCI), and the like. It can be understood that when the control information is DCI, the first device can be a user equipment (e.g., a terminal), which obtains the DCI from a network device (e.g., a base station). When the control information is SCI, the first device can be a user equipment (e.g., a terminal, a vehicle, etc.), which obtains the control information from another user equipment.

[0177] In a possible implementation, the control information used to indicate frequency division multiplexing (FDM) of DMRS sequences in a DMRS symbol and first data in the DMRS symbol can include: a first field in the control information indicating that the conversion precoding state is turned on; and a second field in the control information indicating frequency division multiplexing (FDM) of the DMRS sequences and the first data.

[0178] For example, the first device can determine, based on the first field in the control information, that the current precoding state is enable or disable, and determine, in response to the current precoding state being enable, whether the DMRS sequence is frequency-division multiplexed with the first data based on the second field in the control information. It can be understood that when the first device determines, based on the first field, that the current precoding state is disable, it is not necessary to process the second field or determine, based on the second field, whether the DMRS sequence is frequency-division multiplexed with the first data, so as to avoid unnecessary processing overhead.

[0179] For example, the first field includes a transform precoding indication.

[0180] For example, when the control information is DCI, the first field in the control information can be a transform precoding indication. For example, a new field named “Transform precoding Indicator” is introduced in 3GPP Release 18 DCI format 0_1 / 0_2. The following specifically introduces the “Transform precoding Indicator” field in DCI format 0_1. Specifically, if the higher layer parameter dynamicTransformPrecoderInductionDCI-0-1 is configured as “enable” and the DCI format 0_1 is scrambled with a cell radio network temporary identifier (RNTI) or a MCS cell radio network temporary identifier or a configured scheduling RNTI, a 1-bit is used to indicate the field, where a bit value of 0 indicates that the transform precoding state is enable, and a bit value of 1 indicates that the transform precoding state is disable; otherwise, the field is configured as 0-bit. It can be understood that when the transform precoding state is enable, it indicates that the currently used waveform is a single carrier waveform (for example, a DFT-S-OFDM waveform), and when the transform precoding state is disable, it indicates that the currently used waveform is an OFDM waveform. Therefore, it can be determined, based on the transform precoding indication, whether the currently used waveform is a single carrier waveform. It can be understood that the fields capable of indicating whether the first data uses a single carrier waveform can all be used as the first field, and the transform precoding indication is only one possible implementation of the first field.

[0181] It can be understood that a corresponding field (for example, the first field) can also be defined in the control information such as SCI to indicate whether a single carrier waveform is used.

[0182] In a possible implementation, the first field and the second field are independent fields in the control information, and the control information format is shown in FIG. 8A, where the control information includes the first field and the second field. It can be understood that the first field and the second field can be connected or spaced, and the positions of the first field and the second field in the control information can be arbitrary. For example, when the control information is DCI, the first field is the transform precoding indication, and the second field is the DMRS and data FDM indication.

[0183] Exemplarily, the second field includes the DMRS and data FDM indication.

[0184] For example, the second field is the DMRS and data FDM indication (Data and Dmrs Fdm Indicator). Specifically, if the high-layer parameter dynamicTransformPrecoderIndicationDCI-x (x includes 0-1, 0-2, 0-3, 1-1 or 1-2) is configured as “enabled”, and the high-layer parameter DataDmrsFdmIndication is configured as “enabled”, the second field is indicated by using 1-bit bit, where the bit value 0 indicates that the first data and DMRS sequence are FDM, and the bit value 1 indicates that the first data and DMRS sequence cannot be FDM; otherwise, the second field is configured as 0 bits. In addition, the length of the DMRS and data FDM indication can be 1 bit or 0 bits, which affects the DCI length. Therefore, when the length of the DMRS and data FDM indication is 0 bits, the DCI length can be aligned with the DCI length when the DMRS and data FDM indication is 1 bit by filling 1 0 in the DCI MSB (most significant bits).

[0185] It should be understood that the field indicating whether the DMRS sequence and the first data are frequency division multiplexed (FDM) can be the second field, and the DMRS and data FDM indication is only one possible implementation of the second field.

[0186] Exemplarily, the first field and the second field are indicated by n-bit bits, where n is a positive integer.

[0187] For example, for the first field, it is indicated by 1-bit, 0 indicates single carrier waveform, 1 indicates non-single carrier waveform; or it is indicated by 2-bit, 00 indicates single carrier waveform, 01 indicates non-single carrier waveform. For the second field, it is indicated by 1-bit, when the indication bit is 0, it indicates that the DMRS sequence and the first data are FDM, when the indication bit is 1, it indicates that the DMRS sequence and the first data are not FDM; or, it is indicated by 2-bit, when the indication bit is 00, it indicates that the DMRS sequence and the first data are FDM, when the indication bit is 01, it indicates that the DMRS sequence and the first data are not FDM.

[0188] It can be understood that the single carrier data is data using single carrier signal. Exemplarily, the single carrier waveform includes DFT-S-OFDM.

[0189] Exemplarily, the DMRS sequence can use Zadoff-Chu sequence, and / or the first data can be obtained by DFT on the data.

[0190] It can be understood that the DMRS sequence can also use other low PAPR sequences, and the first data can also be obtained in other ways. The above examples are only illustrative and do not limit the scheme in the present application.

[0191] It can be understood that the first data in the present application represents frequency-division data, and the second data represents non-frequency-division data. The frequency-division data refers to the data in the DMRS symbol, which is FDM (frequency division multiplexing) with the DMRS sequence. The non-frequency-division data refers to the data in the data symbol. The DMRS symbol and the data symbol are located in different time domain positions.

[0192] For example, as shown in FIG. 6A, the DMRS symbol includes a symbol with index 2 and 12 REs on subcarriers with indexes 0-11, wherein the DMRS sequence is mapped to the REs on the symbol with index 2 and subcarriers with indexes 0, 2, 4, 6, 8, 10, and the data (i.e. the first data) in the DMRS symbol is mapped to the REs on the symbol with index 2 and subcarriers with indexes 1, 3, 5, 7, 9, 11. Obviously, the data in the DMRS symbol is FDM with the DMRS sequence. The data (second data) in the data symbol is mapped to the REs with symbol indexes 0-1, 3-13 and subcarrier indexes 0-11.

[0193] It can be understood that the first data can be data on a PDSCH or data on a PUSCH; for example, when the first device performs downlink communication to the second device, the first data can be data on a PDSCH, for example, the first device is a base station, the second device is a terminal, and the first device transmits information to the second device through a PDSCH; when the first device performs uplink communication to the second device, the first data can be data on a PUSCH, for example, the first device is a terminal, the second device is a base station, and the first device transmits information to the second device through a PUSCH.

[0194] Obviously, the above implementation needs two steps to complete the indication of FDM of single-carrier data and DMRS sequences, that is, first judging the waveform based on the first field, and then judging whether to use FDM based on the second field.

[0195] In another possible implementation, the indication of FDM of single-carrier data and DMRS sequences can be implemented in one step. Specifically, the control information is used to indicate that the DMRS sequence in the DMRS symbol is FDM with the first data in the DMRS symbol, and the control information format is as shown in FIG. 8B.

[0196] The third field in the control information indicates that the transform precoding state is enabled and the DMRS sequence is FDM with the first data; and the control information format is as shown in FIG. 8B.

[0197] For example, the original field “Transform precoder indicator” in the DCI can be deleted, and a third field (for example, a “waveform indicator” field) of, for example, two bits can be added, wherein one bit in the field indicates that the transform domain precoding state is enabled or disabled (for example, “0” indicates disabled, and “1” indicates enabled), and the other bit indicates whether the DMRS sequence is FDM with the first data (for example, “0” indicates disabled, and “1” indicates enabled). For example, the bit field and its corresponding function are as shown in Table 5. For example, when the third field is 11, the corresponding index value is 3, and the function corresponding to the index value is explained as that the transform precoding state is enabled and FDM is used; when the third field is 01, the corresponding index value is 1, and the function corresponding to the index value is explained as that the transform precoding state is disabled and FDM is used. Obviously, only when the bit corresponding to the third field is 11, can FDM of single-carrier data and DMRS sequences be enabled (that is, the transform domain precoding state is enabled and FDM is used).

[0198] Table 5

[0199] It can be understood that the third field of two bits is only an example to facilitate the better understanding of the scheme by those skilled in the art, and the actual third field can also be other number of bits, such as 3 bits, 4 bits, 6 bits, 8 bits, etc. In addition, it can be understood that the mapping of functions and index values in Table 5 is also not unique, and the case listed in the above Table 5 is only an exemplary description.

[0200] Exemplarily, the third field is indicated by n-bit, and n is a positive integer.

[0201] In another possible implementation, the control information is used to indicate that the DMRS sequence in the DMRS symbol is frequency division multiplexed (FDM) with the first data in the DMRS symbol, and the DMRS sequence in the DMRS symbol is frequency division multiplexed (FDM) with the second data in the DMRS symbol.

[0202] The fourth field in the control information indicates a first index value; a value of a number of DMRS CDM groups without data corresponding to the first index value is less than a value of the number of DMRS CDM groups; the DMRS sequence is frequency division multiplexed (FDM) with the first data corresponding to the value of the number of DMRS CDM groups without data corresponding to the first index value being less than the value of the number of DMRS CDM groups; and a conversion precoding state corresponding to the first data is enabled.

[0203] The control information format is shown in FIG. 8C.

[0204] It can be understood that the conversion precoding state can be indicated by a precoding indication (transform precoder indicator), which includes two states of enable and disable. When the conversion precoding state is enable, it indicates that the currently adopted waveform is a single carrier waveform (such as a DFT-S-OFDM waveform), and when the conversion precoding state is disable, it indicates that the currently adopted waveform is an OFDM waveform. The precoding indication can be obtained through DCI.

[0205] Exemplarily, the above implementation further includes obtaining first information, the first information being used to indicate a first correspondence relationship, the first correspondence relationship including a correspondence relationship between a plurality of index values and values of a number of DMRS CDM groups without data; and the first index value is one of the plurality of index values.

[0206] In a possible implementation, the first information further includes any one or more of the following: a conversion precoding state, a modulation coding scheme (MCS), a DMRS configuration type, a DMRS sequence type, a DMRS maximum length (maxLength), and a rank.

[0207] It can be understood that the modulation and coding scheme (MCS) includes but is not limited to pi / 2-BPSK / QPSK / 16QAM / 64QAM. The DMRS configuration type includes but is not limited to type1 or type2. The DMRS sequence type includes low PAPR generated sequence type 1 and low PAPR generated sequence type 2. Among them, the low PAPR generated sequence type 1 includes a ZC sequence, and the low PAPR generated sequence type 2 includes a pi / 2-BPSK sequence. The DMRS maximum length (maxLength) includes 1 or 2; when the DMRS maximum length is 2, the number of front-load symbols can be 1 or 2; when the DMRS maximum length is 1, the number of front-load symbols is 1.

[0208] When the DMRS sequence type includes a pi / 2-BPSK sequence, the first information further includes information indicating whether the pi / 2-BPSK sequence is configured with a transform precoding.

[0209] In a possible implementation, the first correspondence further includes any one or more of the following: a DMRS port value, a number of front-load symbols. Among them, the number of front-load symbols does not exceed the DMRS maximum length in the first information.

[0210] For example, the network device (for example, the second device) can indicate whether the single carrier data is FDM with the DMRS sequence through the number of DMRS CDM groups without data and the port number (DMRS port(s)). In a possible implementation, the two parties can define the correspondence between a plurality of index values and the number of DMRS CDM groups without data in advance, for example, through a form of some tables (for example, Table 7.3.1.1.2-6, Table 7.3.1.1.2-6A, Table 7.3.1.1.2-7, Table 7.3.1.1.2-7A agreed in “3GPP TS 38.212 version 18.3.0 Release 18”), one column of the table indicates the number of DMRS CDM groups without data, and the other column indicates the port number (DMRS port(s)). The user equipment (for example, the first device) can determine which table to query based on the first information. It can be understood that the above correspondence can be in the form of a table, or in other forms, which are not limited.

[0211] Exemplarily, when the transform precoding state is enabled, the DMRS configuration type is type 1 (dmrs-Type = 1), the DMRS maximum length is 1 (maxLength = 1), and the DMRS sequence is a low PAPR generated sequence type 1, it is determined to query in Table 6. Among them, the index values 6-7 in the table correspond to reserved bits.

[0212] Table 6

[0213] When the transform precoding state is enabled, the DMRS configuration type is type 1 (dmrs-Type = 1), the DMRS maximum length is 1 (maxLength = 1), the first data is determined to use pi / 2-BPSK modulation based on MCS, the DMRS sequence uses pi / 2-BPSK sequence, and the transform precoding is configured, it is determined to query in Table 6A. Among them, the index values 6-7 in the table correspond to reserved bits.

[0214] Table 6A

[0215] When the transform precoding state is enabled, the DMRS configuration type is type 1 (dmrs-Type = 1), the DMRS maximum length is 2 (maxLength = 2), and the DMRS sequence is a low PAPR generated sequence type 1, it is determined to query in Table 7. Among them, the index values 18-31 in the table correspond to reserved bits.

[0216] Table 7

[0217] When the transform precoding state is enabled, the DMRS configuration type is type 1 (dmrs-Type = 1), the DMRS maximum length is 2 (maxLength = 2), the first data is determined to use pi / 2-BPSK modulation based on MCS, the DMRS sequence uses pi / 2-BPSK sequence, and the transform precoding is configured, it is determined to query in Table 7A.

[0218] Table 7A

[0219] When the transform precoding state is enabled, the DMRS configuration type is type 2 (dmrs-Type = 2), the DMRS maximum length is 1 (maxLength = 1), the rank is 1 (rank = 1), and the DMRS sequence is a low PAPR generated sequence type 1, it is determined that a query is made in Table 8. In the table, the index values 12-15 correspond to reserved bits.

[0220] Table 8

[0221] When the transform precoding state is enabled, the DMRS configuration type is type 2 (dmrs-Type = 2), the DMRS maximum length is 1 (maxLength = 1), the rank is 2 (rank = 2), and the DMRS sequence is a low PAPR generated sequence type 1, it is determined that a query is made in Table 9. In the table, the index values 7-15 correspond to reserved bits.

[0222] Table 9

[0223] Exemplarily, the network device (e.g., the second device) can instruct the user equipment (e.g., the first device) to query the number of data-free DMRS CDM groups and the port number in the designated row in the table. For example, the network device (e.g., the second device) indicates the index value (Value) through the antenna port field (Antenna port(s)) in the downlink control information DCI. For example, the antenna port field is 3 bits, which can indicate the index range 0-7 (e.g., Table 6, Table 6A); the antenna port field is 4 bits, which can indicate the index value range 0-15 (e.g., Table 7A).

[0224] Exemplarily, when it is determined that a query is made in Table 6, if the obtained index value is 4, it is determined in Table 6 that the number of corresponding data-free DMRS CDM groups = 1, and the actual sending port number is 1000+0 = 1000 (port 1000).

[0225] Exemplarily, when it is determined that a query is made in Table 6A, if the obtained index value is 5, it is determined in Table 6A that the number of corresponding data-free DMRS CDM groups = 1, and the actual sending port number is 1000+0 = 1000 (port 1000) (scrambling identification n SCID = 1).

[0226] Exemplarily, when it is determined to query in Table 7, if the obtained index value is 17, it is determined in Table 7 that the number of corresponding DMRS CDM groups without data = 1, the corresponding actual sending port number is 1000+5 = 1005 (port 1005), and the corresponding front DMRS symbol number is 2.

[0227] Exemplarily, when it is determined to query in Table 7A, if the obtained index value is 14, it is determined in Table 7A that the number of corresponding DMRS CDM groups without data = 1, the corresponding actual sending port number is 1000+4 = 1004 (port 1004) (scrambling identification n SCID = 0), and the corresponding front DMRS symbol number is 2.

[0228] Exemplarily, when it is determined to query in Table 8, if the obtained index value is 5, it is determined in Table 8 that the number of corresponding DMRS CDM groups without data = 2, the corresponding actual sending port number is 1000+3 = 1003 (port 1003).

[0229] Exemplarily, when it is determined to query in Table 9, if the obtained index value is 2, it is determined in Table 9 that the number of corresponding DMRS CDM groups without data = 2, the corresponding actual sending port number is 1000+2 = 1002 (port 1002) and 1000+3 = 1003 (port 1003).

[0230] In a possible implementation, the fourth field includes an Antenna port(s) field.

[0231] In a possible implementation, the fourth field is indicated by n bits, where n is a positive integer.

[0232] Exemplarily, the network device (for example, the second device) can inform the user equipment (for example, the first device) of the index value through an “antenna ports” field (a bit sequence) in the downlink control information (DCI), so that the user equipment can obtain information indicating whether the DMRS sequence and the first data can be FDM based on the index value in the determined corresponding relationship (for example, a table). Exemplarily, the “antenna ports” field is a 2-bit sequence, “00” indicates that the index value is 0, “01” indicates that the index value is 1, “10” indicates that the index value is 2, and “11” indicates that the index value is 3, so the 2-bit “antenna ports” field can indicate that the index value ranges from 0 to 3.

[0233] It can be understood that, in the present application, the first device can first determine the first correspondence and then obtain the index value, or first obtain the index value and then determine the first correspondence, or simultaneously determine the first correspondence and the index value.

[0234] Exemplarily, when the value of the number of DMRS CDM groups without data corresponding to the first index value is less than the value of the number of DMRS CDM groups, it indicates that the DMRS sequence is frequency division multiplexed with the first data; or, when the value of the number of DMRS CDM groups without data corresponding to the first index value is equal to the value of the number of DMRS CDM groups, it indicates that the DMRS symbol does not carry data.

[0235] Exemplarily, the corresponding DMRS configuration type in Table 6\6A\7\7A is type1, that is, the DMRS includes 2 CDM groups, if the number of DMRS CDM groups without data corresponding to the index value is less than 2 (for example, 1), then the DMRS sequence is frequency division multiplexed with the first data FDM.

[0236] For example,

[0237] When it is determined to query in Table 7A (the corresponding DMRS configuration type is type1, that is, the DMRS includes 2 CDM groups), if the obtained index value is 14, it is determined in Table 7A that the number of DMRS CDM groups without data corresponding to the index value is 1, and since the number of DMRS CDM groups without data corresponding to the index value (1) is less than the number of DMRS CDM groups (2), the remaining REs except for the REs occupied by port 1004 can be used to carry data, that is, the DMRS sequence is frequency division multiplexed with the first data FDM.

[0238] When it is determined to query in Table 8 (the corresponding DMRS configuration type is type2, that is, the DMRS includes 3 CDM groups), if the obtained index value is 9, it is determined in Table 8 that the number of DMRS CDM groups without data corresponding to the index value is 3, and since the number of DMRS CDM groups without data corresponding to the index value (3) is equal to the number of DMRS CDM groups (3), the remaining REs except for the REs of port 1003 are vacant, that is, the DMRS symbol does not carry data.

[0239] It can be understood that, in the case of determining the number of DMRS CDM groups without data, the number of CDM groups, the scheduled port, etc., the determination of whether the DMRS symbol carries data or the determination of how the DMRS sequence is frequency division multiplexed with the first data in the case of carrying data can refer to Table 3.

[0240] In a possible implementation, the single carrier waveform includes DFT-S-OFDM.

[0241] The data transmission method in the present application is described above from the first device side (i.e., the sending end). The corresponding method of the second device side (i.e., the receiving end) is described below. It can be understood that the corresponding method suitable for the sending end in the present application is also suitable for the receiving end, or for those skilled in the art, only a simple adjustment of the corresponding method of the sending end can be realized in the receiving end, so the same part is not described again. At the same time, it can be understood that the first device in the present application can be the sending end, and the second device can be the receiving end. Correspondingly, the second device can be the sending end, and the second device can be the receiving end. The present application only takes the first device as the sending end and the second device as the receiving end as an example for description.

[0242] In a second aspect, the present application provides a data indication method, which is applied to a second device, comprising:

[0243] Outputting control information, the control information being used to indicate that a DMRS sequence in a DMRS symbol is frequency division multiplexed (FDM) with first data in the DMRS symbol, the first data being single-carrier data.

[0244] In the above embodiments of the present application, the methods provided by the embodiments of the present application are introduced from the perspectives of the first device and the second device, respectively. In order to realize the functions in the methods provided by the embodiments of the present application, the terminal or the access network device, the server, the core network device, etc. can include hardware structures and / or software modules to realize the above-mentioned functions in the form of hardware structures, software modules, or hardware structures plus software modules. Whether a certain function in the above-mentioned functions is executed in the form of hardware structure, software module, or hardware structure plus software module depends on the design constraint conditions of the specific application of the technical solution.

[0245] To this end, in a third aspect, the present application provides a possible structure of a communication device, as shown in FIG. 9. These communication devices can realize one or more corresponding functions in the above-mentioned method embodiments. For example, the functions realized by the first communication device or the second communication device, etc. Therefore, the beneficial effects possessed by the above-mentioned method embodiments can be realized. In the embodiments of the present application, the communication device can be a terminal or an access network device, or the communication device can be a module (such as a chip) applied to a terminal or an access network device.

[0246] As shown in FIG. 9, the communication device includes a processing unit 910 and a transceiver unit 920. The communication device 900 is used to realize the functions of the first device in the above-mentioned first aspect or the second device in the second aspect. Optionally, the transceiver unit 920 can also be called an output unit, an interface unit, or a communication unit, etc. In a possible implementation manner, the transceiver unit 920 includes at least one of a sending unit or a receiving unit. The sending unit and the receiving unit can be integrated together, or be two independent units, etc.

[0247] When the communication apparatus 900 is configured to function as the first device in the first aspect, specifically:

[0248] The transceiver 920: obtains control information, the control information being used to indicate that a demodulation reference signal, DMRS, sequence in a DMRS symbol is frequency division multiplexed, FDMed, with first data in the DMRS symbol, the first data being single carrier data.

[0249] The processing unit 910: determines, based on the control information, that the DMRS sequence is FDMed with the first data.

[0250] In a possible implementation, the control information being used to indicate that the DMRS sequence in the DMRS symbol is FDMed with the first data in the DMRS symbol specifically includes:

[0251] A first field in the control information indicates that a transform precoding state is turned on.

[0252] A second field in the control information indicates that the DMRS sequence is FDMed with the first data.

[0253] In a possible implementation, the first field includes a transform precoder indicator.

[0254] In a possible implementation, the second field includes a DMRS and data FDM indicator.

[0255] In a possible implementation, the first field and the second field are indicated by n bits, n being a positive integer.

[0256] In a possible implementation, the control information being used to indicate that the DMRS sequence in the DMRS symbol is FDMed with the first data in the DMRS symbol specifically includes:

[0257] A third field in the control information indicates that a transform precoding state is turned on and the DMRS sequence is FDMed with the first data.

[0258] In a possible implementation, the third field is indicated by n bits, n being a positive integer.

[0259] In a possible implementation, the control information being used to indicate that the DMRS sequence in the DMRS symbol is FDMed with the first data in the DMRS symbol specifically includes:

[0260] The fourth field in the control information indicates a first index value; a value of a number of data-free DMRS CDM groups corresponding to the first index value is less than a value of a number of DMRS CDM groups; the DMRS sequence is FDMed with the first data corresponding to the value of the number of data-free DMRS CDM groups corresponding to the first index value being less than the value of the number of DMRS CDM groups; and the first data corresponds to a turned-on precoding state.

[0261] In a possible implementation, the method further includes: obtaining first information, the first information being used to indicate a first correspondence relationship, the first correspondence relationship including a correspondence relationship between a plurality of index values and values of a number of data-free DMRS CDM groups; the first index value being one of the plurality of index values.

[0262] In a possible implementation, the first correspondence relationship further includes any one or more of the following: a DMRS port value, a number of front-loaded DMRS symbols.

[0263] In a possible implementation, the first information further includes any one or more of the following:

[0264] a turned-on precoding state, a modulation and coding scheme (MCS), a DMRS configuration type, a DMRS sequence type, a maximum length of a DMRS, and a rank.

[0265] In a possible implementation, the DMRS sequence type includes a low PAPR generated sequence type 1 and a low PAPR generated sequence type 2; the low PAPR generated sequence type 1 includes a ZC sequence, and the low PAPR generated sequence type 2 includes a pi / 2-BPSK sequence.

[0266] In a possible implementation, when the DMRS sequence type includes the pi / 2-BPSK sequence, the first information further includes information indicating whether the pi / 2-BPSK sequence is configured with a turned-on precoding.

[0267] In a possible implementation, the fourth field includes an antenna port field (antenna port(s)).

[0268] In a possible implementation, the fourth field is indicated by n bits, n being a positive integer.

[0269] When the communication apparatus 900 is used for the function of the second device in the second aspect, specifically:

[0270] The transceiver 920 outputs control information, where the control information is used to indicate that a DMRS sequence in a DMRS symbol is frequency division multiplexed (FDM) with first data in the DMRS symbol, and the first data is single carrier data.

[0271] In a possible implementation, the control information used to indicate that the DMRS sequence in the DMRS symbol is FDM with the first data in the DMRS symbol specifically includes:

[0272] A first field in the control information indicates that a transform precoding state is turned on.

[0273] A second field in the control information indicates that the DMRS sequence is FDM with the first data.

[0274] In a possible implementation, the first field includes a transform precoder indicator.

[0275] In a possible implementation, the second field includes a DMRS and data FDM indicator.

[0276] In a possible implementation, the first field and the second field are indicated by n bits, where n is a positive integer.

[0277] In a possible implementation, the control information used to indicate that the DMRS sequence in the DMRS symbol is FDM with the first data in the DMRS symbol specifically includes:

[0278] A third field in the control information indicates that a transform precoding state is turned on and the DMRS sequence is FDM with the first data.

[0279] In a possible implementation, the third field is indicated by n bits, where n is a positive integer.

[0280] In a possible implementation, the control information used to indicate that the DMRS sequence in the DMRS symbol is FDM with the first data in the DMRS symbol specifically includes:

[0281] A fourth field in the control information indicates a first index value, where a value of a number of DMRS CDM groups without data corresponding to the first index value is less than a value of the number of DMRS CDM groups, and where the DMRS sequence is FDM with the first data corresponding to the value of the number of DMRS CDM groups without data corresponding to the first index value being less than the value of the number of DMRS CDM groups, and where a transform precoding state corresponding to the first data is turned on.

[0282] In a possible implementation, the method further includes: outputting first information, the first information being used to indicate a first correspondence relationship, the first correspondence relationship including a correspondence relationship between a plurality of index values and a value of a number of DMRS CDM groups without data; the first index value is one of the plurality of index values.

[0283] In a possible implementation, the first correspondence relationship further includes any one or more of the following: a DMRS port value, a number of front-loaded DMRS symbols.

[0284] In a possible implementation, the first information further includes any one or more of the following:

[0285] A conversion precoding state, a modulation coding scheme (MCS), a DMRS configuration type, a DMRS sequence type, a maximum length of a DMRS, and a rank.

[0286] In a possible implementation, the DMRS sequence type includes a low PAPR generated sequence type 1 and a low PAPR generated sequence type 2; the low PAPR generated sequence type 1 includes a ZC sequence, and the low PAPR generated sequence type 2 includes a pi / 2-BPSK sequence.

[0287] In a possible implementation, when the DMRS sequence type includes a pi / 2-BPSK sequence, the first information further includes information indicating whether the pi / 2-BPSK sequence is configured to convert precoding.

[0288] In a possible implementation, the fourth field includes an antenna port field (antenna port(s)).

[0289] In a possible implementation, the fourth field is indicated by n bits, n being a positive integer.

[0290] For more details of the processing unit 910 and the transceiver unit 920, refer to the description in the first aspect or the second aspect, which will not be repeated here.

[0291] It can be understood that the division of units in the embodiments of the present application is illustrative, and is merely a logical function division. In actual implementation, another division manner can be used. In addition, each functional unit in the embodiments of the present application can be integrated in one physical device (for example, in a processor), or each functional unit can be a separate physical device, or two or more units can be integrated in one unit for implementation. The integrated unit can be implemented in the form of hardware, or in the form of a software functional module, etc.

[0292] Figure 10 shows another possible structure of a communication apparatus provided by the present application. As shown in Figure 10, the communication apparatus 1000 includes a processing circuit 1100 and an interface circuit 1200. The processing circuit 1100 and the interface circuit 1200 are coupled to each other. It can be understood that the processing circuit 1100 can be a processor, and the interface circuit 1200 can be a transceiver or an input / output interface.

[0293] Optionally, the communication apparatus 1000 can further include a memory 1300, configured to store instructions executed by the processing circuit 1100 or store input data required by the processing circuit 1100 to execute instructions or store data generated after the processing circuit 1100 executes instructions.

[0294] Optionally, the memory (e.g., 1300) in the embodiments of the present application can be integrated in the processing circuit (e.g., 1100), or the memory (e.g., 1300) and the processing circuit (e.g., 1100) can be separately arranged.

[0295] When the communication apparatus 1000 is used to implement the method shown in the first aspect or the second aspect, the processing circuit 1100 is configured to implement the functions of the processing unit 910, and the interface circuit 1200 is configured to implement the functions of the transceiving unit 920.

[0296] When the above communication apparatus is a chip applied to a terminal, the chip implements the functions of the terminal in the above method embodiments. The chip receives information sent by an access network device to the terminal through other modules (such as a radio frequency module or an antenna) in the terminal; or the chip sends information to other modules (such as a radio frequency module or an antenna) in the terminal, and the information is sent by the terminal to the access network device.

[0297] When the above communication apparatus is a module applied to an access network device, the module implements the functions of the access network device in the above method embodiments. The module receives information from other modules (such as a radio frequency module or an antenna) in the access network device, and the information is sent by a terminal to the access network device; or the module sends information to other modules (such as a radio frequency module or an antenna) in the access network device, and the information is sent by the access network device to the terminal.

[0298] It can be appreciated that the processor in the embodiments of the present application can be a central processing unit (CPU), and can also be other general-purpose processors, digital signal processors (DSP), application specific integrated circuits (ASIC), field programmable gate arrays (FPGA) or other programmable logic devices, transistor logic devices, hardware components or any combination thereof. The general-purpose processor can be a microprocessor or any conventional processor.

[0299] The memory in the embodiments of the present application can be a random access memory (RAM), a flash memory, a read-only memory (ROM), a programmable ROM (PROM), an erasable PROM (EPROM), an electrically EPROM (EEPROM), a register, a hard disk, a mobile hard disk, a CD-ROM, or any other form of storage medium well known in the art.

[0300] The method steps in the embodiments of the present application can be implemented in hardware, or in software instructions executable by a processor. The software instructions can be composed of corresponding software modules, which can be stored in a random access memory, a flash memory, a read-only memory, a programmable ROM, an erasable programmable ROM, an electrically EPROM, a register, a hard disk, a mobile hard disk, a CD-ROM, or any other form of storage medium well known in the art. An exemplary storage medium is coupled to the processor, so that the processor can read information from, and write information to, the storage medium. The storage medium can also be a component of the processor. The processor and the storage medium can be located in an ASIC.

[0301] The embodiments of the present application also provide a communication apparatus, which comprises a processor and a memory. The processor is configured to enable the functions of the first device in the first aspect and / or the second device in the second aspect to be implemented. For example, the processor is configured to execute a computer program or instructions stored in the memory, and the memory is configured to store the computer program or the instructions, which, when executed, enable the method of the first device in the first aspect and / or the second device in the second aspect to be performed. Optionally, the processor and the memory are coupled.

[0302] The embodiment of the present application further provides a communication device, comprising a processor, the processor being used for enabling the functions of the first device in the first aspect and / or the second device in the second aspect to be realized.

[0303] The embodiment of the present application further provides a computer readable storage medium, which stores instructions, the instructions can also be referred to as computer programs, computer program codes and the like. The instructions run on a computer, so that the functions of the first device in the first aspect and / or the second device in the second aspect in the above method embodiment are realized.

[0304] The embodiment of the present application further provides a computer program product, which comprises a computer program or instructions, the computer program product comprises the computer program or instructions used for executing the method of the first device in the first aspect, or the computer program product comprises the computer program or instructions used for executing the method of the second device in the second aspect.

[0305] The embodiment of the present application further provides a chip, which comprises a processor and a memory, the processor is coupled with the memory, and the processor is used for executing the computer program or instructions stored in the memory, so that the functions of the first device in the first aspect and / or the second device in the second aspect are realized.

[0306] The embodiment of the present application further provides a communication system, which comprises a first communication device and a second communication device. The first communication device is used for enabling the functions of the first device in the first aspect to be realized, and the second communication device is used for enabling the functions of the second device in the second aspect to be realized.

[0307] In the above embodiments, all or part of the embodiments can be implemented by software, hardware, firmware or any combination thereof. When implemented by software, all or part of the embodiments can be implemented in the form of a computer program product. The computer program product includes one or more computer programs or instructions. When the computer programs or instructions are loaded and executed on a computer, all or part of the processes or functions described in the embodiments are performed. The computer can be a general purpose computer, a special purpose computer, a computer network, a network device, a user equipment or other programmable apparatus. The computer programs or instructions can be stored in a computer readable storage medium or transferred from one computer readable storage medium to another computer readable storage medium, for example, the computer programs or instructions can be transferred from one website site, computer, server or data center to another website site, computer, server or data center through wired or wireless manner. The computer readable storage medium can be any available medium that can be accessed by a computer or a data storage device such as a server, data center and the like integrated with one or more available media. The available media can be a magnetic medium, such as a floppy disk, a hard disk, a magnetic tape; or an optical medium, such as a digital video disc; or a semiconductor medium, such as a solid state disk. The computer readable storage medium can be a volatile or non-volatile storage medium, or can include both volatile and non-volatile storage media.

[0308] In this application, "at least one" means one or more, and "multiple" means two or more. The association relationship between the associated objects is described by "and / or", which means that there can be three kinds of relationships, for example, A and / or B, which can represent the following cases: A exists alone, A and B exist together, B exists alone, where A and B can be singular or plural. In the textual description of this application, the character " / ", generally indicates that the front and rear associated objects are in an "or" relationship. "Including at least one of A, B and C" can mean: including A; including B; including C; including A and B; including A and C; including B and C; including A, B and C.

[0309] It can be understood that the various numerical numbers or writing sequences involved in the embodiments of the present application are only distinguished for the convenience of description, and are not used to limit the scope of the embodiments of the present application. The size or writing sequence of the serial numbers of the above processes does not mean the execution sequence, and the execution sequence of the processes should be determined according to its function and inherent logic.

[0310] In various embodiments of the present application, the terms and / or descriptions of different embodiments are consistent and can be mutually referred to if there is no special description and logical conflict. The technical features in different embodiments can be combined to form new embodiments according to their inherent logical relationship.

Claims

1. A data indication method, characterized in that, The method is used for a first device, comprising: obtaining control information, the control information being used for indicating that a DMRS sequence in a DMRS symbol is frequency division multiplexed (FDM) with first data in the DMRS symbol, the first data being single carrier data.

2. The method of claim 1, wherein, The control information being used for indicating that the DMRS sequence in the DMRS symbol is FDM with the first data in the DMRS symbol specifically comprises: a first field in the control information indicating that a transform precoding state is turned on; a second field in the control information indicating that the DMRS sequence is FDM with the first data.

3. The method of claim 2, wherein, The first field comprises a transform precoding indication.

4. The method according to any one of claims 2-3, wherein, The second field comprises a DMRS and data FDM indication.

5. The method according to any one of claims 2 to 4, wherein, The first field and the second field are indicated by n bits, n being a positive integer.

6. The method of claim 1, wherein, The control information being used for indicating that the DMRS sequence in the DMRS symbol is FDM with the first data in the DMRS symbol specifically comprises: a third field in the control information indicating that the transform precoding state is turned on and the DMRS sequence is FDM with the first data.

7. The method of claim 6, wherein, The third field is indicated by n bits, n being a positive integer.

8. The method of claim 1, wherein, The control information being used for indicating that the DMRS sequence in the DMRS symbol is FDM with the first data in the DMRS symbol specifically comprises: a fourth field in the control information indicating a first index value; a value of a number of DMRS CDM groups without data corresponding to the first index value being less than a value of the number of DMRS CDM groups; the DMRS sequence being FDM with the first data corresponding to the value of the number of DMRS CDM groups without data corresponding to the first index value being less than the value of the number of DMRS CDM groups. Wherein, a transform precoding state corresponding to the first data is turned on.

9. The method of claim 8, wherein, The method further comprises: obtaining first information, the first information being used for indicating a first correspondence relationship, the first correspondence relationship comprising a correspondence relationship between a plurality of index values and values of a number of DMRS CDM groups without data; the first index value being one of the plurality of index values.

10. The method of claim 9, wherein, The first correspondence relationship further comprises any one or more of the following: a DMRS port value, a number of front DMRS symbols.

11. The method according to any one of claims 9-10, wherein, The first information further comprises any one or more of the following: a transform precoding state, a modulation and coding scheme (MCS), a DMRS configuration type, a DMRS sequence type, a maximum length of a DMRS, a rank.

12. The method of claim 11, wherein, The DMRS sequence type comprises a low PAPR generated sequence type 1 and a low PAPR generated sequence type 2; wherein, the low PAPR generated sequence type 1 comprises a ZC sequence, and the low PAPR generated sequence type 2 comprises a pi / 2-BPSK sequence.

13. The method of any one of claims 11-12, wherein, When the DMRS sequence type comprises the pi / 2-BPSK sequence, the first information further comprises information indicating whether the pi / 2-BPSK sequence is configured with transform precoding.

14. The method according to any one of claims 8 to 13, wherein, The fourth field comprises an antenna port field.

15. The method according to any one of claims 8 to 14, wherein, The fourth field is indicated by n bits, n being a positive integer.

16. A data indication method, comprising: The method is used for a second device, comprising: Output control information, the control information is used for indicating that a DMRS sequence in a DMRS symbol is frequency division multiplexed (FDM) with first data in the DMRS symbol, and the first data is single carrier data.

17. The method of claim 16, wherein, The control information is used for indicating that a DMRS sequence in a DMRS symbol is frequency division multiplexed (FDM) with first data in the DMRS symbol, and the control information specifically comprises: A first field in the control information indicates that a transition precoding state is turned on. A second field in the control information indicates that the DMRS sequence is frequency division multiplexed (FDM) with the first data.

18. The method of claim 17, wherein, The first field comprises a transition precoding indication.

19. The method of any one of claims 17-18, wherein, The second field comprises a DMRS and data FDM indication.

20. The method of any one of claims 17-19, wherein, The first field and the second field are indicated by n-bit bits, and n is a positive integer.

21. The method of claim 16, wherein, The control information is used for indicating that a DMRS sequence in a DMRS symbol is frequency division multiplexed (FDM) with first data in the DMRS symbol, and the control information specifically comprises: A third field in the control information indicates that a transition precoding state is turned on and the DMRS sequence is frequency division multiplexed (FDM) with the first data.

22. The method of claim 21, wherein, The third field is indicated by n-bit bits, and n is a positive integer.

23. The method of claim 16, wherein, The control information is used for indicating that a DMRS sequence in a DMRS symbol is frequency division multiplexed (FDM) with first data in the DMRS symbol, and the control information specifically comprises: A fourth field in the control information indicates a first index value; a value of a number of DMRS CDM groups without data corresponding to the first index value is less than a value of a number of DMRS CDM groups; and the DMRS sequence is frequency division multiplexed (FDM) with the first data corresponding to the value of the number of DMRS CDM groups without data corresponding to the first index value being less than the value of the number of DMRS CDM groups. Wherein, a transition precoding state corresponding to the first data is turned on.

24. The method of claim 23, wherein, The method further comprises: outputting first information, the first information being used for indicating a first correspondence relationship, the first correspondence relationship comprising a correspondence relationship between a plurality of index values and values of a number of DMRS CDM groups without data; and the first index value being one of the plurality of index values.

25. The method of claim 24, wherein, The first correspondence relationship further comprises any one or more of the following: a DMRS port value, a number of front DMRS symbols.

26. The method of any one of claims 24-25, wherein, The first information further comprises any one or more of the following: A transition precoding state, a modulation and coding scheme (MCS), a DMRS configuration type, a DMRS sequence type, a maximum length of a DMRS, and a rank.

27. The method of claim 26, wherein, The DMRS sequence type comprises a low PAPR generated sequence type 1 and a low PAPR generated sequence type 2; wherein the low PAPR generated sequence type 1 comprises a ZC sequence, and the low PAPR generated sequence type 2 comprises a pi / 2-BPSK sequence.

28. The method of any one of claims 26-27, wherein, When the DMRS sequence type comprises a pi / 2-BPSK sequence, the first information further comprises information indicating whether the pi / 2-BPSK sequence is configured with transition precoding.

29. The method of any one of claims 23-28, wherein, The fourth field comprises an antenna port field.

30. The method of any one of claims 23-29, wherein, The fourth field is indicated by n-bit bits, and n is a positive integer.

31. A communications device, characterized by Comprise: A processor for executing a computer program or instructions; When the computer program or instructions are run, the method of any one of claims 1-15 is performed; or, the method of any one of claims 16-30 is performed.

32. The apparatus of claim 31, wherein, The apparatus further comprises a memory which stores the computer program or instructions.

33. A computer-readable storage medium, comprising: The computer readable storage medium stores computer programs or instructions which, when run, cause the method of any one of claims 1-15 to be performed; or, the method of any one of claims 16-30 to be performed.

34. A computer program product, characterised in that, The computer program product comprises computer programs or instructions for performing the method of any one of claims 1-15; or, comprises computer programs or instructions for performing the method of any one of claims 16-30.

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