Communication method, communication apparatus, and computer-readable storage medium

Abstract

Provided in the present application are a communication method, a communication apparatus, and a computer-readable storage medium. The method comprises: determining a subcarrier spacing of N first symbols, wherein the subcarrier spacing of each first symbol comprises any one of the following: 20·2φ kHz, 120 / 7·2φ kHz, 16·2φ kHz and 19.2·2φ kHz, where φ is a positive integer; and using the N first symbols to send or receive at least one of data and a reference signal. In the method provided in the present application, a subcarrier spacing of first symbols is determined as any one of the following: 20·2φ kHz, 120 / 7·2φ kHz, 16·2φ kHz and 19.2·2φ kHz, such that when a primary symbol is split into a plurality of sub-symbols, the implementation complexity of the generation or demodulation of the plurality of sub-symbols is ultimately reduced.

Description

Communication method, communication device and computer-readable storage medium Technical Field

[0001] The present application relates to the field of communication technology, and more specifically, to a communication method, a communication device, and a computer-readable storage medium. Background Art

[0002] In the LTE / LTE-Advanced (LTE-A) / NR systems defined by the 3rd Generation Partnership Project (3GPP), downlink multiple access typically uses orthogonal frequency division multiple access (OFDMA). Downlink resources are divided into multiple OFDM symbols in time (the time domain) and into multiple subcarriers in frequency (the frequency domain).

[0003] In one related art example, a reference signal can be sent across a complete CP-OFDM symbol to achieve channel tracking. However, this approach results in significant pilot overhead. To reduce pilot overhead, the subcarrier width of the CP-OFDM symbol can also be increased. However, increasing the subcarrier width of the CP-OFDM symbol can cause a large number of CP-OFDM symbols to be misaligned between multiple users, resulting in a loss of frequency orthogonality between multiple users and ultimately leading to demodulation failure at the receiving end.

[0004] In another related technology, a main symbol can be split into multiple sub-symbols to ensure that the CP-OFDM symbols between multiple users are aligned and the pilot overhead can be reduced. However, in this implementation, when the CP lengths of the main symbol and the sub-symbol are the same, the implementation complexity of sub-symbol generation or demodulation is high.

[0005] Summary of the Invention

[0006] The present application provides a communication method, a communication device, and a computer-readable storage medium, which solve the problem of high implementation complexity of sub-symbol generation or demodulation when a main symbol is split into multiple sub-symbols.

[0007] In the first aspect, a communication method is provided. The method provided in the first aspect can be executed by a network device, or by a terminal device, or by a chip configured in the network device, or by a chip configured in the terminal device. This application does not limit this.

[0008] Specifically, the method includes: determining the subcarrier spacing of N first symbols, where the subcarrier spacing of each first symbol includes any one of the following: 20·2 φ kHz, 16.2 φ kHz and 19.2·2 φ kHz, where φ is a positive integer; at least one of data and a reference signal is sent using N first symbols.

[0009] The method provided by the first aspect is to determine the subcarrier spacing of the first symbol to be any one of the following: 20·2 φ kHz, 16.2 φ kHz and 19.2·2 φ kHz, which ultimately reduces the implementation complexity of multiple sub-symbol generation or demodulation when the main symbol is split into multiple sub-symbols.

[0010] In a possible implementation of the first aspect, the total length of the N first symbols with the same subcarrier spacing is the same as the length of one second symbol.

[0011] In a possible implementation of the first aspect, N=2 n , n is a positive integer. This implementation method can make the length of the sub-symbol CP an integer.

[0012] In a possible implementation of the first aspect, the Fourier transform size of each of the N first symbols satisfies: A=2 α *3 β *5 γ *7 θ

[0013] Wherein, A represents the magnitude of the Fourier transform of the first symbol, and α, β, γ, and θ are non-negative integers.

[0014] In this implementation, when the Fourier transform size of each first symbol satisfies the above formula, the Fourier transform complexity of the generated sub-symbol is low.

[0015] In a possible implementation of the first aspect, a difference between a length of each first symbol excluding a cyclic prefix (CP) and a first value is less than or equal to a first threshold, and the first value satisfies the following calculation formula:

[0016] Wherein, B represents the first value, L D Indicates the length of the second symbol excluding CP, L CPrepresents the length of the second symbol CP, and N represents the number of first symbols. This implementation method can ensure that the Fourier transform size A of each first symbol satisfies the above formula when the length of the sub-symbol CP is similar to the length of the main symbol CP.

[0017] In a possible implementation of the first aspect, the first threshold is related to at least one of the subcarrier spacing of the second symbol and the number of the first symbols.

[0018] In a possible implementation manner of the first aspect, the length of each of the first symbols except for the CP is the same, and the CP length of each of the first symbols is the same.

[0019] In a possible implementation of the first aspect, the subcarrier spacing of the second symbol is 15·2 μ kHz, where μ=φ-n, and μ is a non-negative integer. In this implementation, the relationship between μ in the subcarrier width of the second symbol and the subcarrier spacing of the first symbol is μ=φ-n.

[0020] In a possible implementation of the first aspect, when the subcarrier spacing of each first symbol is 20·2 μ+n kHz, the length of each first symbol excluding the CP and the length of each first symbol CP are calculated according to the following formula: s,D =1536·κ 6G 2 -μ-n

[0021] Among them, L s,D Indicates the length of each first symbol excluding CP, L s,CP represents the length of each first symbol CP, l represents the position of the second symbol in a subframe, κ 6G =2 n1 , n1≥6, n1 is an integer.

[0022] In a possible implementation of the first aspect, when each first symbol subcarrier spacing is When the length of each first symbol excluding the CP and the length of each first symbol CP are calculated according to the following formula: L s ,D =1792·κ 6G 2 -μ-n

[0023] Among them, L s,D Indicates the length of each first symbol excluding CP, L s,CPrepresents the length of each first symbol CP, l represents the position of the second symbol in a subframe, κ 6G =2 n1 , n1≥6, n1 is an integer.

[0024] In a possible implementation of the first aspect, when the subcarrier spacing of each first symbol is 16·2 μ+n kHz, the length of each first symbol excluding the CP and the length of each first symbol CP are calculated according to the following formula: s,D =1920·κ 6G 2 -μ-n

[0025] Among them, L s,D Indicates the length of each first symbol excluding CP, L s,CP represents the length of each first symbol CP, l represents the position of the second symbol in a subframe, κ 6G =2 n1 , n1≥6, n1 is an integer.

[0026] In a possible implementation of the first aspect, when the subcarrier spacing of each first symbol is 19.2·2 μ+n kHz, the length of each first symbol excluding the CP and the length of each first symbol CP are calculated according to the following formula: s,D =1600·κ 6G 2 -μ-n

[0027] Among them, L s,D Indicates the length of each first symbol excluding CP, L s,CP represents the length of each first symbol CP, l represents the position of the second symbol in a subframe, κ 6G =2 n1 , n1≥6, n1 is an integer.

[0028] In a second aspect, a communication device is provided, the communication device comprising:

[0029] A processing unit, the processing unit is used to determine the subcarrier spacing of N first symbols, the subcarrier spacing of each first symbol including any one of the following: 20·2 φ kHz, 16.2 φ kHz and 19.2·2 φ kHz, where φ is a positive integer;

[0030] A transceiver unit is configured to send or receive at least one of data and a reference signal using the N first symbols.

[0031] The apparatus provided by the second aspect is configured to determine the subcarrier spacing of the first symbol to be any one of the following: 20·2 φ kHz, 16.2 φ kHz and 19.2·2 φ kHz, which ultimately reduces the implementation complexity of multiple sub-symbol generation or demodulation when the main symbol is split into multiple sub-symbols.

[0032] In a possible implementation of the second aspect, the total length of the N first symbols with the same subcarrier spacing is equal to the length of one second symbol.

[0033] In a possible implementation of the second aspect, N=2 n , n is a positive integer. This implementation method can make the length of the sub-symbol CP an integer.

[0034] In a possible implementation of the second aspect, the Fourier transform size of each of the N first symbols satisfies: A=2 α *3 β *5 γ *7 θ

[0035] Wherein, A represents the magnitude of the Fourier transform of the first symbol, and α, β, γ, and θ are non-negative integers.

[0036] In this implementation, when the Fourier transform size of each first symbol satisfies the above formula, the Fourier transform complexity of the generated sub-symbol is low.

[0037] In a possible implementation of the second aspect, a difference between a length of each first symbol excluding the cyclic prefix (CP) and the first value is less than or equal to a first threshold, and the first value satisfies the following calculation formula:

[0038] Wherein, B represents the first value, L D Indicates the length of the second symbol excluding CP, L CP represents the length of the second symbol CP, and N represents the number of first symbols. This implementation method can ensure that the Fourier transform size A of each first symbol satisfies the above formula when the length of the sub-symbol CP is similar to the length of the main symbol CP.

[0039] In a possible implementation manner of the second aspect, the first threshold is related to at least one of the subcarrier spacing of the second symbol and the number of the first symbols.

[0040] In a possible implementation manner of the second aspect, the length of each of the first symbols except for the CP is the same, and the CP length of each of the first symbols is the same.

[0041] In a possible implementation of the second aspect, the subcarrier spacing of the second symbol is 15·2 μ kHz, where μ=φ-n, and μ is a non-negative integer. In this implementation, the relationship between μ in the subcarrier width of the second symbol and the subcarrier spacing of the first symbol is μ=φ-n.

[0042] In a possible implementation of the second aspect, when the subcarrier spacing of each first symbol is 20·2 μ+n kHz, the length of each first symbol excluding the CP and the length of each first symbol CP are calculated according to the following formula: s,D =1536·κ 6G 2 -μ-n

[0043] Among them, L s,D Indicates the length of each first symbol excluding CP, L s,CP represents the length of each first symbol CP, l represents the position of the second symbol in a subframe, κ 6G =2 n1 , n1≥6, n1 is an integer.

[0044] In a possible implementation of the second aspect, when each first symbol subcarrier spacing is When the length of each first symbol excluding the CP and the length of each first symbol CP are calculated according to the following formula: s,D =1792·κ 6G 2 -μ-n

[0045] Among them, L s,D Indicates the length of each first symbol excluding CP, L s,CP represents the length of each first symbol CP, l represents the position of the second symbol in a subframe, κ 6G =2 n1 , n1≥6, n1 is an integer.

[0046] In a possible implementation of the second aspect, when the subcarrier spacing of each first symbol is 16·2 μ+n kHz, the length of each first symbol excluding the CP and the length of each first symbol CP are calculated according to the following formula: s,D=1920·κ 6G 2 -μ-n

[0047] Among them, L s,D Indicates the length of each first symbol excluding CP, L s,CP represents the length of each first symbol CP, l represents the position of the second symbol in a subframe, κ 6G =2 n1 , n1≥6, n1 is an integer.

[0048] In a possible implementation of the second aspect, when the subcarrier spacing of each first symbol is 19.2·2 μ+n kHz, the length of each first symbol excluding the CP and the length of each first symbol CP are calculated according to the following formula: s,D =1600·κ 6G 2 -μ-n

[0049] Among them, L s,D Indicates the length of each first symbol excluding CP, L s,CP represents the length of each first symbol CP, l represents the position of the second symbol in a subframe, κ 6G =2 n1 , n1≥6, n1 is an integer.

[0050] In a third aspect, a communication device is provided, which includes at least one processor and a memory, the processor and the memory are coupled, the memory stores program instructions, and when the program instructions stored in the memory are executed by the processor, the method in the above first aspect or any possible implementation of the first aspect is executed.

[0051] In a fourth aspect, a communication device is provided, comprising at least one processor and an interface circuit, wherein the at least one processor is configured to execute the method in the above first aspect or any possible implementation of the first aspect.

[0052] In a fifth aspect, a terminal device is provided, which includes the communication device provided in the second aspect, or the terminal device includes the communication device provided in the third aspect, or the terminal device includes the communication device provided in the fourth aspect.

[0053] In a sixth aspect, a network device is provided, which includes the communication device provided in the second aspect, or the communication device provided in the third aspect, or the communication device provided in the fourth aspect.

[0054] In a seventh aspect, a computer program product is provided, which includes a computer program. When the computer program is executed by a processor, it is used to execute the method in the above first aspect or any possible implementation of the first aspect.

[0055] In an eighth aspect, a computer-readable storage medium is provided, in which a computer program is stored. When the computer program is executed, it is used to execute the method in the above first aspect or any possible implementation of the first aspect.

[0056] In the ninth aspect, a chip is provided, which includes: a processor for calling and running a computer program from a memory, so that a communication device equipped with the chip executes a method for executing the above first aspect or any possible implementation of the first aspect.

[0057] In a tenth aspect, a communication system is provided, which includes the above-mentioned terminal device and network device. BRIEF DESCRIPTION OF THE DRAWINGS

[0058] FIG1 shows a comparison diagram of FDM and OFDM subcarrier arrangements.

[0059] FIG2 shows a schematic diagram of the spectrum of an OFDM system.

[0060] FIG3 shows a block diagram of OFDM modulation implementation.

[0061] FIG4 shows a schematic diagram of a symbol in the time domain after adding a CP.

[0062] FIG5 shows a comparison of the time-frequency width of one OFDM subcarrier (symbol) under different Numerologies.

[0063] FIG6 shows a schematic diagram of frame structures corresponding to different subcarrier widths.

[0064] FIG7 is a schematic diagram showing an OFDM symbol with an extended CP.

[0065] FIG8 shows a schematic diagram of an example of a transmitting end sending a downlink signal to a receiving end provided in an embodiment of the present application.

[0066] FIG9 shows a schematic diagram of another example of a transmitting end sending a downlink signal to a receiving end provided by an embodiment of the present application.

[0067] FIG10 shows a schematic diagram of simultaneously sending downlink signals using one subcarrier width and multiple subcarrier widths, as provided in an embodiment of the present application.

[0068] Figure 11 shows a schematic diagram of a network device provided in an embodiment of the present application sending a downlink signal to a first terminal device.

[0069] FIG12 shows a schematic diagram of splitting a reference signal based on a main symbol provided in an embodiment of the present application.

[0070] FIG13 shows another example of a schematic diagram of splitting a reference signal based on a main symbol provided in an embodiment of the present application.

[0071] FIG14 shows a schematic diagram of a reference signal splitting provided in an embodiment of the present application.

[0072] FIG15 shows a schematic diagram of a communication system provided in an embodiment of the present application.

[0073] FIG16 shows a schematic diagram of another communication system provided in an embodiment of the present application.

[0074] FIG17 shows a schematic diagram of another communication system provided in an embodiment of the present application.

[0075] Figure 18 shows a schematic flowchart of a communication method 1800 provided in an embodiment of the present application.

[0076] FIG19 shows a schematic block diagram of a communication device 1900 provided in an embodiment of the present application.

[0077] Figure 20 shows a schematic block diagram of another communication device 2000 provided in an embodiment of the present application.

[0078] FIG21 shows a schematic structural diagram of a network device 2100 provided in an embodiment of the present application.

[0079] FIG22 shows a schematic diagram of a chip system provided in an embodiment of the present application. DETAILED DESCRIPTION

[0080] The technical solution in this application will be described below with reference to the accompanying drawings.

[0081] The technical solutions of the embodiments of the present application 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), world-wide interoperability for microwave access (WiMAX) communication system, fifth generation (5G) system or future evolved communication system (such as 6G), etc.

[0082] The terminal device in the embodiments of the present application may refer to a user device, an access terminal, a user unit, a user station, a mobile station, a mobile station, a remote station, a remote terminal, a mobile device, a user terminal, a terminal, a wireless communication device, a user agent, or a user apparatus. The terminal device may also be a cellular phone, a cordless phone, a session initiation protocol (SIP) phone, a wireless local loop (WLL) station, a personal digital assistant (PDA), a handheld device with wireless communication capabilities, a computing device or other processing device connected to a wireless modem, an in-vehicle device, a wearable device, a terminal device in a 5G network or a terminal device in a future evolved network, etc., and the embodiments of the present application are not limited thereto.

[0083] The network device in the embodiment of the present application can be a device for communicating with a terminal device. The network device can be a base station (base transceiver station, BTS) in a global system for mobile communications (GSM) system or code division multiple access (CDMA), or a base station (NodeB, NB) in a wideband code division multiple access (WCDMA) system, or an evolved base station (eNB or eNodeB) in an LTE system, or a wireless controller in a cloud radio access network (CRAN) scenario, or the network device can be a relay station, an access point, an in-vehicle device, a wearable device, a network device in a 5G network, or a network device in a future evolved network, etc., and the embodiment of the present application is not limited.

[0084] In an embodiment of the present application, a terminal device or a network device may include a hardware layer, and optionally, may further include a software layer running on the hardware layer. The hardware layer may include a processor, and may also include hardware such as a memory management unit (MMU) or memory (also called main memory). The software layer stores computer instructions that facilitate the implementation of the methods of each embodiment of the present application. The embodiment of the present application does not specifically limit the specific structure or level of the execution subject of the method provided in the embodiment of the present application. As long as it can communicate according to the method provided in the embodiment of the present application by running a program that records the code of the method provided in the embodiment of the present application, it can be considered to be a terminal device or network device that implements the embodiment of the present application. For example, the execution subject of the method provided in the embodiment of the present application can be a communication module (such as a modem), a system on chip SoC, or other functional modules in the terminal device or network device.

[0085] In addition, various aspects or features of the present application can be implemented as methods, devices or products using standard programming and / or engineering techniques. The term "product" as used in this application covers computer programs that can be accessed from any computer-readable device, carrier or medium. For example, computer-readable media may include, but are not limited to: magnetic storage devices (e.g., hard disks, floppy disks or magnetic tapes, etc.), optical disks (e.g., compact discs (CDs), digital versatile discs (DVDs), etc.), smart cards and flash memory devices (e.g., erasable programmable read-only memories (EPROMs), cards, sticks or key drives, etc.). In addition, the various storage media described herein may represent one or more devices and / or other machine-readable media for storing information. The term "machine-readable medium" may include, but is not limited to, wireless channels and various other media capable of storing, containing and / or carrying instructions and / or data.

[0086] In the LTE / LTE-Advanced (LTE-A) / NR systems defined by the 3rd Generation Partnership Project (3GPP), downlink multiple access typically uses orthogonal frequency division multiple access (OFDMA). Downlink resources are divided into multiple OFDM symbols in time (the time domain) and into multiple subcarriers in frequency (the frequency domain).

[0087] Part of the time-frequency resources in the downlink is used to carry the physical downlink control channel (PDCCH). PDCCH is used to carry downlink control information (DCI). DCI is control information in the physical layer (Physical Layer) that the network equipment uses to instruct the user equipment (UE) on its behavior. At the same time, higher-layer signaling can also be used by the network equipment to instruct the UE on its behavior. Higher-layer signaling is indication information above the physical layer used to control and manage related UEs, such as radio resource control (RRC) signaling. Part of the time-frequency resources in the downlink is used to carry the physical downlink shared channel (PDSCH). PDSCH is used to carry data for interaction between user equipment and network equipment. PDSCH is shared by all user equipment connected to the network system.

[0088] In the process of indicating time-frequency resources, one granularity that characterizes the size of the system's time-domain resources is the time slot. For a slot-based frame structure, each slot includes 14 symbols; for a non-slot-based frame structure, each slot can include 2 / 4 / 7 symbols. Furthermore, it is defined that the granularity that characterizes the size of the system's frequency-domain resources can be the resource block (RB). In certain configurations, an RB includes 12 subcarriers, and each subband wave occupies a bandwidth of 15kHz. In the time domain, it can include one or more symbols.

[0089] In the embodiments of the present application, a symbol is also referred to as a time domain symbol, which may be an orthogonal frequency division multiplexing (OFDM) symbol or a single carrier frequency division multiple access (SC-FDMA) symbol, where SC-FDMA is also referred to as orthogonal frequency division multiplexing with transform precoding (OFDM with TP). It will be understood that in the embodiments of the present invention, the granularity representing the size of the system's time domain resources is not limited to a time slot, but may also be a subframe, a transmission time interval, a mini-slot, etc.

[0090] The following example illustrates FDM and OFDM systems using a mobile phone call. Figure 1 shows a comparison of FDM and OFDM subcarrier arrangements. As shown in Figure 1, assuming the center frequencies of these subbands (subcarriers) are f1, f2, f3, f4, etc., the call data from a mobile phone call is sampled and formed into a continuous data stream, D0, D1, D2, D3, D4, D5, D6, D7, D8, etc. FDM modulates the elements in this sequence onto the designated subbands f1, f2, f3, f4, etc., and then transmits them.

[0091] It should be understood that FDM refers to a communication system in which the bandwidth provided by a channel is typically much wider than the bandwidth required to transmit a single signal. Transmitting only one signal per channel is wasteful. To fully utilize the signal bandwidth, frequency division multiplexing (FDM) is employed. In an FDM system, the entire bandwidth is divided into several narrow subbands that do not overlap. To prevent interference between subbands (subcarriers), guard bands are often added between subbands, but this reduces spectrum efficiency.

[0092] OFDM: In order to overcome the disadvantage of low spectrum utilization of FDM, OFDM arranges the subcarriers in an overlapping manner while maintaining the orthogonality between the subcarriers (to avoid interference between subcarriers). Figure 2 shows a spectrum diagram of the OFDM system. The arrangement of partially overlapping subcarriers can greatly improve the spectrum efficiency because more subcarriers can be accommodated in the same bandwidth. Combined with Figure 1, OFDM first divides the data sequence into D0, D4, D8, ..., D1, D5, D9, ..., D2, D6, D 10 ,…,D3,D7,D 11, ...so that there are four subsequences (the number of subsequences here is only an example and does not represent the actual number). Then, the elements of the first subsequence are modulated onto frequency f1 and transmitted, the elements of the second subsequence are modulated onto frequency f2 and transmitted, the elements of the third subsequence are modulated onto frequency f3 and transmitted, and the elements of the fourth subsequence are modulated onto frequency f4 and transmitted. The four frequencies f1, f2, f3, and f4 are orthogonal to each other.

[0093] OFDM Modulation: Figure 3 shows the OFDM modulation implementation block diagram. As shown in Figure 3, the bit stream undergoes Quadrature Amplitude Modulation (QAM) or Phase Shift Keying (PSK) modulation to form a modulation symbol sequence, which is then input into the OFDM modulation module. In the OFDM modulation module, the symbol sequence undergoes serial-to-parallel conversion, subcarrier mapping, and IFFT. The parallel data is then converted into serial data and a guard interval (also known as a cyclic prefix) is added to form an OFDM symbol.

[0094] OFDM symbol duration: The duration of an effective OFDM symbol (in seconds) is equal to the inverse of the subcarrier spacing Δf. The duration of each OFDM symbol is equal to the duration of the effective OFDM symbol plus the duration of the CP part. Let T symb (in seconds) and T CP (in seconds) represent the duration of each OFDM symbol and the duration of the CP part, then T symb =1 / Δf+T CP .

[0095] OFDM symbol sampling time / sampling rate (occupied bandwidth): Continuing with Figure 3, the OFDM symbol output from block diagram 3 contains a series of discrete time samples. The time interval between two time samples is equal to the sampling time, and the sampling time is equal to the inverse of the sampling rate. The sampling rate is equal to Δf multiplied by the number of IFFT points performed by the IFFT module in Figure 3 (which may be referred to as FFT size in the embodiment of the present application). For example, if Δf is 15kHz and the FFT size is 2048, the sampling rate is 30.72MHz. The effective OFDM symbol (which may also be referred to as the OFDM symbol excluding the cyclic prefix in the embodiment of the present application) contains FFT size samples, and the FFT size multiplied by the sampling time (or divided by the sampling rate) is equal to 1 / Δf seconds.

[0096] The OFDM system has been introduced above. Next, we will introduce the cyclic prefix (CP). The CP is used to mitigate inter-symbol interference caused by multipath. Figure 4 shows a time-domain diagram of a symbol after adding the CP. As shown in Figure 4 (a), there are two OFDM symbols, A and B. Ideally, symbols A and B transmit data normally. However, if symbol A is slightly delayed, the end of symbol A will overflow into symbol B. To prevent this, a guard interval can be set between symbols A and B. This way, even if one symbol is delayed, it will not overflow into the next symbol. A common approach is to copy a portion of the signal at the end of the symbol and paste it into the interval. This copied portion added at the beginning is called a "cyclic prefix." For example, as shown in Figure 4 (b), a portion of the signal at the end of symbol A is copied and pasted at the beginning of symbol A, and a portion of the signal at the end of symbol B is copied and pasted at the beginning of symbol B. If symbol A is slightly delayed, the end of symbol A will not affect symbol B, thus avoiding mutual interference between symbols A and B.

[0097] The non-CP portion of an OFDM symbol is defined as an effective OFDM symbol. Inserting a CP involves copying the last small segment of an effective OFDM symbol and concatenating it to the beginning of the effective OFDM symbol. Wireless channels have multiple paths, each with arrival time deviations. The use of a CP causes circular convolution between the multipath channel and the effective OFDM symbol, which is equivalent to a point product in the frequency domain. Therefore, adding a CP mitigates multipath delay spread and simplifies receiver processing, leading the protocol to adopt the CP solution.

[0098] Fifth-generation mobile communication technology (5G) networks feature a wide frequency band span, flexible deployment methods, and diverse service types, necessitating a scalable parameter set. Numerology is a new concept introduced in 5G NR, and can be referred to as a parameter set. It primarily determines the frequency domain width (how much frequency bandwidth is occupied) and time domain length (how long it lasts) of an OFDM subcarrier signal. 5G systems will support services with vastly different Quality of Service (QoS) requirements, such as massive machine-type communications (mMTC), ultra-reliable and low-latency communications (URLLC), enhanced mobile broadband (eMBB), and multimedia broadcast multicast service (MBMS). To meet these diverse requirements, the next-generation radio (NR) will support multiple numerologies simultaneously. The following table is from 3GPP protocol TS38.211.

[0099] Table 1<38.211-Table 4.2-1:Supported transmission numerology>

[0100] As shown in Table 1, μ is the Numerology configuration index and Δf is the subcarrier spacing. As can be seen from Table 1, in addition to the 15 kHz subcarrier spacing already adopted in LTE, NR also introduces 30 kHz, 60 kHz, 120 kHz, and 240 kHz subcarrier spacing.

[0101] Figure 5 shows a comparison of the time-frequency width of a subcarrier (symbol) of OFDM under different Numerologies. The horizontal axis is the time domain duration and the vertical axis is the subcarrier spacing. As shown in Figure 5, the NR system supports multiple subcarrier spacings. The time length corresponding to the time slot is different under different subcarrier spacings. For example, when the subcarrier spacing is 15kHz, the time length corresponding to a slot is 1ms, when the subcarrier spacing is 30kHz, the time length corresponding to a slot is 0.5ms, when the subcarrier spacing is 60kHz, the time length corresponding to a slot is 0.25ms, and when the subcarrier spacing is 120kHz, the time length corresponding to a slot is 0.125ms. Since the number of symbols in a time slot has always been 14 or 12 symbols, it can be understood that the time length corresponding to a symbol also changes with the change of the subcarrier spacing.

[0102] In a multicarrier system, the symbol period and subcarrier spacing are related by T = 1 / subcarrier width. Therefore, the larger the subcarrier spacing, the shorter the symbol period. In the frame structure, 10ms is used as the benchmark, and a 10ms time span represents the length of a frame. A frame can be divided into multiple time slots, each containing 14 OFDM symbols.

[0103] As shown in the table in FIG5 , for different μ, the time length of 10 ms (ie, one frame) is:

[0104] in, Indicates the number of time slots contained in each frame, which is exponentially expanded as the parameter set is expanded. Indicates the number of OFDM symbols in each time slot. It is 14 in normal cyclic prefix and 12 in extended cyclic prefix. Indicates the number of time slots per subframe, which scales exponentially with the parameter set.

[0105] In the LTE system, a subframe has two time slots, but in the NR system, the time slot length depends on the subcarrier spacing. The wider the subcarrier spacing, the shorter the time slot duration. Figure 6 shows a schematic diagram of the frame structure corresponding to different subcarrier widths. As shown in Figure 6 (a), when μ = 0, the corresponding subcarrier width is 15kHz, and the time corresponding to one time slot is 1ms; as shown in Figure 6 (b), when μ = 1, the corresponding subcarrier width is 30kHz, and the time corresponding to one time slot is 0.5ms; as shown in Figure 6 (c), when μ = 2, the corresponding subcarrier width is 60kHz, and the time corresponding to one time slot is 0.25ms; as shown in Figure 6 (d), when μ = 3, the corresponding subcarrier width is 120kHz, and the time corresponding to one time slot is 0.125ms; as shown in Figure 6 (e), when μ = 4, the corresponding subcarrier width is 240kHz, and the time corresponding to one time slot is 0.0625ms. Therefore, it can be seen from FIG6 that the wider the subcarrier spacing, the shorter the duration of the time slot of each subframe.

[0106] The choice of subcarrier spacing depends on many factors, including deployment method (FDD or TDD), carrier frequency, service requirements (latency, reliability, and data rate), hardware quality (phase noise of the local crystal oscillator), mobility, and implementation complexity. For example, a large subcarrier spacing is suitable for delay-sensitive services (URLLC), small coverage areas, high carrier frequency scenarios, and high-speed mobility, while a small subcarrier spacing is suitable for enhanced broadcast / multicast services (eMBMSs), large coverage areas, low carrier frequency scenarios, low-speed mobility scenarios, and narrow-bandwidth devices.

[0107] For example, at low frequencies, network devices use a subcarrier width of less than 60 kHz when sending downlink signals. This is because a longer cyclic prefix is ​​required to cope with the rich multipath spread in low-frequency scenarios. At high frequencies, network devices use a subcarrier width of 120 kHz or 240 kHz when sending downlink signals. This is because a larger subcarrier width is more effective in resisting the nonlinear ideal factors caused by phase noise in high-frequency scenarios, and beamforming is performed in high-frequency scenarios. Therefore, high-frequency channel multipath spread is relatively small, and a very long CP is not required, making it suitable for high-throughput data transmission.

[0108] In addition, NR defines the sampling rate as Tc = 1 / (4096×480×10 3 In the protocol, the time length is described based on the sampling rate. For example, the length of a conventional OFDM symbol is defined as κ=64, where N represents the time length of N Tc, that is, the symbol period of an OFDM symbol is T c Second.

[0109] When each OFDM symbol is set with a CP, the period of each OFDM symbol changes from T to T+Tcp. The conventional CP scheme defined in the protocol is shown in the following table:

[0110] Table 2 Relationship between Numerology, CP, and OFDM symbol period

[0111] As shown in Table 2, as the subcarrier spacing becomes larger, the symbol duration and CP length are reduced proportionally. The reason for the proportional reduction is that the protocol takes into account the application scenario corresponding to the Numerology when it is designed. The CP length can cope with the maximum multipath delay spread corresponding to the scenario. However, there is still a certain possibility that the conventional CP length used in Table 2 cannot meet the system requirements. Therefore, the NR protocol additionally defines a CP length for subcarrier width = 60kHz, named extended CP. This mode is mainly for URLLC scenarios. The use of extended CP ensures that the CP is large enough to apply multipath delay spread. Another consideration is that the URLLC scenario needs to ensure fast signal processing. Therefore, a large enough CP can also reserve more time for baseband signal processing.

[0112] Currently, the NR system supports scheduling of various time units, and the length of a time unit can be one or more time domain symbols. For the normal cyclic prefix (NCP) time slot format, one slot includes 14 symbols. For the extended cyclic prefix (ECP) time slot format, one slot includes 12 symbols. Figure 7 shows a schematic diagram of an OFDM symbol with an extended CP. As shown in Figure 7, one slot of the extended CP includes 12 symbols.

[0113] The protocol is described from the perspective of the formula: the length of the OFDM symbol excluding the CP is recorded as The length of CP is in, Indicates the index of the symbol within the subframe. The CP duration and OFDM symbol duration can be obtained as follows (from protocol TS 38.211):

[0114] As mentioned above, the unit of time length in the above formula is T c =1 / (4096·480·10 3 ) seconds, κ=64.

[0115] Based on the above description, OFDM and CP-OFDM are introduced in detail. The following describes in detail how a transmitter uses OFDM technology to transmit a downlink signal to a receiver.

[0116] The transmitting end may be a network device, a terminal device, a satellite, etc. The receiving end may also be a network device, a terminal device, a satellite, etc. The embodiment of the present application does not limit the transmitting end device and the receiving end device of the signal.

[0117] In one possible implementation, DRMS ​​symbols are used for channel estimation during PDSCH / PUSCH demodulation. In the protocol, DRMS ​​symbols have the same subcarrier spacing Δf as data symbols. To track time-varying channels and support more accurate demodulation, the NR protocol introduces more DRMS ​​symbols or groups or increases the reference signal density in the time domain. That is, the transmitter sends multiple reference signals to the receiver. The receiver first estimates the channel at the reference signal and then interpolates in the time domain to obtain the channel at the transmitted data symbol, thereby demodulating the data.

[0118] For example, FIG8 shows a schematic diagram of an example provided by an embodiment of the present application of a transmitting end sending a downlink signal to a receiving end, where the downlink signal includes a reference signal and data. As shown in FIG8 , the transmitting end uses multiple CP-OFDM symbols to send a reference signal. Each CP-OFDM symbol has the same subcarrier width, and then the receiving end can estimate the channel at the reference signal based on the received reference signal, and then obtain the channel of the CP-OFDM symbol of the data sent by the transmitting end by interpolation in the time domain, and then demodulate the data. It can be seen from FIG8 that sending each reference signal requires an entire CP-OFDM symbol, so sending multiple reference signals will result in a large overhead.

[0119] The protocol defines support for up to three additional DRMS ​​symbols. The positions of the four DRMS ​​symbols are pos0, pos1, pos2, and pos0, respectively. The following table is from 3GPP protocol TS38.211.

[0120] Table 3 PDSCH DM-RS positions for single-symbol DM-RS

[0121] As shown in Table 3, for PDSCH mapping type A, l0∈{2,3}, the first DMRS is the third or fourth symbol of the time slot. For mapping type B, l0=0, the first DMRS is the first symbol of the PDSCH.

[0122] In another implementation, the overhead may be reduced by increasing the subcarrier width of the CP-OFDM for sending the reference signal and reducing the duration of the CP-OFDM for sending the reference signal.

[0123] For example, FIG9 shows another schematic diagram of another example of a transmitting end sending a downlink signal to a receiving end provided by an embodiment of the present application. As shown in FIG9 , the downlink signal can be a reference signal or data. As shown in FIG9 , since the subcarrier width of CP-OFDM symbol 2 where the reference signal is located is larger than the subcarrier width of CP-OFDM symbol 1 where the data is located, the duration of CP-OFDM symbol 2 is shorter than the duration of CP-OFDM symbol 1. Therefore, compared with the implementation described in FIG8 above, although this implementation uses an entire CP-OFDM symbol to send a reference signal, the overhead is relatively small.

[0124] Since the first method uses a single subcarrier width to send downlink signals, and the second method uses multiple subcarrier widths to send downlink signals, when the transmitter uses the first and second methods to send downlink signals to multiple receivers simultaneously, a large number of CP-OFDM symbols cannot be time-aligned. When CP-OFDM cannot be aligned, the following two problems will occur:

[0125] First, the first receiving end and the second receiving end cannot achieve frequency orthogonality, and a certain protection bandwidth needs to be reserved to prevent interference between users. If no protection band is reserved, the signal reception of the first receiving end and the second receiving end will be interfered with, and ultimately the demodulation performance of the receiving end will be lost, and the data cannot be demodulated normally.

[0126] Secondly, when CP-OFDM cannot be aligned, it increases the complexity of sending downlink data at the transmitter. Time domain signals need to be generated separately and finally superimposed and sent out. This is different from the first method, which can map the data of different receivers on different frequency domain subcarriers and generate the final transmitted time domain signal through a single inverse Fourier transform.

[0127] Exemplarily, Figure 10 shows a schematic diagram of simultaneously using a single subcarrier width and multiple subcarrier widths to send downlink signals provided by an embodiment of the present application. As shown in Figure 10, the transmitting end uses the same subcarrier width to send a reference signal and data to the first receiving end, and at the same time, the transmitting end uses different subcarrier widths to send a reference signal and data to the second receiving end. In this case, except for the first CP-OFDM alignment, the first receiving end and the second receiving end cannot be aligned in other CP-OFDMs, which increases the difficulty of the transmitting end sending downlink signals to the first receiving end and the second receiving end, and the first receiving end and the second receiving end may have data demodulation failures.

[0128] Based on the above problem, there is also a related technology that uses the position of the main symbol occupied by the reference signal when a single subcarrier width is used, and the main symbol is split into multiple sub-symbols. Some of the multiple sub-symbols are used to send or receive reference signals, and some of the sub-symbols are used to send or receive data, thereby reducing the overhead of sending reference signals while ensuring that multiple main symbols are aligned, that is, while reducing the overhead, it ensures the frequency orthogonality of multiple receiving ends, ensuring that the receiving end successfully demodulates the data.

[0129] Specifically, in this scheme, PDSCH / PUSCH symbols using a subcarrier spacing scheme are called primary symbols. Network devices indicate the specific primary symbol location of the reference signal (DMRS symbol) based on the primary symbol location. This primary symbol is split into N subsymbols by increasing the subcarrier spacing. At least one of these N subsymbols is a DMRS symbol, while the remaining subsymbols are used for data transmission.

[0130] For example, Figure 11 shows a schematic diagram of a network device provided in an embodiment of the present application sending a downlink signal to a first terminal device. As shown in Figure 11, the network device uses the same subcarrier width to send a downlink signal to the first terminal device through 6 CP-OFDM symbols. Then the 6 CP-OFDM symbols are called main symbols, that is, the 6 CP-OFDM symbols are main symbol 0, main symbol 1, main symbol 2, main symbol 3, main symbol 4, and main symbol 5 respectively.

[0131] In one possible implementation, the network device may indicate any one or more of the six CP-OFDM symbols to send a reference signal. For example, as shown in FIG11 , the network device may indicate main symbol 1 as the main symbol position where the reference signal is located, and main symbol 4 as the main symbol position where the reference signal is located.

[0132] In some possible implementations, the sub-symbol position used to send the reference signal or the sub-symbol position used to send the data signal is predefined.

[0133] For example, the sub-symbol used to send the reference signal may be the first sub-symbol. In this implementation, the second terminal device may quickly demodulate the channel after receiving the reference signal.

[0134] For another example, the sub-symbol used to send data may be the first sub-symbol, and the sub-symbol used to send the reference signal may be the second sub-symbol. In this implementation, when the first sub-symbol sends data, the sub-symbol CP of the reference signal may be extended to the previous sub-symbol to enhance the anti-multipath capability of the reference signal.

[0135] In some other possible implementations, the sub-symbol position for sending a reference signal or the sub-symbol position for sending a data signal may be indicated by a network device. This implementation can be flexibly adapted to various scenarios.

[0136] When a main symbol is split into multiple sub-symbols, there are two ways to determine the length of each sub-symbol CP and the length of each sub-symbol excluding the CP.

[0137] The first method: the length of each sub-symbol excluding the CP is 1 / N of the length of the main symbol excluding the CP.

[0138] For example, when the length of the main symbol excluding CP is L D , the length of the sub-symbol other than CP can be L D / N. In this implementation, N can be L D Divisible, for example, L D =2 M , N = 2 m , m≤M.

[0139] In a possible implementation, the length of each sub-symbol CP may be the same.

[0140] Optionally, the length of each sub-symbol CP is 1 / N of the length of the main symbol CP.

[0141] For example, when the length of the main symbol CP is L CP When the length of each sub-symbol CP is 1 / N of the length of the main symbol CP. In this implementation, the sum of the CP lengths of all sub-symbols can be equal to the CP length of the main symbol, thereby ensuring that the total duration of the main symbol is the same as the total duration of all corresponding sub-symbols.

[0142] For example, FIG12 shows a schematic diagram of a reference signal splitting based on a main symbol provided by an embodiment of the present application. As shown in FIG12, when L CP 144, L D When N is 2048 and N is 4, the length of the sub-symbol excluding the CP can be 2048 / 4=512, and the length of the CP of each sub-symbol is 144 / 4=36.

[0143] In another possible implementation, the lengths of the CPs of at least two sub-symbols in the N sub-symbols are different.

[0144] Optionally, the length of the CP of the sub-symbol used to send the reference signal is greater than the length of the CP of the sub-symbol other than the reference signal in the N sub-symbols. In this implementation, in order to adapt to various scenarios, the length of the CP of the sub-symbol can be arbitrarily specified.

[0145] For example, the network device may specify the length of the CP of a particular sub-symbol, and the CP length of the sub-symbol may be longer than that of other sub-symbols.

[0146] The specific sub-symbol may be any one or more of the multiple sub-symbols, and this embodiment of the present application does not limit this. For example, the specific sub-symbol may be the 1st, Nth, etc., or may be the first n reference signal sub-symbols, the last n reference signal sub-symbols, etc.

[0147] In other words, the N sub-symbols include sub-symbols of a first length and sub-symbols of a second length. The sub-symbols of the first length can be understood as specific sub-symbols, and the sub-symbols of the second length can be understood as non-specific sub-symbols.

[0148] When the number of sub-symbols of the first length is n, where n≥1 and n is an integer, the length of the CP of the sub-symbol of the first length satisfies the following formula:

[0149] Wherein, L1 represents the length of the sub-symbol CP of the first length, L CP represents the length of the main symbol CP, N represents the number of sub-symbols, and n represents the number of sub-symbols of the first length;

[0150] The length of the CP of the sub-symbol of the second length satisfies the following formula:

[0151] Wherein, L2 represents the length of the sub-symbol CP of the second length.

[0152] In some other possible implementations, when there are multiple specific sub-symbols, n is such that The maximum integer that can divide n. In this implementation, the number of specific sub-symbols is maximized as much as possible, and the CP lengths of the specific sub-symbols are the same.

[0153] In the above implementation, the value of N is related to the subcarrier width. The length of each subsymbol excluding the CP is determined based on the value of N and the length of the main symbol excluding the CP, and then the CP length of each subsymbol is adjusted to ensure that the total duration of the main symbol is the same as the total duration of all corresponding subsymbols.

[0154] The second way: the subcarrier width of each subsymbol is related to at least one of the subcarrier width of the main symbol, N, and the length of the main symbol CP.

[0155] Exemplarily, the subcarrier width of a subsymbol can be calculated using the following formula:

[0156] Where Δf represents the subcarrier width of the main symbol, L DIndicates the length of the main symbol excluding CP, L CP Indicates the length of the main symbol CP, N indicates the number of sub-symbols, A CP Indicates the length of each sub-symbol CP.

[0157] In one possible implementation, the length of each sub-symbol excluding the CP is related to at least one of the length of the main symbol excluding the CP, the length of the main symbol CP, the length of each sub-symbol CP, and the number N of sub-symbols.

[0158] Optionally, the length of each sub-symbol excluding the CP, the length of the main symbol excluding the CP, the main symbol CP length, the length of the sub-symbol CP, and the number of sub-symbols N may satisfy the following formula:

[0159] Where A represents the length of each sub-symbol excluding CP, L D Indicates the length of the main symbol excluding CP, L CP Indicates the length of the main symbol CP, N indicates the number of sub-symbols, A CP Indicates the length of each sub-symbol CP.

[0160] Optionally, in the above formula (6), A CP It can make (L D +L CP -N×A CP ) / N is an integer.

[0161] Optionally, in the above formula (6), the length of each sub-symbol CP may be equal.

[0162] In a possible implementation, in order to ensure the anti-multipath capability of the sub-symbol and the main symbol, A CP Can be used with the main symbol L CP In this implementation, (LD+LCP-N×ACP) / N may not be an integer.

[0163] For example, Figure 13 shows another example of a reference signal splitting diagram based on a main symbol provided in an embodiment of the present application. As shown in Figure 13, the length of the main symbol CP is 144, and the length of the main symbol excluding the CP is 2048. When N is 4, the length of the sub-symbol CP is 144, and the length of the sub-symbol excluding the CP is (2048+144-4×144) / 4=404.

[0164] In another possible implementation, the lengths of the CPs of at least two sub-symbols in the N sub-symbols are different.

[0165] Optionally, the length of the CP of the sub-symbol used to send the reference signal is greater than the length of the CP of the sub-symbol other than the reference signal in the N sub-symbols. In this implementation, in order to adapt to various scenarios, the length of the CP of the sub-symbol can be arbitrarily specified.

[0166] For example, the network device may specify the CP length of a sub-symbol for sending a reference signal, and the CP length of the sub-symbol may be longer than that of other sub-symbols.

[0167] For another example, the network device may specify that the length of the sub-symbol CP used to send the reference signal is greater than or equal to the length of the sub-symbol CP used to send the data signal.

[0168] The specific sub-symbol may be any one or more of the multiple sub-symbols, and this embodiment of the present application does not limit this. For example, the specific sub-symbol may be the 1st, Nth, etc., or may be the first n reference signal sub-symbols, the last n reference signal sub-symbols, etc.

[0169] In other words, the N sub-symbols include sub-symbols of a first length and sub-symbols of a second length. The sub-symbols of the first length can be understood as specific sub-symbols, and the sub-symbols of the second length can be understood as non-specific sub-symbols.

[0170] When the number of sub-symbols of the first length is n, where n≥1 and n is an integer, the length of the CP of the sub-symbol of the first length satisfies the following formula:

[0171] Wherein, L1 represents the length of each sub-symbol CP of the first length, K CP represents the total length of the sub-symbol CP, N represents the number of sub-symbols, and n represents the number of sub-symbols of the first length;

[0172] The length of the CP of the sub-symbol of the second length satisfies the following formula:

[0173] Wherein, L2 represents the length of the sub-symbol CP of the second length.

[0174] When the length of the sub-symbol excluding the CP is A, the total length of the remaining allocable sub-symbol CP is K CP =L D +L CP -N×A.

[0175] In some other possible implementations, when there are multiple specific sub-symbols, n is such that The maximum integer that can divide n. In this implementation, the number of specific sub-symbols is maximized as much as possible, and the CP lengths of the specific sub-symbols are the same.

[0176] In the second method, there are two problems with the length of the CP of each sub-symbol and the determination of the valid OFDM symbols in each sub-symbol:

[0177] Problem 1: When generating sub-symbols by the second method, the complexity of IFFT is high. Generally speaking, when the number of effective OFDM samples A in a sub-symbol can be factorized into the product of prime numbers 2, 3, 5, and 7, that is, A = 2 α *3 β *5 γ *7 θ (9)

[0178] Where A represents the size of the Fourier transform, α, β, γ, and θ are non-negative integers, and IFFT has a low implementation complexity.

[0179] For example, FIG14 shows a schematic diagram of reference signal splitting provided by an embodiment of the present application. As shown in FIG14 , when a main symbol is split into two sub-symbols, the first sub-symbol is the actual transmitted reference signal. The number of samples contained in the CP of the main symbol is 144, and the number of samples contained in the valid OFDM symbol in the main symbol is 2048. When the main symbol generates sub-symbols using the second method, the number of samples contained in the CP of the sub-symbol is 144, and the number of samples contained in the valid OFDM symbol in the sub-symbol is 952.

[0180] Continuing with Figure 13, when a main symbol is split into four sub-symbols, the first sub-symbol can actually transmit a reference signal. The number of samples contained in the CP of the main symbol is 144, and the number of samples contained in the valid OFDM symbol in the main symbol is 2048. When the main symbol generates sub-symbols using the second method, the number of samples contained in the CP of the sub-symbol is 144, and the number of samples contained in the valid OFDM symbol in the sub-symbol is 404.

[0181] Taking Figure 14 as an example, generating sub-symbols requires a 404-point IFFT, which can be factored into 404 = 2 2 ×101, which does not have the form of the above equation, so the implementation complexity of 404-point IFFT is relatively high. Taking Figure 13 as an example, generating sub-symbols requires a 952-point IFFT, and 952 can be factored into 952=2 3 ×7×17, which also does not have the form of the above equation, so the implementation complexity of 952-point IFFT is also relatively high.

[0182] The second problem is that sub-symbols cannot be easily expanded by powers of 2.

[0183] As shown in Table 1 above, in the current NR protocol, the minimum subcarrier spacing is 15kHz, and the subcarrier spacing is 2μ When the bandwidth or sampling rate (equal to the subcarrier spacing multiplied by the IFFT size) is fixed, when the subcarrier spacing is 2 μ When the IFFT size and CP length are expanded or reduced by 2 times, μ In the case where the main symbol adopts the Numerology in Table 1, it is hoped that the sub-symbol can also be expanded or reduced by 2 μ Expand. That is:

[0184] The subcarrier spacing of the subsymbol corresponding to N=4 is twice the subcarrier spacing of the subsymbol corresponding to N=2, the IFFT size of the subsymbol corresponding to N=2 is twice the IFFT size of the subsymbol corresponding to N=4, and the CP length of the subsymbol corresponding to N=2 is twice the length of the CP of the subsymbol corresponding to N=4.

[0185] However, based on the examples of Figures 13 and 14, when the main symbol is split into 2 sub-symbols, the IFFT size of the sub-symbol is not twice the IFFT size of the sub-symbol when the main symbol is split into 4 sub-symbols, that is, 952 is not twice the IFFT size of 402. In addition, the sub-symbol subcarrier spacing is Then, when the main symbol is split into 2 sub-symbols, the IFFT size of the sub-symbol is not twice the IFFT size of the sub-symbol when the main symbol is split into 4 sub-symbols, and the sub-carrier spacing of the sub-symbols when split into 4 sub-symbols is not twice the sub-carrier spacing of the sub-symbols when split into 2 sub-symbols.

[0186] Therefore, after the main symbol is split into multiple sub-symbols, how to reduce the complexity of sub-symbol generation or demodulation and how to easily expand the sub-symbols according to powers of 2 are problems that need to be solved.

[0187] In view of this, the present application provides a communication method, the method comprising: determining a subcarrier spacing of N first symbols, wherein the subcarrier spacing of each first symbol includes any one of the following: 20·2 φ kHz, 16.2 φ kHz and 19.2·2 φ kHz, where φ is a positive integer; at least one of data and reference signal is sent or received using N first symbols. The method provided by the present application is to determine the subcarrier spacing of the first symbol to be any one of the following: 20·2 φ kHz, 16.2 φ kHz and 19.2·2 φkHz, which ultimately reduces the implementation complexity of multiple sub-symbol generation or demodulation when the main symbol is split into multiple sub-symbols.

[0188] To facilitate understanding of the embodiments of the present application, a communication system applicable to the embodiments of the present application is first introduced in conjunction with Figure 15.

[0189] Figure 15 shows a schematic diagram of an example communication system provided by an embodiment of the present application. As shown in Figure 15, the communication system includes three communication devices, for example, a network device 1510, a terminal device 1520, and a terminal device 1530. Data communication can be performed between the network device 1510 and at least one of the terminal device 1520 and the terminal device 1530. For example, the network device 1510 can transmit a downlink signal to the terminal device 1520 or the terminal device 1530 using the communication method provided in the present application. Of course, the terminal device 1520 or the terminal device 1530 can also transmit an uplink signal to the network device 1510 using the communication method provided in the present application.

[0190] It should be understood that the communication system shown in FIG15 may further include more network nodes, such as terminal devices or network devices, and the network devices or terminal devices included in the communication system shown in FIG15 may be the various forms of network devices or terminal devices described above. The embodiments of the present application are not shown one by one in the figures.

[0191] Figure 16 shows a schematic diagram of another communication system provided by an embodiment of the present application. As shown in Figure 16, the communication system includes two satellites, such as satellite 1610 and satellite 1620. Among them, satellite 1610 and satellite 1620 are respectively composed of an acquisition, pointing, and tracking (APT) module and a communication module. The communication module is responsible for the transmission of information between satellites and is the main body of the inter-satellite communication system; the APT module is responsible for the acquisition, alignment and tracking between satellites, among which determining the incoming wave direction of the incident signal is acquisition, adjusting the transmitted wave to aim at the receiving direction is alignment, and continuously adjusting the alignment and capture during the entire communication process is tracking. Satellite 1610 can transmit information to satellite 1620 through the communication method provided by the present application.

[0192] Figure 17 shows a schematic diagram of another communication system provided by an embodiment of the present application. As shown in Figure 17 (a), the cellular communication system or wireless local area network communication system includes a network device 1710, a terminal device 1720, and a terminal device 1730, that is, a network device can transmit signals to multiple terminals using the communication method provided by the present application. As shown in Figure 17 (b), the cellular communication system or wireless local area network communication system includes a terminal device 1740, a network device 1750, and a network device 1760, that is, a terminal device can transmit signals to multiple network devices using the communication method provided by the present application.

[0193] The communication method provided in the present application is described in detail below in conjunction with Figure 18. Figure 18 shows a schematic flowchart of a communication method 1800 provided in an embodiment of the present application. This method 1800 can be applied in the scenarios shown in Figure 15, Figure 16 or Figure 17, and of course can also be applied in other communication scenarios. The embodiment of the present application does not limit this.

[0194] It should also be understood that in the embodiments of the present application, the methods are described using terminal devices and network devices as examples of the execution entities of the methods. As an example and not a limitation, the execution entities of the methods may also be chips, chip systems, or processors used in terminal devices and network devices. The communication methods provided in the embodiments of the present application are described below using the example of a network device as the transmitting end and a terminal device as the receiving end.

[0195] As shown in Fig. 18 , the method 1800 shown in Fig. 18 may include S1810 to S1820. The following describes each step in the method 1800 in detail with reference to Fig. 18 .

[0196] S1810: Determine the subcarrier spacing of N first symbols, where the subcarrier spacing of each first symbol includes any one of the following: 20·2 φ kHz, 16.2 φ kHz and 19.2·2 φ kHz, where φ is a positive integer;

[0197] It should be noted that the first symbol can be understood as a sub-symbol after the main symbol is split, and the second symbol can be understood as the main symbol. In the embodiment of the present application, before determining the subcarrier spacing of the N first symbols, the IFFT size of the sub-symbol is first determined based on the length of the sub-symbol after the split.

[0198] In one possible implementation, the total length of the first symbols with the same subcarrier spacing in N first subsymbols is the same as the length of a second symbol. In other words, the main symbol can be split into N subsymbols with the same subcarrier spacing, and the length of the main symbol is the same as the total length of the N subsymbols after the split.

[0199] As described above, in the related art, when a main symbol is split into multiple sub-symbols and the length of the main symbol CP is equal to the length of the sub-symbol CP, when the main symbol is split into two sub-symbols, the IFFT size of the sub-symbols is 952, and when it is split into four sub-symbols, the IFFT size of the sub-symbols is 404. It can be seen that when designing reference symbol splitting, when the length of the main symbol CP is equal to the length of the sub-symbol CP, 952 and 404 do not meet the conditions for factorization, resulting in high IFFT implementation complexity. In addition, 952 is not twice 404, and the sub-symbols cannot be expanded by powers of 2.

[0200] Based on this, in this embodiment of the present application, the constraint on the length of the main symbol CP and the length of the sub-symbol CP can be relaxed to ensure that the length of the main symbol CP and the length of the sub-symbol CP are similar. Under the premise that the length of the main symbol CP and the length of the sub-symbol CP are similar, the subcarrier spacing, FFT size, and the length of the sub-symbol CP are determined.

[0201] The following describes how to determine the FFT size of a sub-symbol, assuming that the length of the main symbol CP is similar to that of the sub-symbol CP:

[0202] In the above analysis, when the FFT size satisfies formula (9), FFT / IFFT has lower implementation complexity.

[0203] In some embodiments, in order to ensure that the FFT / IFFT of the sub-symbols has a lower implementation complexity when the main symbol is split into sub-symbols, the Fourier change size of each first symbol in the N first symbols can satisfy the above formula (9), that is, the Fourier change size of each sub-symbol can satisfy the above formula (9).

[0204] In NR, FFT size is equal to 2 α , that is, in formula (9), β, γ, and θ are all 0. Of course, in the above formula, β, γ, and θ can also take other values. Table 4 lists other values ​​of β, γ, and θ, including β = 1, γ = θ = 0, γ = 1, β = θ = 0, β = γ = 0, θ = 1, β = 2, γ = θ = 0, β = γ = 1, θ = 0, β = θ = 1, γ = 0, θ = 2, β = γ = 0, β = 0, γ = θ = 1, and the value of FFT size A when α is 1, 2, 3, ..., 10.

[0205] Table 4 FFT size when β, γ, and θ take other values ​​and α takes 1, 2, 3, ..., 10

[0206] Table 4 lists the FFT sizes when β, γ, and θ take other values ​​and α takes 1, 2, 3, ..., 10. Under the constraint of relaxing the length of the main symbol CP and the length of the sub-symbol CP, the FFT size of the sub-symbol can be determined based on the FFT size in Table 4.

[0207] In a possible implementation, a difference between a length of each first symbol excluding the CP and a first value is less than or equal to a first threshold, and the first value satisfies the following calculation formula:

[0208] Wherein, B represents the first value, L D Indicates the length of the second symbol excluding CP, L CP represents the length of the second symbol CP, and N represents the number of first symbols.

[0209] It should be noted that the first value is the length of the sub-symbol excluding the CP when the main symbol and sub-symbol CP lengths are the same. That is, when the constraints on the main symbol CP length and the sub-symbol CP length are relaxed, the difference between the sub-symbol length excluding the CP and the first value is less than or equal to the first threshold.

[0210] It should be understood that the size of the first threshold can be set according to specific circumstances and is not specifically limited in the embodiments of the present application.

[0211] In a possible implementation manner, the first threshold is related to at least one of the subcarrier spacing of the second symbol and the number of the first symbols.

[0212] That is, the value of the first threshold is related to the subcarrier spacing of the main symbol. Based on the above formula (2), it can be seen that the subcarrier spacing of the main symbol determines the length of the main symbol. Under the constraint that the subsymbol and the main symbol CP are equal in length, the IFFT size of the subsymbol satisfies formula (10). Under the condition of relaxing the constraint of the length of the main symbol CP and the length of the subsymbol CP, the absolute value of the difference between the IFFT size of the subsymbol and the first value is less than or equal to the first threshold. When the first value is large, the value of the first threshold can be relatively large.

[0213] The value of the first threshold may also be related to the number of sub-symbols split. When the main symbol is split into more sub-symbols, the first threshold becomes smaller and smaller. For example, when the main symbol is split into 2 sub-symbols, the first threshold may be 200, and when the main symbol is split into 4 main symbols, the first threshold may be 100.

[0214] For example, when N is 2, the IFFT size of the sub-symbol is no longer equal to 952 (the first value), and the absolute value of the difference between the IFFT size of the sub-symbol and 952 is less than or equal to a first threshold. Exemplarily, the first threshold may be 200, and the absolute value of the difference between the IFFT size of the sub-symbol and 952 is less than or equal to 200.

[0215] For another example, when N is 4, the IFFT size of the sub-symbol is no longer equal to 404 (the first value), and the absolute value of the difference between the IFFT size of the sub-symbol and 404 is less than or equal to a first threshold. Exemplarily, the first threshold may be 100, and the absolute value of the difference between the IFFT size of the sub-symbol and 404 is less than or equal to 100.

[0216] Combined with Table 4, it can be seen that when A=3·2 α IFFT sizes 384 and 768 are closer to 404 and 952. When the main symbol is split into two sub-symbols, the IFFT size of each sub-symbol can be 768; when the main symbol is split into four sub-symbols, the IFFT size of each sub-symbol can be 384.

[0217] When A=7·2 α When the main symbol is split into two sub-symbols, the IFFT size of each sub-symbol can be 896; when the main symbol is split into four sub-symbols, the IFFT size of each sub-symbol can be 448.

[0218] When A=3·5·2 α When the main symbol is split into two sub-symbols, the IFFT size of each sub-symbol can be 960; when the main symbol is split into four sub-symbols, the IFFT size of each sub-symbol can be 480.

[0219] When A=5 2 2 α When the main symbol is split into two sub-symbols, the IFFT size of each sub-symbol can be 800; when the main symbol is split into four sub-symbols, the IFFT size of each sub-symbol can be 400.

[0220] The above specifically describes how to determine the IFFT size of each subsymbol. The following describes the CP length and subcarrier spacing of the subsymbol based on the 6G communication system. Of course, the calculation of the CP length of the subsymbol and the subcarrier spacing are also applicable to the NR system and LTE system. This application uses the 6G communication system as an example, but does not constitute a limitation on the communication system. The following first introduces the basic time unit of 6G.

[0221] NR defines the basic time unit Tc = 1 / (4096·480·10 3 ) seconds, and the effective OFDM duration and CP duration of OFDM symbols under different Numerology are given. See formula (2) for details. Combined with T c From the expression, we can find that the basic unit Tc of NR corresponds to a subcarrier spacing of 480kHz (480=15·2 5 ), OFDM symbol sampling time when the FFT size is 4096.

[0222] In LTE, the basic time unit is 1 / (2048·15·10 3 ) seconds, it can be seen that the basic time unit of LTE is κ = 64 times that of NR. The basic time unit of LTE corresponds to the OFDM symbol sampling time when the subcarrier spacing is 15 kHz and the FFT size is 2048.

[0223] For future 6G or other communication systems, system bandwidth may be further increased, and semiconductor technology will continue to advance. Therefore, future communication systems may support larger subcarriers (i.e., μ takes a larger value, such as μ = 7 corresponding to a subcarrier spacing of 1920kHz) and more IFFTs (e.g., the number of FFT points continues to expand by powers of 2 based on 4096. For example, expanding by 2 to the power of 1 corresponds to an 8192-point FFT; if expanding by 2 to the power of 2, it corresponds to a 16384-point FFT).

[0224] In the embodiment of the present application, it is possible to define It is the basic time unit of 6G, taking into account the forward compatibility. May be equal to in is a non-negative integer power of 2.

[0225] For example, It can be but not limited to 1, 2, 4, 16, 32, 64, etc.

[0226] For example So The basic time unit can be 1 / (16384·1920·10 3 ) seconds or 1 / (8192·3840·10 3 ) or it can also be other combinations of FFT points and subcarrier spacing, which are not limited here.

[0227] For example So The basic time unit can be 1 / (16384·7680·10 3 ) seconds or 1 / (32768·3840·10 3 ) or it can also be other combinations of FFT points and subcarrier spacing, which are not limited here.

[0228] by is the basic time unit, similar to the and The duration of each OFDM symbol excluding the CP and the duration of each OFDM symbol CP can be expressed as and describe.

[0229] in, Since κ=64, The value can be 1, 2, 4, 8, 16, 32, 64, .... Therefore, κ 6G The value can be 64, 128, 256, 512, 1024, 2048, 4096, ..., l represents the position of the main symbol in a subframe.

[0230] Using the basic time unit of 6G to describe the time length, the following analysis shows that the main symbol subcarrier spacing is 15·2 μ The length of the main symbol excluding the CP and the CP length are given as above. When the main symbol is split into two (i.e., n=1) and four sub-symbols (i.e., n=2), the length of the sub-symbol excluding the CP and the CP length are respectively corresponding.

[0231] (1) When the main symbol is split into two sub-symbols, and the length of the sub-symbols excluding the CP is 768 k 6G 2 -μ .

[0232] When the main symbol contains a regular CP, the CP length of the main symbol is 144 k 6G 2 -μ , the sub-symbol CP length is:

[0233] When the main symbol contains a regular CP, the CP length of the main symbol is 144·κ6G 2 -μ +16·κ 6G , the sub-symbol CP length is:

[0234] If the main symbol contains an extended CP, the CP length of the main symbol is 512·κ 6G 2 -μ , the sub-symbol CP length is:

[0235] The sub-symbol sub-carrier spacing is Assuming μ is 0, the sub-symbol sub-carrier spacing is 40kHz (= 20·2 1 Assuming μ is 1, the sub-symbol sub-carrier spacing is 80kHz (= 20·2 2 ). It can be seen that the sub-symbol sub-carrier spacing is 2 φ =2 μ+n to expand.

[0236] When the main symbol is split into two sub-symbols, the length of the sub-symbol excluding the CP is 896 k 6G 2 -μ .

[0237] When the main symbol contains a regular CP, the CP length of the main symbol is 144 k 6G 2 -μ , the sub-symbol CP length is:

[0238] If the main symbol contains a regular CP, the CP length of the main symbol is 144·κ 6G 2 -μ +16·κ 6G , the sub-symbol CP length is:

[0239] If the main symbol contains an extended CP, the CP length of the main symbol is 512 k 6G 2 -μ , the sub-symbol CP length is:

[0240] The sub-symbol sub-carrier spacing is Assuming μ is 0, the sub-symbol subcarrier spacing is 34.28571kHz Assuming μ is 1, the sub-symbol subcarrier spacing is 68.57143kHz It can be seen that the sub-symbol sub-carrier spacing is 2 φ to expand.

[0241] When the main symbol is split into two sub-symbols, the length of the sub-symbol excluding the CP is 960 k 6G2 -μ .

[0242] When the main symbol contains a regular CP, the CP length of the main symbol is 144 k 6G 2 -μ , the sub-symbol CP length is:

[0243] If the main symbol contains a regular CP, the CP length of the main symbol is 144·κ 6G 2 -μ +16·κ 6G , the sub-symbol CP length is:

[0244] If the main symbol contains an extended CP, the CP length of the main symbol is 512 k 6G 2 -μ , the sub-symbol CP length is:

[0245] The sub-symbol sub-carrier spacing is Assuming μ is 0, the sub-symbol sub-carrier spacing is 32kHz (=16·2 1 Assuming μ is 1, the sub-symbol sub-carrier spacing is 64kHz (=16·2 2 ). It can be seen that the sub-symbol sub-carrier spacing is 2 φ to expand.

[0246] When the main symbol is split into two sub-symbols, the length of the sub-symbol excluding the CP is 800 k 6G 2 -μ .

[0247] When the main symbol contains a regular CP, the CP length of the main symbol is 144 k 6G 2 -μ , the sub-symbol CP length is:

[0248] If the main symbol contains a regular CP, the CP length of the main symbol is 144·κ 6G 2 -μ +16·κ 6G , the sub-symbol CP length is:

[0249] If the main symbol contains an extended CP, the CP length of the main symbol is 512·κ 6G 2 -μ , the sub-symbol CP length is:

[0250] The sub-symbol sub-carrier spacing is Assuming μ is 0, the sub-symbol sub-carrier spacing is 38.4kHz (=19.2·2 1 Assuming μ is 1, the sub-symbol sub-carrier spacing is 76.8kHz (=19.2·2 2 ). It can be seen that the sub-symbol sub-carrier spacing is 2 φ to expand.

[0251] (2) When the main symbol is split into 4 sub-symbols, and the length of the sub-symbols excluding the CP is 384·κ 6G 2 -μ .

[0252] When the main symbol contains a regular CP, the CP length of the main symbol is 144·κ 6G 2 -μ , the sub-symbol CP length is:

[0253] If the main symbol contains a regular CP, the CP length of the main symbol is 144·κ 6G 2 -μ +16·κ 6G , the sub-symbol CP length is:

[0254] If the main symbol contains an extended CP, the CP length of the main symbol is 512·κ 6G 2 -μ , the sub-symbol CP length is:

[0255] The sub-symbol sub-carrier spacing is Assuming μ is 0, the sub-symbol sub-carrier spacing is 80kHz (= 20·2 2 Assuming μ is 1, the sub-symbol sub-carrier spacing is 160kHz (= 20·2 3 ). It can be seen that the sub-symbol sub-carrier spacing is 2 φ to expand.

[0256] When the main symbol is split into 4 sub-symbols, and the length of the sub-symbols excluding the CP is 448·κ 6G 2 -μ .

[0257] When the main symbol contains a regular CP, the CP length of the main symbol is 144·κ 6G 2 -μ , the sub-symbol CP length is:

[0258] If the main symbol contains a regular CP, the CP length of the main symbol is 144·κ 6G 2 -μ +16·κ 6G, the sub-symbol CP length is:

[0259] When the main symbol contains an extended CP, the CP length of the main symbol is 512·κ 6G 2 -μ , only for the case where the main symbol subcarrier spacing is 60kHz, the length of the subsymbol CP is:

[0260] The sub-symbol sub-carrier spacing is Assuming μ is 0, the sub-symbol subcarrier spacing is 68.57143kHz Assuming μ is 1, the sub-symbol subcarrier spacing is 137.14286kHz It can be seen that the sub-symbol sub-carrier spacing is 2 φ to expand.

[0261] When the main symbol is split into 4 sub-symbols, and the length of the sub-symbols excluding the CP is 480·κ 6G 2 -μ .

[0262] When the main symbol contains a regular CP, the CP length of the main symbol is 144·κ 6G 2 -μ , the sub-symbol CP length is:

[0263] If the main symbol contains a regular CP, the CP length of the main symbol is 144·κ 6G 2 -μ +16·κ 6G , the sub-symbol CP length is:

[0264] When the main symbol contains an extended CP, the CP length of the main symbol is 512·κ 6G 2 -μ , only for the case where the main symbol subcarrier spacing is 60kHz, the length of the subsymbol CP is:

[0265] The sub-symbol sub-carrier spacing is Assuming μ is 0, the sub-symbol sub-carrier spacing is 64kHz (=16·2 2 Assuming μ is 1, the sub-symbol sub-carrier spacing is 128kHz (= 16·2 3 ). It can be seen that the sub-symbol sub-carrier spacing is 2 μ to expand.

[0266] When the main symbol is split into 4 sub-symbols, and the length of the sub-symbols excluding the CP is 400·κ 6G 2-μ .

[0267] When the main symbol contains a regular CP, the CP length of the main symbol is 144·κ 6G 2 -μ , the sub-symbol CP length is:

[0268] If the main symbol contains a regular CP, the CP length of the main symbol is 144·κ 6G 2 -μ +16·κ 6G , the sub-symbol CP length is:

[0269] When the main symbol contains an extended CP, the CP length of the main symbol is 512·κ 6G 2 -μ , only for the case where the main symbol subcarrier spacing is 60kHz, the length of the subsymbol CP is:

[0270] The sub-symbol sub-carrier spacing is Assuming μ is 0, the sub-symbol sub-carrier spacing is 76.8kHz (=19.2·2 2 Assuming μ is 1, the sub-symbol sub-carrier spacing is 153.6kHz (=19.2·2 3 ). It can be seen that the sub-symbol sub-carrier spacing is 2 φ to expand.

[0271] Based on the calculations of the subsymbol CP length and subsymbol subcarrier spacing described above, it can be seen that the subsymbol CP length is similar to the main symbol CP length. Below, based on the design of the subsymbol value N, the calculation formulas for the subsymbol length excluding the CP and the subsymbol CP length related to N are given.

[0272] It should be understood that in the case of a normal CP, the OFDM symbol length is 2192·κ 6G 2 -μ or 2192·κ 6G 2 -μ +16·κ 6G ; In the case of extended CP, the OFDM symbol length is 2560·κ 6G 2 -μ 16·κ 6G It is a power of 2. To make the CP length of the sub-symbol an integer, the number N of sub-symbols can be a power of 2.

[0273] Therefore, in one possible implementation, N=2 n , where n is a positive integer, n = 1, 2, 3,….

[0274] When the sub-symbol FFT size has factorization A=3·2 α When α is a non-negative integer, the subcarrier spacing of each subsymbol is 20·2 μ+n kHz, the length of each sub-symbol excluding the CP and the length of each sub-symbol CP are calculated according to the following formula: L s,D =1536·κ 6G 2 -μ-n

[0275] Among them, L s,D Indicates the length of each first symbol excluding CP, L s,CP represents the length of each first symbol CP, l represents the position of the second symbol in a subframe, κ 6G =2 n1 , n1≥6, n1 is an integer.

[0276] When the sub-symbol FFT size has factorization A=7·2 α When α is a non-negative integer, the subcarrier spacing of each subsymbol is The length of each sub-symbol excluding the CP and the length of each sub-symbol CP are calculated according to the following formula: s,D =1792·κ 6G 2 -μ-n

[0277] When the sub-symbol FFT size has factorization A = 3·5·2 α When α is a non-negative integer, the subcarrier spacing of each subsymbol is 16·2 μ+n kHz, the length of each sub-symbol excluding the CP and the length of each sub-symbol CP are calculated according to the following formula: L s,D =1920·κ 6G 2 -μ-n

[0278] When the sub-symbol FFT size has factorization A=5 2 2 α , where α is a non-negative integer and the subcarrier spacing of each subsymbol is 19.2·2 μ+n kHz, the length of each sub-symbol excluding the CP and the length of each sub-symbol CP are calculated according to the following formula: L s,D =1600·κ 6G 2 -μ-n

[0279] The above specifically describes how to calculate the subsymbol FFT size, subsymbol CP length, and subsymbol subcarrier spacing in the 6G system, assuming that the constraints on the subsymbol CP length and main symbol CP length are relaxed and the Fourier transform of the subsymbol FFT size satisfies formula (9). The following describes the FFT size, subsymbol CP length, and subsymbol subcarrier spacing corresponding to the four subsymbol schemes in the NR system and LTE based on Tables 5-9.

[0280] It should be noted that the CP length is 144·κ considering the main symbol CP length 6G 2 -μ The main symbol CP length is 144·κ 6G 2 -μ +16·κ 6G Or in the case of extended CP, the CP length can be obtained according to formulas (12)-(15).

[0281] It should be understood that considering the 6G basic time unit, the corresponding FFT size and CP length are equal to the FFT size and CP length under the NR basic time unit multiplied by

[0282] Table 5 NR solution

[0283] Table 6 Sub-symbol scheme 1

[0284] Table 7 Sub-symbol scheme 2

[0285] Table 8 Sub-symbol scheme 3

[0286] Table 9 Sub-symbol scheme 4

[0287] S1820. Use N first symbols to send or receive at least one of data and a reference signal.

[0288] In an embodiment of the present application, the network device may use the sub-symbol corresponding to the above-mentioned sub-symbol scheme to send a reference signal or send data, or use the sub-symbol to send a reference signal and send data.

[0289] Alternatively, the terminal device may use the sub-symbol corresponding to the above sub-symbol scheme to receive a reference signal or data, or use the sub-symbol to receive a reference signal and receive data.

[0290] The communication method provided in the embodiment of the present application is to determine the subcarrier spacing of the first symbol to be any one of the following: 20·2 φ kHz, 16.2 φ kHz and 19.2·2 φ kHz, which ultimately reduces the implementation complexity of multiple sub-symbol generation or demodulation when the main symbol is split into multiple sub-symbols.

[0291] It should be understood that the methods, situations, categories and divisions of the embodiments in the present application are only for the convenience of description and should not constitute special limitations. The features of various methods, categories, situations and embodiments can be combined without contradiction.

[0292] It should also be understood that the above is only intended to help those skilled in the art better understand the embodiments of the present application, and is not intended to limit the scope of the embodiments of the present application. Based on the above examples given, those skilled in the art can obviously make various equivalent modifications or changes. For example, certain steps may be unnecessary, or certain new steps may be added. Or a combination of any two or any multiple of the above embodiments. Such modifications, changes, or combined solutions also fall within the scope of the embodiments of the present application.

[0293] It should also be understood that the above description of the embodiments of the present application focuses on emphasizing the differences between the various embodiments. The same or similar points that are not mentioned can be referenced with each other. For the sake of brevity, they will not be repeated here.

[0294] It should also be understood that the size of the serial numbers of the above-mentioned processes does not mean the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of this application.

[0295] It should also be understood that in the embodiments of the present application, "pre-setting" and "pre-definition" can be achieved by pre-saving corresponding codes, tables or other methods that can be used to indicate relevant information in devices (for example, including terminal devices and network devices). This application does not limit its specific implementation method.

[0296] It should also be understood that in the various embodiments of the present application, unless otherwise specified or there is a logical conflict, the terms and / or descriptions between different embodiments are consistent and can be referenced to each other, and the technical features in different embodiments can be combined to form new embodiments according to their internal logical relationships.

[0297] The above describes in detail the examples of communication methods provided by the present application. It is understandable that, in order to implement the above functions, the terminal equipment and the network equipment include hardware structures and / or software modules corresponding to the execution of each function. Those skilled in the art should easily realize that, in combination with the units and algorithm steps of each example described in the embodiments disclosed herein, the present application can be implemented in the form of hardware or a combination of hardware and computer software. Whether a function is executed in a hardware or computer software driven hardware manner depends on the specific application and design constraints of the technical solution. Professional and technical personnel can use different methods to implement the described functions for each specific application, but such implementation should not be considered to be beyond the scope of the present application.

[0298] The communication device provided by this application will be introduced below.

[0299] For example, Figure 19 shows a schematic block diagram of a communication device 1900 provided in an embodiment of the present application. The communication device 1900 may correspond to the network device described in each embodiment of the above method 1800, or may be a chip or component applied to the network device. Moreover, each module or unit in the communication device 1900 is used to execute each action or processing process performed by the network device described in each embodiment of the above method 1800.

[0300] As shown in FIG19 , the communication device 1900 includes a processing unit 1910 and a transceiver unit 1920. The transceiver unit 1920 is configured to perform specific signal transmission and reception under the drive of the processing unit 1910.

[0301] In some embodiments:

[0302] The processing unit 1910 is configured to determine a subcarrier spacing of N first symbols, where the subcarrier spacing of each first symbol includes any one of the following: 20·2 φ kHz, 16.2 φ kHz and 19.2·2 φ kHz, where φ is a positive integer;

[0303] The transceiver unit 1920 is configured to send at least one of data and a reference signal using the N first symbols.

[0304] The communication device provided by the present application determines the subcarrier spacing of the first symbol to be any one of the following: 20·2 φ kHz, 16.2 φ kHz and 19.2·2 φ kHz, which ultimately reduces the implementation complexity of multiple sub-symbol generation or demodulation when the main symbol is split into multiple sub-symbols.

[0305] Optionally, the total length of the N first symbols with the same subcarrier spacing is the same as the length of one second symbol.

[0306] Optional, N=2 n , n is a positive integer.

[0307] Optionally, the Fourier transform size of each of the N first symbols satisfies: A=2 α *3 β *5 γ *7 θ

[0308] Wherein, A represents the magnitude of the Fourier transform of the first symbol, and α, β, γ, and θ are non-negative integers.

[0309] In this implementation, when the Fourier transform size of each first symbol excluding the CP satisfies the above formula, the Fourier transform complexity of the generated sub-symbol is low.

[0310] Optionally, a difference between the length of each first symbol excluding the cyclic prefix CP and the first value is less than or equal to a first threshold, and the first value satisfies the following calculation formula:

[0311] Wherein, B represents the first value, L D Indicates the length of the second symbol excluding CP, L CP represents the length of the second symbol CP, and N represents the number of first symbols.

[0312] Optionally, the first threshold is related to at least one of the subcarrier spacing of the second symbol and the number of the first symbols.

[0313] Optionally, the length of each first symbol except the CP is the same, and the CP length of each first symbol is the same.

[0314] Optionally, the subcarrier spacing of the second symbol is 15·2 μ kHz, where μ=φ-n, and μ is a non-negative integer. In this implementation, the relationship between μ in the subcarrier width of the second symbol and the subcarrier spacing of the first symbol is μ=φ-n.

[0315] Optionally, when the subcarrier spacing of each first symbol is 20·2 μ+n kHz, the length of each first symbol excluding the CP and the length of each first symbol CP are calculated according to the following formula: s,D =1536·κ 6G 2 -μ-n

[0316] Among them, L s,D Indicates the length of each first symbol excluding CP, L s,CP represents the length of each first symbol CP, l represents the position of the second symbol in a subframe, κ 6G =2 n1 , n1≥6, n1 is an integer.

[0317] Optionally, when each first symbol subcarrier spacing is When the length of each first symbol excluding the CP and the length of each first symbol CP are calculated according to the following formula: s,D =1792·κ 6G 2 -μ-n

[0318] Among them, L s,D Indicates the length of each first symbol excluding CP, L s,CP represents the length of each first symbol CP, l represents the position of the second symbol in a subframe, κ 6G =2 n1 , n1≥6, n1 is an integer.

[0319] Optionally, when the subcarrier spacing of each first symbol is 16·2 μ+n kHz, the length of each first symbol excluding the CP and the length of each first symbol CP are calculated according to the following formula: s,D =1920·κ 6G 2 -μ-n

[0320] Among them, L s,D Indicates the length of each first symbol excluding CP, L s,CP represents the length of each first symbol CP, l represents the position of the second symbol in a subframe, κ 6G =2 n1 , n1≥6, n1 is an integer.

[0321] Optionally, when the subcarrier spacing of each first symbol is 19.2·2 μ+n kHz, the length of each first symbol excluding the CP and the length of each first symbol CP are calculated according to the following formula: s,D =1600·κ 6G 2 -μ-n

[0322] Among them, Ls,D Indicates the length of each first symbol excluding CP, L s,CP represents the length of each first symbol CP, l represents the position of the second symbol in a subframe, κ 6G =2 n1 , n1≥6, n1 is an integer.

[0323] It should be understood that the specific processes for each unit in communication device 1900 to perform the above-mentioned steps can be found in the description of the network device in conjunction with method 1800 and the related embodiments in FIG18 . For example, transceiver unit 1920 can perform the steps involving receiving and sending in the above-mentioned method embodiments, while processing unit 1910 can perform steps other than receiving and sending. The various specific processes are described in the method embodiments. For the sake of brevity, they are not further described here.

[0324] When the execution subject in the above-mentioned method 1800 and Figure 18 is a terminal device, please refer to the description related to the terminal device in the previous text combined with the method 1800 and the relevant embodiments in Figure 18 for the specific process of each unit in the communication device 1900 executing the above-mentioned corresponding steps.

[0325] It should be understood that the transceiver unit 1920 may be a transceiver, an input / output interface, or an interface circuit. The storage unit may be a memory. The processing unit 1910 may be implemented by a processor. Figure 20 shows a schematic block diagram of another example communication device 2000 provided in an embodiment of the present application. As shown in Figure 20, the communication device 2000 may include a processor 2010, a memory 2020, and a transceiver 2030.

[0326] The communication device 1900 shown in FIG19 or the communication device 2000 shown in FIG20 can implement the steps performed by the network device or terminal device in each embodiment of the aforementioned method 1800. Similar descriptions can refer to the descriptions of the corresponding methods described above. To avoid repetition, they are not repeated here.

[0327] It should also be understood that the communication device 1900 shown in FIG. 19 or the communication device 2000 shown in FIG. 20 may be a network device or a terminal device.

[0328] It should also be understood that the division of units in the above device is merely a division of logical functions. In actual implementation, they can be fully or partially integrated into one physical entity, or they can be physically separated. Moreover, the units in the device can all be implemented in the form of software called through processing elements; or all be implemented in the form of hardware; or some units can be implemented in the form of software called through processing elements, and some units can be implemented in the form of hardware. For example, each unit can be a separately established processing element, or it can be integrated into a certain chip of the device. In addition, it can also be stored in a memory in the form of a program, and called by a certain processing element of the device to execute the function of the unit. Here, the processing element can also be called a processor, which can be an integrated circuit with signal processing capabilities. In the implementation process, each step of the above method or each unit above can be implemented by the integrated logic circuit of the hardware in the processor element or in the form of software called through the processing element.

[0329] In one example, the unit in any of the above devices may be one or more integrated circuits configured to implement the above method, such as one or more application specific integrated circuits (ASICs), or one or more digital signal processors (DSPs), or one or more field programmable gate arrays (FPGAs), or a combination of at least two of these integrated circuit forms. For another example, when the unit in the device can be implemented in the form of a processing element scheduler, the processing element may be a general-purpose processor, such as a central processing unit (CPU) or other processor that can call a program. For another example, these units can be integrated together and implemented in the form of a system-on-a-chip (SOC).

[0330] Figure 21 is a structural diagram of a network device 2100 provided in an embodiment of the present application, which can be used to implement the functions of the network device in the above method. The network device 2100 includes one or more radio frequency units, such as a remote radio unit (RRU) 2101 and one or more baseband units (BBU) (also known as digital units, DU) 2102. The RRU 2101 can be called a transceiver unit, a transceiver, a transceiver circuit, or a transceiver, etc., and may include at least one antenna 21011 and a radio frequency unit 21012. The RRU 2101 part is mainly used for receiving and transmitting radio frequency signals and converting radio frequency signals into baseband signals, for example, for sending signaling messages in the above embodiment to terminal devices. The BBU 2102 part is mainly used for baseband processing, controlling the base station, etc. The RRU 2101 and BBU 2102 can be physically set together or physically separated, that is, a distributed base station.

[0331] The BBU 2102 is the control center of the base station, which can also be called a processing unit. It is mainly used to perform baseband processing functions such as channel coding, multiplexing, modulation, spread spectrum, etc. For example, the BBU (processing unit) 2102 can be used to control the base station to execute the operation process of the network device in the above method embodiment.

[0332] In one example, the BBU 2102 may be composed of one or more single boards, and the multiple single boards may jointly support a wireless access network of a single access standard (such as an LTE system or a 5G system), or may respectively support wireless access networks of different access standards. The BBU 2102 also includes a memory 21021 and a processor 21022. The memory 21021 is used to store necessary instructions and data. For example, the memory 21021 stores the codebook in the above embodiment, etc. The processor 21022 is used to control the base station to perform necessary actions, such as controlling the base station to execute the operation process of the network device in the above method embodiment. The memory 21021 and the processor 21022 can serve one or more single boards. That is, a memory and a processor can be set separately on each single board. Alternatively, multiple single boards may share the same memory and processor. In addition, necessary circuits may be provided on each single board.

[0333] In one possible implementation, with the development of system-on-chip (SoC) technology, all or part of the functions of parts 2102 and 2101 can be implemented using SoC technology. For example, they can be implemented using a base station function chip that integrates a processor, memory, antenna interface, and other components. Programs for base station-related functions are stored in the memory, and the processor executes the programs to implement the base station-related functions. Optionally, the base station function chip can also read memory external to the chip to implement the base station-related functions.

[0334] It should also be understood that the division of units in the above device is merely a division of logical functions. In actual implementation, they can be fully or partially integrated into one physical entity, or they can be physically separated. Moreover, the units in the device can all be implemented in the form of software called through processing elements; or all be implemented in the form of hardware; or some units can be implemented in the form of software called through processing elements, and some units can be implemented in the form of hardware. For example, each unit can be a separately established processing element, or it can be integrated into a certain chip of the device. In addition, it can also be stored in a memory in the form of a program, and called by a certain processing element of the device to execute the function of the unit. Here, the processing element can also be called a processor, which can be an integrated circuit with signal processing capabilities. In the implementation process, each step of the above method or each unit above can be implemented by the integrated logic circuit of the hardware in the processor element or in the form of software called through the processing element. In one example, the unit in any of the above devices may be one or more integrated circuits configured to implement the above method, such as one or more application specific integrated circuits (ASICs), or one or more digital signal processors (DSPs), or one or more field programmable gate arrays (FPGAs), or a combination of at least two of these integrated circuit forms. For another example, when the unit in the device can be implemented in the form of a processing element scheduler, the processing element may be a general-purpose processor, such as a central processing unit (CPU) or other processor that can call a program. For another example, these units can be integrated together and implemented in the form of a system-on-a-chip (SOC).

[0335] An embodiment of the present application also provides a chip system, as shown in Figure 22, which includes at least one processor 2210 and at least one interface circuit 2220. The processor 2210 and the interface circuit 2220 can be interconnected via lines. For example, the interface circuit 2220 can be used to receive signals from other devices (such as the memory of the network device 2100). For another example, the interface circuit 2220 can be used to send signals to other devices (such as the processor 2210). Exemplarily, the interface circuit 2220 can read instructions stored in the memory and send the instructions to the processor 2210. When the instructions are executed by the processor 2210, the terminal device can execute the various steps performed by the terminal device in the above embodiment. Of course, the chip system can also include other discrete components, which is not specifically limited in the embodiment of the present application.

[0336] The present application also provides a computer-readable storage medium for storing computer program code, wherein the computer program includes instructions for executing any of the communication methods provided in the embodiments of the present application. The computer-readable storage medium may be a read-only memory (ROM) or a random access memory (RAM), which is not limited in the present application.

[0337] The present application also provides a computer program product, which includes instructions. When the instructions are executed, the network device and the terminal device perform corresponding operations in the above method.

[0338] The present application also provides a chip in a communication device, comprising a processing unit and a communication unit. The processing unit may be, for example, a processor, and the communication unit may be, for example, an input / output interface, a pin, or a circuit. The processing unit may execute computer instructions to cause the communication device to perform any of the communication methods provided in the embodiments of the present application.

[0339] Optionally, the computer instructions are stored in a storage unit.

[0340] Optionally, the storage unit is a storage unit within the chip, such as a register, cache, etc. The storage unit can also be a storage unit located outside the chip within the terminal, such as a ROM or other type of static storage device that can store static information and instructions, random access RAM, etc. The processor mentioned in any of the above can be a CPU, a microprocessor, an ASIC, or one or more integrated circuits for controlling the execution of the program of the above-mentioned feedback information transmission method. The processing unit and the storage unit can be decoupled and respectively set on different physical devices, and connected by wired or wireless means to implement the respective functions of the processing unit and the storage unit to support the system chip to implement the various functions in the above-mentioned embodiments. Alternatively, the processing unit and the memory can also be coupled on the same device.

[0341] Among them, the terminal device, computer-readable storage medium, computer program product or chip provided in this embodiment are all used to execute the corresponding methods provided above. Therefore, the beneficial effects that can be achieved can refer to the beneficial effects in the corresponding methods provided above, and will not be repeated here.

[0342] It will be appreciated that the memory in the embodiments of the present application may be a volatile memory or a non-volatile memory, or may include both volatile and non-volatile memories. Among them, the non-volatile memory may be a ROM, a programmable read-only memory (PROM), an erasable programmable read-only memory (EPROM), an electrically erasable programmable read-only memory (EEPROM), or a flash memory. The volatile memory may be a RAM, which is used as an external cache. There are many different types of RAM, such as static random access memory (SRAM), dynamic random access memory (DRAM), synchronous dynamic random access memory (SDRAM), double data rate synchronous dynamic random access memory (DDR SDRAM), enhanced synchronous dynamic random access memory (ESDRAM), synchronous link dynamic random access memory (SLDRAM), and direct rambus RAM (DR RAM).

[0343] Various objects such as various messages / information / equipment / network elements / systems / devices / actions / operations / processes / concepts that may appear in this application are named. It can be understood that these specific names do not constitute a limitation on the relevant objects. The names assigned may change with factors such as scenarios, contexts or usage habits. The understanding of the technical meaning of the technical terms in this application should be mainly determined from the functions and technical effects embodied / executed in the technical solutions.

[0344] In the various embodiments of the present application, unless otherwise specified or there is a logical conflict, the terms and / or descriptions between different embodiments are consistent and can be referenced by each other. The technical features in different embodiments can be combined to form new embodiments according to their inherent logical relationships.

[0345] Those skilled in the art will appreciate that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professional and technical personnel can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of this application.

[0346] The methods in the embodiments of the present application can be implemented in whole or in part by software, hardware, firmware or any combination thereof. When implemented using software, they can be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer programs or instructions. When the computer program or instructions are loaded and executed on a computer, the processes or functions described in the embodiments of the present application are executed in whole or in part. The computer can be a general-purpose computer, a special-purpose computer, a computer network, or other programmable devices. The computer program or instructions can be stored in a computer-readable storage medium or transmitted via the computer-readable storage medium. 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 that integrates one or more available media.

[0347] Those skilled in the art will clearly understand that, for the convenience and brevity of description, the specific working processes of the systems, devices and units described above can refer to the corresponding processes in the aforementioned method embodiments and will not be repeated here.

[0348] In the several embodiments provided in this application, it should be understood that the disclosed systems, devices and methods can be implemented in other ways. For example, the device embodiments described above are merely schematic. For example, the division of the units is merely a logical function division. In actual implementation, there may be other division methods, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of devices or units, which can be electrical, mechanical or other forms.

[0349] The units described as separate components may or may not be physically separate, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed across multiple network units. Some or all of these units may be selected to achieve the purpose of this embodiment according to actual needs.

[0350] In addition, each functional unit in each embodiment of the present application may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit.

[0351] If the functions are implemented in the form of software functional units and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present application, or the part that contributes to the prior art, or the part of the technical solution, can be embodied in the form of a software product. The computer software product is stored in a readable storage medium and includes several instructions for enabling a computer device (which can be a personal computer, server, or network device, etc.) to execute all or part of the steps of the method described in each embodiment of the present application. The aforementioned readable storage medium includes various media that can store program codes, such as a USB flash drive, a mobile hard disk, a ROM, a RAM, a magnetic disk, or an optical disk.

Claims

1. A communication method, characterized in that: The method comprises: Determine the subcarrier spacing of N first symbols, where the subcarrier spacing of each first symbol includes any one of the following: 20·2 φ kHz, 16.2 φ kHz and 19.2·2 φ kHz, where φ is a positive integer; At least one of data and a reference signal is sent or received using the N first symbols.

2. The method according to claim 1, characterized in that The total length of the first symbols with the same subcarrier spacing in the N first symbols is the same as the length of one second symbol.

3. The method according to claim 1 or 2, characterized in that: N=2 n , n is a positive integer.

4. The method according to any one of claims 1 to 3, characterized in that The Fourier transform size of each first symbol in the N first symbols satisfies: A=2 α *3 β *5 γ *7 θ Wherein, A represents the size of the Fourier transform of the first symbol, and α, β, γ and θ are non-negative integers.

5. The method according to claim 2, characterized in that: The difference between the length of each first symbol excluding the cyclic prefix CP and the first value is less than or equal to the first threshold, and the first value satisfies the following calculation formula: Wherein, B represents the first value, L D represents the length of the second symbol excluding CP, L CP represents the length of the second symbol CP, and N represents the number of first symbols.

6. The method according to claim 5, characterized in that The first threshold is related to at least one of a subcarrier spacing of the second symbol and the number of the first symbols.

7. The method according to any one of claims 1 to 6, characterized in that The length of each of the first symbols is the same except for the CP, and the CP length of each of the first symbols is the same.

8. The method according to any one of claims 1 to 7, characterized in that The subcarrier width of the second symbol is 15·2 μ kHz, where μ=φ-n and μ is a non-negative integer.

9. The method according to any one of claims 1 to 8, characterized in that When the subcarrier spacing of each first symbol is 20·2 μ+n kHz, the length of each first symbol excluding the CP and the length of each first symbol CP are calculated according to the following formula: s,D =1536·κ 6G 2 -μ-n Among them, L s,D represents the length of each first symbol excluding CP, L s,CP represents the length of each first symbol CP, l represents the position of the second symbol in a subframe, κ 6G =2 n1 , n1≥6, n1 is an integer.

10. The method according to any one of claims 1 to 8, characterized in that When each first symbol subcarrier interval is When the length of each first symbol excluding the CP and the length of each first symbol CP are calculated according to the following formula: s,D =1792·κ 6G 2 -μ-n Among them, L s,D represents the length of each first symbol excluding CP, L s,CP represents the length of each first symbol CP, l represents the position of the second symbol in a subframe, κ 6G =2 n1 , n1≥6, n1 is an integer.

11. The method according to any one of claims 1 to 8, characterized in that When the subcarrier spacing of each first symbol is 16·2 μ+n kHz, the length of each first symbol excluding the CP and the length of each first symbol CP are calculated according to the following formula: s,D =1920·κ 6G 2 -μ-n Among them, L s,D represents the length of each first symbol excluding CP, L s,CP represents the length of each first symbol CP, l represents the position of the second symbol in a subframe, κ 6G =2 n1 , n1≥6, n1 is an integer.

12. The method according to any one of claims 1 to 8, characterized in that When the subcarrier spacing of each first symbol is 19.2·2 μ+n kHz, the length of each first symbol excluding the CP and the length of each first symbol CP are calculated according to the following formula: s,D =1600·κ 6G 2 -μ-n Among them, L s,D represents the length of each first symbol excluding CP, L s,CP represents the length of each first symbol CP, l represents the position of the second symbol in a subframe, κ 6G =2 n1 , n1≥6, n1 is an integer.

13. A communication device, characterized in that: The communication device comprises: A processing unit, the processing unit is used to determine the subcarrier spacing of N first symbols, and the subcarrier spacing of each first symbol includes any one of the following: 20·2 φ kHz, 16.2 φ kHz and 19.2·2 φ kHz, where φ is a positive integer; A transceiver unit, wherein the transceiver unit is used to send or receive at least one of data and a reference signal using the N first symbols.

14. The device according to claim 13, characterized in that The total length of the first symbols with the same subcarrier spacing in the N first symbols is the same as the length of one second symbol.

15. The device according to claim 13 or 14, characterized in that N=2 n , n is a positive integer.

16. The device according to any one of claims 13 to 15, characterized in that The Fourier transform size of each first symbol in the N first symbols satisfies: A=2 α *3 β *5 γ *7 θ Wherein, A represents the size of the Fourier transform of the first symbol, and α, β, γ and θ are non-negative integers.

17. The device according to claim 14, characterized in that The difference between the length of each first symbol excluding the cyclic prefix CP and the first value is less than or equal to the first threshold, and the first value satisfies the following calculation formula: Wherein, B represents the first value, L D represents the length of the second symbol excluding CP, L CP represents the length of the second symbol CP, and N represents the number of first symbols.

18. The device according to claim 17, characterized in that The first threshold is related to at least one of a subcarrier spacing of the second symbol and the number of the first symbols.

19. The device according to any one of claims 13 to 18, characterized in that The length of each of the first symbols is the same except for the CP, and the CP length of each of the first symbols is the same.

20. The device according to any one of claims 13 to 19, characterized in that The subcarrier width of the second symbol is 15·2 μ kHz, where μ=φ-n and μ is a non-negative integer.

21. The device according to any one of claims 13 to 20, characterized in that When the subcarrier spacing of each first symbol is 20·2 μ+n kHz, the length of each first symbol excluding the CP and the length of each first symbol CP are calculated according to the following formula: s,D =1536·κ 6G 2 -μ-n Among them, L s,D represents the length of each first symbol excluding CP, L s,CP represents the length of each first symbol CP, l represents the position of the second symbol in a subframe, κ 6G =2 n1 , n1≥6, n1 is an integer.

22. The device according to any one of claims 13 to 20, characterized in that When each first symbol subcarrier interval is When the length of each first symbol excluding the CP and the length of each first symbol CP are calculated according to the following formula: s,D =1792·κ 6G 2 -μ-n Among them, L s,D represents the length of each first symbol excluding CP, L s,CP represents the length of each first symbol CP, l represents the position of the second symbol in a subframe, κ 6G =2 n1 , n1≥6, n1 is an integer.

23. The device according to any one of claims 13 to 20, characterized in that When the subcarrier spacing of each first symbol is 16·2 μ+n kHz, the length of each first symbol excluding the CP and the length of each first symbol CP are calculated according to the following formula: s,D =1920·κ 6G 2 -μ-n Among them, L s,D represents the length of each first symbol excluding CP, L s,CP represents the length of each first symbol CP, l represents the position of the second symbol in a subframe, κ 6G =2 n1 , n1≥6, n1 is an integer.

24. The device according to any one of claims 13 to 20, characterized in that When the subcarrier spacing of each first symbol is 19.2·2 μ+n kHz, the length of each first symbol excluding the CP and the length of each first symbol CP are calculated according to the following formula: s,D =1600·κ 6G 2 -μ-n Among them, L s,D represents the length of each first symbol excluding CP, L s,CP represents the length of each first symbol CP, l represents the position of the second symbol in a subframe, κ 6G =2 n1 , n1≥6, n1 is an integer.

25. A communication device, characterized in that: The apparatus comprises at least one processor coupled to at least one memory: The at least one processor is configured to execute a computer program or instruction in the at least one memory so that the method according to any one of claims 1 to 12 is performed.

26. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores a computer program or instructions. When a computer reads and executes the computer program or instructions, the method according to any one of claims 1 to 12 is executed.

27. A chip system, characterized in that: The method comprises: a processor, configured to call and run a computer program from a memory, so that the method according to any one of claims 1 to 12 is executed.

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