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EP-4221034-B1 - REFERENCE SIGNAL TRANSMISSION METHOD AND DEVICE, COMMUNICATION NODE, AND STORAGE MEDIUM

EP4221034B1EP 4221034 B1EP4221034 B1EP 4221034B1EP-4221034-B1

Inventors

  • BAO, Tong
  • XIN, YU

Dates

Publication Date
20260506
Application Date
20210908

Claims (14)

  1. A reference signal transmission method by a communication node, comprising: transmitting (110) a first reference signal through first H symbols of a physical resource block in a time domain, wherein H is greater than or equal to 2; and transmitting (120) a second reference signal through last T symbols of the physical resource block in the time domain, wherein T is greater than or equal to H; wherein each slot comprises L physical resource blocks, wherein L is greater than or equal to 2; a number of symbols contained in each of P physical resource blocks is equal to a sum of T and H, and a number of symbols contained in each of L-P physical resource blocks is greater than the sum of T and H, wherein P is greater than or equal to 0 and less than or equal to L; wherein the reference signal transmission method is characterized in that , the L physical resource blocks, at least two physical resource blocks adjacent in a time domain have the same first reference signal in the first H symbols of each of said adjacent physical resource blocks; and at least two physical resource blocks adjacent in the time domain have the same second reference signal in the last T symbols of each of said adjacent physical resource blocks.
  2. The method of claim 1, wherein an i th physical resource block in each slot consists of M i symbols in the time domain and K i subcarriers in a frequency domain, wherein M i is greater than or equal to a sum of T and H, K i is greater than or equal to 1, and i is a positive integer less than or equal to L.
  3. The method of claim 2, wherein when P is equal to 0, in each physical resource block in each slot, first H symbols in the time domain are configured for transmission of the first reference signal, last T symbols in the time domain are configured for transmission of the second reference signal, and a symbol other than the first H symbols and the last T symbols in the time domain is configured for transmission of related information; when P is equal to L, in each physical resource block in each slot, first H symbols in the time domain are configured for transmission of the first reference signal and last T symbols in the time domain are configured for transmission of the second reference signal, and no related information is contained in the each physical resource block; or when P is greater than 0 and less than L, in each of the P physical resource blocks in each slot, first H symbols in the time domain are configured for transmission of the first reference signal and last T symbols in the time domain are configured for transmission of the second reference signal, and no related information is contained in the each of the P physical resource blocks; and in each of the L-P physical resource blocks in each slot, first H symbols in the time domain are configured for the transmission of the first reference signal, last T symbols in the time domain are configured for the transmission of the second reference signal, and a symbol other than the first H symbols and the last T symbols in the time domain is configured for transmission of related information, wherein the related information comprises at least one of traffic data or a third reference signal.
  4. The method of claim 2, wherein the L physical resource blocks in each slot contain a same number of subcarriers and have a same subcarrier spacing.
  5. The method of claim 1, further comprising: performing an inverse fast Fourier transform, IFFT, on frequency-domain data of each symbol of the physical resource block to obtain oversampled time-domain data of the each symbol; modulating the oversampled time-domain data of each symbol by using a waveform function, wherein an interval of an independent variable of the waveform function has a length of a product of N and T1, and a modulated time-domain data sequence of each symbol has a length of the product of N and T1, wherein N is a real number greater than 1, and T1 is a positive number; and sequentially delaying the modulated time-domain data sequence of each symbol by T1 based on a time-domain data sequence of a previous symbol adjacent to the each symbol so that a spacing between adjacent symbols of the physical resource block is T1; and superposing the delayed time-domain data sequence of each symbol.
  6. The method of claim 5, wherein T1 is greater than T0, or T1 is less than or equal to T0, wherein T0 is a reciprocal of a subcarrier spacing; when T1 is greater than T0, T1 is a times T0, wherein a has a value range of [15/14, 2] or [8/7, 2].
  7. The method of claim 5, further comprising: adding zero data to a plurality of subcarriers on two sides of subcarriers in the physical resource block in a frequency domain.
  8. The method of claim 5, wherein the waveform function comprises one of a root raised cosine function, a raised cosine function, a piecewise function, or a rectangular function, wherein the raised cosine function is a time-domain raised cosine function or is a time-domain function transformed from a frequency-domain raised cosine function by using the IFFT; the root raised cosine function is a time-domain root raised cosine function or is a time-domain function transformed from a frequency-domain root raised cosine function by using the IFFT; and a non-zero function value of the piecewise function is represented by a combination of a plurality of data expressions in different intervals of the independent variable.
  9. The method of claim 5, wherein a maximum time span of the interval of the independent variable corresponding to a non-zero function value of the waveform function is greater than T1; or a maximum time span of the interval of the independent variable corresponding to a non-zero function value of the waveform function is equal to 5T1.
  10. The method of claim 5, wherein modulating the oversampled time-domain data of each symbol by using the waveform function comprises: copying the oversampled time-domain data of each symbol every T0 to obtain a data sequence that corresponds to the each symbol and whose length is the product of N and T1, wherein T0 is a reciprocal of a subcarrier spacing; and calculating a dot product of a discrete function value of the waveform function and the data sequence that corresponds to each symbol and whose length is the product of N and T1 to obtain a corresponding waveform-modulated time-domain data sequence whose length is the product of N and T1.
  11. The method of claim 10, wherein the waveform function is a continuous function, wherein the discrete function value of the waveform function is obtained by sampling values of the continuous function, wherein an interval of the sampling is equal to a time interval between adjacent discrete data in the time-domain data of each symbol; or the waveform function is a discrete function, wherein a number of discrete function values of the waveform function is the same as a number of pieces of discrete data in the time-domain data sequence that corresponds to each symbol and whose length is the product of N and T1.
  12. The method of claim 5, wherein the L physical resource blocks in each slot are modulated using a same waveform function; and physical resource blocks in different slots are modulated using a same waveform function or different waveform functions.
  13. A communication node, comprising: at least one processor; and a storage apparatus configured to store at least one program, wherein when the at least one program is executed by the at least one processor, the at least one processor performs the reference signal transmission method of any one of claims 1 to 12.
  14. A computer-readable storage medium storing a computer program which, when executed by a computer, causes the computer to perform the reference signal transmission method of any one of claims 1 to 12.

Description

TECHNICAL FIELD The present application relates to the field of wireless communication networks, for example, a reference signal transmission method, a communication node, and a storage medium. BACKGROUND Long term evolution (LTE) uses the technology of orthogonal frequency division multiplexing (OFDM), and time-frequency resources composed of subcarriers and OFDM symbols constitute wireless physical time-frequency resources of an LTE system. In the technology of OFDM, a cyclic prefix (CP) can well solve the problem of multipath delay of a CP-OFDM system, but a CP-OFDM spectrum has a large out-of-band leakage, making CP-OFDM sensitive to frequency and time offsets between adjacent subbands, easily causing inter-subband interference. An LTE system uses guard intervals in the frequency domain, resulting in a lower spectral efficiency. Therefore, new technologies are required to suppress the out-of-band leakage. As a carrier frequency in a terahertz scenario increases, phase noise becomes larger, but the design of a phase tracking reference signal (PTRS) cannot satisfy the requirement for estimation of larger phase noise in the terahertz scenario. US 9 325 470 B2 discloses a method and device for sending a pilot signal. US 2021/0020890 A1 discloses a method of allocating pilot subcarriers in a resource block for a wideband wireless mobile communication system with multiple transmission antennas using orthogonal frequency division multiplexing modulation. CN 101 340 228 A discloses a transmission method for reference signals. CN 107 612 859 A discloses a signal transmission method. SUMMARY The present application provides a reference signal transmission method, a communication node, and a storage medium to satisfy the requirement for estimating the phase noise and improve the demodulation performance of a receiving end. The present application is set out in the appended claims. BRIEF DESCRIPTION OF DRAWINGS FIG. 1 is a flowchart of a reference signal transmission method according to an embodiment.FIG. 2 is a diagram illustrating transmission of reference signals through physical resource blocks according to an embodiment.FIG. 3 is a diagram illustrating transmission of reference signals through physical resource blocks according to another embodiment.FIG. 4 is a diagram illustrating transmission of reference signals through physical resource blocks according to another embodiment.FIG. 5 is a diagram illustrating transmission of reference signals through physical resource blocks according to another embodiment.FIG. 6 is a diagram illustrating transmission of reference signals through physical resource blocks according to another embodiment.FIG. 7 is a diagram illustrating transmission of reference signals through physical resource blocks according to another embodiment.FIG. 8 is a diagram illustrating modulation of Mi symbols of a physical resource block in the time domain according to an embodiment.FIG. 9 is a diagram illustrating superposition of time-domain data sequences of Mi symbols according to an embodiment.FIG. 10 is a diagram of waveform functions according to an embodiment.FIG. 11 is a block diagram of a reference signal transmission apparatus according to an embodiment.FIG. 12 is a diagram illustrating the hardware structure of a communication node according to an embodiment. DETAILED DESCRIPTION The present application is described hereinafter in conjunction with drawings and embodiments. The embodiments described herein are intended to explain the present application. For ease of description, the drawings illustrate only parts related to the present application. In an embodiment of the present application, a reference signal transmission method is provided. The method is applicable to a communication node. The communication node may be, for example, a base station, an access point (AP), a transmission receive point (TRP), or a user equipment (UE). For example, a UE is used as a sending end of a reference signal to send a first reference signal through the first H (H ≥ 2) symbols of each physical resource block and send a second reference signal through the last T (T ≥ H) symbols of each physical resource block; and a base station is used as a receiving end of a reference signal to receive corresponding reference signals through the first H symbols and the last T symbols of each physical resource block. The first reference signal and the second reference signal are used by the receiving end to perform, for example, phase noise estimation and compensation, frequency offset correction, auxiliary channel estimation, and auxiliary synchronization to satisfy the requirement for estimation of the phase noise, thereby improving the demodulation performance of the receiving end. FIG. 1 is a flowchart of a reference signal transmission method according to an embodiment. The method is applicable to a communication node. As shown in FIG. 1, the method of this embodiment includes 110 and 120. In 110, a first re