Demodulation reference signal receiving method and apparatus, and demodulation reference signal sending method and apparatus

Abstract

Provided in the embodiments of the present application are a demodulation reference signal (DMRS) receiving method and apparatus, and a DMRS sending method and apparatus, which are used to realize flexible adjustment of the frequency-domain density of a DMRS, enabling adjustment (e.g., reduction) of the frequency-domain density of a DMRS when channel frequency selectivity is low, so as to avoid the waste of DMRS resources, thereby improving the utilization rate of the DMRS resources. The DMRS receiving method provided in the present application comprises: receiving first indication information from a network device, wherein the first indication information indicates an adjustment amount for adjusting the frequency-domain density of a DMRS; on the basis of the type of the DMRS and the first indication information, determining frequency-domain resources occupied by the DMRS, wherein the type of the DMRS is type 1 or type 2; and receiving the DMRS from the network device by means of the frequency-domain resources occupied by the DMRS.

Description

Demodulation reference signal receiving method, demodulation reference signal transmitting method and apparatus

[0001] This application claims priority to Chinese Patent Application No. 202410790255.6, filed on June 18, 2024, entitled "Method for Receiving Demodulation Reference Signal, Method for Transmitting Demodulation Reference Signal, and Apparatus", the entire contents of which are incorporated herein by reference. Technical Field

[0002] This application relates to the field of communication technology, and in particular to a method for receiving a demodulation reference signal (DMRS), a method for transmitting a DMRS, and an apparatus. Background Technology

[0003] DMRS is used for channel estimation and data demodulation. The receiving device uses DMRS for wireless channel estimation and demodulation of related physical channels. Except for the Physical Random Access Channel (PRACH), other physical channels have corresponding DMRS transmissions. For example, the Physical Downlink Shared Channel (PDSCH) is accompanied by DMRS transmission.

[0004] Based on frequency domain resources, DMRS can be divided into Type 1 and Type 2. The frequency domain density of Type 1 DMRS is 1 / 2, and that of Type 2 DMRS is 1 / 3. Therefore, the frequency domain density of DMRS is relatively uniform, and in situations with weak channel frequency selectivity, a large frequency domain density can lead to a waste of DMRS resources. Summary of the Invention

[0005] This application provides a DMRS receiving method, a DMRS transmitting method, and an apparatus for flexibly adjusting the frequency domain density of the DMRS. In situations where channel frequency selectivity is weak, the frequency domain density of the DMRS can be adjusted (e.g., reduced) to avoid wasting DMRS resources, thereby improving the utilization rate of DMRS resources.

[0006] This application provides a DMRS receiving method in its first aspect. This method can be used on the terminal side, for example, executed by a terminal device. The terminal device can be a device or apparatus with a chip, or a device or apparatus with integrated circuitry, or a chip, chip system, module, or control unit in the aforementioned device or apparatus; specific details are not limited in this application. It should be noted that in this application, the term "terminal device" can refer to the terminal device itself, or to the chip, functional module, or integrated circuit within the terminal device that performs the method provided in this application; specific details are not limited in this application. In the first aspect and its possible implementations, the method is described using an example of execution by a terminal device. The method includes: the terminal device receiving first indication information from a network device, the first indication information indicating an adjustment amount for adjusting the frequency domain density of the DMRS, or the first indication information indicating an adjustment amount for the frequency domain density of the DMRS; the terminal device determining the frequency domain resources occupied by the DMRS according to the type of the DMRS and the first indication information, the type of the DMRS being type 1 or type 2; and the terminal device receiving the DMRS from the network device through the frequency domain resources occupied by the DMRS. In other words, the terminal device determines the frequency domain density of the DMRS based on the type of the DMRS and the first indication information, wherein the type of the DMRS is type 1 or type 2; the terminal device determines the frequency domain resources occupied by the DMRS based on the frequency domain density of the DMRS; and the terminal device receives the DMRS from the network device through the frequency domain resources occupied by the DMRS.

[0007] Therefore, the terminal device receives first indication information from the network device, which indicates the adjustment amount for adjusting the frequency domain density of the DMRS. This enables flexible adjustment of the DMRS frequency domain density. The terminal device determines the frequency domain resources occupied by the DMRS based on the DMRS type and the first indication information, and then receives the DMRS from the network device using those resources. This allows for adjustment (e.g., reduction) of the DMRS frequency domain density even in situations with weak channel frequency selectivity, avoiding waste of DMRS resources and thus improving DMRS resource utilization.

[0008] The second aspect of this application provides a DMRS transmission method, which can be used on the network side, for example, executed by a network device. The network device can be a device or apparatus with a chip, or a device or apparatus with integrated circuitry, or a chip, chip system, module, or control unit in the aforementioned device or apparatus; specific details are not limited in this application. It should be noted that in this application, the term "network device" can refer to the network device itself, or to the chip, functional module, or integrated circuit within the network device that performs the method provided in this application; specific details are not limited in this application. In the second aspect and its possible implementations, the method is described using the execution of the method by a network device as an example. The method includes: the network device sending first indication information to a terminal device, the first indication information indicating an adjustment amount for adjusting the frequency domain density of the DMRS, or the first indication information indicating an adjustment amount for the frequency domain density of the DMRS; the network device determining the frequency domain resources occupied by the DMRS according to the type of the DMRS and the first indication information, the type of the DMRS being type 1 or type 2; and the network device transmitting the DMRS to the terminal device using the frequency domain resources occupied by the DMRS. In other words, the network device determines the frequency domain density of the DMRS based on the type of the DMRS and the first indication information, wherein the type of the DMRS is type 1 or type 2; the network device determines the frequency domain resources occupied by the DMRS based on the frequency domain density of the DMRS; and the network device sends the DMRS to the terminal device through the frequency domain resources occupied by the DMRS.

[0009] Therefore, the network device sends a first indication message to the terminal device, which indicates the adjustment amount for adjusting the frequency domain density of the DMRS. This enables flexible adjustment of the DMRS frequency domain density. The network device determines the frequency domain resources occupied by the DMRS based on the DMRS type and the first indication message, and then sends the DMRS to the terminal device using those resources. This allows for adjustment (e.g., reduction) of the DMRS frequency domain density even in situations with weak channel frequency selectivity, avoiding waste of DMRS resources and thus improving DMRS resource utilization.

[0010] Based on the first or second aspect, in one possible implementation, the adjustment amount is used to decrease or increase the frequency domain density of the DMRS. This allows for flexible adjustment of the DMRS frequency domain density. For example, in situations with weak channel frequency selectivity, network devices can reduce the DMRS frequency domain density, thereby avoiding waste of DMRS resources.

[0011] Based on the first or second aspect, in one possible implementation, the first indication information specifically indicates the sparsity of the frequency domain density of the DMRS. Alternatively, the adjustment amount is the sparsity. For cases where the frequency domain density of the DMRS is reduced, the first indication information can indicate the sparsity, thereby facilitating the terminal device in determining the frequency domain density of the DMRS.

[0012] Based on the first or second aspect, in one possible implementation, the frequency domain resources occupied by the DMRS include the resource elements (REs) occupied by the DMRS. When the type of the DMRS is type 1, the index of the REs occupied by the DMRS is... Alternatively, DMRS uses the RE index. n′ is the index of the symbol in the sequence used to generate DMRS, and the value of n′ ranges from 1 to 2. Y equals the length of the sequence, k′ equals 0 and 1, Δ equals 0 or 1, and p is the adjustment amount, which is greater than 0 and less than or equal to 1. This implementation illustrates a possible approach to determining the index of the RE occupied by the DMRS by combining the type of the DMRS and the first indication information. From the above formula, the range of n′ is... Therefore, since the adjustment amount p has a smaller range of n' values ​​compared to the range of n values ​​used when calculating the index of REs occupied by type 1 DMRS, and the value of k has decreased, it can be seen that the number of REs occupied by DMRS has decreased, that is, the REs occupied by DMRS have become sparser, thus reducing the frequency domain density of DMRS.

[0013] Based on the first or second aspect, in one possible implementation, the frequency domain resources occupied by the DMRS include the REs occupied by the DMRS. When the type of the DMRS is type 2, the index of the REs occupied by the DMRS is... Alternatively, DMRS uses the RE index. n′ is the index of the symbol in the sequence used to generate DMRS, and the value of n′ ranges from 1 to 2. Y equals the sequence length minus one, k′ equals 0 and 1, Δ equals 0, 2, or 4, and p is an adjustment value, greater than 0 and less than or equal to 1. This implementation illustrates another possible approach to determine the index of the RE occupied by the DMRS by combining the DMRS type and the first indication information. From the above formula, the range of n′ is... Therefore, due to the adjustment amount p, compared to the range of n values ​​used when calculating the index of REs occupied by type 2 DMRS, the range of n′ values ​​here is smaller, and the number of k values ​​has decreased. It can be seen that the number of REs occupied by DMRS has decreased, meaning the REs occupied by DMRS have become sparser, thus reducing the frequency domain density of DMRS.

[0014] Based on the first or second aspect, in one possible implementation, the frequency domain resources occupied by the DMRS include the REs occupied by the DMRS. When the DMRS type is type 1, the index k of the REs occupied by the DMRS is k = p(4n′) + 2k′ + Δ, or the index k of the REs occupied by the DMRS is k = p(4n′ + 2k′) + Δ, where n′ is the sequence number of the symbol used to generate the DMRS, and the value range of n′ is... Y equals the sequence length minus one, k′ equals 0 and 1, Δ equals 0 or 1, and p is the adjustment amount, where p is an integer greater than or equal to 1. This implementation illustrates a possible approach to determining the index of the RE occupied by the DMRS by combining the DMRS type and the first indication information. From the above formula, the range of n′ is... Therefore, due to the adjustment amount p, compared to the range of n values ​​used when calculating the index of REs occupied by type 1 DMRS, the range of n′ values ​​here is smaller, and the number of k values ​​decreases. It can be seen that the number of REs occupied by DMRS decreases, meaning the REs occupied by DMRS become sparser, thus reducing the frequency domain density of DMRS.

[0015] Based on the first or second aspect, in one possible implementation, the frequency domain resources occupied by the DMRS include the REs occupied by the DMRS. When the DMRS type is type 2, the index k of the REs occupied by the DMRS is k = p(6n′) + k′ + Δ, or the index k of the REs occupied by the DMRS is k = p(6n′ + k′) + Δ, where n′ is the sequence number of the symbol used to generate the DMRS, and the value range of n′ is... Y equals the sequence length, k′ equals 0 and 1, and Δ equals 0, 2, or 4. p is the adjustment amount, an integer greater than or equal to 1. This implementation illustrates a possible approach to determining the index of the RE occupied by the DMRS by combining the DMRS type and the first indication information. From the above formula, the range of n′ is... Therefore, due to the adjustment amount p, compared to the range of n values ​​used when calculating the index of REs occupied by type 2 DMRS, the range of n′ values ​​here is smaller, and the number of k values ​​decreases. It can be seen that the number of REs occupied by DMRS decreases, meaning the REs occupied by DMRS become sparser, thus reducing the frequency domain density of DMRS.

[0016] Based on the first or second aspect, in one possible implementation, the first indication information is carried in the DMRS configuration information or in downlink control information (DCI). This reuses existing signaling, eliminating the need to redefine new signaling to carry the first indication information, thus improving the practicality of the solution.

[0017] Based on the first aspect, in one possible implementation, the method further includes: the terminal device sending capability information to the network device, the capability information indicating at least one of the following: the frequency domain density of the DMRS that the terminal device supports measuring, or the range to which the frequency domain density of the DMRS that the terminal device supports measuring belongs. In this implementation, the terminal device can send capability information to the network device, thereby facilitating the network device to indicate a suitable frequency domain density of the DMRS for the terminal device based on the capability information.

[0018] Based on the second aspect, in one possible implementation, the method further includes: the network device receiving capability information from the terminal device, the capability information including at least one of the following: the frequency domain density of the DMRS that the terminal device supports measuring, or the range to which the frequency domain density of the DMRS that the terminal device supports measuring belongs. This facilitates the network device in indicating a suitable frequency domain density of the DMRS to the terminal device based on the capability information.

[0019] The third aspect of this application provides a DMRS receiving method, which can be used on the terminal side, for example, executed by a terminal device. The terminal device can be a device or apparatus with a chip, or a device or apparatus with integrated circuitry, or a chip, chip system, module, or control unit in the aforementioned device or apparatus; specific details are not limited in this application. It should be noted that, in this application, the term "terminal device" can refer to the terminal device itself, or to the chip, functional module, or integrated circuit within the terminal device that performs the method provided in this application; specific details are not limited in this application. In the third aspect and its possible implementations, the method is described using the example of execution by a terminal device. The method includes: a terminal device receiving second indication information from a network device, the second indication information indicating the type of DMRS, wherein the frequency domain density of the DMRS is different from the frequency domain density of type 1 DMRS, the frequency domain density of the DMRS is different from the frequency domain density of type 2 DMRS, or the type of the DMRS is different from both type 1 and type 2; the terminal device determining the frequency domain resources occupied by the DMRS according to the type of the DMRS, and the terminal device receiving the DMRS from the network device through the frequency domain resources occupied by the DMRS; or, the terminal device determining the frequency domain density of the DMRS according to the type of the DMRS, determining the frequency domain resources occupied by the DMRS according to the frequency domain density of the DMRS, and the terminal device receiving the DMRS from the network device through the frequency domain resources occupied by the DMRS.

[0020] Therefore, it can be seen that the terminal device receives second indication information from the network device. This second indication information indicates the type of DMRS, and the frequency domain density of the DMRS is different from that of type 1 DMRS and different from that of type 2 DMRS. It is clear that the network device indicates a new DMRS type to the terminal device, and the frequency domain density of this DMRS differs from both type 1 and type 2 DMRS. This allows for flexible adjustment of the DMRS frequency domain density. The terminal device determines the frequency domain resources occupied by the DMRS based on its type and receives the DMRS from the network device using those resources. This enables adjustment (e.g., reduction) of the DMRS frequency domain density even in situations with weak channel frequency selectivity, avoiding waste of DMRS resources and improving DMRS resource utilization.

[0021] The fourth aspect of this application provides a DMRS transmission method, which can be used on the network side, for example, executed by a network device. The network device can be a device or apparatus with a chip, or a device or apparatus with integrated circuitry, or a chip, chip system, module, or control unit within the aforementioned device or apparatus; specific details are not limited in this application. It should be noted that, in this application, the term "network device" can refer to the network device itself, or to the chip, functional module, or integrated circuit within the network device that performs the method provided in this application; specific details are not limited in this application. In the fourth aspect and its possible implementations, the method is described using the example of execution by a network device. The method includes: a network device sending second indication information to a terminal device, the second indication information indicating the type of DMRS, wherein the frequency domain density of the DMRS is different from that of type 1 DMRS, the frequency domain density of the DMRS is different from that of type 2 DMRS, or the type of the DMRS is different from both type 1 and type 2; the network device determining the frequency domain resources occupied by the DMRS according to the type of the DMRS, and the network device sending the DMRS to the terminal device through the frequency domain resources occupied by the DMRS; or, the network device determining the frequency domain density of the DMRS according to the type of the DMRS, the network device determining the frequency domain resources occupied by the DMRS according to the frequency domain density of the DMRS, and the network device sending the DMRS to the terminal device through the frequency domain resources occupied by the DMRS.

[0022] Therefore, it can be seen that the network device sends a second indication information to the terminal device, which indicates the type of DMRS. The frequency domain density of the DMRS is different from that of type 1 DMRS, and it is also different from that of type 2 DMRS. This indicates that the network device has indicated a new DMRS type to the terminal device, and the frequency domain density of this DMRS differs from both type 1 and type 2 DMRS. This allows for flexible adjustment of the DMRS frequency domain density. The network device determines the frequency domain resources occupied by the DMRS based on its type and sends the DMRS to the terminal device using those resources. This allows for adjustment (e.g., reduction) of the DMRS frequency domain density even in situations with weak channel frequency selectivity, avoiding waste of DMRS resources and thus improving the utilization rate of DMRS resources.

[0023] Based on the third or fourth aspect, in one possible implementation, the frequency domain resources occupied by the DMRS include the REs occupied by the DMRS; when the frequency domain density of the DMRS is p times the frequency domain density of type 1 DMRS, where p is greater than 0 and less than or equal to 1, the index of the REs occupied by the DMRS is... Alternatively, DMRS uses the RE index. n′ is the index of the symbol in the sequence used to generate DMRS, and the value of n′ ranges from 1 to 2. Y equals the sequence length minus one, k′ equals 0 and 1, and Δ equals 0 or 1. Therefore, this shows a specific method for calculating the index of REs occupied by the DMRS when the frequency domain density of the DMRS is p times that of the type 1 DMRS. From the above formula, the range of n′ is... Compared to the range of n values ​​used when calculating the index of REs occupied by type 1 DMRS, the range of n′ values ​​here is smaller, and the value of k has decreased. It can be seen that the number of REs occupied by DMRS has decreased, that is, the REs occupied by DMRS have become sparser, thus reducing the frequency domain density of DMRS.

[0024] Based on the third or fourth aspect, in one possible implementation, the frequency domain resources occupied by the DMRS include the REs occupied by the DMRS; when the frequency domain density corresponding to the type of DMRS is p times the frequency domain density of type 2 DMRS, where p is greater than 0 and less than or equal to 1, the index of the REs occupied by the DMRS is... Alternatively, DMRS uses the RE index. n′ is the index of the symbol in the sequence used to generate DMRS, and the value of n′ ranges from 1 to 2. Y equals the sequence length minus one, k′ equals 0 and 1, and Δ equals 0, 2, or 4. Therefore, when the frequency domain density corresponding to a certain type of DMRS is p times that of type 2 DMRS, this shows a specific method for calculating the index of REs occupied by DMRS. From the above formula, the range of n′ is... Compared to the range of n values ​​used when calculating the index of REs occupied by type 2 DMRS, the range of n′ values ​​here is smaller, and the value of k has decreased. It can be seen that the number of REs occupied by DMRS has decreased, that is, the REs occupied by DMRS have become sparser, thus reducing the frequency domain density of DMRS.

[0025] Based on the third or fourth aspect, in one possible implementation, the frequency domain resources occupied by the DMRS include the REs occupied by the DMRS; when the frequency domain density corresponding to the type of the DMRS is 1 / p times the frequency domain density of type 1 DMRS, where p is an integer greater than or equal to 1, the index k of the REs occupied by the DMRS is k = p(4n′) + 2k′ + Δ, or, the index k of the REs occupied by the DMRS is k = p(4n′ + 2k′) + Δ, where n′ is the sequence number of the symbol used to generate the DMRS, and the value range of n′ is... Y equals the sequence length minus one, k′ equals 0 and 1, and Δ equals 0 or 1. Therefore, when the frequency domain density corresponding to a certain type of DMRS is 1 / p times that of type 1 DMRS, this demonstrates a specific method for calculating the RE occupied by DMRS. From the above formula, the range of n′ is... Compared to the range of n values ​​used when calculating the index of REs occupied by type 1 DMRS, the range of n′ values ​​here is smaller, and the value of k has decreased. It can be seen that the number of REs occupied by DMRS has decreased, that is, the REs occupied by DMRS have become sparser, thus reducing the frequency domain density of DMRS.

[0026] Based on the third or fourth aspect, in one possible implementation, the frequency domain resources occupied by the DMRS include the REs occupied by the DMRS; when the frequency domain density corresponding to the type of DMRS is 1 / p times the frequency domain density of type 2 DMRS, where p is an integer greater than or equal to 1, the index k of the REs occupied by the DMRS is k = p(6n′) + k′ + Δ, or, the index k of the REs occupied by the DMRS is k = p(6n′ + k′) + Δ, where n′ is the sequence number of the symbol used to generate the DMRS, and the value range of n′ is... Y equals the length of the sequence minus one, k′ equals 0 and 1, and Δ equals 0, 2, or 4. Therefore, when the frequency domain density corresponding to a certain type of DMRS is 1 / p times that of type 2 DMRS, this demonstrates a specific method for calculating the RE occupied by DMRS. From the above formula, the range of n′ is... Compared to the range of n values ​​used when calculating the index of REs occupied by type 2 DMRS, the range of n′ values ​​here is smaller, and the value of k has decreased. It can be seen that the number of REs occupied by DMRS has decreased, that is, the REs occupied by DMRS have become sparser, thus reducing the frequency domain density of DMRS.

[0027] Based on the third or fourth aspect, one possible implementation involves carrying the second indication information within the DMRS configuration information or within the DCI. This reuses existing signaling, eliminating the need to redefine new signaling to carry the second indication information, thus improving the practicality of the solution.

[0028] Based on the third aspect, in one possible implementation, the method further includes: the terminal device sending capability information to the network device, the capability information indicating at least one of the following: the frequency domain density of the DMRS supported by the terminal device for measurement, the range to which the frequency domain density of the DMRS supported by the terminal device for measurement belongs, or the type of DMRS supported by the terminal device for measurement. In this implementation, the terminal device can send capability information to the network device, thereby facilitating the network device to indicate an appropriate frequency domain density of the DMRS for the terminal device based on the capability information.

[0029] Based on the fourth aspect, in one possible implementation, the method further includes: the network device receiving capability information from the terminal device, the capability information including at least one of the following: the frequency domain density of the DMRS that the terminal device supports measuring, the range to which the frequency domain density of the DMRS that the terminal device supports measuring belongs, or the type of DMRS that the terminal device supports measuring. This facilitates the network device in indicating a suitable frequency domain density of DMRS to the terminal device based on the capability information.

[0030] This application provides a DMRS receiving method in its fifth aspect. This method can be used on the terminal side, for example, executed by a terminal device. The terminal device can be a device or apparatus with a chip, or a device or apparatus with integrated circuitry, or a chip, chip system, module, or control unit within the aforementioned device or apparatus; specific details are not limited in this application. It should be noted that, in this application, the term "terminal device" can refer to either the terminal device itself or the chip, functional module, or integrated circuit within the terminal device that performs the method provided in this application; specific details are not limited in this application. In the fifth aspect and its possible implementations, the method is described using the example of execution by a terminal device. The method includes: a terminal device receiving first indication information from a network device, the first indication information indicating an adjustment amount for adjusting the frequency domain density of a DMRS; the terminal device determining the frequency domain density of a DMRS based on the type of the DMRS and the first indication information, wherein the DMRS is either type 1 DMRS or type 2 DMRS; the terminal device receiving the DMRS from the network device based on the frequency domain density of the DMRS, wherein the pattern corresponding to the frequency domain density of the DMRS includes: the DMRS occupying one or more time domain symbols; when the DMRS is type 1 DMRS, the number of resource elements (REs) occupied by the DMRS on each time domain symbol is less than the number of REs occupied on each time domain symbol in the pattern corresponding to the frequency domain density of type 1 DMRS; when the DMRS is type 2 DMRS, the number of REs occupied by the DMRS on each time domain symbol is less than the number of REs occupied on each time domain symbol in the pattern corresponding to the frequency domain density of type 2 DMRS.

[0031] Therefore, it can be seen that the terminal device receives first indication information from the network device, which indicates the adjustment amount for adjusting the frequency domain density of the DMRS. The terminal device determines the frequency domain density of the DMRS based on the DMRS type and the first indication information, and receives the DMRS from the network device according to the DMRS frequency domain density. The pattern corresponding to the frequency domain density of the DMRS includes: the DMRS occupying one or more time domain symbols; when the DMRS is type 1 DMRS, the number of resource elements (REs) occupied by the DMRS in each time domain symbol is less than the number of REs occupied in each time domain symbol in the pattern corresponding to the frequency domain density of type 1 DMRS; when the DMRS is type 2 DMRS, the number of REs occupied by the DMRS in each time domain symbol is less than the number of REs occupied in each time domain symbol in the pattern corresponding to the frequency domain density of type 2 DMRS. Therefore, the frequency domain density of the DMRS is reduced. This reduces the frequency domain density of the DMRS in situations with weak channel frequency selectivity, avoiding waste of DMRS resources and thus improving the utilization rate of DMRS resources.

[0032] The sixth aspect of this application provides a DMRS transmission method, which can be used on the network side, for example, executed by a network device. The network device can be a device or apparatus with a chip, or a device or apparatus with integrated circuitry, or a chip, chip system, module, or control unit within the aforementioned device or apparatus; specific details are not limited in this application. It should be noted that, in this application, the term "network device" can refer to the network device itself, or to the chip, functional module, or integrated circuit within the network device that performs the method provided in this application; specific details are not limited in this application. In the sixth aspect and its possible implementations, the method is described using the example of execution by a network device. The method includes: a network device sending first indication information to a terminal device, the first indication information indicating an adjustment amount for adjusting the frequency domain density of the DMRS; the network device determining the frequency domain density of the DMRS according to the type of the DMRS and the first indication information, wherein the DMRS is either type 1 DMRS or type 2 DMRS; the network device sending the DMRS to the terminal device according to the frequency domain density of the DMRS, wherein the pattern corresponding to the frequency domain density of the DMRS includes: the DMRS occupying one or more time domain symbols, wherein when the DMRS is type 1 DMRS, the number of REs occupied by the DMRS on each time domain symbol is less than the number of REs occupied on each time domain symbol in the pattern corresponding to the frequency domain density of type 1 DMRS; and when the DMRS is type 2 DMRS, the number of REs occupied by the DMRS on each time domain symbol is less than the number of REs occupied on each time domain symbol in the pattern corresponding to the frequency domain density of type 2 DMRS.

[0033] Therefore, the network device sends a first indication message to the terminal device, indicating the adjustment amount for adjusting the frequency domain density of the DMRS. The network device determines the frequency domain density of the DMRS based on the DMRS type and the first indication message; the DMRS is either type 1 DMRS or type 2 DMRS. The network device then sends the DMRS to the terminal device based on the frequency domain density. The pattern corresponding to the frequency domain density of the DMRS includes: the DMRS occupies one or more time-domain symbols. When the DMRS is type 1 DMRS, the number of REs occupied by the DMRS on each time-domain symbol is less than the number of REs occupied on each time-domain symbol in the pattern corresponding to the frequency domain density of type 1 DMRS; when the DMRS is type 2 DMRS, the number of REs occupied by the DMRS on each time-domain symbol is less than the number of REs occupied on each time-domain symbol in the pattern corresponding to the frequency domain density of type 2 DMRS. This allows for flexible adjustment of the frequency domain density of the DMRS. Thus, the frequency domain density of the DMRS is reduced. This reduces the frequency domain density of the DMRS in situations with weak channel frequency selectivity, avoiding waste of DMRS resources and improving the utilization rate of DMRS resources.

[0034] Based on the fifth or sixth aspect, in one possible implementation, when the DMRS is type 1 DMRS, the REs occupied by the DMRS in each time domain symbol overlap with those occupied by type 1 DMRS in each time domain symbol; or, when the DMRS is type 2 DMRS, the REs occupied by the DMRS in each time domain symbol overlap with those occupied by type 2 DMRS in each time domain symbol. Therefore, the REs occupied by the DMRS are either the same as or belong to the REs occupied by type 1 DMRS, or the same as or belong to the REs occupied by type 2 DMRS. This reduces the frequency domain density of the DMRS and avoids wasting DMRS resources.

[0035] Based on the fifth or sixth aspect, in one possible implementation, the REs occupied by DMRS in each time domain symbol are spaced at least two REs apart between two adjacent REs.

[0036] Based on the fifth or sixth aspect, in one possible implementation, when the DMRS type is type 1, the frequency domain density of the DMRS is equal to p times that of type 1 DMRS, where p is an adjustment amount, greater than 0 and less than 1; or, when the DMRS is type 2 DMRS, the frequency domain density of the DMRS is equal to p times that of type 2 DMRS, where p is an adjustment amount, greater than 0 and less than 1. This is achieved by indicating the adjustment amount p through the first indication information, thereby reducing the frequency domain density of the DMRS and avoiding waste of DMRS resources.

[0037] Based on the fifth or sixth aspect, in one possible implementation, when the DMRS type is type 1, the frequency domain density of the DMRS is equal to 1 / p times the frequency domain density of type 1 DMRS, where p is the adjustment amount and p is an integer greater than 1; or, when the DMRS is type 2 DMRS, the frequency domain density of the DMRS is equal to 1 / p times the frequency domain density of type 2 DMRS, where p is the adjustment amount and p is an integer greater than 1. This implementation uses the first indication information to indicate the adjustment amount p, thereby reducing the frequency domain density of the DMRS and avoiding waste of DMRS resources.

[0038] Based on the fifth or sixth aspect, in one possible implementation, the first indication information is carried in the DMRS configuration information or in the DCI. This reuses existing signaling without redefining new information, improving the practicality of the solution.

[0039] Based on the fifth aspect, in one possible implementation, the method further includes: the terminal device sending capability information to the network device, the capability information indicating at least one of the following: the frequency domain density of the DMRS that the terminal device supports measuring, or the range to which the frequency domain density of the DMRS that the terminal device supports measuring belongs. In this implementation, the terminal device can send capability information to the network device, thereby facilitating the network device to indicate a suitable frequency domain density of the DMRS for the terminal device based on the capability information.

[0040] Based on the sixth aspect, in one possible implementation, the method further includes: the network device receiving capability information from the terminal device, the capability information including at least one of the following: the frequency domain density of the DMRS that the terminal device supports measuring, or the range to which the frequency domain density of the DMRS that the terminal device supports measuring belongs. This facilitates the network device in indicating a suitable frequency domain density of the DMRS to the terminal device based on the capability information.

[0041] The seventh aspect of this application provides a DMRS receiving method, which can be used on the terminal side, for example, executed by a terminal device. The terminal device can be a device or apparatus with a chip, or a device or apparatus with integrated circuitry, or a chip, chip system, module, or control unit in the aforementioned device or apparatus; specifically, this application does not limit the scope. It should be noted that, in this application, when referring to a terminal device, it can refer to the terminal device itself, or to the chip, functional module, or integrated circuit in the terminal device that performs the method provided in this application; specifically, this application does not limit the scope. In the seventh aspect and its possible implementations, the method is described using the example of execution by a terminal device. The method includes: a terminal device receiving second indication information from a network device, the second indication information indicating the type of DMRS; the terminal device determining the frequency domain density of the DMRS according to the type of DMRS; the terminal device receiving the DMRS from the network device according to the frequency domain density of the DMRS, wherein the pattern corresponding to the frequency domain density of the DMRS includes: the DMRS occupying one or more time domain symbols, the number of REs occupied by the DMRS on each time domain symbol being less than the number of REs occupied on each time domain symbol in the pattern corresponding to the frequency domain density of type 1 DMRS, or the number of REs occupied by the DMRS on each time domain symbol being less than the number of REs occupied on each time domain symbol in the pattern corresponding to the frequency domain density of type 2 DMRS.

[0042] Therefore, it can be seen that the terminal device receives second indication information from the network device, which indicates the type of DMRS; the terminal device determines the frequency domain density of the DMRS based on the DMRS type; the terminal device receives the DMRS from the network device based on the DMRS frequency domain density. The pattern corresponding to the DMRS frequency domain density includes: the DMRS occupies one or more time domain symbols, the number of REs occupied by the DMRS on each time domain symbol is less than the number of REs occupied on each time domain symbol in the pattern corresponding to the frequency domain density of type 1 DMRS, or the number of REs occupied by the DMRS on each time domain symbol is less than the number of REs occupied on each time domain symbol in the pattern corresponding to the frequency domain density of type 2 DMRS. Thus, it can be seen that the frequency domain density of the DMRS is reduced. The DMRS type is a new DMRS type, whose frequency domain density is less than that of type 1 DMRS, or less than that of type 2 DMRS. This reduces the frequency domain density of the DMRS in situations with weak channel frequency selectivity, avoiding waste of DMRS resources and thus improving the utilization rate of DMRS resources.

[0043] This application provides an eighth aspect of a DMRS transmission method, which can be used on the network side, for example, executed by a network device. The network device can be a device or apparatus with a chip, or a device or apparatus with integrated circuitry, or a chip, chip system, module, or control unit within the aforementioned device or apparatus; specific details are not limited in this application. It should be noted that, in this application, the term "network device" can refer to the network device itself, or to the chip, functional module, or integrated circuit within the network device that performs the method provided in this application; specific details are not limited in this application. In the eighth aspect and its possible implementations, the method is described using the example of execution by a network device. The method includes: a network device sending second indication information to a terminal device, the second indication information indicating the type of DMRS; the network device determining the frequency domain density of the DMRS according to the type of DMRS; the network device sending the DMRS to the terminal device according to the frequency domain density of the DMRS, wherein the pattern corresponding to the frequency domain density of the DMRS includes: the DMRS occupying one or more time domain symbols, the number of REs occupied by the DMRS on each time domain symbol being less than the number of REs occupied on each time domain symbol in the pattern corresponding to the frequency domain density of type 1 DMRS, or the number of REs occupied by the DMRS on each time domain symbol being less than the number of REs occupied on each time domain symbol in the pattern corresponding to the frequency domain density of type 2 DMRS.

[0044] Therefore, it can be seen that the network device sends a second indication information to the terminal device, which indicates the type of DMRS; the network device determines the frequency domain density of the DMRS based on the DMRS type; the network device sends the DMRS to the terminal device based on the frequency domain density of the DMRS. The pattern corresponding to the frequency domain density of the DMRS includes: the DMRS occupies one or more time domain symbols, the number of REs occupied by the DMRS in each time domain symbol is less than the number of REs occupied in each time domain symbol in the pattern corresponding to the frequency domain density of type 1 DMRS, or the number of REs occupied by the DMRS in each time domain symbol is less than the number of REs occupied in each time domain symbol in the pattern corresponding to the frequency domain density of type 2 DMRS. Thus, it can be seen that the frequency domain density of the DMRS is reduced. The DMRS type is a new DMRS type, whose frequency domain density is less than that of type 1 DMRS, or less than that of type 2 DMRS. This reduces the frequency domain density of the DMRS in situations with weak channel frequency selectivity, avoiding waste of DMRS resources, thereby improving the utilization rate of DMRS resources.

[0045] Based on the seventh or eighth aspect, in one possible implementation, the REs occupied by the DMRS in each time-domain symbol overlap with those occupied by Type 1 DMRS in each time-domain symbol; or, the REs occupied by the DMRS in each time-domain symbol overlap with those occupied by Type 2 DMRS in each time-domain symbol. Therefore, the REs occupied by the DMRS are either the same as or belong to the REs occupied by Type 1 DMRS, or the same as or belong to the REs occupied by Type 2 DMRS. This reduces the frequency domain density of the DMRS and avoids wasting DMRS resources.

[0046] Based on the seventh or eighth aspect, in one possible implementation, the REs occupied by DMRS in each time domain symbol are spaced at least two REs apart between two adjacent REs.

[0047] Based on the seventh or eighth aspect, in one possible implementation, the type of DMRS includes: the frequency domain density of the DMRS is equal to p times the frequency domain density of type 1 DMRS or p times the frequency domain density of type 2 DMRS, where p is greater than 0 and less than 1. Thus, the second indication information indicates the DMRS with a smaller frequency domain density, thereby reducing the frequency domain density of the DMRS and avoiding waste of DMRS resources.

[0048] Based on the seventh or eighth aspect, in one possible implementation, the type of DMRS includes: the frequency domain density of the DMRS is equal to 1 / p times the frequency domain density of type 1 DMRS, where p is an integer greater than 1; or, the type of DMRS includes: the frequency domain density of the DMRS is equal to 1 / p times the frequency domain density of type 2 DMRS, where p is an integer greater than 1. Thus, the second indication information indicates the DMRS with a smaller frequency domain density, thereby reducing the frequency domain density of the DMRS and avoiding waste of DMRS resources.

[0049] Based on the seventh or eighth aspect, in one possible implementation, the second indication information is carried within the DMRS configuration information or within the DCI. This reuses existing signaling without redefining new information, improving the practicality of the solution.

[0050] Based on the seventh aspect, in one possible implementation, the method further includes: the terminal device sending capability information to the network device, the capability information indicating at least one of the following: the frequency domain density of the DMRS that the terminal device supports measuring, the range to which the frequency domain density of the DMRS that the terminal device supports measuring belongs, or the type of DMRS that the terminal device supports measuring. In this implementation, the terminal device can send capability information to the network device, thereby facilitating the network device to indicate a suitable frequency domain density of the DMRS for the terminal device based on the capability information.

[0051] Based on the eighth aspect, in one possible implementation, the method further includes: the network device receiving capability information from the terminal device, the capability information including at least one of the following: the frequency domain density of the DMRS that the terminal device supports measuring, the range to which the frequency domain density of the DMRS that the terminal device supports measuring belongs, or the type of DMRS that the terminal device supports measuring. This facilitates the network device in indicating a suitable frequency domain density of DMRS to the terminal device based on the capability information.

[0052] A ninth aspect of this application provides a first communication device, the first communication device comprising:

[0053] The transceiver module is used to receive first indication information from the second communication device, the first indication information indicating the adjustment amount for adjusting the frequency domain density of the DMRS;

[0054] The processing module is used to determine the frequency domain resources occupied by the DMRS based on the type of the DMRS and the first indication information, wherein the type of the DMRS is type 1 or type 2;

[0055] The transceiver module is also used to receive DMRS from the second communication device via the frequency domain resources occupied by the DMRS.

[0056] A tenth aspect of this application provides a second communication device, the second communication device comprising:

[0057] The transceiver module is used to send first indication information to the first communication device, the first indication information indicating the adjustment amount for adjusting the frequency domain density of the DMRS;

[0058] The processing module is used to determine the frequency domain resources occupied by the DMRS based on the type of the DMRS and the first indication information, wherein the type of the DMRS is type 1 or type 2;

[0059] The transceiver module is also used to send DMRS to the first communication device through the frequency domain resources occupied by DMRS.

[0060] Based on the ninth or tenth aspect, in one possible implementation, the adjustment amount is used to decrease or increase the frequency domain density of the DMRS.

[0061] Based on the ninth or tenth aspect, in one possible implementation, the first indication information specifically indicates the sparsity of the frequency domain density of the DMRS.

[0062] Based on the ninth or tenth aspect, in one possible implementation, the frequency domain resources occupied by the DMRS include the resource elements (REs) occupied by the DMRS. When the type of the DMRS is type 1, the index of the REs occupied by the DMRS is... Alternatively, DMRS uses the RE index. n′ is the index of the symbol in the sequence used to generate DMRS, and the value of n′ ranges from 1 to 2. Y equals the length of the sequence, k′ equals 0 and 1, Δ equals 0 or 1, p is the adjustment amount, p is greater than 0 and less than or equal to 1.

[0063] Based on the ninth or tenth aspect, in one possible implementation, the frequency domain resources occupied by the DMRS include the REs occupied by the DMRS. When the type of the DMRS is type 2, the index of the REs occupied by the DMRS is... Alternatively, DMRS uses the RE index. n′ is the index of the symbol in the sequence used to generate DMRS, and the value of n′ ranges from 1 to 2. Y equals the length of the sequence minus one, k′ equals 0 and 1, Δ equals 0, 2 or 4, p is the adjustment amount, p is greater than 0 and less than or equal to 1.

[0064] Based on the ninth or tenth aspect, in one possible implementation, the frequency domain resources occupied by the DMRS include the REs occupied by the DMRS. When the DMRS type is type 1, the index k of the REs occupied by the DMRS is k = p(4n′) + 2k′ + Δ, or the index k of the REs occupied by the DMRS is k = p(4n′ + 2k′) + Δ, where n′ is the sequence number of the symbol used to generate the DMRS, and the value range of n′ is... Y equals the length of the sequence minus one, k′ equals 0 and 1, Δ equals 0 or 1, p is the adjustment amount, and p is an integer greater than or equal to 1.

[0065] Based on the ninth or tenth aspect, in one possible implementation, the frequency domain resources occupied by the DMRS include the REs occupied by the DMRS. When the DMRS type is type 2, the index k of the REs occupied by the DMRS is k = p(6n′) + k′ + Δ, or the index k of the REs occupied by the DMRS is k = p(6n′ + k′) + Δ, where n′ is the sequence number of the symbol used to generate the DMRS, and the value range of n′ is... Y equals the length of the sequence, k′ equals 0 and 1, Δ equals 0, 2 or 4, p is the adjustment amount, and p is an integer greater than or equal to 1.

[0066] Based on the ninth or tenth aspect, in one possible implementation, the first indication information is carried in the configuration information of the DMRS or in the DCI.

[0067] Based on the ninth aspect, in one possible implementation, the transceiver module is further configured to: send capability information to the second communication device, the capability information being used to indicate at least one of the following: the frequency domain density of the DMRS that the first communication device supports measuring, or the range to which the frequency domain density of the DMRS that the first communication device supports measuring belongs.

[0068] Based on the tenth aspect, in one possible implementation, the transceiver module is further configured to: receive capability information from the first communication device, the capability information including at least one of the following: the frequency domain density of the DMRS that the first communication device supports measuring, or the range to which the frequency domain density of the DMRS that the first communication device supports measuring belongs.

[0069] The eleventh aspect of this application provides a first communication device, the first communication device comprising:

[0070] The transceiver module is used to receive second indication information from the second communication device. The second indication information is used to indicate the type of DMRS. The frequency domain density of the DMRS is different from that of type 1 DMRS and different from that of type 2 DMRS.

[0071] The processing module is used to determine the frequency domain resources occupied by the DMRS based on the type of DMRS;

[0072] The transceiver module is also used to receive DMRS from the second communication device via the frequency domain resources occupied by the DMRS.

[0073] A twelfth aspect of this application provides a second communication device, the second communication device comprising:

[0074] The transceiver module is used to send second indication information to the first communication device. The second indication information is used to indicate the type of DMRS. The frequency domain density of the DMRS is different from that of type 1 DMRS and different from that of type 2 DMRS.

[0075] The processing module is used to determine the frequency domain resources occupied by the DMRS based on the type of DMRS;

[0076] The transceiver module is also used to send DMRS to the first communication device through the frequency domain resources occupied by DMRS.

[0077] Based on the eleventh or twelfth aspect, in one possible implementation, the frequency domain resources occupied by the DMRS include the REs occupied by the DMRS; when the frequency domain density of the DMRS is p times the frequency domain density of type 1 DMRS, where p is greater than 0 and less than or equal to 1, the index of the REs occupied by the DMRS... Alternatively, DMRS uses the RE index. n′ is the index of the symbol in the sequence used to generate DMRS, and the value of n′ ranges from 1 to 2. Y equals the length of the sequence minus one, k′ equals 0 and 1, and Δ equals 0 or 1.

[0078] Based on the eleventh or twelfth aspect, in one possible implementation, the frequency domain resources occupied by the DMRS include the REs occupied by the DMRS; when the frequency domain density corresponding to the type of DMRS is p times the frequency domain density of type 2 DMRS, where p is greater than 0 and less than or equal to 1, the index of the REs occupied by the DMRS is... Alternatively, DMRS uses the RE index. n′ is the index of the symbol in the sequence used to generate DMRS, and the value of n′ ranges from 1 to 2. Y equals the length of the sequence minus one, k′ equals 0 and 1, and Δ equals 0, 2, or 4.

[0079] Based on the eleventh or twelfth aspect, in one possible implementation, the frequency domain resources occupied by the DMRS include the REs occupied by the DMRS; when the frequency domain density corresponding to the type of the DMRS is 1 / p times the frequency domain density of type 1 DMRS, where p is an integer greater than or equal to 1, the index k of the REs occupied by the DMRS is k = p(4n′) + 2k′ + Δ, or, the index k of the REs occupied by the DMRS is k = p(4n′ + 2k′) + Δ, where n′ is the sequence number of the symbol used to generate the DMRS, and the value range of n′ is... Y equals the length of the sequence minus one, k′ equals 0 and 1, and Δ equals 0 or 1.

[0080] Based on the eleventh or twelfth aspect, in one possible implementation, the frequency domain resources occupied by the DMRS include the REs occupied by the DMRS; when the frequency domain density corresponding to the type of the DMRS is 1 / p times the frequency domain density of type 2 DMRS, where p is an integer greater than or equal to 1, the index k of the REs occupied by the DMRS is p(6n′) + k′ + Δ, or, the index k of the REs occupied by the DMRS is p(6n′ + k′) + Δ, where n′ is the sequence number of the symbol used to generate the DMRS, and the value range of n′ is... Y equals the length of the sequence minus one, k′ equals 0 and 1, and Δ equals 0, 2, or 4.

[0081] Based on the eleventh or twelfth aspect, in one possible implementation, the second instruction information is carried in the configuration information of the DMRS or in the DCI.

[0082] Based on the eleventh aspect, in one possible implementation, the transceiver module is further configured to: send capability information to the second communication device, the capability information being used to indicate at least one of the following: the frequency domain density of the DMRS supported by the first communication device for measurement, the range to which the frequency domain density of the DMRS supported by the first communication device for measurement belongs, or the type of DMRS supported by the first communication device for measurement.

[0083] Based on the twelfth aspect, in one possible implementation, the transceiver module is further configured to: receive capability information from the first communication device, the capability information including at least one of the following: the frequency domain density of the DMRS that the first communication device supports measuring, the range to which the frequency domain density of the DMRS that the first communication device supports measuring belongs, or the type of DMRS that the first communication device supports measuring.

[0084] The thirteenth aspect of this application provides a first communication device, the first communication device comprising:

[0085] The transceiver module is used to receive first indication information from the second communication device, the first indication information indicating the adjustment amount for adjusting the frequency domain density of the DMRS;

[0086] The processing module is used to determine the frequency domain density of the DMRS based on the type of the DMRS and the first indication information, wherein the DMRS is either type 1 DMRS or type 2 DMRS;

[0087] The transceiver module is also used to receive DMRS from the second communication device according to the frequency domain density of the DMRS. The pattern corresponding to the frequency domain density of the DMRS includes: the DMRS occupies one or more time domain symbols; when the DMRS is type 1 DMRS, the number of resource elements (REs) occupied by the DMRS on each time domain symbol is less than the number of REs occupied on each time domain symbol in the pattern corresponding to the frequency domain density of type 1 DMRS; when the DMRS is type 2 DMRS, the number of REs occupied by the DMRS on each time domain symbol is less than the number of REs occupied on each time domain symbol in the pattern corresponding to the frequency domain density of type 2 DMRS.

[0088] The fourteenth aspect of this application provides a second communication device, the second communication device comprising:

[0089] The transceiver module is used to send first indication information to the first communication device, the first indication information indicating the adjustment amount for adjusting the frequency domain density of the DMRS;

[0090] The processing module is used to determine the frequency domain density of the DMRS based on the type of the DMRS and the first indication information, wherein the DMRS is either type 1 DMRS or type 2 DMRS;

[0091] The transceiver module is also used to transmit the DMRS to the first communication device according to the frequency domain density of the DMRS. The pattern corresponding to the frequency domain density of the DMRS includes: the DMRS occupies one or more time domain symbols. When the DMRS is type 1 DMRS, the number of REs occupied by the DMRS on each time domain symbol is less than the number of REs occupied on each time domain symbol in the pattern corresponding to the frequency domain density of type 1 DMRS; when the DMRS is type 2 DMRS, the number of REs occupied by the DMRS on each time domain symbol is less than the number of REs occupied on each time domain symbol in the pattern corresponding to the frequency domain density of type 2 DMRS.

[0092] Based on aspect thirteen or fourteen, in one possible implementation, when the DMRS is type 1 DMRS, the REs occupied by the DMRS in each time domain symbol overlap with the REs occupied by type 1 DMRS in each time domain symbol; or, when the DMRS is type 2 DMRS, the REs occupied by the DMRS in each time domain symbol overlap with the REs occupied by type 2 DMRS in each time domain symbol.

[0093] Based on aspect thirteen or fourteen, in one possible implementation, the REs occupied by DMRS in each time domain symbol are spaced at least two REs apart between two adjacent REs.

[0094] Based on aspect thirteen or fourteen, in one possible implementation, when the DMRS is of type 1, the frequency domain density of the DMRS is equal to p times that of type 1 DMRS, where p is the adjustment amount, p is greater than 0 and less than 1; or, when the DMRS is of type 2 DMRS, the frequency domain density of the DMRS is equal to p times that of type 2 DMRS, where p is the adjustment amount, p is greater than 0 and less than 1.

[0095] Based on aspect thirteen or fourteen, in one possible implementation, when the DMRS is of type 1, the frequency domain density of the DMRS is equal to 1 / p times the frequency domain density of type 1 DMRS, where p is the adjustment amount and p is an integer greater than 1; or, when the DMRS is of type 2 DMRS, the frequency domain density of the DMRS is equal to 1 / p times the frequency domain density of type 2 DMRS, where p is the adjustment amount and p is an integer greater than 1.

[0096] Based on aspect thirteen or fourteen, in one possible implementation, the first instruction information is carried in the configuration information of the DMRS or in the DCI.

[0097] Based on the thirteenth aspect, in one possible implementation, the transceiver module is further configured to: send capability information to the second communication device, the capability information being used to indicate at least one of the following: the frequency domain density of the DMRS that the first communication device supports measuring, or the range to which the frequency domain density of the DMRS that the first communication device supports measuring belongs.

[0098] Based on the fourteenth aspect, in one possible implementation, the transceiver module is further configured to: receive capability information from the first communication device, the capability information including at least one of the following: the frequency domain density of the DMRS that the first communication device supports measuring, or the range to which the frequency domain density of the DMRS that the first communication device supports measuring belongs.

[0099] The fifteenth aspect of this application provides a first communication device, the first communication device comprising:

[0100] The transceiver module is used to receive second indication information from the second communication device, the second indication information indicating the type of DMRS;

[0101] The processing module is used to determine the frequency domain density of the DMRS based on its type.

[0102] The transceiver module is also configured to receive DMRS from the second communication device according to the frequency domain density of the DMRS. The pattern corresponding to the frequency domain density of the DMRS includes: the DMRS occupies one or more time domain symbols, the number of REs occupied by the DMRS on each time domain symbol is less than the number of REs occupied on each time domain symbol in the pattern corresponding to the frequency domain density of type 1 DMRS, or the number of REs occupied by the DMRS on each time domain symbol is less than the number of REs occupied on each time domain symbol in the pattern corresponding to the frequency domain density of type 2 DMRS.

[0103] A sixteenth aspect of this application provides a second communication device, the second communication device comprising:

[0104] The transceiver module is used to send second indication information to the first communication device, the second indication information indicating the type of DMRS;

[0105] The processing module is used to determine the frequency domain density of the DMRS based on its type.

[0106] The transceiver module is also used to transmit the DMRS to the first communication device according to the frequency domain density of the DMRS. The pattern corresponding to the frequency domain density of the DMRS includes: the DMRS occupies one or more time domain symbols, the number of REs occupied by the DMRS on each time domain symbol is less than the number of REs occupied on each time domain symbol in the pattern corresponding to the frequency domain density of type 1 DMRS, or the number of REs occupied by the DMRS on each time domain symbol is less than the number of REs occupied on each time domain symbol in the pattern corresponding to the frequency domain density of type 2 DMRS.

[0107] Based on aspect fifteen or sixteen, in one possible implementation, the REs occupied by DMRS in each time domain symbol overlap with the REs occupied by type 1 DMRS in each time domain symbol; or, the REs occupied by DMRS in each time domain symbol overlap with the REs occupied by type 2 DMRS in each time domain symbol.

[0108] Based on aspect fifteen or sixteen, in one possible implementation, the REs occupied by DMRS in each time domain symbol are spaced at least two REs apart from each other.

[0109] Based on aspect fifteen or sixteen, in one possible implementation, the type of DMRS includes: the frequency domain density of the DMRS is equal to p times the frequency domain density of type 1 DMRS or p times the frequency domain density of type 2 DMRS, where p is greater than 0 and less than 1.

[0110] Based on aspect fifteen or sixteen, in one possible implementation, the type of DMRS includes: the frequency domain density of the DMRS is equal to 1 / p times the frequency domain density of type 1 DMRS, where p is an integer greater than 1; or, the type of DMRS includes: the frequency domain density of the DMRS is equal to 1 / p times the frequency domain density of type 2 DMRS, where p is an integer greater than 1.

[0111] Based on aspect fifteen or sixteen, in one possible implementation, the second instruction information is carried in the configuration information of the DMRS or in the DCI.

[0112] Based on the fifteenth aspect, in one possible implementation, the transceiver module is further configured to: send capability information to the second communication device, the capability information being used to indicate at least one of the following: the frequency domain density of the DMRS that the first communication device supports measuring, the range to which the frequency domain density of the DMRS that the first communication device supports measuring belongs, or the type of DMRS that the first communication device supports measuring.

[0113] Based on the sixteenth aspect, in one possible implementation, the transceiver module is further configured to: receive capability information from the first communication device, the capability information including at least one of the following: the frequency domain density of the DMRS supported by the first communication device for measurement, the range to which the frequency domain density of the DMRS supported by the first communication device for measurement belongs, or the type of DMRS supported by the first communication device for measurement.

[0114] The seventeenth aspect of this application provides a communication device comprising a processor and a memory. The memory stores computer programs or computer instructions, and the processor is configured to call and execute the computer programs or computer instructions stored in the memory, causing the processor to implement any one of the implementation methods of any one of the first to eighth aspects.

[0115] Optionally, the communication device may also include a transceiver, and the processor is used to control the transceiver to send and receive signals.

[0116] The eighteenth aspect of this application provides a communication apparatus, including a processor and an interface circuit, wherein the processor is configured to communicate with other devices via the interface circuit and to perform the method described in any one of the first to eighth aspects. The processor may include one or more devices.

[0117] The nineteenth aspect of this application provides a communication device including a processor for connection to a memory, for calling a program stored in the memory to execute the method described in any one of the first to eighth aspects. The memory may be located within or outside the communication device. The processor may include one or more processors.

[0118] In one implementation, the terminal devices described in the first, third, fifth, and seventh aspects, and the network devices described in the second, fourth, sixth, and eighth aspects, can be chips or chip systems.

[0119] Optionally, the first communication device shown in the ninth, eleventh, thirteenth, and fifteenth aspects may be a terminal device, a communication module in a terminal device, or a chip in a terminal device responsible for communication functions.

[0120] The twentieth aspect of this application provides a computer program product including computer instructions, characterized in that, when run on a computer, it causes the computer to perform any of the implementations of any one of the first to eighth aspects.

[0121] The twenty-first aspect of this application provides a computer-readable storage medium including computer instructions that, when executed on a computer, cause the computer to perform any of the implementations of any one of the first to eighth aspects.

[0122] The twenty-second aspect of this application provides a chip device including a processor for calling a computer program or computer instructions in a memory to cause the processor to execute any one of the implementations of the first to eighth aspects described above.

[0123] Optionally, the processor is coupled to the memory via an interface.

[0124] The 23rd aspect of this application provides a communication system including a terminal device and a network device; the terminal device is used to perform the methods shown in the first, third, fifth, or seventh aspects, and the network device is used to perform the methods shown in the second, fourth, sixth, or eighth aspects.

[0125] As described in the above technical solution, the terminal device receives first indication information from the network device, which indicates the adjustment amount for adjusting the frequency domain density of the DMRS. Then, the terminal device determines the frequency domain resources occupied by the DMRS based on the type of the DMRS and the first indication information; the DMRS type is either type 1 or type 2. The terminal device receives the DMRS from the network device through the frequency domain resources occupied by the DMRS. Therefore, the terminal device receives the first indication information from the network device, which indicates the adjustment amount for adjusting the frequency domain density of the DMRS. This enables flexible adjustment of the frequency domain density of the DMRS. The terminal device determines the frequency domain resources occupied by the DMRS based on the type of the DMRS and the first indication information, and then receives the DMRS from the network device through these resources. This allows for adjustment (e.g., reduction) of the DMRS frequency domain density through the first indication information when channel frequency selection is weak, avoiding waste of DMRS resources and improving the utilization rate of DMRS resources. Attached Figure Description

[0126] Figure 1 is a schematic diagram of an open radio access network (open RAN, O-RAN, or ORAN) system according to an embodiment of this application;

[0127] Figure 2 is a structural schematic diagram of an access network device according to an embodiment of this application;

[0128] Figure 3 is a schematic diagram of a communication system according to an embodiment of this application;

[0129] Figure 4 is another schematic diagram of the communication system according to an embodiment of this application;

[0130] Figure 5 is a schematic diagram of a DMRS of type 1 in this application;

[0131] Figure 6 is a schematic diagram of the 2DMRS type of the present application embodiment;

[0132] Figure 7 is a schematic diagram of an embodiment of the DMRS transmission method and DMRS reception method of this application;

[0133] Figure 8A is a schematic diagram of a DMRS embodiment of this application;

[0134] Figure 8B is another schematic diagram of the DMRS embodiment of this application;

[0135] Figure 8C is another schematic diagram of the DMRS embodiment of this application;

[0136] Figure 9A is another schematic diagram of the DMRS embodiment of this application;

[0137] Figure 9B is another schematic diagram of the DMRS embodiment of this application;

[0138] Figure 10 is a schematic diagram of another embodiment of the DMRS transmission method and DMRS reception method of this application;

[0139] Figure 11 is a schematic diagram of another embodiment of the DMRS transmission method and DMRS reception method of this application;

[0140] Figure 12 is a schematic diagram of another embodiment of the DMRS transmission method and DMRS reception method of this application;

[0141] Figure 13 is a structural schematic diagram of a communication device according to an embodiment of this application;

[0142] Figure 14 is another structural schematic diagram of the communication device according to an embodiment of this application;

[0143] Figure 15 is another structural schematic diagram of the communication device according to an embodiment of this application;

[0144] Figure 16 is a structural schematic diagram of a terminal device according to an embodiment of this application;

[0145] Figure 17 is a schematic diagram of a network device according to an embodiment of this application. Detailed Implementation

[0146] This application provides a DMRS receiving method, a DMRS transmitting method, and an apparatus for flexibly adjusting the frequency domain density of the DMRS. This allows for adjusting (e.g., reducing) the frequency domain density of the DMRS when channel frequency selectivity is weak, avoiding waste of DMRS resources and thus improving the utilization rate of DMRS resources.

[0147] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0148] References to "one embodiment" or "some embodiments" as described in this application mean that one or more embodiments of this application include a specific feature, structure, or characteristic described in connection with that embodiment. Therefore, the phrases "in one embodiment," "in some embodiments," "in other embodiments," "in still other embodiments," etc., appearing in different parts of this specification do not necessarily refer to the same embodiment, but rather mean "one or more, but not all, embodiments," unless otherwise specifically emphasized. The terms "comprising," "including," "having," and variations thereof mean "including but not limited to," unless otherwise specifically emphasized.

[0149] In the description of this application, unless otherwise stated, " / " means "or". For example, A / B can mean A or B. "And / or" in this document is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A alone, A and B simultaneously, and B alone. Furthermore, "at least one" means one or more, and "multiple" means two or more. "At least one of the following" or similar expressions refer to any combination of these items, including any combination of single or multiple items. For example, at least one of a, b, or c can represent: a, b, c; a and b; a and c; b and c; or a and b and c. Where a, b, and c can be single or multiple.

[0150] It is understood that in this application, "instruction" can include direct instruction, indirect instruction, explicit instruction, and implicit instruction. When describing a certain instruction information to indicate A, it can be understood that the instruction information carries A, directly indicates A, or indirectly indicates A.

[0151] The technical solutions of this application can be applied to various communication systems. For example, 5th generation (5G) systems, new radio (NR) systems, long term evolution (LTE) systems, LTE frequency division duplex (FDD) systems, LTE time division duplex (TDD) systems, universal mobile telecommunication system (UMTS), future communication networks, vehicle-to-everything (V2X) communication systems, device-to-device (D2D) communication systems, Internet of Things (IoT) communication systems, industrial internet communication systems, or satellite communication systems, etc. The wireless communication systems involved in this application also include, but are not limited to, narrowband Internet of Things (NB-IoT) systems.

[0152] The communication systems to which this application applies include terminal equipment and network equipment. The terminal equipment and network equipment involved in this application are described below.

[0153] Terminal equipment, also known as user equipment (UE), mobile station (MS), mobile terminal (MT), fixed wireless access (FWA), customer premises equipment (CPE), etc., refers to devices that include wireless communication capabilities (providing voice / data connectivity to users). Examples include handheld devices with wireless connectivity, in-vehicle devices, and machine-type communication (MTC) terminals. Currently, terminal devices can include: mobile phones, tablets, laptops, PDAs, mobile internet devices (MIDs), wearable devices, virtual reality (VR) devices, augmented reality (AR) devices, wireless terminals in industrial control, wireless terminals in self-driving (e.g., drones, vehicles), wireless terminals in remote medical surgery, wireless terminals in smart grids, wireless terminals in transportation safety, wireless terminals in smart cities, and wireless terminals in smart homes. For example, wireless terminals in self-driving can be drones, helicopters, or airplanes. For example, wireless terminals in vehicle-to-everything (V2X) can be in-vehicle equipment, vehicle-mounted equipment, in-vehicle modules, vehicles, or ships. Wireless terminals in industrial control can be cameras, robots, or robotic arms. Wireless terminals in smart homes can be televisions, air conditioners, robot vacuums, speakers, or set-top boxes. The terminal device can also be a device or module that is connected to the communication system shown above and has corresponding communication functions. The terminal device usually contains a communication module, circuit or chip that performs the corresponding communication function, and the terminal device is also configured with program instructions for performing the corresponding communication function.

[0154] It should be noted that the terminal device can be a device or apparatus with a chip, or a device or apparatus with integrated circuitry, or a chip, chip system, module, or control unit in the device or apparatus shown above; the specific application is not limited to any particular type. It should also be noted that in this application, when referring to a terminal device, it can refer to the terminal device itself, or to the chip, functional module, or integrated circuit within the terminal device that performs the method provided in this application; the specific application is not limited to any particular type.

[0155] A network device is a device deployed in a radio access network to provide wireless communication functions for terminal devices. Network devices may also be referred to as radio access network (RAN) entities, access nodes, network nodes, access network equipment, or communication devices, etc.

[0156] Specifically, the network equipment can be access network equipment for cellular systems related to the 3rd Generation Partnership Project (3GPP). For example, fourth-generation (4G) mobile communication systems, 5G mobile communication systems, or future communication network systems. The network equipment can also be access network equipment in open RAN (O-RAN or ORAN) or cloud radio access network (CRAN). Alternatively, the network equipment can also be access network equipment in a communication system resulting from the integration of two or more of the above communication systems.

[0157] Network equipment includes, but is not limited to: evolved Node B (eNB), radio network controller (RNC), Node B (NB), base station controller (BSC), base transceiver station (BTS), home base station (e.g., home evolved NodeB, or home Node B, HNB), baseband unit (BBU), access point (AP) in wireless fidelity (WIFI) systems, macro base station, micro base station, wireless relay node, donor node, radio controller in CRAN scenarios, wireless backhaul node, transmission point (TP), or transmit / receive point (or transmission and reception point, TRP). Network equipment can also be access network equipment in 5G mobile communication systems. For example, next-generation Node B (gNB), TRP, TP in new radio (NR) systems, or one or more antenna panels (including multiple antenna panels) of a base station in a 5G mobile communication system. Alternatively, network devices can also be network nodes constituting a gNB or transmission point. Examples include centralized units (CUs), distributed units (DUs), CU-control plane (CPs), CU-user plane (UPs), or radio units (RUs). CUs and DUs can be separate entities or included in the same network element, such as a BBU. RUs can be included in radio equipment or radio units, such as remote radio units (RRUs), active antenna units (AAUs), or remote radio heads (RRHs). Alternatively, network devices can also be servers, wearable devices, vehicles, or in-vehicle equipment. For example, in V2X technology, network devices can be roadside units (RSUs).

[0158] It should be noted that CU (or CU-CP and CU-UP), DU, or RU may have different names in different systems, but those skilled in the art will understand their meaning. For example, in an ORAN system, CU can also be called an open centralized unit (O-CU) or an open CU, DU can also be called an open distributed unit (O-DU), centralized unit control plane (CU-CP) can also be called an open centralized unit control plane (O-CU-CP) or an open CU-CP, centralized unit user plane (CU-UP) can also be called an open centralized unit user plane (O-CU-UP) or an open CU-UP, and RU can also be called an open radio unit (O-RU). This application does not impose any specific limitations. Any of the units CU, CU-CP, CU-UP, DU, and RU in this application can be implemented through software modules, hardware modules, or a combination of software and hardware modules.

[0159] Figure 1 is a schematic diagram of an ORAN system according to an embodiment of this application. The ORAN system includes a core network, access network equipment, and UE. Optionally, the ORAN system may also include other components besides those shown in Figure 1, which is not limited in this application.

[0160] Access network devices can communicate with the core network (CN) via a backhaul link. Access network devices can also communicate with the UE via an air interface. Specifically, the BBU in the access network device communicates with the core network via a backhaul link. The RU in the access network device communicates with at least one UE via an air interface. The BBU communicates with at least one RU via a fronthaul link; the BBU and RU may or may not be co-located.

[0161] A BBU consists of at least one CU and at least one DU, and the CU and DU can communicate with each other via at least one midhaul link.

[0162] In one possible implementation, as shown in Figure 2, the CU is a logical node carrying the radio resource control (RRC), service data adaptation protocol (SDAP) layer, packet data convergence protocol (PDCP) layer, and other control functions of the access network equipment. The CU can connect to network nodes such as the core network through interfaces, such as the E2 interface. Optionally, the CU can have some core network functions. The CU (e.g., the PDCP layer and / or higher) connects to the DU (e.g., the radio link control (RLC) layer and lower layers of the DU) through interfaces, such as the F1 interface. Optionally, the F1 interface can provide control plane (C-Plane) and user plane (U-Plane) functions (e.g., interface management, system information management, UE context management, RRC message transmission, etc.). F1AP is the application protocol of the F1 interface, defining the signaling procedures of F1 in some examples. The F1 interface supports control plane F1-C and user plane F1-U.

[0163] Optionally, as shown in Figure 2, the CU can be split into CU-CP and CU-UP. CU-CP is a logical node carrying the control plane (PDCP-C) layer, which carries the RRC layer and the Packet Data Convergence Protocol layer, and is used to implement the CU's control plane functions. CU-CP can interact with network elements in the core network used to implement control plane functions. These network elements in the core network can be access and mobility function (AMF) network elements, such as the access and mobility management function (AMF) in a 5G mobile communication system. The AMF network element is responsible for mobility management in the mobile network, such as terminal device location updates, terminal device registration with the network, and terminal device handover. CU-UP is a logical node carrying the user plane (PDCP-U) layer, which carries the SDAP layer and the Packet Data Convergence Protocol layer, and is used to implement the CU's user plane functions. CU-UP can interact with network elements in the core network used to implement user plane functions. In the core network, network elements used to implement user plane functions, such as the user plane function (UPF) in a 5G mobile communication system, are responsible for forwarding and receiving data in terminal devices. The configuration of CU and DU described above is merely an example; in practical applications, the functions of CU and DU can be configured as needed. For example, CU or DU can be configured to have more protocol layer functions, or to have only some protocol layer processing functions. For instance, some RLC layer functions and protocol layer functions above the RLC layer can be placed in the CU, while the remaining RLC layer functions and protocol layer functions below the RLC layer can be placed in the DU. Furthermore, the functions of CU or DU can be divided according to service type or other system requirements, such as by latency, placing functions that need to meet low latency requirements in the DU and functions that do not need to meet such latency requirements in the CU.

[0164] In one possible implementation, as shown in Figure 2, the DU is a logical node carrying the RLC layer, medium access control (MAC) layer, higher physical layer (Higher PHY layer), and other functions. In some examples, the DU can control at least one RU. The DU connects to the RU through interfaces, which can be fronthaul interfaces. In some examples, the Higher PHY layer includes PHY layer processing functions such as forward error correction (FEC) encoding and decoding, scrambling, modulation, and demodulation.

[0165] In one possible implementation, as shown in Figure 2, the RU is a logical node carrying both lower physical layer (PHY) and radio frequency (RF) processing. In some examples, the RU can be a 3GPP transmission reception point (TRP), a remote radio head (RRH), or other similar entities. In some examples, the Low-PHY includes PHY processing functions such as Fast Fourier Transform (FFT), Inverse Fast Fourier Transform (IFFT), digital beamforming, and filtering. The RU communicates with one or more UEs via a wireless link.

[0166] The DU and RU can be co-located or not. The DU and RU exchange control plane and user plane information via a fronthaul link through the Lower-Layer Split CUS-Plane (LLS-CUS) interface. LLS-CUS may include a Lower-Layer Split control (LLS-C) interface and a Lower-Layer Split user (LLS-U) interface, providing the control plane (C-Plane) and user plane (U-Plane) respectively. In some examples, the control plane (C-Plane) refers to real-time control between the DU and RU. The DU and RU exchange management information via a Lower-Layer Split management (LLS-M) interface on the fronthaul link; the management plane (M-Plane) refers to non-real-time management operations between the DU and RU.

[0167] DU and RU can cooperate to implement the functions of the PHY layer. A DU can be connected to one or more RUs. The functions of DU and RU can be configured in various ways depending on the design. For example, a DU can be configured to implement baseband functions, and an RU can be configured to implement mid-RF functions. Another example is that a DU can be configured to implement higher-level functions in the PHY layer, and an RU can be configured to implement lower-level functions in the PHY layer, or to implement both lower-level and RF functions. Higher-level functions in the physical layer can include a portion of the physical layer's functions that are closer to the MAC layer, while lower-level functions in the physical layer can include another portion of the physical layer's functions that are closer to the mid-RF side.

[0168] In different systems, CU (or CU-CP and CU-UP), DU, or RU may have different names, but those skilled in the art will understand their meaning. For example, in an ORAN system, CU can also be called O-CU (open CU), DU can also be called O-DU, CU-CP can also be called O-CU-CP, CU-UP can also be called O-CU-UP, and RU can also be called O-RU. For ease of description, this application uses CU, CU-CP, CU-UP, DU, and RU as examples.

[0169] It should be noted that network devices can be devices or apparatuses with chips, or devices or apparatuses with integrated circuits, or chips, chip systems, modules, or control units in the devices or apparatuses shown above; this application does not impose any specific limitations. It should also be noted that in this application, the term "network device" can refer to the network device itself, or to chips, functional modules, or integrated circuits within the network device that implement the methods provided in this application; this application does not impose any specific limitations.

[0170] To facilitate understanding of the technical solutions of the embodiments of this application, the following, in conjunction with Figures 3 and 4, illustrates two possible communication systems to which the methods provided in the embodiments of this application are applicable.

[0171] Figure 3 is a schematic diagram of a communication system according to an embodiment of this application. As shown in Figure 3, the communication system includes at least one network device and at least one terminal device. For example, network device 311, terminal device 321, and terminal device 322 are shown in Figure 3. Network device 311 can transmit data with terminal device 321 and terminal device 322. Network device 311 and terminal device 321 or terminal device 322 can implement the technical solution of this application.

[0172] Figure 4 is another schematic diagram of the communication system according to an embodiment of this application. As shown in Figure 4, the communication system may include at least two network devices and at least one terminal device. For example, network devices 411, 412, 413, and terminal device 421 are shown in Figure 4. Terminal device 421 may be provided with communication services by multiple network devices. For example, as shown in Figure 4, network device 411 may transmit with terminal device 421, network device 412 may transmit with terminal device 421, and network device 413 may transmit with terminal device 421. That is, a terminal device may be provided with communication services by multiple network devices simultaneously. Terminal device 421 and network devices 411, 412, or 413 can implement the technical solution of this application.

[0173] The following describes some of the technical terms used in this application.

[0174] Antenna Port: An antenna port can be understood as a transmitting antenna that can be identified by a signal receiver, or a receiving antenna that can be identified by a signal transmitter. In this implementation, the antenna port can be called a virtual antenna or a logical antenna. Alternatively, an antenna port can be understood as a spatially distinguishable transmitting or receiving antenna; in this implementation, the antenna port can be called a physical antenna. The relationship between the antenna port and the physical antenna can be one-to-one, one-to-many, or many-to-one.

[0175] Frequency domain density of DMRS: The ratio of the number of REs occupied by DMRS on a resource block (RB) to the total number of REs included in that RB. For example, as shown in Figure 5, the frequency domain density of DMRS1 and DMRS2 is 1 / 2. As another example, as shown in Figure 6, the frequency domain density of DMRS3, DMRS4, and DMRS5 is 1 / 3.

[0176] PDSCH time-domain resources can be configured via higher-level signaling, specifically indicated by the PDSCH-TimeDomainResourceAllocationList field. The format of this PDSCH-TimeDomainResourceAllocationList field is as follows:

[0177] PDSCH-TimeDomainResourceAllocationList::-SEQUENCE{

[0178] K0INTEGER(0…32)

[0179] mappingTypeENUMERRATED{typeA, typeB}

[0180] StartSymbolAndLength INTEGER(0…127)}

[0181] Where K0 is the time slot offset interval, mappingType is the mapping type of the PDSCH time domain resource, i.e., type A or type B. StartSymbolAndLength is the starting symbol and the number of consecutive time domain symbols of the PDSCH resource.

[0182] The following describes the mapping types of PDSCH time-domain resources.

[0183] I. Type A.

[0184] Within a time slot, the starting time domain symbol of a PDSCH resource can be time domain symbol 0, time domain symbol 1, time domain symbol 2, or time domain symbol 3. The length of the time domain symbol occupied by a PDSCH resource ranges from 3 to 14 time domain symbols. The time domain symbols occupied by a PDSCH resource cannot exceed the time slot boundary.

[0185] 2. Type B.

[0186] Within a time slot, the starting time domain symbol of a PDSCH resource can be time domain symbol 0, time domain symbol 2, ..., or time domain symbol 12. The time domain symbol length occupied by a PDSCH resource is 2, 4, or 7 time domain symbols. The time domain symbols occupied by a PDSCH resource cannot exceed the time slot boundary.

[0187] DMRS is used for channel estimation and data demodulation. The receiving device uses DMRS for wireless channel estimation and demodulation of related physical channels. Except for the Physical Random Access Channel (PRACH), other physical channels have corresponding DMRS transmissions. For example, PDSCH is transmitted alongside DMRS. Based on their time-domain location, DMRS can be divided into two types: pre-DMRS and supplementary DMRS.

[0188] First, let's introduce the pre-dmrs (DMRS). To reduce demodulation and decoding delays, the DMRS is located before or within the starting time-domain symbol of the PDSCH. The DMRS occupies one or two time-domain symbols. Since the DMRS is used to demodulate the PDSCH, its time-domain position is determined by the mapping type of the PDSCH time-domain resources. If the mapping type of the PDSCH time-domain resources is Type A, then the starting time-domain symbol of the PDSCH can be time-domain symbol 0, time-domain symbol 1, time-domain symbol 2, or time-domain symbol 3. The starting time-domain position of the DMRS within the time slot is time-domain symbol 2 or time-domain symbol 3, usually defaulting to time-domain symbol 2. If the demodulation reference signal-type A-position (dmrs-TypeA-Position) in the master information block (MIB) is 3, then the starting time-domain position of the DMRS within the time slot is 3. If the mapping type of the PDSCH time domain position is TypeB, then the starting time domain symbol of the PDSCH can be any one of time domain 0 to time domain symbol 12, and the starting time domain symbol of the DMRS is located at the starting time domain symbol of the PDSCH.

[0189] Next, we will introduce the Additional DMRS. The Additional DMRS occupies 1 to 3 time-domain symbols. The network side can indicate the existence of the Additional DMRS and its time-domain location through higher-layer parameters (i.e., the Additional DMRS Position field).

[0190] Based on the number of antenna ports supported, DMRS can be divided into Type 1 and Type 2. The network side can configure the DMRS type through higher-level parameters. The number of antenna ports supported by DMRS refers to the number of antenna ports mapped to by the DMRS.

[0191] Type 1 DMRS supports 4 antenna ports on a single time-domain symbol and 8 antenna ports on dual time-domain symbols. Adjacent REs in a Type 1 DMRS resource element (RE) are separated by one RE. For a resource block (RB), six REs in that RB are occupied by DMRS. The bandwidth occupied by Type 1 DMRS is the same as that occupied by PDSCH. The index calculation formula for the REs occupied by Type 1 DMRS is shown in Equation 1: k = 4n + 2k′ + Δ (Equation 1)

[0192] Where n is the symbol number in the sequence used to generate type 1 DMRS, and the value of n ranges from [0, Y), where Y is the length of the sequence used to generate type 1 DMRS, or the number of symbols included in the sequence used to generate type 1 DMRS. k′ equals 0 and 1. Δ equals 0 or 1. Δ can be configured in the configuration information of type 1 DMRS. Δ can be understood as the offset of the starting RE occupied by type 1 DMRS relative to PDSCH. Figure 5 shows the patterns of DMRS1 and DMRS2. As shown in Figure 5, both DMRS1 and DMRS2 are type 1 DMRS. DMRS1 is mapped to antenna ports 1000, 1001, 1004, and 1005. DMRS1 occupies RE0, RE2, RE4, RE6, RE8, and RE10 on time domain symbols 2 and 3. There is a gap of one RE between two adjacent REs occupied by DMRS1 on each time domain symbol. The frequency domain density of DMRS1 is 1 / 2. DMRS2 is similar to DMRS1, so it will not be described further here.

[0193] Type 2 DMRS supports 6 antenna ports on a single time-domain symbol and 12 antenna ports on dual time-domain symbols. Adjacent REs in a Type 2 DMRS configuration are spaced 4 REs apart. For a single RB, four REs within that RB are occupied by the DMRS. The bandwidth occupied by Type 2 DMRS is the same as that occupied by PDSCH. The index of REs occupied by Type 2 DMRS is calculated using Equation 2: k = 6n + k′ + Δ (Equation 2)

[0194] Where n is the sequence number of the symbol used to generate the type 2 DMRS sequence. The value of n ranges from [0, Y), where Y is the length of the sequence used to generate the type 2 DMRS, or the number of symbols included in the sequence. k′ equals 0 and 1. Δ equals 0, 2, or 4. Δ can be configured in the type 2 DMRS configuration information. Δ can be understood as the offset of the starting RE occupied by the type 2 DMRS relative to the PDSCH. As shown in Figure 6, Figure 6 shows the patterns of DMRS3, DMRS4, and DMRS5. DMRS3, DMRS4, and DMRS5 are all type 2 DMRS. For example, DMRS3 is mapped to antenna ports 1000, 1001, 1006, and 1007. DMRS3 occupies RE0, RE1, RE6, and RE7 on time-domain symbols 2 and 3. The frequency density of DMRS3 is 1 / 3. DMRS4 and DMRS5 are similar to DMRS3, so they will not be described further here.

[0195] The terminal device determines the frequency domain location of the DMRS based on the radio control resource (RRC) parameters and the DCI. As shown below, the RRC parameters indicate the type of DMRS and the maximum number of time-domain symbols occupied.

[0196] DMRS-DownlinkConfig::=SEQUENCE{

[0197] Dmrs-TypeENUMERRATED{type2}

[0198] Dmrs-AddtionalPositionENUMERRATED{pos0, pos1, pos3}

[0199] maxLengthENUMERRATED{len2}

[0200] }

[0201] The terminal device determines whether the DMRS type is Type 1 or Type 2 using the RRC parameters. Then, the terminal device can determine the RE occupied by the PDSCH through the above PDSCH configuration. Finally, the terminal device can determine the RE occupied by the DMRS by combining the DMRS type and the RE occupied by the PDSCH.

[0202] Currently, the frequency domain density of DMRS is relatively uniform. When channel frequency selectivity is weak (i.e., channel changes are slow with frequency domain changes), using a DMRS with a high frequency domain density leads to wasted DMRS resources and affects DMRS resource utilization. This application provides a DMRS transmission method, a DMRS reception method, and an apparatus to flexibly adjust the frequency domain density of DMRS. It enables adjustment (e.g., reduction) of the DMRS frequency domain density when channel frequency selectivity is weak, avoiding wasted DMRS resources and improving DMRS resource utilization. Please refer to the relevant descriptions in the embodiments below for details.

[0203] In this application, p, p, and p can be interchanged with each other. Y, Y, and Y can be interchanged with each other. k, k, and k can be interchanged with each other.

[0204] The technical solution of this application is described below with reference to specific embodiments.

[0205] Figure 7 is a schematic diagram of an embodiment of the DMRS transmission method and DMRS reception method of this application. Referring to Figure 7, the method includes:

[0206] 701. The network device sends a first instruction message to the terminal device. Correspondingly, the terminal device receives the first instruction message from the network device.

[0207] The first indication information indicates the adjustment amount used to adjust the frequency domain density of the DMRS.

[0208] Optionally, the adjustment amount is used to decrease or increase the frequency domain density of the DMRS. For example, in the case of decreasing the frequency domain density of the DMRS, the first indication information indicates the sparsity of the DMRS. This adjustment amount can be understood as the sparsity.

[0209] Optionally, the first indication information may also be called frequency domain density indication or sparsity indication, etc., which is not limited in this application.

[0210] In one possible implementation, the adjustment amount is p. When p = 1 or the value of p is defaulted, it indicates that the frequency domain density of the DMRS remains unchanged. When p is greater than 0 and less than 1, it indicates that the frequency domain density of the DMRS is sparser by a factor of p.

[0211] In another possible implementation, the adjustment amount is p. When p = 1 or the value of p is defaulted, it means that the frequency domain density of the DMRS remains unchanged. When p is an integer greater than or equal to 1, it means that the frequency domain density of the DMRS is sparse by 1 / p.

[0212] Optionally, the first indication information is carried in the DCI, or the first indication information is carried in the configuration information of the DMRS.

[0213] In the case where the first indication information is carried in the DCI, optionally, the embodiment shown in FIG7 further includes step 701a. Step 701a may be performed before step 701.

[0214] 701a. The network device sends DMRS configuration information to the terminal device. Correspondingly, the terminal device receives the DMRS configuration information from the network device.

[0215] Optionally, the DMRS configuration information includes the DMRS type. For example, the DMRS type is either Type 1 or Type 2. In other words, the DMRS is either Type 1 DMRS or Type 2 DMRS. Please refer to the relevant introductions above for information on Type 1 DMRS and Type 2 DMRS; they will not be repeated here.

[0216] Optionally, the embodiment shown in FIG7 further includes step 701b. Step 701b may be performed before step 701.

[0217] 701b. The terminal device sends capability information to the network device. Correspondingly, the network device receives the capability information from the terminal device.

[0218] The capability information includes at least one of the following: the frequency domain density of the DMRS that the terminal device supports measuring, or the range to which the frequency domain density of the DMRS that the terminal device supports measuring belongs. For example, the frequency domain density of the DMRS that the terminal device supports measuring is 1 / 2, 1 / 3, 1 / 4, or 1 / 6, etc.

[0219] It should be noted that if the embodiment shown in Figure 7 further includes step 701a, there is no fixed execution order between steps 701a and 701b. Step 701a can be executed first, followed by step 701b; or step 701b can be executed first, followed by step 701a; or, depending on the situation, steps 701a and 701b can be executed simultaneously. This application does not limit the specific execution order.

[0220] 702. The terminal device determines the frequency domain resources occupied by the DMRS based on the type of DMRS and the first indication information.

[0221] Specifically, the terminal device can determine the type of DMRS based on the DMRS configuration information. The DMRS type is either Type 1 or Type 2. Then, the terminal device determines the frequency domain resources occupied by the DMRS based on the DMRS type and the adjustment amount indicated by the first indication information. Alternatively, the terminal device determines the frequency domain density of the DMRS based on the DMRS type and the first indication information, and then determines the frequency domain resources occupied by the DMRS based on the frequency domain density of the DMRS.

[0222] The following section describes some possible implementations of step 702, taking into account the type of DMRS and the adjustment amount indicated by the first indication information.

[0223] I. The frequency domain resources occupied by the DMRS include the REs occupied by the DMRS. When the DMRS type is type 1, the index of the REs occupied by the DMRS is... Alternatively, DMRS uses the RE index.

[0224] Where n′ is the index of the symbol used to generate the DMRS sequence. The range of values ​​for n′ is... Y equals the length used to generate the DMRS sequence minus one, k′ equals 0 and 1, Δ equals 0 or 1, and p is an adjustment value, p greater than 0 and less than or equal to 1. Optionally, p = 0.5. That is, the frequency domain density of the DMRS is p times the frequency domain density of the Type 1 DMRS.

[0225] For example, as shown in Figure 8A, for the first DMRS, Δ = 0, meaning the offset of the starting RE occupied by the first DMRS relative to the starting RE of the PDSCH is 0, i.e., the starting RE occupied by the first DMRS is located at the starting RE of the PDSCH. p = 0.5, Y = 6, therefore the value range of n′ is [0, 3). The index of the RE occupied by the DMRS... When n′=0, k′=0, k=0; when n′=0, k′=1, k=2; when n′=1, k′=0, k=8; when n′=1, k′=1, k=10. When n′ is equal to 2, the value of k exceeds the index size of the REs included in the RB shown in Figure 8A. Therefore, it can be seen that the REs occupied by the first DMRS include RE0, RE2, RE8, and RE10. As shown in Figure 8A, the first DMRS occupies RE0, RE2, RE8, and RE10 in time domain symbol 2 and time domain symbol 3, respectively. For example, for the second DMRS, Δ=1, that is, the offset of the starting RE occupied by the second DMRS relative to the starting RE of the PDSCH is 1. p=0.5, Y=6, therefore the value range of n′ is [0,3). The index of the REs occupied by the DMRS When n′=0, k′=0, k=1; when n′=0, k′=1, k=3; when n′=2, k′=0, k=9; when n′=1, k′=11. When n′ is equal to 2, the value of k exceeds the index size of the REs included in the RB shown in Figure 8A. Therefore, it can be known that the REs occupied by the second DMRS include RE1, RE3, RE9, and RE11. As shown in Figure 8A, the second DMRS occupies RE1, RE3, RE9, and RE11 in time domain symbol 2 and time domain symbol 3, respectively.

[0226] For example, as shown in Figure 8B, for the first DMRS, Δ = 0, meaning the offset of the starting RE occupied by the first DMRS relative to the starting RE of the PDSCH is 0, i.e., the starting RE occupied by the first DMRS is located at the starting RE of the PDSCH. p = 0.5, Y = 6, therefore the value range of n′ is [0, 3). The index of the RE occupied by the DMRS... When n′=0, k′=0, k=0; when n′=0, k′=1, k=4; when n′=1, k′=0, k=8. When n′=1, k′=1, k=12, at which point k exceeds the index size of the REs included in the RB shown in Figure 8B. When the value of n′ is equal to 2, the value of k exceeds the index size of the REs included in the RB shown in Figure 8B. Therefore, it can be known that the REs occupied by the first DMRS include RE0, RE4, and RE8. As shown in Figure 8B, the first DMRS occupies RE0, RE4, and RE8 in time domain symbol 2 and time domain symbol 3, respectively. For example, as shown in Figure 8B, for the second DMRS, Δ=1, that is, the offset of the starting RE occupied by the second DMRS relative to the starting RE of the PDSCH is 1. p=0.5, Y=6, therefore the value range of n′ is [0,3). The index of the REs occupied by the DMRS When n′=0, k′=0, k=1; when n′=0, k′=1, k=5; when n′=1, k′=0, k=9. When n′=1, k′=1, k=13, at which point k exceeds the index size of the REs included in the RB shown in Figure 8B. When the value of n′ is equal to 2, the value of k exceeds the index size of the REs included in the RB shown in Figure 8B. Therefore, it can be known that the REs occupied by the second DMRS include RE1, RE5, and RE9. As shown in Figure 8B, the second DMRS occupies RE1, RE5, and RE9 in time domain symbol 2 and time domain symbol 3, respectively.

[0227] It should be noted that the formula for the index of REs occupied by the DMRS described above is merely an example. In practical applications, the formula can also be used to calculate the index of REs occupied by the DMRS. For example, as shown in Figure 8C, the terminal device calculates the REs occupied by the first DMRS using other formulas, including RE2, RE6, and RE10. That is, the first DMRS occupies RE2, RE6, and RE10 in time domain symbol 2 and time domain symbol 3, respectively. The terminal device calculates the REs occupied by the second DMRS using other formulas, including RE3, RE7, and RE11. That is, the second DMRS occupies RE3, RE7, and RE11 in time domain symbol 2 and time domain symbol 3, respectively.

[0228] II. The frequency domain resources occupied by the DMRS include the REs occupied by the DMRS. When the DMRS type is type 2, the index of the REs occupied by the DMRS is... Alternatively, DMRS uses the RE index.

[0229] Where n′ is the index of the symbol in the sequence used to generate DMRS, and the value of n′ ranges from 1 to 2. Y equals the length of the sequence used to generate the DMRS minus one, k′ equals 0 and 1, Δ equals 0, 2, or 4, and p is an adjustment value, greater than 0 and less than or equal to 1. Optionally, p = 0.5. That is, the frequency domain density of the DMRS is p times the frequency domain density of type 2 DMRS.

[0230] For example, as shown in Figure 9A, for the first DMRS, Δ = 0, meaning the offset of the starting RE occupied by the first DMRS relative to the starting RE of the PDSCH is 0, i.e., the starting RE occupied by the first DMRS is located at the starting RE of the PDSCH. p = 0.5, Y = 6, therefore the value range of n′ is [0, 3). The index of the RE occupied by the DMRS... When n′=0 and k′=0, k=0; when n′=0 and k′=1, k=1; when n′=1 and k′=0, k=12, at which point k exceeds the index size of the REs included in the RB as shown in Figure 9A. When the value of n′ is equal to 2, the value of k exceeds the index size of the REs included in the RB as shown in Figure 9A. Therefore, it can be known that the REs occupied by the first DMRS include RE0 and RE1. As shown in Figure 9A, the first DMRS occupies RE0 and RE1 in time domain symbol 2 and time domain symbol 3, respectively. The process of determining the index of the REs occupied by the second and third DMRS is similar, and will not be illustrated here.

[0231] It should be noted that the formula for the index of REs occupied by the DMRS described above is only one example. In practical applications, the formula can also be used to calculate the index of REs occupied by the DMRS. For example, as shown in Figure 9B, the terminal device can calculate the index of REs occupied by the first DMRS, the index of REs occupied by the second DMRS, and the index of REs occupied by the third DMRS using other formulas. As shown in Figure 9B, the first DMRS can occupy RE6 and RE7 in time domain symbol 2 and time domain symbol 3, respectively. The second DMRS can occupy RE8 and RE9 in time domain symbol 2 and time domain symbol 3, respectively. The third DMRS can occupy RE10 and RE11 in time domain symbol 2 and time domain symbol 3, respectively.

[0232] 3. The frequency domain resources occupied by DMRS include REs occupied by DMRS. When the type of DMRS is type 1, the index k of the RE occupied by DMRS is p(4n′)+2k′+Δ, or the index k of the RE occupied by DMRS is p(4n′+2k′)+Δ.

[0233] Where n′ is the index of the symbol in the sequence used to generate DMRS, and the value of n′ ranges from 1 to 2. Y equals the length of the sequence used to generate the DMRS minus one, k′ equals 0 and 1, Δ equals 0 or 1, and p is an adjustment value, where p is an integer greater than or equal to 1. Optionally, p = 2. That is, the frequency domain density of the DMRS is 1 / p times the frequency domain density of a type 1 DMRS.

[0234] For example, as shown in Figure 8A, for the first DMRS, Δ = 0, meaning the offset of the starting RE occupied by the first DMRS relative to the starting RE of the PDSCH is 0, i.e., the starting RE occupied by the first DMRS is located at the starting RE of the PDSCH. p = 2, Y = 6, therefore the value range of n′ is [0, 3). The index k of the RE occupied by the DMRS is k = p(4n′) + 2k′ + Δ. When n′ = 0, k′ = 0, k = 0; when n′ = 0, k′ = 1, k = 2; when n′ = 1, k′ = 0, k = 8; when n′ = 1, k′ = 1, k = 10. When the value of n′ is equal to 2, the value of k exceeds the index size of the REs included in the RB shown in Figure 8A. Therefore, it can be known that the REs occupied by the first DMRS include RE0, RE2, RE8, and RE10. As shown in Figure 8A, the first DMRS occupies RE0, RE2, RE8, and RE10 in time domain symbol 2 and time domain symbol 3, respectively. For example, for the second DMRS, Δ = 1, meaning the offset of the starting RE occupied by the second DMRS relative to the starting RE of the PDSCH is 1. p = 0.5, Y = 6, therefore the value range of n′ is [0, 3). The index of the RE occupied by the DMRS. When n′=0, k′=0, k=1; when n′=0, k′=1, k=3; when n′=2, k′=0, k=9; when n′=1, k′=11. When n′ is equal to 2, the value of k exceeds the index size of the REs included in the RB shown in Figure 8A. Therefore, it can be known that the REs occupied by the second DMRS include RE1, RE3, RE9, and RE11. As shown in Figure 8A, the second DMRS occupies RE1, RE3, RE9, and RE11 in time domain symbol 2 and time domain symbol 3, respectively.

[0235] For example, as shown in Figure 8B, for the first DMRS, Δ = 0, meaning the offset of the starting RE occupied by the first DMRS relative to the starting RE of the PDSCH is 0, i.e., the starting RE occupied by the first DMRS is located at the starting RE of the PDSCH. p = 0.5, Y = 6, therefore the value range of n′n is [0, 3). The index k of the RE occupied by the DMRS is k = p(4n′ + 2k′) + Δ. When n′ = 0, k′ = 0, k = 0; when n′ = 0, k′ = 1, k = 4; when n′ = 1, k′ = 0, k = 8. When n′ = 1, k′ = 1, k = 12, at which point k exceeds the index size of the REs included in the RB shown in Figure 8B. When the value of n′ is equal to 2, the value of k exceeds the index size of the REs included in the RB shown in Figure 8B. Therefore, it can be known that the REs occupied by the first DMRS include RE0, RE4, and RE8. As shown in Figure 8B, the first DMRS occupies RE0, RE4, and RE8 in time domain symbols 2 and 3, respectively. For example, as shown in Figure 8B, for the second DMRS, Δ = 1, meaning the offset of the starting RE occupied by the second DMRS relative to the starting RE of the PDSCH is 1. p = 0.5, Y = 6, therefore the value range of n′n is [0, 3). The index k of the REs occupied by the DMRS is k = p(4n′ + 2k′) + Δ. When n′ = 0, k′ = 0, k = 1; when n′ = 0, k′ = 1, k = 5; when n′ = 1, k′ = 0, k = 9. When n′ = 1, k′ = 1, k = 13, at which point k exceeds the index size of the REs included in the RB shown in Figure 8B. When the value of n′ is equal to 2, the value of k exceeds the index size of the REs included in the RB shown in Figure 8B. Therefore, it can be known that the REs occupied by the second DMRS include RE1, RE5, and RE9. As shown in Figure 8B, the second DMRS occupies RE1, RE5 and RE9 on time domain symbols 2 and 3, respectively.

[0236] It should be noted that the formula for the index of REs occupied by the DMRS described above is merely an example. In practical applications, the formula can also be used to calculate the index of REs occupied by the DMRS. For example, as shown in Figure 8C, the terminal device calculates the REs occupied by the first DMRS using other formulas, including RE2, RE6, and RE10. That is, the first DMRS occupies RE2, RE6, and RE10 in time domain symbol 2 and time domain symbol 3, respectively. The terminal device calculates the REs occupied by the second DMRS using other formulas, including RE3, RE7, and RE11. That is, the second DMRS occupies RE3, RE7, and RE11 in time domain symbol 2 and time domain symbol 3, respectively.

[0237] IV. The frequency domain resources occupied by DMRS include REs occupied by DMRS. When the type of DMRS is type 2, the index k of the RE occupied by DMRS is p(6n′+k′)+Δ, or the index k of the RE occupied by DMRS is p(6n′)+2k′+Δ.

[0238] Where n′ is the index of the symbol in the sequence used to generate DMRS, and the value of n′ ranges from 1 to 2. Y equals the sequence length minus one, k′ equals 0 and 1, Δ equals 0 or 1, and p is the adjustment amount, where p is an integer greater than or equal to 1. Optionally, p = 2. That is, the frequency domain density of the DMRS is 1 / p times the frequency domain density of type 2 DMRS.

[0239] For example, as shown in Figure 9A, for the first DMRS, Δ = 0, meaning the offset of the starting RE occupied by the first DMRS relative to the starting RE of the PDSCH is 0, i.e., the starting RE occupied by the first DMRS is located at the starting RE of the PDSCH. p = 0.5, Y = 6, therefore the value range of n′n is [0, 2). The index k of the RE occupied by the DMRS is k = p(6n′ + k′) + Δ. When n′ = 0, k′ = 0, k = 0; when n′ = 0, k′ = 1, k = 1; when n′ = 1, k′ = 0, k = 12, at which point k exceeds the index size of the REs included in the RB as shown in Figure 9A. When the value of n′ is equal to 2, the value of k exceeds the index size of the REs included in the RB as shown in Figure 9A. Therefore, it can be known that the REs occupied by the first DMRS include RE0 and RE1. As shown in Figure 9A, the first DMRS occupies RE0 and RE1 in time domain symbol 2 and time domain symbol 3, respectively. The process for determining the indexes of the REs occupied by the second and third DMRS is similar, and will not be illustrated here.

[0240] It should be noted that the formula for the index of REs occupied by the DMRS described above is only one example. In practical applications, the formula can also be used to calculate the index of REs occupied by the DMRS. For example, as shown in Figure 9B, the terminal device can calculate the index of REs occupied by the first DMRS, the index of REs occupied by the second DMRS, and the index of REs occupied by the third DMRS using other formulas. As shown in Figure 9B, the first DMRS can occupy RE6 and RE7 in time domain symbol 2 and time domain symbol 3, respectively. The second DMRS can occupy RE8 and RE9 in time domain symbol 2 and time domain symbol 3, respectively. The third DMRS can occupy RE10 and RE11 in time domain symbol 2 and time domain symbol 3, respectively.

[0241] Accordingly, the network device determines the frequency domain resources occupied by the DMRS based on the DMRS type and the first indication information. Alternatively, the network device determines the frequency domain density of the DMRS based on the DMRS type and the first indication information, and then determines the frequency domain density occupied by the DMRS based on the DMRS frequency domain density. For the specific determination method, please refer to the process of the terminal device determining the frequency domain resources occupied by the DMRS in step 702 above, which will not be repeated here.

[0242] 703. Network devices send DMRS to terminal devices using the frequency domain resources occupied by DMRS. Correspondingly, terminal devices receive DMRS from network devices using the frequency domain resources occupied by DMRS.

[0243] After receiving the DMRS, the terminal device parses the DMRS so that it can receive the PDSCH from the network device.

[0244] In this embodiment, the terminal device receives first indication information from the network device, which indicates the adjustment amount for adjusting the frequency domain density of the DMRS. Then, the terminal device determines the frequency domain resources occupied by the DMRS based on the type of the DMRS and the first indication information; the DMRS type is either type 1 or type 2. The terminal device receives the DMRS from the network device using the frequency domain resources occupied by the DMRS. Thus, the terminal device receives the first indication information from the network device, which indicates the adjustment amount for adjusting the frequency domain density of the DMRS. This enables flexible adjustment of the DMRS frequency domain density. The terminal device determines the frequency domain resources occupied by the DMRS based on the type of the DMRS and the first indication information, and then receives the DMRS from the network device using these resources. This allows for adjustment (e.g., reduction) of the DMRS frequency domain density through the first indication information when channel frequency selection is weak, avoiding waste of DMRS resources and improving the utilization rate of DMRS resources.

[0245] Figure 10 is a schematic diagram of another embodiment of the DMRS transmission method and DMRS reception method of this application. Referring to Figure 10, the method includes:

[0246] 1001. The network device sends a second instruction message to the terminal device. Correspondingly, the terminal device receives the second instruction message from the network device.

[0247] The second indication information is used to indicate the type of DMRS. The frequency domain density of the DMRS is different from that of Type 1 DMRS. In other words, the type of DMRS is different from Type 1 and Type 2; that is, the type of DMRS is a newly defined type, and its frequency domain density is different from that of Type 1 DMRS and Type 2 DMRS. For example, a new DMRS type is specified in the communication protocol, such as Type 3 and Type 4, or Type 1a and Type 2a. Type 3 and Type 4, or Type 1a and Type 2a, will be described later. In this application, the names of Type 3, Type 4, Type 1a, and Type 2a are not limited; they are merely examples.

[0248] In one possible implementation, the frequency domain density of the DMRS is p times the frequency domain density of the Type 1 DMRS. Please refer to the aforementioned introduction for Type 1 DMRS. Here, p is greater than 0 and less than or equal to 1. If p equals 1, the frequency domain density of the DMRS is equal to the frequency domain density of the Type 1 DMRS. If p is greater than 0 and less than 1, the frequency domain density of the DMRS is less than the frequency domain density of the Type 1 DMRS. This type of DMRS can be understood as either Type 3 or Type 1a, newly defined in the communication protocol.

[0249] In another possible implementation, the frequency domain density of the DMRS is 1 / p times the frequency domain density of the Type 1 DMRS. Please refer to the preceding introduction for Type 1 DMRS. Here, p is an integer greater than or equal to 1. If p equals 1, the frequency domain density of the DMRS is equal to the frequency domain density of the Type 1 DMRS. If p is an integer greater than 1, the frequency domain density of the DMRS is less than the frequency domain density of the Type 1 DMRS. This type of DMRS can be understood as either Type 3 or Type 1a, newly defined in the communication protocol.

[0250] In another possible implementation, the frequency domain density of the DMRS is p times the frequency domain density of type 2 DMRS. Please refer to the aforementioned introduction for information on type 2 DMRS. Here, p is greater than 0 and less than or equal to 1. If p equals 1, the frequency domain density of the DMRS is equal to the frequency domain density of type 2 DMRS. If p is greater than 0 and less than 1, the frequency domain density of the DMRS is less than the frequency domain density of type 2 DMRS. This type of DMRS can be understood as a newly defined type 4 or type 2a in the communication protocol.

[0251] In another possible implementation, the frequency domain density of the DMRS is 1 / p times the frequency domain density of type 2 DMRS. Please refer to the preceding introduction for information on type 2 DMRS. Here, p is an integer greater than or equal to 1. If p equals 1, the frequency domain density of the DMRS is equal to the frequency domain density of type 2 DMRS. If p is an integer greater than 1, the frequency domain density of the DMRS is less than the frequency domain density of type 2 DMRS. This type of DMRS can be understood as either type 4 or type 2a, newly defined in the communication protocol.

[0252] Optionally, the second indication information may be called frequency domain density indication or frequency domain density sparse indication, and this application does not limit the specific meaning.

[0253] Optionally, the second indication information is carried in the DCI, or the second indication information is carried in the configuration information of the DMRS.

[0254] For the case where the second indication information is carried in the DCI, optionally, the embodiment shown in FIG10 further includes step 1001a. Step 1001a may be performed before step 1001.

[0255] 1001a. The network device sends DMRS configuration information to the terminal device. Correspondingly, the terminal device receives the DMRS configuration information from the network device.

[0256] Optionally, the DMRS configuration information includes the maximum number of time-domain symbols occupied by the DMRS.

[0257] Optionally, the embodiment shown in FIG10 further includes step 1001b. Step 1001b may be performed before step 1001.

[0258] 1001b. The terminal device sends capability information to the network device. Correspondingly, the network device receives the capability information from the terminal device.

[0259] The capability information indicates at least one of the following: the frequency domain density of the DMRS that the terminal device supports measuring, the range to which the frequency domain density of the DMRS that the terminal device supports measuring, or the type of DMRS that the terminal device supports measuring. For example, the frequency domain density of the DMRS that the terminal device supports measuring is 1 / 2, 1 / 3, 1 / 4, or 1 / 6, etc. Another example is that the types of DMRS that the terminal device supports measuring include Type 1, Type 2, Type 3, and Type 4. Alternatively, the types of DMRS that the terminal device supports measuring include Type 1, Type 2, Type 1a, and Type 2a.

[0260] It should be noted that if the embodiment shown in Figure 10 further includes step 1001a, there is no fixed execution order between steps 1001a and 1001b. Step 1001a can be executed first, followed by step 1001b; or step 1001b can be executed first, followed by step 1001a; or, depending on the circumstances, steps 1001a and 1001b can be executed simultaneously. This application does not impose any specific limitations on this.

[0261] 1002. The terminal device determines the frequency domain resources occupied by the DMRS based on the type of DMRS indicated by the second instruction information.

[0262] Optionally, the terminal device determines the frequency domain density of the DMRS based on the type of DMRS indicated by the second indication information, and then determines the frequency domain resources occupied by the DMRS based on the frequency domain density of the DMRS.

[0263] Below are some possible implementation methods for step 1002 above.

[0264] I. The frequency domain resources occupied by the DMRS include the resource units (REs) occupied by the DMRS. When the frequency domain density of the DMRS is p times the frequency domain density of a type 1 DMRS, where p is greater than 0 and less than or equal to 1, the index of the REs occupied by the DMRS is... Alternatively, DMRS uses the RE index. For a DMRS whose frequency domain density is p times that of a type 1 DMRS, the type of the DMRS can be called type 3 or type 1a.

[0265] Where n′ is the index of the symbol in the sequence used to generate DMRS, and the value of n′ ranges from 1 to 2. Y equals the length of the sequence used to generate DMRS minus one, k′ equals 0 and 1, and Δ equals 0 or 1. Optionally, p = 0.5.

[0266] For example, as shown in Figure 8A, for the first DMRS, Δ = 0, meaning the offset of the starting RE occupied by the first DMRS relative to the starting RE of the PDSCH is 0, i.e., the starting RE occupied by the first DMRS is located at the starting RE of the PDSCH. p = 0.5, Y = 6, therefore the value range of n′ is [0, 3). The index of the RE occupied by the DMRS... When n′=0, k′=0, k=0; when n′=0, k′=1, k=2; when n′=1, k′=0, k=8; when n′=1, k′=1, k=10. When n′ is equal to 2, the value of k exceeds the index size of the REs included in the RB shown in Figure 8A. Therefore, it can be seen that the REs occupied by the first DMRS include RE0, RE2, RE8, and RE10. As shown in Figure 8A, the first DMRS occupies RE0, RE2, RE8, and RE10 in time domain symbol 2 and time domain symbol 3, respectively. For example, for the second DMRS, Δ=1, that is, the offset of the starting RE occupied by the second DMRS relative to the starting RE of the PDSCH is 1. p=0.5, Y=6, therefore the value range of n′ is [0,3). The index of the REs occupied by the DMRS When n′=0, k′=0, k=1; when n′=0, k′=1, k=3; when n′=2, k′=0, k=9; when n′=1, k′=11. When n′ is equal to 2, the value of k exceeds the index size of the REs included in the RB shown in Figure 8A. Therefore, it can be known that the REs occupied by the second DMRS include RE1, RE3, RE9, and RE11. As shown in Figure 8A, the second DMRS occupies RE1, RE3, RE9, and RE11 in time domain symbol 2 and time domain symbol 3, respectively.

[0267] For example, as shown in Figure 8B, for the first DMRS, Δ = 0, meaning the offset of the starting RE occupied by the first DMRS relative to the starting RE of the PDSCH is 0, i.e., the starting RE occupied by the first DMRS is located at the starting RE of the PDSCH. p = 0.5, Y = 6, therefore the value range of n′ is [0, 3). The index of the RE occupied by the DMRS... When n′=0, k′=0, k=0; when n′=0, k′=1, k=4; when n′=1, k′=0, k=8. When n′=1, k′=1, k=12, at which point k exceeds the index size of the REs included in the RB shown in Figure 8B. When the value of n′ is equal to 2, the value of k exceeds the index size of the REs included in the RB shown in Figure 8B. Therefore, it can be known that the REs occupied by the first DMRS include RE0, RE4, and RE8. As shown in Figure 8B, the first DMRS occupies RE0, RE4, and RE8 in time domain symbols 2 and 3, respectively. For example, as shown in Figure 8B, for the second DMRS, Δ=1, that is, the offset of the starting REs occupied by the second DMRS relative to the starting REs of the PDSCH is 1. p=0.5, Y=6, therefore the value range of n′n is [0,3). The index of the REs occupied by the DMRS When n′=0, k′=0, k=1; when n′=0, k′=1, k=5; when n′=1, k′=0, k=9. When n′=1, k′=1, k=13, at which point k exceeds the index size of the REs included in the RB shown in Figure 8B. When the value of n′ is equal to 2, the value of k exceeds the index size of the REs included in the RB shown in Figure 8B. Therefore, it can be known that the REs occupied by the second DMRS include RE1, RE5, and RE9. As shown in Figure 8B, the second DMRS occupies RE1, RE5, and RE9 in time domain symbol 2 and time domain symbol 3, respectively.

[0268] It should be noted that the formula for the index of REs occupied by the DMRS described above is merely an example. In practical applications, the formula can also be used to calculate the index of REs occupied by the DMRS. For example, as shown in Figure 8C, the terminal device calculates the REs occupied by the first DMRS using other formulas, including RE2, RE6, and RE10. That is, the first DMRS occupies RE2, RE6, and RE10 in time domain symbol 2 and time domain symbol 3, respectively. The terminal device calculates the REs occupied by the second DMRS using other formulas, including RE3, RE7, and RE11. That is, the second DMRS occupies RE3, RE7, and RE11 in time domain symbol 2 and time domain symbol 3, respectively.

[0269] II. The frequency domain resources occupied by DMRS include the REs occupied by DMRS. When the frequency domain density corresponding to the type of DMRS is p times the frequency domain density of type 2 DMRS, where p is greater than 0 and less than or equal to 1, the index of the REs occupied by the DMRS is... Alternatively, DMRS uses the RE index.

[0270] Where n′ is the index of the symbol in the sequence used to generate DMRS, and the value of n′ ranges from 1 to 2. Y equals the length of the sequence used to generate the DMRS minus one, k′ equals 0 and 1, and Δ equals 0, 2, or 4. For a DMRS whose frequency domain density is p times that of a type 2 DMRS, the type of the DMRS can be called type 4 or type 2a.

[0271] For example, as shown in Figure 9A, for the first DMRS, Δ = 0, meaning the offset of the starting RE occupied by the first DMRS relative to the starting RE of the PDSCH is 0, i.e., the starting RE occupied by the first DMRS is located at the starting RE of the PDSCH. p = 0.5, Y = 6, therefore the value range of n′ is [0, 3). The index of the RE occupied by the DMRS... When n′=0 and k′=0, k=0; when n′=0 and k′=1, k=1; when n′=1 and k′=0, k=12, at which point k exceeds the index size of the REs included in the RB as shown in Figure 9A. When the value of n′ is equal to 2, the value of k exceeds the index size of the REs included in the RB as shown in Figure 9A. Therefore, it can be known that the REs occupied by the first DMRS include RE0 and RE1. As shown in Figure 9A, the first DMRS occupies RE0 and RE1 in time domain symbol 2 and time domain symbol 3, respectively. The process of determining the index of the REs occupied by the second and third DMRS is similar, and will not be illustrated here.

[0272] It should be noted that the formula for the RE index occupied by the DMRS described above is only one example. In practical applications, the formula can also be used to calculate the RE index occupied by the DMRS. For example, other formulas can be used to calculate the RE index occupied by the DMRS. For example, as shown in Figure 9B, the first DMRS can occupy RE6 and RE7 in time domain symbol 2 and time domain symbol 3, respectively. The second DMRS can occupy RE8 and RE9 in time domain symbol 2 and time domain symbol 3, respectively. The third DMRS can occupy RE10 and RE11 in time domain symbol 2 and time domain symbol 3, respectively.

[0273] 3. The frequency domain resources occupied by the DMRS include the REs occupied by the DMRS. When the frequency domain density of the DMRS is 1 / p times the frequency domain density of the Type 1 DMRS, where p is an integer greater than or equal to 1, the index k of the REs occupied by the DMRS is p(4n′) + 2k′ + Δ, or the index k of the REs occupied by the DMRS is p(4n′ + 2k′) + Δ.

[0274] Where n′ is the index of the symbol in the sequence used to generate DMRS, and the value of n′ ranges from 1 to 2. Y equals the length of the sequence used to generate the DMRS minus one, k′ equals 0 and 1, and Δ equals 0 or 1. For a DMRS whose frequency domain density is 1 / p times that of a type 1 DMRS, the type of the DMRS can be called type 3 or type 1a. Optionally, p = 2.

[0275] For example, as shown in Figure 8A, for the first DMRS, Δ = 0, meaning the offset of the starting RE occupied by the first DMRS relative to the starting RE of the PDSCH is 0, i.e., the starting RE occupied by the first DMRS is located at the starting RE of the PDSCH. p = 2, Y = 6, therefore the value range of n′ is [0, 3). The index k of the RE occupied by the DMRS is k = p(4n′) + 2k′ + Δ. When n′ = 0, k′ = 0, k = 0; when n′ = 0, k′ = 1, k = 2; when n′ = 1, k′ = 0, k = 8; when n′ = 1, k′ = 1, k = 10. When the value of n′ is equal to 2, the value of k exceeds the index size of the REs included in the RB shown in Figure 8A. Therefore, it can be known that the REs occupied by the first DMRS include RE0, RE2, RE8, and RE10. As shown in Figure 8A, the first DMRS occupies RE0, RE2, RE8, and RE10 in time domain symbol 2 and time domain symbol 3, respectively. For example, for the second DMRS, Δ = 1, meaning the offset of the starting RE occupied by the second DMRS relative to the starting RE of the PDSCH is 1. p = 0.5, Y = 6, therefore the value range of n′ is [0, 3). The index of the RE occupied by the DMRS. When n′=0, k′=0, k=1; when n′=0, k′=1, k=3; when n′=2, k′=0, k=9; when n′=1, k′=11. When n′ is equal to 2, the value of k exceeds the index size of the REs included in the RB shown in Figure 8A. Therefore, it can be known that the REs occupied by the second DMRS include RE1, RE3, RE9, and RE11. As shown in Figure 8A, the second DMRS occupies RE1, RE3, RE9, and RE11 in time domain symbol 2 and time domain symbol 3, respectively.

[0276] For example, as shown in Figure 8B, for the first DMRS, Δ = 0, meaning the offset of the starting RE occupied by the first DMRS relative to the starting RE of the PDSCH is 0, i.e., the starting RE occupied by the first DMRS is located at the starting RE of the PDSCH. p = 0.5, Y = 6, therefore the value range of n′ is [0, 3). The index k of the RE occupied by the DMRS is k = p(4n′ + 2k′) + Δ. When n′ = 0, k′ = 0, k = 0; when n′ = 0, k′ = 1, k = 4; when n′ = 1, k′ = 0, k = 8. When n′ = 1, k′ = 1, k = 12, at which point k exceeds the index size of the REs included in the RB shown in Figure 8B. When the value of n′ is equal to 2, the value of k exceeds the index size of the REs included in the RB shown in Figure 8B. Therefore, it can be known that the REs occupied by the first DMRS include RE0, RE4, and RE8. As shown in Figure 8B, the first DMRS occupies RE0, RE4, and RE8 in time domain symbols 2 and 3, respectively. For example, as shown in Figure 8B, for the second DMRS, Δ = 1, meaning the offset of the starting RE occupied by the second DMRS relative to the starting RE of the PDSCH is 1. p = 0.5, Y = 6, therefore the value range of n′n is [0, 3). The index k of the REs occupied by the DMRS is k = p(4n′ + 2k′) + Δ. When n′ = 0, k′ = 0, k = 1; when n′ = 0, k′ = 1, k = 5; when n′ = 1, k′ = 0, k = 9. When n′ = 1, k′ = 1, k = 13, at which point k exceeds the index size of the REs included in the RB shown in Figure 8B. When the value of n′ is equal to 2, the value of k exceeds the index size of the REs included in the RB shown in Figure 8B. Therefore, it can be known that the REs occupied by the second DMRS include RE1, RE5, and RE9. As shown in Figure 8B, the second DMRS occupies RE1, RE5 and RE9 on time domain symbols 2 and 3, respectively.

[0277] It should be noted that the formula for the index of REs occupied by the DMRS described above is merely an example. In practical applications, the formula can also be used to calculate the index of REs occupied by the DMRS. For example, as shown in Figure 8C, the terminal device calculates the REs occupied by the first DMRS using other formulas, including RE2, RE6, and RE10. That is, the first DMRS occupies RE2, RE6, and RE10 in time domain symbol 2 and time domain symbol 3, respectively. The terminal device calculates the REs occupied by the second DMRS using other formulas, including RE3, RE7, and RE11. That is, the second DMRS occupies RE3, RE7, and RE11 in time domain symbol 2 and time domain symbol 3, respectively.

[0278] IV. The frequency domain resources occupied by DMRS include REs occupied by DMRS. When the frequency domain density corresponding to the type of DMRS is 1 / p times the frequency domain density of type 2 DMRS, where p is an integer greater than or equal to 1, the index k of the REs occupied by DMRS is p(6n′)+k′+Δ, or the index k of the REs occupied by DMRS is p(6n′+k′)+Δ.

[0279] Where n′ is the index of the symbol in the sequence used to generate DMRS, and the value of n′ ranges from 1 to 2. Y equals the length of the sequence used to generate the DMRS minus one, k′ equals 0 and 1, and Δ equals 0, 2, or 4. Optionally, p = 2. For a DMRS whose frequency domain density is 1 / p times that of a type 2 DMRS, the type of the DMRS can be called type 4 or type 2a.

[0280] For example, as shown in Figure 9A, for the first DMRS, Δ = 0, meaning the offset of the starting RE occupied by the first DMRS relative to the starting RE of the PDSCH is 0, i.e., the starting RE occupied by the first DMRS is located at the starting RE of the PDSCH. p = 0.5, Y = 6, therefore the value range of n′ is [0, 3). The index k of the RE occupied by the DMRS is k = p(6n′ + k′) + Δ. When n′ = 0, k′ = 0, k = 0; when n′ = 0, k′ = 1, k = 1; when n′ = 1, k′ = 0, k = 12, at which point k exceeds the index size of the REs included in the RB as shown in Figure 9A. When the value of n′ is equal to 2, the value of k exceeds the index size of the REs included in the RB as shown in Figure 9A. Therefore, it can be known that the REs occupied by the first DMRS include RE0 and RE1. As shown in Figure 9A, the first DMRS occupies RE0 and RE1 in time domain symbol 2 and time domain symbol 3, respectively. The process for determining the indexes of the REs occupied by the second and third DMRS is similar, and will not be illustrated here.

[0281] It should be noted that the formula for the RE index occupied by the DMRS described above is only one example. In practical applications, the formula can also be used to calculate the RE index occupied by the DMRS. For example, other formulas can be used to calculate the RE index occupied by the DMRS. For example, as shown in Figure 9B, the first DMRS can occupy RE6 and RE7 in time domain symbol 2 and time domain symbol 3, respectively. The second DMRS can occupy RE8 and RE9 in time domain symbol 2 and time domain symbol 3, respectively. The third DMRS can occupy RE10 and RE11 in time domain symbol 2 and time domain symbol 3, respectively.

[0282] Accordingly, the network device determines the frequency domain resources occupied by the DMRS based on the type of DMRS. For details on the determination method, please refer to step 1002 above regarding the process of determining the frequency domain resources occupied by the terminal device's DMRS; it will not be repeated here.

[0283] 1003. Network devices send DMRS to terminal devices using the frequency domain resources occupied by DMRS. Correspondingly, terminal devices receive DMRS from network devices using the frequency domain resources occupied by DMRS.

[0284] After receiving the DMRS, the terminal device parses the DMRS so that it can receive the PDSCH from the network device.

[0285] In this embodiment, the terminal device receives second indication information from the network device. This second indication information indicates the type of DMRS, and the frequency domain density of the DMRS is different from that of type 1 DMRS and type 2 DMRS. The terminal device determines the frequency domain resources occupied by the DMRS based on its type. The terminal device receives the DMRS from the network device using the frequency domain resources occupied by the DMRS. Therefore, the terminal device can receive the second indication information, which indicates the type of DMRS, and that the frequency domain density of the DMRS is different from that of type 1 DMRS and type 2 DMRS. This allows for indication of DMRS types different from type 1 and type 2 DMRS, thus enabling flexible adjustment of the DMRS frequency domain density. In cases of weak channel frequency selection, the second indication information can be used to adjust (e.g., reduce) the DMRS frequency domain density, avoiding waste of DMRS resources and improving DMRS resource utilization.

[0286] Figure 11 is a schematic diagram of another embodiment of the DMRS transmission method and DMRS reception method of this application. Referring to Figure 11, the method includes:

[0287] 1101. The network device sends a first instruction message to the terminal device. Correspondingly, the terminal device receives the first instruction message from the network device.

[0288] The first indication information indicates the adjustment amount used to adjust the frequency domain density of the DMRS.

[0289] Step 1101 is similar to step 701 in the embodiment shown in Figure 7 above. For details, please refer to the relevant description of step 701 in the embodiment shown in Figure 7 above, which will not be repeated here.

[0290] Optionally, the first indication information is carried in the DCI, or the first indication information is carried in the configuration information of the DMRS.

[0291] In the case where the first indication information is carried in a DCI, optionally, the embodiment shown in FIG11 further includes step 1101a. Step 1101a may be performed before step 1101.

[0292] 1101a. The network device sends DMRS configuration information to the terminal device. Correspondingly, the terminal device receives the DMRS configuration information from the network device.

[0293] Step 1101a is similar to step 701a in the embodiment shown in Figure 7 above. For details, please refer to the relevant description of step 701a in the embodiment shown in Figure 7 above, which will not be repeated here.

[0294] Optionally, the embodiment shown in FIG11 further includes step 1101b.

[0295] 1101b. The terminal device sends capability information to the network device. Correspondingly, the network device receives the capability information from the terminal device.

[0296] Step 1101b is similar to step 701b in the embodiment shown in Figure 7 above. For details, please refer to the relevant description of step 701b in the embodiment shown in Figure 7 above, which will not be repeated here.

[0297] 1102. The terminal equipment determines the frequency domain density of the DMRS based on the type of DMRS and the first indication information.

[0298] The DMRS type is either Type 1 or Type 2. Alternatively, it can be described as Type 1 DMRS or Type 2 DMRS. Please refer to the preceding sections for details on Type 1 DMRS and Type 2 DMRS.

[0299] In one possible implementation, the adjustment amount indicated by the first indication information is p, where p is greater than 0 and less than 1. If the DMRS type is Type 1, then the frequency domain density of the DMRS is p times the frequency domain density of a Type 1 DMRS. Optionally, p = 0.5.

[0300] In another possible implementation, the adjustment amount indicated by the first indication information is p, where p is greater than 0 and less than 1. If the DMRS type is type 2, then the frequency domain density of the DMRS is p times the frequency domain density of type 2 DMRS. Optionally, p = 0.5.

[0301] In another possible implementation, the adjustment amount indicated by the first indication information is p, where p is an integer greater than 1. When the DMRS type is type 1, the frequency domain density of the DMRS is equal to 1 / p times the frequency domain density of the type 1 DMRS. Optionally, p = 2.

[0302] In another possible implementation, the adjustment amount indicated by the first indication information is p, where p is an integer greater than 1. When the DMRS type is type 2, the frequency domain density of the DMRS is equal to 1 / p times the frequency domain density of type 2 DMRS. Optionally, p = 2.

[0303] Correspondingly, the network device determines the frequency domain density of the DMRS. The specific determination method is similar to the process by which the terminal device determines the frequency domain density of the DMRS based on the type of DMRS. Please refer to the relevant introduction above, which will not be repeated here.

[0304] 1103. The network device sends the DMRS to the terminal device according to the frequency domain density of the DMRS. Correspondingly, the terminal device receives the DMRS from the network device according to the frequency domain density of the DMRS.

[0305] The pattern corresponding to the frequency domain density of the DMRS includes: the DMRS occupying one or more time domain symbols; when the DMRS is a type 1 DMRS or when the type of the DMRS is type 1, the number of resource units (REs) occupied by the DMRS on each time domain symbol is less than the number of REs occupied on each time domain symbol in the pattern corresponding to the frequency domain density of the type 1 DMRS; when the DMRS is a type 2 DMRS or when the type of the DMRS is type 2, the number of REs occupied by the DMRS on each time domain symbol is less than the number of REs occupied on each time domain symbol in the pattern corresponding to the frequency domain density of the type 2 DMRS.

[0306] Optionally, when the DMRS is type 1 DMRS, the REs occupied by the DMRS in each time domain symbol overlap with those occupied by the type 1 DMRS in each time domain symbol. In other words, the REs occupied by the DMRS in each time domain symbol belong to the REs occupied by the type 1 DMRS in each time domain symbol. For example, as shown in Figure 5, the frequency domain density of DMRS1 is 1 / 2, and the REs that DMRS1 can occupy include RE0, RE2, RE4, RE6, RE8, and RE10. As shown in Figure 8A, the offset of the starting REs occupied by the first DMRS relative to the starting REs of the PDSCH is 0, meaning the starting REs occupied by the first DMRS are located at the starting REs of the PDSCH. The frequency domain density of the first DMRS is 1 / 2 of the frequency domain density of the type 1 DMRS, i.e., the frequency domain density of the first DMRS is 1 / 4. Therefore, the REs that the first DMRS can occupy include RE0, RE4, and RE8, meaning the REs occupied by the first DMRS are a portion of the REs occupied by DMRS1. The REs occupied by the second DMRS shown in Figure 8A are similar to those occupied by DMRS2 shown in Figure 5.

[0307] It should be noted that the above DMRS diagram is merely an example; other diagrams may be used in practical applications. For instance, as shown in Figure 8B, the terminal device determines that the REs occupied by the first DMRS include RE2, RE6, and RE10. That is, the first DMRS occupies RE2, RE6, and RE10 in time domain symbol 2 and time domain symbol 3, respectively. The terminal device determines that the REs occupied by the second DMRS include RE3, RE7, and RE11. That is, the second DMRS occupies RE3, RE7, and RE11 in time domain symbol 2 and time domain symbol 3, respectively.

[0308] Optionally, when the DMRS is type 2 DMRS, the REs occupied by the DMRS in each time domain symbol overlap with those occupied by the type 2 DMRS in each time domain symbol. In other words, the REs occupied by the DMRS in each time domain symbol belong to the REs occupied by the type 2 DMRS in each time domain symbol. For example, as shown in Figure 6, DMRS3 is type 2 DMRS, and its frequency domain density is 1 / 3. The REs that DMRS3 can occupy include RE0, RE1, RE6, and RE7. As shown in Figure 9A, the offset of the starting REs occupied by the first DMRS relative to the starting REs of the PDSCH is 0, meaning the starting REs occupied by the first DMRS are located at the starting REs of the PDSCH. The frequency domain density of the first DMRS is 1 / 2 of the frequency domain density of the type 2 DMRS, i.e., the frequency domain density of the first DMRS is 1 / 6. Therefore, the REs occupied by the first DMRS include RE0 and RE1, meaning the REs occupied by the first DMRS are a portion of the REs occupied by DMRS3. The REs occupied by the second DMRS shown in Figure 9A and the REs occupied by DMRS4 shown in Figure 6 are similar, as are the REs occupied by the third DMRS shown in Figure 9A and the REs occupied by DMRS5 shown in Figure 6.

[0309] It should be noted that the above DMRS diagram is merely an example; other diagrams can be used in practical applications. For instance, as shown in Figure 9B, the first DMRS can occupy RE6 and RE7 on time domain symbols 2 and 3, respectively. The second DMRS can occupy RE8 and RE9 on time domain symbols 2 and 3, respectively. The third DMRS can occupy RE10 and RE11 on time domain symbols 2 and 3, respectively.

[0310] Specifically, the network device determines the frequency domain resources occupied by the DMRS based on the frequency domain density of the DMRS, and sends the DMRS to the terminal device through the frequency domain resources occupied by the DMRS. Correspondingly, the terminal device determines the frequency domain resources occupied by the DMRS based on the frequency domain density of the DMRS, and receives the DMRS from the network device through the frequency domain resources occupied by the DMRS.

[0311] In this embodiment, the terminal device receives first indication information from the network device. The first indication information indicates the adjustment amount for adjusting the frequency domain density of the DMRS. Then, the terminal device determines the frequency domain density of the DMRS based on the type of the DMRS and the first indication information. The DMRS is either type 1 DMRS or type 2 DMRS. The terminal device receives the DMRS from the network device based on the frequency domain density of the DMRS. The pattern corresponding to the frequency domain density of the DMRS includes: the DMRS occupying one or more time domain symbols; when the DMRS is type 1 DMRS, the number of resource elements (REs) occupied by the DMRS on each time domain symbol is less than the number of REs occupied on each time domain symbol in the pattern corresponding to the frequency domain density of type 1 DMRS; when the DMRS is type 2 DMRS, the number of REs occupied by the DMRS on each time domain symbol is less than the number of REs occupied on each time domain symbol in the pattern corresponding to the frequency domain density of type 2 DMRS. This allows for flexible adjustment of the frequency domain density of the DMRS. In cases where channel frequency selection is weak, the frequency domain density of the DMRS can be adjusted (e.g., reduced) through the first indication information to avoid wasting DMRS resources, thereby improving the utilization rate of DMRS resources.

[0312] Figure 12 is a schematic diagram of another embodiment of the DMRS transmission method and DMRS reception method of this application. Referring to Figure 12, the method includes:

[0313] 1201. The network device sends a second instruction message to the terminal device. Correspondingly, the terminal device receives the second instruction message from the network device.

[0314] Step 1201 is similar to step 1001 in the embodiment shown in Figure 10 above. For details, please refer to the relevant description of step 1001 in the embodiment shown in Figure 10 above, which will not be repeated here.

[0315] Optionally, the second indication information is carried in the DCI, or the second indication information is carried in the configuration information of the DMRS.

[0316] For the case where the second indication information is carried in the DCI, optionally, the embodiment shown in FIG12 further includes step 1201a. Step 1201a may be performed before step 1201.

[0317] 1201a. The network device sends DMRS configuration information to the terminal device. Correspondingly, the terminal device receives the DMRS configuration information from the network device.

[0318] Optionally, the DMRS configuration information includes the maximum number of time-domain symbols occupied by the DMRS.

[0319] Optionally, the embodiment shown in FIG12 further includes step 1201b.

[0320] 1201b. The terminal device sends capability information to the network device. Correspondingly, the network device receives the capability information from the terminal device.

[0321] Optionally, the capability information includes at least one of the following: the frequency domain density of the DMRS that the terminal device supports measuring, the range to which the frequency domain density of the DMRS that the terminal device supports measuring belongs, or the type of DMRS that the terminal device supports measuring. For example, the frequency domain density of the DMRS that the terminal device supports measuring is 1 / 2, 1 / 3, 1 / 4, or 1 / 6, etc. Another example is that the types of DMRS that the terminal device supports measuring include Type 1, Type 2, Type 3, and Type 4. Alternatively, the types of DMRS that the terminal device supports measuring include Type 1, Type 2, Type 1a, and Type 2a.

[0322] Step 1201b is similar to step 1001b in the embodiment shown in Figure 10 above. For details, please refer to the relevant description of step 1001b in the embodiment shown in Figure 10 above, which will not be repeated here.

[0323] 1202. The terminal equipment determines the frequency domain density of the DMRS according to the type of DMRS.

[0324] In one possible implementation, the DMRS type includes: the frequency domain density of the DMRS is equal to p times the frequency domain density of type 1 DMRS or p times the frequency domain density of type 2 DMRS. p is greater than 0 and less than 1.

[0325] In another possible implementation, the DMRS type includes: the frequency domain density of the DMRS is equal to 1 / p times the frequency domain density of type 1 DMRS, or the frequency domain density of the DMRS is equal to 1 / p times the frequency domain density of type 2 DMRS. P is an integer greater than 1.

[0326] 1203. The network device sends the DMRS to the terminal device according to the frequency domain density of the DMRS. Correspondingly, the terminal device receives the DMRS from the network device according to the frequency domain density of the DMRS.

[0327] The pattern corresponding to the frequency domain density of DMRS includes: DMRS occupying one or more time domain symbols, the number of REs occupied by DMRS on each time domain symbol being less than the number of REs occupied on each time domain symbol in the pattern corresponding to the frequency domain density of type 1 DMRS, or the number of REs occupied by DMRS on each time domain symbol being less than the number of REs occupied on each time domain symbol in the pattern corresponding to the frequency domain density of type 2 DMRS.

[0328] Optionally, the REs occupied by the DMRS in each time-domain symbol overlap with those occupied by the Type 1 DMRS in each time-domain symbol. In other words, the REs occupied by the DMRS in each time-domain symbol belong to the REs occupied by the Type 1 DMRS in each time-domain symbol. For example, as shown in Figure 5, DMRS1 is a Type 1 DMRS. The frequency domain density of DMRS1 is 1 / 2, and the REs occupied by DMRS1 include RE0, RE2, RE4, RE6, RE8, and RE10. As shown in Figure 8A, the offset of the starting REs occupied by the first DMRS relative to the starting REs of the PDSCH is 0, meaning the starting REs occupied by the first DMRS are located at the starting REs of the PDSCH. The frequency domain density of the first DMRS is 1 / 2 of the frequency domain density of the Type 1 DMRS, i.e., the frequency domain density of the first DMRS is 1 / 4. Therefore, the REs that the first DMRS can occupy include RE0, RE4, and RE8, meaning the REs occupied by the first DMRS are a portion of the REs occupied by DMRS1. The REs occupied by the second DMRS shown in Figure 8A are similar to those occupied by DMRS2 shown in Figure 5.

[0329] It should be noted that the above DMRS diagram is merely an example; other diagrams may be used in practical applications. For instance, as shown in Figure 8B, the terminal device determines that the REs occupied by the first DMRS include RE2, RE6, and RE10. That is, the first DMRS occupies RE2, RE6, and RE10 in time domain symbol 2 and time domain symbol 3, respectively. The terminal device determines that the REs occupied by the second DMRS include RE3, RE7, and RE11. That is, the second DMRS occupies RE3, RE7, and RE11 in time domain symbol 2 and time domain symbol 3, respectively.

[0330] In this implementation, the REs occupied by DMRS on each time domain symbol are spaced at least two REs apart from each other.

[0331] Optionally, the REs occupied by DMRS in each time-domain symbol overlap with those occupied by Type 2 DMRS in each time-domain symbol. In other words, the REs occupied by DMRS in each time-domain symbol belong to the REs occupied by Type 2 DMRS in each time-domain symbol. For example, as shown in Figure 6, DMRS3 is a Type 2 DMRS, and its frequency domain density is 1 / 3. The REs that DMRS3 can occupy include RE0, RE1, RE6, and RE7. As shown in Figure 9A, the offset of the starting REs occupied by the first DMRS relative to the starting REs of the PDSCH is 0, meaning the starting REs occupied by the first DMRS are located at the starting REs of the PDSCH. The frequency domain density of the first DMRS is 1 / 2 of the frequency domain density of Type 2 DMRS, i.e., the frequency domain density of the first DMRS is 1 / 6. Therefore, the REs occupied by the first DMRS include RE0 and RE1, meaning the REs occupied by the first DMRS are a portion of the REs occupied by DMRS3. The REs occupied by the second DMRS shown in Figure 9A and the REs occupied by DMRS4 shown in Figure 6 are similar, as are the REs occupied by the third DMRS shown in Figure 9A and the REs occupied by DMRS5 shown in Figure 6.

[0332] It should be noted that the above DMRS diagram is merely an example; other diagrams can be used in practical applications. For instance, as shown in Figure 9B, the first DMRS can occupy RE6 and RE7 on time domain symbols 2 and 3, respectively. The second DMRS can occupy RE8 and RE9 on time domain symbols 2 and 3, respectively. The third DMRS can occupy RE10 and RE11 on time domain symbols 2 and 3, respectively.

[0333] The following is a schematic diagram of a communication device according to an embodiment of this application. Referring to FIG13, the communication device can be used to execute the process performed by the terminal device in the embodiments shown in FIG7, FIG10 to FIG12. For details, please refer to the relevant description in the foregoing method embodiments.

[0334] The communication device 1300 includes a transceiver module 1301 and a processing module 1302.

[0335] The processing module 1302 is used for data processing. The transceiver module 1301 can implement the corresponding communication functions. The transceiver module 1301 can also be called a communication interface or a communication module.

[0336] Optionally, the communication device 1300 may further include a storage module, which can be used to store program code, program instructions and / or data. The processing module 1302 can read the instructions and / or data in the storage module so that the communication device 1300 can implement the aforementioned method embodiments.

[0337] The communication device 1300 can be used to perform the actions performed by the terminal device in the embodiments shown in Figures 7, 10 to 12. For example, it can be the terminal device itself, a communication module within the terminal device, or a circuit or chip within the terminal device responsible for communication functions. The communication device 1300 can be the terminal device or a component configurable within the terminal device. The processing module 1302 is used to perform processing-related operations on the terminal device side in the embodiments shown in Figures 7, 10 to 12. The transceiver module 1301 is used to perform receiving-related operations on the terminal device side in the embodiments shown in Figures 7, 10 to 12.

[0338] Optionally, the transceiver module 1301 may include a sending module and a receiving module. The sending module is used to perform the sending operation in the embodiments shown in Figures 7, 10 to 12. The receiving module is used to perform the receiving operation in the embodiments shown in Figures 7, 10 to 12.

[0339] It should be noted that the communication device 1300 may include a transmitting module but not a receiving module. Alternatively, the communication device 1300 may include a receiving module but not a transmitting module. Specifically, it depends on whether the above-described scheme performed by the communication device 1300 includes both transmitting and receiving actions. For example, the communication device 1300 is used to perform the actions performed by the terminal device in the embodiments shown in Figures 7, 10 to 12. For details, please refer to the relevant descriptions in the embodiments shown in Figures 7, 10 to 12; these will not be elaborated upon here.

[0340] For example, the communication device 1300 is used to execute the following scheme:

[0341] The transceiver module 1301 is used to receive first indication information from the network device, the first indication information indicating the adjustment amount for adjusting the frequency domain density of the DMRS;

[0342] Processing module 1302 is used to determine the frequency domain resources occupied by the DMRS based on the type of the DMRS and the first indication information, wherein the type of the DMRS is type 1 or type 2;

[0343] The transceiver module 1301 is also used to receive DMRS from network devices through the frequency domain resources occupied by DMRS.

[0344] In one possible implementation, the frequency domain resources occupied by the DMRS include the resource elements (REs) occupied by the DMRS. When the DMRS is of type 1, the index of the REs occupied by the DMRS is... Alternatively, DMRS uses the RE index. n′ is the index of the symbol in the sequence used to generate DMRS, and the value of n′ ranges from 1 to 2. Y equals the length of the sequence, k′ equals 0 and 1, Δ equals 0 or 1, p is the adjustment amount, p is greater than 0 and less than or equal to 1.

[0345] In another possible implementation, the frequency domain resources occupied by the DMRS include the REs occupied by the DMRS. When the DMRS type is type 2, the index of the REs occupied by the DMRS is... Alternatively, DMRS uses the RE index. n′ is the index of the symbol in the sequence used to generate DMRS, and the value of n′ ranges from 1 to 2. Y equals the length of the sequence minus one, k′ equals 0 and 1, Δ equals 0, 2 or 4, p is the adjustment amount, p is greater than 0 and less than or equal to 1.

[0346] In another possible implementation, the frequency domain resources occupied by the DMRS include the REs used by the DMRS. When the DMRS type is type 1, the index k of the REs used by the DMRS is k = p(4n′) + 2k′ + Δ, or the index k of the REs used by the DMRS is k = p(4n′ + 2k′) + Δ, where n′ is the sequence number of the symbol used to generate the DMRS, and the value of n′ ranges from 0 to 1. Y equals the length of the sequence minus one, k′ equals 0 and 1, Δ equals 0 or 1, p is the adjustment amount, and p is an integer greater than or equal to 1.

[0347] In another possible implementation, the frequency domain resources occupied by the DMRS include the REs used by the DMRS. When the DMRS type is type 2, the index k of the REs occupied by the DMRS is k = p(6n′) + k′ + Δ, or the index k of the REs occupied by the DMRS is k = p(6n′ + k′) + Δ, where n′ is the sequence number of the symbol used to generate the DMRS, and the value of n′ ranges from 0 to 1. Y equals the length of the sequence, k′ equals 0 and 1, Δ equals 0, 2 or 4, p is the adjustment amount, and p is an integer greater than or equal to 1.

[0348] In another possible implementation, the first indication information is carried in the configuration information of the DMRS or in the DCI.

[0349] In another possible implementation, the transceiver module 1301 is further configured to: send capability information to the network device, the capability information indicating at least one of the following: the frequency domain density of the DMRS that the communication device 1300 supports measuring, or the range to which the frequency domain density of the DMRS that the communication device 1300 supports measuring belongs.

[0350] For other methods, please refer to the relevant description of the embodiment shown in Figure 7, which will not be repeated here.

[0351] For example, the communication device 1300 is used to execute the following scheme:

[0352] The transceiver module 1301 is used to receive second indication information from the network device. The second indication information is used to indicate the type of DMRS. The frequency domain density of the DMRS is different from that of type 1 DMRS and different from that of type 2 DMRS.

[0353] Processing module 1302 is used to determine the frequency domain resources occupied by the DMRS according to the type of DMRS;

[0354] The transceiver module 1301 is also used to receive DMRS from network devices through the frequency domain resources occupied by DMRS.

[0355] In one possible implementation, the frequency domain resources occupied by the DMRS include the REs occupied by the DMRS; when the frequency domain density of the DMRS is p times the frequency domain density of a type 1 DMRS, where p is greater than 0 and less than or equal to 1, the index of the REs occupied by the DMRS is... Alternatively, DMRS uses the RE index. n′ is the index of the symbol in the sequence used to generate DMRS, and the value of n′ ranges from 1 to 2. Y equals the length of the sequence minus one, k′ equals 0 and 1, and Δ equals 0 or 1.

[0356] In another possible implementation, the frequency domain resources occupied by the DMRS include the REs occupied by the DMRS; when the frequency domain density corresponding to the type of DMRS is p times the frequency domain density of type 2 DMRS, where p is greater than 0 and less than or equal to 1, the index of the REs occupied by the DMRS is... Alternatively, DMRS uses the RE index. n′ is the index of the symbol in the sequence used to generate DMRS, and the value of n′ ranges from 1 to 2. Y equals the length of the sequence minus one, k′ equals 0 and 1, and Δ equals 0, 2, or 4.

[0357] In another possible implementation, the frequency domain resources occupied by the DMRS include the REs (Resources) occupied by the DMRS; when the frequency domain density corresponding to the type of DMRS is 1 / p times the frequency domain density of type 1 DMRS, where p is an integer greater than or equal to 1, the index k of the REs occupied by the DMRS is k = p(4n′) + 2k′ + Δ, or, the index k of the REs occupied by the DMRS is k = p(4n′ + 2k′) + Δ, where n′ is the sequence number of the symbol used to generate the DMRS, and the value range of n′ is... Y equals the length of the sequence minus one, k′ equals 0 and 1, and Δ equals 0 or 1.

[0358] In another possible implementation, the frequency domain resources occupied by the DMRS include the REs (Resources) occupied by the DMRS; when the frequency domain density corresponding to the type of DMRS is 1 / p times the frequency domain density of type 2 DMRS, where p is an integer greater than or equal to 1, the index k of the REs occupied by the DMRS is k = p(6n′) + k′ + Δ, or, the index k of the REs occupied by the DMRS is k = p(6n′ + k′) + Δ, where n′ is the sequence number of the symbol used to generate the DMRS, and the value range of n′ is... Y equals the length of the sequence minus one, k′ equals 0 and 1, and Δ equals 0, 2, or 4.

[0359] In another possible implementation, the second instruction information is carried in the configuration information of the DMRS or in the DCI.

[0360] In another possible implementation, the transceiver module 1301 is further configured to: send capability information to the network device, the capability information indicating at least one of the following: the frequency domain density of the DMRS that the communication device 1300 supports for measurement, the range to which the frequency domain density of the DMRS that the communication device 1300 supports for measurement, or the type of DMRS that the communication device 1300 supports for measurement.

[0361] For other methods, please refer to the relevant description of the embodiment shown in Figure 10, which will not be repeated here.

[0362] For example, the communication device 1300 is used to execute the following scheme:

[0363] The transceiver module 1301 is used to receive first indication information from the network device, the first indication information indicating the adjustment amount for adjusting the frequency domain density of the DMRS;

[0364] Processing module 1302 is used to determine the frequency domain density of DMRS based on the type of DMRS and the first indication information, wherein the DMRS is either type 1 DMRS or type 2 DMRS;

[0365] The transceiver module 1301 is also configured to receive DMRS from the network device according to the frequency domain density of the DMRS. The pattern corresponding to the frequency domain density of the DMRS includes: the DMRS occupying one or more time domain symbols; when the DMRS is type 1 DMRS, the number of REs occupied by the DMRS on each time domain symbol is less than the number of REs occupied on each time domain symbol in the pattern corresponding to the frequency domain density of type 1 DMRS; when the DMRS is type 2 DMRS, the number of REs occupied by the DMRS on each time domain symbol is less than the number of REs occupied on each time domain symbol in the pattern corresponding to the frequency domain density of type 2 DMRS.

[0366] For other methods, please refer to the relevant description of the embodiment shown in Figure 11, which will not be repeated here.

[0367] For example, the communication device 1300 is used to execute the following scheme:

[0368] Transceiver module 1301 is used to receive second indication information from network device, the second indication information indicating the type of DMRS;

[0369] Processing module 1302 is used to determine the frequency domain density of DMRS according to the type of DMRS;

[0370] The transceiver module 1301 is also configured to receive DMRS from the network device according to the frequency domain density of the DMRS. The pattern corresponding to the frequency domain density of the DMRS includes: the DMRS occupies one or more time domain symbols, the number of resource elements (REs) occupied by the DMRS on each time domain symbol is less than the number of REs occupied on each time domain symbol in the pattern corresponding to the frequency domain density of type 1 DMRS, or the number of REs occupied by the DMRS on each time domain symbol is less than the number of REs occupied on each time domain symbol in the pattern corresponding to the frequency domain density of type 2 DMRS.

[0371] For other methods, please refer to the relevant description of the embodiment shown in Figure 12, which will not be repeated here.

[0372] It should be understood that the specific procedures for each module to perform the above-mentioned corresponding processes have been described in detail in the above method embodiments, and will not be repeated here for the sake of brevity.

[0373] Optionally, when the communication device 1300 is a terminal device or a communication module within a terminal device, the processing module 1302 in the above embodiments can be implemented by at least one processor or processor-related circuitry. Specifically, the processor may include a modem chip, or a system-on-a-chip (SoC) chip containing a modem core, or a system-in-package (SIP) chip. The transceiver module 1301 can be implemented by a transceiver or transceiver-related circuitry. The transceiver module 1301 may also be referred to as a communication module or communication interface. The storage module can be implemented by at least one memory.

[0374] Optionally, when the communication device 1300 is a circuit or chip in a terminal device responsible for communication functions, such as a modem chip or a SoC chip or SIP chip containing a modem core, the function of the processing module 1302 can be implemented by a circuit system in the aforementioned chip that includes one or more processors or processing cores. The function of the transceiver module 1301 can be implemented by the interface circuit or data transceiver circuit on the aforementioned chip.

[0375] The following is another structural schematic diagram of the communication device according to an embodiment of this application. Referring to FIG14, the communication device can be used to execute the process performed by the network device in the embodiments shown in FIG7, FIG10 to FIG12. For details, please refer to the relevant description in the foregoing method embodiments.

[0376] The communication device 1400 includes a transceiver module 1401 and a processing module 1402.

[0377] The processing module 1402 is used for data processing. The transceiver module 1401 can implement the corresponding communication functions. The transceiver module 1401 can also be called a communication interface or a communication module.

[0378] Optionally, the communication device 1400 may further include a storage module, which can be used to store program code, program instructions and / or data. The processing module 1402 can read the instructions and / or data in the storage module so that the communication device 1400 can implement the aforementioned method embodiments.

[0379] In one possible implementation, the communication device 1400 can be used to perform the actions performed by the network device in the above method embodiments. For example, it can be a network device or a communication module within a network device, or a circuit or chip within a network device responsible for communication functions. The communication device 1400 can be a network device or a component configurable within a network device. The processing module 1402 is used to perform processing-related operations on the network device side in the above method embodiments. The transceiver module 1401 is used to perform reception-related operations on the network device side in the above method embodiments.

[0380] Optionally, the transceiver module 1401 may include a sending module and a receiving module. The sending module is used to perform the sending operation in the above method embodiments. The receiving module is used to perform the receiving operation in the above method embodiments.

[0381] It should be noted that the communication device 1400 may include a transmitting module but not a receiving module. Alternatively, the communication device 1400 may include a receiving module but not a transmitting module. Specifically, it depends on whether the above-described scheme executed by the communication device 1400 includes both transmitting and receiving actions.

[0382] For example, the communication device 1400 is used to perform the actions performed by the network device in the embodiments shown in Figures 7, 10 to 12. For details, please refer to the relevant descriptions in the embodiments shown in Figures 7, 10 to 12, which will not be elaborated upon here.

[0383] For example, the communication device 1400 is used to execute the following scheme:

[0384] The transceiver module 1401 is used to send first indication information to the terminal device, the first indication information indicating the adjustment amount for adjusting the frequency domain density of DMRS;

[0385] Processing module 1402 is used to determine the frequency domain resources occupied by the DMRS based on the type of the DMRS and the first indication information, wherein the type of the DMRS is type 1 or type 2;

[0386] The transceiver module 1401 is also used to send DMRS to the terminal device through the frequency domain resources occupied by DMRS.

[0387] In one possible implementation, the frequency domain resources occupied by the DMRS include the resource elements (REs) occupied by the DMRS. When the DMRS is of type 1, the index of the REs occupied by the DMRS is... Alternatively, DMRS uses the RE index. n′ is the index of the symbol in the sequence used to generate DMRS, and the value of n′ ranges from 1 to 2. Y equals the length of the sequence, k′ equals 0 and 1, Δ equals 0 or 1, p is the adjustment amount, p is greater than 0 and less than or equal to 1.

[0388] In another possible implementation, the frequency domain resources occupied by the DMRS include the REs occupied by the DMRS. When the DMRS type is type 2, the index of the REs occupied by the DMRS is... Alternatively, DMRS uses the RE index. n′ is the index of the symbol in the sequence used to generate DMRS, and the value of n′ ranges from 1 to 2. Y equals the length of the sequence minus one, k′ equals 0 and 1, Δ equals 0, 2 or 4, p is the adjustment amount, p is greater than 0 and less than or equal to 1.

[0389] In another possible implementation, the frequency domain resources occupied by the DMRS include the REs used by the DMRS. When the DMRS type is type 1, the index k of the REs used by the DMRS is k = p(4n′) + 2k′ + Δ, or the index k of the REs used by the DMRS is k = p(4n′ + 2k′) + Δ, where n′ is the sequence number of the symbol used to generate the DMRS, and the value of n′ ranges from 0 to 1. Y equals the length of the sequence minus one, k′ equals 0 and 1, Δ equals 0 or 1, p is the adjustment amount, and p is an integer greater than or equal to 1.

[0390] In another possible implementation, the frequency domain resources occupied by the DMRS include the REs used by the DMRS. When the DMRS type is type 2, the index k of the REs occupied by the DMRS is k = p(6n′) + k′ + Δ, or the index k of the REs occupied by the DMRS is k = p(6n′ + k′) + Δ, where n′ is the sequence number of the symbol used to generate the DMRS, and the value of n′ ranges from 0 to 1. Y equals the length of the sequence, k′ equals 0 and 1, Δ equals 0, 2 or 4, p is the adjustment amount, and p is an integer greater than or equal to 1.

[0391] In another possible implementation, the first indication information is carried in the configuration information of the DMRS or in the DCI.

[0392] In another possible implementation, the transceiver module 1401 is further configured to: receive transmission capability information from the terminal device, the capability information being used to indicate at least one of the following: the frequency domain density of the DMRS that the terminal device supports measuring, or the range to which the frequency domain density of the DMRS that the terminal device supports measuring belongs.

[0393] For other implementation methods, please refer to the relevant descriptions in the embodiments shown in Figure 7.

[0394] For example, the communication device 1400 is used to execute the following scheme:

[0395] The transceiver module 1401 is used to send second indication information to the terminal device. The second indication information is used to indicate the type of DMRS. The frequency domain density of the DMRS is different from that of type 1 DMRS and different from that of type 2 DMRS.

[0396] Processing module 1402 is used to determine the frequency domain resources occupied by the DMRS according to the type of DMRS;

[0397] The transceiver module 1401 is also used to send DMRS to the terminal device through the frequency domain resources occupied by DMRS.

[0398] In one possible implementation, the frequency domain resources occupied by the DMRS include the REs occupied by the DMRS; when the frequency domain density of the DMRS is p times the frequency domain density of a type 1 DMRS, where p is greater than 0 and less than or equal to 1, the index of the REs occupied by the DMRS is... Alternatively, DMRS uses the RE index. n′ is the index of the symbol in the sequence used to generate DMRS, and the value of n′ ranges from 1 to 2. Y equals the length of the sequence minus one, k′ equals 0 and 1, and Δ equals 0 or 1.

[0399] In another possible implementation, the frequency domain resources occupied by the DMRS include the REs occupied by the DMRS; when the frequency domain density corresponding to the type of DMRS is p times the frequency domain density of type 2 DMRS, where p is greater than 0 and less than or equal to 1, the index of the REs occupied by the DMRS is... Alternatively, DMRS uses the RE index. n′ is the index of the symbol in the sequence used to generate DMRS, and the value of n′ ranges from 1 to 2. Y equals the length of the sequence minus one, k′ equals 0 and 1, and Δ equals 0, 2, or 4.

[0400] In another possible implementation, the frequency domain resources occupied by the DMRS include the REs (Resources) occupied by the DMRS; when the frequency domain density corresponding to the type of DMRS is 1 / p times the frequency domain density of type 1 DMRS, where p is an integer greater than or equal to 1, the index k of the REs occupied by the DMRS is k = p(4n′) + 2k′ + Δ, or, the index k of the REs occupied by the DMRS is k = p(4n′ + 2k′) + Δ, where n′ is the sequence number of the symbol used to generate the DMRS, and the value range of n′ is... Y equals the length of the sequence minus one, k′ equals 0 and 1, and Δ equals 0 or 1.

[0401] In another possible implementation, the frequency domain resources occupied by the DMRS include the REs (Resources) occupied by the DMRS; when the frequency domain density corresponding to the type of DMRS is 1 / p times the frequency domain density of type 2 DMRS, where p is an integer greater than or equal to 1, the index k of the REs occupied by the DMRS is k = p(6n′) + k′ + Δ, or, the index k of the REs occupied by the DMRS is k = p(6n′ + k′) + Δ, where n′ is the sequence number of the symbol used to generate the DMRS, and the value range of n′ is... Y equals the length of the sequence minus one, k′ equals 0 and 1, and Δ equals 0, 2, or 4.

[0402] In another possible implementation, the second instruction information is carried in the configuration information of the DMRS or in the DCI.

[0403] In another possible implementation, the transceiver module 1401 is further configured to: receive capability information from the terminal device, the capability information indicating at least one of the following: the frequency domain density of the DMRS that the terminal device supports measuring, the range to which the frequency domain density of the DMRS that the terminal device supports measuring belongs, or the type of DMRS that the terminal device supports measuring.

[0404] For other implementation methods, please refer to the relevant descriptions in the embodiments shown in Figure 10.

[0405] For example, the communication device 1400 is used to execute the following scheme:

[0406] The transceiver module 1401 is used to send first indication information to the terminal device, the first indication information indicating the adjustment amount for adjusting the frequency domain density of DMRS;

[0407] Processing module 1402 is used to determine the frequency domain density of DMRS based on the type of DMRS and the first indication information, wherein the DMRS is either type 1 DMRS or type 2 DMRS;

[0408] The transceiver module 1401 is also used to send the DMRS to the terminal device according to the frequency domain density of the DMRS. The pattern corresponding to the frequency domain density of the DMRS includes: the DMRS occupies one or more time domain symbols. When the DMRS is type 1 DMRS, the number of REs occupied by the DMRS on each time domain symbol is less than the number of REs occupied on each time domain symbol in the pattern corresponding to the frequency domain density of type 1 DMRS; when the DMRS is type 2 DMRS, the number of REs occupied by the DMRS on each time domain symbol is less than the number of REs occupied on each time domain symbol in the pattern corresponding to the frequency domain density of type 2 DMRS.

[0409] For other implementation methods, please refer to the relevant descriptions in the embodiments shown in Figure 11.

[0410] For example, the communication device 1400 is used to execute the following scheme:

[0411] The transceiver module 1401 is used to send second indication information to the terminal device, the second indication information indicating the type of DMRS;

[0412] Processing module 1402 is used to determine the frequency domain density of DMRS according to the type of DMRS;

[0413] The transceiver module 1401 is also used to send the DMRS to the terminal device according to the frequency domain density of the DMRS. The pattern corresponding to the frequency domain density of the DMRS includes: the DMRS occupies one or more time domain symbols, the number of REs occupied by the DMRS on each time domain symbol is less than the number of REs occupied on each time domain symbol in the pattern corresponding to the frequency domain density of type 1 DMRS, or the number of REs occupied by the DMRS on each time domain symbol is less than the number of REs occupied on each time domain symbol in the pattern corresponding to the frequency domain density of type 2 DMRS.

[0414] For other implementation methods, please refer to the relevant descriptions in the embodiments shown in Figure 12.

[0415] It should be understood that the specific procedures for each module to perform the above-mentioned corresponding processes have been described in detail in the above method embodiments, and will not be repeated here for the sake of brevity.

[0416] Optionally, the processing module 1402 in the above embodiments can be implemented by at least one processor or processor-related circuitry. The transceiver module 1401 can be implemented by a transceiver or transceiver-related circuitry. The transceiver module 1401 can also be referred to as a communication module or communication interface. The storage module can be implemented by at least one memory.

[0417] This application embodiment also provides a communication device 1500. Referring to FIG15, the communication device 1500 includes a processor 1510, which is coupled to a memory 1520. The memory 1520 is used to store computer programs or instructions and / or data. The processor 1510 is used to execute the computer programs or instructions and / or data stored in the memory 1520, causing the methods in the above method embodiments to be executed. The communication device 1500 is used to implement the operations performed by the terminal device or network device in the above method embodiments.

[0418] Optionally, the communication device 1500 may include one or more processors 1510.

[0419] Optionally, as shown in Figure 15, the communication device 1500 may also include a memory 1520.

[0420] Optionally, the communication device 1500 may include one or more memory 1520.

[0421] Optionally, the memory 1520 can be integrated with the processor 1510 or set separately.

[0422] Optionally, as shown in Figure 15, the communication device 1500 may further include a transceiver 1530 for receiving and / or transmitting signals. For example, a processor 1510 is used to control the transceiver 1530 to receive and / or transmit signals.

[0423] This application also provides a communication device 1600, which can be a terminal device, a processor in the terminal device, or a chip. The communication device 1600 can be used to perform the operations performed by the terminal device in the above method embodiments.

[0424] When the communication device 1600 is a terminal device, Figure 16 shows a simplified structural diagram of the terminal device. As shown in Figure 16, the terminal device includes a processor, a memory, and a transceiver. The memory can store computer program code, and the transceiver includes a transmitter 1631, a receiver 1632, radio frequency circuitry (not shown in the figure), an antenna 1633, and input / output devices (not shown in the figure).

[0425] The processor is mainly used to process communication protocols and communication data; control terminal devices; execute software programs; and process data from software programs.

[0426] Memory is mainly used to store software programs and data.

[0427] Radio frequency (RF) circuits are mainly used for the conversion between baseband signals and RF signals, as well as for the processing of RF signals.

[0428] Antennas are primarily used for transmitting and receiving radio frequency signals in the form of electromagnetic waves.

[0429] Input / output devices can include touchscreens, displays, or keyboards. They are primarily used to receive user input and output data to the user. It should be noted that some types of terminal devices may not have input / output devices.

[0430] When data needs to be transmitted, the processor performs baseband processing on the data to be transmitted and outputs a baseband signal to the radio frequency (RF) circuit. The RF circuit then processes the baseband signal and transmits it outwards via an antenna as electromagnetic waves. When data is sent to the terminal device, the RF circuit receives the RF signal through the antenna. The RF circuit converts the RF signal back into a baseband signal and outputs it to the processor. The processor converts the baseband signal back into data and processes the data. For ease of explanation, Figure 16 only shows one memory, processor, and transceiver. In actual terminal device products, there may be one or more processors and one or more memories. Memory can also be called storage medium or storage device, etc. Memory can be independent of the processor or integrated with the processor; this embodiment does not limit this.

[0431] In this embodiment, the antenna and radio frequency circuit with transceiver function can be regarded as the transceiver module of the terminal device, and the processor with processing function can be regarded as the processing module of the terminal device.

[0432] As shown in Figure 16, the terminal device includes a processor 1610, a memory 1620, and a transceiver 1630. The processor 1610 can also be referred to as a processing unit, processing board, processing module, or processing device, etc. The transceiver 1630 can also be referred to as a transceiver unit, transceiver, or transceiver device, etc.

[0433] Optionally, the device in transceiver 1630 used to implement the receiving function can be considered a receiving module, and the device in transceiver 1630 used to implement the transmitting function can be considered a transmitting module. That is, transceiver 1630 includes a receiver and a transmitter. A transceiver may also be called a transceiver unit, transceiver module, or transceiver circuit, etc. A receiver may also be called a receiver unit, receiving module, or receiving circuit, etc. A transmitter may also be called a transmitter, transmitting module, or transmitting circuit, etc.

[0434] The processor 1610 is used to execute the processing actions on the terminal device side in the embodiments shown in Figures 7, 10 to 12. The transceiver 1630 is used to execute the transmission and reception actions on the terminal device side in the embodiments shown in Figures 7, 10 to 12.

[0435] It should be understood that Figure 16 is merely an example and not a limitation, and the terminal device described above, including the transceiver module and the processing module, may not depend on the structure shown in Figure 13 or Figure 16.

[0436] When the communication device 1600 is a chip, the chip includes a processor, a memory, and a transceiver. The transceiver can be an input / output circuit or a communication interface. The processor can be a processing module integrated on the chip, a microprocessor, or an integrated circuit. In the above method embodiments, the sending operation of the terminal device can be understood as the output of the chip, and the receiving operation of the terminal device in the above method embodiments can be understood as the input of the chip.

[0437] This application also provides a communication device 1700, which can be a network device or a chip. The communication device 1700 can be used to perform the operations performed by the network device in the embodiments shown in Figures 7, 10 to 12.

[0438] When the communication device 1700 is a network device, such as a base station, Figure 17 shows a simplified schematic diagram of a base station structure. The base station includes parts 1710, 1720, and 1730.

[0439] The 1710 section is mainly used for baseband processing and controlling the base station; the 1710 section is usually the control center of the base station, which can be called the processor, and is used to control the base station to perform the processing operations on the network device side in the above method embodiments.

[0440] Part 1720 is primarily used to store computer program code and data.

[0441] Section 1730 is primarily used for transmitting and receiving radio frequency (RF) signals, as well as converting RF signals to baseband signals. Section 1730 is commonly referred to as a transceiver module, transceiver, transceiver circuit, or transceiver unit. The transceiver module of section 1730, also known as a transceiver or transceiver unit, includes antenna 1733 and RF circuitry (not shown in the figure), where the RF circuitry is mainly used for RF processing. Optionally, the device in section 1730 used for receiving can be considered a receiver, and the device used for transmitting can be considered a transmitter; that is, section 1730 includes receiver 1732 and transmitter 1731. The receiver can also be called a receiving module, receiver circuit, or receiving circuit, and the transmitter can be called a transmitting module, transmitter, or transmitting circuit.

[0442] Sections 1710 and 1720 may include one or more circuit boards, each of which may include one or more processors and one or more memories. The processors are used to read and execute programs from the memories to implement baseband processing functions and control the base station. If multiple circuit boards exist, they can be interconnected to enhance processing capabilities. As an alternative implementation, multiple circuit boards may share one or more processors, multiple circuit boards may share one or more memories, or multiple circuit boards may simultaneously share one or more processors.

[0443] For example, in one implementation, the transceiver module of section 1730 is used to execute the transceiver-related processes performed by the network device in the embodiments shown in Figures 7, 10 to 12. The processor of section 1710 is used to execute the processing-related processes performed by the network device in the embodiments shown in Figures 7, 10 to 12.

[0444] It should be understood that Figure 17 is merely an example and not a limitation, and the network devices described above, including processors, memory, and transceivers, may not depend on the structures shown in Figure 14 or Figure 17.

[0445] When the communication device 1700 is a chip, the chip includes a transceiver, a memory, and a processor. The transceiver can be an input / output circuit or a communication interface; the processor can be a processor integrated on the chip, a microprocessor, or an integrated circuit. In the above method embodiments, the transmitting operation of the network device can be understood as the chip's output, and the receiving operation of the network device in the above method embodiments can be understood as the chip's input.

[0446] This application also provides a computer-readable storage medium having stored thereon computer instructions for implementing the methods executed by a terminal device or a network device in the above method embodiments.

[0447] For example, when the computer program is executed by a computer, it enables the computer to implement the method executed by the terminal device or network device in the above method embodiments.

[0448] This application also provides a computer program product containing instructions that, when executed by a computer, cause the computer to perform the method described in the above method embodiments, which is executed by a terminal device or a network device.

[0449] This application also provides a communication system, which includes a terminal device and a network device. The terminal device is used to perform some or all of the operations performed by the terminal device in the embodiments shown in Figures 7, 10 to 12 above, and the network device is used to perform some or all of the operations performed by the network device in the embodiments shown in Figures 7, 10 to 12 above.

[0450] This application also provides a chip device, including a processor, for calling computer programs or computer instructions stored in the memory, so that the processor executes the method provided in the embodiments shown in Figures 7, 10 to 12 above.

[0451] In one possible implementation, the input of the chip device corresponds to the receiving operation in any one of the embodiments shown in Figures 7, 10 to 12, and the output of the chip device corresponds to the sending operation in any one of the embodiments shown in Figures 7, 10 to 12.

[0452] Optionally, the processor is coupled to the memory via an interface.

[0453] Optionally, the chip device may also include a memory that stores computer programs or computer instructions.

[0454] The processor mentioned above can be a general-purpose central processing unit, a microprocessor, an application-specific integrated circuit (ASIC), or one or more integrated circuits used to control the execution of a program for controlling the method provided in any of the embodiments shown in Figures 7, 10 to 12. The memory mentioned above can be read-only memory (ROM) or other types of static storage devices capable of storing static information and instructions, such as random access memory (RAM).

[0455] Those skilled in the art will clearly understand that, for the sake of convenience and brevity, the explanations and beneficial effects of the relevant contents in any of the above-mentioned devices can be referred to the corresponding method embodiments provided above, and will not be repeated here.

[0456] In the several embodiments provided in this application, it should be understood that the disclosed systems, apparatuses, and methods can be implemented in other ways. For example, the apparatus embodiments described above are merely illustrative; for instance, the division of units is only a logical functional division, and in actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the coupling or direct coupling or communication connection shown or discussed may be an indirect coupling or communication connection between apparatuses or units through some interfaces, and may be electrical, mechanical, or other forms.

[0457] The units described as separate components may or may not be physically separate. 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 the units can be selected to achieve the purpose of this embodiment according to actual needs.

[0458] Furthermore, the functional units in the various embodiments of this application can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. The integrated unit can be implemented in hardware or as a software functional unit.

[0459] If the integrated unit is implemented as a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the essential contribution of the technical solution of this application, or all or part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of this application. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, ROM, RAM, magnetic disks, or optical disks.

[0460] The above-described embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit it. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. A method for receiving a demodulated reference signal (DMRS), characterized in that, The method includes: Receive first indication information from the network device, the first indication information indicating the adjustment amount for adjusting the frequency domain density of the DMRS; The frequency domain resources occupied by the DMRS are determined according to the type of the DMRS and the first indication information, wherein the type of the DMRS is type 1 or type 2; The DMRS is received from the network device using the frequency domain resources occupied by the DMRS.

2. A method for transmitting a demodulation reference signal (DMRS), characterized in that, The method includes: Send a first indication message to the terminal device, the first indication message indicating the adjustment amount for adjusting the frequency domain density of the DMRS; The frequency domain resources occupied by the DMRS are determined according to the type of the DMRS and the first indication information, wherein the type of the DMRS is type 1 or type 2; The DMRS is transmitted to the terminal device using the frequency domain resources occupied by the DMRS.

3. The method according to claim 1 or 2, characterized in that, The adjustment amount is used to decrease or increase the frequency domain density of the DMRS.

4. The method according to claim 1 or 2, characterized in that, The first indication information specifically indicates the sparsity of the frequency domain density of the DMRS.

5. The method according to any one of claims 1 to 4, characterized in that, The frequency domain resources occupied by the DMRS include the resource units (REs) occupied by the DMRS. When the type of the DMRS is type 1, the index of the REs occupied by the DMRS is... Alternatively, the index of the RE occupied by the DMRS The n′ is the sequence number of the symbol used to generate the DMRS, and the value of n′ ranges from 1 to 2. Y is equal to the length of the sequence minus one, k′ is equal to 0 and 1, Δ is equal to 0 or 1, p is the adjustment amount, and p is greater than 0 and less than or equal to 1; or... The frequency domain resources occupied by the DMRS include the REs occupied by the DMRS. When the DMRS is of type 1, the index k of the REs occupied by the DMRS is p(4n′) + 2k′ + Δ, or the index k of the REs occupied by the DMRS is p(4n′ + 2k′) + Δ, where n′ is the sequence number of the symbol used to generate the DMRS, and the value range of n′ is... Y is equal to the length of the sequence minus one, k′ is equal to 0 and 1, Δ is equal to 0 or 1, p is the adjustment amount, and p is an integer greater than or equal to 1.

6. The method according to any one of claims 1 to 4, characterized in that, The frequency domain resources occupied by the DMRS include the REs occupied by the DMRS. When the type of the DMRS is type 2, the index of the REs occupied by the DMRS is... Alternatively, the index of the RE occupied by the DMRS The n′ is the sequence number of the symbol used to generate the DMRS, and the value of n′ ranges from 1 to 2. Y is equal to the length of the sequence minus one, k′ is equal to 0 and 1, Δ is equal to 0, 2 or 4, p is the adjustment amount, and p is greater than 0 and less than or equal to 1; or... The frequency domain resources occupied by the DMRS include the REs occupied by the DMRS. When the DMRS is of type 2, the index k of the REs occupied by the DMRS is p(6n′) + k′ + Δ, or the index k of the REs occupied by the DMRS is p(6n′ + k′) + Δ, where n′ is the sequence number of the symbol used to generate the DMRS, and the value range of n′ is... Y is equal to the length of the sequence minus one, k′ is equal to 0 and 1, Δ is equal to 0, 2 or 4, p is the adjustment amount, and p is an integer greater than or equal to 1.

7. The method according to any one of claims 1 to 6, characterized in that, The first indication information is carried in the configuration information of the DMRS, or in the downlink control information (DCI).

8. The method according to any one of claims 1, 3 to 7, characterized in that, The method further includes: The terminal device sends capability information to the network device, the capability information indicating at least one of the following: the frequency domain density of the DMRS that the terminal device supports measuring, or the range to which the frequency domain density of the DMRS that the terminal device supports measuring belongs.

9. The method according to any one of claims 2 to 7, characterized in that, The method further includes: The terminal device receives capability information, which includes at least one of the following: the frequency domain density of the DMRS that the terminal device supports measuring, or the range to which the frequency domain density of the DMRS that the terminal device supports measuring belongs.

10. A method for receiving a demodulation reference signal (DMRS), characterized in that, The method includes: Receive second indication information from the network device, the second indication information being used to indicate the type of DMRS, the frequency domain density of the DMRS being different from the frequency domain density of type 1 DMRS, and the frequency domain density of the DMRS being different from the frequency domain density of type 2 DMRS; The frequency domain resources occupied by the DMRS are determined according to the type of the DMRS; The DMRS is received from the network device using the frequency domain resources occupied by the DMRS.

11. A method for transmitting a demodulation reference signal (DMRS), characterized in that, The method includes: Send a second indication message to the terminal device. The second indication message is used to indicate the type of DMRS. The frequency domain density of the DMRS is different from that of type 1 DMRS and the frequency domain density of the DMRS is different from that of type 2 DMRS. The frequency domain resources occupied by the DMRS are determined according to the type of the DMRS; The DMRS is transmitted to the terminal device using the frequency domain resources occupied by the DMRS.

12. The method according to claim 10 or 11, characterized in that, The frequency domain resources occupied by the DMRS include the resource units (REs) occupied by the DMRS. When the frequency domain density of the DMRS is p times the frequency domain density of the type 1 DMRS, where p is greater than 0 and less than or equal to 1, the index of the REs occupied by the DMRS is... Alternatively, the index of the RE occupied by the DMRS Δ, where n′ is the sequence number of the symbol used to generate the DMRS, and the value range of n′ is... The Y is equal to the length of the sequence minus one, the k′ is equal to 0 and 1, and the Δ is equal to 0 or 1; or... The frequency domain resources occupied by the DMRS include the REs occupied by the DMRS. When the frequency domain density of the DMRS is 1 / p times the frequency domain density of the Type 1 DMRS, where p is an integer greater than or equal to 1, the index k of the REs occupied by the DMRS is k = p(4n′) + 2k′ + Δ, or the index k of the REs occupied by the DMRS is k = p(4n′ + 2k′) + Δ, where n′ is the sequence number of the symbol used to generate the DMRS, and the value range of n′ is... The Y is equal to the length of the sequence minus one, the k′ is equal to 0 and 1, and the Δ is equal to 0 or 1.

13. The method according to claim 10 or 11, characterized in that, The frequency domain resources occupied by the DMRS include the REs occupied by the DMRS. When the frequency domain density corresponding to the type of the DMRS is p times the frequency domain density of the type 2 DMRS, where p is greater than 0 and less than or equal to 1, the index of the REs occupied by the DMRS is... Alternatively, the index of the RE occupied by the DMRS The n′ is the sequence number of the symbol used to generate the DMRS, and the value of n′ ranges from 1 to 2. The Y is equal to the length of the sequence minus one, the k′ is equal to 0 and 1, and the Δ is equal to 0, 2, or 4; or, The frequency domain resources occupied by the DMRS include the REs occupied by the DMRS. When the frequency domain density of the DMRS is 1 / p times the frequency domain density of the type 2 DMRS, where p is an integer greater than or equal to 1, the index k of the REs occupied by the DMRS is p(6n′) + k′ + Δ, or the index k of the REs occupied by the DMRS is p(6n′ + k′) + Δ, where n′ is the sequence number of the symbol used to generate the DMRS, and the value range of n′ is... The Y is equal to the length of the sequence minus one, the k′ is equal to 0 and 1, and the Δ is equal to 0, 2, or 4.

14. The method according to any one of claims 10 to 13, characterized in that, The second indication information is carried in the configuration information of the DMRS, or in the downlink control information (DCI).

15. The method according to any one of claims 10, 12 to 14, characterized in that, The method further includes: Send capability information to the network device, the capability information indicating at least one of the following: the frequency domain density of the DMRS that the terminal device supports measuring, the range to which the frequency domain density of the DMRS that the terminal device supports measuring belongs, or the type of DMRS that the terminal device supports measuring.

16. The method according to any one of claims 12 to 14, characterized in that, The method further includes: The terminal device receives capability information, which includes at least one of the following: the frequency domain density of the DMRS that the terminal device supports measuring, the range to which the frequency domain density of the DMRS that the terminal device supports measuring belongs, or the type of DMRS that the terminal device supports measuring.

17. A communication device, characterized in that, The communication device includes a transceiver module and a processing module; The transceiver module is used to perform the transceiver operation of the method as described in any one of claims 1, 3 to 8, and the processing module is used to perform the processing operation of the method as described in any one of claims 1, 3 to 8; or, The transceiver module is used to perform the transceiver operation of the method as described in any one of claims 2 to 7 and 9, and the processing module is used to perform the processing operation of the method as described in any one of claims 2 to 7 and 9; or, The transceiver module is used to perform the transceiver operation of the method as described in any one of claims 10, 12 to 15, and the processing module is used to perform the processing operation of the method as described in any one of claims 10, 12 to 15; or, The transceiver module is used to perform the transceiver operation of the method as described in any one of claims 11 to 14 and 16, and the processing module is used to perform the processing operation of the method as described in any one of claims 11 to 14 and 16.

18. A communication device, characterized in that, The communication device includes a processor for executing a computer program or computer instructions stored in a memory to perform the method as described in any one of claims 1 to 16.

19. A computer-readable storage medium, characterized in that, It stores a computer program thereon, which, when executed by a communication device, causes the communication device to perform the method as described in any one of claims 1 to 16.

20. A computer program product, characterized in that, When the computer program product is run on a computer, the computer performs the method as described in any one of claims 1 to 16.

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