Communication method and apparatus

Abstract

The present application provides a communication method and apparatus. The method comprises: receiving indication information from a second communication apparatus, the indication information being used for indicating at least one first resource set, wherein the first resource set is used for the first communication apparatus to perform interference measurement, the first resource set belongs to a time-frequency resource for data stream mapping, and the data stream corresponds to the first reference signal; determining a power scaling factor of the first reference signal, wherein the power scaling factor is used for sending the first reference signal. In the present technical solution, the second communication apparatus indicates, by means of the indication information, at least one first resource set included in the time-frequency resource for data stream mapping and used for performing interference measurement on a receiving end. The first communication apparatus determines the power scaling factor of the reference signal corresponding to the data stream, so that the receiving end can, according to the power scaling factor of the reference signal, send the reference signal and detect the data stream, thereby ensuring the detection performance of the receiving end on the data stream.

Description

Communication method and device

[0001] This application claims priority to the Chinese patent application filed with the State Intellectual Property Office of China on September 28, 2023, with application number 202311294532.6 and invention name “Communication Method and Device”, the entire contents of which are incorporated by reference into this application. Technical Field

[0002] The present application relates to the field of communications, and more exemplarily, to a communication method and apparatus. Background Art

[0003] Currently, data channel detection is primarily performed by the receiver using reference signals to perform interference estimation, with the resulting interference estimation used to detect and demodulate data. Reference signals, such as the demodulation reference signal (DMRS), are used to estimate the equivalent channel matrix and interference channel experienced by data channels (e.g., the physical downlink shared channel (PDSCH)) or control channels (e.g., the physical downlink control channel (PDCCH)), thereby enabling the receiver to detect and demodulate data.

[0004] When the data channel performs multiple-input multiple-output (MIMO) system detection at the receiving end, the interference estimation mainly depends on the reference signal. Interference estimation can include intra-cell interference estimation and / or inter-cell interference estimation. The accuracy of the reference signal interference estimation depends on whether the time-frequency resources allocated for data or the time-frequency resources allocated for reference signals are aligned between different user equipment in the same cell or between different cells. Since it is difficult to align the time-frequency resources allocated for data and the time-frequency resources allocated for reference signals, it is impossible to obtain a more accurate interference estimate, and thus it is impossible to guarantee the detection performance of the data stream at the receiving end.

[0005] Therefore, how to improve the detection performance of data streams at the receiving end is a current research hotspot.

[0006] Summary of the Invention

[0007] The present application provides a communication method and apparatus that can improve the detection performance of a receiving end for a data stream.

[0008] In a first aspect, a communication method is provided. The method may be executed by a first communication device, or may be executed by a chip or circuit for the first communication device, which is not limited in this application. For ease of description, the following description is based on an example of execution by the first communication device.

[0009] The method includes:

[0010] Receive indication information from a second communication device, the indication information is used to indicate at least one first resource set, the first resource set is used by the first communication device to perform interference measurement, the first resource set belongs to the time-frequency resources mapped by the data stream, and the data stream corresponds to the first reference signal; determine the power scaling factor of the first reference signal, and the power scaling factor is used to send the first reference signal.

[0011] It should be understood that the first resource set includes at least one resource unit (e.g., a first resource), and the first resource can be understood as a time-frequency resource unit within the time-frequency resource range mapped by the data stream that is not used to send the data stream; or the first resource can be understood as a unit in which the transmission power of the data stream on one or more resource units within the time-frequency resource range mapped by the data stream is zero, called a first resource; or, the first resource can be called a zero-power interference measurement resource. At least one first resource in the at least one first resource set is used for interference measurement by the first communication device. The at least one first resource set can be called at least one zero-power interference measurement resource set, or can be called at least one candidate time-frequency resource set for zero-power interference measurement resource mapping, etc., and this application does not limit this.

[0012] It should also be understood that the first resource set is used by the first communication device to perform interference measurement, which can be understood as: the first communication device performs interference estimation using the resources corresponding to the first resource set to obtain an interference estimation result. The interference estimation result may include an inter-cell interference estimation result and / or an intra-cell interference estimation result. The interference estimation result may be expressed in the form of an interference channel matrix, an interference covariance matrix, or interference power, etc.

[0013] It should also be understood that the time-frequency resources mapped to the data stream include the at least one first resource set, and the at least one first resource set is within the range of the time-frequency resources scheduled by the data stream.

[0014] It should also be understood that the data stream in this application can be uplink data or downlink data. The data stream can be data carried by an uplink data channel (e.g., PUSCH) or data carried by a downlink data channel (e.g., PDSCH). The data can be multiple data streams. The data stream in this application can also be referred to as a data layer, a spatial layer, or a spatial data stream.

[0015] According to the method provided in the present application, a first communication device receives indication information from a second communication device, and the indication information is used to indicate at least one first resource set, and the resources in the at least one first resource set are resources in the time-frequency resources mapped by the data stream that are not used to transmit the data stream. It can be seen that the resources in the at least one first resource set are not used to transmit the data stream, that is, the receiving end can obtain the real interference measurement result based on the resources in the at least one first resource set. Among them, the data stream corresponds to the first reference signal, and the first communication device determines the power scaling factor of the first reference signal, and the power scaling factor is used by the receiving end to detect the data stream. In the case that there are resources in the time-frequency resources mapped by the data stream that are not used to transmit the data stream, the first communication device detects the data stream according to the power scaling factor of the reference signal corresponding to the data stream, thereby improving the detection performance of the data stream at the receiving end.

[0016] Exemplarily, the first communication device can be a terminal device, or a chip (or chip system) or circuit of the terminal device, and the second communication device can be a network device, or a chip (or chip system) or circuit of the network device. This application does not limit this.

[0017] In combination with the first aspect, in some possible implementations, the power scaling factor is related to the power EPRE of each resource unit corresponding to the first reference signal and the power EPRE of each resource unit corresponding to the data stream.

[0018] Exemplarily, the EPRE of the first reference signal may be the EPRE of a demodulation reference signal, or the EPRE of the first reference signal may be the EPRE of a phase tracking signal.

[0019] It should be understood that the power scaling factor is related to the EPRE corresponding to the first reference signal and the EPRE corresponding to the data stream, wherein the EPRE corresponding to the data stream can be the power of each resource unit corresponding to a certain time unit (e.g., time unit #1) within the time-frequency resource mapped by the data stream. The time unit #1 can be one or more time domain resource units in the time domain resource mapped by the data, for example, the time unit #1 can refer to one or more symbols, time slots, or mini-time slots, etc. When the time unit #1 is used to indicate multiple time domain resource units, the multiple time domain resource units can be continuous or discontinuous, which is not limited in this application.

[0020] In combination with the first aspect, in some possible implementation methods, when the first reference signal is DMRS, determining the power scaling factor of the first reference signal includes: the power scaling factor is related to the ratio of the EPRE of the data stream to the EPRE of the DMRS, and the power scaling factor is the power scaling factor of the DMRS, wherein the ratio of the EPRE of the data stream to the EPRE of the DMRS is related to a first value and a second value, the first value is the number of frequency domain resources included in the first time unit by the first resource set and the ratio of the number of frequency domain resources included in the first time unit by the time-frequency resources mapped to the data stream, the first resource set is a resource set within a first bandwidth, the time-frequency resources mapped to the data stream are time-frequency resources within the first bandwidth, the time-frequency resources mapped to the data stream include at least one of the first resource set and the second resource set, the second resource set is the time-frequency resources mapped to the data stream for transmitting the data stream, and the second value is the number of DMRS code division multiplexing (CDM) groups that do not map the data stream.

[0021] Optionally, the first value may also be the ratio of the sum of the number of frequency domain resources included in each time domain resource included in the first resource set in the first time unit to the sum of the number of frequency domain resources included in each time domain resource of the time-frequency resources mapped to the data stream in the first time unit. The first value in the embodiment of the present application may also be the ratio of the average number of frequency domain resources included in each time domain resource of the first resource set in the first time unit to the number of frequency domain resources included in the time-frequency resources mapped to the data stream in the first time unit. The first value in the embodiment of the present application may also be the ratio of the sum of the number of first resources included in the first time unit to the sum of the number of time-frequency resources included in the time-frequency resources mapped to the data stream in the first time unit. The first value in the embodiment of the present application may also be the ratio of the average number of first resources included in each time domain resource of the first resource set in the first time unit to the number of frequency domain resources included in the time-frequency resources mapped to the data stream in the first time unit. The first resource set is a resource set within a first bandwidth, and the time-frequency resources mapped to the data stream are time-frequency resources within the first bandwidth.

[0022] It should be understood that the DMRS power scaling factor is related to the ratio of the EPRE of the data stream to the EPRE of the DMRS. For example, the power scaling factor of the DMRS is determined based on the ratio of the EPRE of the data stream to the EPRE of the DMRS. The power scaling factor of the DMRS can be: the ratio of the EPRE of the data stream to the EPRE of the DMRS, or the power scaling factor of the DMRS can be: the ratio of the EPRE of the DMRS to the EPRE of the data stream. The calculation rules of the specific DMRS power scaling factor are not specifically limited in this application.

[0023] It should also be understood that the first value can also be referred to as the frequency domain density of the zero-power interference measurement resource. For example, the first value can be expressed as a / b, where a is the number of frequency domain resources included in the first resource set in the first time unit, and b is the number of frequency domain resources included in the time-frequency resources mapped to the data stream in the first time unit. The first resource set and the time-frequency resources mapped to the data stream are within the same scheduling bandwidth (e.g., the first bandwidth).

[0024] Among them, the first bandwidth can be a frequency domain subband or a frequency domain unit set composed of one or more frequency domain units. For example, the first bandwidth can be a preset frequency domain length, such as 4 resource blocks (RBs) or 8 RBs. Alternatively, the first bandwidth can be a frequency domain length pre-configured by the system, or configured by a network device, which is not limited in this application. The first bandwidth can also be the scheduling bandwidth of a data channel (such as PUSCH, PDSCH). Among them, the frequency domain unit of the first bandwidth is expressed in the form of a resource block group (RBG) or a precoding resource block group (PRG).

[0025] In addition, the first bandwidth may also be the scheduling bandwidth of the data channel PDSCH or PUSCH.

[0026] Based on the above technical solution, the power scaling factor of DMRS is determined according to the ratio of the EPRE of the data stream to the EPRE of DMRS, wherein the ratio of the EPRE of the data stream to the EPRE of DMRS is related to the first value and the second value, that is, the calculation of the power scaling factor of DMRS is related to the frequency domain density of the zero-power interference measurement resource, thereby ensuring the performance of the receiving end in detecting the data stream when there are resources that are not used to transmit the data stream in the time-frequency resources mapped by the data stream.

[0027] With reference to the first aspect, in some possible implementations, a ratio of an EPRE of the data stream to an EPRE of the DMRS satisfies:

[0028] or,

[0029] Here, ρ represents the first value, and γ represents the second value.

[0030] In conjunction with the first aspect, in some possible implementations,

[0031] When the ratio of the EPRE of the data stream to the EPRE of the DMRS satisfies: When , the power scaling factor of the DMRS satisfies:

[0032] When the ratio of the EPRE of the data stream to the EPRE of the DMRS satisfies: When , the power scaling factor of the DMRS satisfies:

[0033] In combination with the first aspect, in some possible implementation methods, when the first reference signal is PTRS, determining the power scaling factor of the first reference signal includes: the power scaling factor is related to the ratio of the EPRE of the PTRS to the EPRE of the data stream, and the power scaling factor is the power scaling factor of the PTRS, wherein the ratio of the EPRE of the PTRS to the EPRE of the data stream is related to a first value and a third value, the first value is the ratio of the number of frequency domain resources included in the first time unit by the first resource set and the number of frequency domain resources included in the time-frequency resources mapped by the data stream in the first time unit, the first resource set is a resource set within a first bandwidth, the time-frequency resources mapped by the data stream are time-frequency resources within the first bandwidth, the time-frequency resources mapped by the data stream include at least one of the first resource set and a second resource set, the second resource set is the time-frequency resources mapped by the data stream for transmitting the data stream, and the third value is the number of layers of the data stream.

[0034] For example, the power scaling factor of the PTRS is determined based on the ratio of the EPRE of the PTRS to the EPRE of the data stream, wherein the power scaling factor of the PTRS may be: the ratio of the EPRE of the data stream to the EPRE of the PTRS, or the power scaling factor of the PTRS may be: the ratio of the EPRE of the PTRS to the EPRE of the data stream. The calculation rules of the specific PTRS power scaling factor are not specifically limited in this application.

[0035] It should be understood that the third value is the number of layers of the data stream, or the third value is the number of layers of the data stream corresponding to the PTRS. The number of layers of the data stream can be called the number of streams, or spatial layer data, etc.

[0036] Based on the above technical solution, the power scaling factor of PTRS is determined according to the ratio of EPRE of PTRS to EPRE of data stream, wherein the ratio of EPRE of PTRS to EPRE of data stream is related to the first value and the third value, that is, the calculation of the power scaling factor of PTRS is related to the frequency domain density of zero-power interference measurement resources, thereby ensuring the performance of the receiving end in detecting the data stream when there are resources in the time-frequency resources mapped by the data stream that are not used to transmit the data stream.

[0037] In conjunction with the first aspect, in some possible implementations, a ratio of the EPRE of the PTRS to the EPRE of the data stream satisfies:

[0038] β PTRS =(1-ρ)L, or, β PTRS =10log 10 (1-ρ)L

[0039] Here, ρ represents the first value, and L represents the third value.

[0040] In conjunction with the first aspect, in some possible implementations,

[0041] When the ratio of the EPRE of the PTRS to the EPRE of the data stream satisfies: β PTRS =(1-ρ)L, the power scaling factor of the PTRS satisfies:

[0042] When the ratio of the EPRE of the PTRS to the EPRE of the data stream satisfies: β PTRS =10log 10 (1-ρ)L, the power scaling factor of the PTRS satisfies:

[0043] In combination with the first aspect, in some possible implementation methods, at least one of the first resource sets includes M third resource sets in the second time unit, each of the M third resource sets includes m third resources, the time domain resources of the m third resources are the second time unit, and the m third resources correspond one-to-one to the ports of m reference signals, or the m third resources correspond one-to-one to m first indexes, where M and m are both integers greater than or equal to 1.

[0044] It should be understood that the m third resources correspond one-to-one to the ports of the m reference signals, or it can be understood that the m third resources correspond one-to-one to the port indexes of the m reference signals. The m reference signals are any reference signals. For example, the reference signal is a DMRS, and the m reference signal ports are the m DMRS ports that can be supported by the DMRS.

[0045] It should also be understood that the values ​​of M and m can be equal. The value of M is not limited in this application.

[0046] Based on the above technical solution, the at least one first resource set includes M third resource sets on the same time domain resource (for example, the second time unit), and each resource set in the M third resource sets includes m third resources. The m third resources belong to the resources within the at least one first resource set, wherein the time domain resource of the m third resources is the second time unit. The third resources correspond one-to-one with the ports of the m reference signals, that is, a communication device associated with a reference signal port no longer transmits a data stream on a third resource corresponding to the reference signal port; or, the m third resources correspond one-to-one with the m first indexes, that is, a communication device associated with the first index no longer transmits a data stream on the third resource corresponding to the first index.

[0047] In combination with the first aspect, in some possible implementation methods, the indication information is also used to indicate a first port, or a second index, the m reference signal ports include a first port, and the m first indexes include a second index, wherein the at least one first resource set includes at least one first resource, and the first resource is determined based on m third resources and the first port, or the first resource is determined based on m third resources and the second index.

[0048] The first port includes at least one reference signal port. The first resource is a third resource corresponding to reference signal port #1 among the m third resources, where reference signal port #1 is one of the first ports. Alternatively, the first resource is a third resource corresponding to the second index among the m third resources. It should be understood that the relationship between the first resource and reference signal port #1 or the third resource corresponding to the second index, and the relationship between the first resource and the third resource, can be understood as resources occupying the same time-frequency resources.

[0049] It should be understood that the first port includes one or more reference signal ports, and the index of the first port includes one or more reference signal port indexes.

[0050] It should be understood that the information used by the second communication device to indicate the first port or the second index can also be carried in other information and sent to the first communication device, or carried in the same information (such as indication information) as indicating at least one first resource set and sent to the first communication device.

[0051] It should also be understood that the indication information is used to indicate the first port (or the index of the first port), and the first communication device determines the first resource from the m third resources based on the first port and the first rule. Alternatively, the indication information is used to indicate the second index, and the first communication device determines the first resource from the m third resources based on the second index and the first rule. The first rule may be predefined by the system or configured by the second communication device for the first communication device.

[0052] For example, the first communications device selects, based on the first port and the first rule, a third resource corresponding to a reference signal port / port index (e.g., the minimum or maximum port index / reference signal port) in the first port, and determines the third resource as the first resource. For another example, the first communications device selects, based on the first port, a third resource corresponding to the maximum or minimum reference signal port / port index in the first port, and determines the third resource as the first resource.

[0053] It should also be understood that the m third resources are candidate resources for interference measurement. For example, the first communication device can select one or more third resources from the m third resources as first resources according to a predefined rule or certain indication information, and the first resources are resources determined to be used for interference measurement.

[0054] In combination with the first aspect, in some possible implementations, when the reference signal is DMRS, the value of m is related to the type of DMRS, or m is the maximum value of a multi-user multiple-input multiple-output communication device supported by the second communication device.

[0055] In combination with the first aspect, in some possible implementation methods, when the first reference signal is DMRS, determining the power scaling factor of the first reference signal includes: the power scaling factor is related to the ratio of the EPRE of the data stream to the EPRE of the DMRS, and the power scaling factor is the power scaling factor of the DMRS, wherein the ratio of the EPRE of the data stream to the EPRE of the DMRS is related to a fourth value and a second value, the M third resource sets are time-frequency resources within the second bandwidth, the fourth value is the total number of frequency domain resources (e.g., subcarriers) included in the time-frequency resource unit mapped to the data stream within the second bandwidth, and the second value is the number of DMRS code division multiplexing CDM groups that do not map the data stream.

[0056] It should be understood that the DMRS power scaling factor is related to the ratio of the EPRE of the data stream to the EPRE of the DMRS. For example, the power scaling factor of the DMRS is determined based on the ratio of the EPRE of the data stream to the EPRE of the DMRS, wherein the power scaling factor of the DMRS can be: the ratio of the EPRE of the data stream to the EPRE of the DMRS, or the power scaling factor of the DMRS can be: the ratio of the EPRE of the DMRS to the EPRE of the data stream. The calculation rules of the specific DMRS power scaling factor are not specifically limited in this application.

[0057] It should also be understood that the second bandwidth is similar to the first bandwidth described above, wherein the second bandwidth and the first bandwidth may be the same or different.

[0058] Based on the above technical solution, the power scaling factor of DMRS is determined according to the ratio of the EPRE of the data stream to the EPRE of DMRS, wherein the ratio of the EPRE of the data stream to the EPRE of DMRS is related to the fourth value and the second value, that is, the calculation of the power scaling factor of DMRS is related to the total number of frequency domain resources included in the time-frequency resource unit mapped by the data stream, thereby ensuring the performance of the receiving end in detecting the data stream.

[0059] With reference to the first aspect, in some possible implementations, a ratio of an EPRE of the data stream to an EPRE of the DMRS satisfies:

[0060] or,

[0061] Here, R represents the fourth value, and γ represents the second value.

[0062] In conjunction with the first aspect, in some possible implementations,

[0063] When the ratio of the EPRE of the data stream to the EPRE of the DMRS satisfies: When , the power scaling factor of the DMRS satisfies:

[0064] When the ratio of the EPRE of the data stream to the EPRE of the DMRS satisfies: When , the power scaling factor of the DMRS satisfies:

[0065] In combination with the first aspect, in some possible implementation methods, when the first reference signal is PTRS, determining the power scaling factor of the first reference signal includes: the power scaling factor is related to the ratio of the EPRE of the PTRS to the EPRE of the data stream, and the power scaling factor is the power scaling factor of the PTRS, wherein the ratio of the EPRE of the PTRS to the EPRE of the data stream is related to a fourth value and a third value, the M third resource sets are time-frequency resources within the second bandwidth, the fourth value is the total number of frequency domain resources included in the time-frequency resource unit mapped to the data stream within the second bandwidth, and the third value is the number of layers of the data stream.

[0066] For example, the power scaling factor of the PTRS is determined based on the ratio of the EPRE of the PTRS to the EPRE of the data stream, wherein the power scaling factor of the PTRS may be: the ratio of the EPRE of the data stream to the EPRE of the PTRS, or the power scaling factor of the PTRS may be: the ratio of the EPRE of the PTRS to the EPRE of the data stream. The calculation rules of the specific PTRS power scaling factor are not specifically limited in this application.

[0067] It should be understood that the third value is the number of layers of the PTRS-associated data stream, which can be used to indicate the number of layers of the data stream associated with the PTRS port. The number of layers of the data stream can be called the number of streams, or spatial layer data, etc.

[0068] Based on the above technical solution, the power scaling factor of PTRS is determined according to the ratio of the EPRE of PTRS to the EPRE of the data stream, wherein the ratio of the EPRE of the data stream to the EPRE of PTRS is related to the fourth value and the third value, that is, the calculation of the power scaling factor of PTRS is related to the total number of frequency domain resources included in the time-frequency resource unit mapped to the data stream, thereby ensuring the performance of the receiving end in detecting the data stream.

[0069] In conjunction with the first aspect, in some possible implementations, a ratio of the EPRE of the PTRS to the EPRE of the data stream satisfies:

[0070] or,

[0071] Here, R represents the fourth value, and L represents the third value.

[0072] In conjunction with the first aspect, in some possible implementations,

[0073] When the ratio of the EPRE of the PTRS to the EPRE of the data stream satisfies: When , the power scaling factor of the PTRS satisfies:

[0074] When the ratio of the EPRE of the PTRS to the EPRE of the data stream satisfies: When , the power scaling factor of the PTRS satisfies:

[0075] In a second aspect, a communication method is provided. The method may be executed by a second communication device, or may be executed by a chip or circuit for the second communication device, which is not limited in this application. For ease of description, the following description is based on an example of execution by the second communication device.

[0076] The method includes: determining indication information; sending the indication information to a first communication device, the indication information is used to indicate at least one first resource set, the first resource set is used by the first communication device to perform interference measurement, the first resource set belongs to the time-frequency resources mapped by the data stream, the data stream corresponds to a first reference signal, and the power scaling factor of the first reference signal is used by the first communication device to detect the data stream.

[0077] It should be understood that the first resource set includes at least one resource unit (e.g., a first resource). The first resource can be understood as a time-frequency resource unit in the time-frequency resources mapped to the data stream that is not used to transmit the data stream; or the first resource can be understood as a time-frequency resource unit in which the transmit power of the data stream on the first resource is zero; or the first resource can be referred to as a zero-power time-frequency interference measurement resource. At least one first resource in the first resource set is used by the first communication device to perform interference measurement.

[0078] It should also be understood that the time-frequency resources mapped to the data stream include the at least one first resource set, and the at least one first resource set is within the range of the time-frequency resources scheduled by the data stream.

[0079] According to the method provided in the present application, the second communication device sends indication information to the first communication device, and the indication information is used to indicate at least one first resource set, and the resources in the at least one first resource set are resources in the time-frequency resources mapped by the data stream that are not used to transmit the data stream. It can be seen that the resources in the at least one first resource set are not used to transmit the data stream, that is, the receiving end can obtain real interference data based on the resources in the at least one first resource set. Among them, the data stream corresponds to the first reference signal, and the power scaling factor of the first reference signal is used by the first communication device to detect the data stream. In the case that there are resources in the time-frequency resources mapped by the data stream that are not used to transmit the data stream, the first communication device detects the data stream according to the power scaling factor of the reference signal corresponding to the data stream, thereby improving the detection performance of the data stream at the receiving end.

[0080] In combination with the second aspect, in some possible implementations, the power scaling factor is related to the power EPRE of each resource unit corresponding to the first reference signal and the power EPRE of each resource unit corresponding to the data stream.

[0081] Exemplarily, the EPRE of the first reference signal may be the EPRE of a demodulation reference signal, or the EPRE of the first reference signal may be the EPRE of a phase tracking signal.

[0082] Optionally, the power scaling factor is related to the power EPRE of each resource unit corresponding to the first reference signal and the power EPRE of each resource unit corresponding to the data stream in a certain time unit.

[0083] The time unit may include one or more time domain resource units, for example, the time unit may include one or more symbols, time slots, or mini-time slots, etc. When the time unit includes multiple time domain resource units, the multiple time domain resource units may be continuous time domain resource units or discontinuous time domain resource units, which is not limited in this application.

[0084] In conjunction with the second aspect, in some possible implementations, when the first reference signal is a demodulation reference signal DMRS,

[0085] The power scaling factor is related to the ratio of the EPRE of the data stream to the EPRE of the DMRS, and the power scaling factor is the power scaling factor of the DMRS.

[0086] Among them, the ratio of the EPRE of the data stream to the EPRE of the DMRS is related to a first value and a second value, the first value is the ratio of the number of frequency domain resources included in the first resource set in the first time unit to the number of frequency domain resources included in the time-frequency resources mapped by the data stream in the first time unit, the first resource set is a resource set within a first bandwidth, the time-frequency resources mapped by the data stream are time-frequency resources within the first bandwidth, the time-frequency resources mapped by the data stream include at least one of the first resource set and the second resource set, the second resource set is the time-frequency resources mapped by the data stream for transmitting the data stream, and the second value is the number of DMRS code division multiplexing CDM groups that do not map the data stream.

[0087] For example, the power scaling factor of the DMRS is determined based on the ratio of the EPRE of the data stream to the EPRE of the DMRS, wherein the power scaling factor of the DMRS can be: EPRE of the data stream / EPRE of the DMRS, or the power scaling factor of the DMRS can be: EPRE of the DMRS / EPRE of the data stream. The calculation rules of the specific DMRS power scaling factor are not specifically limited in this application.

[0088] It should be understood that the first value can also be called the frequency domain density of the zero-power interference measurement resource, and the first value can be expressed as a / b, where a is the number of frequency domain resources included in the first resource set in the first time unit, and b is the number of frequency domain resources included in the time-frequency resources mapped to the data stream in the first time unit.

[0089] Based on the above technical solution, the power scaling factor of DMRS is determined according to the ratio of the EPRE of the data stream to the EPRE of DMRS, wherein the ratio of the EPRE of the data stream to the EPRE of DMRS is related to the first value and the second value, that is, the calculation of the power scaling factor of DMRS is related to the frequency domain density of the zero-power interference measurement resource, thereby ensuring the performance of the receiving end in detecting the data stream when there are resources that are not used to transmit the data stream in the time-frequency resources mapped by the data stream.

[0090] With reference to the second aspect, in some possible implementations, a ratio of an EPRE of the data stream to an EPRE of the DMRS satisfies:

[0091] or,

[0092] Here, ρ represents the first value, and γ represents the second value.

[0093] In conjunction with the second aspect, in some possible implementations,

[0094] When the ratio of the EPRE of the data stream to the EPRE of the DMRS satisfies: When , the power scaling factor of the DMRS satisfies:

[0095] When the ratio of the EPRE of the data stream to the EPRE of the DMRS satisfies: When , the power scaling factor of the DMRS satisfies:

[0096] In combination with the second aspect, in some possible implementation methods, when the first reference signal is PTRS, the power scaling factor of the first reference signal is related to the ratio of the EPRE of the PTRS to the EPRE of the data stream, and the power scaling factor is the power scaling factor of PTRS, wherein the ratio of the EPRE of the PTRS to the EPRE of the data stream is related to a first value and a third value, the first value is the ratio of the number of frequency domain resources included in the first time unit by the first resource set and the number of frequency domain resources included in the time-frequency resources mapped by the data stream in the first time unit, the first resource set is a resource set within a first bandwidth, the time-frequency resources mapped by the data stream are time-frequency resources within the first bandwidth, the time-frequency resources mapped by the data stream include at least one of the first resource set and a second resource set, the second resource set is the time-frequency resources mapped by the data stream for transmitting the data stream, and the third value is the number of layers of the data stream.

[0097] For example, the power scaling factor of the PTRS is determined based on the ratio of the EPRE of the PTRS to the EPRE of the data stream, where the power scaling factor of the PTRS can be: EPRE of the data stream / EPRE of the PTRS, or the power scaling factor of the PTRS can be: EPRE of the PTRS / EPRE of the data stream. The calculation rules of the specific PTRS power scaling factor are not specifically limited in this application.

[0098] Based on the above technical solution, the power scaling factor of PTRS is determined according to the ratio of EPRE of PTRS to EPRE of data stream, wherein the ratio of EPRE of PTRS to EPRE of data stream is related to the first value and the third value, that is, the calculation of the power scaling factor of PTRS is related to the frequency domain density of zero-power interference measurement resources, thereby ensuring the performance of the receiving end in detecting the data stream when there are resources in the time-frequency resources mapped by the data stream that are not used to transmit the data stream.

[0099] In conjunction with the second aspect, in some possible implementations, a ratio of the EPRE of the PTRS to the EPRE of the data stream satisfies:

[0100] β PTRS =(1-ρ)L, or, β PTRS =10log 10 (1-ρ)L

[0101] Here, ρ represents the first value, and L represents the second value.

[0102] In conjunction with the second aspect, in some possible implementations,

[0103] When the ratio of the EPRE of the PTRS to the EPRE of the data stream satisfies: β PTRS =(1-ρ)L, the power scaling factor of the PTRS satisfies:

[0104] When the ratio of the EPRE of the PTRS to the EPRE of the data stream satisfies: β PTRS =10log 10 (1-ρ)L, the power scaling factor of the PTRS satisfies:

[0105] In combination with the second aspect, in some possible implementation methods, at least one of the first resource sets includes M third resource sets in a second time unit, each of the M third resource sets includes m third resources, the time domain resources of the m third resources are the second time unit, and the m third resources correspond one-to-one to the ports of m reference signals, or the m third resources correspond to m first indexes, where M and m are both integers greater than or equal to 1.

[0106] It should be understood that the m third resources correspond one-to-one to the ports of the m reference signals, or it can be understood that the m third resources correspond one-to-one to the port indexes of the m reference signals.

[0107] Based on the above technical solution, the at least one first resource set includes M third resource sets on the same time domain resource (for example, the second time unit), and each resource set in the M third resource sets includes m third resources. The m third resources belong to the resources within the at least one first resource set, wherein the time domain resource of the m third resources is the second time unit. The third resources correspond one-to-one with the ports of the m reference signals, that is, a communication device associated with a reference signal port no longer transmits a data stream on a third resource corresponding to the reference signal port; or, the m third resources correspond one-to-one with the m first indexes, that is, a communication device associated with the first index no longer transmits a data stream on the third resource corresponding to the first index.

[0108] In combination with the second aspect, in some possible implementations, the indication information is also used to indicate a first port, or a second index, the m reference signal ports include a first port, and the m first indexes include a second index, wherein the at least one first resource set includes at least one first resource, and the first resource is determined by the first communication device based on m third resources and the first port, or the first resource is determined by the first communication device based on m third resources and the second index.

[0109] It should be understood that the information used by the second communication device to indicate the first port or the second index can also be carried in other information and sent to the first communication device, or carried in the same information (such as indication information) as indicating at least one first resource set and sent to the first communication device.

[0110] It should also be understood that the indication information is used to indicate the first port (or the index of the first port), and the first communication device determines the first resource from the m third resources based on the first port and the first rule. Alternatively, the indication information is used to indicate the second index, and the first communication device determines the first resource from the m third resources based on the second index and the first rule. The first rule may be predefined by the system or configured by the second communication device for the first communication device.

[0111] For example, the first communication device selects a third resource corresponding to a certain port index (eg, the minimum or maximum port index) in the first port according to the first port and the first rule, and determines the first resource.

[0112] In combination with the second aspect, in some possible implementations, when the reference signal is DMRS, the value of m is related to the type of DMRS, or m is the maximum value of a multi-user multi-input multi-output communication device supported by the second communication device.

[0113] In conjunction with the second aspect, in some possible implementations, when the first reference signal is a DMRS,

[0114] The power scaling factor is related to the ratio of the EPRE of the data stream to the EPRE of the DMRS, and the power scaling factor is the power scaling factor of the DMRS.

[0115] In which, the ratio of the EPRE of the data stream to the EPRE of the DMRS is related to the fourth value and the second value, the M third resource sets are time-frequency resources within the second bandwidth, the fourth value is the total number of frequency domain resources included in the time-frequency resource unit mapped by the data stream within the second bandwidth, and the second value is the number of DMRS code division multiplexing CDM groups that do not map the data stream.

[0116] For example, the power scaling factor of the DMRS is determined based on the ratio of the EPRE of the data stream to the EPRE of the DMRS, wherein the power scaling factor of the DMRS can be: EPRE of the data stream / EPRE of the DMRS, or the power scaling factor of the DMRS can be: EPRE of the DMRS / EPRE of the data stream. The calculation rules of the specific DMRS power scaling factor are not specifically limited in this application.

[0117] Based on the above technical solution, the power scaling factor of DMRS is determined according to the ratio of the EPRE of the data stream to the EPRE of DMRS, wherein the ratio of the EPRE of the data stream to the EPRE of DMRS is related to the fourth value and the second value, that is, the calculation of the power scaling factor of DMRS is related to the total number of frequency domain resources included in the second bandwidth of the time-frequency resource unit mapped to the data stream, thereby ensuring the performance of the receiving end in detecting the data stream.

[0118] With reference to the second aspect, in some possible implementations, a ratio of an EPRE of the data stream to an EPRE of the DMRS satisfies:

[0119] or,

[0120] Here, R represents the fourth value, and γ represents the second value.

[0121] In conjunction with the second aspect, in some possible implementations,

[0122] When the ratio of the EPRE of the data stream to the EPRE of the DMRS satisfies: When , the power scaling factor of the DMRS satisfies:

[0123] When the ratio of the EPRE of the data stream to the EPRE of the DMRS satisfies: When , the power scaling factor of the DMRS satisfies:

[0124] In conjunction with the second aspect, in some possible implementations, when the first reference signal is PTRS,

[0125] The power scaling factor is related to the ratio of the EPRE of the PTRS to the EPRE of the data stream, and the power scaling factor is the power scaling factor of the PTRS.

[0126] Among them, the ratio of the EPRE of the PTRS to the EPRE of the data stream is related to the fourth value and the third value, the M third resource sets are time-frequency resources within the second bandwidth, the fourth value is the total number of frequency domain resources included in the time-frequency resource unit mapped to the data stream within the second bandwidth, and the third value is the number of layers of the data stream associated with the PTRS.

[0127] In conjunction with the second aspect, in some possible implementations, a ratio of the EPRE of the PTRS to the EPRE of the data stream satisfies:

[0128] or,

[0129] Here, R represents the fourth value, and L represents the third value.

[0130] In conjunction with the second aspect, in some possible implementations,

[0131] When the ratio of the EPRE of the PTRS to the EPRE of the data stream satisfies: When , the power scaling factor of the PTRS satisfies:

[0132] When the ratio of the EPRE of the PTRS to the EPRE of the data stream satisfies: When , the power scaling factor of the PTRS satisfies:

[0133] According to a third aspect, a first communication device is provided, such as a terminal device or a chip or circuit of a terminal device, the first communication device including: a transceiver unit and a processing unit, the transceiver unit being used to receive indication information from a second communication device, the indication information being used to indicate at least one first resource set, the first resource set being used by the first communication device to perform interference measurement, the first resource set belonging to a time-frequency resource mapped to a data stream, the data stream corresponding to a first reference signal; the processing unit being used to determine a power scaling factor of the first reference signal, the power scaling factor being used to detect the data stream.

[0134] The transceiver unit can perform the reception and transmission processing in the aforementioned first aspect, and the processing unit can perform other processing except reception and transmission in the aforementioned first aspect.

[0135] In a fourth aspect, a second communication device is provided, such as a network device or a chip or circuit of a network device. The second communication device includes a transceiver unit and a processing unit, the processing unit being configured to determine indication information; the transceiver unit being configured to send the indication information to a first communication device, the indication information being configured to indicate at least one first resource set, the first resource set being used by the first communication device to perform interference measurement, the first resource set being a time-frequency resource mapped to the data stream, the data stream corresponding to a first reference signal, and the power scaling factor of the first reference signal being used by the first communication device to detect the data stream.

[0136] The transceiver unit can perform the reception and transmission processing in the aforementioned second aspect, and the processing unit can perform other processing except reception and transmission in the aforementioned second aspect.

[0137] In a fifth aspect, a communication device is provided, comprising a transceiver, a processor and a memory, wherein the processor is used to control the transceiver to transmit and receive signals, the memory is used to store a computer program, and the processor is used to call and run the computer program from the memory, so that the communication device executes the method in any possible implementation of the first to second aspects above.

[0138] Optionally, there are one or more processors and one or more memories.

[0139] Optionally, the memory may be integrated with the processor, or the memory may be provided separately from the processor.

[0140] Optionally, the communication device further includes a transmitter (transmitter) and a receiver (receiver).

[0141] In the sixth aspect, a communication system is provided, comprising a first communication device and a second communication device; the first communication device is used to execute the method in any possible implementation of the above-mentioned first aspect, and the second communication device is used to execute the method in any possible implementation of the above-mentioned second aspect.

[0142] In the seventh aspect, a computer-readable storage medium is provided, which stores a computer program or code. When the computer program or code is run on a computer, the computer executes the method in any possible implementation of the first to second aspects above.

[0143] In the eighth aspect, a chip is provided, comprising at least one processor, wherein the at least one processor is coupled to a memory, the memory being used to store a computer program, and the processor being used to call and run the computer program from the memory, so that a device equipped with the chip system executes the method in any possible implementation of the above-mentioned first to second aspects.

[0144] The chip may include an input circuit or interface for sending information or data, and an output circuit or interface for receiving information or data.

[0145] In a ninth aspect, a computer program product is provided, comprising: a computer program code, which, when executed on a communication device, enables the device to execute a method in any one of the possible implementations of the first to second aspects above. BRIEF DESCRIPTION OF THE DRAWINGS

[0146] FIG1 is a schematic diagram of a wireless communication system applicable to an embodiment of the present application.

[0147] FIG2 is a schematic diagram of a time-frequency resource mapping method of a DMRS configuration type.

[0148] FIG3 is a schematic diagram of interference measurement based on DMRS.

[0149] FIG4 is a flow chart of a communication method provided in an embodiment of the present application.

[0150] FIG5 is a schematic diagram of zero-power interference measurement resources.

[0151] FIG6 is a schematic diagram of time-frequency resource mapping of zero-power interference measurement resources.

[0152] FIG7 is a schematic diagram of another time-frequency resource mapping of zero-power interference measurement resources.

[0153] FIG8 is a schematic diagram of yet another time-frequency resource mapping of zero-power interference measurement resources.

[0154] FIG9 is a schematic structural diagram of a communication device 1000 provided in an embodiment of the present application.

[0155] FIG10 is a schematic structural diagram of a communication device 2000 provided in an embodiment of the present application.

[0156] FIG11 is a schematic structural diagram of a chip system 3000 provided in an embodiment of the present application. DETAILED DESCRIPTION

[0157] The technical solutions in the embodiments of the present application will be described below with reference to the accompanying drawings.

[0158] The technical solutions provided in this application can be applied to various communication systems, such as: fifth generation (5G) or new radio (NR) systems, long term evolution (LTE) systems, LTE frequency division duplex (FDD) systems, LTE time division duplex (TDD) systems, etc. The technical solutions provided in this application can also be applied to future communication systems, such as sixth generation (6G) mobile communication systems. The technical solutions provided in this application can also be applied to device to device (D2D) communication, vehicle-to-everything (V2X) communication, machine to machine (M2M) communication, machine type communication (MTC), and Internet of Things (IoT) communication systems or other communication systems.

[0159] As an example, V2X communication may include: vehicle-to-vehicle (V2V) communication, vehicle-to-roadside infrastructure (V2I) communication, vehicle-to-pedestrian (V2P) communication, and vehicle-to-network (V2N) communication. V2V refers to communication between vehicles. V2P refers to communication between vehicles and people (including pedestrians, cyclists, drivers, or passengers, etc.). V2I refers to communication between vehicles and infrastructure, such as road side units (RSU) or network equipment. Among them, RSU includes two types: terminal-type RSU, which is in a non-mobile state because it is located on the roadside and does not need to consider mobility; base station-type RSU, which can provide timing synchronization and resource scheduling to vehicles communicating with it. V2N refers to communication between vehicles and network equipment. It can be understood that the above is an exemplary description and the embodiments of the present application are not limiting. For example, V2X can also include the current 3GPP Rel-16 and subsequent versions of V2X communications based on the NR system.

[0160] The terminal device in the embodiments of the present application may also be referred to as user equipment (UE), customer premises equipment (CPE), access terminal, user unit, user station, mobile station, mobile station, remote station, remote terminal, mobile device, user terminal, terminal, wireless communication device, user agent or user device.

[0161] The terminal device can be a device that provides voice / data to users, for example, a handheld device or vehicle-mounted device with a wireless connection function. At present, some examples of terminals are: mobile phones, tablet computers, laptop computers, 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, wireless terminals in remote medical surgery, wireless terminals in smart grids, wireless terminals in transportation safety, wireless terminals in smart cities, wireless terminals in smart homes, cellular phones, cordless phones, session initiation protocol (SIP) phones, wireless local loop (WLL) stations, personal digital assistants (PDAs), handheld devices with wireless communication capabilities, computing devices or other processing devices connected to wireless modems, wearable devices, terminal devices in 5G networks or future evolved public land mobile communication networks (PLMNs). The terminal equipment in the network (PLMN), etc., is not limited to this in the embodiments of the present application.

[0162] As an example and not a limitation, in the embodiment of the present application, the terminal device may also be a wearable device. Wearable devices may also be called wearable smart devices, which are a general term for wearable devices that are intelligently designed and developed using wearable technology for daily wear, such as glasses, gloves, watches, clothing, and shoes. A wearable device is a portable device that is worn directly on the body or integrated into the user's clothes or accessories. Wearable devices are not only hardware devices, but also achieve powerful functions through software support, data interaction, and cloud interaction. Broadly speaking, wearable smart devices include those that are fully functional, large in size, and can achieve complete or partial functions without relying on smartphones, such as smart watches or smart glasses, as well as those that only focus on a certain type of application function and need to be used in conjunction with other devices such as smartphones, such as various smart bracelets and smart jewelry for vital sign monitoring.

[0163] In the embodiments of the present application, the device for implementing the function of the terminal device, i.e., the terminal device, can be the terminal device, or a device capable of supporting the terminal device to implement the function, such as a chip system or chip, which can be installed in the terminal device. In the embodiments of the present application, the chip system can be composed of a chip, or can include a chip and other discrete devices.

[0164] The network device in the embodiments of the present application may be a device for communicating with a terminal device, and may also be referred to as an access network device or a radio access network device. For example, the network device may be a base station. The network device in the embodiments of the present application may refer to a radio access network (RAN) node (or device) that connects a terminal device to a wireless network. A base station may broadly cover various names as follows, or replace the following names, such as: NodeB, evolved NodeB (eNB), next generation NodeB (gNB), relay station, access point, transmitting and receiving point (TRP), transmitting point (TP), master station, secondary station, multi-standard radio (motor slide retainer, MSR) node, home base station, network controller, access node, wireless node, access point (AP), transmission node, transceiver node, baseband unit (BBU), remote radio unit (RRU), active antenna unit (AAU), remote radio head (RRH), central unit (CU), distributed unit (DU), positioning node, etc. A base station may be a macro base station, a micro base station, a relay node, a donor node, or the like, or a combination thereof. A base station may also refer to a communication module, modem, or chip used to be set in the aforementioned equipment or device. A base station may also be a mobile switching center and a device that performs base station functions in D2D, V2X, and M2M communications, a network-side device in a 6G network, or a device that performs base station functions in future communication systems. A base station may support networks with the same or different access technologies. The embodiments of this application do not limit the specific technology and specific device form used by network equipment.

[0165] Base stations can be fixed or mobile. For example, a helicopter or drone can be configured to act as a mobile base station, and one or more cells can move based on the location of the mobile base station. In other examples, a helicopter or drone can be configured to act as a device that communicates with another base station.

[0166] In some deployments, the network device mentioned in the embodiments of the present application may be a device including a CU, or a DU, or a device including a CU and a DU, or a control plane CU node (central unit control plane (central unit-control plane, CU-CP)) and a user plane CU node (central unit user plane (central unit-user plane, CU-UP)) and a DU node.

[0167] In different systems, CU (or CU-CP and CU-UP), DU or RU may also have different names, but those skilled in the art can understand their meanings. For example, in an open RAN (ORAN) system, CU may also be referred to as O-CU (open CU), DU may also be referred to as O-DU, CU-CP may also be referred to as O-CU-CP, CU-UP may also be referred to as O-CU-UP, and RU may also be referred to as O-RU. Any of the CU (or CU-CP, CU-UP), DU and RU in this application may be implemented by a software module, a hardware module, or a combination of a software module and a hardware module.

[0168] In the embodiments of the present application, the apparatus for implementing the function of the network device can be the network device, or it can be an apparatus capable of supporting the network device to implement the function, such as a chip system or chip, which can be installed in the network device. In the embodiments of the present application, the chip system can be composed of a chip, or it can include a chip and other discrete devices.

[0169] The network equipment and terminal devices can be deployed on land, including indoors or outdoors, handheld or vehicle-mounted; they can also be deployed on water; they can also be deployed in the air on aircraft, balloons, and satellites. The embodiments of this application do not limit the scenarios in which the network equipment and terminal devices are located.

[0170] The embodiments of the present application are applicable to both homogeneous and heterogeneous network scenarios. The embodiments of the present application are also applicable to low-frequency scenarios (sub 6G) and high-frequency scenarios (above 6G). The embodiments of the present application are also applicable to single-transmission point (Single-TRP) or multi-transmission point (Multi-TRP) scenarios, as well as any derivative thereof.

[0171] The following briefly introduces a communication system applicable to an embodiment of the present application in conjunction with FIG1 , as follows.

[0172] FIG1 is a schematic diagram of a wireless communication system applicable to an embodiment of the present application. As shown in FIG1 , the communication system 100 may include at least one network device, such as the network device 101 shown in FIG1 . The communication system 100 may also include at least one terminal device, such as the terminal devices 102 to 107 shown in FIG1 . Terminal devices 102 to 107 may be mobile or fixed. Network device 101 may provide communication coverage for a specific geographic area, and terminal devices 102 to 107 may be terminal devices located within the coverage area. Network device 101 and one or more of terminal devices 102 to 107 may communicate via a wireless link.

[0173] Optionally, terminal devices can communicate directly with each other. For example, direct communication between terminal devices can be achieved using device-to-device (D2D) technology. As shown in Figure 1, terminal devices 105 and 106, and terminal devices 105 and 107 can communicate directly using D2D technology. Terminal devices 106 and 107 can communicate with terminal device 105 individually or simultaneously.

[0174] Terminal devices 105 to 107 may also communicate with network device 101 respectively. For example, they may communicate directly with network device 101, as shown in the figure, as terminal devices 105 and 106 may communicate directly with network device 101; or they may communicate indirectly with network device 101, as shown in the figure, as terminal device 107 communicates with network device 101 via terminal device 105.

[0175] Each communication device in the communication system 100 shown in Figure 1 can be configured with multiple antennas. For each communication device, the multiple antennas configured may include at least one transmit antenna for sending signals and at least one receive antenna for receiving signals. Therefore, the communication devices in the communication system 100 can communicate with each other using multiple-input multiple-output (MIMO) technology.

[0176] It should be understood that Figure 1 is merely a simplified schematic diagram for ease of understanding, and the communication system 100 may also include other network devices or other terminal devices, which are not shown in Figure 1. The embodiments of the present application may be applicable to any communication scenario in which a transmitting device and a receiving device communicate.

[0177] The following describes in detail a method for transmitting and receiving a reference signal according to an embodiment of the present application, using a DMRS as an example reference signal, in conjunction with the accompanying drawings. It should be understood that in the following method, the transmitting end device may correspond to, for example, the network device 101 in Figure 1, and the receiving end device may correspond to any one of the multiple terminal devices in Figure 1 that are communicatively connected to the network device, such as any one of the terminal devices 102 to 107 in Figure 1.

[0178] It should be noted that the embodiments of the present application do not specifically limit the specific structure of the execution subject of the method provided in the embodiments of the present application. As long as it is possible to communicate according to the method provided in the embodiments of the present application by running a program that records the code of the method provided in the embodiments of the present application, for example, the execution subject of the method provided in the embodiments of the present application can be a terminal device and a network device, or a functional module in the terminal device and the network device that can call and execute the program.

[0179] Multi-antenna MIMO technology configures multiple transmit antennas and receive antennas at the transmitter and receiver. It can simultaneously send multiple data streams (also called spatial layers or spatial streams) within the same time-frequency resources through spatial division multiplexing, thereby significantly improving the system's spectrum efficiency and throughput performance.

[0180] For example, in one possible implementation, for a MU-MIMO system, assume that the maximum transmission data stream (or spatial layer) rank supported by the kth user is R. The data vector s sent by the kth user in one time-frequency resource unit is k =(s k,1 ,s k,2 ,…,s k,L ) T , where s k,l represents the transmitted data symbol corresponding to the lth spatial layer of the kth user, 1≤l≤R, R represents the rank of transmission, also known as the number of transmitted data streams or the number of spatial layers. The channel matrix between the transmitter (for example, a network device) and the kth user is denoted as H k Assuming k users perform MU-MIMO paired transmission, the precoding matrix corresponding to the R data streams corresponding to the kth user is W k The precoded transmission vector can be expressed as:

[0181] Accordingly, the signal response vector received by the kth user can be expressed as:

[0182] Among them, n k represents the noise vector corresponding to the k-th user. is the intra-cell multi-user interference (also called intra-cell interference). kIt represents the inter-cell interference vector corresponding to the k-th user, and represents the interference signals from other adjacent cells received by each receiving antenna of the k-th user.

[0183] In general, in order to reduce the interference between MU paired users and improve MU-MIMO performance, the precoding matrix is ​​often designed to suppress the interference within the cell so that the interference signal received by the kth user is The power is as small as possible. For example, linear precoding is a low-complexity, simple and efficient precoding method that is widely used in existing systems. Taking eigen zero forcing (EZF) precoding as an example, the MU-MIMO precoding matrix W = [W1W2…W K ] can be designed as:

[0184] in, It is obtained based on the channel matrix of the kth user. In one implementation, It can be the channel matrix H of the kth user k The matrix of eigenvectors corresponding to the strongest R eigenvalues. is the matrix V k The submatrix consisting of the first R column vectors of . Represents the power normalization factor.

[0185] Accordingly, the receiving end needs to perform MIMO detection on the signals received by multiple receiving antennas to obtain the estimation result of the transmitted signal. Specifically, for the kth user, the useful signal equivalent channel H can be obtained through the downlink reference signal (such as DMRS). k W k The estimation results of the interference are obtained. The data signal of each data stream is further estimated through MIMO equalization or MIMO detection. Among them, linear MIMO equalization is a simple and efficient method. Taking minimum mean squared error (MMSE) equalization as an example, the MIMO equalization matrix can be expressed as The received signal vector y corresponding to multiple receiving antennas k Perform MIMO equalization as follows:

[0186] in, Represents the detection signal vector corresponding to R spatial layers after MIMO equalization, R nn represents the covariance matrix of the interference channel, σ 2represents the equivalent noise power, and I is the identity matrix. It can be seen that MIMO equalization is related to the interference channel. Accurate interference channel estimation can achieve better MIMO detection performance.

[0187] To facilitate understanding of the embodiments of the present application, a brief description of the terms or technologies involved in the present application is first given.

[0188] 1) Antenna port

[0189] Antenna port is referred to as port. It can be understood as a transmitting antenna identified by the receiving end, or a transmitting antenna that can be distinguished in space. The transmitting antenna can be a virtual antenna or a spatial resource. The receiving end can be a network device or a terminal device. Each virtual antenna or spatial resource can correspond to an antenna port, and each virtual antenna can be a weighted combination of multiple physical antennas. Depending on the signal carried, the antenna port can be divided into a reference signal port and a data port. Among them, the reference signal port can include but is not limited to an SRS port, a DMRS port, a channel state information reference signal (CSI-RS) port, etc. For a DMRS port, each antenna port corresponds to a spatial stream or spatial layer. Each DMRS port corresponds to a port index. Each DMRS port corresponds to a DMRS sequence, and each DMRS port corresponds to one or more time-frequency resources. The corresponding DMRS sequence is mapped according to the rules in the time-frequency resource unit contained in one or more time-frequency resources. The DMRS sequence can also be called a DMRS symbol sequence or a DMRS symbol vector. A time-frequency resource unit can be a frequency-domain subcarrier, an orthogonal frequency division multiplexing (OFDM) symbol, or a resource element (RE). For an SRS port, each antenna port corresponds to a terminal antenna, also known as a terminal receive antenna or terminal antenna port. Each SRS port corresponds to an SRS sequence, which is mapped into the corresponding time-frequency resource unit.

[0190] In this application, the port corresponding to port index X can be simply referred to as port X. Port index X can also correspond to port index 1000+X, where X is an integer. For example, the port corresponding to port index 0 can be simply referred to as port 0, and the port corresponding to port index 1 can be simply referred to as port 1. For example, port index 1000 can also represent port index 0, and port index 1001 can also represent port index 1. In other words, the port corresponding to port index 1000 or port index 0 can be simply referred to as port 0. The port corresponding to port index 1001 or port index 1 can be simply referred to as port 1.

[0191] In this application, the reference signal takes DMRS as an example, but is not limited to this. For example, it can also be other reference signals, such as channel state information reference signal CSI-RS, channel sounding reference signal (SRS), phase tracking reference signal (PTRS), tracking reference signal (TRS), etc.

[0192] 2) Spatial layer

[0193] In a spatially multiplexed MIMO system, multiple parallel data streams can be transmitted simultaneously on the same time-frequency resources. Each data stream is called a spatial layer, spatial stream, or layer. For a terminal device, the number of spatial layers or data streams transmitted or received is also called the rank. The number of spatial layers or data streams transmitted or received is also called the rank value or rank value. A spatial layer can also be called a layer, data stream, or stream.

[0194] 3) Dedicated demodulation reference signal (DMRS)

[0195] DMRS is used to estimate the equivalent channel matrix of a data channel or a control channel, thereby being used for data detection and demodulation. Exemplarily, the data channel may be a physical downlink shared channel (PDSCH) or a physical uplink shared channel (PUSCH), and the control channel may be a physical downlink control channel (PDCCH) or a physical uplink control channel (PDCCH).

[0196] Taking the data channel PDSCH as an example, DMRS is usually precoded in the same way as the transmitted data signal, ensuring that the DMRS and the data signal experience the same equivalent channel. Assume that the DMRS vector sent by the transmitter is s and the data signal vector sent is x. The DMRS and the data signal are precoded in the same way (multiplied by the same precoding matrix). The data signal vector y and DMRS vector r received by the receiver can be expressed by formula (1) and formula (2), respectively:

[0197] in, represents the equivalent channel experienced by the data signal and DMRS, and n represents additive noise. Based on the known DMRS vector s, the receiver uses channel estimation algorithms such as least squares (LS) channel estimation and minimum mean square error (MMSE) channel estimation to obtain the equivalent channel. The data signal can be demodulated based on the equivalent channel.

[0198] With the introduction of MIMO technology into wireless communication systems, the transmitter can transmit multi-stream data on the same time-frequency resources, and the receiver can recover all of them. At this time, DMRS is used to estimate the equivalent channel matrix, whose dimension can be N R ×R, where N R represents the number of terminal receive antennas, and R represents the number of transmission streams (also known as the number of transmission layers, spatial layers, or Rank). Typically, one DMRS port corresponds to one transmission stream. That is, for MIMO transmission with R transmission streams, R DMRS ports are required. To ensure channel estimation quality, different DMRS ports are typically orthogonal, and the DMRS symbols corresponding to different DMRS ports are orthogonal in the frequency, time-frequency, or code domain.

[0199] Because DMRS occupies time-frequency resources, its overhead needs to be minimized. To reduce mutual interference, the DMRS resources corresponding to multiple DMRS ports are often mapped to pre-defined time-frequency resources through frequency division multiplexing (FDM), time division multiplexing (TDM), or code division multiplexing (CDM). Currently, 5G NR supports two types of DMRS resource mapping: Type 1 DMRS and Type 2 DMRS. Type 1 DMRS supports up to eight orthogonal ports, while Type 2 DMRS supports up to 12 orthogonal ports. To perform channel estimation for different time-frequency resources and ensure channel estimation quality, multiple DMRS symbols must be transmitted across multiple time-frequency resources for a single DMRS port. DMRS can occupy at least one OFDM symbol in the time domain and the same bandwidth in the frequency domain as the scheduled data signal. Multiple DMRS symbols corresponding to a port correspond to a DMRS sequence. A DMRS sequence includes multiple DMRS sequence elements. A reference signal sequence corresponding to a DMRS port is mapped to the corresponding time-frequency resource after being multiplied by the corresponding mask sequence according to a preset time-frequency resource mapping rule.

[0200] Taking the case where the DMRS sequence is generated by the gold sequence as an example, the nth DMRS sequence element in the DMRS sequence r(n) can be generated by the following formula:

[0201] Among them, the pseudo-random sequence c(n) can be a gold sequence with a sequence length of 31. For an output length of M PN The sequence c(n), n=0,1,...,M PN -1, can be determined by formula (4):

[0202] c(n)=(x1(n+N C )+x2(n+N C ))mod2

[0203] x1(n+31)=(x1(n+3)+x1(n))mod2

[0204] x2(n+31)=(x2(n+3)+x2(n+2)+x2(n+1)+x2(n))mod2 (4)

[0205] Among them, N C=1600, the first m sequence x1(n) can be initialized to x1(0)=1, x1(n)=0, n=1, 2, ..., 30, and the second m sequence x2(n) can be initialized by parameter c init Initialization, c init It can be determined by formula (5):

[0206] Wherein, l represents the index value of the OFDM symbol on a time slot; is the number of symbols contained in a time slot; is the time slot index within a system frame; It is an initialization parameter, and its value can be 0 or 1; Indicates the time slot index within a system frame, Can be configured by higher-layer signaling. Related to the cell ID (identification), usually equal to the cell ID, λ represents the code division multiplexing (CDM) group index corresponding to the DMRS port.

[0207] Currently, the NR protocol supports two types of DMRS resource mapping. Type 1 DMRS supports up to eight orthogonal ports, while Type 2 DMRS supports up to 12 orthogonal ports. To perform channel estimation for different time-frequency resources and ensure channel estimation quality, multiple DMRS symbols must be sent across multiple time-frequency resources for a single DMRS port. DMRS can occupy at least one OFDM symbol in the time domain and the same bandwidth in the frequency domain as the scheduled data signal.

[0208] The DMRS sequence corresponding to a DMRS port can be mapped to the corresponding time-frequency resource through the preset time-frequency resource mapping rule. For antenna port p (corresponding to DMRS port p), the mth sequence element r(m) in the corresponding DMRS sequence can be mapped to the index according to the mapping rule shown in formula (6). RE on:

[0209] Among them, the index is The RE corresponds to the OFDM symbol with index 1 in a time slot in the time domain and to the subcarrier with index k in the frequency domain. To map to index (k,l) p,μ The DMRS modulation symbol corresponding to the DMRS port p on the RE, Δ is the subcarrier offset factor; μ is the subcarrier spacing; is the index of the starting OFDM symbol occupied by the DMRS modulation symbol or the index of the reference OFDM symbol; is the power scaling factor; w f (k′) is the frequency domain mask element corresponding to the subcarrier indexed by k′, w t (l′) is the time domain mask element corresponding to the OFDM symbol with index l′.

[0210] For the configuration type 1 (Type 1 DMRS) mapping rule, the DMRS port p corresponds to w f (k ′ ), w t (l ′ ), and the value of Δ can be determined according to Table 1.

[0211] Table 1

[0212] For the configuration type 2 (Type 2 DMRS) mapping rule, the DMRS port p corresponds to w f (k′), w t (l ′ ), and the value of Δ can be determined according to Table 2.

[0213] Table 2

[0214] Among them, λ is the index of the orthogonal multiplexing (CDM) group to which port p belongs, and the DMRS ports in the same CDM group occupy the same time-frequency resources. According to the above formula (6), for configuration type 1 (Type 1 DMRS), its time-frequency resource mapping method is shown in Figure 2 (a). For single-symbol DMRS (corresponding to l′=0), a maximum of 4 ports are supported, and the DMRS resources occupy one OFDM symbol. The 4 DMRS ports are divided into 2 code division multiplexing groups (CDM groups), where CDM group 0 contains port 0 / 1; CDM group 1 contains port 2 / 3. CDM group 0 and CDM group 1 are frequency division multiplexing, and the ports corresponding to CDM group 0 and CDM group 1 are mapped to different frequency domain resources. The DMRS ports contained in the CDM group are mapped to the same time-frequency resources. The reference signals corresponding to the DMRS ports included in the CMD group are distinguished by an orthogonal cover code (OCC), thereby ensuring the orthogonality of the DMRS ports within the CDM group, thereby suppressing interference between DMRS transmitted on different antenna ports. For dual-symbol DMRS, a maximum of 8 ports are supported. The 8 DMRS ports are divided into 2 code division multiplexing groups (CDM groups), where CDM group 0 includes ports 0 / 1 / 4 / 5; CDM group 1 includes ports 2 / 3 / 6 / 7. CDM group 0 and CDM group 1 are frequency division multiplexed, and the reference signals corresponding to the DMRS ports included in the CMD group are distinguished by an OCC, thereby ensuring the orthogonality of the DMRS ports within the CDM group, thereby suppressing interference between DMRS transmitted on different antenna ports.

[0215] For example, for CDM group 0, DMRS port 0 and port 1 are located in the same resource element RE, and resource mapping is performed in a comb-tooth manner in the frequency domain (one subcarrier is separated between adjacent occupied frequency domain resources). For a DMRS port, the two adjacent occupied REs correspond to a frequency domain OCC codeword sequence of length 2. For example, for subcarrier 0 and subcarrier 2, port 0 and port 1 use a set of frequency domain OCC codeword sequences (+1+1 / +1-1). Port 0 and port 4 use the same frequency domain OCC codeword, and the orthogonality between the two ports is guaranteed by time domain OCC.

[0216] For configuration type 2 (Type 2 DMRS), its time-frequency resource mapping method is shown in (b) of Figure 2. For single-symbol Type 2 DMRS, a maximum of 6 ports are supported. The 6 DMRS ports are divided into 3 code division multiplexing groups (CDM groups). Frequency division multiplexing is used between CDM groups, and the reference signals corresponding to the DMRS ports contained in the CDM are guaranteed to be orthogonal through OCC. Among them, CDM group 0 contains port 0 and port 1; CDM group 1 contains port 2 and port 3; CDM group 2 contains port 4 and port 5. Frequency division multiplexing is used between CDM groups (mapped on different frequency domain resources). The reference signals corresponding to the DMRS ports contained in the CDM group are mapped on the same time-frequency resources. The reference signals corresponding to the DMRS ports contained in the CMD group are distinguished by OCC. For a DMRS port, its corresponding DMRS reference signal is mapped in the frequency domain to multiple resource subblocks containing 2 consecutive subcarriers, and the adjacent resource subblocks are separated by 4 subcarriers in the frequency domain. For dual-symbol Type 2 DMRS, a maximum of 12 ports are supported. The 12 DMRS ports are divided into 3 CDM groups, and frequency division multiplexing is adopted between CDM groups. The reference signals corresponding to the DMRS ports contained in the CDM are ensured to be orthogonal through OCC. Among them, CDM group 0 contains port 0, port 1, port 6 and port 7; CDM group 1 contains port 2, port 3, port 8 and port 9; CDM group 2 contains port 4, port 5, port 10 and port 11. Frequency division multiplexing is used between CDM groups (mapped on different frequency domain resources). The reference signals corresponding to the DMRS ports contained in the CMD group are mapped on the same time-frequency resources. The reference signals corresponding to the DMRS ports contained in the CMD group are distinguished by OCC. For a DMRS port, its corresponding DMRS reference signal is mapped in the frequency domain to multiple resource subblocks containing 2 consecutive subcarriers, and the adjacent resource subblocks are separated by 4 subcarriers in the frequency domain. The frequency domain OCC and time domain OCC corresponding to the ports in each CDM group and the time-frequency resource mapping principle are the same as those of Type 1 DMRS and are not described in detail here.

[0217] 4)OCC

[0218] Orthogonal masking is used to multiplex reference signals within the same time-frequency resources to ensure orthogonality between ports. Based on the OCC mapping dimension, OCCs can be divided into two categories: frequency-domain OCCs (denoted as FD-OCCs) and time-domain OCCs (denoted as TD-OCCs). Accordingly, OCC lengths can also be divided into two categories: FD-OCC length and TD-OCC length.

[0219] 5) Time domain unit and frequency domain unit

[0220] Data or information can be carried through time-frequency resources.

[0221] In the time domain, the time domain resource may include one or more time domain units (or may also be referred to as time units).

[0222] In an embodiment of the present application, a time unit (e.g., a first time unit, a second time unit) may include several time domain resources. The time domain unit is, for example, a radio frame (RF), and the time domain resources included in the time domain unit are, for example, a subframe, a frame, a half subframe or a half frame, a time slot, a mini-slot, a partial slot, or an OFDM symbol, etc. Alternatively, the time domain unit may also be a collection of one or more time domain resources, for example, the time domain unit is one or more OFDM symbols in a time slot, for example, the number of the one or more is 6, 7, 12 or 14, etc. One or more time units may be continuous or discrete in time.

[0223] In addition, the duration of a time slot can be related to the sub-carrier space (SCS) spacing. For example, when the sub-carrier spacing is 15 kHz, the duration of a time slot is 1 millisecond (ms); when the sub-carrier spacing is 30 kHz, the duration of a time slot is 0.5 ms; when the sub-carrier spacing is 60 kHz, the duration of a time slot is 0.25 ms. Similarly, when the sub-carrier spacing is 15*2u kHz, the duration of a time slot is 2-u ms, where u = 0, 1, 2, ...

[0224] In the frequency domain, frequency domain resources can include one or more frequency domain units. A frequency domain unit can be a resource block (RB), a subchannel, a resource pool, a bandwidth, a bandwidth part (BWP), a carrier (CC), a subcarrier, a channel, or an interlace RB, etc.

[0225] The above briefly describes the terms involved in this application, which will not be repeated in the following embodiments. In addition, the above description of terms is only for ease of understanding and does not limit the scope of protection of the embodiments of this application.

[0226] At present, the NR protocol supports more flexible allocation of time-frequency resources for data channels (such as PDSCH). Taking into account the needs of different services, the time-frequency resource locations allocated to data channels in different cells may be different. For example, the starting time domain unit (OFDM symbol in the time slot) of the data channel PDSCH may be different, or the length of the time domain OFDM symbol mapped by PDSCH is different. Alternatively, different cells can flexibly configure DMRS for terminal devices. For example, a cell can flexibly select different DMRS types (for example, Type 1 DMRS, Type 2 DMRS) for terminal devices, and can also flexibly configure the symbols mapped by DMRS, as well as the number of mapped symbols. Due to the flexible configuration of the time-frequency resources and / or DMRS of PDSCH, it is often difficult to align the time-frequency resources allocated by PDSCH or the time-frequency resources allocated by DMRS. When the time-frequency resources allocated by data or the time-frequency resources allocated by DMRS are not aligned, the interference measurement result obtained by the terminal device through DMRS is not the real interference actually experienced by the data channel.

[0227] Figure 3 is a schematic diagram of DMRS-based interference measurement. Figure 3 primarily uses the time-frequency resources allocated by DMRS and the time-frequency resources allocated to the data channel between cell 1 (cell 1) and cell 2 (cell 2) as an example. Assume that the target cell is cell 1, which is configured with a two-symbol Type 2 DMRS. The DMRS starts at symbol 1 in the scheduling slot, and the data mapping starts at symbol 3, occupying eight consecutive OFDM symbols. Regarding the interfering cell, cell 2 is configured with a two-symbol Type 2 DMRS. The DMRS starts at symbol 3 in the scheduling slot, and the data mapping starts at symbol 5, occupying six consecutive OFDM symbols. Because the data (e.g., PDSCH) and the OFDM symbols mapped by DMRS corresponding to cell 1 and cell 2 are not aligned, it can be seen that cell 1 cannot estimate the interference signal from cell 2 when performing interference estimation based on DMRS, while cell 1's data channel is interfered with by cell 2. Figure 3 shows that the interference measurement results do not match the actual interference due to the misalignment of the time domain positions of DMRS or data signals in different cells, which seriously affects the detection performance of the receiving end.

[0228] Therefore, how to obtain true interference estimation results and improve the detection performance of the receiving end is an issue that needs to be considered at present.

[0229] In view of this, the present application provides a communication method and device, which configures zero-power interference measurement resources to a first communication device and does not send all or part of the data stream on some time-frequency resources mapped by the data, thereby obtaining a more accurate interference estimation result and improving the detection performance of the data stream at the receiving end.

[0230] To facilitate understanding of the embodiments of the present application, the following points are explained:

[0231] 1) In this application, unless otherwise specified or there is a logical conflict, the terms and / or descriptions between different embodiments are consistent and can be referenced by each other. The technical features in different embodiments can be combined to form new embodiments according to their inherent logical relationships.

[0232] 2) In this application, "at least one" means one or more, and "more" means two or more. "And / or" describes the association relationship of associated objects, indicating that three relationships may exist. For example, A and / or B can mean: A exists alone, A and B exist at the same time, and B exists alone, where A and B can be singular or plural. In the text description of this application, the character " / " generally indicates that the previous and next associated objects are in an "or" relationship. "At least one of the following items" or similar expressions refers to any combination of these items, including any combination of single items or plural items. For example, at least one of a, b and c can mean: a, or b, or c, or a and b, or a and c, or b and c, or a, b and c. Where a, b and c can be single or multiple, respectively.

[0233] 3) Throughout this application, the terms "first," "second," and various numerical references are used for descriptive purposes only and are not intended to limit the scope of the embodiments of this application. For example, they are used to distinguish between different messages, rather than to describe a specific order or precedence. It should be understood that such references are interchangeable, where appropriate, to allow for the description of scenarios beyond the embodiments of this application.

[0234] 4) In this application, the terms "comprise" and "have" and any variations thereof are intended to cover non-exclusive inclusions. For example, a process, method, system, product or apparatus that includes a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such process, method, product or apparatus.

[0235] 5) In this application, "used to indicate" can include being used for direct indication and being used for indirect indication. When describing that a certain indication information is used to indicate A, it can include that the indication information directly indicates A or indirectly indicates A, and it does not mean that the indication information must carry A.

[0236] 6) In this application, "protocol" may refer to a standard protocol in the field of communications, such as a 5G protocol, a new radio (NR) protocol, and related protocols used in future communication systems, and this application does not limit this. "Predefined" may include pre-definition, such as protocol definition. "Preconfiguration" may be implemented by pre-saving corresponding codes, tables, or other methods that can be used to indicate relevant information in the device, and this application does not limit its specific implementation method.

[0237] 7) In this application, configuration can be signaling configuration, and can also be described as configuration signaling. For example, signaling configuration includes configuration by signaling sent by the base station, and these signalings can be radio resource control (RRC) messages, downlink control information (DCI), or system information block (SIB). Optionally, the signaling configuration can also be configured to the terminal device by pre-configured signaling, or configured to the terminal device in a pre-configured manner. The pre-configuration here is to define or configure the values ​​of the corresponding parameters in advance in a protocol manner, and store them in the terminal device when communicating with the terminal device. The pre-configured message can be modified or updated under the condition that the terminal device is connected to the network.

[0238] 8) In this application, "communication" can be described as "data transmission", "information transmission", "data processing", etc., and "transmission" includes "sending" and "receiving".

[0239] 9) In this application, the index of the DMRS port or the index of the data stream may start from 0 or 1, or from other numbers, which is not limited in this application.

[0240] 10) The time unit involved in this application may be a time slot, a transmission time interval (TTI), a subframe, a symbol, or a mini-slot, etc. This application mainly uses OFDM symbols as the first time unit / second time unit to exemplarily introduce the technical solutions in this application. The OFDM symbols do not have any limiting effect on the time units involved in the embodiments of this application.

[0241] 11) The technical solution of the present application can be applied to DMRS or PTRS. It is understandable that with the development of communication technology, new signals with the same functions as DMRS may be defined in future communication systems, which are also applicable to the present application. For the sake of ease of understanding and explanation, the embodiment of the present application describes the technical solution by taking the reference signal as DMRS as an example, which should not constitute any limitation to the present application. The reference signal in the present application may be any reference signal that can be used for channel estimation, such as a channel sounding reference signal (SRS), CSI-RS, or other reference signals that can be used to achieve the same or similar functions. In communication systems that may appear in the future, the name of the reference signal may change, but as long as it is essentially the same as DMRS, the technical solution of the present application should be applicable.

[0242] The communication method provided by the embodiment of the present application will be described in detail below with reference to the accompanying drawings. The embodiment provided by the present application can be applied to any communication scenario in which a transmitting device and a receiving device communicate, such as the communication system shown in FIG1 above.

[0243] Figure 4 is a flow chart of a communication method 400 provided in an embodiment of the present application. As shown in Figure 4, the method can be performed by a first communication device and a second communication device, and includes the following steps, which are not exhaustive and can be referred to existing protocols.

[0244] 410. The second communication device determines the indication information.

[0245] It should be understood that the second communication device determines the indication information, and the indication information is used to indicate the at least one first resource set. The at least one first resource set is used for interference measurement. The second communication device is configured with a zero-power interference measurement resource set (e.g., at least one first resource set), and the resource units included in the zero-power interference measurement resource set are all within the time-frequency resource range of the data signal mapping of the data stream, that is, the resource units included in the at least one first resource set are not used to transmit part or all of the data stream, and the resource units included in the at least one first resource set can be referred to as zero-power interference measurement resource time-frequency resource positions.

[0246] The at least one first resource set includes at least one first resource, and the first resource is a resource unit included in the at least one first resource set. The second communication device does not transmit all or part of the data stream on the at least one first resource, but transmits the data stream on other resource units other than the at least one first resource within the time-frequency resources mapped to the data signal.

[0247] The partial data stream may be a corresponding data stream of a target terminal device (e.g., a first communication device), or may be a data stream corresponding to a plurality of terminal devices scheduled on a first resource. The plurality of terminal devices include all terminal devices scheduled on the first resource, or the plurality of terminal devices include one or more terminal devices scheduled on the first resource. The one or more terminal devices scheduled on the first resource include the first communication device, and may also include other communication devices within the cell where the first communication device is located. The entire data stream is used to indicate the data stream corresponding to all terminal devices within the cell where the first communication device is located.

[0248] As an example, as shown in Figure 5, within the time-frequency resource range mapped to the data stream, the second communication device may not transmit part or all of the data stream at some time-frequency resource positions according to predefined rules. As shown in Figure 5, the data is mapped to OFDM symbols 4 to OFDM symbols 13 in the time slot, wherein in symbol 4 and symbol 8, there are 4 resource units respectively, which are zero-power interference measurement resources corresponding to the cell (for example, cell 1). At the RE positions corresponding to the zero-power interference measurement resources, the cell does not send part or all of the data streams at the corresponding positions. The 4 resource units are not used to transmit part or all of the data streams, and the first communication device can obtain the actual inter-cell interference and / or intra-cell interference experienced by the data channel based on the 4 resource units. For different cells, the time-frequency resources corresponding to the first resources may be the same or different.

[0249] It should be understood that the data stream may be data scheduled by a terminal device (e.g., a first communication device), and the data stream may be data carried by a downlink data channel PDSCH or an uplink data channel PUSCH. On the first resource, a zero-power interference measurement resource is carried, such as not sending the data stream corresponding to the scheduled first communication device on the first resource; or, not sending any signal on the first resource.

[0250] The time-frequency resources mapped by the data stream refer to the time-frequency resources mapped to the uplink data channel or downlink data channel of the terminal device (e.g., the first communication device) indicated by the network device (e.g., the second communication device). For example, the second communication device may indicate the allocated time domain resources corresponding to the uplink data channel PUSCH or the downlink data channel PDSCH through indication information time domain resource assignment (TDRA), and the second communication device may indicate the allocated frequency domain resources corresponding to the uplink data channel (e.g., PUSCH) or the downlink data channel (e.g., PDSCH) through indication information frequency domain resource assignment (FDRA).

[0251] For example, if the network device uses frequency domain resource configuration type 1 to indicate the time-frequency resources mapped by the data stream, the indication information may specifically include the frequency domain starting position of the time-frequency resources mapped by the data stream and the continuous frequency domain bandwidth. The frequency domain starting position can be indicated by an offset relative to a predefined frequency domain reference position, and the continuous frequency domain bandwidth can be indicated by the number of frequency domain units (such as subbands, RBGs, RBs, etc.) contained in the continuous frequency domain bandwidth.

[0252] For another example, if a network device uses frequency domain resource configuration type 0 to indicate the time-frequency resources mapped to a data stream, the indication information may specifically be a bitmap consisting of multiple bits, with different bits used to indicate whether the corresponding frequency domain units are configured as resources within the time-frequency resources mapped to the data stream. For example, each bit may correspond to an RBG, and the indication information may use different bits to indicate whether the corresponding RBGs are configured as resources within the time-frequency resources mapped to the data stream.

[0253] It should be understood that when the network device schedules the terminal, it will also indicate / notify the terminal device of the time domain resource position of the time-frequency resource mapped to the corresponding data stream, that is, the time domain symbol corresponding to the time-frequency resource mapped to the data stream. The network device can indicate the starting time domain symbol and the corresponding time domain symbol length corresponding to the time-frequency resource mapped to the data stream through indication information, and the indication information is used to indicate the time domain unit corresponding to the time-frequency resource mapped to the data stream. Alternatively, the network device can configure one or more optional time domain resource parameters through the pusch-TimeDomainAllocationList field in the high-level signaling PUSCH-Config. The time domain resource parameter includes a parameter k0, which is used to indicate the slot offset between the DCI and the PDSCH / PUSCH scheduled by the DCI. When this field does not exist, the terminal device defaults to an offset of 0. The PUSCH-Config may also include a parameter startSymbolAndLength, which is used to indicate the starting symbol and length, also known as a start position and length indicator (SLIV).

[0254] 420. The second communication device sends instruction information to the first communication device.

[0255] Correspondingly, the first communication device receives the indication information from the second communication device.

[0256] 430. The first communications device determines a power scaling factor of a first reference signal.

[0257] The power scaling factor of the first reference signal is used to send the first reference signal. The first reference signal corresponds to a data stream, that is, one data stream among multiple data streams carried on the data channel corresponds to one reference signal port.

[0258] It should be understood that the power scaling factor is used for sending the first reference signal, which can be understood as multiplying the power scaling factor by the sent first reference signal sequence.

[0259] As an example, assuming that the first reference signal is DMRS, the power scaling factor of DMRS is The first communication device assumes that the transmitted DMRS sequence r(m) is multiplied by the power scaling factor Combining the above formula (6), the DMRS signal mapped to subcarrier k and symbol l is:

[0260] As another example, assuming that the first reference signal is PTRS, similar to the above DMRS, the power scaling factor of PTRS is The first communication device assumes that it sends a PTRS sequence r k Multiply by the power scaling factor The PTRS signal mapped to subcarrier k and symbol l is obtained as:

[0261] Optionally, the power scaling factor may also be used to determine the transmit power or amplitude of the first reference signal, or the power scaling factor may also be used by the receiving end to detect a data stream.

[0262] It should be understood that the power scaling factor may also be referred to as an amplitude scaling factor, a power factor, an amplitude factor, a power scaling coefficient, an amplitude scaling coefficient, a power coefficient, or an amplitude coefficient, etc. The power scaling factor may be used to reflect the amount of adjustment for adjusting the amplitude or power of a reference signal (e.g., a first reference signal). For example, adjusting the amplitude of the reference signal by a factor of k is equivalent to adjusting the power of the reference signal by a factor of k to the power of k. That is, the power scaling factor may also be the square of the amplitude scaling factor, or the amplitude scaling factor may also be the square root of the power scaling factor.

[0263] Optionally, the power scaling factor is related to an EPRE corresponding to the first reference signal and an EPRE corresponding to the data stream.

[0264] As an example, assuming that the first reference signal is DMRS, the power scaling factor of the DMRS can be determined based on the ratio of the EPRE of the data stream to the EPRE of the DMRS, or the power scaling factor of the DMRS can be determined based on the ratio of the EPRE of the DMRS to the EPRE of the data stream. In this application, the power scaling factor of the DMRS is described as an example based on the ratio of the EPRE of the data stream to the EPRE of the DMRS. Those skilled in the art can fully expand the calculation rules of the power scaling factors of other DMRSs based on the examples in this application, and this application does not elaborate on them one by one.

[0265] It should be understood that the first communication device determines the power scaling factor of the DMRS based on the ratio of the EPRE of the data stream to the EPRE of the DMRS, wherein the ratio of the EPRE of the data stream to the EPRE of the DMRS is related to a first value and a second value, the first value being the ratio of the number of frequency domain resources included in the first time unit by the first resource set to the number of frequency domain resources included in the time-frequency resources mapped by the data stream in the first time unit. The first resource set is a resource set within a first bandwidth, the time-frequency resources mapped by the data stream are time-frequency resources within the first bandwidth, the time-frequency resources mapped by the data stream include at least one of the first resource set and a second resource set, the second resource set is the time-frequency resource mapped by the data stream for transmitting the data stream, and the second value is the number of DMRS code division multiplexing (CDM) groups that do not map the data stream.

[0266] Assuming that ρ represents a first value and γ represents a second value, the ratio of the EPRE of the data stream to the EPRE of the DMRS may satisfy:

[0267] or,

[0268] The first communication device determines the power scaling factor of the DMRS according to the ratio of the EPRE of the data stream to the EPRE of the DMRS. The power scaling factor of the DMRS can be expressed as

[0269] when Should Can satisfy

[0270] when Should Can satisfy

[0271] It should be understood that the first value ρ in the embodiment of the present application can also be used to represent the ratio of the number of all frequency domain resources included in the first resource set in the first time unit to the number of all frequency domain resources included in the time-frequency resources mapped by the data stream in the first time unit, or the first value ρ can also be used to represent the ratio of the number of all frequency domain resources included in the first resource set in the first time unit to the number of time domain resources included in the time domain resources mapped by the data stream in the first time unit, and the ratio of the number of frequency domain resources included in each time domain resource mapped by the time-frequency resources to the data stream in the first time unit.

[0272] It should be understood that the first value p in the embodiment of the present application may also be the ratio of the sum of the number of frequency domain resources included in each time domain resource included in the first resource set in the first time unit to the sum of the number of frequency domain resources included in each time domain resource mapped to the data stream in the first time unit. The first value p in the embodiment of the present application may also be the ratio of the average number of frequency domain resources included in each time domain resource of the first resource set in the first time unit to the number of frequency domain resources included in the time-frequency resources mapped to the data stream in the first time unit. The first value p in the embodiment of the present application may also be the ratio of the sum of the number of first resources included in the first time unit to the sum of the number of time-frequency resources included in the time-frequency resources mapped to the data stream in the first time unit. The first value p in the embodiment of the present application may also be the ratio of the average number of first resources included in each time domain resource of the first resource set in the first time unit to the number of frequency domain resources included in the time-frequency resources mapped to the data stream in the first time unit. The first resource set is a resource set within a first bandwidth, and the time-frequency resources mapped to the data stream are time-frequency resources within the first bandwidth.

[0273] For example, as shown in Figure 5, assuming that the first bandwidth is 12 frequency domain subcarriers and the first time unit is OFDM symbol 4, the first value ρ is the ratio of the number of first resources included in the first resource set on symbol 4, 2, to the number of frequency domain resources included in the time-frequency resources mapped by the data stream on symbol 4, 12: 2 / 12, that is, the first value ρ is 1 / 6; assuming that the first time unit is OFDM symbol 4 to OFDM symbol 5, the first value ρ is the total number of first resources of the first resource set on symbols 4 and 5, 2, to the total number of frequency domain resources included in the time-frequency resources mapped by the data stream on symbols 4 and 5, 24: 2 / 24, that is, the first value ρ is 1 / 12, or the first value ρ is the average number of first resources included in each symbol of the first resource set on symbols 4 and 5, which is 2 / 2=1, which is The ratio of the number of frequency domain resources mapped by the time-frequency resources of the data stream on symbols 4 and 5, which is 12, on average, is: (2 / 2) / 12, that is, the first value ρ is 1 / 12; assuming that the first time unit is OFDM symbol 4 to OFDM symbol 8, then the first value ρ is the ratio of the total number of first resources included in the first resource set on symbols 4 to 8, which is 4, to the number of frequency domain resources mapped by the time-frequency resources of the data stream on symbols 4 to 8, which is 60, which is: 4 / 60, that is, the first value ρ is 1 / 15, or the first value ρ is the ratio of the average number of first resources included in each symbol of the first resource set on symbols 4 to 8, which is 4 / 5, to the average number of frequency domain resources included by the time-frequency resources mapped by the data stream, which is 12, which is: (4 / 5) / 12, that is, the first value ρ is 1 / 15.

[0274] It should also be understood that the ratio of the EPRE of the above data stream to the EPRE of the DMRS is a linear value (eg ), the calculated DMRS power scaling factor is also a linear value. At this time, those skilled in the art can convert the linear value of the DMRS power scaling factor into a dB value, for example, When converted to dB value, the transformation is: The ratio of the EPRE of the above data stream to the EPRE of the DMRS is a dB value (for example When the calculated DMRS power scaling factor is also a dB value, those skilled in the art can convert the dB value of the DMRS power scaling factor into a linear value, for example, When converted to linear values, the transformation is The linear conversion of the power scaling factors of other reference signals is similar to this example.

[0275] As another example, assuming that the first reference signal is PTRS, the power scaling factor of the PTRS can be determined based on the ratio of the EPRE of the PTRS to the EPRE of the data stream, or the power scaling factor of the PTRS can be determined based on the ratio of the EPRE of the data stream to the EPRE of the PTRS. In this application, the power scaling factor of the PTRS is determined based on the ratio of the EPRE of the PTRS to the EPRE of the data stream as an example for illustrative introduction. Those skilled in the art can fully expand the calculation rules of the power scaling factors of other PTRSs based on the examples in this application, and this application will not elaborate on them one by one.

[0276] It should be understood that the first communication device determines the power scaling factor of the PTRS based on the ratio of the EPRE of the PTRS to the EPRE of the data stream, wherein the ratio of the EPRE of the PTRS to the EPRE of the data stream is related to a first value and a third value, the first value being the ratio of the number of frequency domain resources included in the first resource set in the first time unit to the number of frequency domain resources included in the time-frequency resources mapped by the data stream in the first time unit, the first resource set being a resource set within the first bandwidth, the time-frequency resources mapped by the data stream being the time-frequency resources within the first bandwidth, the time-frequency resources mapped by the data stream including at least one of the first resource set and a second resource set, the second resource set being the time-frequency resources mapped by the data stream for transmitting the data stream, and the third value being the number of layers of the data stream.

[0277] Assuming that ρ represents the first value and L represents the third value, the ratio of the EPRE of the PTRS to the EPRE of the data stream may satisfy:

[0278] β PTRS =(1-ρ)L, or, β PTRS =10log 10 (1-ρ)L

[0279] The first communication device determines the power scaling factor of the PTRS according to the ratio of the EPRE of the PTRS to the EPRE of the data stream. The power scaling factor of the PTRS can be expressed as

[0280] When β PTRS =(1-ρ)L, the satisfy:

[0281] When β PTRS =10log 10 (1-ρ)L, the satisfy

[0282] It should be understood that the first value ρ is similar to that introduced in the above DMRS and will not be repeated here.

[0283] It should be understood that the above example simply introduces the possible calculation methods of the power scaling factor of DMRS and the power scaling factor of PTRS. For specific and detailed explanations, please refer to the detailed introduction in the following example 1, which will not be repeated here.

[0284] In one possible implementation, at least one of the first resource sets includes M third resource sets in a second time unit, each of the M third resource sets includes m third resources, the time domain resources of the m third resources are the second time unit, and the m third resources correspond one-to-one to the ports of the m reference signals, or the m third resources correspond one-to-one to the m first indexes, where M and m are both integers greater than or equal to 1.

[0285] It should be understood that the at least one first resource set is a zero-power interference measurement resource included in the time-frequency resource mapped to the data stream. In the same time unit (for example, the second time unit), M third resource sets may be included, and the M third resource sets include at least one third resource. The time domain resources of the at least one third resource are all the second time unit. That is, in one time unit, there may be M groups of zero-power interference measurement resource sets, each of which may include m resources (for example, third resources), and the m third resources correspond one-to-one to the ports of m reference signals, or, considering MU-MIMO transmission, the m third resources correspond one-to-one to m first indexes (for example, MU-MIMO user indexes).

[0286] Optionally, when the first reference signal is a DMRS, the value of m is related to the type of the DMRS. For example, if the DMRS type is Type 1 DMRS, the value of m is 8; if the DMRS type is Type 2 DMRS, the value of m is 12. m is the maximum value of a multi-user multiple-input multiple-output communication device supported by the second communication device, or the value of m is related to the type of the DMRS.

[0287] As an example, assuming that the first reference signal is DMRS, the power scaling factor of the DMRS can be determined based on the ratio of the EPRE of the data stream to the EPRE of the DMRS, or the power scaling factor of the DMRS can be determined based on the ratio of the EPRE of the DMRS to the EPRE of the data stream. Among them, the power scaling factor of the DMRS in this application is exemplarily introduced by taking the determination based on the ratio of the EPRE of the data stream to the EPRE of the DMRS as an example. Those skilled in the art can fully expand the calculation rules of the power scaling factors of other DMRSs based on the examples in this application, and this application will not introduce them one by one again.

[0288] It should be understood that the first communication device determines the power scaling factor of the DMRS based on the ratio of the EPRE of the data stream to the EPRE of the DMRS, wherein the ratio of the EPRE of the data stream to the EPRE of the DMRS is related to the fourth value and the second value, the M third resource sets are time-frequency resources within the second bandwidth, the fourth value is the total number of frequency domain resources (e.g., subcarriers) included in the time-frequency resource unit mapped to the data stream within the second bandwidth, and the second value is the number of DMRS code division multiplexing CDM groups that do not map the data stream.

[0289] Assuming that R represents the fourth value and γ represents the second value, the ratio of the EPRE of the data stream to the EPRE of the DMRS can satisfy:

[0290] or,

[0291] The first communication device determines the power scaling factor of the DMRS according to the ratio of the EPRE of the data stream to the EPRE of the DMRS. The power scaling factor of the DMRS can be expressed as

[0292] when satisfy

[0293] when Should satisfy

[0294] As another example, assuming that the first reference signal is PTRS, the power scaling factor of the PTRS can be determined based on the ratio of the EPRE of the PTRS to the EPRE of the data stream, or the power scaling factor of the PTRS can be determined based on the ratio of the EPRE of the data stream to the EPRE of the PTRS. In this application, the power scaling factor of the PTRS is determined based on the ratio of the EPRE of the PTRS to the EPRE of the data stream as an example for exemplary introduction. Those skilled in the art can fully expand the calculation rules of the power scaling factors of other PTRS based on the examples in this application, and this application will not introduce them one by one again.

[0295] It should be understood that the first communication device determines the power scaling factor of the PTRS based on the ratio of the EPRE of the PTRS to the EPRE of the data stream, wherein the ratio of the EPRE of the PTRS to the EPRE of the data stream is related to the fourth value and the third value, the M third resource sets are time-frequency resources within the second bandwidth, the fourth value is the total number of frequency domain resources included in the time-frequency resource units mapped to the data stream within the second bandwidth, and the third value is the number of layers of the data stream associated with the PTRS.

[0296] Assuming that R represents the fourth value and L represents the third value, the ratio of the EPRE of the PTRS to the EPRE of the data stream can satisfy or,

[0297] The first communication device determines the power scaling factor of the PTRS according to the ratio of the EPRE of the PTRS to the EPRE of the data stream. The power scaling factor of the PTRS can be expressed as

[0298] when satisfy

[0299] when Should satisfy

[0300] It should be understood that the above example simply introduces the possible calculation methods of the power scaling factor of DMRS and the power scaling factor of PTRS. For specific and detailed explanations, please refer to the detailed introduction in the following example 2, which will not be repeated here.

[0301] According to the method shown in Figure 4, the second communication device determines indication information and sends the indication information to the first communication device, the indication information is used to indicate at least one first resource set, and the resources in the at least one first resource set are resources in the time-frequency resources mapped by the data stream that are not used to transmit the data stream. The resources in the at least one first resource set are not used to transmit the data stream, that is, the receiving end can obtain real interference data based on the resources in the at least one first resource set. Among them, the data stream corresponds to the first reference signal, and the first communication device determines the power scaling factor of the first reference signal, and the power scaling factor is used by the receiving end to detect the data stream. In the case that there are resources in the time-frequency resources mapped by the data stream that are not used to transmit the data stream, the first communication device determines the power scaling factor of the reference signal corresponding to the data stream, and the power scaling factor of the reference signal is used for the receiving end to detect the data stream, thereby improving the detection performance of the data stream by the receiving end.

[0302] It should be noted that the receiving end in this application can be either the first communication device or the second communication device. When the data flow is an uplink data flow, the second communication device can serve as the receiving end; when the data flow is a downlink data flow, the first communication device can serve as the receiving end. This application does not specifically limit whether the data flow is an uplink data flow or a downlink data flow.

[0303] Among them, when the data stream is downlink data, the data can be PDSCH or PDCCH, etc., and when the data stream is uplink data, the data can be PUSCH or PUCCH, etc. This application mainly takes the data stream as PDSCH as an example to exemplify the method shown in Figure 4 above. Other transmitted data streams are applicable to the method provided by this application, and this application will not elaborate on them one by one.

[0304] The following will combine the method shown in Figure 4 above, taking PDSCH as an example of the data stream, and DMRS and PTRS as examples of the first reference signal, to exemplify the situation where there are resources in the time-frequency resources mapped by the data stream that are not used to transmit the data stream, ensuring the performance of the receiving end in detecting the data stream.

[0305] Example 1

[0306] The second communication device determines indication information and sends the indication information to the first communication device, where the indication information is used to indicate that a zero-power interference measurement resource set (e.g., at least one first resource set) is configured. On the resource elements (e.g., first resources) included in the at least one first resource set, all communication devices in the cell where the second communication device is located do not transmit data on the first resources. All communication devices in the cell do not transmit data on the first resources, that is, the first communication device can obtain inter-cell interference measurement results on the first resources, and the interference measurement results are the actual interference between the cells.

[0307] As an example, the time-frequency resources for data mapping configured by the second communication device are those mapped to the PDSCH, and the first reference signal is DMRS. Assume that the second communication device configures the PDSCH time-frequency resource mapping and the time-frequency resource mapping corresponding to the DMRS, as shown in Figure 6. For time domain resource allocation, the second communication device configures two Type 1 DMRS symbols, which are mapped to the OFDM symbols corresponding to OFDM symbol indices 2 and 3 within the PDSCH scheduling slot. The data PDSCH is mapped to the OFDM symbols corresponding to OFDM symbol indices 4 to 13. The frequency domain resource locations for the DMRS mapping are the same as the frequency domain resource locations for the data PDSCH mapping. In Figure 6, taking the 12 subcarriers corresponding to one RB as an example, the time-frequency resource element set mapped to the PDSCH includes 10 OFDM symbols in the time domain (OFDM symbols corresponding to OFDM symbol indices 4 to 13) and 12 subcarriers in the frequency domain. Multiple first resources are mapped within the time-frequency resource element set mapped to the PDSCH. There are two first resources on each of the four OFDM symbols corresponding to OFDM symbol indices 5, 7, 9, and 11. For OFDM symbols 5 and 9, the first resources are mapped to subcarriers 0 and 6, respectively. For OFDM symbols 7 and 11, the first resources are mapped to subcarriers 3 and 9, respectively.

[0308] For an OFDM symbol, the density of the first resource (or called the zero-power interference measurement resource frequency domain density) satisfies:

[0309] Among them, N ZP Indicates the number of frequency domain units corresponding to the zero-power interference measurement resources contained in the OFDM symbol within the first bandwidth, N PDSCH Indicates the total number of frequency domain units allocated to the PDSCH in the OFDM symbol within the first bandwidth. Taking Figure 6 as an example, assume that the frequency domain range of subcarrier 0 to subcarrier 11 is the first bandwidth. For OFDM symbol 5, N ZP =2, N PDSCH =12, so

[0310] The second communication device determines the energy per resource element (EPRE) corresponding to the downlink transmission through downlink power allocation. For the transmission of the downlink data channel PDSCH, the first communication device determines the ratio β of the EPRE of the PDSCH to the EPRE of the DMRS. DMRS Taking dB value as an example, as shown in formula (7):

[0311] Where ρ represents the frequency domain density of zero power interference measurement resources, and γ represents the number of DMRS CDM groups that do not map data. For different values ​​of ρ and γ, β DMRS The calculated values ​​are shown in Table 3. Accordingly, the power scaling factor of DMRS is It can be expressed as

[0312] Table 3 Ratio of PDSCH EPRE to DMRS EPRE (dB)

[0313] Based on Table 3, it can be seen that the ratio of PDSCH EPRE to DMRS EPRE β DMRSRelated to the number of DMRS CDM groups γ that do not map data and the frequency domain density ρ of zero-power interference measurement resources. When the second communication device does not determine the zero-power interference measurement resource, that is, the zero-power interference measurement resource density ρ=0, the ratio of the EPRE of the PDSCH to the EPRE of the DMRS is smaller than the ratio of the EPRE of the PDSCH to the EPRE of the DMRS determined when the second communication device determines the zero-power interference measurement resource. Therefore, when ρ=0, the deviation of the power scaling factor of the DMRS determined according to the ratio of the EPRE of the PDSCH to the EPRE of the DMRS is large, and an accurate interference measurement result cannot be obtained, that is, the deviation between the power of the DMRS determined by the first communication device and the power of the PDSCH is inaccurate, resulting in a decrease in the performance of the receiving end in detecting the data stream through the power scaling factor of the DMRS. The second communication device in this application determines the zero-power interference measurement resource, that is, the zero-power interference measurement resource density ρ≠0, for example ρ=1 / 6; ρ=1 / 4. On this zero-power interference measurement resource, the first communication device can obtain more accurate inter-cell interference measurement results, so that the determined power scaling factor of the DMRS is more accurate, and the performance of the receiving end in detecting the data stream based on the power scaling factor of the DMRS is improved.

[0314] As another example, the time-frequency resources for data mapping configured by the second communication device take the time-frequency resources for PDSCH mapping as an example, and the first reference signal takes PTRS as an example. The second communication device configures PDSCH time-frequency resource mapping and the time-frequency resource mapping corresponding to PTRS, which are similar to the DMRS in the above example and will not be repeated here.

[0315] It should be understood that when the second communication device performs PDSCH transmission, it also configures PTRS transmission. Since PTRS only sends signals for one or two ports, there is a difference between the EPRE corresponding to the PTRS and the EPRE corresponding to the data channel PDSCH. For example, the second communication device can configure the ratio β of the EPRE of the PT-RS corresponding to each port, each RE and each stream to the EPRE of the PDSCH for the first communication device through high-level signaling (such as epre-Ratio) PTRS , for example, taking formula (8) as an example:

[0316] β PTRS =10log 10 (1-ρ)L (8)

[0317] Where ρ represents the frequency domain density of zero power interference measurement resources, and L represents the number of PDSCH data streams associated with the PTRS port. For different values ​​of ρ and L, β PTRSThe calculated values ​​are shown in Table 4. Accordingly, the power scaling factor of PTRS is Can satisfy

[0318] Table 4 Ratio of PTRS EPRE to PDSCH EPRE for each RE and each stream (dB)

[0319] Based on the above Table 4, it can be seen that the ratio of the EPRE of PTRS to the EPRE of PDSCH corresponding to each RE and each flow of each port is β PTRS It is related to the number of data streams associated with a PTRS port and the frequency domain density of the zero power interference measurement resource. PTRS Further combining the above Get the power scaling factor of PTRS.

[0320] As described in Example 1 above, the indication information of the second communication device is used to indicate at least one first resource set. On the resource units (e.g., first resources) included in the at least one first resource set, all communication devices within the cell where the second communication device is located do not transmit data on the first resource. All communication devices within the cell where the second communication device is located do not transmit data on the first resource, meaning that the inter-cell interference measurement result obtained by the first communication device on the first resource is the actual inter-cell interference. This can further improve the detection performance of the data stream at the receiving end.

[0321] Example 2

[0322] The second communication device determines indication information and sends the indication information to the first communication device. The indication information is used to indicate that zero-power interference measurement resources (e.g., at least one first resource set) are configured. For the resource units (e.g., first resources) included in the at least one first resource set, all communication devices in the cell where the second communication device is located do not transmit data on the first resources. That is, all communication devices in the cell do not transmit data on the first resources, and the receiving end can obtain inter-cell interference measurement results on the first resources. The interference measurement results are the actual interference between the cells.

[0323] In one possible implementation, the time-frequency resource unit set of data mapping may include one or more time units (e.g., OFDM symbols) including zero-power interference measurement resources. Assuming that on the same time unit (e.g., the second time unit), there are M sets of candidate frequency domain resource unit sets for zero-power interference measurement resource mapping, and each of the M candidate frequency domain resource unit sets for zero-power interference measurement resource mapping may include N DMRScandidate frequency domain resource units for zero-power interference measurement resource mapping, where N DMRS The value of can be the maximum number of DMRS ports that can be supported. Each candidate frequency domain resource unit is associated with N DMRS The candidate frequency domain resource unit is associated with one of the N DMRS ports. DMRS The index of one of the DMRS ports is associated with the DMRS port.

[0324] As an example, the time-frequency resources of the data mapping configured by the second communication device are the time-frequency resources mapped by PDSCH, and the first reference signal is DMRS. Assume that the second communication device configures the time-frequency resource mapping of PDSCH and the time-frequency resource mapping corresponding to DMRS, as shown in 7. For time domain resource allocation, the second communication device is configured with 2-symbol Type 1 DMRS, with a maximum support of N DMRS =8 DMRS ports, mapped correspondingly in the OFDM symbols corresponding to OFDM symbol indices 2 and 3 in the PDSCH scheduling time slot. The data PDSCH is mapped in the OFDM symbols corresponding to OFDM symbol indices 4 to 13. The frequency domain resource position of the DMRS mapping is the same as the frequency domain resource position of the data PDSCH mapping. The frequency domain resources mapped by the DMRS and the frequency domain resources mapped by the PDSCH are both within the first bandwidth (for example, subcarrier 0 to subcarrier 11). In Figure 7, taking the 12 subcarriers corresponding to one RB as an example, the time-frequency resource unit set mapped by the PDSCH contains 10 OFDM symbols in the time domain (OFDM symbols corresponding to OFDM symbol indices 4 to 13) and 12 subcarriers in the frequency domain. In the time-frequency resource element set mapped to the PDSCH, on each of the two OFDM symbols corresponding to OFDM symbol indices 5 and 9, there are M=1 sets of candidate frequency domain resource element sets for zero-power interference measurement resource mapping, wherein each set of candidate frequency domain resource element sets for zero-power interference measurement resource mapping includes 8 zero-power interference measurement resource elements, corresponding to subcarriers 0 / 1 / 3 / 4 / 6 / 7 / 9 / 10, respectively. Each of the 8 zero-power interference measurement resources RE is respectively associated with N DMRS = associated with one of the 8 DMRS ports. As shown in Figure 7, for OFDM symbol 5, the zero-power interference measurement resource RE corresponding to subcarrier 0 is associated with DMRS port 0, the zero-power interference measurement resource RE corresponding to subcarrier 1 is associated with DMRS port 1, the zero-power interference measurement resource RE corresponding to subcarrier 3 is associated with DMRS port 4, and so on.

[0325] The second communication device sends indication information to the first communication device, and the indication information can be used to indicate at least one first resource set, and the first resource included in the at least one resource set is associated with the DMRS port index combination corresponding to the first communication device. The DMRS port index combination includes R DMRS ports, each DMRS port corresponds to a data stream of the first communication device, and R represents the number of data streams corresponding to the terminal device (also known as rank). The first communication device can select a DMRS port index (for example, select the DMRS port with the smallest value, or select the DMRS port with the largest value) associated with the zero power interference measurement resource RE in the DMRS port index allocated by the second communication device according to the first rule, and does not send the data signal of the data stream corresponding to the first communication device. For example, the second communication device schedules 6 communication devices for MU-MIMO transmission (for example, UE0 to UE5) on the current PDSCH, and the DMRS port index combinations allocated by the second communication device to UE0 to UE5 are {0}, {1}, {2,3}, {4,5}, {6} and {7}. According to the association relationship between the zero-power interference measurement resource RE and the DMRS port, UE0 does not send the 0-stream data flow signal corresponding to UE0 on the zero-power interference measurement resource RE associated with DMRS port 0. Similarly, UE1 does not send the 1-stream data flow signal corresponding to UE1 on the zero-power interference measurement resource RE associated with DMRS port 1. UE2 does not send the 2-stream data signal corresponding to UE2 on the zero-power interference measurement resource RE associated with DMRS port 2. UE3 does not send the 2-stream data signal corresponding to UE3 on the zero-power interference measurement resource RE associated with DMRS port 3. It can be seen that within an OFDM symbol carrying zero-power interference measurement resources, the total number of time-frequency resource units that are not used for transmission of data streams can be MV, where V is the total number of data streams.

[0326] In another possible implementation, the time-frequency resource unit set of data mapping may include one or more time units (e.g., OFDM symbols) including zero-power interference measurement resources. Assuming that on the same time unit (e.g., the second time unit), there are M sets of candidate frequency domain resource unit sets for zero-power interference measurement resource mapping, and each of the M candidate frequency domain resource unit sets for zero-power interference measurement resource mapping may include N UE candidate frequency domain resource units for zero-power interference measurement resource mapping, where N UE is the maximum number of MU-MIMO user equipment that can be supported. Each candidate frequency domain resource unit is associated with N UEEach candidate frequency domain resource unit is associated with N MU-MIMO user indices, or each candidate frequency domain resource unit can be associated with other index forms, such as the first resource index, the interference measurement resource port index, or the interference measurement resource index. DMRS The maximum number of MU-MIMO user equipment that can be supported is N. UE It may be related to the DMRS type. For example, for DMRS type 1, a maximum of 8 MU-MIMO users can be supported, that is, N UE =8, for DMRS type 2, a maximum of 12 MU-MIMO users can be supported, that is, N UE =12.

[0327] As an example, the time-frequency resources of the data mapping configured by the second communication device are the time-frequency resources mapped by PDSCH, and the first reference signal is DMRS. Assume that the second communication device configures the time-frequency resource mapping of PDSCH and the time-frequency resource mapping corresponding to DMRS, as shown in Figure 8. For time domain resource allocation, the second communication device is configured with 2-symbol Type 1 DMRS, with a maximum support of N DMRS =8 DMRS ports, mapped correspondingly in the OFDM symbols corresponding to OFDM symbol indices 2 and 3 in the PDSCH scheduling time slot. The data PDSCH is mapped in the OFDM symbols corresponding to OFDM symbol indices 4 to 13. The frequency domain resource position of the DMRS mapping is the same as the frequency domain resource position of the data PDSCH mapping, and the frequency domain resources mapped by the DMRS and the frequency domain resources mapped by the PDSCH are both within the first bandwidth (for example, subcarrier 0 to subcarrier 11). In Figure 8, taking the 12 subcarriers corresponding to one RB as an example, the time-frequency resource unit set mapped by the PDSCH contains 10 OFDM symbols in the time domain (OFDM symbols corresponding to OFDM symbol indices 4 to 13) and 12 subcarriers in the frequency domain. In the time-frequency resource element set mapped by PDSCH, on each OFDM symbol of the two OFDM symbols corresponding to OFDM symbol indices 5 and 9, there are M=1 sets of candidate frequency domain resource element sets for zero-power interference measurement resource mapping, wherein each set of candidate frequency domain resource element sets for zero-power interference measurement resource mapping contains 8 zero-power interference measurement resource elements, corresponding to subcarriers 0 / 1 / 3 / 4 / 6 / 7 / 9 / 10 respectively. Each of the 8 zero-power interference measurement resources RE is associated with a MU-MIMO user index (e.g., the first index). As shown in Figure 8, for OFDM symbol 5, the zero-power interference measurement resource RE corresponding to subcarrier 0 is associated with MU-MIMO user index 0, the zero-power interference measurement resource RE corresponding to subcarrier 1 is associated with MU-MIMO user index 4, the zero-power interference measurement resource RE corresponding to subcarrier 3 is associated with MU-MIMO user index 2, and so on.

[0328] The second communication device sends indication information to the first communication device, and the indication information can be used to indicate at least one first resource set, and the first resource included in the at least one resource set corresponds to the MU-MIMO user index. The first communication device does not send the data stream signal corresponding to the first communication device on the first resource associated with the configured MU-MIMO user index. For example, the second communication device schedules 6 first communication devices for MU-MIMO transmission (for example, UE0 to UE5) on the current PDSCH, corresponding to MU-MIMO user indices 0 to 5 respectively. According to the association relationship between the first resource and the DMRS port, UE0 to UE5 do not send the data stream signal corresponding to UE0 on the zero-power interference measurement resource RE associated with MU-MIMO user index 0; UE1 does not send the data stream signal corresponding to UE0 on the zero-power interference measurement resource RE associated with MU-MIMO user index 1; UE2 does not send the data stream signal corresponding to UE0 on the zero-power interference measurement resource RE associated with MU-MIMO user index 2, and so on. Assume that UE K does not send the data stream signal corresponding to UE K on the zero-power interference measurement resource RE associated with MU-MIMO user index K. It can be seen that within an OFDM symbol carrying zero-power interference measurement resources, the total number of time-frequency resource units that are not used for transmitting data streams can be MV, where V is the total number of data streams.

[0329] Based on the indication information sent by the second communication device to the first communication device in the above-mentioned example 2, the indication information is used to indicate at least one first resource set, wherein the at least one first resource set includes M candidate frequency domain resource unit sets (e.g., M third resource sets) for zero-power interference measurement resource mapping on the same time domain resource (e.g., the second time unit), and each of the M third resource sets includes m candidate frequency domain resource units (e.g., third resources) for zero-power interference measurement resource mapping. The at least one first resource set includes at least one first resource, and the time domain resource in the at least one first resource is a resource unit of the second time unit, which can be referred to as a third resource, that is, the at least one first resource includes the m third resources. The m third resources correspond one-to-one to the ports of the m reference signals, or the m third resources correspond one-to-one to the m first indexes (e.g., MU-MIMO user index, or first resource index). Optionally, the value of m is related to the type of the reference signal (e.g., type1 DMRE, type2 DMRE), or the value of m is related to the maximum number of MU-MIMO supported by the second communication device.

[0330] Next, based on the specific meanings of M and m introduced in the above example 2, it will be introduced how the first network device determines the power scaling factor of the reference signal to ensure the detection performance of the data at the receiving end.

[0331] Assuming that the reference signal is a DMRS, the first communication device determines the power scaling factor of the DMRS based on the ratio of the EPRE of the data stream to the EPRE of the DMRS, wherein the ratio of the EPRE of the DMRS to the EPRE of the data stream can satisfy the following formula (9):

[0332] Among them, R can be used to represent the total number of subcarriers included in the time-frequency resource unit mapped by the data stream, and γ can be used to represent the number of CDM groups of DMRS that do not map the data stream. For different values ​​of M, N and γ, β DMRS The calculated values ​​are shown in Table 5. Accordingly, the power scaling factor of DMRS is Can satisfy

[0333] Table 5 Ratio of PDSCH EPRE to DMRS EPRE (dB)

[0334] Based on Table 5, it can be seen that the ratio of PDSCH EPRE to DMRS EPRE β DMRSIt is related to the number γ of DMRS CDM groups that do not map data, whether there are zero-power interference measurement resources, and the type of DMRS. Among them, when the second communication device has not determined the zero-power interference measurement resource, that is, when there is no zero-power interference measurement resource within the time-frequency resource range mapped by the data stream, the ratio of the EPRE of the PDSCH to the EPRE of the DMRS is smaller than the ratio of the EPRE of the PDSCH to the EPRE of the DMRS determined when the second communication device determines the zero-power interference measurement resource. Therefore, in the absence of zero-power interference measurement resources, the deviation of the power scaling factor of the DMRS determined according to the ratio of the EPRE of the PDSCH to the EPRE of the DMRS is large, and an accurate interference measurement result cannot be obtained, that is, the deviation between the power of the DMRS determined by the first communication device and the power of the PDSCH is inaccurate, resulting in a decrease in the performance of the receiving end in detecting the data stream through the power scaling factor of the DMRS. The second communication device in the present application indicates that there is a zero-power interference measurement resource within the time-frequency resource range mapped to the data stream, that is, on the zero-power interference measurement resource, the first communication device associated with the zero-power interference resource does not send the data stream of the first communication device, and other communication devices not associated with the resource unit continue to send data streams on the resource unit. The first communication device can obtain more accurate interference measurement results between and within cells, so that the power scaling factor of the determined DMRS is more accurate, and the performance of the receiving end in detecting the data stream based on the power scaling factor of the DMRS is improved.

[0335] Assuming that the reference signal is PTRS, the second communication device is configured with the transmission resources corresponding to PTRS. Since PTRS may send signals for one port or two ports, the second communication device can configure the ratio β of the EPRE of PTRS to the EPRE of PDSCH corresponding to each port, each RE and each stream for the first communication device through high-layer signaling epre-Ratio PTRS Take formula (10) as an example:

[0336] Among them, R can be used to represent the total number of subcarriers included in the time-frequency resource unit mapped by the data stream, and L can be used to represent the total number of subcarriers included in the time-frequency resource unit mapped by the data stream. For different values ​​of M, N and L, The calculated values ​​are shown in Table 6. Accordingly, the power scaling factor of PTRS is Can satisfy

[0337] Table 6 Ratio of PTRS EPRE to PDSCH EPRE for each RE and each stream (dB)

[0338] Based on the above Table 6, it can be seen that the ratio β of the EPRE of PTRS to the EPRE of PDSCH corresponding to each RE of each port and each flow is PTRS It is related to the number of data streams associated with a PTRS port and the frequency domain density of the zero power interference measurement resource. PTRS Further combining the above Get the power scaling factor of PTRS.

[0339] Through the introduction of the above example 2, the indication information of the second communication device is used to indicate at least one first resource set, and the resource unit (for example, the first resource) included in the at least one first resource set only sends data streams of other communication devices except the communication device associated with the resource unit, so that the interference between cells and the interference within the cell can be obtained on the zero-power interference measurement resource. In this application, considering that the first communication device cannot know the information of other MU-MIMO paired user equipment in this cell (for example, the number of configured users, the data streams of paired users, etc.), the application presets the resource position and the DMRS port index in a time unit, or presets the resource position and the MU-MIMO user index in a time unit to ensure that the number of data streams not transmitted on the zero-power interference measurement resource in a time unit is an integer multiple of the number of transmitted data streams, thereby greatly simplifying the complexity of calculating the power scaling factor of the reference signal (DMRS / PTSR).

[0340] It should be understood that the second communication device can implicitly indicate the time-frequency resource position of each user equipment corresponding to the non-transmitted data stream and the behavior of not transmitting the data stream by indicating the DMRS port index or the MU-MIMO user index, thereby ensuring that the zero-power interference measurement resource position corresponding to each user equipment does not conflict, thereby ensuring that the inter-cell interference and intra-cell interference can be accurately measured at the reserved zero-power interference measurement resource position. At the same time, the power factor calculation result of the DMRS or PTRS can be obtained simply and efficiently.

[0341] It should also be understood that the number of data streams that are not transmitted on the zero-power interference measurement resource within a time unit is an integer multiple of the total number of transmitted data streams, so that in the MU-MIMO system, the first communication device does not need to know the information of other MU-MIMO configured users (for example, the number of configured users, paired user data streams, etc.), thereby ensuring the accuracy of the channel estimation by the first communication device and improving the detection performance of the data stream at the receiving end.

[0342] It should also be understood that in the above examples 1 and 2, the calculation examples of the power scaling factor of the reference signal (PTRS / DMRS) are all based on dB. In this application, the power scaling factor of the reference signal of the linear value can also be calculated. In this application, the power scaling factor of the dB value can be converted into a power scaling factor of the linear value, or the power scaling factor of the linear value can be converted into a power scaling factor of the dB value. The examples in this application do not limit this application in any way.

[0343] Figure 9 is a schematic block diagram of a communication device 1000 provided in an embodiment of the present application. As shown in Figure 9, the device 1000 may include a transceiver unit 1010 and a processing unit 1020. The transceiver unit 1010 can communicate with the outside world, and the processing unit 1020 is used for data processing. The transceiver unit 1010 may also be referred to as a communication interface or a transceiver unit. The processing unit 1020 may be used for processing.

[0344] Optionally, the device 1000 may further include a storage unit, which may be used to store instructions and / or data. The processing unit 1020 may read the instructions and / or data in the storage unit so that the device implements the aforementioned method embodiment.

[0345] Exemplarily, the communication device 1000 is a first communication device, which can be a terminal device, or a communication device applied to a terminal device or used in combination with a terminal device and capable of implementing a method executed by the terminal device, such as a chip, a chip system or a circuit. For details, please refer to the relevant description of the chip system shown in the figure below.

[0346] Exemplarily, the communication device 1000 is a second communication device, which can be a network device, or a communication device applied to a network device or used in combination with a network device and capable of implementing a method executed by the network device, such as a chip, a chip system or a circuit. For details, please refer to the relevant description of the chip system shown in the figure below.

[0347] In one possible design, the device 1000 can implement steps or processes corresponding to those performed by the first communication device in the above method embodiment, wherein the processing unit 1020 is used to perform processing-related operations of the first communication device in the above method embodiment, and the transceiver unit 1010 is used to perform transceiver-related operations of the first communication device in the above method embodiment.

[0348] Exemplarily, the transceiver unit 1010 is used to receive indication information from a second communication device, where the indication information is used to indicate at least one first resource set, where the first resource set is used by the first communication device to perform interference measurement, where the first resource set belongs to a time-frequency resource mapped to a data stream, where the data stream corresponds to a reference signal; the processing unit 1020 is used to determine a power scaling factor of the reference signal, where the power scaling factor is used to detect the data stream.

[0349] In another possible design, the device 1000 can implement steps or processes corresponding to those performed by the second communication device in the above method embodiment, wherein the transceiver unit 1010 is used to perform transceiver-related operations of the second communication device in the above method embodiment, and the processing unit 1020 is used to perform processing-related operations of the second communication device in the above method embodiment.

[0350] Exemplarily, the processing unit 1020 is used to determine indication information; the transceiver unit 1010 is used to send the indication information to the first communication device, the indication information is used to indicate at least one first resource set, the first resource set is used by the first communication device to perform interference measurement, the first resource set belongs to the time-frequency resource mapped by the data stream, the data stream corresponds to a reference signal, and the power scaling factor of the reference signal is used by the first communication device to detect the data stream.

[0351] It should be understood that the device 1000 here is embodied in the form of a functional unit. The term "unit" here may refer to an application specific integrated circuit (ASIC), an electronic circuit, a processor (such as a shared processor, a dedicated processor or a group processor, etc.) and a memory for executing one or more software or firmware programs, a merging logic circuit and / or other suitable components that support the described functions. In an optional example, those skilled in the art will understand that the device 1000 can be specifically the transmitting end in the above-mentioned embodiment, and can be used to execute the various processes and / or steps corresponding to the transmitting end in the above-mentioned method embodiment, or the device 1000 can be specifically the receiving end in the above-mentioned embodiment, and can be used to execute the various processes and / or steps corresponding to the receiving end in the above-mentioned method embodiment. To avoid repetition, it will not be described here.

[0352] The device 1000 of each of the above-mentioned solutions has the function of implementing the corresponding steps performed by the sending end in the above-mentioned method, or the device 1000 of each of the above-mentioned solutions has the function of implementing the corresponding steps performed by the receiving end in the above-mentioned method. The functions can be implemented by hardware, or the corresponding software can be implemented by hardware. The hardware or software includes one or more modules corresponding to the above-mentioned functions; for example, the transceiver unit can be replaced by a transceiver (for example, the sending unit in the transceiver unit can be replaced by a transmitter, and the receiving unit in the transceiver unit can be replaced by a receiver), and other units, such as the processing unit, can be replaced by a processor to respectively perform the transceiver operations and related processing operations in each method embodiment.

[0353] In addition, the above-mentioned transceiver unit can also be a transceiver circuit (for example, it can include a receiving circuit and a transmitting circuit), and the processing unit can be a processing circuit. In an embodiment of the present application, the above-mentioned communication device can be the receiving end or the transmitting end in the aforementioned embodiment, or it can be a chip or a chip system, such as a system on chip (SoC). Among them, the transceiver unit can be an input and output circuit or a communication interface. The processing unit is a processor or microprocessor or integrated circuit integrated on the chip. This is not limited here.

[0354] Figure 10 is a schematic block diagram of a communication device 2000 provided in an embodiment of the present application. As shown in Figure 10, the device 2000 includes a processor 2010 and a transceiver 2020. The processor 2010 and the transceiver 2020 communicate with each other via an internal connection path. The processor 2010 is configured to execute instructions to control the transceiver 2020 to transmit and / or receive signals.

[0355] Optionally, the apparatus 2000 may further include a memory 2030, which communicates with the processor 2010 and the transceiver 2020 via an internal connection path. The memory 2030 is used to store instructions, and the processor 2010 may execute the instructions stored in the memory 2030.

[0356] Exemplarily, the communication device 2000 is a first communication device, which can be a terminal device, or a communication device applied to a terminal device or used in combination with a terminal device and capable of implementing a method executed by the terminal device, such as a chip, a chip system or a circuit. For details, please refer to the relevant description of the chip system shown in Figure 11.

[0357] Exemplarily, the communication device 2000 is a second communication device, which can be a network device, or a communication device applied to a network device or used in combination with a network device and capable of implementing a method for executing a location management function network element, such as a chip, a chip system or a circuit. For details, please refer to the relevant description of the chip system shown in Figure 11.

[0358] In a possible implementation, the apparatus 2000 is used to implement various processes and steps corresponding to the first communication apparatus in the above method embodiment.

[0359] In another possible implementation, the apparatus 2000 is used to implement the various processes and steps corresponding to the second communication apparatus in the above method embodiment.

[0360] Optionally, the memory 2030 may include a read-only memory and a random access memory, and provide instructions and data to the processor. A portion of the memory may also include non-volatile random access memory. For example, the memory may also store device type information. The processor 2010 may be configured to execute instructions stored in the memory. When the processor 2010 executes the instructions stored in the memory, the processor 2010 is configured to perform the various steps and / or processes of the above-described method embodiments corresponding to the transmitting end or the receiving end.

[0361] During implementation, each step of the above method can be completed by an integrated logic circuit of the hardware in the processor or by instructions in the form of software. The steps of the method disclosed in conjunction with the embodiments of the present application can be directly embodied as being executed by a hardware processor, or can be executed by a combination of hardware and software modules in the processor. The software module can be located in a storage medium mature in the art such as a random access memory, a flash memory, a read-only memory, a programmable read-only memory or an electrically erasable programmable memory, a register, etc. The storage medium is located in the memory, and the processor reads the information in the memory and completes the steps of the above method in conjunction with its hardware. To avoid repetition, it will not be described in detail here.

[0362] It should be noted that the processor in the embodiments of the present application can be an integrated circuit chip with signal processing capabilities. During implementation, each step of the above-described method embodiments can be completed by hardware integrated logic circuits in the processor or by software instructions. The above-described processor can be a general-purpose processor, a digital signal processor, an application-specific integrated circuit, a field-programmable gate array or other programmable logic device, a discrete gate or transistor logic device, a discrete hardware component, or the aforementioned CPU, other general-purpose processors, a DSP, an ASIC, an FPGA or other programmable logic device, or a portion of the circuitry in other chips used for processing functions. The processor in the embodiments of the present application can implement or execute the various methods, steps, and logic block diagrams disclosed in the embodiments of the present application. The general-purpose processor can be a microprocessor or any conventional processor. The steps of the methods disclosed in the embodiments of the present application can be directly implemented and executed by a hardware decoding processor, or by a combination of hardware and software modules in the decoding processor. The software modules can be located in a storage medium well-known in the art, such as random access memory, flash memory, read-only memory, programmable read-only memory, electrically erasable programmable memory, registers, etc. The storage medium is located in a memory, and the processor reads information from the memory and, in conjunction with its hardware, completes the steps of the above-described method.

[0363] It is understood that the memory in the embodiments of the present application may be a volatile memory or a non-volatile memory, or may include both volatile and non-volatile memories. Among them, the non-volatile memory may be a read-only memory (ROM), a programmable read-only memory (PROM), an erasable programmable read-only memory (EPROM), an electrically erasable programmable read-only memory (EEPROM), or a flash memory. The volatile memory may be a random access memory (RAM), which is used as an external cache. By way of example and not limitation, many forms of RAM are available, such as static RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), double data rate SDRAM (DDR SDRAM), enhanced SDRAM (ESDRAM), synchronous link DRAM (SLDRAM), and direct RAM bus RAM (DR RAM). It should be noted that the memory of the systems and methods described herein is intended to include, but is not limited to, these and any other suitable types of memory.

[0364] In the embodiments of the present application, the above-described method may be performed by the first communication device and the second communication device, or may be performed by a chip, chip system, or circuit in the first communication device and the second communication device. The chip, chip system, or circuit may be installed in the first communication device and the second communication device. Below, the chip system in the first communication device and the second communication device is described in conjunction with FIG11.

[0365] FIG11 is a schematic block diagram of a chip system 3000 according to an embodiment of the present application. As shown in FIG11 , the chip system 3000 (or also referred to as a processing system) includes a logic circuit 3010 and an input / output interface 3020 .

[0366] Logic circuit 3010 may be a processing circuit in chip system 3000. Logic circuit 3010 may be coupled to a storage unit and call instructions in the storage unit, so that chip system 3000 can implement the methods and functions of various embodiments of the present application. Input / output interface 3020 may be an input / output circuit in chip system 3000, outputting information processed by chip system 3000 or inputting data or signaling information to be processed into chip system 3000 for processing.

[0367] As a solution, the chip system 3000 is used to implement the operations performed by the first communication device or the second communication device in the above various method embodiments.

[0368] For example, the logic circuit 3010 is used to implement the processing-related operations performed by the first communication device in the above method embodiments, such as the processing-related operations performed by the first communication device in the above embodiment; the input / output interface 3020 is used to implement the sending and / or receiving-related operations performed by the first communication device in the above method embodiments, such as the sending and / or receiving-related operations performed by the first communication device in the above embodiment.

[0369] For another example, the logic circuit 3010 is used to implement the processing-related operations performed by the second communication device in the above method embodiments, such as the processing-related operations performed by the second communication device in the above embodiment; the input / output interface 3020 is used to implement the sending and / or receiving-related operations performed by the second communication device in the above method embodiments, such as the sending and / or receiving-related operations performed by the second communication device in the above embodiment.

[0370] An embodiment of the present application further provides a computer-readable storage medium storing computer instructions for implementing the methods executed by the first communication device or the second communication device in the above-mentioned method embodiments.

[0371] An embodiment of the present application further provides a computer program product comprising instructions, which, when executed by a computer, implement the methods performed by the first communication device or the second communication device in the above-mentioned method embodiments.

[0372] An embodiment of the present application further provides a communication system, which includes the first communication device or the second communication device in each of the above embodiments.

[0373] The explanation of the relevant contents and beneficial effects of any of the above-mentioned devices can be referred to the corresponding method embodiments provided above, which will not be repeated here.

[0374] Those skilled in the art will appreciate that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professional and technical personnel can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of this application.

[0375] Those skilled in the art will clearly understand that, for the convenience and brevity of description, the specific working processes of the systems, devices and units described above can refer to the corresponding processes in the aforementioned method embodiments and will not be repeated here.

[0376] In the several embodiments provided in this application, it should be understood that the disclosed systems, devices and methods can be implemented in other ways. For example, the device embodiments described above are merely schematic. For example, the division of the units is merely a logical function division. In actual implementation, there may be other division methods, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of devices or units, which can be electrical, mechanical or other forms.

[0377] The units described as separate components may or may not be physically separate, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed across multiple network units. Some or all of these units may be selected to achieve the purpose of this embodiment according to actual needs.

[0378] In addition, each functional unit in each embodiment of the present application may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit.

[0379] If the functions are implemented in the form of software functional units and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present application, or the part that contributes to the prior art, or the part of the technical solution, can be embodied in the form of a software product. The computer software product is stored in a storage medium and includes several instructions for enabling a computer device (which can be a personal computer, server, or device, etc.) to execute all or part of the steps of the method described in each embodiment of the present application. The aforementioned storage medium includes various media that can store program codes, such as a USB flash drive, a mobile hard disk, a read-only memory, a random access memory, a magnetic disk, or an optical disk.

[0380] The above description is merely a specific embodiment of the present application, but the scope of protection of the present application is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in this application should be included in the scope of protection of this application. Therefore, the scope of protection of this application should be based on the scope of protection of the claims.

Claims

1. A communication method, characterized in that: Applied to a first communication device, the method comprises: receiving indication information from a second communication device, where the indication information is used to indicate at least one first resource set, where the first resource set is used by the first communication device to perform interference measurement, where the first resource set belongs to time-frequency resources mapped to a data stream, and where the data stream corresponds to a first reference signal; A power scaling factor of the first reference signal is determined, where the power scaling factor is used to send the first reference signal.

2. The method according to claim 1, characterized in that The power scaling factor is related to the power EPRE of each resource unit corresponding to the first reference signal and the power EPRE of each resource unit corresponding to the data stream.

3. The method according to claim 1 or 2, characterized in that: When the first reference signal is a DMRS, determining a power scaling factor of the first reference signal includes: The power scaling factor is related to the ratio of the EPRE of the data stream to the EPRE of the DMRS, and the power scaling factor is the power scaling factor of the DMRS, Among them, the ratio of the EPRE of the data stream to the EPRE of the DMRS is related to a first value and a second value, the first value is the ratio of the number of frequency domain resources included in the first resource set in the first time unit to the number of frequency domain resources included in the time-frequency resources mapped by the data stream in the first time unit, the first resource set is a resource set within a first bandwidth, the time-frequency resources mapped by the data stream are time-frequency resources within the first bandwidth, the time-frequency resources mapped by the data stream include at least one of the first resource set and the second resource set, the second resource set is the time-frequency resources mapped by the data stream for transmitting the data stream, and the second value is the number of DMRS code division multiplexing CDM groups that do not map the data stream.

4. The method according to claim 3, characterized in that The ratio of the EPRE of the data stream to the EPRE of the DMRS satisfies: or, Here, ρ represents the first value, and γ represents the second value.

5. The method according to claim 4, characterized in that When the ratio of the EPRE of the data stream to the EPRE of the DMRS satisfies: When , the power scaling factor of the DMRS satisfies: When the ratio of the EPRE of the data stream to the EPRE of the DMRS satisfies: When , the power scaling factor of the DMRS satisfies:

6. The method according to claim 1 or 2, characterized in that: When the first reference signal is a PTRS, determining a power scaling factor of the first reference signal includes: The power scaling factor is related to the ratio of the EPRE of the PTRS to the EPRE of the data stream, and the power scaling factor is the power scaling factor of the PTRS. Among them, the ratio of the EPRE of the PTRS to the EPRE of the data stream is related to a first value and a third value, the first value is the ratio of the number of frequency domain resources included in the first resource set in the first time unit to the number of frequency domain resources included in the time-frequency resources mapped by the data stream in the first time unit, the first resource set is a resource set within a first bandwidth, the time-frequency resources mapped by the data stream are time-frequency resources within the first bandwidth, the time-frequency resources mapped by the data stream include at least one of the first resource set and a second resource set, the second resource set is the time-frequency resources mapped by the data stream for transmitting the data stream, and the third value is the number of layers of the data stream.

7. The method according to claim 6, characterized in that The ratio of the EPRE of the PTRS to the EPRE of the data stream satisfies: β PTRS =(1-ρ)L, or, β PTRS =10log 10 (1-ρ)L Wherein, ρ represents the first value, and L represents the third value.

8. The method according to claim 7, characterized in that When the ratio of the EPRE of the PTRS to the EPRE of the data stream satisfies: β PTRS =(1-ρ)L, the power scaling factor of the PTRS satisfies: When the ratio of the EPRE of the PTRS to the EPRE of the data stream satisfies: β PTRS =10log 10 (1-ρ)L, the power scaling factor of the PTRS satisfies:

9. The method according to claim 1 or 2, characterized in that: At least one of the first resource sets includes M third resource sets in a second time unit, each of the M third resource sets includes m third resources, and the time domain resource of the m third resources is the second time unit, The m third resources correspond one-to-one to the ports of the m reference signals, or the m third resources correspond one-to-one to the m first indexes, Wherein, M and m are both integers greater than or equal to 1.

10. The method according to claim 9, characterized in that The indication information is further used to indicate a first port, or a second index, the m reference signal ports include the first port, and the m first indexes include the second index. The at least one first resource set includes at least one first resource, where the first resource is determined based on the m third resources and the first port, or the first resource is determined based on the m third resources and the second index.

11. The method according to claim 9 or 10, characterized in that: When the reference signal is a DMRS, the value of m is related to the type of the DMRS, or m is a maximum value of a multi-user multiple-input multiple-output communication device supported by the second communication device.

12. The method according to any one of claims 9 to 11, characterized in that When the first reference signal is a DMRS, determining a power scaling factor of the first reference signal includes: The power scaling factor is related to the ratio of the EPRE of the data stream to the EPRE of the DMRS, and the power scaling factor is the power scaling factor of the DMRS, Among them, the ratio of the EPRE of the data stream to the EPRE of the DMRS is related to the fourth value and the second value, the M third resource sets are time-frequency resources within the second bandwidth, the fourth value is the total number of frequency domain resources included in the time-frequency resource units mapped to the data stream within the second bandwidth, and the second value is the number of DMRS code division multiplexing CDM groups that do not map the data stream.

13. The method according to claim 12, characterized in that The ratio of the EPRE of the data stream to the EPRE of the DMRS satisfies: or, Wherein, R represents the fourth value, and γ represents the second value.

14. The method according to claim 13, characterized in that When the ratio of the EPRE of the data stream to the EPRE of the DMRS satisfies: When , the power scaling factor of the DMRS satisfies: When the ratio of the EPRE of the data stream to the EPRE of the DMRS satisfies: When , the power scaling factor of the DMRS satisfies:

15. The method according to any one of claims 9 to 11, characterized in that When the first reference signal is a PTRS, determining a power scaling factor of the first reference signal includes: The power scaling factor is related to the ratio of the EPRE of the PTRS to the EPRE of the data stream, and the power scaling factor is the power scaling factor of the PTRS. Among them, the ratio of the EPRE of the PTRS to the EPRE of the data stream is related to the fourth value and the third value, the fourth value is the total number of frequency domain resources included in the time-frequency resource unit mapped by the data stream within the second bandwidth, and the third value is the number of layers of the data stream.

16. The method according to claim 15, characterized in that The ratio of the EPRE of the PTRS to the EPRE of the data stream satisfies: or, Among them, R represents the fourth value, and L represents the third value.

17. The method according to claim 16, characterized in that When the ratio of the EPRE of the PTRS to the EPRE of the data stream satisfies: When , the power scaling factor of the PTRS satisfies: When the ratio of the EPRE of the PTRS to the EPRE of the data stream satisfies: When , the power scaling factor of the PTRS satisfies:

18. A communication method, characterized in that: Applied to a second communication device, the method comprises: Determine the instruction information; The indication information is sent to a first communication device, where the indication information is used to indicate at least one first resource set, where the first resource set is used by the first communication device to perform interference measurement, where the first resource set belongs to the time-frequency resources mapped by the data stream, where the data stream corresponds to a first reference signal, and where a power scaling factor of the first reference signal is used by the first communication device to detect the data stream.

19. The method according to claim 18, characterized in that The power scaling factor is related to the power EPRE of each resource unit corresponding to the first reference signal and the power EPRE of each resource unit corresponding to the data stream.

20. The method according to claim 18 or 19, characterized in that When the first reference signal is a demodulation reference signal DMRS, The power scaling factor is related to the ratio of the EPRE of the data stream to the EPRE of the DMRS, and the power scaling factor is the power scaling factor of the DMRS, Among them, the ratio of the EPRE of the data stream to the EPRE of the DMRS is related to a first value and a second value, the first value is the ratio of the number of frequency domain resources included in the first resource set in the first time unit to the number of frequency domain resources included in the time-frequency resources mapped by the data stream in the first time unit, the first resource set is a resource set within a first bandwidth, the time-frequency resources mapped by the data stream are time-frequency resources within the first bandwidth, the time-frequency resources mapped by the data stream include at least one of the first resource set and the second resource set, the second resource set is the time-frequency resources mapped by the data stream for transmitting the data stream, and the second value is the number of DMRS code division multiplexing CDM groups that do not map the data stream.

21. The method according to claim 20, characterized in that The ratio of the EPRE of the data stream to the EPRE of the DMRS satisfies: or, Here, ρ represents the first value, and γ represents the second value.

22. The method according to claim 21, characterized in that When the ratio of the EPRE of the data stream to the EPRE of the DMRS satisfies: When , the power scaling factor of the DMRS satisfies: When the ratio of the EPRE of the data stream to the EPRE of the DMRS satisfies: When , the power scaling factor of the DMRS satisfies:

23. The method according to claim 18 or 19, characterized in that When the first reference signal is a phase tracking reference signal PTRS, The power scaling factor is related to the ratio of the EPRE of the PTRS to the EPRE of the data stream, and the power scaling factor is the power scaling factor of the PTRS. Among them, the ratio of the EPRE of the PTRS to the EPRE of the data stream is related to a first value and a third value, the first value is the ratio of the number of frequency domain resources included in the first resource set in the first time unit to the number of frequency domain resources included in the time-frequency resources mapped by the data stream in the first time unit, the first resource set is a resource set within a first bandwidth, the time-frequency resources mapped by the data stream are time-frequency resources within the first bandwidth, the time-frequency resources mapped by the data stream include at least one of the first resource set and a second resource set, the second resource set is the time-frequency resources mapped by the data stream for transmitting the data stream, and the third value is the number of layers of the data stream.

24. The method according to claim 23, characterized in that The ratio of the EPRE of the PTRS to the EPRE of the data stream satisfies: β PTRS =(1-ρ)L, or, β PTRS =10log 10 (1-ρ)L Herein, ρ represents the first value, and L represents the second value.

25. The method according to claim 24, characterized in that When the ratio of the EPRE of the PTRS to the EPRE of the data stream satisfies: β PTRS =(1-ρ)L, the power scaling factor of the PTRS satisfies: When the ratio of the EPRE of the PTRS to the EPRE of the data stream satisfies: β PTRS =10log 10 (1-ρ)L, the power scaling factor of the PTRS satisfies:

26. The method according to claim 18 or 19, characterized in that At least one of the first resource sets includes M third resource sets in a second time unit, each of the M third resource sets includes m third resources, and the time domain resource of the m third resources is the second time unit, The m third resources correspond one-to-one to the ports of the m reference signals, or the m third resources correspond to the m first indexes, Wherein, M and m are both integers greater than or equal to 1.

27. The method according to claim 26, characterized in that The indication information is further used to indicate a first port, or a second index, the m reference signal ports include the first port, and the m first indexes include the second index. The at least one first resource set includes at least one first resource, where the first resource is determined based on the m third resources and the first port, or the first resource is determined based on the m third resources and the second index.

28. The method according to claim 26 or 27, characterized in that When the reference signal is a DMRS, the value of m is related to the type of the DMRS, or m is a maximum value of a multi-user multiple-input multiple-output communication device supported by the second communication device.

29. The method according to any one of claims 26 to 28, characterized in that When the first reference signal is a DMRS, The power scaling factor is related to the ratio of the EPRE of the data stream to the EPRE of the DMRS, and the power scaling factor is the power scaling factor of the DMRS, Among them, the ratio of the EPRE of the data stream to the EPRE of the DMRS is related to the fourth value and the second value, the M third resource sets are time-frequency resources within the second bandwidth, the fourth value is the total number of frequency domain resources included in the time-frequency resource units mapped to the data stream within the second bandwidth, and the second value is the number of DMRS code division multiplexing CDM groups that do not map the data stream.

30. The method according to claim 29, characterized in that The ratio of the EPRE of the data stream to the EPRE of the DMRS satisfies: or, Wherein, R represents the fourth value, and γ represents the second value.

31. The method according to claim 30, characterized in that When the ratio of the EPRE of the data stream to the EPRE of the DMRS satisfies: When , the power scaling factor of the DMRS satisfies: When the ratio of the EPRE of the data stream to the EPRE of the DMRS satisfies: When , the power scaling factor of the DMRS satisfies:

32. The method according to any one of claims 26 to 28, characterized in that When the first reference signal is PTRS, The power scaling factor is related to the ratio of the EPRE of the PTRS to the EPRE of the data stream, and the power scaling factor is the power scaling factor of the PTRS. Among them, the ratio of the EPRE of the PTRS to the EPRE of the data stream is related to the fourth value and the third value, the M third resource sets are time-frequency resources within the second bandwidth, the fourth value is the total number of frequency domain resources included in the time-frequency resource unit mapped to the data stream within the second bandwidth, and the third value is the number of layers of the data stream.

33. The method according to claim 32, characterized in that The ratio of the EPRE of the PTRS to the EPRE of the data stream satisfies: or, Among them, R represents the fourth value, and L represents the third value.

34. The method according to claim 33, characterized in that When the ratio of the EPRE of the PTRS to the EPRE of the data stream satisfies: When , the power scaling factor of the PTRS satisfies: When the ratio of the EPRE of the PTRS to the EPRE of the data stream satisfies: When , the power scaling factor of the PTRS satisfies:

35. A communication device, characterized in that: The method comprises a module or a unit for executing the method according to any one of claims 1 to 17.

36. A communication device, characterized in that: The method comprises modules or units for executing the method according to any one of claims 18 to 34.

37. A communication device, characterized in that: The communication device comprises a processor, wherein the processor is coupled to a memory, wherein the memory stores instructions, and when the instructions are executed by the processor, the communication device performs the method according to any one of claims 1 to 17.

38. A communication device, characterized in that: The communication device comprises a processor, wherein the processor is coupled to a memory, wherein the memory stores instructions, and when the instructions are executed by the processor, the communication device performs the method according to any one of claims 18 to 34.

39. A computer-readable storage medium, characterized in that: The computer-readable storage medium is used to store a computer program, which, when executed on a computer, enables the computer to execute the method according to any one of claims 1 to 17, or enables the computer to execute the method according to any one of claims 18 to 34.

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