Channel measurement method, and apparatus

Abstract

Provided in the present application are a channel measurement method, and an apparatus. The channel measurement method comprises: on the basis of a measurement result of a first reference signal, a network device determining first configuration information for a downlink reference signal; and, on the basis of the measurement result of the first reference signal, the network device determining second configuration information for an uplink reference signal, the first reference signal being used for measuring channel parameters of an uplink channel and a downlink channel. Said method uses a configuration of two-stage reference signals during channel measurement, and second-stage reference signals (for example, the uplink reference signal and the downlink reference signal) can be flexibly configured on the basis of measurement results of first-stage reference signals (for example, the first reference signal) on channels, thereby reducing resource overhead of reference signals for channel measurement.

Description

Channel measurement method and device

[0001] This application claims priority to the Chinese patent application filed with the State Intellectual Property Office of China on August 17, 2023, with application number 202311043221.2 and application name “Method and Device for Channel Measurement”, the entire contents of which are incorporated by reference into this application. Technical Field

[0002] The present application relates to the field of communication technology, and more specifically, to a method and device for channel measurement. Background Art

[0003] Currently, in frequency division duplex (FDD) systems, the uplink and downlink spectrum are asymmetric, so the uplink and downlink channels do not have channel reciprocity. Network devices measure the downlink channel by sending CSI-RS to terminal devices. The resource overhead of the network device sending CSI-RS is related to the number of antennas used by the network device to send CSI-RS. With the future development of massive multiple input multiple output (MIMO) technology, the antenna scale of network devices will further increase, and the resource overhead of CSI-RS will also increase exponentially. In time division duplex (TDD) systems, the uplink channel spectrum is symmetric with the downlink channel spectrum, so the uplink and downlink channels have channel reciprocity. Network devices can measure the downlink channel by receiving SRS from terminal devices. The resource overhead of the terminal device sending SRS is related to the number of terminal devices to be measured and the number of antennas of the terminal devices. As the number of terminal devices increases in the future, the resource overhead of SRS will also increase exponentially. Therefore, how to effectively control the resource overhead of the reference signal and obtain high-precision channel measurement results during channel measurement is an urgent problem that needs to be solved.

[0004] Summary of the Invention

[0005] The present application provides a channel measurement method and apparatus, which can reduce the resource overhead of reference signals.

[0006] In a first aspect, a channel measurement method is provided. The method may be executed by a network device, or may be executed by a chip or circuit configured in the network device, and this application does not limit this.

[0007] The method includes: a network device obtaining a measurement result of a first reference signal, the first reference signal being used to measure first channel parameters of an uplink channel and a downlink channel, the uplink channel and the downlink channel being channels for communication between a terminal device and the network device. The network device determining, based on the measurement result of the first reference signal, first configuration information and second configuration information, the first configuration information being used to configure a downlink reference signal for measuring the downlink channel, and the second configuration information being used to configure an uplink reference signal for measuring the uplink channel.

[0008] Exemplarily, the network device may obtain the measurement result of the first reference signal in the following two ways:

[0009] Method 1: The network device determines third configuration information; the network device sends a first reference signal to the terminal device according to the third configuration information; and the network device receives a measurement result of the first reference signal from the terminal device.

[0010] Specifically, the third configuration information includes at least one of the following information about the network device sending the first reference signal:

[0011] The type of the first reference signal sent, the frequency domain density or frequency domain unit interval of sending the first reference signal, the time domain density or time domain period or time domain unit interval of sending the first reference signal, the frequency domain resource position of sending the first reference signal (for example, the starting frequency domain position of sending the first reference signal, the frequency domain unit length or frequency domain subband length corresponding to the first reference signal), the time domain resource position of sending the first reference signal (for example, the starting time domain unit position of sending the first reference signal, the time domain unit length corresponding to the first reference signal), etc.

[0012] Method 2: The network device sends fourth configuration information to the terminal device; the network device receives a first reference signal from the terminal device, where the first reference signal is sent by the terminal device according to the fourth configuration information; the network device determines a measurement result of the first reference signal based on the received first reference signal.

[0013] Specifically, the fourth configuration information includes at least one of the following information about the terminal device sending the first reference signal:

[0014] The type of the first reference signal sent, the frequency domain density or frequency domain unit interval of sending the first reference signal, the time domain density or time domain period or time domain unit interval of sending the first reference signal, the frequency domain resource position of sending the first reference signal (for example, the starting frequency domain position of sending the first reference signal, the frequency domain unit length or frequency domain subband length corresponding to the first reference signal), the time domain resource position of sending the first reference signal (for example, the starting time domain unit position of sending the first reference signal, the time domain unit length corresponding to the first reference signal), etc.

[0015] The above method uses a two-level reference signal configuration during channel measurement. Based on the measurement results of the first-level reference signal, channel statistical characteristic parameters (i.e., the first channel parameters mentioned above) in the spatial, time, or frequency domains can be obtained. This allows the configuration of a second-level measurement reference signal that best matches the channel characteristics, thereby minimizing reference signal overhead while ensuring channel measurement accuracy.

[0016] In combination with the first aspect, in certain implementations of the first aspect, the above-mentioned first configuration information is used to configure at least one first resource unit set carrying the above-mentioned downlink reference signal, each first resource unit set includes M first resource units, and the above-mentioned second configuration information is used to configure at least one second resource unit set carrying the above-mentioned uplink reference signal, each second resource unit set includes M second resource units, and there is a preset first offset between the M first resource units and the M second resource units.

[0017] Specifically, "there is a preset first offset between the above-mentioned M first resource units and the M second resource units" can be "there is a preset first offset between the above-mentioned M first resource units and the M second resource units in the time domain" and / or "there is a preset first offset between the above-mentioned M first resource units and the M second resource units in the frequency domain".

[0018] More specifically, the first resource unit set includes the M first resource units, and the second resource unit set includes the M second resource units. The time domain resource length and / or frequency domain resource length occupied by the first resource unit set and the second resource unit set are the same, or the time domain resource length and / or frequency domain resource length occupied by the first resource unit and the second resource unit are the same. The time domain resources and frequency domain resources of the first resource unit set where the M first resource units are located and the second resource unit set where the M second resource units are located are the same in size, or the number of time domain units and / or frequency domain units included in the first resource unit set where the M first resource units are located and the number of time domain units included in the second resource unit set where the M second resource units are located are the same. The indexes of the M first resource units in the first resource unit set are the same as the indexes of the M second resource units in the second resource unit set. The indexes of the M first resource units in the first resource unit set can be offsets compared to the time domain starting position of the first resource unit set, or offsets compared to the frequency domain starting position of the first resource unit set. The above-mentioned first resource unit set or second resource unit set includes at least one time-frequency resource block, and each time-frequency resource block may include at least one frequency domain unit and / or at least one resource unit corresponding to the time domain unit. For example, the frequency domain unit may be a subcarrier, a resource block (RB) or a frequency domain subband. The time domain unit may be an orthogonal frequency division multiplexing (OFDM) symbol, a time slot or a symbol group consisting of multiple OFDM symbols. For the M first resource units carrying the above-mentioned downlink reference signal, the time-frequency resource position or the position or mapping pattern of the time-frequency resource element mapped by the downlink reference signal in each first resource unit set is the same. The same mapped time-frequency resource position may be that the offset of the mapped time domain unit index compared to the time domain starting position of the first resource unit set is the same, and / or the offset of the mapped frequency domain unit index compared to the frequency domain starting position of the first resource unit set is the same. The M first resource elements carrying the downlink reference signal and the M second resource elements carrying the uplink reference signal may be located at different time domain resource locations, such as different OFDM symbols, time slots, subframes, or system frames. The M first resource elements carrying the downlink reference signal and the M second resource elements carrying the uplink reference signal may correspond to different frequency domain resource locations, such as different frequency subbands, bandwidth parts (BWPs), or carriers.The preset first offset can represent the time domain unit interval when the M first resource units carrying the above-mentioned downlink reference signal and the M second resource units carrying the above-mentioned uplink reference signal are located at different time domain resource positions, or the frequency domain unit interval when the M first resource units carrying the above-mentioned downlink reference signal and the M second resource units carrying the above-mentioned uplink reference signal are located at different frequency domain resource positions.

[0019] Exemplarily, the first configuration information and the second configuration information may be the same configuration information, or the first configuration information and the second configuration information may be the same signaling, the same signaling field, or some signaling fields of the first configuration information and the second configuration information are the same.

[0020] By using the above method, the resource configuration rules of the uplink reference signal and the downlink reference signal are the same, and the transmission time slot of the uplink reference signal is aligned with the transmission time slot of the downlink reference signal, which can better control the interference between the uplink and downlink.

[0021] In combination with the first aspect, in certain implementations of the first aspect, the third configuration information is used to configure at least one third resource unit set that carries the first reference signal, and each third resource unit set includes N third resource units. The fourth configuration information is used to configure at least one fourth resource unit set that carries the first reference signal, and each fourth resource unit set includes N fourth resource units. There is a preset second offset between the N third resource units and the N fourth resource units.

[0022] Specifically, "there is a preset second offset between the above-mentioned N third resource units and the N fourth resource units" can be "there is a preset second offset between the above-mentioned N third resource units and the N fourth resource units in the time domain" and / or "there is a preset second offset between the above-mentioned N third resource units and the N fourth resource units in the frequency domain."

[0023] More specifically, the third resource unit set includes the N third resource units, and the fourth resource unit set includes the N fourth resource units. The time domain resource length and / or frequency domain resource length occupied by the third resource unit set and the fourth resource unit set are the same, or the time domain resource length and / or frequency domain resource length occupied by the third resource unit and the fourth resource unit are the same. The size of the time domain resources and frequency domain resources of the third resource unit set where the N third resource units are located and the fourth resource unit set where the N fourth resource units are located are the same, or the number of time domain units and / or frequency domain units included in the third resource unit set where the N third resource units are located and the fourth resource unit set where the N fourth resource units are located are the same. The index of the N third resource units in the third resource unit set is the same as the index of the N fourth resource units in the fourth resource unit set. The index of the N third resource units in the third resource unit set can be an offset compared to the time domain starting position of the third resource unit set, or an offset compared to the frequency domain starting position of the third resource unit set. The third resource unit set or the fourth resource unit set includes at least one time-frequency resource block, and each time-frequency resource block may include at least one frequency domain unit and / or at least one resource unit corresponding to the time domain unit. For example, the frequency domain unit may be a subcarrier, an RB, or a frequency domain subband. The time domain unit may be an OFDM symbol, a time slot, or a symbol group consisting of multiple OFDM symbols. For the N third resource units carrying the first reference signal, the time-frequency resource position or the position or mapping pattern of the time-frequency resource element mapped by the first reference signal in each third resource unit set is the same. The same mapped time-frequency resource position may be that the offset of the mapped time domain unit index relative to the time domain starting position of the third resource unit set is the same, and / or the offset of the mapped frequency domain unit index relative to the frequency domain starting position of the third resource unit set is the same. The N third resource units carrying the first reference signal and the N fourth resource units carrying the first reference signal may be located at different time domain resource positions, for example, in different OFDM symbols, time slots, subframes, or system frames. The N third resource units carrying the first reference signal and the N fourth resource units carrying the first reference signal may correspond to different frequency domain resource locations, for example, in different frequency domain subbands, BWPs, or carriers. The preset second offset may represent a time domain unit interval when the N third resource units carrying the first reference signal and the N fourth resource units carrying the first reference signal are located in different time domain resource locations, or a frequency domain unit interval when the N third resource units carrying the first reference signal and the N fourth resource units carrying the first reference signal are located in different frequency domain resource locations.

[0024] Exemplarily, the third configuration information and the fourth configuration information may be the same configuration information, or the third configuration information and the fourth configuration information may be the same signaling, the same signaling field, or some signaling fields of the third configuration information and the fourth configuration information are the same.

[0025] Through the above method, the resource configuration rules of the first reference signal sent uplink and the first reference signal sent downlink are the same, and the transmission time slot of the first reference signal sent uplink is aligned with the transmission time slot of the first reference signal sent downlink, which can better control the interference between the uplink and the downlink.

[0026] In combination with the first aspect, in certain implementations of the first aspect, the network device sending a first reference signal to the terminal device includes: the network device sending the first reference signal to the terminal device through an antenna port, and the first reference signal is carried on multiple resource units in the above-mentioned N third resource units that are in the same time domain resources, and / or, the first reference signal is carried on multiple resource units in the above-mentioned N third resource units that are in the same frequency domain resources.

[0027] Specifically, the first reference signal is primarily used to measure spatial, time, and frequency domain correlation characteristics of uplink and downlink channels. While measuring spatial domain correlation characteristics requires multiple antenna ports to transmit the first reference signal, measuring time domain correlation characteristics and frequency domain correlation characteristics only requires a single antenna port to transmit the first reference signal, thereby reducing the resource overhead of transmitting the first reference signal.

[0028] In combination with the first aspect, in certain implementations of the first aspect, the above method also includes: the network device sends a downlink reference signal to the terminal device according to the above first configuration information; the network device receives the measurement result of the downlink reference signal from the terminal device; the network device estimates the downlink channel based on the above first channel parameters and the measurement result of the downlink reference signal.

[0029] Specifically, the first configuration information includes at least one of the following information for the network device to send a downlink reference signal:

[0030] The type of downlink reference signal sent, the frequency domain density or frequency domain unit interval for sending the downlink reference signal, the time domain density or time domain period or time domain unit interval for sending the downlink reference signal, the frequency domain resource position for sending the downlink reference signal (for example, the starting frequency domain position for sending the downlink reference signal, the frequency domain unit length or frequency domain subband length corresponding to the downlink reference signal), the time domain resource position for sending the downlink reference signal (for example, the starting time domain unit position for sending the downlink reference signal, the time domain unit length corresponding to the downlink reference signal), etc.

[0031] Through the above method, a two-level reference signal configuration can be used to realize the estimation or measurement of the downlink channel. The first-level reference signal is used to measure the channel statistical characteristic parameters in the same spatial domain, time domain or frequency domain as the uplink channel and the downlink channel; the second-level reference signal is used to measure the channel parameters unique to the downlink channel, thereby reducing the overall resource overhead of the reference signal.

[0032] In combination with the first aspect, in certain implementations of the first aspect, the above method also includes: the network device sends second configuration information to the terminal device; the network device receives an uplink reference signal from the terminal device, and the uplink reference signal is sent by the terminal device according to the second configuration information; the network device estimates the uplink channel based on the measurement results of the above-mentioned first channel parameters and the uplink reference signal.

[0033] Specifically, the second configuration information includes at least one of the following information about the terminal device sending an uplink reference signal:

[0034] The type of uplink reference signal sent, the frequency domain density or frequency domain unit interval of the uplink reference signal sent, the time domain density or time domain period or time domain unit interval of the uplink reference signal sent, the frequency domain resource position of the uplink reference signal sent (for example, the starting frequency domain position of the uplink reference signal, the frequency domain unit length or frequency domain subband length corresponding to the uplink reference signal), the time domain resource position of the uplink reference signal sent (for example, the starting time domain unit position of the uplink reference signal, the time domain unit length corresponding to the uplink reference signal), etc.

[0035] Through the above method, the estimation or measurement of the uplink channel can be realized by using the configuration of two-level reference signals. The first-level reference signal is used to measure the channel statistical characteristic parameters in the same spatial domain, time domain or frequency domain as the uplink channel and the downlink channel; the second-level reference signal is used to measure the channel parameters unique to the downlink channel, thereby reducing the overall resource overhead of the reference signal.

[0036] In combination with the first aspect, in some implementations of the first aspect, the transmission period of the first reference signal is greater than the transmission period of the downlink reference signal, and / or the transmission period of the first reference signal is greater than the transmission period of the uplink reference signal.

[0037] Since the spatial, time, and frequency domain characteristics of the channel measured by the first reference signal are slowly changing, and the small-scale characteristics of the channel measured by the uplink reference signal and the downlink reference signal are rapidly changing, the first reference signal can be configured to be sent in a long period, and the uplink reference signal and the downlink reference signal can be sent in a short period, thereby reducing the resource overhead of the first reference signal.

[0038] Alternatively, the frequency domain density for transmitting the first reference signal is less than the frequency domain density for transmitting the downlink reference signal, and / or the frequency domain density for transmitting the first reference signal is less than the frequency domain density for transmitting the uplink reference signal. Alternatively, the time domain density for transmitting the first reference signal is less than the time domain density for transmitting the downlink reference signal, and / or the time domain density for transmitting the first reference signal is less than the time domain density for transmitting the uplink reference signal. The frequency domain density of a reference signal represents the number of frequency domain resource locations to which the reference signal is mapped or the number of frequency domain units to which the reference signal is mapped within a frequency domain unit set. The frequency domain unit set may be a frequency domain subband or frequency domain bandwidth of a predefined size, and the frequency domain unit may be a subcarrier, RB, etc. In one implementation, the reference signal may be resource mapped with equal frequency domain unit spacing, and a larger or smaller frequency domain density indicates a smaller or larger spacing of the frequency domain units. The time domain density of a reference signal represents the number of time domain resource locations to which the reference signal is mapped or the number of time domain units to which the reference signal is mapped within a time domain unit set. The time domain unit set may be a time length window consisting of multiple time domain units, and the time domain unit may be an OFDM symbol, a time slot, etc. In one implementation, the reference signal may be transmitted in a periodic manner (equal time domain unit interval manner), and a large or small time domain density indicates a small or large interval of the time domain units, or a small or large transmission period.

[0039] Specifically, the first channel parameter includes at least one of the following information:

[0040] Angular power spectrum, delay power spectrum, Doppler power spectrum, spatial domain correlation, frequency domain correlation, time domain correlation, the index of at least one beam or spatial basis vector corresponding to the terminal device, the index of at least one delay path or frequency domain basis vector corresponding to the terminal device, etc.

[0041] If the frequency domain correlation between the uplink channel and the downlink channel is greater than the first threshold, the distance in the frequency domain between any two adjacent resource units in the above-mentioned M first resource units or the above-mentioned M second resource units that are in the same time domain is greater than the third offset, and / or, if the time domain correlation between the uplink channel and the downlink channel is greater than the fourth threshold, the distance in the time domain between any two adjacent resource units in the above-mentioned M first resource units and the above-mentioned M second resource units that are in the same frequency domain is greater than the fourth offset.

[0042] By using the above method, the time domain resource density and frequency domain resource density carrying the above uplink reference signal or the above downlink reference signal can be controlled, thereby reducing the resource overhead of the uplink reference signal or the downlink reference signal.

[0043] In addition, if the frequency domain correlation between the uplink channel and the downlink channel is less than the first threshold, the distance in the frequency domain between any two adjacent resource units in the above-mentioned M first resource units or the above-mentioned M second resource units that are in the same time domain is less than the third offset, and / or, if the time domain correlation between the uplink channel and the downlink channel is less than the fourth threshold, the distance in the time domain between any two adjacent resource units in the above-mentioned M first resource units and the above-mentioned M second resource units that are in the same frequency domain is less than the fourth offset.

[0044] Furthermore, multiple thresholds can be set for frequency domain correlation, and when the frequency domain correlation is between two adjacent thresholds, a time domain resource density and a frequency domain resource density will be corresponding, thereby achieving fine control of the time domain resource density and the frequency domain resource density of the uplink reference signal or the above-mentioned downlink reference signal. Alternatively, multiple thresholds can be set for time domain correlation, and when the time domain correlation is between two adjacent thresholds, a time domain resource density and a frequency domain resource density will be corresponding, thereby achieving fine control of the time domain resource density and the frequency domain resource density of the uplink reference signal or the above-mentioned downlink reference signal.

[0045] In a second aspect, a channel measurement method is provided. The method can be executed by a terminal device, or can also be executed by a chip or circuit configured in the terminal device, and this application does not limit this.

[0046] The method includes: a terminal device sends a measurement result of a first reference signal to a network device or the terminal device sends a first reference signal to the network device, the terminal device sends the first reference signal to the network device for the network device to obtain the measurement result of the first reference signal, the measurement result of the first reference signal is used by the network device to determine first configuration information and second configuration information, the first reference signal is used to measure first channel parameters of an uplink channel and a downlink channel, the uplink channel and the downlink channel are channels for communication between the terminal device and the network device, the first configuration information is used to configure a downlink reference signal for measuring the downlink channel, and the second configuration information is used to configure an uplink reference signal for measuring the uplink channel.

[0047] Exemplarily, the above-mentioned terminal device sends the measurement result of the first reference signal to the network device, including: the terminal device receives the first reference signal from the network device, and the first reference signal is sent by the network device according to the third configuration information; the terminal device determines the measurement result of the first reference signal based on the received first reference signal; the terminal device sends the measurement result of the first reference signal to the network device.

[0048] Specifically, the third configuration information includes at least one of the following information about the network device sending the first reference signal:

[0049] The type of the first reference signal sent, the frequency domain density or frequency domain unit interval of sending the first reference signal, the time domain density or time domain period or time domain unit interval of sending the first reference signal, the frequency domain resource position of sending the first reference signal (for example, the starting frequency domain position of sending the first reference signal, the frequency domain unit length or frequency domain subband length corresponding to the first reference signal), the time domain resource position of sending the first reference signal (for example, the starting time domain unit position of sending the first reference signal, the time domain unit length corresponding to the first reference signal), etc.

[0050] Exemplarily, the terminal device sending the first reference signal to the network device includes: the terminal device receiving fourth configuration information from the network device; and the terminal device sending the first reference signal to the network device according to the fourth configuration information.

[0051] Specifically, the fourth configuration information includes at least one of the following information about the terminal device sending the first reference signal:

[0052] The type of the first reference signal sent, the frequency domain density or frequency domain unit interval of sending the first reference signal, the time domain density or time domain period or time domain unit interval of sending the first reference signal, the frequency domain resource position of sending the first reference signal (for example, the starting frequency domain position of sending the first reference signal, the frequency domain unit length or frequency domain subband length corresponding to the first reference signal), the time domain resource position of sending the first reference signal (for example, the starting time domain unit position of sending the first reference signal, the time domain unit length corresponding to the first reference signal), etc.

[0053] The above method uses a two-level reference signal configuration during channel measurement. Based on the measurement results of the first-level reference signal, channel statistical characteristic parameters (i.e., the first channel parameters mentioned above) in the spatial, time, or frequency domains can be obtained. This allows the configuration of a second-level measurement reference signal that best matches the channel characteristics, thereby minimizing reference signal overhead while ensuring channel measurement accuracy.

[0054] In combination with the second aspect, in certain implementations of the second aspect, the above-mentioned first configuration information is used to configure at least one first resource unit set carrying the above-mentioned downlink reference signal, each first resource unit set includes M first resource units, and the above-mentioned second configuration information is used to configure at least one second resource unit set carrying the above-mentioned uplink reference signal, each second resource unit set includes M second resource units, and there is a preset first offset between the M first resource units and the M second resource units.

[0055] Specifically, "there is a preset first offset between the above-mentioned M first resource units and the M second resource units" can be "there is a preset first offset between the above-mentioned M first resource units and the M second resource units in the time domain" and / or "there is a preset first offset between the above-mentioned M first resource units and the M second resource units in the frequency domain".

[0056] More specifically, the first resource unit set includes the M first resource units, and the second resource unit set includes the M second resource units. The time domain resource length and / or frequency domain resource length occupied by the first resource unit set and the second resource unit set are the same, or the time domain resource length and / or frequency domain resource length occupied by the first resource unit and the second resource unit are the same. The time domain resources and frequency domain resources of the first resource unit set where the M first resource units are located and the second resource unit set where the M second resource units are located are the same in size, or the number of time domain units and / or frequency domain units included in the first resource unit set where the M first resource units are located and the number of time domain units included in the second resource unit set where the M second resource units are located are the same. The indexes of the M first resource units in the first resource unit set are the same as the indexes of the M second resource units in the second resource unit set. The indexes of the M first resource units in the first resource unit set can be offsets compared to the time domain starting position of the first resource unit set, or offsets compared to the frequency domain starting position of the first resource unit set. The above-mentioned first resource unit set or second resource unit set includes at least one time-frequency resource block, and each time-frequency resource block may include at least one frequency domain unit and / or at least one resource unit corresponding to the time domain unit. For example, the frequency domain unit may be a subcarrier, a resource block (RB) or a frequency domain subband. The time domain unit may be an orthogonal frequency division multiplexing (OFDM) symbol, a time slot or a symbol group consisting of multiple OFDM symbols. For the M first resource units carrying the above-mentioned downlink reference signal, the time-frequency resource position or the position or mapping pattern of the time-frequency resource element mapped by the downlink reference signal in each first resource unit set is the same. The same mapped time-frequency resource position may be that the offset of the mapped time domain unit index compared to the time domain starting position of the first resource unit set is the same, and / or the offset of the mapped frequency domain unit index compared to the frequency domain starting position of the first resource unit set is the same. The M first resource elements carrying the downlink reference signal and the M second resource elements carrying the uplink reference signal may be located at different time domain resource locations, such as different OFDM symbols, time slots, subframes, or system frames. The M first resource elements carrying the downlink reference signal and the M second resource elements carrying the uplink reference signal may correspond to different frequency domain resource locations, such as different frequency subbands, BWPs, or carriers.The preset first offset can represent the time domain unit interval when the M first resource units carrying the above-mentioned downlink reference signal and the M second resource units carrying the above-mentioned uplink reference signal are located at different time domain resource positions, or the frequency domain unit interval when the M first resource units carrying the above-mentioned downlink reference signal and the M second resource units carrying the above-mentioned uplink reference signal are located at different frequency domain resource positions.

[0057] Exemplarily, the first configuration information and the second configuration information may be the same configuration information, or the first configuration information and the second configuration information may be the same signaling, the same signaling field, or some signaling fields of the first configuration information and the second configuration information are the same.

[0058] By using the above method, the resource configuration rules of the uplink reference signal and the downlink reference signal are the same, and the transmission time slot of the uplink reference signal is aligned with the transmission time slot of the downlink reference signal, which can better control the interference between the uplink and downlink.

[0059] In combination with the second aspect, in certain implementations of the second aspect, the above-mentioned third configuration information is used to configure at least one third resource unit set carrying the above-mentioned first reference signal, each third resource unit set including N third resource units, and the above-mentioned fourth configuration information is used to configure at least one fourth resource unit set carrying the above-mentioned first reference signal, each fourth resource unit set including N fourth resource units, and there is a preset second offset between the N third resource units and the N fourth resource units.

[0060] Specifically, "there is a preset second offset between the above-mentioned N third resource units and the N fourth resource units" can be "there is a preset second offset between the above-mentioned N third resource units and the N fourth resource units in the time domain" and / or "there is a preset second offset between the above-mentioned N third resource units and the N fourth resource units in the frequency domain."

[0061] More specifically, the third resource unit set includes the N third resource units, and the fourth resource unit set includes the N fourth resource units. The time domain resource length and / or frequency domain resource length occupied by the third resource unit set and the fourth resource unit set are the same, or the time domain resource length and / or frequency domain resource length occupied by the third resource unit and the fourth resource unit are the same. The size of the time domain resources and frequency domain resources of the third resource unit set where the N third resource units are located and the fourth resource unit set where the N fourth resource units are located are the same, or the number of time domain units and / or frequency domain units included in the third resource unit set where the N third resource units are located and the fourth resource unit set where the N fourth resource units are located are the same. The index of the N third resource units in the third resource unit set is the same as the index of the N fourth resource units in the fourth resource unit set. The index of the N third resource units in the third resource unit set can be an offset compared to the time domain starting position of the third resource unit set, or an offset compared to the frequency domain starting position of the third resource unit set. The third resource unit set or the fourth resource unit set includes at least one time-frequency resource block, and each time-frequency resource block may include at least one frequency domain unit and / or at least one resource unit corresponding to the time domain unit. For example, the frequency domain unit may be a subcarrier, an RB, or a frequency domain subband. The time domain unit may be an OFDM symbol, a time slot, or a symbol group consisting of multiple OFDM symbols. For the N third resource units carrying the first reference signal, the time-frequency resource position or the position or mapping pattern of the time-frequency resource element mapped by the first reference signal in each third resource unit set is the same. The same mapped time-frequency resource position may be that the offset of the mapped time domain unit index relative to the time domain starting position of the third resource unit set is the same, and / or the offset of the mapped frequency domain unit index relative to the frequency domain starting position of the third resource unit set is the same. The N third resource units carrying the first reference signal and the N fourth resource units carrying the first reference signal may be located at different time domain resource positions, for example, in different OFDM symbols, time slots, subframes, or system frames. The N third resource units carrying the first reference signal and the N fourth resource units carrying the first reference signal may correspond to different frequency domain resource locations, for example, in different frequency domain subbands, BWPs, or carriers. The preset second offset may represent a time domain unit interval when the N third resource units carrying the first reference signal and the N fourth resource units carrying the first reference signal are located in different time domain resource locations, or a frequency domain unit interval when the N third resource units carrying the first reference signal and the N fourth resource units carrying the first reference signal are located in different frequency domain resource locations.

[0062] Exemplarily, the third configuration information and the fourth configuration information may be the same configuration information, or the third configuration information and the fourth configuration information may be the same signaling, the same signaling field, or some signaling fields of the third configuration information and the fourth configuration information are the same.

[0063] Through the above method, the resource configuration rules of the first reference signal sent uplink and the first reference signal sent downlink are the same, and the transmission time slot of the first reference signal sent uplink is aligned with the transmission time slot of the first reference signal sent downlink, which can better control the interference between the uplink and the downlink.

[0064] In combination with the second aspect, in certain implementations of the second aspect, the above-mentioned terminal device sending a first reference signal to the network device includes: the terminal device sending the first reference signal to the network device through an antenna port, and the first reference signal is carried on multiple resource units in the above-mentioned N fourth resource units that are in the same time domain resources, and / or, the first reference signal is carried on multiple resource units in the above-mentioned N fourth resource units that are in the same frequency domain resources.

[0065] Specifically, the first reference signal is primarily used to measure spatial, time, and frequency domain correlation characteristics of uplink and downlink channels. While measuring spatial domain correlation characteristics requires multiple antenna ports to transmit the first reference signal, measuring time domain correlation characteristics and frequency domain correlation characteristics only requires a single antenna port to transmit the first reference signal, thereby reducing the resource overhead of transmitting the first reference signal.

[0066] In combination with the second aspect, in certain implementations of the second aspect, the above method also includes: the terminal device receives a downlink reference signal from the network device, and the downlink reference signal is sent by the network device according to the above first configuration information; the terminal device determines the measurement result of the downlink reference signal based on the received downlink reference signal; the terminal device sends the measurement result of the downlink reference signal to the network device, and the measurement result of the downlink reference signal and the above first channel parameter are used by the network device to estimate the downlink channel.

[0067] Specifically, the first configuration information includes at least one of the following information for the network device to send a downlink reference signal:

[0068] The type of downlink reference signal sent, the frequency domain density or frequency domain unit interval for sending the downlink reference signal, the time domain density or time domain period or time domain unit interval for sending the downlink reference signal, the frequency domain resource position for sending the downlink reference signal (for example, the starting frequency domain position for sending the downlink reference signal, the frequency domain unit length or frequency domain subband length corresponding to the downlink reference signal), the time domain resource position for sending the downlink reference signal (for example, the starting time domain unit position for sending the downlink reference signal, the time domain unit length corresponding to the downlink reference signal), etc.

[0069] Through the above method, a two-level reference signal configuration can be used to realize the estimation or measurement of the downlink channel. The first-level reference signal is used to measure the channel statistical characteristic parameters in the same spatial domain, time domain or frequency domain as the uplink channel and the downlink channel; the second-level reference signal is used to measure the channel parameters unique to the downlink channel, thereby reducing the overall resource overhead of the reference signal.

[0070] In combination with the second aspect, in certain implementations of the second aspect, the above method also includes: the terminal device receives second configuration information from the network device; the terminal device sends an uplink reference signal to the network device based on the second configuration information, so that the network device obtains the measurement results of the uplink reference signal, and the measurement results of the uplink signal parameters and the above-mentioned first channel parameters are used by the network device to estimate the uplink channel.

[0071] Specifically, the second configuration information includes at least one of the following information about the terminal device sending an uplink reference signal:

[0072] The type of uplink reference signal sent, the frequency domain density or frequency domain unit interval of the uplink reference signal sent, the time domain density or time domain period or time domain unit interval of the uplink reference signal sent, the frequency domain resource position of the uplink reference signal sent (for example, the starting frequency domain position of the uplink reference signal, the frequency domain unit length or frequency domain subband length corresponding to the uplink reference signal), the time domain resource position of the uplink reference signal sent (for example, the starting time domain unit position of the uplink reference signal, the time domain unit length corresponding to the uplink reference signal), etc.

[0073] Through the above method, the estimation or measurement of the uplink channel can be realized by using the configuration of two-level reference signals. The first-level reference signal is used to measure the channel statistical characteristic parameters in the same spatial domain, time domain or frequency domain as the uplink channel and the downlink channel; the second-level reference signal is used to measure the channel parameters unique to the downlink channel, thereby reducing the overall resource overhead of the reference signal.

[0074] In combination with the second aspect, in certain implementations of the second aspect, the transmission period of the first reference signal is greater than the transmission period of the downlink reference signal, and / or the transmission period of the first reference signal is greater than the transmission period of the uplink reference signal.

[0075] Since the spatial, time, and frequency domain characteristics of the channel measured by the first reference signal are slowly changing, and the small-scale characteristics of the channel measured by the uplink reference signal and the downlink reference signal are rapidly changing, the first reference signal can be configured to be sent in a long period, and the uplink reference signal and the downlink reference signal can be sent in a short period, thereby reducing the resource overhead of the first reference signal.

[0076] Alternatively, the frequency domain density for transmitting the first reference signal is less than the frequency domain density for transmitting the downlink reference signal, and / or the frequency domain density for transmitting the first reference signal is less than the frequency domain density for transmitting the uplink reference signal. Alternatively, the time domain density for transmitting the first reference signal is less than the time domain density for transmitting the downlink reference signal, and / or the time domain density for transmitting the first reference signal is less than the time domain density for transmitting the uplink reference signal. The frequency domain density of a reference signal represents the number of frequency domain resource locations to which the reference signal is mapped or the number of frequency domain units to which the reference signal is mapped within a frequency domain unit set. The frequency domain unit set may be a frequency domain subband or frequency domain bandwidth of a predefined size, and the frequency domain unit may be a subcarrier, RB, etc. In one implementation, the reference signal may be resource mapped with equal frequency domain unit spacing, and a larger or smaller frequency domain density indicates a smaller or larger spacing of the frequency domain units. The time domain density of a reference signal represents the number of time domain resource locations to which the reference signal is mapped or the number of time domain units to which the reference signal is mapped within a time domain unit set. The time domain unit set may be a time length window consisting of multiple time domain units, and the time domain unit may be an OFDM symbol, a time slot, etc. In one implementation, the reference signal may be transmitted in a periodic manner (equal time domain unit interval manner), and a large or small time domain density indicates a small or large interval of the time domain units, or a small or large transmission period.

[0077] Specifically, the first channel parameter includes at least one of the following information:

[0078] Angular power spectrum, delay power spectrum, Doppler power spectrum, spatial domain correlation, frequency domain correlation, time domain correlation, the index of at least one beam or spatial basis vector corresponding to the terminal device, the index of at least one delay path or frequency domain basis vector corresponding to the terminal device, etc.

[0079] If the frequency domain correlation between the uplink channel and the downlink channel is greater than the first threshold, the distance in the frequency domain between any two adjacent resource units in the above-mentioned M first resource units or the above-mentioned M second resource units that are in the same time domain is greater than the third offset, and / or, if the time domain correlation between the uplink channel and the downlink channel is greater than the fourth threshold, the distance in the time domain between any two adjacent resource units in the above-mentioned M first resource units and the above-mentioned M second resource units that are in the same frequency domain is greater than the fourth offset.

[0080] By using the above method, the time domain resource density and frequency domain resource density carrying the above uplink reference signal or the above downlink reference signal can be controlled, thereby reducing the resource overhead of the uplink reference signal or the downlink reference signal.

[0081] In addition, if the frequency domain correlation between the uplink channel and the downlink channel is less than the first threshold, the distance in the frequency domain between any two adjacent resource units in the above-mentioned M first resource units or the above-mentioned M second resource units that are in the same time domain is less than the third offset, and / or, if the time domain correlation between the uplink channel and the downlink channel is less than the fourth threshold, the distance in the time domain between any two adjacent resource units in the above-mentioned M first resource units and the above-mentioned M second resource units that are in the same frequency domain is less than the fourth offset.

[0082] Furthermore, multiple thresholds can be set for frequency domain correlation, and when the frequency domain correlation is between two adjacent thresholds, a time domain resource density and a frequency domain resource density will be corresponding, thereby achieving fine control of the time domain resource density and the frequency domain resource density of the uplink reference signal or the above-mentioned downlink reference signal. Alternatively, multiple thresholds can be set for time domain correlation, and when the time domain correlation is between two adjacent thresholds, a time domain resource density and a frequency domain resource density will be corresponding, thereby achieving fine control of the time domain resource density and the frequency domain resource density of the uplink reference signal or the above-mentioned downlink reference signal.

[0083] In a third aspect, a channel measurement device is provided, comprising: a transceiver unit and a processing unit, wherein the transceiver unit is configured to obtain a measurement result of a first reference signal, the first reference signal being used to measure first channel parameters of an uplink channel and a downlink channel, the uplink channel and the downlink channel being channels for communication between a terminal device and a network device. The processing unit is configured to determine, based on the measurement result of the first reference signal, first configuration information and second configuration information, the first configuration information being used to configure a downlink reference signal for measuring the downlink channel, and the second configuration information being used to configure an uplink reference signal for measuring the uplink channel.

[0084] The transceiver unit is used to obtain the measurement result of the first reference signal in the following two ways:

[0085] Method 1: The above-mentioned processing unit is used to determine the third configuration information; the above-mentioned transceiver unit is also used to send the first reference signal to the terminal device according to the third configuration information; the above-mentioned transceiver unit is also used to receive the measurement result of the first reference signal from the terminal device.

[0086] Method 2: The above-mentioned transceiver unit is used to send the fourth configuration information to the terminal device; the above-mentioned transceiver unit is also used to receive a first reference signal from the terminal device, and the first reference signal is sent by the terminal device according to the fourth configuration information; the above-mentioned processing unit is also used to determine the measurement result of the first reference signal based on the received first reference signal.

[0087] In combination with the third aspect, in certain implementations of the third aspect, the above-mentioned first configuration information is used to configure at least one first resource unit set carrying the above-mentioned downlink reference signal, each first resource unit set includes M first resource units, and the above-mentioned second configuration information is used to configure at least one second resource unit set carrying the above-mentioned uplink reference signal, each second resource unit set includes M second resource units, and there is a preset first offset between the M first resource units and the M second resource units.

[0088] In combination with the third aspect, in certain implementations of the third aspect, the above-mentioned third configuration information is used to configure at least one third resource unit set carrying the above-mentioned first reference signal, each third resource unit set including N third resource units, and the above-mentioned fourth configuration information is used to configure at least one fourth resource unit set carrying the above-mentioned first reference signal, each fourth resource unit set including N fourth resource units, and there is a preset second offset between the N third resource units and the N fourth resource units.

[0089] In combination with the third aspect, in certain implementations of the third aspect, the above-mentioned transceiver unit is used to send a first reference signal to the terminal device, including: the above-mentioned transceiver unit is also used to send a first reference signal to the terminal device through an antenna port, and the first reference signal is carried on multiple resource units in the same time domain among the above-mentioned N third resource units, and / or the first reference signal is carried on multiple resource units in the same frequency domain among the above-mentioned N third resource units.

[0090] In combination with the third aspect, in certain implementations of the third aspect, the above-mentioned transceiver unit is also used to send a downlink reference signal to the terminal device according to the above-mentioned first configuration information; the above-mentioned transceiver unit is also used to receive the measurement results of the downlink reference signal from the terminal device; the above-mentioned processing unit is also used to estimate the downlink channel based on the above-mentioned first channel parameters and the measurement results of the downlink reference signal.

[0091] In combination with the third aspect, in certain implementations of the third aspect, the above-mentioned transceiver unit is also used to send second configuration information to the terminal device; the above-mentioned transceiver unit is also used to receive an uplink reference signal from the terminal device, which uplink reference signal is sent by the terminal device according to the second configuration information; the above-mentioned processing unit is also used to estimate the uplink channel based on the measurement results of the above-mentioned first channel parameters and the uplink reference signal.

[0092] In combination with the third aspect, in certain implementations of the third aspect, the transmission period of the first reference signal is greater than the transmission period of the downlink reference signal, and / or the transmission period of the first reference signal is greater than the transmission period of the uplink reference signal.

[0093] Specifically, the first channel parameter includes at least one of the following information:

[0094] Angular power spectrum, delay power spectrum, Doppler power spectrum, spatial domain correlation, frequency domain correlation, time domain correlation, the index of at least one beam or spatial basis vector corresponding to the terminal device, the index of at least one delay path or frequency domain basis vector corresponding to the terminal device, etc.

[0095] If the frequency domain correlation between the uplink channel and the downlink channel is greater than the first threshold, the distance in the frequency domain between any two adjacent resource units in the above-mentioned M first resource units or the above-mentioned M second resource units that are in the same time domain is greater than the third offset, and / or, if the time domain correlation between the uplink channel and the downlink channel is greater than the fourth threshold, the distance in the time domain between any two adjacent resource units in the above-mentioned M first resource units and the above-mentioned M second resource units that are in the same frequency domain is greater than the fourth offset.

[0096] In addition, if the frequency domain correlation between the uplink channel and the downlink channel is less than the first threshold, the distance in the frequency domain between any two adjacent resource units in the above-mentioned M first resource units or the above-mentioned M second resource units that are in the same time domain is less than the third offset, and / or, if the time domain correlation between the uplink channel and the downlink channel is less than the fourth threshold, the distance in the time domain between any two adjacent resource units in the above-mentioned M first resource units and the above-mentioned M second resource units that are in the same frequency domain is less than the fourth offset.

[0097] The explanation and beneficial effects of the channel measurement device provided in the third aspect can refer to the channel measurement method shown in the first aspect, and will not be repeated here.

[0098] In a fourth aspect, a channel measurement device is provided, which includes: a transceiver unit, the transceiver unit is used to send the measurement result of a first reference signal to a network device or the terminal device sends the first reference signal to the network device, the terminal device sends the first reference signal to the network device for the network device to obtain the measurement result of the first reference signal, the measurement result of the first reference signal is used by the network device to determine first configuration information and second configuration information, the first reference signal is used to measure first channel parameters of an uplink channel and a downlink channel, the uplink channel and the downlink channel are channels for communication between the terminal device and the network device, the first configuration information is used to configure a downlink reference signal for measuring the downlink channel, and the second configuration information is used to configure an uplink reference signal for measuring the uplink channel.

[0099] Among them, the above-mentioned transceiver unit is used to send the measurement result of the first reference signal to the network device, including: the above-mentioned transceiver unit is also used to receive the first reference signal from the network device, and the first reference signal is sent by the network device according to the third configuration information; the above-mentioned device also includes: a processing unit, which is used to determine the measurement result of the first reference signal based on the received first reference signal; the above-mentioned transceiver unit is also used to send the measurement result of the first reference signal to the network device.

[0100] The transceiver unit is used to send the first reference signal to the network device, including: the transceiver unit is used to receive fourth configuration information from the network device; the processing unit is used to send the first reference signal to the network device according to the fourth configuration information.

[0101] In combination with the fourth aspect, in certain implementations of the fourth aspect, the above-mentioned first configuration information is used to configure at least one first resource unit set carrying the above-mentioned downlink reference signal, each first resource unit set includes M first resource units, and the above-mentioned second configuration information is used to configure at least one second resource unit set carrying the above-mentioned uplink reference signal, each second resource unit set includes M second resource units, and there is a preset first offset between the M first resource units and the M second resource units.

[0102] In combination with the fourth aspect, in certain implementations of the fourth aspect, the above-mentioned third configuration information is used to configure at least one third resource unit set carrying the above-mentioned first reference signal, each third resource unit set includes N third resource units, and the above-mentioned fourth configuration information is used to configure at least one fourth resource unit set carrying the above-mentioned first reference signal, each fourth resource unit set includes N fourth resource units, and there is a preset second offset between the N third resource units and the N fourth resource units.

[0103] In combination with the fourth aspect, in certain implementations of the fourth aspect, the above-mentioned transceiver unit is used to send a first reference signal to the network device, including: the above-mentioned transceiver unit is used to send a first reference signal to the network device through an antenna port, and the first reference signal is carried on multiple resource units in the same time domain among the above-mentioned N fourth resource units, and / or the first reference signal is carried on multiple resource units in the same frequency domain among the above-mentioned N fourth resource units.

[0104] In combination with the fourth aspect, in certain implementations of the fourth aspect, the above-mentioned transceiver unit is also used to receive a downlink reference signal from a network device, and the downlink reference signal is sent by the network device according to the above-mentioned first configuration information; the above-mentioned processing unit is also used to determine the measurement result of the downlink reference signal based on the received downlink reference signal; the above-mentioned transceiver unit is also used to send the measurement result of the downlink reference signal to the network device, and the measurement result of the downlink reference signal and the above-mentioned first channel parameter are used by the network device to estimate the downlink channel.

[0105] In combination with the fourth aspect, in certain implementations of the fourth aspect, the above-mentioned transceiver unit is also used to receive second configuration information from the network device; the above-mentioned transceiver unit is also used to send an uplink reference signal to the network device based on the second configuration information, so that the network device obtains the measurement results of the uplink reference signal, and the measurement results of the uplink signal parameters and the above-mentioned first channel parameters are used by the network device to estimate the uplink channel.

[0106] In combination with the fourth aspect, in certain implementations of the fourth aspect, the transmission period of the first reference signal is greater than the transmission period of the downlink reference signal, and / or the transmission period of the first reference signal is greater than the transmission period of the uplink reference signal.

[0107] Specifically, the first channel parameter includes at least one of the following information:

[0108] Angular power spectrum, delay power spectrum, Doppler power spectrum, spatial domain correlation, frequency domain correlation, time domain correlation, the index of at least one beam or spatial basis vector corresponding to the terminal device, the index of at least one delay path or frequency domain basis vector corresponding to the terminal device, etc.

[0109] If the frequency domain correlation between the uplink channel and the downlink channel is greater than the first threshold, the distance in the frequency domain between any two adjacent resource units in the above-mentioned M first resource units or the above-mentioned M second resource units that are in the same time domain is greater than the third offset, and / or, if the time domain correlation between the uplink channel and the downlink channel is greater than the fourth threshold, the distance in the time domain between any two adjacent resource units in the above-mentioned M first resource units and the above-mentioned M second resource units that are in the same frequency domain is greater than the fourth offset.

[0110] In addition, if the frequency domain correlation between the uplink channel and the downlink channel is less than the first threshold, the distance in the frequency domain between any two adjacent resource units in the above-mentioned M first resource units or the above-mentioned M second resource units that are in the same time domain is less than the third offset, and / or, if the time domain correlation between the uplink channel and the downlink channel is less than the fourth threshold, the distance in the time domain between any two adjacent resource units in the above-mentioned M first resource units and the above-mentioned M second resource units that are in the same frequency domain is less than the fourth offset.

[0111] The explanation and beneficial effects of the channel measurement device provided in the fourth aspect can refer to the channel measurement method shown in the second aspect and will not be repeated here.

[0112] In a fifth aspect, a communication device is provided, comprising a processor, wherein the processor is configured to enable the communication device to execute the first aspect and any possible method described in the first aspect by executing a computer program or instruction or through a logic circuit; or to enable the communication device to execute the second aspect and any possible method described in the second aspect.

[0113] In a possible implementation, the communication device further includes a memory for storing the computer program or instruction.

[0114] In a possible implementation, the communication device further includes a communication interface, which is used to input and / or output signals.

[0115] In the sixth aspect, a communication device is provided, comprising a logic circuit and an input / output interface, the input / output interface being used to input and / or output signals, the logic circuit being used to execute the method described in the first aspect and any possible embodiment of the first aspect; or, the logic circuit being used to execute the method described in the second aspect and any possible embodiment of the second aspect.

[0116] In the seventh aspect, a computer-readable storage medium is provided, on which a computer program or instruction is stored. When the computer program or the instruction is run on a computer, the method described in the first aspect and any possible method of the first aspect is executed; or, the method described in the second aspect and any possible method of the second aspect is executed.

[0117] In an eighth aspect, a computer program product is provided, comprising instructions, which, when executed on a computer, cause the method described in the first aspect and any possible method of the first aspect to be executed; or cause the method described in the second aspect and any possible method of the second aspect to be executed.

[0118] For the description of the beneficial effects of the fifth to eighth aspects, reference can be made to the description of the first to second aspects. BRIEF DESCRIPTION OF THE DRAWINGS

[0119] FIG1 is a schematic diagram of a communication system 100 applicable to an embodiment of the present application.

[0120] FIG2 is a schematic flowchart of a channel measurement method 200 applicable to an embodiment of the present application.

[0121] FIG3( a ) is a schematic diagram of third configuration information and fourth configuration information applicable to a TDD communication system.

[0122] FIG3( b ) is a schematic diagram of resource configuration of a reference signal according to an embodiment of the present application.

[0123] FIG3( c ) is a schematic diagram of third configuration information and fourth configuration information applicable to an FDD communication system.

[0124] FIG4 is a schematic diagram of resource configuration of a reference signal applicable to an embodiment of the present application.

[0125] FIG5(a) is a schematic diagram of first configuration information and second configuration information applicable to a TDD communication system.

[0126] FIG5(b) is a schematic diagram of first configuration information and second configuration information applicable to an FDD communication system.

[0127] FIG6 is a schematic diagram of resource configuration of a reference signal applicable to an embodiment of the present application.

[0128] FIG7 is a schematic block diagram of a communication device 700 applicable to an embodiment of the present application.

[0129] FIG8 is a schematic block diagram of a communication device 800 applicable to an embodiment of the present application.

[0130] FIG9 is a schematic block diagram of a communication device 900 applicable to an embodiment of the present application. DETAILED DESCRIPTION

[0131] In order to facilitate understanding of the embodiments of the present application, the following points are first explained.

[0132] 1. In this application, unless otherwise specified, "plurality" means two or more.

[0133] 2. 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 based on their internal logical relationships.

[0134] 3. The various numerical numbers involved in this application are only used for the convenience of description and are not used to limit the scope of protection of this application. The size of the serial numbers involved in this application does not mean the order of execution. The order of execution of each process should be determined by its function and internal logic. For example, the terms "first", "second", "third", "fourth" and other various terminology labels (if any) in the specification and claims and drawings of this application are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. Among them, the data used in this way can be interchangeable where appropriate, so that the embodiments described here can be implemented in an order other than what is illustrated or described here.

[0135] At the same time, any embodiment or design described in this application as "exemplary" or "for example" should not be interpreted as being more preferred or more advantageous than other embodiments or designs. Specifically, the use of words such as "exemplary" or "for example" is intended to present the relevant concepts in a concrete manner to facilitate understanding.

[0136] 4. 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.

[0137] 5. In this application, "pre-defined" may include pre-defined, such as protocol definition. "Pre-defined" may be implemented by pre-storing corresponding codes, tables, or other methods that can be used to indicate relevant information in the device. This application does not limit the specific implementation method.

[0138] 6. "Storage" or "saving" as used in this application may refer to storage in one or more memories. The one or more memories may be provided separately or integrated into an encoder or decoder, a processor, or a communication device. The one or more memories may also be partially provided separately and partially integrated into a decoder, processor, or communication device. The type of memory may be any form of storage medium and is not limited thereto.

[0139] 7. The arrows or boxes indicated by dotted lines in the schematic diagrams in the accompanying drawings of this application specification represent optional steps or optional modules.

[0140] 8. In this application, unless otherwise specified, “ / ” indicates that the objects associated with each other are in an “or” relationship. For example, A / B can represent A or B. “And / or” in this application is merely a description of the association relationship between associated objects, indicating that three relationships may exist. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. A and B can be singular or plural.

[0141] 9. The "frequency domain unit" involved in this application may be a subcarrier, carrier, RB, frequency domain subband, BWP, etc. The "time domain unit" involved in this application may be an OFDM symbol, time slot, subframe, system frame, etc. The "resource unit" in this application may include at least one frequency domain unit and at least one time domain unit, and this application does not limit this.

[0142] First, a communication system to which the embodiments of the present application are applicable is described.

[0143] FIG1 is a schematic diagram of a communication system 100 applicable to an embodiment of the present application. As shown in FIG1 , the communication system 100 includes: a network device 110 and a terminal device 120 .

[0144] The terminal device 120 is a device with wireless transceiver functions, which can be referred to as user equipment (UE), access terminal, subscriber unit, user station, mobile station, remote station, remote terminal, mobile device, user terminal, wireless communication device, user agent or user device. The terminal device 120 may also be a satellite phone, a cellular phone, a smart phone, a wireless data card, a wireless modem, a machine type communication device, a cordless phone, a session initiation protocol (SIP) phone, a wireless local loop (WLL) station, a personal digital assistant (PDA), a customer-premises equipment (CPE), a smart point of sale (POS), a handheld device with wireless communication capabilities, a computing device or other processing device connected to a wireless modem, an in-vehicle device, a communication device carried on a high-altitude aircraft, a wearable device, a drone, a robot, a terminal in device-to-device (D2D) communication, a terminal in vehicle-to-everything (V2X), a virtual reality (VR) terminal device, an augmented reality (AR) terminal device, a wireless terminal in industrial control, a wireless terminal in self-driving, a remote medical device, or a similar device. This application does not limit the wireless terminals in medical, smart grid, transportation safety, smart city, smart home, or terminal devices in communication networks evolved after 5G.

[0145] The communication device used to implement the functions of the terminal device 120 can be a terminal device, or a device that can support the terminal device to implement the functions, such as a chip system. The device can be installed in the terminal device or used in conjunction with the terminal device. In this application, the chip system can be composed of a chip or include a chip and other discrete devices.

[0146] The network device 110 is a device with wireless transceiver functions, which is used to communicate with the terminal device 120. The network device 110 can be a node in the radio access network (RAN), which can be called a base station or a RAN node. It can be an evolved Node B (eNB or eNodeB) of long term evolution (LTE); or a base station of a 5G network such as a gNodeB (gNB) or a base station in a public land mobile network (PLMN) evolved after 5G, a broadband network gateway (BNG), an aggregation switch, or a third generation partnership project (3GPP) access device.

[0147] The RAN can be configured as a RAN defined by the 3GPP protocol, an open radio access network (O-RAN), or a cloud radio access network (C-RAN). The network device 110 can also include various forms of base stations, such as macro base stations, micro base stations (also known as small stations), relay stations, transmission points (transmitting and receiving points, TRP), transmission points (transmitting points, TP), mobile switching centers, and devices that perform base station functions in device-to-device (D2D), vehicle-to-everything (V2X), and machine-to-machine (M2M) communications, network devices in non-terrestrial networks (NTN), etc., without specific limitation.

[0148] The network device 110 may also include network elements or modules that implement some functions of the base station, for example, one or more of the following: a centralized unit (CU), a distributed unit (DU), or a radio unit (RU). Optionally, the CU can be further separated into a CU-control plane (CP) and a CU-user plane (UP). The functions of the CU and DU can be implemented by different network elements, or simultaneously by the baseband unit (BBU) of the base station. The function of the RU can be implemented by the radio frequency equipment of the base station. For example, the radio frequency equipment of the base station may be a remote radio unit (RRU), a pico remote radio unit (pRRU), an active antenna unit (AAU), or other units, modules or devices with radio frequency processing functions. The communication interface protocol between the BBU and the radio frequency equipment can be a common public radio interface (CPRI) interface protocol, an enhanced common public radio interface (eCPRI) interface protocol, or a fronthaul interface protocol between the DU and RU in the O-RAN system, etc., without limitation.

[0149] The communication device used to implement the functions of the network device 110 can be a network device, or a device that can support the network device to implement the functions, such as a chip system. The device can be installed in the network device or used in conjunction with the network device. The chip system in the embodiment of the present application can be composed of a chip, or it can include a chip and other discrete devices.

[0150] In the embodiment of the present application, the communication system 100 may be the following systems: long term evolution (LTE) system, LTE frequency division duplex (FDD) system, LTE time division duplex (TDD) system, universal mobile telecommunication system (UMTS), 5G system, 6G system, inter-satellite communication, satellite communication and other NTN systems. Among them, the satellite communication system includes a satellite base station and a terminal device. The satellite base station provides communication services for the terminal device. The satellite base station can also communicate with the ground base station. The satellite can be used as a base station or as a terminal device. Among them, the satellite can refer to non-ground base stations or non-ground devices such as drones, hot air balloons, low-orbit satellites, medium-orbit satellites, and high-orbit satellites.

[0151] The communication system 100 may also be a terrestrial cellular communication system, a high altitude platform station (HAPS) communication system, a V2X system, an integrated access and backhaul (IAB) system, and a reconfigurable intelligent surface (RIS) communication system, etc., without limitation.

[0152] The following is a brief introduction to the relevant concepts involved in the technical solution of this application:

[0153] 1. Sounding Reference Signal (SRS)

[0154] SRS is an uplink reference signal sent by a terminal device to a network device. After the network device receives the SRS from the terminal device, it can obtain the uplink channel information from the terminal device to the network device based on the SRS. Furthermore, if the uplink channel and the downlink channel have channel reciprocity, the network device can also obtain the downlink channel information from the network device to the terminal device based on the SRS. After the network device obtains the downlink channel information and / or uplink channel information, it can perform resource scheduling or precoding processing for data transmission on the terminal device based on the downlink channel information and / or the uplink channel information. The SRS reference signal can be a reference signal that is sent periodically or a reference signal that is sent non-periodically. The SRS reference signal can be sent on the corresponding OFDM symbol and frequency domain subcarrier based on the configuration of the network device.

[0155] 2. Channel State Information Reference Signal (CSI-RS)

[0156] CSI-RS is a downlink reference signal sent by a network device to a terminal device. After the terminal device receives the CSI-RS from the network device, it can obtain the downlink channel information from the network device to the terminal device based on the CSI-RS. Generally speaking, the terminal device reports the downlink channel information through CSI. Among them, CSI may include precoding matrix indicator (PMI), rank indicator (RI), channel quality information (CQI), etc. After receiving the downlink channel information from the terminal device, the network device performs resource scheduling or precoding processing for data transmission on the terminal device. The CSI-RS reference signal can be a reference signal sent periodically or a reference signal sent non-periodically. The CSI-RS reference signal can be sent on the corresponding OFDM symbol and frequency domain subcarrier based on the configuration of the network device.

[0157] In FDD systems, the uplink and downlink spectrums are asymmetric, so the uplink and downlink channels lack channel reciprocity. Network devices measure downlink channels by sending CSI-RS signals to terminal devices. The resource overhead of transmitting CSI-RS signals by network devices is related to the number of antennas used to transmit CSI-RS signals. With the future development of massive multiple input multiple output (MIMO) technology, the antenna size of network devices will further increase, and the resource overhead of CSI-RS signals will also increase exponentially. In TDD systems, the uplink and downlink channel spectrums are symmetric, so the uplink and downlink channels exhibit channel reciprocity. Network devices can measure downlink channels by receiving SRS signals from terminal devices. The resource overhead of transmitting SRS signals by terminal devices is related to the number of terminal devices to be measured and the number of antennas on the terminal devices. As the number of terminal devices increases in the future, the resource overhead of SRS signals will also increase exponentially. Therefore, how to effectively control the resource overhead of reference signals during channel measurement is an urgent problem that needs to be solved.

[0158] The following describes the channel measurement method according to an embodiment of the present application in conjunction with the accompanying drawings.

[0159] FIG2 is a schematic diagram of the interactive flow of a channel measurement method 200 according to an embodiment of the present application. The method shown in FIG2 can be executed by the terminal device 120 and the network device 110, or by modules and / or devices (e.g., chips or integrated circuits) with corresponding functions installed in the terminal device 120 and the network device 110, without limitation. The following description will be made using the terminal device 120 and the network device 110 as an example. As shown in FIG2 , the method 200 includes:

[0160] In step S220 , the network device obtains a measurement result of the first reference signal.

[0161] Specifically, the first reference signal is used to measure first channel parameters of an uplink channel and a downlink channel, where the uplink channel and the downlink channel are channels for communication between the terminal device and the network device.

[0162] The measurement result of the first reference signal corresponds to the first channel parameter.

[0163] Specifically, the first channel parameter includes at least one of the following information:

[0164] Spatial domain correlation, frequency domain correlation, time domain correlation, index of at least one beam or spatial domain basis vector corresponding to the terminal device, index of at least one delay path or frequency domain basis vector corresponding to the terminal device, etc. Among them, spatial domain correlation includes spatial domain correlation matrix, angular power spectrum, etc., frequency domain correlation includes frequency domain correlation matrix, delay power spectrum, etc., and time domain correlation includes time domain correlation matrix, Doppler power spectrum, etc.

[0165] It should be understood that the above-mentioned first channel parameters are the same for the uplink channel and the downstream channel.

[0166] The network device may obtain the measurement result of the first reference signal in the following two ways.

[0167] The first method includes: step S210, the network device determines third configuration information.

[0168] In step S212, the network device sends a first reference signal according to the third configuration information. Correspondingly, the terminal device receives the first reference signal from the network device.

[0169] Specifically, the third configuration information includes at least one of the following information about the network device sending the first reference signal:

[0170] The type of the first reference signal; the frequency domain density or frequency domain unit interval of the first reference signal; the time domain density or time domain period or time domain unit interval of the first reference signal; the frequency domain resource position of the reference signal (such as the starting frequency domain position of the first reference signal, the frequency domain unit length or frequency domain subband length corresponding to the first reference signal); the time domain resource position of the first reference signal (such as the starting time domain unit position of the first reference signal, the time domain unit length corresponding to the first reference signal), etc.

[0171] In step S214, the terminal device sends the measurement result of the first reference signal to the network device. Correspondingly, the network device receives the measurement result of the first reference signal from the terminal device.

[0172] The measurement result of the first reference signal corresponds to the first channel parameter. Since the first channel parameter of the uplink channel and the downlink channel is the same, the network device can obtain the uplink channel information and the downlink channel information accordingly.

[0173] For example, the first reference signal in the first embodiment may be a CSI-RS. Alternatively, it may be another type of downlink reference signal. The first reference signal may be transmitted on one or more corresponding time domain units and / or one or more frequency domain units based on the configuration of the network device.

[0174] The second method includes: step S210, the network device determines fourth configuration information.

[0175] Specifically, the fourth configuration information includes at least one of the following information about the terminal device sending the first reference signal:

[0176] The type of the first reference signal sent, the frequency domain density or frequency domain unit interval of sending the first reference signal, the time domain density or time domain period or time domain unit interval of sending the first reference signal, the frequency domain resource position of sending the first reference signal (for example, the starting frequency domain position of sending the first reference signal, the frequency domain unit length or frequency domain subband length corresponding to the first reference signal), the time domain resource position of sending the first reference signal (for example, the starting time domain unit position of sending the first reference signal, the time domain unit length corresponding to the first reference signal), etc.

[0177] Step S216: The network device sends fourth configuration information to the terminal device.

[0178] In step S218, the terminal device sends a first reference signal to the network device according to the fourth configuration information. Accordingly, the network device receives the first reference signal from the terminal device and obtains a measurement result of the first reference signal according to the received first reference signal.

[0179] The measurement result of the first reference signal corresponds to the first channel parameter. Since the first channel parameter of the uplink channel and the downlink channel is the same, the network device can obtain the uplink channel information and the downlink channel information accordingly.

[0180] For example, the first reference signal in the second embodiment may be an SRS. Alternatively, it may be another type of uplink reference signal. The first reference signal may be transmitted on one or more corresponding time domain units and / or one or more frequency domain units based on the configuration of the network device.

[0181] Currently, various communication systems support flexible configuration of uplink and downlink resources. Since the configuration of uplink resources may be different from that of downlink resources, uplink and downlink channels may interfere with each other. This application proposes a method to effectively control the interference generated by uplink and downlink channels, as described below:

[0182] Specifically, the third configuration information is used to configure at least one set of third resource units that carry the first reference signal, where each third resource unit includes N third resource units. The fourth configuration information is used to configure at least one set of fourth resource units that carry the first reference signal, where each fourth resource unit includes N fourth resource units, as shown in FIG3 . A preset second offset is provided between the N third resource units and the N fourth resource units.

[0183] Exemplarily, FIG3 (a) shows N third resource units included in a third resource unit set and N fourth resource units included in a fourth resource unit set of a TDD communication system. At least one third resource unit set is configured in the downlink (DL) time slot for carrying a network device to send a first reference signal to a terminal device, and only one of the third resource unit sets is shown in FIG3 (a); at least one fourth resource unit set is configured in the uplink (UL) time slot for carrying a terminal device to send a first reference signal to a network device, and only one of the fourth resource unit sets is shown in FIG3 (a). There is a preset second offset in the time domain between the N third resource units included in the third resource unit set and the N fourth resource units included in the fourth resource unit set. Specifically, as shown in FIG3 (a), one square corresponds to a frequency domain unit and a time domain unit, where the frequency domain unit is a subcarrier and the time domain unit is an OFDM symbol. A third resource unit set corresponds to a resource block consisting of 28 frequency domain units and 7 OFDM symbols in the time domain (a total of 196 resource units). The third resource unit set includes N=18 third resource units (black squares) mapped to the first reference signal. Similarly, a fourth resource unit set corresponds to a resource block consisting of 28 frequency domain units and 7 OFDM symbols in the time domain (a total of 196 resource units). The fourth resource unit set includes N=18 fourth resource units (black squares) mapped to the first reference signal. The third resource unit set and the fourth resource unit set contain the same number of frequency domain units, and the third resource unit set and the fourth resource unit set also contain the same number of time domain units. The time domain positions and frequency domain positions of the N third resource units mapped in the third resource unit set are the same as the time domain positions and frequency domain positions of the N fourth resource units mapped in the fourth resource unit set. The above-mentioned preset second offset can be the interval or offset value between the time domain unit (such as time slot) where the N third resource units are located and the time domain unit (such as time slot) where the N fourth resource units are located. The preset second offset may be a value configured by the network device or a value predefined by the protocol.

[0184] Alternatively, the preset second offset between the N third resource units and the N fourth resource units in the time domain can also be understood as the mapping pattern of the N third resource units in the DL time slot is the same as the mapping pattern of the N fourth resource units in the UL time slot.

[0185] Alternatively, the preset second offset in the time domain between the N third resource units and the N fourth resource units can also be understood as the N third resource units of the DL time slot being shifted by the second offset in the time domain and overlapping with the N fourth resource units of the UL time slot.

[0186] In one implementation, there is a preset second offset in the frequency domain between the N third resource units and the N fourth resource units, which can also be understood as the N third resource units being shifted by the second offset in the frequency domain and overlapping with the N fourth resource units. The preset second offset can be the interval or offset value between the frequency domain unit (such as a subcarrier or RB) where the N third resource units are located and the frequency domain unit (such as a subcarrier or RB) where the N fourth resource units are located. The preset second offset can be a value configured by the network device or a value predefined by the protocol.

[0187] The indexes of the N third resource units in the third resource unit set are the same as the indexes of the N fourth resource units in the fourth resource unit set. Alternatively, the indexes of the N third resource units in the at least one third resource unit set are the same as the indexes of the N fourth resource units in the at least one fourth resource unit set.

[0188] For example, as shown in (b) of Figure 3, if the third resource unit set corresponding to the above-mentioned N third resource units is an RB#1, the fourth resource unit set corresponding to the above-mentioned N fourth resource units is an RB#2. Each RB includes 12 subcarriers in the frequency domain (respectively recorded as indexes 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, and 11) and 7 OFDM symbols in the time domain (respectively recorded as indexes A, B, C, D, E, F, and G). The 8 resource units used to send the first reference signal for downlink in RB#1 occupy subcarriers 1, 3, 5, 7, 9, and 11 in the frequency domain and OFDM symbols B, D, and F in the time domain. Similarly, the 8 resource units used to send the first reference signal for uplink in RB#2 occupy subcarriers 1, 3, 5, 7, 9, and 11 in the frequency domain and OFDM symbols B, D, and F in the time domain. Assuming that the frequency domain starting positions of RB#1 and RB#2 are subcarrier index 0 and the time domain starting positions are OFDM symbols indexed A, assuming that resource unit #1 in RB#1 occupies subcarrier index 5 in the frequency domain and OFDM symbols indexed B in the time domain, and resource unit #2 in RB#2 occupies subcarrier index 5 in the frequency domain and OFDM symbols indexed B in the time domain, as examples, will be used for illustration: resource unit #1 has a frequency domain offset of 5 subcarriers relative to the frequency domain starting position and a time domain offset of 1 OFDM symbol relative to the time domain starting position; resource unit #2 has a frequency domain offset of 5 subcarriers relative to the frequency domain starting position and a time domain offset of 1 OFDM symbol relative to the time domain starting position. In other words, resource unit #1 occupies the same resource position in RB#1 as resource unit #2 in RB#2. The other corresponding resource units in RB#1 and RB#2 are similar and will not be further described here.

[0189] Among them, the above-mentioned RB#1 can be the above-mentioned third resource unit set, the 8 resource units in the above-mentioned RB#1 can be the above-mentioned N third resource units, the above-mentioned RB#2 can be the above-mentioned fourth resource unit set, and the 8 resource units in the above-mentioned RB#2 can be the above-mentioned N fourth resource units, and this application does not limit it.

[0190] Exemplarily, FIG3(c) shows N third resource units included in a third resource unit set and N fourth resource units included in a fourth resource unit set of an FDD communication system. At least one third resource unit set is configured in the DL spectrum for carrying a first reference signal sent by a network device to a terminal device, and only two of the third resource unit sets are shown in FIG3(c); at least one fourth resource unit set is configured in the UL spectrum for carrying a first reference signal sent by a terminal device to a network device, and only one of the fourth resource unit sets is shown in FIG3(c). The N third resource units included in the third resource unit set and the N fourth resource units included in the fourth resource unit set have a preset second offset in the frequency domain. Specifically, as shown in FIG3(c), one square corresponds to one frequency domain unit and one time domain unit, wherein the frequency domain unit is a subcarrier and the time domain unit is an OFDM symbol. One third resource unit set corresponds to a resource block consisting of 8 frequency domain units in the frequency domain and 7 OFDM symbols in the time domain (a total of 56 resource units). The third resource unit set includes N=6 third resource units (black squares) mapped to the first reference signal. Similarly, a fourth resource unit set corresponds to a resource block consisting of 8 frequency domain units in the frequency domain and 7 OFDM symbols in the time domain (a total of 56 resource units). The fourth resource unit set includes N=6 fourth resource units (black squares) mapped to the first reference signal. The third resource unit set and the fourth resource unit set contain the same number of frequency domain units, and the third resource unit set and the fourth resource unit set contain the same number of time domain units. The time domain positions and frequency domain positions of the N third resource units mapped in the third resource unit set are the same as the time domain positions and frequency domain positions of the N fourth resource units mapped in the fourth resource unit set. The above-mentioned preset second offset can be the interval or offset value between the frequency domain units (such as subcarriers or RBs) where the N third resource units are located and the frequency domain units (such as subcarriers or RBs) where the N fourth resource units are located. The preset second offset can be a value configured by the network device or a value predefined by the protocol.

[0191] Alternatively, the preset second offset between the N third resource units and the N fourth resource units in the frequency domain can also be understood as the mapping pattern of the N third resource units of the DL spectrum is the same as the mapping pattern of the N fourth resource units of the UL spectrum.

[0192] Alternatively, the preset second offset in the frequency domain between the N third resource units and the N fourth resource units can also be understood as the N third resource units of the DL spectrum overlapping with the N fourth resource units of the UL spectrum after being shifted by the second offset in the frequency domain.

[0193] In one implementation, there is a preset second offset in the time domain between the N third resource units and the N fourth resource units, which can also be understood as the N third resource units being shifted by the second offset in the time domain and overlapping with the N fourth resource units. The preset second offset can be the interval or offset value between the time domain unit (such as a time slot) where the N third resource units are located and the time domain unit (such as a time slot) where the N fourth resource units are located. The preset second offset can be a value configured by the network device or a value predefined by the protocol.

[0194] The indexes of the N third resource units in the third resource unit set are the same as the indexes of the N fourth resource units in the fourth resource unit set. Alternatively, the indexes of the N third resource units in the at least one third resource unit set are the same as the indexes of the N fourth resource units in the at least one fourth resource unit set.

[0195] In the above method, the mapping rules for uplink and downlink resources are the same. By aligning the downlink and uplink resources, interference between the uplink and downlink channels can be better controlled. Furthermore, the above method can use less signaling overhead to instruct the terminal device on how to send the uplink first reference signal and how to receive the downlink first reference signal.

[0196] As mentioned above, the first reference signal can measure the spatial domain correlation, frequency domain correlation, and time domain correlation with the reciprocity of the uplink channel and the downlink channel. Generally speaking, the number of antenna ports for sending the first reference signal on different resource units is different. With the development of massive MIMO technology in the future, the antenna scale of network equipment will further increase, and the resource overhead of sending reference signals will also increase exponentially. This application proposes a method to reduce the resource overhead of sending reference signals, as shown in Figure 4:

[0197] FIG4 illustrates the reference signal transmission of a resource unit set as an example, but it should be understood that the resource unit set may be the third resource unit set or the fourth resource unit set, or the first resource unit set or the second resource unit set described below, and this application does not limit this. Each resource unit set configured by the network device transmits a reference signal in the manner shown in FIG4 . Assuming that the network device has 64 antenna ports and the terminal device has 4 antenna ports, this application does not limit the number of antenna ports of the network device and the terminal device.

[0198] When measuring spatial correlation, the network device transmits a first reference signal on any one of the N third resource units via 64 antenna ports. Alternatively, the terminal device transmits a first reference signal on any one of the N fourth resource units via 4 antenna ports. Exemplarily, the arbitrary resource unit may be the resource unit indicated in "Obtaining Spatial Correlation Characteristics" in FIG. 4 .

[0199] When measuring frequency domain correlation, the network device sends a first reference signal through one of the 64 antenna ports, and the first reference signal is carried on multiple resource units in the same time domain resources among the N third resource units. Alternatively, the terminal device sends a first reference signal through one of the four antenna ports, and the first reference signal is carried on multiple resource units in the same time domain resources among the N fourth resource units. Exemplarily, the multiple resource units can be the resource units indicated by "Obtaining Frequency Domain Correlation Characteristics" in Figure 4.

[0200] When measuring time domain correlation, the network device sends a first reference signal through one of the 64 antenna ports, and the first reference signal is carried on multiple resource units in the same frequency domain resources in the N third resource units. Alternatively, the terminal device sends a first reference signal through one of the four antenna ports, and the first reference signal is carried on multiple resource units in the same frequency domain resources in the N fourth resource units. Exemplarily, the multiple resource units can be the resource units indicated by "Obtaining Time Domain Correlation Characteristics" in Figure 4.

[0201] The time domain correlation features and frequency domain correlation features in the above method are the same for different antenna ports, so one antenna port is required to send a reference signal for measurement, which can reduce the overhead of the first reference signal.

[0202] In step S220 , the network device obtains a measurement result of the first reference signal by using the first method or the second method.

[0203] In step S222, the network device determines first configuration information and second configuration information based on the measurement result of the first reference signal. The first configuration information is used to configure a downlink reference signal for measuring a downlink channel, and the second configuration information is used to configure an uplink reference signal for measuring an uplink channel.

[0204] Specifically, the first configuration information includes at least one of the following information for the network device to send a downlink reference signal:

[0205] The type of downlink reference signal, the frequency domain density or frequency domain unit interval of the downlink reference signal, the time domain density or time domain period or time domain unit interval of the downlink reference signal, the frequency domain resource position of the downlink reference signal (for example, the starting frequency domain position of the downlink reference signal, the frequency domain unit length or frequency domain subband length corresponding to the downlink reference signal), the time domain resource position of the downlink reference signal (for example, the starting time domain unit position of the downlink reference signal, the time domain unit length corresponding to the downlink reference signal), etc.

[0206] Specifically, the second configuration information includes at least one of the following information about the terminal device sending an uplink reference signal:

[0207] The type of uplink reference signal, the frequency domain density or frequency domain unit interval of the uplink reference signal, the time domain density or time domain period or time domain unit interval of the uplink reference signal, the frequency domain resource position of the uplink reference signal (for example, the starting frequency domain position of the uplink reference signal, the frequency domain unit length or frequency domain subband length corresponding to the uplink reference signal), the time domain resource position of the uplink reference signal (for example, the starting time domain unit position for sending the uplink reference signal, the time domain unit length corresponding to the uplink reference signal), etc.

[0208] Specifically, the first configuration information is used to configure at least one first resource unit set that carries a downlink reference signal, each first resource unit set including M first resource units, and the second configuration information is used to configure at least one second resource unit set that carries an uplink reference signal, each second resource unit set including M second resource units, as shown in Figure 5. A preset first offset is provided between the M first resource units and the M second resource units.

[0209] Exemplarily, FIG5(a) shows M first resource units included in a first resource unit set and M second resource units included in a second resource unit set of a TDD communication system. At least one first resource unit set for carrying a downlink reference signal sent by a network device to a terminal device is configured in the DL time slot, and only three first resource unit sets are shown in FIG5(a); at least one second resource unit set for carrying a first reference signal sent by a terminal device to a network device is configured in the UL time slot, and only three second resource unit sets are shown in FIG5(a). There is a preset first offset in the time domain between the M first resource units included in the first resource unit set and the M second resource units included in the second resource unit set. Specifically, as shown in FIG5(a), one square corresponds to one frequency domain unit and one time domain unit, wherein the frequency domain unit is a subcarrier and the time domain unit is an OFDM symbol. One first resource unit set corresponds to a resource block consisting of 28 frequency domain units in the frequency domain and 4 OFDM symbols in the time domain (a total of 112 resource units). The first resource unit set includes M=7 first resource units (black squares) that map downlink reference signals. Similarly, a second resource unit set corresponds to a resource block consisting of 28 frequency domain units in the frequency domain and 4 OFDM symbols in the time domain (a total of 112 resource units). The second resource unit set includes M=7 second resource units (black squares) that map uplink reference signals. The first resource unit set and the second resource unit set contain the same number of frequency domain units, and the first resource unit set and the second resource unit set contain the same number of time domain units. The time domain positions and frequency domain positions of the M first resource units mapped in the first resource unit set are the same as the time domain positions and frequency domain positions of the M second resource units mapped in the second resource unit set. The above-mentioned preset first offset can be the interval or offset value between the time domain units (such as time slots) where the M first resource units are located and the time domain units (such as time slots) where the M second resource units are located. The preset first offset can be a value configured by the network device or a value predefined by the protocol.

[0210] Alternatively, the preset first offset in the time domain may also be understood as the mapping pattern of the M first resource units in the DL time slot being the same as the mapping pattern of the M second resource units in the UL time slot.

[0211] Alternatively, the preset first offset in the time domain between the M first resource units and the M second resource units can also be understood as the M first resource units of the DL time slot being shifted by the first offset in the time domain and overlapping with the M second resource units of the UL time slot.

[0212] In one implementation, there is a preset first offset in the frequency domain between the M first resource units and the M second resource units, which can also be understood as the M first resource units being shifted by the first offset in the frequency domain and overlapping with the M second resource units. The preset first offset can be the interval or offset value between the frequency domain unit (such as a subcarrier or RB) where the M first resource units are located and the frequency domain unit (such as a subcarrier or RB) where the M second resource units are located. The preset first offset can be a value configured by a network device or a value predefined by a protocol.

[0213] The indexes of the M first resource units in the first resource unit set are the same as the indexes of the M second resource units in the second resource unit set. Alternatively, the indexes of the M first resource units in the at least one first resource unit set are the same as the indexes of the M second resource units in the at least one second resource unit set.

[0214] Exemplarily, FIG5(b) shows M first resource units included in a first resource unit set and M second resource units included in a second resource unit set of an FDD communication system. At least one first resource unit set for carrying a first reference signal sent by a network device to a terminal device is configured in the DL spectrum, and only two of the first resource unit sets are shown in FIG5(b); at least one second resource unit set for carrying a first reference signal sent by a terminal device to a network device is configured in the UL spectrum, and only one of the second resource unit sets is shown in FIG5(b). There is a preset first offset between the M first resource units and the M second resource units in the frequency domain. Specifically, as shown in FIG5(b), one square corresponds to one frequency domain unit and one time domain unit, wherein the frequency domain unit is a subcarrier and the time domain unit is an OFDM symbol. One first resource unit set corresponds to a resource block consisting of 8 frequency domain units in the frequency domain and 4 OFDM symbols in the time domain (a total of 32 resource units). The first resource unit set includes M=2 first resource units (black squares) that map the downlink reference signal. Similarly, a second resource unit set corresponds to a resource block consisting of 8 frequency domain units in the frequency domain and 4 OFDM symbols in the time domain (a total of 32 resource units). The second resource unit set includes M=2 second resource units (black squares) mapping the uplink reference signal. The first resource unit set and the second resource unit set contain the same number of frequency domain units, and the first resource unit set and the second resource unit set contain the same number of time domain units. The time domain position and frequency domain position of the M first resource units mapped in the first resource unit set are the same as the time domain position and frequency domain position of the M second resource units mapped in the second resource unit set. The above-mentioned preset first offset can be the interval or offset value between the frequency domain units (such as subcarriers or RBs) where the M first resource units are located and the frequency domain units (such as subcarriers or RBs) where the M second resource units are located. The preset first offset can be a value configured by the network device or a value predefined by the protocol.

[0215] Alternatively, the presence of a preset first offset in the frequency domain between the M first resource units and the M second resource units can also be understood as the mapping pattern of the M first resource units of the DL spectrum being the same as the mapping pattern of the M second resource units of the UL spectrum.

[0216] Alternatively, the preset first offset between the M first resource units and the M second resource units in the frequency domain can also be understood as the M first resource units of the DL spectrum being shifted by the first offset in the frequency domain and overlapping with the M second resource units of the UL spectrum.

[0217] In one implementation, there is a preset first offset in the frequency domain between the M first resource units and the M second resource units, which can also be understood as the M first resource units being shifted by the first offset in the frequency domain and overlapping with the M second resource units. The preset first offset can be the interval or offset value between the time domain unit (such as a time slot) where the M first resource units are located and the time domain unit (such as a time slot) where the M second resource units are located. The preset first offset can be a value configured by a network device or a value predefined by a protocol.

[0218] The indexes of the M first resource units in the first resource unit set are the same as the indexes of the M second resource units in the second resource unit set. Alternatively, the indexes of the M first resource units in the at least one first resource unit set are the same as the indexes of the M second resource units in the at least one second resource unit set.

[0219] In the above method, the mapping rules for uplink and downlink resources are the same. By aligning the downlink and uplink resources, interference between the uplink and downlink channels can be better controlled. Furthermore, the above method can use less signaling overhead to instruct terminal devices on how to send uplink reference signals and how to receive downlink reference signals.

[0220] In addition, since the first channel parameter of the channel measured by the first reference signal is slowly varying, while the small-scale characteristics of the channel measured by the uplink reference signal and the downlink reference signal are rapidly varying, the first configuration information of the present application can configure the transmission period of the downlink reference signal to be smaller than the transmission period of the first reference signal, and / or, the second configuration information of the present application can configure the transmission period of the uplink reference signal to be smaller than the transmission period of the first reference signal, as shown in Figures 5(a) and 5(b). This configuration can also reduce the resource overhead of the reference signal.

[0221] Alternatively, the third configuration information and the fourth configuration information of the present application can configure the long-period transmission of the first reference signal, the first configuration information of the present application can configure the short-period transmission of the above-mentioned downlink reference signal, and the second configuration information of the present application can configure the short-period transmission of the above-mentioned uplink reference signal, as shown in Figure 5 (a) and Figure 5 (b).

[0222] The network device determining the first configuration information and the second configuration information according to the measurement result of the first reference signal may specifically be:

[0223] When the measurement result of the first reference signal indicates that the frequency domain correlation between the uplink channel and the downlink channel is greater than the first threshold, it indicates that the frequency domain correlation between the uplink channel and the downlink channel is strong and that the uplink channel and the downlink channel vary slowly in the frequency domain. Therefore, the comb-tooth degree of the frequency domain position for sending the downlink reference signal configured by the first configuration information is large (e.g., 4). In other words, the frequency domain distance between any two adjacent resource units in the same time domain resource among the M first resource units configured by the first configuration information is greater than the third offset, as shown in Figure 6. Conversely, when the measurement result of the first reference signal indicates that the frequency domain correlation between the uplink channel and the downlink channel is less than the first threshold, it indicates that the frequency domain correlation between the uplink channel and the downlink channel is weak and that the uplink channel and the downlink channel vary rapidly in the frequency domain. Therefore, the comb-tooth degree of the frequency domain position for sending the downlink reference signal configured by the first configuration information is small (e.g., 2). In other words, the frequency domain distance between any two adjacent resource units in the same time domain resource among the M first resource units configured by the first configuration information is less than the third offset, as shown in Figure 6.

[0224] Specifically, the current frequency domain comb tooth degree is usually set to 2, 4, or 8.

[0225] Alternatively, when the measurement result of the first reference signal indicates that the frequency domain correlation between the uplink channel and the downlink channel is greater than a first threshold, the comb degree of the frequency domain position for sending the downlink reference signal configured by the first configuration information is 8; when the measurement result of the first reference signal indicates that the frequency domain correlation between the uplink channel and the downlink channel is less than the first threshold, but the frequency domain correlation between the uplink channel and the downlink channel is greater than a second threshold, the comb degree of the frequency domain position for sending the downlink reference signal configured by the first configuration information is 4; when the measurement result of the first reference signal indicates that the frequency domain correlation between the uplink channel and the downlink channel is less than the second threshold, but the frequency domain correlation between the uplink channel and the downlink channel is greater than a third threshold, the comb degree of the frequency domain position for sending the downlink reference signal configured by the first configuration information is 2. In other words, the frequency domain correlation between the uplink channel and the downlink channel can be associated with multiple thresholds, and the multiple thresholds can be associated with a comb degree in a certain frequency domain.

[0226] Similarly, as shown in FIG6 , at this time, the comb degree of the frequency domain position for sending the uplink reference signal configured by the second configuration information is also relatively small (for example, it may be 2).

[0227] When the measurement result of the first reference signal indicates that the time domain correlation between the uplink channel and the downlink channel is greater than the fourth threshold, it indicates that the time domain correlation between the uplink channel and the downlink channel is strong and that the uplink channel and the downlink channel vary slowly in the time domain. Therefore, the transmission period of the time domain location for sending the downlink reference signal configured by the first configuration information is relatively long (e.g., 4 time slots). In other words, the time domain distance between any two adjacent resource units in the same frequency domain resources among the M first resource units configured by the first configuration information is greater than the fourth offset, as shown in FIG6 . Conversely, when the measurement result of the first reference signal indicates that the time domain correlation between the uplink channel and the downlink channel is less than the second threshold, it indicates that the time domain correlation between the uplink channel and the downlink channel is weak and that the uplink channel and the downlink channel vary rapidly in the time domain. Therefore, the transmission period of the time domain location for sending the downlink reference signal configured by the first configuration information is relatively short (e.g., 3 time slots). In other words, the time domain distance between any two adjacent resource units in the same frequency domain resources among the M first resource units configured by the first configuration information is less than the fourth offset, as shown in FIG6 .

[0228] Alternatively, when the measurement result of the first reference signal is that the time domain correlation between the uplink channel and the downlink channel is greater than the fourth threshold, the transmission period of the time domain position for sending the downlink reference signal configured by the first configuration information is 8 time slots; when the measurement result of the first reference signal is that the time domain correlation between the uplink channel and the downlink channel is less than the fourth threshold, but the frequency domain correlation between the uplink channel and the downlink channel is greater than the fifth threshold, the transmission period of the time domain position for sending the downlink reference signal configured by the first configuration information is 4 time slots; when the measurement result of the first reference signal is that the time domain correlation between the uplink channel and the downlink channel is less than the fifth threshold, but the frequency domain correlation between the uplink channel and the downlink channel is greater than the sixth threshold, the transmission period of the time domain position for sending the downlink reference signal configured by the first configuration information is 2 time slots. In other words, the time domain correlation between the uplink channel and the downlink channel can also be associated with multiple thresholds, and the multiple thresholds can be mapped to a transmission period in a certain time domain.

[0229] Similarly, as shown in FIG6 , at this time, the transmission period of the time domain position for sending the uplink reference signal configured by the second configuration information is also relatively short (for example, it may be 3 time slots).

[0230] The frequency domain correlation may be a frequency domain correlation coefficient corresponding to an uplink channel or a downlink channel. In one implementation, the frequency domain correlation coefficient may be a correlation coefficient of a channel matrix corresponding to a frequency domain unit pair consisting of two frequency domain units, wherein the channel matrix may be a channel vector corresponding to a port or an antenna, or a channel coefficient corresponding to a pair of transceiver antenna ports or a pair of transceiver antennas.

[0231] Exemplarily, the channel matrices corresponding to the i-th frequency domain unit and the j-th frequency domain unit are expressed as h(i) and h(j), respectively. Then, the channel frequency domain correlation coefficient corresponding to the frequency domain unit pair consisting of the i-th frequency domain unit and the j-th frequency domain unit can be expressed as:

[0232] or

[0233] Where |h(i)| represents the modulus of h(i). If h(i) is a vector or matrix containing K elements, it can be expressed as h k (j) represents the kth element of h(i).

[0234] The frequency domain correlation coefficient may also be an average value, a maximum value, or a minimum value of correlation coefficients of channel matrices corresponding to multiple frequency domain unit pairs.

[0235] The above-mentioned frequency domain correlation can also be the maximum channel delay, channel delay spread, or channel average delay corresponding to the uplink channel or downlink channel, or other forms related to the power delay spectrum of the channel, such as the root mean square delay spread, maximum delay spread, etc.

[0236] For example, assuming that τ k 、a k and P(τ k ) represent the channel delay, amplitude, and power of the kth path of the channel, respectively. There are K paths in total, corresponding to indexes k=1,…,K. The maximum channel delay can be expressed as τ K The maximum delay spread of the channel can be expressed as τ K -τ1. The average delay can be obtained based on the first-order moment of the channel power delay spectrum. The root mean square delay spread can be obtained based on the second-order moment of the channel power delay spectrum in

[0237] The frequency domain correlation can also be other parameters corresponding to the uplink channel or downlink channel that reflect the frequency selective fading of the channel, such as the coherence bandwidth of the channel, for example

[0238] The time domain correlation may be a time domain correlation coefficient corresponding to an uplink channel or a downlink channel. In one implementation, the time domain correlation coefficient may be a correlation coefficient of a channel matrix corresponding to a time domain unit pair consisting of two time domain units, where the channel matrix may be a channel vector corresponding to a port or an antenna, or a channel coefficient corresponding to a pair of transceiver antenna ports or a pair of transceiver antennas.

[0239] Exemplarily, the channel matrices corresponding to the i-th time domain unit and the j-th time domain unit are expressed as h(i) and h(j), respectively. Then, the channel time domain correlation coefficient corresponding to the time domain unit pair consisting of the i-th time domain unit and the j-th time domain unit can be expressed as:

[0240] or

[0241] Where |h(i)| represents the modulus of h(i). If h(i) is a vector or matrix containing K elements, it can be expressed as h k (j) represents the kth element of h(i).

[0242] The above-mentioned time domain correlation coefficient may also be an average value, a maximum value or a minimum value of correlation coefficients of channel matrices corresponding to multiple time domain unit pairs.

[0243] The time-domain correlation may also be other forms of Doppler power spectrum correlation corresponding to the uplink or downlink channel, such as the channel's Doppler spread, Doppler frequency offset, Doppler spectrum bandwidth, etc. The frequency-domain correlation may also be other parameters corresponding to the uplink or downlink channel that reflect time-selective fading of the channel, such as the channel's coherence time, etc.

[0244] For example, assuming that the Doppler frequency shift is f m , where the Doppler frequency deviation is related to the moving speed and relative angle between the transceiver. The Doppler spectrum bandwidth is B d =2f m The channel coherence time can be expressed as In addition, the coherence time of the channel can be defined in other ways, such as

[0245] The above method can fully utilize the measurement result of the first reference signal to determine the first configuration information and the second configuration information, select the best resource carrying the reference signal, and minimize the reference signal overhead.

[0246] In step S224, the network device sends a downlink reference signal to the terminal device according to the first configuration information. Correspondingly, the terminal device receives the downlink reference signal from the network device.

[0247] In step S226, the terminal device sends the measurement result of the downlink reference signal to the network device. Correspondingly, the network device receives the measurement result of the downlink reference signal from the terminal device.

[0248] In step S228, the network device estimates the downlink channel according to the measurement result of the first channel parameter and the downlink reference signal.

[0249] Step S230: The network device sends second configuration information to the terminal device.

[0250] In step S232, the terminal device sends an uplink reference signal to the network device according to the second configuration information. Accordingly, the network device receives the uplink reference signal from the terminal device and obtains a measurement result of the uplink reference signal according to the received uplink reference signal.

[0251] Step S234: The network device estimates the uplink channel according to the first channel parameter and the measurement result of the uplink reference signal.

[0252] Finally, the device embodiment of the embodiment of the present application is introduced.

[0253] To implement the various functions of the method provided herein, both the terminal device 120 and the network device 110 may include hardware structures and / or software modules, and implement the aforementioned functions in the form of hardware structures, software modules, or a combination of hardware structures and software modules. Whether a particular one of the aforementioned functions is implemented in the form of hardware structures, software modules, or a combination of hardware structures and software modules depends on the specific application and design constraints of the technical solution.

[0254] 7 is a schematic block diagram of a communication device 700 according to an embodiment of the present application. The communication device 700 includes a processor 710 and a communication interface 720, which may be interconnected via a bus 730. The communication device 700 may be a network device 110 or a terminal device 120.

[0255] Optionally, the communication device 700 may further include a memory 740. The memory 740 includes, but is not limited to, random access memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM), or portable read-only memory (CD-ROM), and is used for related instructions and data.

[0256] The processor 710 may be one or more central processing units (CPUs). In the case where the processor 710 is a CPU, the CPU may be a single-core CPU or a multi-core CPU.

[0257] When the communication apparatus 700 is the terminal device 120 , illustratively, the communication apparatus 700 is configured to perform the following operations: sending a measurement result of the first reference signal to the network device 110 , etc.

[0258] When the communication apparatus 700 is the network device 110 , illustratively, the communication apparatus 700 is configured to perform the following operations: obtaining a measurement result of a first reference signal, etc.

[0259] The above contents are merely exemplary descriptions. When the communication apparatus 700 is the network device 110 / terminal device 120, it will be responsible for executing the methods or steps related to the network device 110 / terminal device 120 in the aforementioned method embodiments.

[0260] The above description is merely exemplary. For details, please refer to the contents of the above method embodiments. The implementation of each operation in FIG7 may also correspond to the corresponding description of the method embodiments shown in FIG2 to FIG6.

[0261] Figure 8 is a schematic block diagram of a communication device 800 according to an embodiment of the present application. Communication device 800 may be a network device 110 or a terminal device 120, or a chip or module within network device 110 or terminal device 120, configured to implement the methods described in the above embodiments. Communication device 800 includes a transceiver unit 810. The following provides an exemplary description of transceiver unit 810 and processing unit 820.

[0262] The transceiver unit 810 may include a transmitting unit and a receiving unit. The transmitting unit is used to perform the transmitting operation of the communication device, and the receiving unit is used to perform the receiving operation of the communication device. For ease of description, this embodiment of the application combines the transmitting unit and the receiving unit into a single transceiver unit. This is described here as a unified description and will not be repeated later.

[0263] When the communication apparatus 800 is the terminal device 120, illustratively, the transceiver unit 810 is configured to send the measurement result of the first reference signal to the network device 110, and the processing unit 820 is configured to determine the measurement result of the first reference signal according to the received first reference signal.

[0264] When the communication device 800 is the network device 110, illustratively, the transceiver unit 810 is used to receive a measurement result of a first reference signal from the terminal device 120, and the processing unit 820 is used to determine first configuration information and second configuration information, etc. according to the measurement result of the first reference signal.

[0265] The above contents are merely exemplary descriptions. When the communication apparatus 800 is the network device 110 / terminal device 120, it will be responsible for executing the methods or steps related to the network device 110 / terminal device 120 in the aforementioned method embodiments.

[0266] Optionally, the communication device 800 further includes a storage unit 830, which is used to store a program or code for executing the aforementioned method.

[0267] The device embodiments shown in Figures 7 and 8 are used to implement the contents described in Figures 2 to 6. The specific execution steps and methods of the devices shown in Figures 7 and 8 can refer to the contents described in the above method embodiments.

[0268] 9 is a schematic block diagram of a communication device 900 according to an embodiment of the present application. The communication device 900 is used to implement the functions of the network device 110 / terminal device 120. The communication device 900 may be a chip in the network device 110 / terminal device 120.

[0269] Communication device 900 includes an input / output interface 920 and a processor 910. The input / output interface 920 may be an input / output circuit. The processor 910 may be a signal processor, a chip, or other integrated circuit capable of implementing the method of the present application. The input / output interface 920 is used for inputting or outputting signals or data.

[0270] For example, when the communication apparatus 900 is the terminal device 120, the input / output interface 920 is configured to send the measurement result of the first reference signal to the network device 110. The processor 910 is configured to determine the measurement result of the first reference signal according to the received first reference signal.

[0271] For example, the communication apparatus 900 is the network device 110, and the input / output interface 920 is configured to receive a measurement result of a first reference signal from the terminal device 120. The processor 910 is configured to determine first configuration information and second configuration information according to the measurement result of the first reference signal.

[0272] In one possible implementation, the processor 910 implements the functions implemented by the network device or the terminal device by executing instructions stored in the memory.

[0273] Optionally, the communication device 900 further includes a memory.

[0274] Optionally, the processor and memory are integrated together.

[0275] Optionally, the memory is outside the communication device 900 .

[0276] In one possible implementation, the processor 910 may be a logic circuit that inputs / outputs messages or signals through the input / output interface 920. The logic circuit may be a signal processor, a chip, or other integrated circuit that can implement the method of the embodiment of the present application.

[0277] The above description of the communication device 900 is only an exemplary description. The communication device 900 can be used to execute the method described in the above embodiment. For specific content, please refer to the description of the above method embodiment, which will not be repeated here.

[0278] The present application also provides a chip, including a processor, for calling and executing instructions stored in a memory from the memory, so that a communication device equipped with the chip executes the methods in the above examples.

[0279] The present application also provides a chip, comprising: an input interface, an output interface, and a processor, wherein the input interface, the output interface, and the processor are connected via an internal connection path, and the processor is configured to execute code in a memory. When the code is executed, the processor is configured to execute the methods in the above examples. Optionally, the chip also includes a memory, which is configured to store computer programs or code.

[0280] The present application also provides a processor for coupling with a memory, and for executing the methods and functions involving a network device or a terminal device in any of the above embodiments.

[0281] The present application provides a computer program product comprising instructions. When the computer program product is run on a computer, the method of the aforementioned embodiment is implemented.

[0282] The present application also provides a computer program. When the computer program is executed in a computer, the method of the aforementioned embodiment is implemented.

[0283] The present application also provides a computer-readable storage medium, which stores a computer program. When the computer program is executed by a computer, the method described in the above embodiment is implemented.

[0284] 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.

[0285] 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.

[0286] In the several embodiments provided in this application, the disclosed systems, devices, and methods can be implemented in other ways. For example, the device embodiments described above are only schematic. For example, the division of units is only 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.

[0287] 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 the units may be selected according to actual needs to achieve the purpose of the technical solutions of the embodiments of the present application.

[0288] 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.

[0289] If the function is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the embodiment 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 network device, etc.) to execute all or part of the steps of each method 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 ROM, a RAM, a magnetic disk, or an optical disk.

[0290] The above description is merely a specific embodiment of the present application, but the scope of protection of the embodiments 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 the embodiments of the present application should be included in the scope of protection of the embodiments of the present application. Therefore, the scope of protection of the present application should be based on the scope of protection of the claims.

Claims

1. A channel measurement method, characterized in that: The method comprises: The network device obtains a measurement result of a first reference signal, where the first reference signal is used to measure a first channel parameter of an uplink channel and a downlink channel, where the uplink channel and the downlink channel are channels for communication between a terminal device and the network device; The network device determines first configuration information and second configuration information according to the measurement result of the first reference signal, the first configuration information is used to configure the downlink reference signal for measuring the downlink channel, and the second configuration information is used to configure the uplink reference signal for measuring the uplink channel.

2. The method according to claim 1, characterized in that The first configuration information is used to configure at least one first resource unit set carrying the downlink reference signal, each first resource unit set includes M first resource units, and the second configuration information is used to configure at least one second resource unit set carrying the uplink reference signal, each second resource unit set includes M second resource units, and there is a preset first offset between the M first resource units and the M second resource units.

3. The method according to claim 1 or 2, characterized in that: The network device acquiring a measurement result of the first reference signal includes: The network device determines third configuration information; The network device sends the first reference signal to the terminal device according to the third configuration information; The network device receives a measurement result of the first reference signal from the terminal device.

4. The method according to claim 1 or 2, characterized in that: The network device acquiring a measurement result of the first reference signal includes: The network device sends fourth configuration information to the terminal device; The network device receives the first reference signal from the terminal device, where the first reference signal is sent by the terminal device according to the fourth configuration information; The network device determines a measurement result of the first reference signal according to the received first reference signal.

5. The method according to claim 3 or 4, characterized in that: The third configuration information is used to configure at least one third resource unit set carrying the first reference signal, each third resource unit set includes N third resource units, and the fourth configuration information is used to configure at least one fourth resource unit set carrying the first reference signal, each fourth resource unit includes N fourth resource units, and there is a preset second offset between the N third resource units and the N fourth resource units.

6. The method according to claim 5, characterized in that The network device sending the first reference signal to the terminal device includes: The network device sends the first reference signal to the terminal device through an antenna port, and the first reference signal is carried on multiple resource units in the same time domain resources among the N third resource units, and / or the first reference signal is carried on multiple resource units in the same frequency domain resources among the N third resource units.

7. The method according to any one of claims 1 to 6, characterized in that The method further comprises: The network device sends the downlink reference signal to the terminal device according to the first configuration information; The network device receives a measurement result of the downlink reference signal from the terminal device; The network device estimates the downlink channel according to the measurement result of the first channel parameter and the downlink reference signal.

8. The method according to any one of claims 1 to 7, characterized in that The method further comprises: The network device sends the second configuration information to the terminal device; The network device receives the uplink reference signal from the terminal device, where the uplink reference signal is sent by the terminal device according to the second configuration information; The network device estimates the uplink channel according to the measurement result of the first channel parameter and the uplink reference signal.

9. The method according to any one of claims 1 to 8, characterized in that A sending period of the first reference signal is greater than a sending period of the downlink reference signal, and / or a sending period of the first reference signal is greater than a sending period of the uplink reference signal.

10. The method according to any one of claims 1 to 9, characterized in that The first channel parameter includes at least one of the following: Angular power spectrum, delay power spectrum, Doppler power spectrum, spatial correlation, frequency correlation, time correlation, index of at least one beam or spatial basis vector corresponding to the terminal device, index of at least one delay path or frequency basis vector corresponding to the terminal device.

11. The method according to claim 10, characterized in that If the frequency domain correlation is greater than the first threshold, the distance in the frequency domain between any two adjacent resource units in the M first resource units or the M second resource units in the same time domain is greater than a third offset, and / or, If the time domain correlation is greater than a fourth threshold, the M first resource units or the M second resource units are in the same frequency domain The distance between any two adjacent resource units in the time domain is greater than the fourth offset.

12. A channel measurement method, characterized in that: The method comprises: The terminal device sends the measurement result of a first reference signal to the network device or the terminal device sends the first reference signal to the network device, the terminal device sends the first reference signal for the network device to obtain the measurement result of the first reference signal, the measurement result of the first reference signal is used by the network device to determine first configuration information and second configuration information, the first reference signal is used to measure first channel parameters of an uplink channel and a downlink channel, the uplink channel and the downlink channel are channels for communication between the terminal device and the network device, the first configuration information is used to configure a downlink reference signal for measuring the downlink channel, and the second configuration information is used to configure an uplink reference signal for measuring the uplink channel.

13. The method according to claim 12, characterized in that The first configuration information is used to configure at least one first resource unit set carrying the downlink reference signal, each first resource unit set includes M first resource units, and the second configuration information is used to configure at least one second resource unit set carrying the uplink reference signal, each second resource unit set includes M second resource units, and there is a preset first offset between the M first resource units and the M second resource units.

14. The method according to claim 12 or 13, characterized in that The terminal device sends a measurement result of the first reference signal to the network device, including: The terminal device receives the first reference signal from the network device, where the first reference signal is sent by the network device according to third configuration information; Determining, by the terminal device, a measurement result of the first reference signal according to the received first reference signal; The terminal device sends the measurement result of the first reference signal to the network device.

15. The method according to claim 12 or 13, characterized in that The terminal device sending the first reference signal to the network device includes: The terminal device receives fourth configuration information from the network device; The terminal device sends the first reference signal to the network device according to the fourth configuration information, so that the network device obtains a measurement result of the first reference signal.

16. The method according to claim 14 or 15, characterized in that The third configuration information is used to configure at least one third resource unit set carrying the first reference signal, each third resource unit set including N third resource units, and the fourth configuration information is used to configure at least one fourth resource unit set carrying the first reference signal, each fourth resource unit set including N fourth resource units, and a preset second offset is provided between the N third resource units and the N fourth resource units.

17. The method according to claim 16, characterized in that The terminal device sending the first reference signal to the network device includes: The terminal device sends the first reference signal to the terminal device through an antenna port, and the first reference signal is carried on multiple resource units in the N fourth resource units that are in the same time domain resources, and / or the first reference signal is carried on multiple resource units in the N fourth resource units that are in the same frequency domain resources.

18. The method according to any one of claims 12 to 17, characterized in that The method further comprises: The terminal device receives a downlink reference signal from the network device, where the downlink reference signal is sent by the network device according to the first configuration information; The terminal device determines a measurement result of the downlink reference signal according to the received downlink reference signal; The terminal device sends a measurement result of the downlink reference signal to the network device, and the first channel parameter and the measurement result of the downlink reference signal are used by the network device to estimate the downlink channel.

19. The method according to any one of claims 12 to 18, characterized in that The method further comprises: The terminal device receives the second configuration information from the network device; The terminal device sends an uplink reference signal to the network device according to the second configuration information, so that the network device obtains a measurement result of the uplink reference signal. The first channel parameter and the measurement result of the uplink reference signal are used by the network device to estimate the uplink channel.

20. The method according to any one of claims 12 to 19, characterized in that A sending period of the first reference signal is greater than a sending period of the downlink reference signal, and / or a sending period of the first reference signal is greater than a sending period of the uplink reference signal.

21. The method according to any one of claims 12 to 20, characterized in that The first channel parameter includes at least one of the following: Angular power spectrum, delay power spectrum, Doppler power spectrum, spatial domain correlation, frequency domain correlation, time domain correlation, the index of at least one beam or spatial domain basis vector corresponding to the terminal device, and the index of at least one delay path or frequency domain basis vector corresponding to the terminal device.

22. The method according to claim 21, characterized in that If the frequency domain correlation is greater than the first threshold, the distance in the frequency domain between any two adjacent resource units in the M first resource units or the M second resource units in the same time domain is greater than a third offset, and / or, If the time domain correlation is greater than a second threshold, a distance in the frequency domain between any two adjacent resource units in the M first resource units or the M second resource units that are in the same time domain is greater than a fourth offset.

23. A communication device, characterized in that: include: A processor, wherein the processor is coupled to a memory, wherein the memory is used to store a program or an instruction, and when the program or the instruction is executed by the processor, the device executes the channel measurement method according to any one of claims 1 to 22.

24. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores a computer program, and when the computer program is executed on a computer, the computer is enabled to perform the channel measurement method according to any one of claims 1 to 22.

25. A computer program product, characterized in that The method comprises a computer program code, and when the computer program code is executed, the channel measurement method according to any one of claims 1 to 22 is implemented.

26. A communication system, characterized in that: The communication system includes a network device and a terminal device, the network device is used to execute the channel measurement method described in any one of claims 1 to 11, and the terminal device is used to execute the channel measurement method described in any one of claims 12 to 22.

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