Channel measurement method and device

Abstract

Provided are a channel measurement method and apparatus, the channel measurement method comprising: a network device can determine first configuration information for a downlink reference signal according to a measurement result of a first reference signal, and the network device can determine second configuration information for an uplink reference signal according to the measurement result of the first reference signal, wherein the first reference signal is used for measuring channel parameters of an uplink channel and a downlink channel. According to the method, the configuration of the two-stage reference signals is adopted during channel measurement, and the second-stage reference signals (for example, the uplink reference signals and the downlink reference signals) can be flexibly configured according to the measurement result of the first-stage reference signals (for example, the first reference signals) on the channel, so that the resource overhead of the reference signals for channel measurement is reduced.

Description

Technical Field

[0001] The present application relates to the field of communication technology, and more specifically, to a method and device for channel measurement. Background Art

[0002] Currently, for frequency division duplex (FDD) systems, the uplink spectrum is asymmetric with the downlink spectrum, so the uplink channel and the downlink channel do not have channel reciprocity. The network device measures the downlink channel by sending CSI-RS to the terminal device. 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 development of massive multiple input multiple output (massive MIMO) technology in the future, the antenna scale of network devices will be further increased, and the resource overhead of CSI-RS will also increase exponentially. For time division duplex (TDD) systems, the uplink channel spectrum is symmetric with the downlink channel spectrum, so the uplink channel and the downlink channel have channel reciprocity. The network device can measure the downlink channel by receiving SRS from the terminal device. 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 device. With the increase in the number of terminal devices 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 to be solved. Summary of the invention

[0003] The present application provides a channel measurement method and device, which can reduce the resource overhead of reference signals.

[0004] 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 the present application does not limit this.

[0005] The method includes: the network device obtains a measurement result of a first reference signal, the first reference signal is used to measure a first channel parameter 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 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 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.

[0006] Exemplarily, the network device may obtain the measurement result of the first reference signal in the following two ways:

[0007] 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; the network device receives a measurement result of the first reference signal from the terminal device.

[0008] Specifically, the third configuration information includes at least one of the following information about the network device sending the first reference signal:

[0009] 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.

[0010] 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 according to the received first reference signal.

[0011] Specifically, the fourth configuration information includes at least one of the following information about the terminal device sending the first reference signal:

[0012] 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.

[0013] Through the above method, a two-level reference signal configuration is adopted during channel measurement. Based on the measurement results of the first-level reference signal, the channel statistical characteristic parameters (i.e., the first channel parameters mentioned above) in the spatial, time or frequency domain of the channel can be obtained, so that the second-level measurement reference signal that best matches the channel characteristics can be configured, thereby minimizing the reference signal overhead while ensuring the channel measurement accuracy.

[0014] In combination with the first aspect, in certain implementations of the first aspect, 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.

[0015] Specifically, "there is a preset first offset between the M first resource units and the M second resource units" may be "there is a preset first offset between the M first resource units and the M second resource units in the time domain" and / or "there is a preset first offset between the M first resource units and the M second resource units in the frequency domain".

[0016] 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 first resource unit set where the M first resource units are located has the same size of time domain resources and frequency domain resources as the second resource unit set where the M second resource units are located, or the first resource unit set where the M first resource units are located has the same number of time domain units and / or frequency domain units as the second resource unit set where the M second resource units are located. The index of the M first resource units in the first resource unit set is the same as the index of the M second resource units in the second resource unit set. The index of the M first resource units in the first resource unit set may be an offset compared to the time domain starting position of the first resource unit set, or an offset 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 particle mapped by the downlink reference signal in each first resource unit set is the same. The same mapped time-frequency resource position may be the same offset of the mapped time domain unit index compared to the time domain starting position of the first resource unit set, and / or the same offset of the mapped frequency domain unit index compared to the frequency domain starting position of the first resource unit set. The M first resource units carrying the downlink reference signal and the M second resource units carrying the uplink reference signal may be located at different time domain resource positions, such as different OFDM symbols, time slots, subframes or system frames. The M first resource units carrying the downlink reference signal and the M second resource units carrying the uplink reference signal may correspond to different frequency domain resource positions, such as different frequency domain subbands, bandwidth parts (BWPs) or carriers.The preset first offset may 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.

[0017] 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.

[0018] Through 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 the downlink.

[0019] 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 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 there is a preset second offset between the N third resource units and the N fourth resource units.

[0020] Specifically, "there is a preset second offset between the N third resource units and the N fourth resource units" may be "there is a preset second offset between the N third resource units and the N fourth resource units in the time domain" and / or "there is a preset second offset between the N third resource units and the N fourth resource units in the frequency domain".

[0021] 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 third resource unit set where the N third resource units are located has the same size of time domain resources and frequency domain resources as the fourth resource unit set where the N fourth resource units are located, or the third resource unit set where the N third resource units are located has the same number of time domain units and / or frequency domain units as the fourth resource unit set where the N fourth resource units are located. 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 may 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 the same offset of the mapped time domain unit index compared to the time domain starting position of the third resource unit set, and / or the same offset of the mapped frequency domain unit index compared to the frequency domain starting position of the third resource unit set. 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, at 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 positions, for example, in different frequency domain subbands, BWPs or carriers. The preset second offset may represent the 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 positions, or the 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 positions.

[0022] 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.

[0023] 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 uplink and downlink.

[0024] 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 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 N third resource units that are in the same frequency domain resources.

[0025] Specifically, the first reference signal is mainly used to measure the spatial, time, and frequency domain related characteristics of the uplink channel and the downlink channel. In addition to requiring multiple antenna ports to send the first reference signal when measuring the spatial domain related characteristics, only one antenna port is required to send the first reference signal when measuring the time domain related characteristics and the time domain related characteristics, thereby reducing the resource overhead of sending the first reference signal.

[0026] In combination with the first aspect, in certain implementations of the first aspect, the method further includes: the network device sends a downlink reference signal to the terminal device according to the 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 according to the first channel parameter and the measurement result of the downlink reference signal.

[0027] Specifically, the first configuration information includes at least one of the following information about the network device sending a downlink reference signal:

[0028] The type of downlink reference signal sent, 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.

[0029] Through the above method, the estimation or measurement of the downlink 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.

[0030] In combination with the first aspect, in certain implementations of the first aspect, the method further 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.

[0031] Specifically, the second configuration information includes at least one of the following information about the terminal device sending an uplink reference signal:

[0032] 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.

[0033] 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.

[0034] In combination with the first aspect, in some implementations of the first aspect, 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.

[0035] 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.

[0036] Alternatively, the frequency domain density of sending the first reference signal is less than the frequency domain density of sending the downlink reference signal, and / or the frequency domain density of sending the first reference signal is less than the frequency domain density of sending the uplink reference signal. Alternatively, the time domain density of sending the first reference signal is less than the time domain density of sending the downlink reference signal, and / or the time domain density of sending the first reference signal is less than the time domain density of sending the uplink reference signal. The frequency domain density of the reference signal represents the number of frequency domain resource positions mapped by the reference signal or the number of frequency domain units mapped by the reference signal 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 in a manner of equal frequency domain unit intervals, and a large or small frequency domain density indicates a small or large interval of the frequency domain units. The time domain density of the reference signal represents the number of time domain resource positions mapped by the reference signal or the number of time domain units mapped by the reference signal within a time domain unit set. The one time domain unit set may be a time length window composed 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 transmission manner (in a manner of equal time domain unit interval), and a large or small time domain density indicates that the interval of the time domain unit is small or large, or the transmission period is small or large.

[0037] Specifically, the first channel parameter includes at least one of the following information:

[0038] 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, etc.

[0039] If the frequency domain correlation between the uplink channel and the downlink channel is greater than a 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 between the uplink channel and the downlink channel is greater than a fourth threshold, the distance in the time domain between any two adjacent resource units in the M first resource units and the M second resource units in the same frequency domain is greater than a fourth offset.

[0040] Through the above method, the time domain resource density and the 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.

[0041] In addition, if the frequency domain correlation between the uplink channel and the downlink channel is less than a 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 less than a third offset, and / or, if the time domain correlation between the uplink channel and the downlink channel is less than a fourth threshold, the distance in the time domain between any two adjacent resource units in the M first resource units and the M second resource units in the same frequency domain is less than a fourth offset.

[0042] 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 correspond to each other, 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 correspond to each other, 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.

[0043] In a second aspect, a channel measurement method is provided. The method may be executed by a terminal device, or may be executed by a chip or circuit configured in the terminal device, and the present application does not limit this.

[0044] 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 a 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.

[0045] Exemplarily, the measurement result of the first reference signal sent by the above-mentioned terminal device to the network device includes: 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 third configuration information; the terminal device determines the measurement result of the first reference signal based on the received first reference signal; and the terminal device sends the measurement result of the first reference signal to the network device.

[0046] Specifically, the third configuration information includes at least one of the following information about the network device sending the first reference signal:

[0047] 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.

[0048] 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.

[0049] Specifically, the fourth configuration information includes at least one of the following information about the terminal device sending the first reference signal:

[0050] 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.

[0051] Through the above method, a two-level reference signal configuration is adopted during channel measurement. Based on the measurement results of the first-level reference signal, the channel statistical characteristic parameters (i.e., the first channel parameters mentioned above) in the spatial, time or frequency domain of the channel can be obtained, so that the second-level measurement reference signal that best matches the channel characteristics can be configured, thereby minimizing the reference signal overhead while ensuring the channel measurement accuracy.

[0052] In combination with the second aspect, in certain implementations of the second aspect, 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.

[0053] Specifically, "there is a preset first offset between the M first resource units and the M second resource units" may be "there is a preset first offset between the M first resource units and the M second resource units in the time domain" and / or "there is a preset first offset between the M first resource units and the M second resource units in the frequency domain".

[0054] 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 first resource unit set where the M first resource units are located has the same size of time domain resources and frequency domain resources as the second resource unit set where the M second resource units are located, or the first resource unit set where the M first resource units are located has the same number of time domain units and / or frequency domain units as the second resource unit set where the M second resource units are located. The index of the M first resource units in the first resource unit set is the same as the index of the M second resource units in the second resource unit set. The index of the M first resource units in the first resource unit set may be an offset compared to the time domain starting position of the first resource unit set, or an offset 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 particle mapped by the downlink reference signal in each first resource unit set is the same. The same mapped time-frequency resource position may be the same offset of the mapped time domain unit index compared to the time domain starting position of the first resource unit set, and / or the same offset of the mapped frequency domain unit index compared to the frequency domain starting position of the first resource unit set. The M first resource units carrying the downlink reference signal and the M second resource units carrying the uplink reference signal may be located at different time domain resource positions, such as different OFDM symbols, time slots, subframes or system frames. The M first resource units carrying the downlink reference signal and the M second resource units carrying the uplink reference signal may correspond to different frequency domain resource positions, such as different frequency domain subbands, BWPs or carriers.The preset first offset may 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.

[0055] 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.

[0056] Through 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 the downlink.

[0057] In combination with the second aspect, in certain implementations of the second aspect, 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 there is a preset second offset between the N third resource units and the N fourth resource units.

[0058] Specifically, "there is a preset second offset between the N third resource units and the N fourth resource units" may be "there is a preset second offset between the N third resource units and the N fourth resource units in the time domain" and / or "there is a preset second offset between the N third resource units and the N fourth resource units in the frequency domain".

[0059] 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 third resource unit set where the N third resource units are located has the same size of time domain resources and frequency domain resources as the fourth resource unit set where the N fourth resource units are located, or the third resource unit set where the N third resource units are located has the same number of time domain units and / or frequency domain units as the fourth resource unit set where the N fourth resource units are located. 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 may 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 the same offset of the mapped time domain unit index compared to the time domain starting position of the third resource unit set, and / or the same offset of the mapped frequency domain unit index compared to the frequency domain starting position of the third resource unit set. 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, at 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 positions, for example, in different frequency domain subbands, BWPs or carriers. The preset second offset may represent the 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 positions, or the 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 positions.

[0060] 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.

[0061] 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 uplink and downlink.

[0062] In combination with the second aspect, in certain implementations of the second aspect, the 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.

[0063] Specifically, the first reference signal is mainly used to measure the spatial, time, and frequency domain related characteristics of the uplink channel and the downlink channel. In addition to requiring multiple antenna ports to send the first reference signal when measuring the spatial domain related characteristics, only one antenna port is required to send the first reference signal when measuring the time domain related characteristics and the time domain related characteristics, thereby reducing the resource overhead of sending the first reference signal.

[0064] In combination with the second aspect, in certain implementations of the second aspect, the method further includes: the terminal device receives a downlink reference signal from a network device, and 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 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 first channel parameter are used by the network device to estimate the downlink channel.

[0065] Specifically, the first configuration information includes at least one of the following information about the network device sending a downlink reference signal:

[0066] The type of downlink reference signal sent, 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.

[0067] Through the above method, the estimation or measurement of the downlink 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.

[0068] In combination with the second aspect, in certain implementations of the second aspect, the method further 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 result of the uplink reference signal, and the measurement result of the uplink signal parameter and the above-mentioned first channel parameter are used by the network device to estimate the uplink channel.

[0069] Specifically, the second configuration information includes at least one of the following information about the terminal device sending an uplink reference signal:

[0070] 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.

[0071] 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.

[0072] In combination with the second aspect, in some implementations of the second aspect, 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.

[0073] 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.

[0074] Alternatively, the frequency domain density of sending the first reference signal is less than the frequency domain density of sending the downlink reference signal, and / or the frequency domain density of sending the first reference signal is less than the frequency domain density of sending the uplink reference signal. Alternatively, the time domain density of sending the first reference signal is less than the time domain density of sending the downlink reference signal, and / or the time domain density of sending the first reference signal is less than the time domain density of sending the uplink reference signal. The frequency domain density of the reference signal represents the number of frequency domain resource positions mapped by the reference signal or the number of frequency domain units mapped by the reference signal 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 in a manner of equal frequency domain unit intervals, and a large or small frequency domain density indicates a small or large interval of the frequency domain units. The time domain density of the reference signal represents the number of time domain resource positions mapped by the reference signal or the number of time domain units mapped by the reference signal within a time domain unit set. The one time domain unit set may be a time length window composed 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 transmission manner (in a manner of equal time domain unit interval), and a large or small time domain density indicates that the interval of the time domain unit is small or large, or the transmission period is small or large.

[0075] Specifically, the first channel parameter includes at least one of the following information:

[0076] 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, etc.

[0077] If the frequency domain correlation between the uplink channel and the downlink channel is greater than a 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 between the uplink channel and the downlink channel is greater than a fourth threshold, the distance in the time domain between any two adjacent resource units in the M first resource units and the M second resource units in the same frequency domain is greater than a fourth offset.

[0078] Through the above method, the time domain resource density and the 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.

[0079] In addition, if the frequency domain correlation between the uplink channel and the downlink channel is less than a 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 less than a third offset, and / or, if the time domain correlation between the uplink channel and the downlink channel is less than a fourth threshold, the distance in the time domain between any two adjacent resource units in the M first resource units and the M second resource units in the same frequency domain is less than a fourth offset.

[0080] 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 correspond to each other, 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 correspond to each other, 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.

[0081] In a third aspect, a channel measurement device is provided, the device comprising: a transceiver unit and a processing unit, the transceiver unit is used to obtain a measurement result of a first reference signal, the first reference signal is used to measure a first channel parameter of an uplink channel and a downlink channel, the uplink channel and the downlink channel are channels for communication between a terminal device and a network device. The processing unit is used to determine 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 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.

[0082] The transceiver unit is used to obtain the measurement result of the first reference signal, including the following two methods:

[0083] Method 1: The processing unit is used to determine the third configuration information; the transceiver unit is also used to send the first reference signal to the terminal device according to the third configuration information; the transceiver unit is also used to receive the measurement result of the first reference signal from the terminal device.

[0084] Method 2: The above-mentioned transceiver unit is used to send 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.

[0085] In combination with the third aspect, in certain implementations of the third aspect, 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.

[0086] In combination with the third aspect, in certain implementations of the third aspect, 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 there is a preset second offset between the N third resource units and the N fourth resource units.

[0087] 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 a 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.

[0088] 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 result of the downlink reference signal from the terminal device; the above-mentioned processing unit is also used to estimate the downlink channel according to the above-mentioned first channel parameter and the measurement result of the downlink reference signal.

[0089] 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.

[0090] In combination with the third aspect, in certain implementations of the third aspect, 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.

[0091] Specifically, the first channel parameter includes at least one of the following information:

[0092] 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, etc.

[0093] If the frequency domain correlation between the uplink channel and the downlink channel is greater than a 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 between the uplink channel and the downlink channel is greater than a fourth threshold, the distance in the time domain between any two adjacent resource units in the M first resource units and the M second resource units in the same frequency domain is greater than a fourth offset.

[0094] In addition, if the frequency domain correlation between the uplink channel and the downlink channel is less than a 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 less than a third offset, and / or, if the time domain correlation between the uplink channel and the downlink channel is less than a fourth threshold, the distance in the time domain between any two adjacent resource units in the M first resource units and the M second resource units in the same frequency domain is less than a fourth offset.

[0095] The explanation of the contents related to the channel measurement device provided in the third aspect and its beneficial effects can all be referred to the channel measurement method shown in the first aspect, and will not be repeated here.

[0096] In a fourth aspect, a channel measurement device is provided, comprising: a transceiver unit, the transceiver unit being used to send a measurement result of a first reference signal to a network device or a terminal device sending a first reference signal to a network device, the terminal device sending the first reference signal to the network device is used 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 a first channel parameter 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.

[0097] 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.

[0098] 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.

[0099] In combination with the fourth aspect, in certain implementations of the fourth aspect, 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.

[0100] In combination with the fourth aspect, in certain implementations of the fourth aspect, 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 there is a preset second offset between the N third resource units and the N fourth resource units.

[0101] 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 a 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.

[0102] 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.

[0103] 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 according to the second configuration information, so that the network device obtains the measurement result of the uplink reference signal, and the measurement result of the uplink signal parameter and the above-mentioned first channel parameter are used by the network device to estimate the uplink channel.

[0104] In combination with the fourth aspect, in certain implementations of the fourth aspect, 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.

[0105] Specifically, the first channel parameter includes at least one of the following information:

[0106] 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, etc.

[0107] If the frequency domain correlation between the uplink channel and the downlink channel is greater than a 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 between the uplink channel and the downlink channel is greater than a fourth threshold, the distance in the time domain between any two adjacent resource units in the M first resource units and the M second resource units in the same frequency domain is greater than a fourth offset.

[0108] In addition, if the frequency domain correlation between the uplink channel and the downlink channel is less than a 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 less than a third offset, and / or, if the time domain correlation between the uplink channel and the downlink channel is less than a fourth threshold, the distance in the time domain between any two adjacent resource units in the M first resource units and the M second resource units in the same frequency domain is less than a fourth offset.

[0109] The explanation of the contents related to the channel measurement device provided in the fourth aspect and its beneficial effects can all be referred to the channel measurement method shown in the second aspect, and will not be repeated here.

[0110] In a fifth aspect, a communication device is provided, comprising a processor, wherein the processor is used to enable the communication device to execute the method described in 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 method described in the second aspect and any possible method described in the second aspect.

[0111] In a possible implementation, the communication device further includes a memory for storing the computer program or instruction.

[0112] In a possible implementation manner, the communication device further includes a communication interface, which is used to input and / or output signals.

[0113] In a 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.

[0114] 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 possibility of the first aspect is executed; or, the method described in the second aspect and any possibility of the second aspect is executed.

[0115] 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.

[0116] 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

[0117] Figure 1 It is a schematic diagram of an example of a communication system 100 applicable to an embodiment of the present application.

[0118] Figure 2 It is a schematic flow chart of a channel measurement method 200 applicable to an embodiment of the present application.

[0119] Figure 3(a) is a schematic diagram of third configuration information and fourth configuration information applicable to a TDD communication system.

[0120] Figure 3 (b) is a schematic diagram of resource configuration of a reference signal according to an embodiment of the present application.

[0121] Figure 3 (c) is a schematic diagram of third configuration information and fourth configuration information applicable to an FDD communication system.

[0122] Figure 4 It is a schematic diagram of resource configuration of a reference signal applicable to an embodiment of the present application.

[0123] Figure 5 (a) is a schematic diagram of first configuration information and second configuration information applicable to a TDD communication system.

[0124] Figure 5 (b) is a schematic diagram of first configuration information and second configuration information applicable to an FDD communication system.

[0125] Figure 6 It is a schematic diagram of resource configuration of a reference signal applicable to an embodiment of the present application.

[0126] Figure 7 It is a schematic block diagram of an example of a communication device 700 applicable to an embodiment of the present application.

[0127] Figure 8 It is a schematic block diagram of an example of a communication device 800 applicable to an embodiment of the present application.

[0128] Fig. 9 It is a schematic block diagram of an example of a communication device 900 applicable to an embodiment of the present application. DETAILED DESCRIPTION

[0129] In order to facilitate understanding of the embodiments of the present application, the following points are first explained.

[0130] 1. In this application, unless otherwise specified, "plurality" means two or more.

[0131] 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 to each other. The technical features in different embodiments can be combined to form new embodiments according to their internal logical relationships.

[0132] 3. The various digital 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 execution order 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.

[0133] At the same time, any embodiment or design described in the present 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 related concepts in a concrete manner for ease of understanding.

[0134] 4. The terms "comprise", "include", "have" and any variations thereof are intended to cover non-exclusive inclusions. For example, a process, method, system, product or apparatus comprising 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.

[0135] 5. In this application, "preset" may include pre-definition, for example, protocol definition. Among them, "pre-definition" can be implemented by pre-saving corresponding codes, tables or other methods that can be used to indicate relevant information in the device, and this application does not limit its specific implementation method.

[0136] 6. The term "storage" or "saving" as used in this application may refer to saving in one or more memories. The one or more memories may be provided separately or integrated in an encoder or decoder, a processor, or a communication device. The one or more memories may also be partially provided separately and partially integrated in a decoder, a processor, or a communication device. The type of memory may be any form of storage medium, which is not limited thereto.

[0137] 7. The arrows or boxes indicated by dotted lines in the schematic diagrams of the drawings in the specification of this application represent optional steps or optional modules.

[0138] 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, where A and B can be singular or plural.

[0139] 9. The “frequency domain unit” involved in this application may be a subcarrier, a carrier, an RB, a frequency domain subband, a BWP, etc. The “time domain unit” involved in this application may be an OFDM symbol, a time slot, a subframe, a 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.

[0140] First, a communication system to which the embodiments of the present application are applicable is described.

[0141] Figure 1 1 is a schematic diagram of a communication system 100 applicable to an embodiment of the present application. Figure 1 As shown, the communication system 100 includes: a network device 110 and a terminal device 120 .

[0142] The terminal device 120 is a device with wireless transceiver functions, which may refer to 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) machine, a handheld device with wireless communication function, a computing device or other processing device connected to a wireless modem, a vehicle-mounted device, a communication device carried on a high-altitude aircraft, a wearable device, a drone, a robot, a terminal in device-to-device communication (D2D), 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 wireless terminal in medical equipment. 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.

[0143] The communication device for implementing the function of the terminal device 120 may be a terminal device, or a device capable of supporting the terminal device to implement the function, such as a chip system. The device may be installed in the terminal device or used in conjunction with the terminal device. In the present application, the chip system may be composed of a chip, or may include a chip and other discrete devices.

[0144] 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 a 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 service gateway (BNG), an aggregation switch or a third generation partnership project (3GPP) access device, etc.

[0145] The above-mentioned 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), etc. The network device 110 can also include various forms of base stations, such as: macro base stations, micro base stations (also called small stations), relay stations, transmission points (transmitting and receiving points, TRP), transmission points (transmitting points, TP), mobile switching centers, and devices that assume the function of base stations in device-to-device (D2D), vehicle-to-everything (V2X), machine-to-machine (M2M) communications, network devices in non-terrestrial networks (NTN), etc., without specific limitation.

[0146] 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 radio frequency remote processing 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 the RU in the O-RAN system, etc., without limitation.

[0147] The communication device for implementing the function of the network device 110 may be a network device, or a device capable of supporting the network device to implement the function, such as a chip system. The device may be installed in the network device or used in conjunction with the network device. The chip system in the embodiment of the present application may be composed of a chip, or may include a chip and other discrete devices.

[0148] In an 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, intersatellite 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 may refer to a non-ground base station or non-ground equipment such as a drone, a hot air balloon, a low-orbit satellite, a medium-orbit satellite, and a high-orbit satellite.

[0149] The communication system 100 may also be a ground 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.

[0150] The following is a brief introduction to the relevant concepts involved in the technical solution of this application:

[0151] 1. Sounding Reference Signal (SRS)

[0152] 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 the 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.

[0153] 2. Channel State Information Reference Signal (CSI-RS)

[0154] 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.

[0155] For FDD systems, the uplink spectrum is asymmetric with the downlink spectrum, so the uplink channel and the downlink channel do not have channel reciprocity. The network device measures the downlink channel by sending CSI-RS to the terminal device. 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 development of massive multiple input multiple output (massive MIMO) technology in the future, the antenna scale of network devices will be further increased, and the resource overhead of CSI-RS will also increase exponentially. For TDD systems, the uplink channel spectrum is symmetric with the downlink channel spectrum, so the uplink channel and the downlink channel have channel reciprocity. The network device can measure the downlink channel by receiving SRS from the terminal device. 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 device. With the increase in the number of terminal devices in the future, the resource overhead of SRS will also increase exponentially. Therefore, how to effectively control the resource overhead of the reference signal during channel measurement is an urgent problem to be solved.

[0156] The channel measurement method according to the embodiment of the present application will be described below in conjunction with the accompanying drawings.

[0157] Figure 2 It is a schematic diagram of the interactive process of the channel measurement method 200 according to an embodiment of the present application. Figure 2The method shown may be executed by the terminal device 120 and the network device 110, or by a module and / or device (e.g., a chip or an integrated circuit, etc.) with corresponding functions installed in the terminal device 120 and the network device 110, without limitation. The following description is made by taking the terminal device 120 and the network device 110 as an example. Figure 2 As shown, the method 200 includes:

[0158] Step S220: The network device obtains a measurement result of the first reference signal.

[0159] 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 a terminal device and a network device.

[0160] The measurement result of the first reference signal corresponds to the first channel parameter.

[0161] Specifically, the first channel parameter includes at least one of the following information:

[0162] Spatial domain correlation, frequency domain correlation, time domain correlation, at least one beam or spatial domain basis vector index corresponding to the terminal device, at least one delay path or frequency domain basis vector index corresponding to the terminal device, etc. Among them, the spatial domain correlation includes the spatial domain correlation matrix, angle power spectrum, etc., the frequency domain correlation includes the frequency domain correlation matrix, delay power spectrum, etc., and the time domain correlation includes the time domain correlation matrix, Doppler power spectrum, etc.

[0163] It should be understood that the above first channel parameters are the same for the uplink channel and the downlink channel.

[0164] The network device may obtain the measurement result of the first reference signal in the following two ways.

[0165] The first method includes: step S210, the network device determines third configuration information.

[0166] 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.

[0167] Specifically, the third configuration information includes at least one of the following information about the network device sending the first reference signal:

[0168] 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.

[0169] 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.

[0170] 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.

[0171] Exemplarily, the first reference signal in the first manner described above may be a CSI-RS. It may also be other types of downlink reference signals. The first reference signal may be sent on corresponding one or more time domain units and / or one or more frequency domain units based on the configuration of the network device.

[0172] The second method includes: Step S210, the network device determines fourth configuration information.

[0173] Specifically, the fourth configuration information includes at least one of the following information about the terminal device sending the first reference signal:

[0174] 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.

[0175] Step S216: The network device sends fourth configuration information to the terminal device.

[0176] Step S218: The terminal device sends the 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. The network device obtains the measurement result of the first reference signal according to the received first reference signal.

[0177] 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.

[0178] Exemplarily, the first reference signal in the second manner may be an SRS. It may also be other types of uplink reference signals. The first reference signal may be sent on corresponding one or more time domain units and / or one or more frequency domain units based on the configuration of the network device.

[0179] Currently, various communication systems support flexible configuration of uplink resources and downlink resources. Since the configuration of uplink resources and downlink resources may be different, the uplink channel and the downlink channel may interfere with each other. This application proposes a method to effectively control the interference generated by the uplink channel and the downlink channel, as described below:

[0180] Specifically, the third configuration information is used to configure at least one third resource unit set carrying the first reference signal, each third resource unit 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, such as Figure 3 There is a preset second offset between the N third resource units and the N fourth resource units.

[0181] For example, Figure 3 (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 for carrying a network device to send a first reference signal to a terminal device is configured in a downlink (DL) time slot, Figure 3 (a) shows only one of the third resource unit sets; at least one fourth resource unit set for carrying the terminal device to send a first reference signal to the network device is configured in the uplink (UL) time slot, Figure 3 (a) shows only one fourth resource unit set, and 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 Figure 3As shown in (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. A third resource unit set corresponds to a resource block consisting of 28 frequency domain units in the frequency domain 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) mapping the first reference signal. Similarly, a fourth resource unit set corresponds to a resource block consisting of 28 frequency domain units in the frequency domain 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) mapping 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 position and frequency domain position of the N third resource units mapped in the third resource unit set are the same as the time domain position and frequency domain position of the N fourth resource units mapped in the fourth resource unit set. The preset second offset may be an 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 may be a value configured by the network device or a value predefined by the protocol.

[0182] 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.

[0183] 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.

[0184] 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 overlapping with the N fourth resource units after being shifted by the second offset in the frequency domain. 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.

[0185] 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. Alternatively, the index of the N third resource units in the at least one third resource unit set is the same as the index of the N fourth resource units in the at least one fourth resource unit set.

[0186] For example, Figure 3 (b), assuming that the third resource unit set corresponding to the above-mentioned N third resource units is an RB#1, and 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, 11) and 7 OFDM symbols in the time domain (respectively recorded as indexes A, B, C, D, E, F, G). The 8 resource units used to send the first reference signal for downlink in RB#1 occupy subcarriers 1, 3, 5, 7, 9, 11 in the frequency domain, and occupy OFDM symbols B, D, 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, 11 in the frequency domain, and occupy OFDM symbols B, D, F in the time domain. Assume that the frequency domain starting position of RB#1 and RB#2 is the subcarrier with index 0, and the time domain starting position is the OFDM symbol with index A in the time domain. Take resource unit #1 in RB#1 that occupies the subcarrier with index 5 in the frequency domain and the OFDM symbol with index B in the time domain, and resource unit #2 in RB#2 that occupies the subcarrier with index 5 in the frequency domain and the OFDM symbol with index B in the time domain as examples for explanation: the frequency domain offset of resource unit #1 relative to the frequency domain starting position is 5 subcarriers, and the time domain offset relative to the time domain starting position is 1 OFDM symbol; the frequency domain offset of resource unit #2 relative to the frequency domain starting position is 5 subcarriers, and the time domain offset relative to the time domain starting position is 1 OFDM symbol, that is, the resource position occupied by resource unit #1 in RB#1 and resource unit #2 in RB#2 is the same. The other corresponding resource units in RB#1 and RB#2 are similar and will not be repeated here.

[0187] 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.

[0188] For example, Figure 3(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 the FDD communication system. At least one third resource unit set for carrying a first reference signal sent by a network device to a terminal device is configured in the DL spectrum, Figure 3 (c) shows only two of the third resource unit sets; the UL spectrum is configured with at least one fourth resource unit set for carrying a first reference signal sent by the terminal device to the network device, Figure 3 (c) shows only one fourth resource unit set, and there is a preset second offset in the frequency 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 Figure 3 As shown in (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. A 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) mapping 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) mapping 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 position and frequency domain position of the N third resource units mapped in the third resource unit set are the same as the time domain position and frequency domain position 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.

[0189] 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.

[0190] 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 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.

[0191] 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 a network device or a value predefined by a protocol.

[0192] 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. Alternatively, the index of the N third resource units in the at least one third resource unit set is the same as the index of the N fourth resource units in the at least one fourth resource unit set.

[0193] The mapping rules of the uplink resources and the downlink resources in the above method are the same, and the interference generated by the uplink channel and the downlink channel can be better controlled by aligning the downlink resources with the downlink resources. In addition, the above method can use less signaling overhead to indicate to the terminal device how to send the first uplink reference signal and how to receive the first downlink reference signal.

[0194] 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 be further increased, 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, specifically, Figure 4 As shown:

[0195] Figure 4 The reference signal transmission of a resource unit set is taken as an example for explanation, but it should be understood that the resource unit set may be the third resource unit set or the fourth resource unit set, and the resource unit set may also be the first resource unit set or the second resource unit set, which is not limited in this application. Each resource unit set configured by the network device is Figure 4 The reference signal is sent in the manner shown. Assuming that the network device has 64 antenna ports and the terminal device has 4 antenna ports, the present application does not limit the number of antenna ports of the network device and the terminal device.

[0196] When measuring spatial correlation, the network device sends a first reference signal on any one of the N third resource units through 64 antenna ports. Alternatively, the terminal device sends a first reference signal on any one of the N fourth resource units through 4 antenna ports. For example, the any one resource unit may be Figure 4 The resource unit indicated by "Obtaining spatial correlation characteristics" in .

[0197] 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 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 time domain resources in the N fourth resource units. Exemplarily, the multiple resource units can be Figure 4 The resource unit indicated by "Obtaining frequency domain correlation characteristics" in

[0198] 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 Figure 4 The resource unit indicated by "Obtaining time domain correlation characteristics" in

[0199] 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.

[0200] Step S220: The network device obtains a measurement result of the first reference signal by using the first method or the second method.

[0201] Step S222: 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 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.

[0202] Specifically, the first configuration information includes at least one of the following information about the network device sending a downlink reference signal:

[0203] 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.

[0204] Specifically, the second configuration information includes at least one of the following information about the terminal device sending an uplink reference signal:

[0205] 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.

[0206] Specifically, the first configuration information is used to configure at least one first resource unit set carrying a 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 an uplink reference signal, each second resource unit set includes M second resource units. Figure 5 There is a preset first offset between the M first resource units and the M second resource units.

[0207] For example, Figure 5 (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 a DL time slot, Figure 5 (a) shows only three first resource unit sets; at least one second resource unit set for carrying a first reference signal sent by the terminal device to the network device is configured in the UL time slot, Figure 5 Only three second resource unit sets are shown in (a), and 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 Figure 5As shown in (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. A 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) mapping 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) mapping 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 also 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 preset first offset may be an 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 may be a value configured by the network device or a value predefined by the protocol.

[0208] 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 is the same as the mapping pattern of the M second resource units in the UL time slot.

[0209] 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 overlap with the M second resource units of the UL time slot after being shifted by the first offset in the time domain.

[0210] 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 overlapping with the M second resource units after being shifted by the first offset in the frequency domain. 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.

[0211] The index of the M first resource units in the first resource unit set is the same as the index of the M second resource units in the second resource unit set. Alternatively, the index of the M first resource units in the at least one first resource unit set is the same as the index of the M second resource units in the at least one second resource unit set.

[0212] For example, Figure 5 (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 the 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. Figure 5 (b) shows only two first resource unit sets; the UL spectrum is configured with at least one second resource unit set for carrying a first reference signal sent by the terminal device to the network device, Figure 5 (b) of FIG. 1 shows only one set of second resource units, and there is a preset first offset between the M first resource units and the M second resource units in the frequency domain. Specifically, as Figure 5 As shown in (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. A 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) mapping downlink reference signals. 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 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 also 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.

[0213] Alternatively, the presence of a 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 mapping pattern of the M first resource units of the DL spectrum is the same as the mapping pattern of the M second resource units of the UL spectrum.

[0214] 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 overlapping with the M second resource units of the UL spectrum after being shifted by the first offset in the frequency domain.

[0215] 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 an interval or offset value between a time domain unit (such as a time slot) where the M first resource units are located and a 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.

[0216] The index of the M first resource units in the first resource unit set is the same as the index of the M second resource units in the second resource unit set. Alternatively, the index of the M first resource units in the at least one first resource unit set is the same as the index of the M second resource units in the at least one second resource unit set.

[0217] The mapping rules of uplink resources and downlink resources in the above method are the same, and the interference generated by the uplink channel and the downlink channel can be better controlled by aligning the downlink resources with the uplink resources. In addition, the above method can use less signaling overhead to indicate to the terminal device how to send an uplink reference signal and how to receive a downlink reference signal.

[0218] In addition, since the first channel parameter of the channel measured by the first reference signal is slowly changing, and the small-scale characteristics of the channel measured by the uplink reference signal and the downlink reference signal are fast changing, the first configuration information of the present application may 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 may configure the transmission period of the uplink reference signal to be smaller than the transmission period of the first reference signal, such as Figure 5 (a) and Figure 5 This configuration can also reduce the resource overhead of the reference signal.

[0219] Alternatively, the third configuration information and the fourth configuration information of the present application may configure the first reference signal to be sent in a long period, the first configuration information of the present application may configure the above-mentioned downlink reference signal to be sent in a short period, and the second configuration information of the present application may configure the above-mentioned uplink reference signal to be sent in a short period, such as Figure 5 (a) and Figure 5 as shown in (b).

[0220] 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:

[0221] When the measurement result of the first reference signal is that the frequency domain correlation between the uplink channel and the downlink channel is greater than the first threshold, it means that the frequency domain correlation between the uplink channel and the downlink channel is strong, and the uplink channel and the downlink channel change slowly in the frequency domain. Therefore, the comb degree of the frequency domain position for sending the downlink reference signal configured by the first configuration information is large (for example, it can be 4); in other words, the distance between any two adjacent resource units in the same time domain resources in the M first resource units configured by the first configuration information in the frequency domain is greater than the third offset, such as Figure 6 On the contrary, when the measurement result of the first reference signal is that the frequency domain correlation between the uplink channel and the downlink channel is less than the first threshold, it means that the frequency domain correlation between the uplink channel and the downlink channel is weak, and the uplink channel and the downlink channel change rapidly in the frequency domain. Therefore, the comb degree of the frequency domain position for sending the downlink reference signal configured by the first configuration information is small (for example, it can be 2); in other words, the distance between any two adjacent resource units in the same time domain resources in the M first resource units configured by the first configuration information in the frequency domain is less than the third offset, as shown in FIG. Figure 6 shown.

[0222] Specifically, the current frequency domain comb teeth are usually set to 2, 4, or 8.

[0223] Alternatively, when the measurement result of the first reference signal is that the frequency domain correlation between the uplink channel and the downlink channel is greater than the 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 is 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 the 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 is 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 the 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 comb degree on a certain frequency domain can be corresponded according to the multiple thresholds.

[0224] Similarly, if Figure 6 As shown, 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 small (for example, it can be 2).

[0225] 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, it means that the time domain correlation between the uplink channel and the downlink channel is strong, and the uplink channel and the downlink channel change slowly in the time domain. Therefore, the sending period of the time domain position for sending the downlink reference signal configured by the first configuration information is large (for example, it can be 4 time slots); in other words, the distance in the time domain between any two adjacent resource units in the M first resource units configured by the first configuration information and in the same frequency domain resources is greater than the fourth offset, such as Figure 6 On the contrary, 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 second threshold, it means that the time domain correlation between the uplink channel and the downlink channel is weak, and the uplink channel and the downlink channel change rapidly in the time domain. Therefore, the transmission period of the time domain position of sending the downlink reference signal configured by the first configuration information is small (for example, it can be 3 time slots); in other words, the distance in the time domain 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 FIG. Figure 6 shown.

[0226] It can also be that 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 sending period of the time domain position of 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 sending period of the time domain position of 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 sending period of the time domain position of 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 correspond to a sending period in a certain time domain according to the multiple thresholds.

[0227] Similarly, if Figure 6 As shown, at this time, the sending period of the time domain position for sending the uplink reference signal configured by the second configuration information is also relatively small (for example, it can be 3 time slots).

[0228] 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 composed 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 transceiver antenna port pair or a transceiver antenna pair.

[0229] 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, and the channel frequency domain correlation coefficient corresponding to the frequency domain unit pair composed of the i-th frequency domain unit and the j-th frequency domain unit can be expressed as:

[0230] or

[0231] 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).

[0232] 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.

[0233] 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 the 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. of the channel.

[0234] 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 delay of the channel 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

[0235] The frequency domain correlation may also be other parameters corresponding to the uplink channel or the downlink channel that reflect the frequency selective fading of the channel, such as the coherence bandwidth of the channel, for example

[0236] 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, wherein the channel matrix may be a channel vector corresponding to a port or an antenna or a channel coefficient corresponding to a transceiver antenna port pair or a transceiver antenna pair.

[0237] 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, and the channel time domain correlation coefficient corresponding to the time domain unit pair composed of the i-th time domain unit and the j-th time domain unit can be expressed as:

[0238] or

[0239] 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).

[0240] The above 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.

[0241] The time domain correlation may also be other forms of Doppler power spectrum correlation corresponding to the uplink channel or the downlink channel, such as Doppler spread, Doppler frequency deviation, Doppler spectrum bandwidth, etc. The frequency domain correlation may also be other parameters reflecting time selective fading of the channel corresponding to the uplink channel or the downlink channel, such as coherence time of the channel, etc.

[0242] For example, assuming that the Doppler frequency deviation 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

[0243] The above method can make full use of 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.

[0244] Step S224: the network device sends a downlink reference signal to the terminal device according to the first configuration information. Accordingly, the terminal device receives the downlink reference signal from the network device.

[0245] 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.

[0246] Step S228: The network device estimates the downlink channel according to the measurement result of the first channel parameter and the downlink reference signal.

[0247] Step S230: The network device sends second configuration information to the terminal device.

[0248] 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. The network device obtains a measurement result of the uplink reference signal according to the received uplink reference signal.

[0249] Step S234: The network device estimates the uplink channel according to the measurement result of the first channel parameter and the uplink reference signal.

[0250] Finally, the device embodiment of the embodiment of the present application is introduced.

[0251] In order to implement the functions in the method provided in this application, the terminal device 120 and the network device 110 may include a hardware structure and / or a software module, and implement the above functions in the form of a hardware structure, a software module, or a hardware structure plus a software module. Whether a function of the above functions is executed in the form of a hardware structure, a software module, or a hardware structure plus a software module depends on the specific application and design constraints of the technical solution.

[0252] Figure 7 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, and the processor 710 and the communication interface 720 may be interconnected via a bus 730. The communication device 700 may be a network device 110 or a terminal device 120.

[0253] Optionally, the communication device 700 may further include a memory 740. The memory 740 includes, but is not limited to, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM), or a portable read-only memory (CD-ROM), and the memory 740 is used for related instructions and data.

[0254] The processor 710 may be one or more central processing units (CPUs). When the processor 710 is a CPU, the CPU may be a single-core CPU or a multi-core CPU.

[0255] When the communication apparatus 700 is a terminal device 120 , illustratively, the communication apparatus 700 is used to perform the following operations: sending a measurement result of the first reference signal to the network device 110 , etc.

[0256] When the communication device 700 is the network device 110, illustratively, the communication device 700 is used to perform the following operations: obtaining a measurement result of a first reference signal, etc.

[0257] The above contents are only for exemplary description. When the communication device 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 above method embodiments.

[0258] The above description is only an exemplary description. For specific content, please refer to the content shown in the above method embodiment. Figure 7 The implementation of each operation in can also refer to Figures 2 to 6 The corresponding description of the method embodiment shown.

[0259] Figure 8 8 is a schematic block diagram of a communication device 800 according to an embodiment of the present application. The communication device 800 may be a network device 110 or a terminal device 120, or may be a chip or module in the network device 110 or the terminal device 120, for implementing the method involved in the above embodiment. The communication device 800 includes a transceiver unit 810. The transceiver unit 810 and the processing unit 820 are exemplarily introduced below.

[0260] The transceiver unit 810 may include a transmitting unit and a receiving unit. The transmitting unit is used to perform a transmitting action of the communication device, and the receiving unit is used to perform a receiving action of the communication device. For ease of description, the embodiment of the present application combines the transmitting unit and the receiving unit into one transceiver unit. A unified description is given here, and no further description is given later.

[0261] When the communication device 800 is a terminal device 120, illustratively, the transceiver unit 810 is used to send the measurement result of the first reference signal to the network device 110, and the processing unit 820 is used to determine the measurement result of the first reference signal according to the received first reference signal, etc.

[0262] When the communication device 800 is a 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.

[0263] The above contents are only exemplary descriptions. When the communication device 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 above method embodiments.

[0264] Optionally, the communication device 800 further includes a storage unit 830, and the storage unit 830 is used to store a program or code for executing the aforementioned method.

[0265] Figure 7 and Figure 8 The device embodiment shown is used to implement Figures 2 to 6 The content described. Figure 7 and Figure 8 The specific execution steps and methods of the device shown can refer to the contents described in the aforementioned method embodiment.

[0266] Fig. 9 1 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.

[0267] The 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 that can implement the method of the present application. The input / output interface 920 is used for inputting or outputting signals or data.

[0268] For example, when the communication device 900 is the terminal device 120, the input / output interface 920 is used to send the measurement result of the first reference signal to the network device 110. The processor 910 is used to determine the measurement result of the first reference signal according to the received first reference signal.

[0269] For example, the communication device 900 is the network device 110, and the input / output interface 920 is used to receive a measurement result of a first reference signal from the terminal device 120. The processor 910 is used to determine the first configuration information and the second configuration information according to the measurement result of the first reference signal.

[0270] 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.

[0271] Optionally, the communication device 900 also includes a memory.

[0272] Optionally, the processor and memory are integrated together.

[0273] Optionally, the memory is outside the communication device 900 .

[0274] In a possible implementation, the processor 910 may be a logic circuit, and the processor 910 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.

[0275] 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. The specific content can be found in the description of the above method embodiment, which will not be repeated here.

[0276] 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.

[0277] The present application also provides a chip, including: 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 used to execute the code in the memory, and when the code is executed, the processor is used to execute the method in each of the above examples. Optionally, the chip also includes a memory, and the memory is used to store computer programs or codes.

[0278] The present application also provides a processor, which is coupled to a memory and is used to execute the methods and functions involving a network device or a terminal device in any of the above embodiments.

[0279] The present application provides a computer program product including instructions. When the computer program product is run on a computer, the method of the above embodiment is implemented.

[0280] The present application also provides a computer program. When the computer program is executed in a computer, the method of the above embodiment is implemented.

[0281] 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.

[0282] Those of ordinary skill 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 to be beyond the scope of this application.

[0283] Those skilled in the art can 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.

[0284] In several embodiments provided in the present 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. There may be other division methods in actual implementation. For example, 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.

[0285] The units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, they may be located in one place or distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the technical solution of the embodiment of the present application.

[0286] 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.

[0287] 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 can be essentially or partly embodied in the form of a software product that contributes to the prior art. The computer software product is stored in a storage medium and includes several instructions for a computer device (which can be a personal computer, server, or network device, etc.) to perform 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 USB flash drives, mobile hard drives, ROM, RAM, magnetic disks, or optical disks.

[0288] The above is only a specific implementation of the present application, but the protection scope of the embodiments of the present application is not limited thereto. Any changes or substitutions that can be easily thought of by any technician familiar with the technical field within the technical scope disclosed in the embodiments of the present application should be included in the protection scope of the embodiments of the present application. Therefore, the protection scope of the present application shall be based on the protection scope 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 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.

11. The method according to claim 10, characterized in that If the frequency domain correlation is greater than the first 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 in the same time domain is greater than a third offset, and / or, If the time domain correlation is greater than a fourth threshold, a distance in the time domain between any two adjacent resource units in the M first resource units or the M second resource units that are in the same frequency domain is greater than a 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, a 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, the processor is coupled to a memory, the memory is used to store programs or instructions, when the program or instructions are executed by the processor, the device executes the communication 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 caused to execute the communication 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 communication method according to any one of claims 1 to 22 is implemented.

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