Channel measurement method and apparatus

Abstract

The present application discloses a channel measurement method and apparatus. The method includes a step in which a network device transmits first information, the first information indicating K transmission time points for transmitting an NZP CSI-RS and m transmission gaps between adjacent transmission time points among the K transmission time points. After receiving the first information, the terminal device determines a time-domain position of a target CSI reference resource and can receive a measurement signal (time-domain position) before the target CSI reference resource. Cut The terminal device reports CSI to the network device at the time-domain position of the CSI report based on the measurement signal, and the network device receives the reported CSI. According to the method in the embodiment of the present application, channel measurement and determination of channel information can be effectively completed to ensure the communication performance of the terminal device.

Description

[Technical Field]

[0001] This application claims priority to Chinese Patent Application No. 202310145172.7, entitled "CHANNEL MEASUREMENT METHOD AND APPARATUS," filed with the State Intellectual Property Office of China on February 17, 2023, the entire contents of which are incorporated herein by reference.

[0002] The present application relates to the field of wireless communication technology, and in particular to a channel measurement method and apparatus. [Background technology]

[0003] Fifth-generation (5G) communication systems have higher requirements for system capacity, spectral efficiency, and so on. In 5G communication systems, massive multiple-input multiple-output (MIMO) technology plays an important role in the spectral efficiency of the system. When MIMO technology is used, the base station needs to perform modulation, coding, and signal precoding when transmitting data to user equipment (UE). The modulation, coding, precoding, and so on used by the base station to transmit data to the UE depend on the channel state information (CSI) reported by the UE to the base station. Therefore, the accuracy of the CSI reported by the UE significantly affects system performance.

[0004] In a new radio (NR) system, CSI measurement is performed by a base station transmitting a reference signal (specifically, a non-zero power channel state information reference signal (NZP CSI-RS)) and a UE detecting a downlink channel. The UE receives the NZP CSI-RS signal on a preconfigured channel measurement resource (CMR) for channel estimation. In addition, the base station further configures a group of interference measurement resources (IMR) corresponding to the CMR for the UE, and the UE receives a signal on the preconfigured IMR for interference measurement. The UE performs calculations based on the measurement results of the CMR and IMR to obtain final CSI and reports the final CSI to the base station. The base station then transmits data based on the CSI reported by the UE, and the base station determines precoding for transmitting data to the UE based on a precoding matrix indicator (PMI) reported by the UE.

[0005] For conventional CSI codebooks, the calculation of the two-dimensional codebook indicated by the PMI is two-dimensional (i.e., spatial and frequency domain) channel information obtained by estimating and calculating based on one NZP CSI-RS. However, for Type II Doppler (or Type II Mobility Enhancement, or Type II Doppler) CSI codebooks in the 3rd Generation Partnership Project (3GPP) Release 18 (R18 or Rel-18) protocol, the estimation and calculation are performed based on a CSI-RS burst containing multiple NZP CSI-RSs. Furthermore, channel estimation in the Doppler dimension and three-dimensional (i.e., spatial, frequency, and Doppler domains (also called time domains)) codebook calculation are further introduced. This is very difficult for a UE to implement. How to ensure that a terminal device can calculate three-dimensional channel information in time is an urgent problem to be solved. Summary of the Invention [Means for solving the problem]

[0006] The embodiments of the present application provide a channel measurement method and apparatus to provide a terminal device with more flexible time to complete channel measurement and determine channel information, so as to ensure the communication performance of the terminal device.

[0007] According to a first aspect, there is provided a channel measurement method, the method including: receiving first information indicating K measurement time points for measuring an NZP CSI-RS and m measurement gaps between adjacent measurement time points among the K measurement time points; receiving a measurement signal before a target CSI reference resource based on the first information, the measurement signal including an NZP CSI-RS used for channel measurement, the time-domain position of the target CSI reference resource being associated with at least one of K and m; and reporting CSI at the time-domain position of the CSI report based on the measurement signal.

[0008] In this embodiment of the present application, the first information received by the terminal device from the network device indicates K measurement time points for measuring the NZP CSI-RS and m measurement gaps between adjacent measurement time points among the K measurement time points. In this manner, the terminal device determines a target CSI reference resource based on at least one of K and m, receives a measurement signal before the target CSI reference resource, obtains CSI (measurement results) by calculation based on the received measurement signal, and reports the CSI. In this manner, it is possible to ensure that the terminal device has flexible time to complete CSI operations during channel measurement. In this manner, resource waste caused by excessively long operation times is avoided, and the problem of being unable to support high-speed CSI operations due to excessively short operation times is avoided. As a result, the terminal device's resources are used effectively, and the terminal device's communication performance is guaranteed.

[0009] In a possible design, the measurement signal further includes a channel state information interference measurement CSI-IM signal used for interference measurement.

[0010] In a possible design, the first information may be sent using CSI reporting configuration information.

[0011] In a possible design, before receiving the measurement signal before the target CSI reference resource based on the first information, the method further includes receiving second information, where the second information indicates a time-domain position of the CSI report.

[0012] In a possible design, the second information is sent using radio resource control (RRC) signaling or downlink control information (DCI).

[0013] In a possible design, the NZP CSI-RS may be aperiodic, with the K measurement instances corresponding to the K NZP CSI-RS resources included in the NZP CSI-RS resource set, and the measurement gap corresponding to the time offset difference between adjacent resources within the K NZP CSI-RS resources, or the NZP CSI-RS may be periodic or semi-persistent, with the K measurement instances corresponding to the K measurement instances of the same NZP CSI-RS resource, and the measurement gap corresponding to the periodicity for transmitting the NZP CSI-RS.

[0014] In a possible design, the time domain location of the target CSI reference resource is nn CSI-ref where n is a parameter related to the time-domain position of the CSI report, and the time-domain position of the target CSI reference resource related to at least one of K and m includes at least one of the following: n CSI-ref The value of is related to at least one of K and m, or n CSI-ref teeth

number

number

[0015] In a possible design, n CSI-refThe value of is related to at least one of K and m includes: CSI-ref The value of

number

[0016] The value of Z' being related to at least one of K and m includes the value of Z' f1'(K) being directly proportional to the value of K.

[0017] In this embodiment of the present application, n CSI-ref The value of is determined to be directly proportional to the number K of CSI-RS measurement instants within a CSI-RS burst. Specifically, the time-domain position of the target CSI reference resource increasingly precedes the time-domain position of the CSI report as K increases, and the time for calculating CSI measurement results by the terminal device increases as K increases. This avoids cases where the time for calculating CSI measurement results by the terminal device is insufficient or redundant due to an increase or decrease in the number of received CSI-RSs. In this way, the resources of the terminal device are used effectively, and the communication performance of the terminal device is guaranteed.

[0018] In a possible design, n CSI-ref The value of is related to at least one of K and m includes: CSI-ref The value of

number

[0019] The value of Z' being related to at least one of K and m includes the value of Z' f2'(m) being inversely proportional to the value of m.

[0020] In this embodiment of the present application, n CSI-refThe value of is determined to be inversely proportional to the gap m between CSI-RS measurement time points within a CSI-RS burst. Specifically, as m decreases, the time-domain position of the target CSI reference resource advances more to the time-domain position of the CSI report. As a result, when the gap between CSI-RS measurement time points decreases, the terminal device increases the reserved time for calculating CSI measurement results. Therefore, provided that the gap between two adjacent CSI-RS measurement time points is not too small to complete the calculation of a single CSI measurement result, the calculation can be further completed within the reserved calculation time. In this way, the terminal device's resources are used effectively, and the terminal device's communication performance is guaranteed.

[0021] In a possible design, n CSI-ref The value of is related to at least one of K and m includes: CSI-ref The value of

number

number

[0022] where m1 is a predetermined measurement gap, and f2(K) and f3(K) are functions that are directly proportional to the value of K, such that f3(K)>f2(K).

[0023] the value of Z' being related to at least one of K and m includes the value of Z' being f4'(m, K);

number

[0024] where m2 is a predetermined measurement gap, and f2'(K) and f3'(K) are functions that are directly proportional to the value of K, and satisfy f3'(K)>f2'(K).

[0025] In this embodiment of the present application, nCSI-ref The value of is determined to be directly proportional to the number K of CSI-RS measurement time points within a CSI-RS burst, and a specific related method is determined based on the gap m between measurement time points. In other words, the time-domain position of the target CSI reference resource increasingly precedes the time-domain position of the CSI report as K increases, and increasingly precedes the time-domain position of the CSI report when the gap between measurement time points is less than a predetermined gap m1. In this way, the time reserved by the terminal device for calculating CSI measurement results increases as the number of measurement time points increases. This avoids cases where the terminal device has insufficient or redundant time to calculate CSI measurement results due to an increase or decrease in the number of received CSI-RSs. In addition, the increase amplitude of the reserved time for calculating CSI measurement results can be increased to take into account cases where the gap between measurement time points decreases, so that the terminal device has sufficient measurement time and CSI calculation time for NZP CSI-RS received with small gaps. In this way, the terminal device's resources are effectively used in two aspects, and the communication performance of the terminal device is better guaranteed.

[0026] In a possible design, n CSI-ref The value of is related to at least one of K and m includes: CSI-ref The value of

number

[0027] The value of Z' being related to at least one of K and m includes the value of Z' f3'(m,K) being inversely proportional to the value of m and directly proportional to the value of K.

[0028] In this embodiment of the present application, n CSI-refThe value of is inversely proportional to m and directly proportional to K. In other words, the time-domain position of the target CSI reference resource precedes the time-domain position of the CSI report by a number of times as K increases, and precedes the time-domain position of the CSI report by a number of times as m decreases. In other words, the time reserved by the terminal device for calculating CSI measurement results increases as the number of measurement time points increases and increases as the gap m between measurement time points decreases, and the terminal device ultimately determines the time to calculate the CSI measurement results based on the two factors. Thus, the terminal device can have appropriate time to calculate CSI measurement results for CSI-RS bursts including different numbers of measurement time points, and can also have sufficient time to calculate CSI measurement results for NZP CSI-RS with small gaps. In this way, the terminal device's resources are effectively used in two aspects, and the communication performance of the terminal device is better guaranteed.

[0029] In a possible design, n CSI-ref The value of Z′ being related to at least one of K and m or the value of Z′ being related to at least one of K and m includes the following:

[0030] n CSI-ref or Z' is a constant determined based on at least one of K and m, and n CSI-ref Or Z' satisfies at least one of the following:

[0031] The larger the value of K, the CSI-ref or indicates a large value of Z', or The larger the value of m, the CSI-ref or indicates that the value of Z' is small, or The values ​​of K are divided into h sets, and the set K i All values ​​of K in the set K i+1 The larger or smaller the value of K in i∈(1,h-1), the larger the value of K in different sets, CSI-ref or Z', and all values ​​of K in the same set are CSI-refor corresponds to the same value of Z', the number of values ​​of K in the set is 1 or greater, and h is 2 or greater, or The values ​​of m are divided into q sets, and the set m j All values ​​of m in the set m j+1 The larger or smaller the value of m in j∈(1,q-1), the larger the value of m in different sets, CSI-ref or Z' is small, and all values ​​of m in the same set are CSI-ref or Z', the number of values ​​of m in the set is 1 or greater, and q is 2 or greater.

[0032] In this embodiment of the present application, n CSI-ref The value of (or Z') increases as the value of K increases, or increases stepwise as the value of K increases. This also ensures that the terminal device has adequate time to calculate the CSI measurement results while the number of NZP CSI-RSs in a CSI-RS burst is increasing or decreasing. In this way, resource waste or insufficient calculation time is avoided, and the communication performance of the terminal device is guaranteed. However, n CSI-ref Since the value of (or Z') increases as the value of m decreases, or increases stepwise as the value of m decreases, the terminal device also has enough time to calculate the CSI measurement results of the NZP CSI-RS with small gaps, thereby efficiently using the resources of the terminal device and improving the communication performance of the terminal device.

[0033] Possible designs include at least one of the following: CSI-ref is measured in slots, and Z' is measured in symbols.

[0034] In a possible design, before receiving the measurement signal in the target CSI reference resource based on the first information, the method further includes receiving downlink control information DCI from the network device, where a gap between a time-domain position of the DCI and a time-domain position of the CSI report is equal to or greater than the target time-domain resource Z, and the DCI is used to trigger the CSI report.

[0035] In a possible design, the value of Z is

number

[0036] In a possible design, the value of Z is

number

[0037] According to a second aspect, there is provided a channel measurement method, comprising: transmitting first information, the first information indicating K transmission time points for transmitting an NZP CSI-RS and m transmission gaps between adjacent transmission time points among the K transmission time points; transmitting a measurement signal based on the first information, the measurement signal including the NZP CSI-RS used for channel measurement; and receiving reported CSI, the CSI obtained based on the measurement signal in a target CSI reference resource, a time-domain location of the target CSI reference resource associated with at least one of K and m.

[0038] In a possible design, the measurement signal further includes a channel state information interference measurement CSI-IM signal used for interference measurement.

[0039] In a possible design, transmitting the measurement signal based on the first information includes transmitting the measurement signal before the target CSI reference resource based on the first information.

[0040] In a possible design, the first information may be sent using CSI reporting configuration information.

[0041] In a possible design, before transmitting the measurement signal based on the first information, the method further includes transmitting second information, where the second information indicates a time-domain position of the CSI report.

[0042] In a possible design, the second information is sent using radio resource control (RRC) signaling or downlink control information (DCI).

[0043] In a possible design, the NZP CSI-RS may be aperiodic, with the K transmission instants corresponding to the K NZP CSI-RS resources included in the NZP CSI-RS resource set, and the transmission gap corresponding to the time offset difference between adjacent resources within the K NZP CSI-RS resources, or the NZP CSI-RS may be periodic or semi-persistent, with the K transmission instants corresponding to the K transmission instants of the same NZP CSI-RS resource, and the transmission gap corresponding to the periodicity for transmitting the NZP CSI-RS.

[0044] In a possible design, the time domain location of the target CSI reference resource is nn CSI-ref where n is a parameter related to the time-domain position of the CSI report, and the time-domain position of the target CSI reference resource related to at least one of K and m includes at least one of the following:

[0045] n CSI-ref The value of is related to at least one of K and m, or n CSI-ref teeth

number

number

[0046] In a possible design, n CSI-ref The value of is related to at least one of K and m includes: CSI-ref The value of

number

[0047] The value of Z' being related to at least one of K and m includes the value of Z' f1'(K) being directly proportional to the value of K.

[0048] In a possible design, n CSI-ref The value of is related to at least one of K and m includes: CSI-ref The value of

number

[0049] The value of Z' being related to at least one of K and m includes the value of Z' f2'(m) being inversely proportional to the value of m.

[0050] In a possible design, n CSI-ref The value of is related to at least one of K and m includes: CSI-ref The value of

number

number

[0051] where m1 is a predetermined transmission gap, and f2(K) and f3(K) are functions that are directly proportional to the value of K, such that f3(K)>f2(K).

[0052] the value of Z' being related to at least one of K and m includes the value of Z' being f4'(m, K);

number

[0053] Here, m2 is a predetermined transmission gap, and f2'(K) and f3'(K) are functions that are directly proportional to the value of K, and satisfy f3'(K)>f2'(K).

[0054] In a possible design, n CSI-ref The value of is related to at least one of K and m includes: CSI-ref The value of

number

[0055] The value of Z' being related to at least one of K and m includes the value of Z' f3'(m,K) being inversely proportional to the value of m and directly proportional to the value of K.

[0056] In a possible design, n CSI-ref The value of Z′ being related to at least one of K and m or the value of Z′ being related to at least one of K and m includes the following:

[0057] n CSI-ref or Z' is a constant determined based on at least one of K and m, and n CSI-ref Or Z' satisfies at least one of the following:

[0058] The larger the value of K, the CSI-ref or indicates a large value of Z', or The larger the value of m, the CSI-ref or indicates that the value of Z' is small, or The values ​​of K are divided into h sets, and the set K i All values ​​of K in the set K i+1 The larger or smaller the value of K in i∈(1,h-1), the larger the value of K in different sets, CSI-ref or Z', and all values ​​of K in the same set are CSI-ref or corresponds to the same value of Z', the number of values ​​of K in the set is 1 or greater, and h is 2 or greater, or The values ​​of m are divided into q sets, and the set m j All values ​​of m in the set m j+1 The larger or smaller the value of m in j∈(1,q-1), the larger the value of m in different sets, CSI-ref or Z' is small, and all values ​​of m in the same set are CSI-ref or Z', the number of values ​​of m in the set is 1 or greater, and q is 2 or greater.

[0059] Possible designs include at least one of the following: CSI-ref is measured in slots, and Z' is measured in symbols.

[0060] In a possible design, before transmitting the measurement signal based on the first information, the method further includes transmitting downlink control information DCI, where a gap between a time-domain position of the DCI and a time-domain position of the CSI report is equal to or greater than the target time-domain resource Z, and the DCI is used to trigger the CSI report.

[0061] In a possible design, the value of Z is

number

[0062] In this embodiment of the present application, the network device may determine the value of Z based on the values ​​of m, K, and Z′, and transmit the DCI at a time-domain position where the gap from the time-domain position of the CSI report is equal to or greater than Z, so that the terminal device can correctly receive the measurement signal after the DCI and perform CSI reporting, thereby ensuring the communication performance of the terminal device.

[0063] In a possible design, the value of Z is

number

[0064] In this embodiment of the present application, the network device may determine the value of Z based on the values ​​of m and K, and transmit the DCI at a time-domain position where the gap from the time-domain position of the CSI report is equal to or greater than Z, so that the terminal device can correctly receive the measurement signal after the DCI and perform CSI reporting, thereby ensuring the communication performance of the terminal device.

[0065] According to a third aspect, a communication device is provided. The communication device includes a module or unit configured to implement the method according to the first aspect and any one of the possible designs of the first aspect. The module or unit may be a hardware circuit, software, or a hardware circuit in combination with software. The communication device may be a terminal device, or may be a device (e.g., a chip, chip system, or circuit) within the terminal device or a device that can be used with the terminal device. The device may include: a transceiver unit configured to receive first information, the first information indicating K measurement time points for measuring an NZP CSI-RS and a measurement gap m between adjacent measurement time points among the K measurement time points; a processing unit configured to determine a time-domain location of the target CSI reference resource based on the first information, wherein the time-domain location of the target CSI reference resource is associated with at least one of K and m.

[0066] The transceiver unit is further configured to receive a measurement signal prior to the target CSI reference resource, where the measurement signal includes an NZP CSI-RS used for channel measurement.

[0067] The processing unit is configured to obtain the CSI by calculation based on the measurement signals.

[0068] The transceiver unit is further configured to report the CSI at a time domain location of the CSI report.

[0069] In a possible design, the measurement signal further includes a channel state information interference measurement CSI-IM signal used for interference measurement.

[0070] In a possible design, the first information may be sent using CSI reporting configuration information.

[0071] In a possible design, the transceiver unit is further configured to receive second information, where the second information indicates a time-domain location of the CSI report.

[0072] In a possible design, the second information is sent using radio resource control (RRC) signaling or downlink control information (DCI).

[0073] In a possible design, the NZP CSI-RS may be aperiodic, with the K measurement instances corresponding to the K NZP CSI-RS resources included in the NZP CSI-RS resource set, and the measurement gap corresponding to the slot offset difference between adjacent resources within the K NZP CSI-RS resources, or the NZP CSI-RS may be periodic or semi-persistent, with the K measurement instances corresponding to the K measurement instances of the same NZP CSI-RS resource, and the measurement gap corresponding to the periodicity for transmitting the NZP CSI-RS.

[0074] In a possible design, the time domain location of the target CSI reference resource is nn CSI-ref where n is a parameter related to the time-domain position of the CSI report, and the time-domain position of the target CSI reference resource related to at least one of K and m includes at least one of the following:

[0075] n CSI-ref The value of is related to at least one of K and m, or n CSI-ref teeth

number

number

[0076] In a possible design, n CSI-ref The value of is related to at least one of K and m includes: CSI-ref The value of

number

[0077] The value of Z' being related to at least one of K and m includes the value of Z' f1'(K) being directly proportional to the value of K.

[0078] In a possible design, n CSI-ref The value of is related to at least one of K and m includes: CSI-ref The value of

number

[0079] The value of Z' being related to at least one of K and m includes the value of Z' f2'(m) being inversely proportional to the value of m.

[0080] In a possible design, n CSI-ref The value of is related to at least one of K and m includes: CSI-ref The value of

number

number

[0081] where m1 is a predetermined measurement gap, and f2(K) and f3(K) are functions that are directly proportional to the value of K, such that f3(K)>f2(K).

[0082] the value of Z' being related to at least one of K and m includes the value of Z' being f4'(m, K);

number

[0083] where m2 is a predetermined measurement gap, and f2'(K) and f3'(K) are functions that are directly proportional to the value of K, and satisfy f3'(K)>f2'(K).

[0084] In a possible design, n CSI-ref The value of is related to at least one of K and m includes: CSI-ref The value of

number

[0085] The value of Z' being related to at least one of K and m includes the value of Z' f3'(m,K) being inversely proportional to the value of m and directly proportional to the value of K.

[0086] In a possible design, n CSI-ref The value of Z′ being related to at least one of K and m or the value of Z′ being related to at least one of K and m includes the following:

[0087] n CSI-ref or Z' is a constant determined based on at least one of K and m, and n CSI-ref Or Z' satisfies at least one of the following:

[0088] The larger the value of K, the CSI-ref or indicates a large value of Z', or The larger the value of m, the CSI-ref or indicates that the value of Z' is small, or The values ​​of K are divided into h sets, and the set K i All values ​​of K in the set K i+1 The larger or smaller the value of K in i∈(1,h-1), the larger the value of K in different sets, CSI-ref or Z', and all values ​​of K in the same set are CSI-ref or corresponds to the same value of Z', the number of values ​​of K in the set is 1 or greater, and h is 2 or greater, or The values ​​of m are divided into q sets, and the set m j All values ​​of m in the set m j+1The larger or smaller the value of m in j∈(1,q-1), the larger the value of m in different sets, CSI-ref or Z' is small, and all values ​​of m in the same set are CSI-ref or Z', the number of values ​​of m in the set is 1 or greater, and q is 2 or greater.

[0089] Possible designs include at least one of the following: CSI-ref is measured in slots, and Z' is measured in symbols.

[0090] In a possible design, before receiving a measurement signal in the target CSI reference resource based on the first information, the transceiver unit: and further configured to receive, from the network device, downlink control information DCI, wherein a gap between a time-domain position of the DCI and a time-domain position of the CSI report is equal to or greater than the target time-domain resource Z, and the DCI is used to trigger the CSI report.

[0091] In a possible design, the value of Z is

number

[0092] In a possible design, the value of Z is

number

[0093] According to a fourth aspect, a communication device is provided. The communication device includes a module or unit configured to implement the method according to the second aspect or any one of the possible designs of the second aspect. The module or unit may be a hardware circuit, software, or may be implemented by a hardware circuit in combination with software. The communication device may be a network device, or may be a device (e.g., a chip, chip system, or circuit) within a network device or a device that can be used with a network device. The device may include: a processing unit configured to generate first information, the first information indicating K transmission time points for transmitting the NZP CSI-RS and a transmission gap m between adjacent transmission time points among the K transmission time points; a transceiver unit configured to transmit the first information and further configured to transmit a measurement signal based on the first information, wherein the measurement signal includes an NZP CSI-RS used for channel measurement.

[0094] The transceiver unit is further configured to receive the reported CSI, where the CSI is obtained based on a measurement signal in front of the target CSI reference resource, and the time-domain position of the target CSI reference resource is associated with at least one of K and m.

[0095] In a possible design, the measurement signal further includes a channel state information interference measurement CSI-IM signal used for interference measurement.

[0096] In a possible design, transmitting the measurement signal based on the first information includes transmitting the measurement signal before the target CSI reference resource based on the first information.

[0097] In a possible design, the first information may be sent using CSI reporting configuration information.

[0098] In a possible design, before transmitting the measurement signal based on the first information, the transceiver unit is further configured to transmit second information, where the second information indicates a time-domain position of the CSI report.

[0099] In a possible design, the second information is sent using radio resource control (RRC) signaling or downlink control information (DCI).

[0100] In a possible design, the NZP CSI-RS may be aperiodic, with the K transmission instants corresponding to the K NZP CSI-RS resources included in the NZP CSI-RS resource set, and the transmission gap corresponding to the time offset difference between adjacent resources within the K NZP CSI-RS resources, or the NZP CSI-RS may be periodic or semi-persistent, with the K transmission instants corresponding to the K transmission instants of the same NZP CSI-RS resource, and the transmission gap corresponding to the periodicity for transmitting the NZP CSI-RS.

[0101] In a possible design, the time domain location of the target CSI reference resource is nn CSI-ref where n is a parameter related to the time-domain position of the CSI report, and the time-domain position of the target CSI reference resource related to at least one of K and m includes at least one of the following:

[0102] n CSI-ref The value of is related to at least one of K and m, or n CSI-ref teeth

number

number

[0103] In a possible design, n CSI-refThe value of is related to at least one of K and m by n CSI-ref The value of

number

[0104] In a possible design, n CSI-ref The value of is related to at least one of K and m includes: CSI-ref The value of

number

[0105] In a possible design, n CSI-ref The value of is related to at least one of K and m includes: CSI-ref The value of

number

number

[0106] where m1 is a predetermined transmission gap, and f2(K) and f3(K) are functions that are directly proportional to the value of K, such that f3(K)>f2(K).

[0107] the value of Z' being related to at least one of K and m includes the value of Z' being f4'(m, K);

number

[0108] Here, m2 is a predetermined transmission gap, and f2'(K) and f3'(K) are functions that are directly proportional to the value of K, and satisfy f3'(K)>f2'(K).

[0109] In a possible design, n CSI-ref The value of is related to at least one of K and m includes: CSI-ref The value of

number

[0110] The value of Z' being related to at least one of K and m includes the value of Z' f3'(m,K) being inversely proportional to the value of m and directly proportional to the value of K.

[0111] In a possible design, n CSI-ref The value of Z′ being related to at least one of K and m or the value of Z′ being related to at least one of K and m includes the following:

[0112] n CSI-ref or Z' is a constant determined based on at least one of K and m, and n CSI-ref Or Z' satisfies at least one of the following:

[0113] The larger the value of K, the CSI-ref or indicates a large value of Z', or The larger the value of m, the CSI-ref or indicates that the value of Z' is small, or The values ​​of K are divided into h sets, and the set K i All values ​​of K in the set K i+1 The larger or smaller the value of K in i∈(1,h-1), the larger the value of K in different sets, CSI-ref or Z', and all values ​​of K in the same set are CSI-refor corresponds to the same value of Z', the number of values ​​of K in the set is 1 or greater, and h is 2 or greater, or The values ​​of m are divided into q sets, and the set m j All values ​​of m in the set m j+1 The larger or smaller the value of m in j∈(1,q-1), the larger the value of m in different sets, CSI-ref or Z' is small, and all values ​​of m in the same set are CSI-ref or Z', the number of values ​​of m in the set is 1 or greater, and q is 2 or greater.

[0114] Possible designs include at least one of the following: CSI-ref is measured in slots, and Z' is measured in symbols.

[0115] In a possible design, before transmitting the measurement signal based on the first information, the transceiver unit is further configured to transmit downlink control information DCI, where a gap between a time-domain position of the DCI and a time-domain position of the CSI report is equal to or greater than the target time-domain resource Z, and the DCI is used to trigger the CSI report.

[0116] In a possible design, the value of Z is

number

[0117] In a possible design, the value of Z is

number

[0118] According to a fifth aspect, there is provided a communications apparatus including a processor, the processor configured to perform a method according to the first aspect or any one of possible designs of the first aspect by executing computer instructions or by using logic circuitry.

[0119] In a possible design, the communications device includes a memory configured to store computer instructions, optionally the memory and the processor being integrated.

[0120] In one possible design, the communications device further includes a transceiver configured to receive and / or transmit signals, the signals may carry signaling or data.

[0121] The communication device is a terminal device or a device within a terminal device.

[0122] According to a sixth aspect, there is provided a communications apparatus including a processor, the processor configured to perform a method according to the second aspect or any one of possible designs of the second aspect by executing computer instructions or by using logic circuitry.

[0123] In a possible design, the communications device includes a memory configured to store computer instructions, optionally the memory and the processor being integrated.

[0124] In one possible design, the communications device further includes a transceiver configured to receive and / or transmit signals, the signals may carry signaling or data.

[0125] A communication device is a network device or a device within a network device.

[0126] According to a seventh aspect, an embodiment of the present application provides a chip system including a processor, the processor coupled to a memory, the memory configured to store a program or instruction, which, when executed by the processor, enables the chip system to perform a method according to either the first or second aspect.

[0127] Optionally, the chip system further includes an interface circuit, the interface circuit configured to exchange computer instructions with the processor.

[0128] Optionally, the chip system may have one or more processors, which may be implemented using hardware or software. When the processor is implemented using hardware, the processor may be a logic circuit or an integrated circuit, etc. When the processor is implemented using software, the processor may be a general-purpose processor and is implemented by reading software code stored in a memory.

[0129] Optionally, there may also be one or more memories in the chip system. The memory may be integrated with the processor or may be located separately from the processor. This is not limited in this application. For example, the memory may be a non-transitory processor, such as a read-only memory (ROM). The memory and the processor may be integrated in the same chip or may be located separately on separate chips. The type of memory and the manner in which the memory and the processor are located are not specifically limited in this application.

[0130] According to an eighth aspect, an embodiment of the present application provides a computer-readable storage medium, the computer-readable storage medium storing a computer program or instructions, the computer program or instructions being executed to enable a computer to perform a method according to any one of the first and second aspects.

[0131] According to a ninth aspect, an embodiment of the present application provides a computer program product, which, when read and executed by a computer, enables the computer to perform a method according to any one of the possible implementations of the first aspect or the second aspect.

[0132] According to a tenth aspect, an embodiment of the present application provides a communication system, the communication system including an apparatus according to the third aspect and / or the fourth aspect.

[0133] In order to describe the technical solutions of the embodiments of the present application more clearly, the following briefly describes the accompanying drawings for illustrating the embodiments. [Brief explanation of the drawings]

[0134] [Figure 1A] 1 is a diagram of the structure of a communication system according to an embodiment of the present application; [Figure 1B] FIG. 2 is a diagram of the structure of another communication system according to an embodiment of the present application; [Figure 1C] 1 is a diagram of the structure of a network element of a communication system according to an embodiment of the present application; [Figure 2A] 1 is a flowchart illustrating a method for performing CSI measurements by a network device and a terminal device according to an embodiment of the present application. [Figure 2B] FIG. 1 is a diagram of NZP CSI-RS resources configured by a network device according to one embodiment of the present application. [Figure 2C] FIG. 2 is a diagram of a CSI-RS burst according to one embodiment of the present application. [Figure 3A] 3 is a flowchart of a channel measurement method according to an embodiment of the present application; [Figure 3B] FIG. 1 is a diagram of a target CSI reference resource according to an embodiment of the present application. [Figure 3C] FIG. 1 is a diagram of a partition set of values ​​of K according to an embodiment of the present application. [Figure 3D] FIG. 2 is a diagram of a partition set of m values ​​according to an embodiment of the present application. [Figure 4] 1 is a diagram of the structure of a communication device according to an embodiment of the present application; [Figure 5] 1 is a diagram of a hardware structure of a communication device according to an embodiment of the present application; DETAILED DESCRIPTION OF THE INVENTION

[0135] In the specification, claims, and accompanying drawings of this application, terms such as "first," "second," "third," and "fourth" are used to distinguish different objects and do not indicate a particular order. In addition, the terms "comprise," "have," and any other variations thereof are intended to cover a non-exclusive inclusion. For example, a process, method, system, product, or device that includes a series of steps or units is not limited to the listed steps or units, but may optionally include additional steps or units that are not listed, or may optionally include additional steps or units that are specific to the process, method, product, or device.

[0136] The term "embodiment" as used herein means that a particular feature, structure, or characteristic described with reference to an embodiment may be included in at least one embodiment of the present application. Phrases appearing in various places in this specification may not necessarily refer to the same embodiment, and are not an exclusive, independent, or optional embodiment of another embodiment. It is explicitly and implicitly understood by those skilled in the art that an embodiment described herein may be combined with another embodiment.

[0137] "Multiple" means two or more than two. The term "and / or" describes an associative relationship for describing related objects and indicates that three relationships may exist. For example, A and / or B may represent three cases: when only A is present, when both A and B are present, and when only B is present. The symbol " / " typically indicates an "or" relationship between associated objects.

[0138] In the embodiments of the present application, an "indication" may include a direct indication and an indirect indication, or an explicit indication and an implicit indication. The phrase "specific indication information indicates A" or "indication information of A" may include that the indication information directly indicates A or indirectly indicates A, but does not necessarily mean that the indication information conveys A. Information indicated by specific information (e.g., a measurement gap or a transmission gap in the following description) is referred to as information to be indicated. In a specific implementation, the information to be indicated may be indicated in multiple ways, for example, but not limited to, a way of directly indicating the information to be indicated, or a way of indicating the information to be indicated or an index of the information to be indicated. Alternatively, the information to be indicated may be indirectly indicated by indicating other information, and there is an association relationship between the other information and the information to be indicated. Alternatively, only a part of the information to be indicated may be indicated, and the other part of the information to be indicated is known or agreed upon in advance. For example, the specific information may alternatively be indicated using a pre-agreed arrangement sequence of multiple pieces of information (e.g., specified in a protocol) to reduce indication overhead to some extent. Furthermore, common portions of all information can be identified and presented in a unified manner, reducing the pointing overhead caused by presenting the same information separately.

[0139] First, a communication system according to an embodiment of the present application will be described with reference to the drawings.

[0140] 1A is a diagram of the structure of a communication system according to an embodiment of the present application. As shown in FIG. 1A, the communication system includes one network device 101 and six terminal devices. The six terminal devices are terminal device 102, terminal device 103, terminal device 104, terminal device 105, terminal device 106, and terminal device 107, respectively. In the communication system, terminal device 102 to terminal device 107 can transmit uplink data to network device 101, and network device 101 receives the uplink data transmitted by terminal device 102 to terminal device 107. In addition, terminal device 105 to terminal device 107 may constitute a communication system. In the communication system, network device 101 can transmit downlink information to terminal device 102, terminal device 103, terminal device 105, etc. Terminal device 105 can also transmit downlink information to terminal device 106 and terminal device 107. In the example shown in FIG. 1A, terminal device 102 is a vehicle, terminal device 103 is a smart air conditioner, terminal device 104 is a smart fuel dispenser, terminal device 105 is a mobile phone, terminal device 106 is a smart teacup, and terminal device 107 is a printer.

[0141] 1B is a diagram of another communication system structure according to an embodiment of the present application. As shown in FIG. 1B, the communication system includes a plurality of network devices 201, 202, and 203, and a plurality of terminal devices 204, 205, and 206. The plurality of network devices 201 to 203 can simultaneously provide services to one terminal device 205.

[0142] The terminal device in the embodiments of the present application, which may be abbreviated as a terminal or UE, is a device having a wireless transceiver function. The terminal device may be indoors or outdoors, handheld, or installed on land, including in a vehicle, on water (e.g., on a ship), or in the air (e.g., on an aircraft, unmanned aerial vehicle, balloon, or satellite). The terminal device may be a mobile phone, a tablet computer, a computer with a wireless transceiver function, a virtual reality terminal device, an augmented reality terminal device, a wireless terminal device for industrial control, a wireless terminal device for autonomous driving, a wireless terminal device for telemedicine, a wireless terminal device for smart grids, a wireless terminal device for road safety, a wireless terminal device for smart cities, or a wireless terminal device for smart homes. The terminal device may be fixed or mobile. This is not a limitation in the embodiments of the present application.

[0143] In the embodiments of the present application, the apparatus configured to perform the functions of the terminal may be a terminal device, or may be an apparatus capable of supporting the terminal device in performing the functions, such as a chip system. The apparatus may be mounted on the terminal device. In the embodiments of the present application, the chip system may include a chip, or may include a chip and other discrete components. In the technical solutions provided in the embodiments of the present application, the technical solutions are described using an example in which the apparatus configured to perform the functions of the terminal device is a terminal device.

[0144] The network device is a radio access network (RAN) node (or device) that connects a terminal to a wireless network, also called a base station. It may be an evolved NodeB (eNB or eNodeB) in an LTE system, or a radio controller in a cloud radio access network (CRAN) scenario. Alternatively, the network device may be a relay station, an access point, an in-vehicle device, a wearable device, a network device in a 5G network, a network device in a future evolved wireless communication network, or one or a group of antenna panels (including multiple antenna panels) of a base station in a 5G system. It may also be a next-generation NodeB (gNB or ng-eNB) or a network node constituting a transmission point, such as a baseband unit (BBU) or a distributed unit (DU). This is not a limitation in the embodiments of the present application.

[0145] In some deployments, a gNB may include a central unit (CU) and a DU. The gNB may further include an active antenna unit (AAU). The CU performs some functions of the gNB, and the DU performs some functions of the gNB. For example, the CU is responsible for processing non-real-time protocols and services and performs functions of the radio resource control (RRC) layer and packet data convergence protocol (PDCP) layer. The DU is responsible for processing physical layer protocols and real-time services and performs functions of the radio link control (RLC) layer, media access control (MAC) layer, and physical (PHY) layer. The AAU performs some physical layer processing functions, radio frequency processing, and functions related to active antennas. RRC layer information is ultimately converted to or from PHY layer information. Therefore, in this architecture, higher layer signaling, such as RRC layer signaling, may also be considered to be transmitted by the DU, or by the DU and AAU. It will be understood that a network device may be a device including one or more of a CU node, a DU node, and an AAU node. In addition, a CU may be classified as a network device in an access network (radio access network, RAN), or a CU may be classified as a network device in a core network (CN). This is not limited in the present application.

[0146] Furthermore, Figure 1C is a diagram of the structure of a network element of a communication system according to an embodiment of the present application. As shown in Figure 1C, the network device and the terminal device respectively include an RRC layer, a MAC layer, and a PHY layer, and the RRC signaling exchange module, the MAC signaling exchange module, and the PHY signaling exchange module between the network device and the terminal device are constructed separately. The RRC signaling exchange module is a module used by the network device and the terminal device to send and receive RRC signaling. The MAC signaling exchange module is a module used by the network device and the terminal device to send and receive MAC control element (CE) signaling. The PHY signaling exchange module is a module used by network devices and terminal devices to transmit and receive uplink control signaling (via a physical uplink control channel (PUCCH)) or downlink control signaling (via a physical downlink control channel (PDCCH)) and uplink data (via a physical uplink shared channel (PUSCH)) or downlink data (via a physical downlink shared channel (PDSCH)).

[0147] Hereinafter, an embodiment of the present application will be described with reference to the accompanying drawings.

[0148] 2A is a flowchart of performing CSI measurement by a network device and a terminal device according to an embodiment of the present application. As shown in FIG. 2A, the CSI measurement procedure includes the following steps:

[0149] (1) A network device transmits channel measurement configuration information to a terminal device to notify the terminal device of a channel measurement time and a channel measurement behavior. The channel measurement configuration information may, for example, include a CMR or may further include an IMR corresponding to the CMR.

[0150] (2) The network device transmits a pilot (i.e., a channel state information reference signal (CSI-RS)) to the terminal device for channel measurement. In NR, the network device transmits an NZP CSI-RS for the terminal device to detect the downlink channel, and the terminal device receives the NZP CSI-RS on a preconfigured CMR for channel estimation. In addition, the terminal device may further receive a channel state information interference measurement (CSI-IM) signal on a preconfigured IMR for interference measurement. The terminal device obtains the final CSI report amount through calculation based on the measurement results of the CMR and IMR.

[0151] (3) The terminal device performs CSI reporting based on the pilot measurement result (or further including the interference measurement result). The CSI reporting amount is obtained by calculation based on the pilot measurement result (or further including the interference measurement result), and the CSI reporting amount is transmitted to the network device, i.e., the CSI reporting is completed. Specifically, the CSI reporting amount may include a channel rank indicator (RI) used by the network device to determine the amount of streams for transmitting data to the terminal device, may further include a channel quality indicator (CQI) (determined based on both the pilot measurement result and the interference measurement result) used by the network device to determine a modulation order and a channel coding rate for transmitting data to the terminal device, and may further include a PMI used by the network device to determine precoding for transmitting data to the terminal device.

[0152] (4) The network device transmits data based on the CSI reported by the terminal device.

[0153] The CMR used to transmit the NZP CSI-RS (NZP CSI-RS resource for short) and the IMR used to transmit the CSI-IM signal (CSI-IM resource for short) may be periodic, semi-persistent, or aperiodic. Both the periodic / semi-persistent / aperiodic NZP CSI-RS resource and the CSI-IM resource are configured in the terminal device using higher layer signaling. Referring to Figure 2B, the NZP CSI-RS resource (which has the same principle as that of the CSI-IM resource) is used as an example for explanation. Figure 2B is a diagram of the NZP CSI-RS resource configured by the network device according to one embodiment of the present application.

[0154] 1. The periodic NZP CSI-RS resource is configured by the network device for the terminal device using RRC signaling, and includes the periodicity m of the NZP CSI-RS resource. In the periodic NZP CSI-RS resource, the transmission time of the CSI-RS is determined according to the following formula:

number

[0155] where:

number

[0156] 2. For semi-persistent NZP CSI-RS resources, the network device may also use RRC signaling to configure the terminal device with NZP CSI-RS resources with a periodicity of m. The difference from periodic NZP CSI-RS resources is that the network device further activates or deactivates the NZP CSI-RS resources using signaling, and during the activation period, the terminal device receives the NZP CSI-RS with a fixed periodicity of m based on the time-domain position offset indicated by the NZP CSI-RS resources.

[0157] 3. For aperiodic NZP CSI-RS resources, the network device may configure an NZP CSI-RS resource set (NZP-CSI-RS-ResourceSet) for the terminal device using higher layer signaling (RRC signaling). Each NZP CSI-RS resource set includes one NZP CSI-RS resource. A slot offset s is configured for each NZP CSI-RS resource set to determine the slot in which the NZP CSI-RS resource in the set is located, i.e., the slot for transmitting the NZP CSI-RS. The network device can associate the aperiodic NZP CSI-RS resource set with the aperiodic CSI report using higher layer signaling (RRC signaling, or RRC signaling and MAC CE signaling). The network device triggers the aperiodic CSI report using DCI. When aperiodic CSI reporting is activated, the aperiodic NZP CSI-RS resource set associated with the aperiodic CSI reporting is also activated. The slot corresponding to the NZP CSI-RS resource set is the slot in which the activated DCI is located plus slot offset s. For example, if the slot offset is 0, the NZP CSI-RS resource set and the DCI are in the same slot. The specific symbol in the same slot in which the NZP CSI-RS resource in the NZP CSI-RS resource set is located may be configured in the NZP CSI-RS resource configuration information.

[0158] Furthermore, CSI reporting may be periodic, semi-persistent, or aperiodic, as detailed below.

[0159] 1. Periodic CSI reporting (P-CSI): A network device configures periodic CSI reporting for a terminal device using higher layer signaling (RRC signaling), and the terminal device performs channel measurements based on the periodic NZP CSI-RS resource and transmits CSI reports at fixed time intervals (i.e., the CSI reporting periodicity configured by the network device).

[0160] 2. Semi-persistent CSI reporting (SP-CSI): When a terminal device is configured to perform semi-persistent CSI reporting, the terminal device starts CSI reporting only after receiving downlink activation signaling sent by the network device and terminates CSI reporting after receiving downlink deactivation signaling. The terminal device performs periodic CSI measurement and reporting between the time points for delivering two downlink signalings. The NZP CSI-RS resource used for semi-persistent CSI reporting may be periodic or semi-persistent. Semi-persistent CSI reporting may be performed on PUCCH resources, and the network device activates and deactivates semi-persistent CSI reporting using downlink upper layer signaling (MAC CE signaling). Alternatively, semi-persistent CSI reporting may be performed on PUSCH resources, and the network device activates and deactivates semi-persistent CSI reporting using physical layer downlink control signaling (DCI).

[0161] 3. Aperiodic CSI Reporting (AP-CSI): The aperiodic CSI reporting and measurement process is as follows: The network device first semi-statically configures configuration parameters for multiple timings of the CSI reporting of the terminal device using downlink RRC signaling and triggers one or more timings of the CSI reporting using DCI. The terminal device performs CSI measurement based on the configuration parameters of the CSI reporting and transmits the CSI report via PUSCH. Similar to semi-persistent CSI measurement and CSI reporting, both aperiodic CSI measurement and CSI reporting need to be triggered by the network device, but it should be noted that aperiodic CSI measurement and CSI reporting do not need to be deactivated after being triggered using DCI. The NZP CSI-RS resource used for aperiodic CSI reporting can be periodic, semi-persistent, or aperiodic.

[0162] In practical systems, there is a delay in CSI reporting, which causes the CSI expiration problem. Specifically, there is a delay between the CSI in the CSI report and the actual channel CSI. This problem causes a significant performance loss for terminal devices in medium- to high-speed mobility scenarios. CSI expiration is essentially caused by the time-varying characteristics of the channel and corresponds to Doppler changes.

[0163] The PMI in a conventional Type II CSI codebook generally includes two dimensions: the spatial domain (corresponding to the angular domain) and the frequency domain (corresponding to the delay domain). In the Type II Doppler (mobility enhanced) codebook described in R18, a new Doppler domain is introduced, and the PMI represents a three-dimensional precoding matrix: the spatial domain, the frequency domain, and the time domain (corresponding to the Doppler domain). To implement CSI feedback based on the Type II Doppler codebook in R18, CSI-RS-based channel measurements must be performed at multiple timings to obtain Doppler information. Specifically, the NZP CSI-RS used for channel measurement must form a burst (CSI-RS burst), and the terminal device uses the NZP CSI-RS within the burst as a channel measurement resource for CSI measurement of the Type II Doppler codebook.

[0164] 2C is a diagram of a CSI-RS burst according to one embodiment of the present application. As shown in FIG. 2C, the NZP CSI-RS transmitted at K transmission times within the dashed box form a CSI-RS burst. In this embodiment of the present application, the CSI-RS burst has the following meaning:

[0165] (1) CSI-RS burst corresponding to periodic NZP CSI-RS resources (periodic CSI-RS burst): One NZP CSI-RS resource is configured using RRC signaling, and the NZP CSI-RS resource corresponds to K transmission instants and a periodicity of m. The NZP CSI-RS resource indicates a time-domain position offset and is used to determine the transmission instant at which a network device transmits an NZP CSI-RS on the NZP CSI-RS resource with reference to the periodicity m and another parameter. The K identical CSI-RSs transmitted by a network device with a period of m starting from transmission instant 1 form a CSI-RS burst.

[0166] (2) CSI-RS burst corresponding to semi-persistent NZP CSI-RS resource (semi-persistent CSI-RS burst): The method for configuring semi-persistent CSI-RS resource is the same as the method for configuring periodic CSI-RS resource, with the main difference being that semi-persistent CSI-RS resource can be activated and deactivated. Correspondingly, the transmission time 1 of the first NZP CSI-RS in the CSI-RS burst and the number of transmission timings of subsequent NZP CSI-RS (or K transmission time points of the CSI-RS burst) are determined by the time points of activation signaling and deactivation signaling.

[0167] (3) CSI-RS burst corresponding to aperiodic NZP CSI-RS resources (non-periodic CSI-RS burst): In a Type II Doppler codebook, signal enhancement is performed on aperiodic CSI-RS resources. Specifically, the NZP CSI-RS resource set configured by the network device for the terminal device using higher layer signaling includes K (K>1) non-periodic NZP CSI-RS resources, and the network device repeatedly transmits the same CSI-RS on the K non-periodic NZP CSI-RS resources to achieve the signal enhancement effect. The time offset difference between adjacent NZP CSI-RS resources among the K NZP CSI-RS resources is m. The slot offsets of the NZP CSI-RS resources among the K non-periodic NZP CSI-RS resources relative to the DCI activation positions are different (the DCI activation positions are the aforementioned time-domain positions at which the network device transmits DCI to trigger the non-periodic CSI reporting associated with the NZP CSI-RS resource set). Such a slot offset difference is caused by a time offset difference m between the K NZP CSI-RS resources. The time offset difference may be a subframe offset difference, a slot offset difference, a symbol offset difference, another time-domain offset difference, or a combination of several time-domain offset differences (e.g., the time offset difference between transmission time i and transmission time i+1 is 1 slot and 2 symbols). This is not limited in this application. In this case, m may be measured in one or a combination of subframes, slots, or symbols. The K NZP CSI-RS transmitted on the K NZP CSI-RS resources form a CSI-RS burst.

[0168] From the above description, it can be seen that there are K (K>1) measurement time points in each CMR of CSI measurements of a Type II Doppler codebook. The difference is that for periodic CSI-RS bursts and semi-persistent CSI-RS bursts, the NZP CSI-RS transmitted by a network device at the K transmission time points belongs to the same NZP CSI-RS resource. The transmission gap m between two transmission time points corresponds to the measurement periodicity at which the terminal device performs NZP CSI-RS measurements on the NZP CSI-RS resource. For aperiodic NZP CSI-RS bursts, the NZP CSI-RS transmitted by a network device at each of the K transmission time points belongs to a separate NZP CSI-RS resource. The transmission gap m between two transmission time points is the difference between the slot offsets of two adjacent aperiodic NZP CSI-RS resources. After the CMRs of different CSI measurements are configured for the terminal device, the terminal device determines K NZP CSI-RS measurement time points based on the K transmission time points, receives the NZP CSI-RS at each of the K measurement time points, and obtains channel information in the spatial domain and the frequency domain through estimation. The terminal device can then obtain Doppler information based on the channel information at the K measurement time points, perform channel prediction, and perform channel quantization compression on the predicted channel information on a three-dimensional codebook based on the spatial domain-frequency domain-Doppler domain to obtain CSI measurement results, and transmit the CSI measurement results to the network device.

[0169] In the prior art, a fixed time is set for calculating CSI measurement results for an NZP CSI-RS within a CSI-RS burst. Specifically, a CSI reference resource is defined in new radio (NR) and indicates a time-frequency resource within several slots before the slot in which the CSI is reported. A terminal device receives a measurement signal before the CSI reference resource and reports the CSI measurement results at a time-domain position of the CSI report indicated by the network device. In this case, the terminal device needs to complete the calculation of the CSI measurement results within the gap between the time-domain position of the CSI reference resource and the time-domain position of the CSI report (i.e., the time for calculating the CSI measurement results). The time-domain position of the CSI report includes the slot in which the terminal device reports (transmits) the CSI to the network device. Optionally, the time-domain position of the CSI report further includes the subframe in which the CSI is reported. Furthermore, the time-domain position of the CSI report may further include a specific symbol within the slot in which the CSI is reported. In another possible method, the time-domain position of the CSI report includes the subframe in which the terminal device reports (transmits) the CSI to the network device. In yet another possible method, the time domain location of the CSI report includes one or more symbols at which the terminal device reports (transmits) the CSI to the network device.

[0170] The terminal device determines a related parameter n of the time-domain position of the CSI report (n may be a time-domain position of the CSI report and directly indicated to the terminal device by the network device, or may be a parameter determined by the terminal device based on the time-domain position of the CSI report and indicated by the network device), and the time-domain position of the CSI reference resource is nn CSI-ref where nn CSI-ref indicates the time-domain gap between the time-domain location of the CSI reference resource and n. For periodic or semi-persistent CSI reporting, if the number of NZP CSI-RS resources bound to the CSI report and used for channel measurement is 1, then n CSI-ref teeth

number

number

number

number

[0171] However, for different CSI-RS bursts, some bursts contain fewer measurement signals, resulting in a very long fixed time, which leads to a waste of resources. Some bursts contain more measurement signals, resulting in an extremely short fixed time, which results in insufficient time for calculating CSI measurement results. Furthermore, measurement gaps between measurement signals are different, and the fixed time may also result in an insufficient measurement gap for completing calculation of a single CSI-RS measurement result. As a result, the communication performance of the terminal device cannot be ensured.

[0172] In particular, in the case of CSI calculation using a 3D codebook in which the Doppler domain is introduced, if the time used to perform calculations based on the 3D codebook is fixed, this does not help with channel information calculations for different CSI-RS bursts. Furthermore, if the time gap between multiple NZP CSI-RS measurement times within the same NZP CSI-RS burst is small, it is difficult for a terminal device to even complete the calculation of time-frequency 2D channel information based on the NZP CSI-RS received in a single NZP CSI-RS occasion. As a result, it is difficult for a terminal device to support medium- to high-speed CSI operations, or it is necessary to incur high hardware costs to support medium- to high-speed CSI operations. How to provide a terminal device with more flexible time for calculating CSI measurement results based on a Type II Doppler codebook and completing CSI feedback is a technical problem to be solved by embodiments of the present application.

[0173] In view of this, Figure 3A is a flowchart of a channel measurement method according to an embodiment of the present application. As shown in Figure 3A, the method includes the following steps:

[0174] 301: A network device transmits first information to a terminal device, where the first information indicates K transmission time points for transmitting an NZP CSI-RS and m transmission gaps between adjacent transmission time points among the K transmission time points.

[0175] First, it should be noted that in this embodiment of the present application, the K transmission time points at which a network device transmits the NZP CSI-RS and the K measurement time points at which a terminal device receives the NZP CSI-RS have the same meaning. The terminal device receives the NZP CSI-RS, i.e., the terminal device measures the NZP CSI-RS. It can be seen that for a network device, the NZP CSI-RS is a transmission signal, while for a terminal device, the NZP CSI-RS is a received signal, which may also be referred to as a measurement signal. Similarly, the transmission gap m between any two transmission time points among the K transmission time points and the measurement gap m between any two measurement timings among the K measurement time points have the same meaning. This description is applicable to all the following embodiments and will not be described in detail below. m may be measured in slots (e.g., in the case of periodic CSI-RS bursts or semi-persistent CSI-RS bursts), or in one or a combination of subframes, slots, or symbols (e.g., in the case of aperiodic CSI-RS bursts).

[0176] In this embodiment of the present application, the CSI measurement results calculated by the terminal device are calculated through channel measurements based on a mobility-enhanced codebook to enable the CSI measurement results calculated by the terminal device to include the Doppler domain and improve the performance of the terminal device in high-speed scenarios. In other words, the network device transmits NZP CSI-RS to the terminal device at K timings to form a burst (CSI-RS burst), and the terminal device performs measurements based on the measurement signals in the CSI-RS burst. For a specific description of the CSI-RS burst, please refer to the related description of Figure 2C.

[0177] First, the network device transmits first information to the terminal device to indicate K and m. K and m in this specification relate to the aforementioned CSI-RS burst and may be referred to as CSI-RS burst information. Specifically, K indicates that the number of corresponding timings at which the network device transmits the NZP CSI-RS in the CSI-RS burst is K (the NZP CSI-RS corresponds to K transmission time points), and m indicates the time gap between adjacent transmission time points among the K transmission time points. Here, K is an integer greater than 1, and m is greater than 0.

[0178] In a possible implementation, the first information includes K and m.

[0179] In another possible implementation form, the first information includes some information of K and m. For example, to reduce overhead, a default value is predefined for K, and the default value is known to both the network device and the terminal device. In this case, the K indicated by the first information may be a difference between the value of K and the default value, etc.

[0180] Optionally, the NZP CSI-RS is aperiodic, the K measurement instances correspond to the K NZP CSI-RS resources included in the NZP CSI-RS resource set, and the measurement gap corresponds to a time offset difference between adjacent NZP CSI-RS resources among the K NZP CSI-RS resources. Alternatively, the NZP CSI-RS is periodic or semi-persistent, the K measurement instances correspond to the K measurement instances of the same NZP CSI-RS resource, and the measurement gap corresponds to the periodicity for measuring the NZP CSI-RS.

[0181] In other words, if the NZP CSI-RS in a CSI-RS burst is a signal transmitted on aperiodic NZP CSI-RS resources, the number K of timings of signal measurements performed by the terminal device may correspond to the K NZP CSI-RS resources included in the NZP CSI-RS resource set. The measurement gap m corresponds to the time offset difference m between adjacent NZP CSI-RS resources among the K NZP CSI-RS resources. If the NZP CSI-RS in a CSI-RS burst is a signal transmitted on periodic or semi-persistent NZP CSI-RS resources, the number K of timings of signal measurements performed by the terminal device may correspond to the K measurement time points indicated by the same NZP CSI-RS resource, and the measurement gap m corresponds to the periodicity m for measuring the NZP CSI-RS. For specific related descriptions of K and m for periodic NZP CSI-RS resources, periodic NZP CSI-RS resources, or semi-persistent NZP CSI-RS resources, please refer to the related description of Figure 2B. The details will not be repeated here.

[0182] Optionally, the first information is transmitted using CSI reporting configuration information. For example, the CSI reporting configuration information may be higher-layer signaling CSI reporting configuration (CSI-ReportingConfig) (i.e., the CSI reporting configuration information may be carried by higher-layer signaling, for example, by RRC signaling), and the RRC signaling may be a CSI measurement configuration message, etc. The CSI-ReportingConfig includes a codebook configuration (codebookConfig), which includes a codebook type (codebookType), which is used to determine that the CSI-ReportingConfig performs CSI measurement based on a Type II Doppler codebook. Furthermore, the CSI-ReportingConfig includes resourcesForChannelMeasurement and csi-IM-ResourceForInterference, which are associated with resources of CSI-RS bursts for channel measurement and CSI-IM resource sets for interference measurement, respectively.

[0183] 302: The terminal device receives first information, and receives a measurement signal before the target CSI reference resource based on the first information, where the measurement signal includes an NZP CSI-RS for channel measurement. The time-domain location of the target CSI reference resource is related to at least one of K and m. In other words, the time-domain location of the target CSI reference resource is related not only to the time-domain location of the CSI report but also to at least one of K and m.

[0184] As described above, the gap between the time-domain position of the CSI reference resource and the time-domain position of the CSI report is used to calculate the CSI measurement result. The CSI reference resource in this embodiment of the present application is called the target CSI reference resource. In this case, to ensure that the terminal device has enough time to calculate the CSI and obtain the reported information, in this embodiment of the present application, the measurement signal received by the terminal device is a signal before the time-domain position of the target CSI reference resource.

[0185] The measurement signal may include an NZP CSI-RS or may further include a CSI-IM signal. In other words, the NZP CSI-RS independently transmitted by the network device and received by the terminal device, or the NZP CSI-RS and CSI-IM signals jointly transmitted by the network device and received by the terminal device, need to be located before the time domain position of the target CSI reference resource.

[0186] Optionally, before receiving the measurement signal before the target CSI reference resource based on the first information, the method further includes receiving second information, where the second information indicates a time-domain position of the CSI report.

[0187] In this embodiment of the present application, the manner in which the terminal device acquires the time-domain location of the CSI report may be indicated by the network device by transmitting the second information. Alternatively, the time-domain location of the CSI report may be acquired by the terminal device in another manner, for example, from another device, or may be determined by the network device and the terminal device using predefined information. This is not limited in this embodiment of the present application.

[0188] Optionally, the second information is transmitted using radio resource control RRC signaling or downlink control information DCI.

[0189] Specifically, for aperiodic CSI reporting, the time-domain location of the CSI report may be determined and triggered by the DCI. For periodic or semi-persistent CSI reporting, the time-domain location of the CSI report may be transmitted using CSI reporting configuration information, which may be specifically carried in RRC signaling for transmission.

[0190] 3B is a diagram of a target CSI reference resource according to an embodiment of the present application, illustrating that the time-domain location of the target CSI reference resource is related to the time-domain location of the CSI report. As shown in FIG. 3B, it is assumed that the related parameter of the time-domain location of the CSI report is n, where n may be directly instructed by the network device to the terminal device or may be ultimately determined by the terminal device based on the time-domain location of the CSI report instructed by the network device. When the time-domain location of the target CSI reference resource is n, CSI-ref If the terminal device is nn CSI-ref , receiving the CSI-RS transmitted by the network device in the CSI-RS burst and performing channel measurements.

[0191] In the above description, it is assumed that the time domain position of the CSI reported and indicated by the network device to the terminal device is n'. Considering the problem that the uplink subcarrier spacing and the downlink subcarrier spacing do not match, the value of n is

number

[0192] [Table 1]

[0193] Assuming that the uplink subcarrier spacing is the same as the uplink subcarrier spacing and the downlink subcarrier spacing, n = n'. Assuming that the uplink subcarrier spacing is different from the downlink subcarrier spacing, the corresponding configuration parameter μ can be determined based on the uplink subcarrier spacing and the downlink subcarrier spacing, and then the value of n is further determined.

[0194] where n may be measured in slots, and n CSI-ref may be measured in slot nn. CSI-ref n is a valid downlink slot (i.e., the terminal device has enough time to receive the measurement signal and calculate the CSI measurement result before the target CSI reference signal). CSI-ref The value of n can be related to at least one of K and m. When at least one of K and m is different, n CSI-ref The values ​​of are different. Several solutions are possible:

[0195] Solution 1:n CSI-ref The value of is related to K only.

[0196] In this case, n CSI-ref The value of

number

[0197] moreover,

number

number

[0198] In solution 1, n CSI-ref It can be seen that the value of is determined to be directly proportional to the number K of CSI-RS measurement instants within a CSI-RS burst. Specifically, the time-domain position of the target CSI reference resource increasingly precedes the time-domain position of the CSI report as K increases, and the time for calculating CSI measurement results by the terminal device increases as K increases. This avoids cases where the time for calculating CSI measurement results by the terminal device is insufficient or redundant due to an increase or decrease in the number of received CSI-RSs. In this way, the resources of the terminal device are used effectively, and the communication performance of the terminal device is guaranteed.

[0199] Solution 2:n CSI-ref The value of is related to m only.

[0200] In this case, n CSI-ref The value of

number

[0201] moreover,

number

number

[0202] In solution 2, n CSI-ref It can be seen that the value of is determined to be inversely proportional to the gap m between CSI-RS measurement instants within a CSI-RS burst. Specifically, as m decreases, the time-domain position of the target CSI reference resource increasingly precedes the time-domain position of the CSI report. As a result, as the gap between CSI-RS measurement instants decreases, the terminal device increases the reserved time for calculating CSI measurement results. Therefore, on the premise that it is not possible to complete the calculation of a single CSI feedback amount between two adjacent CSI-RSs due to a small time gap, the calculation can be further completed within the reserved time for calculating CSI measurement results. In this way, the terminal device's resources are used effectively, and the terminal device's communication performance is guaranteed.

[0203] Solution 3:n CSI-ref The value of is related to m and K.

[0204] This solution can include the following two cases:

[0205] Case 1:n CSI-ref The value of

number

number

[0206] Furthermore, for how to obtain the values ​​of f2(K) and f3(K), please refer to the method for obtaining the value of f1(K) in Solution 1.

[0207] In the solution corresponding to Case 1 of Solution 3, n CSI-refIt can be seen that the value of is determined to be directly proportional to the number K of CSI-RS measurement time points within a CSI-RS burst, and a specific related method is determined based on the gap m between measurement time points. In other words, the time-domain position of the target CSI reference resource increasingly precedes the time-domain position of the CSI report as K increases, and increasingly precedes the time-domain position of the CSI report when the gap between measurement time points is less than a predetermined gap m1. In this way, the time reserved by the terminal device for calculating CSI measurement results increases as the number of measurement time points increases. This avoids cases where the terminal device has insufficient or redundant time to calculate CSI measurement results due to an increase or decrease in the number of received CSI-RSs. In addition, the increase amplitude of the reserved time for calculating CSI measurement results can be increased to take into account cases where the gap between measurement time points decreases, so that the terminal device has sufficient calculation time for NZP CSI-RSs received with small gaps. In this way, the terminal device's resources are effectively used in two aspects, and the communication performance of the terminal device is better guaranteed.

[0208] Case 2:n CSI-ref The value of

number

[0209] In the solution corresponding to Case 2 of Solution 3, n CSI-refIt can be seen that the value of is inversely proportional to m and directly proportional to K. In other words, the time-domain position of the target CSI reference resource precedes the time-domain position of the CSI report by a number of times as K increases, and precedes the time-domain position of the CSI report by a number of times as m decreases. In other words, the time reserved by the terminal device for calculating CSI measurement results increases as the number of measurement time points increases and increases as the gap m between measurement time points decreases, and the terminal device ultimately determines the time to calculate the CSI measurement results based on the two factors. Thus, the terminal device can have appropriate time to calculate CSI measurement results for CSI-RS bursts including different numbers of measurement time points, and can also have sufficient calculation time for NZP CSI-RS with small gaps. In this way, the terminal device's resources are effectively used in two ways, and the communication performance of the terminal device is better guaranteed.

[0210] Solution 4:n CSI-ref The value of is related to at least one of m and K. For different values ​​of at least one of m and K, CSI-ref The values ​​of are distinct and both are constants. A constant value satisfies at least one of the following requirements:

[0211] (1) The larger the value of K, the CSI-ref Indicates that the value of is large.

[0212] (2) The larger the value of m, the CSI-ref indicates that the value of is small.

[0213] (3) The values ​​of K are divided into h sets, and set K i All values ​​of K in the set K i+1 The larger the value of K in the different sets, the smaller the value of n CSI-ref indicates that the value of is large. All values ​​of K in the same set are CSI-ref The number of values ​​of K in the set is 1 or greater, and h is 2 or greater.

[0214] For (3), please refer to Figure 3C. Figure 3C is a diagram of partitioned sets of K values ​​according to one embodiment of the present application. As shown in Figure 3C, all values ​​of K are divided into h sets, and each set can contain one or more values ​​of K, and multiple sets are obtained by the partition. For two adjacent sets, all values ​​of K in one set are greater than or less than all values ​​of K in the other set. For example, the values ​​of K included in set K1 are greater than or less than K. 11 From K 1g1 Similarly, the values ​​of K in the set K2 are 21 From K 2g2 The maximum value K in the set K1 1g1 is the smallest value K in the set K2 21 This means that all values ​​of K in set K1 are smaller than all values ​​of K in set K2. Furthermore, the same set is CSI-ref corresponds to the same value of n, i.e., all values ​​of K in the set K1 correspond to the same n CSI-ref1 corresponds to the same n CSI-ref2 Also, since the value of K in set K2 is greater than the value of K in set K1, the n CSI-ref2 is the n corresponding to the set K1 CSI-ref1 is greater than.

[0215] (4) The values ​​of m are divided into q sets, and set m j All values ​​of m in the set m j+1 The larger the value of m in the different sets, the smaller the value of m in the different sets. CSI-ref indicates that the value of m is small. All values ​​of m in the same set are CSI-ref The number of values ​​of m in the set is 1 or greater, and q is 2 or greater.

[0216] For details, please refer to Figure 3D. Figure 3D is a diagram of partitioned sets of m values ​​according to one embodiment of the present application. As shown in Figure 3D, all values ​​of m are divided into q sets, and each set can contain one or more values ​​of m, and multiple sets are obtained by the division. For two adjacent sets, all values ​​of m in one set are greater than or less than all values ​​of m in the other set. For example, the values ​​of m included in set m1 are greater than or less than m 11 From m 1t1 Similarly, the value of m in the set m2 is m 21 From m 2t2 The maximum value m in the set m1 1t1 is the smallest value m in the set m2 21 This means that all values ​​of m in set m1 are less than all values ​​of m in set m2. Furthermore, the same set is CSI-ref corresponds to the same value of n, i.e., all values ​​of m in the set m1 correspond to the same n CSI-ref1 corresponds to the same n CSI-ref2 In addition, the value of m in set m2 is greater than the value of m in set m1, so n corresponding to set m2 CSI-ref2 is the n corresponding to the set m1 CSI-ref1 is smaller than.

[0217] In an embodiment of Solution 4, n CSI-ref The value of is positively correlated with the value of K, i.e., increases as the value of K increases, or increases stepwise as the value of K increases. This also ensures that the terminal device has adequate time to calculate the CSI measurement results during an increase or decrease in the number of NZP CSI-RSs in a CSI-RS burst. In this way, resource waste or insufficient calculation time is avoided, and the communication performance of the terminal device is guaranteed. However, n CSI-refSince the value of is inversely correlated with the value of m, i.e., increases as the value of m decreases or increases stepwise as the value of m decreases, the terminal device can also have enough time to calculate the CSI measurement results of the NZP CSI-RS with small gaps, thereby effectively using the resources of the terminal device and improving the communication performance of the terminal device.

[0218] The above process is performed when the target CSI reference resource is nn CSI-ref and n CSI-ref relates to at least one of K and m.

[0219] In some other cases, the target CSI reference resource is nn CSI-ref and n CSI-ref teeth

number

number

[0220] nn CSI-ref is a valid downlink slot (i.e., the terminal device can receive the measurement signal before the target CSI reference signal and have enough time to calculate the CSI measurement result), CSI-ref but

number

[0221] Solution 1: The value of Z' is related to K only.

[0222] In this case, the value of Z', f1'(K), is related only to K, e.g., f1'(K)=n3K+p3, f1'(K)=r3K 2 +p3, etc., where r3 and p3 are constants, r3>0, and p3≧0.

[0223] moreover,

number

number

[0224] Solution 2: The value of Z' is related to m only.

[0225] In this case, the value of Z', f2'(m), may be inversely proportional to the value of m. Specifically, for example, f2'(m)=(r4-m)s5+p4, f2'(m)=(r4-m) 2 s5+p4, etc., where the values ​​of r4, s5, and p4 are constants, and r4>0, p4≧0, and s5>0.

[0226] moreover,

number

number

[0227] Solution 3: The value of Z' is related to m and K.

[0228] This solution may further include two cases: Case 1: The value of Z' is f4'(m,K), where

number

number

[0229] moreover,

number

[0230] Case 2: The value of Z', f3'(m,K), is inversely proportional to the value of m and directly proportional to the value of K. For example, f3'(m,K)=f1'(K)*f2'(m), where:

number

[0231] Solution 4: The value of Z' is related to at least one of m and K. For at least one different value of m and K, the values ​​of Z' are different and are all constants f5'(m,K). The constant values ​​satisfy at least one of the following requirements:

[0232] (1) The larger the value of K, the larger the value of Z'.

[0233] (2) The larger the value of m, the smaller the value of Z'.

[0234] (3) The values ​​of K are divided into h sets, and set K i All values ​​of K in the set K i+1 h is greater than or less than the value of K in the set, i∈(1,h-1). Larger values ​​of K in different sets indicate larger values ​​of Z'. All values ​​of K in the same set correspond to the same value of Z'. The number of values ​​of K in the set is 1 or greater, and h is 2 or greater.

[0235] (4) The values ​​of m are divided into q sets, and set m j All values ​​of m in the set m j+1 j∈(1,q-1) is greater than or less than the value of m in Z'. Larger values ​​of m in different sets indicate smaller values ​​of Z'. All values ​​of m in the same set correspond to the same value of Z'. The number of values ​​of m in the set is 1 or greater, and q is 2 or greater.

[0236] If the value of Z' is a constant, see n for specific details on how to relate the value of Z' to K and / or m. CSI-ref See the above discussion on how to associate the value of with K and / or m; details will not be repeated here.

[0237] If the value of Z' is related to K or m separately and related to both K and m, the corresponding technical effect that can be achieved is CSI-ref See the above discussion regarding the value of , and we will not repeat the details here.

[0238] Also, n CSI-refThe case where the value of is related to at least one of K and m and the case where the value of Z' is related to K or m may coexist or may exist independently. For example, when CSI reporting is performed periodically or semi-persistently, the terminal device may CSI-ref Based on the correlation between the value of and at least one of K and m, CSI-ref Determine the value of the target CSI reference resource nn CSI-ref When performing CSI reporting aperiodically, the terminal device may determine the time domain position of n based on the correlation between the value of Z′ and at least one of K and m. CSI-ref Determine the value of the target CSI reference resource nn CSI-ref The time domain position of can be determined.

[0239] n CSI-ref The manner in which the terminal device determines that the value of (or Z') is associated with at least one of K and m may be specified in a protocol between the terminal device and the network device. CSI-ref It is specified that the value of (or Z') is specifically associated with K, or associated with m, or associated with both K and m. The specific association method may be specified in the protocol.

[0240] In a possible implementation, the protocol may include: CSI-ref (or Z') is related to at least one of K and m, and the terminal device determines n based on the protocol specification and at least one of K and m indicated by the network device. CSI-ref (or Z') value can be determined directly. For example, if Z'=n3K+p3 is defined in the protocol and the terminal device indicates K=5, the terminal device can determine the value of Z'.

[0241] In another possible implementation, multiple groups of correspondences are defined in the protocol, and each group of correspondences has n CSI-ref(or Z') and at least one of K and m. Alternatively, the terminal device may determine n based on the protocol specification and at least one of K and m indicated by the network device. CSI-ref (or Z') may be determined directly, e.g.

number

[0242] Or, n CSI-ref The value of (or Z') is related to at least one of K and m, and all possible related methods may be specified in the protocol between the terminal device and the network device. However, a specific related method to be performed by the terminal device is indicated by the network device using third information. The third information may be transmitted before the first information, after the first information, or together with the first information. This is not specifically limited in this embodiment of the present application. The terminal device determines n by referring to at least one of K and m indicated by the network device based on the received third information. CSI-ref (or Z') can be determined.

[0243] For example, in the protocol, the related method between the value of Z' and K and m is (1) Z' = n3K + p3, (2) Z' = (r4 - m)s5 + p4, and (3)Z'=f1'(K)*f2'(m).

[0244] The network device sends third information indicating that in the current communication process, the association between the value of Z' and K and m is (3). In this case, the terminal device can determine the value of Z' based on the received third information and with reference to K and m indicated by the network device.

[0245] In the former method, the terminal device may calculate the target CSI reference resource by using n CSI-ref (or Z') can be quickly determined in a way that relates the value of K and / or m. In the latter way, n CSI-ref Improved flexibility in the way the value of (or Z') is related to K and / or m can be achieved to improve flexibility in communications between terminal devices and network devices.

[0246] 303: The terminal device reports CSI at a time-domain position of the CSI report based on the measurement signal. Correspondingly, the network device receives the reported CSI.

[0247] The terminal device may receive a measurement signal before the target CSI reference resource, perform channel measurement based on the received NZP CSI-RS, and perform interference measurement based on the received CSI-IM signal to obtain a CSI measurement result. The CSI (measurement result) may include parameters such as RI, CQI, or PMI, among others, and the CSI is then reported to the network device. Specifically, the CSI is reported at a time-domain position of the CSI report. The time-domain position of the CSI report may be indicated to the terminal device by the network device or may be obtained by the terminal device in another manner. The network device may receive the CSI reported by the terminal device and then transmit data based on the parameters of the received CSI.

[0248] It can be seen that in this embodiment of the present application, the network device transmits first information to the terminal device to indicate K measurement time points for transmitting the NZP CSI-RS and m measurement gaps between adjacent measurement time points at the K measurement time points. In this manner, the terminal device determines a target CSI reference resource based on at least one of K and m, receives a measurement signal before the target CSI reference resource, obtains CSI (measurement results) by calculation based on the received measurement signal, and reports the CSI. In this manner, it is possible to ensure that the terminal device has flexible time to complete CSI operations during channel measurement. In this manner, resource waste caused by excessively long operation times is avoided, and the problem of being unable to support high-speed CSI operations due to excessively short operation times is avoided. As a result, the resources of the terminal device are used effectively, and the communication performance of the terminal device is guaranteed.

[0249] Furthermore, aperiodic CSI reporting may be triggered by transmitting a DCI by a network device. Assume that the gap between the time-domain position of the PDCCH carrying the DCI and the time-domain position of the PUSCH carrying the corresponding CSI report is equal to or greater than Z. See the diagram of Z in Figure 3B. Furthermore, assuming that Z is measured in symbols, a specific meaning of Z may be the symbol gap between the last symbol of the time-domain position carrying the DCI and the first symbol of time-domain position n carrying the CSI report. Assume that Z is measured in slots, a specific meaning of Z may be the slot gap between the last slot of the time-domain position carrying the DCI and the first slot of time-domain position n carrying the CSI report.

[0250] After transmitting the DCI, the network device further delivers periodic, semi-persistent, or aperiodic NZP CSI-RS bursts, and the transmission opportunities of the NZP CSI-RS bursts change by at least one of K and m. Correspondingly, the value of Z also changes accordingly.

[0251] Specifically, if we assume that Z' is measured in symbols and Z is also measured in symbols, then the value of Z is

number

[0252] Here, Δ1 is a constant greater than or equal to 0, and the specific value of Z′ may be as described above, that is, the specific value of Z is:

number

number

number

number

[0253] Assuming Z' is measured in the slot and Z is also measured in the slot, the value of Z is Z=Δ1+m(K-1)+Z'(2)

[0254] Here, Δ1 is a constant greater than or equal to 0, and the specific value of Z′ may be as described above, that is, the specific value of Z is: Z=Δ1+m(K-1)+f1'(K), or Z=Δ1+m(K-1)+f2'(m), or Z=Δ1+m(K-1)+f4'(m,K), or Z=Δ1+m(K-1)+f5'(m,K).

[0255] The network device may determine the value of Z based on the values ​​of m, K, and Z', and transmit the DCI at a time-domain position where the gap from the time-domain position of the CSI report is equal to or greater than Z, so that the terminal device can correctly receive the measurement signal after the DCI and perform CSI reporting, thereby ensuring the communication performance of the terminal device.

[0256] In some other cases, the units of Z are symbols, and the value of Z is

number

[0257] Here, Δ2 is a constant greater than or equal to 0.

[0258] That is, the value of Z is positively correlated with m and K, and increases as m and K increase.

[0259] Similarly, the network device may determine the value of Z based on the values ​​of m and K, and transmit the DCI at a time-domain position where the gap from the time-domain position of the CSI report is equal to or greater than Z, so that the terminal device can correctly receive the measurement signal after the DCI and perform CSI reporting, thereby ensuring the communication performance of the terminal device.

[0260] FIG. 4 illustrates a communication device 400 according to one embodiment of the present application. The communication device includes a module or unit configured to implement the method of the method embodiment of FIG. 3A and any possible design of the method embodiment. The module or unit may be a hardware circuit, software, or may be implemented by a hardware circuit in combination with software. The communication device may be a terminal device, or may be a device (e.g., a chip, chip system, or circuit) within a terminal device and a network device, or a device that can be used with a terminal device. The device may include a transceiver unit 401 and a processing unit 402.

[0261] When the communication device 400 is configured to perform the functions of the terminal device in the method embodiment shown in FIG. 3A, The transceiver unit 401 is configured to receive first information, where the first information indicates K measurement time points for measuring a non-zero power channel state information reference signal NZP CSI-RS and a measurement gap m between adjacent measurement time points among the K measurement time points.

[0262] The processing unit 402 is configured to determine a time-domain location of the target CSI reference resource based on the first information, where the time-domain location of the target CSI reference resource is related to the time-domain location of the CSI report and at least one of K and m.

[0263] The transceiver unit 401 is further configured to receive a measurement signal prior to the target CSI reference resource, where the measurement signal includes an NZP CSI-RS used for channel measurement.

[0264] The processing unit 402 is configured to obtain the CSI by calculation based on the measurement signals.

[0265] The transceiver unit 401 is further configured to report the CSI at a time domain position of the CSI report.

[0266] When the communication device 400 is configured to perform the functionality of the network device in the method embodiment of FIG. 3A: The processing unit 402 is configured to generate first information, where the first information indicates K transmission time points for transmitting the NZP CSI-RS and a transmission gap m between adjacent transmission time points among the K transmission time points.

[0267] The transceiver unit 401 is configured to transmit first information and is further configured to transmit a measurement signal based on the first information, where the measurement signal includes an NZP CSI-RS used for channel measurement.

[0268] The transceiver unit 401 is further configured to receive the reported CSI, where the CSI is obtained based on a measurement signal in front of the target CSI reference resource, and the time-domain position of the target CSI reference resource is related to at least one of K and m.

[0269] For a more detailed description of the transceiver unit 401 and the processing unit 402, please refer to the relevant descriptions of the above method embodiments, and the details will not be repeated here.

[0270] 5 is a diagram of a hardware structure of a communication device according to an embodiment of the present application. For the configuration of the communication device in FIG. 4, please refer to the configuration shown in FIG. 5. The communication device 900 includes a processor 111 and a transceiver 112. The processor 111 and the transceiver 112 are electrically coupled.

[0271] The processor 111 is configured to execute some or all of the computer program instructions in the memory. Execution of some or all of the computer program instructions enables the device to perform a method according to any one of the above-mentioned embodiments. For example, the processor 111 is configured to generate first information, the first information indicating K transmission time points for transmitting the NZP CSI-RS and m transmission gaps between adjacent transmission time points among the K transmission time points.

[0272] The transceiver 112 is configured to communicate, for example, with another device configured to transmit the generated first information.

[0273] Optionally, the device further includes a memory 113 configured to store computer program instructions. Optionally, memory 113 (memory #1) is located internal to the device, memory 113 (memory #2) is integrated with the processor 111, or memory 113 (memory #3) is located external to the device.

[0274] It should be understood that the communication device 900 shown in FIG. 5 may be a chip or a circuit, for example, a chip or a circuit disposed in a terminal device or a communication device. The transceiver 112 may alternatively be a communication interface. The transceiver includes a receiver and a transmitter. Furthermore, the communication device 900 may further include a bus system.

[0275] The processor 111, the memory 113, and the transceiver 112 are connected via a bus system. The processor 111 is configured to control the transceiver to receive and transmit signals and to execute instructions stored in the memory 113 to complete steps of the first device or the second device in the method of implementing the present application. The memory 113 may be integrated with the processor 111 or located separately from the processor 111.

[0276] In one embodiment, the functionality of the transceiver 112 may be implemented using transceiver circuitry or a dedicated transceiver chip. The processor 111 may be implemented by using a dedicated processing chip, processing circuitry, processor, or general-purpose chip. The processor may be a central processing unit (CPU), a network processor (NP), or a combination of a CPU and an NP. The processor may further include a hardware chip or another general-purpose processor. The hardware chip may be an application-specific integrated circuit (ASIC), a programmable logic device (PLD), or a combination thereof. The PLD may be a complex programmable logic device (CPLD), a field-programmable gate array (FPGA), a generic array logic (GAL) and other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, or any combination thereof. The general-purpose processor may be a microprocessor, and the processor may be any conventional processor, or the like.

[0277] It can be understood that the memory referred to in the embodiments of the present application may be volatile memory or nonvolatile memory, or may include volatile memory and nonvolatile memory. Nonvolatile memory may be read-only memory (ROM), programmable read-only memory (PROM), erasable programmable read-only memory (EPROM), electrically erasable programmable read-only memory (EEPROM), or flash memory. Volatile memory may be random access memory (RAM) used as an external cache. By way of example and not limitation, many forms of RAM may be used, such as static random access memory (SRAM), dynamic random access memory (DRAM), synchronous dynamic random access memory (SDRAM), double data rate synchronous dynamic random access memory (DDR SDRAM), enhanced synchronous dynamic random access memory (ESDRAM), Synchlink dynamic random access memory (SLDRAM), and direct Rambus random access memory (DR RAM). It should be noted that memory as described in this application is intended to include, but is not limited to, these and any other suitable types of memory.

[0278] An embodiment of the present application provides a computer storage medium storing a computer program, the computer program being for performing the method applied in the network device or terminal device in the aforementioned embodiment.

[0279] An embodiment of the present application provides a computer program product including instructions, which, when executed on a computer, enable the computer to perform the method applied to the network device or the terminal device in the aforementioned embodiment.

[0280] It should be understood that the sequence numbers of the above processes do not mean the execution order in the embodiments of the present application, and the execution order of the processes should be determined based on the functions and internal logic of the processes, and should not be construed as limiting the implementation process of the embodiments of the present application.

[0281] Those skilled in the art may recognize that, in combination with the examples described in the embodiments disclosed herein, the units and algorithm steps may be implemented by electronic hardware or a combination of computer software and electronic hardware. Whether a function is performed by hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art may use different methods to implement the described functions for each specific application, but such implementation should not be considered to go beyond the scope of this application.

[0282] For the sake of convenient and concise description, those skilled in the art can clearly understand that for the detailed operation processes of the above-mentioned systems, devices and units, please refer to the corresponding processes in the above-mentioned method embodiments, and the details will not be repeated here.

[0283] In some embodiments provided in the present application, it should be understood that the disclosed systems, devices, and methods may be implemented in other ways. For example, the described device embodiments are merely examples. For example, the division into units is merely a logical division of function, and actual implementation may involve other divisions. For example, multiple units or components may be combined or integrated into another system, or some features may be omitted or not implemented. In addition, the shown or described mutual couplings or direct couplings or communication connections may be implemented via some interfaces. Indirect couplings or communication connections between devices or units may be implemented in electronic, mechanical, or other forms.

[0284] The modules described as separate parts may or may not be physically separate, and the parts shown as modules may or may not be physical modules, and may be located in one location or distributed across multiple network modules. Some or all of the modules may be selected according to actual needs to achieve the objectives of the solutions of the embodiments.

[0285] In addition, the functional modules in this application may be integrated into one processing module, or each of the modules may exist physically alone, or two or more modules may be integrated into one module.

[0286] When functions are realized in the form of software functional modules and sold or used as an independent product, the functions may be stored in a computer-readable storage medium. Based on this understanding, the technical solutions of the present application may essentially be implemented, or a portion of the technical solutions may be implemented in the form of a software product. The computer software product includes instructions stored in a storage medium that instruct a computer device (which may be a personal computer, a server, a network device, etc.) to perform all or part of the steps of the methods described in the embodiments of the present application. The aforementioned storage medium includes any medium capable of storing program code, such as a USB flash drive, a removable hard disk, a ROM, a RAM, a magnetic disk, or an optical disk.

[0287] The above description is merely a specific embodiment of the present application and is not intended to limit the scope of protection of the present application. Any variations or replacements that can be easily conceived by those skilled in the art within the technical scope disclosed in the present application shall fall within the scope of protection of the present application. Therefore, the scope of protection of the present application shall be subject to the scope of protection of the claims. [Explanation of symbols]

[0288] 101 Network Devices 102~107 Terminal Devices 111 processors 112 Transceiver 113 memory 201~203 Network Devices 204, 205 Terminal devices 400 Communication Equipment 401 Transceiver Unit 402 Processing Unit 900 Communication Equipment

Claims

1. 1. A channel measurement method, comprising: receiving first information from a network device, the first information indicating K measurement instances for measuring non-zero power channel state information reference signals (NZP CSI-RS) and a measurement gap m between adjacent measurement instances among the K measurement instances; receiving downlink control information DCI from the network device, the DCI being used to trigger CSI reporting; performing the CSI report if a gap between a time domain position of the DCI and a time domain position of the CSI report is equal to or greater than Z, [Equation 1] and Δ 2 is a constant greater than or equal to 0.

2. 2. The method of claim 1, wherein Z is a symbol gap between the last symbol of the time domain location carrying the DCI and the first symbol of the time domain location carrying the CSI report.

3. The method of claim 1 or 2, wherein radio resource control (RRC) signaling indicates receiving the first information.

4. 4. The method of claim 1, wherein the NZP CSI-RS is aperiodic, the K measurement instances correspond to K NZP CSI-RS resources included in an NZP CSI-RS resource set, and the measurement gap corresponds to a time offset difference between adjacent resources among the K NZP CSI-RS resources; or the NZP CSI-RS is periodic or semi-persistent, the K measurement instances correspond to K measurement instances of a same NZP CSI-RS resource, and the measurement gap corresponds to a periodicity for transmitting the NZP CSI-RS.

5. 1. A channel measurement method, comprising: transmitting first information, the first information indicating K transmission time points for transmitting non-zero power channel state information reference signals (NZP) CSI-RS and transmission gaps m between adjacent transmission time points among the K transmission time points; transmitting downlink control information (DCI), wherein the DCI is used to trigger a CSI report, and a gap between a time-domain position of the DCI and a time-domain position of the CSI report is equal to or greater than Z; The value of Z is [Equation 2] and Δ 2 A channel measurement method where is a constant greater than or equal to 0.

6. 6. The method of claim 5, wherein Z is a symbol gap between the last symbol of the time domain location carrying the DCI and the first symbol of the time domain location carrying the CSI report.

7. The method of claim 5 or 6, wherein the first information is transmitted using radio resource control (RRC) signaling.

8. 8. The method of claim 5, wherein the NZP CSI-RS is aperiodic, the K transmission instances correspond to K NZP CSI-RS resources included in an NZP CSI-RS resource set, and the transmission gap corresponds to a time offset difference between adjacent resources among the K NZP CSI-RS resources; or the NZP CSI-RS is periodic or semi-persistent, the K transmission instances correspond to K transmission instances of a same NZP CSI-RS resource, and the transmission gap corresponds to a periodicity for transmitting the NZP CSI-RS.

9. A communication device, a transceiver unit configured to receive first information from a network device, the first information indicating K measurement time points for measuring a non-zero power channel state information reference signal (NZP CSI-RS) and a measurement gap m between adjacent measurement time points among the K measurement time points; a transceiver unit further configured to receive downlink control information (DCI) from the network device, the DCI being used to trigger a CSI report; a processing unit configured to determine the CSI based on the DCI; the transceiver unit is further configured to perform the CSI reporting when a gap between a time-domain position of the DCI and a time-domain position of the CSI report is equal to or greater than Z, and the value of Z is [Equation 3] and Δ 2 is a constant greater than or equal to 0, the communication device.

10. 10. The apparatus of claim 9, wherein Z is a symbol gap between a last symbol of the time domain location carrying the DCI and a first symbol of the time domain location carrying the CSI report.

11. 11. The apparatus of claim 9 or 10, wherein the transceiver unit is further configured to receive the first information using radio resource control (RRC) signaling.

12. 12. The apparatus of claim 9, wherein the NZP CSI-RS is aperiodic, the K transmission instances correspond to K NZP CSI-RS resources included in an NZP CSI-RS resource set, and the transmission gap corresponds to a time offset difference between adjacent resources among the K NZP CSI-RS resources; or wherein the NZP CSI-RS is periodic or semi-persistent, the K transmission instances correspond to K transmission instances of a same NZP CSI-RS resource, and the transmission gap corresponds to a periodicity for transmitting the NZP CSI-RS.

13. A communication device, a processing unit configured to determine first information, the first information indicating K transmission time points for transmitting a non-zero power channel state information reference signal (NZP) CSI-RS and a transmission gap m between adjacent transmission time points among the K transmission time points; a processing unit, the processing unit being further configured to determine downlink control information (DCI), the DCI being used to trigger CSI reporting; a transceiver unit configured to transmit the first information; the transmitting unit is further configured to transmit the DCI, wherein a gap between a time-domain position of the DCI and a time-domain position of the CSI report is equal to or greater than Z; The value of Z is [Equation 4] and Δ 2 is a constant greater than or equal to 0, the communication device.

14. 14. The apparatus of claim 13, wherein Z is a symbol gap between a last symbol of the time domain location carrying the DCI and a first symbol of the time domain location carrying the CSI report.

15. 15. The apparatus of claim 13 or 14, wherein the transceiver unit is further configured to transmit the first information using radio resource control (RRC) signaling.

16. 16. The apparatus of claim 13, wherein the NZP CSI-RS is aperiodic, the K transmission instances correspond to K NZP CSI-RS resources included in an NZP CSI-RS resource set, and the transmission gap corresponds to a time offset difference between adjacent resources among the K NZP CSI-RS resources; or wherein the NZP CSI-RS is periodic or semi-persistent, the K transmission instances correspond to K transmission instances of a same NZP CSI-RS resource, and the transmission gap corresponds to a periodicity for transmitting the NZP CSI-RS.

17. 1. A channel measurement method, comprising: receiving first information, the first information indicating K measurement instances for measuring non-zero power channel state information reference signals (NZP CSI-RS) and a measurement gap m between adjacent measurement instances among the K measurement instances; receiving a measurement signal before a target CSI reference resource based on the first information, the measurement signal including the NZP CSI-RS used for channel measurement, and a time-domain position of the target CSI reference resource associated with at least one of K and m; and reporting CSI at a time-domain position of CSI reporting based on the measurement signal.

18. 18. The method of claim 17, before receiving the measurement signal before the target CSI reference resource based on the first information, the method further comprising receiving second information, the second information indicating the time-domain position of the CSI report.

19. the NZP CSI-RS is aperiodic, the K measurement instants correspond to K NZP CSI-RS resources included in an NZP CSI-RS resource set, and the measurement gap corresponds to a time offset difference between adjacent NZP CSI-RS resources among the K NZP CSI-RS resources; or 19. The method of claim 17 or 18, wherein the NZP CSI-RS is periodic or semi-persistent, the K measurement instances correspond to K measurement instances of the same NZP CSI-RS resource, and the measurement gap corresponds to a periodicity for measuring the NZP CSI-RS.

20. The time domain position of the target CSI reference resource is n-n CSI－ref wherein n is a parameter related to the time-domain location of the CSI report, and the time-domain location of the target CSI reference resource is related to at least one of K and m. n CSI－ref the value of is related to at least one of K and m, or n CSI－ref but [Equation 5] the value of Z' is related to at least one of K and m; [Equation 6] 20. The method of claim 17, wherein at least one of: ∑ i = 1 ⁢ ...

21. n CSI－ref The value of is related to at least one of K and m by n CSI－ref The value of [Equation 7] is the smallest integer greater than or equal to f 1 (K) is a function directly proportional to the value of K, The value of Z' is related to at least one of K and m if the value of Z' f 1 '(K) is directly proportional to the value of K, 21. The method of claim 20.

22. n CSI－ref The value of is related to at least one of K and m by n CSI－ref The value of [Equation 8] is the smallest integer greater than or equal to f 2 (m) is a function inversely proportional to the value of m, The value of Z' is related to at least one of K and m if the value of Z' f 2 '(m) is inversely proportional to the value of m, 21. The method of claim 20.

23. n CSI－ref The value of is related to at least one of K and m by n CSI－ref The value of [Equation 9] the smallest integer greater than or equal to [Equation 10] and m 1 is the given measurement gap, and f 2 (K) and f 3 (K) is a function directly proportional to the value of K, and f 3 (K) > f 2 (K) is satisfied, The value of Z' is related to at least one of K and m if the value of Z' is f 4 '(m, K), [0011] and m 2 is the given measurement gap, and f 2 '(K) and f 3 '(K) is a function directly proportional to the value of K, and f 3 '(K)>f 2 '(K) satisfies, 21. The method of claim 20.

24. Before receiving the measurement signal on the target CSI reference resource based on the first information, the method further comprises:

24. The method of claim 17, further comprising receiving downlink control information DCI from a network device, wherein a gap between a time-domain position of the DCI and the time-domain position of the CSI report is equal to or greater than target time-domain resource Z, and the DCI is used to trigger the CSI report.

25. The value of Z is [0012] and Δ 1 25. The method of claim 24, wherein is a constant greater than or equal to 0.

26. The value of Z is [0013] and Δ 2 25. The method of claim 24, wherein is a constant greater than or equal to 0.

27. 26. The method of claim 17, wherein the first information is transmitted using CSI reporting configuration information.

28. 1. A channel measurement method, comprising: transmitting first information, the first information indicating K transmission time points for transmitting non-zero power channel state information reference signals (NZP) CSI-RS and transmission gaps m between adjacent transmission time points among the K transmission time points; transmitting a measurement signal based on the first information, the measurement signal including the NZP CSI-RS used for channel measurement; receiving reported CSI, the CSI being obtained based on the measurement signal before a target CSI reference resource, and a time-domain position of the target CSI reference resource being associated with at least one of K and m.

29. 30. The method of claim 28, wherein transmitting the measurement signal based on the first information comprises transmitting the measurement signal before the target CSI reference resource based on the first information.

30. 30. The method of claim 28 or 29, before transmitting the measurement signal based on the first information, the method further comprising transmitting second information, the second information indicating a time-domain position of the CSI report.

31. the NZP CSI-RS is aperiodic, the K transmission instants correspond to K NZP CSI-RS resources included in an NZP CSI-RS resource set, and the transmission gap corresponds to a time offset difference between adjacent NZP CSI-RS resources within the K NZP CSI-RS resources; or 31. The method of claim 28, wherein the NZP CSI-RS is periodic or semi-persistent, the K transmission instances correspond to K transmission instances of a same NZP CSI-RS resource, and the transmission gap corresponds to a periodicity for transmitting the NZP CSI-RS.

32. The time domain position of the target CSI reference resource is n-n CSI－ref wherein n is a parameter related to the time-domain location of the CSI report, and the time-domain location of the target CSI reference resource is related to at least one of K and m. n CSI－ref the value of is related to at least one of K and m, CSI－ref but [0014] the value of Z' is related to at least one of K and m; and [Equation 15] 32. The method of claim 28, wherein the number of symbols in one slot is 1.

33. n CSI－ref The value of is related to at least one of K and m by n CSI－ref The value of [0016] is the smallest integer greater than or equal to f 1 (K) is a function directly proportional to the value of K, The value of Z' is related to at least one of K and m if the value of Z' f 1 '(K) is directly proportional to the value of K, 33. The method of claim 32.

34. n CSI－ref The value of is related to at least one of K and m by n CSI－ref The value of [Equation 17] is the smallest integer greater than or equal to f 2 (m) is a function inversely proportional to the value of m, The value of Z' is related to at least one of K and m if the value of Z' f 2 '(m) is inversely proportional to the value of m, 33. The method of claim 32.

35. n CSI－ref The value of is related to at least one of K and m by n CSI－ref The value of [Equation 18] the smallest integer greater than or equal to [Equation 19] and m 1 is the predetermined transmission gap, and f 2 (K) and f 3 (K) is a function directly proportional to the value of K, and f 3 (K) > f 2 (K) is satisfied, The value of Z' is related to at least one of K and m if the value of Z' is f 4 '(m, K), [Equation 20] and m 2 is the predetermined transmission gap, and f 2 '(K) and f 3 '(K) is a function directly proportional to the value of K, and f 3 '(K)>f 2 '(K) satisfies, 33. The method of claim 32.

36. Before transmitting the measurement signal based on the first information, the method further comprises:

36. The method of claim 28, further comprising: transmitting downlink control information (DCI), wherein a gap between a time-domain position of the DCI and the time-domain position of the CSI report is equal to or greater than target time-domain resource Z, and the DCI is used to trigger the CSI report.

37. The value of Z is [Equation 21] and Δ 1 37. The method of claim 36, wherein is a constant greater than or equal to 0.

38. The value of Z is [Equation 22] and Δ 2 36. The method of claim 35, wherein is a constant greater than or equal to 0.

39. 39. The method of claim 28, wherein the first information is transmitted using CSI reporting configuration information.

40. 1. A channel measurement method, comprising: a network device transmitting first information, the first information indicating K transmission time points for transmitting non-zero power channel state information reference signals (NZP CSI-RS) and transmission gaps m between adjacent transmission time points among the K transmission time points; transmitting, by the network device, measurement information based on the first information, wherein the measurement signal includes the NZP CSI-RS used for channel measurement; receiving, by a terminal device, the first information and receiving the measurement signal before a target CSI reference resource based on the first information, wherein a time-domain position of the target CSI reference resource is associated with at least one of K and m; reporting, by the terminal device, CSI at a time-domain position of a CSI report based on the measurement signal; receiving, by the network device, the reported CSI.

41. A communication device, a transceiver unit configured to receive first information, the first information indicating K measurement instants for measuring non-zero power channel state information reference signals (NZP CSI-RS) and measurement gaps m between adjacent measurement instants among the K measurement instants; a processing unit configured to determine a time-domain location of a target CSI reference resource based on the first information, wherein the time-domain location of the target CSI reference resource is associated with at least one of K and m; the transceiver unit is further configured to receive a measurement signal before the target CSI reference resource, the measurement signal including the NZP CSI-RS used for channel measurement; the processing unit is further configured to obtain a CSI based on the measurement signal; The communications apparatus, wherein the transceiver unit is further configured to report the CSI at a time-domain position of a CSI report.

42. 42. The apparatus of claim 41, wherein the transceiver unit is further configured to receive second information, the second information indicating the time-domain location of the CSI report.

43. the NZP CSI-RS is aperiodic, the K measurement instants correspond to K NZP CSI-RS resources included in an NZP CSI-RS resource set, and the measurement gap corresponds to a time offset difference between adjacent NZP CSI-RS resources among the K NZP CSI-RS resources; or 43. The apparatus of claim 41 or 42, wherein the NZP CSI-RS is periodic or semi-persistent, the K measurement instances corresponding to the K measurement instances of the same NZP CSI-RS resource, and the measurement gap corresponds to the periodicity for measuring the NZP CSI-RS.

44. The time domain position of the target CSI reference resource is n-n CSI－ref wherein n is a parameter related to the time-domain location of the CSI report, and the time-domain location of the target CSI reference resource is related to at least one of K and m. n CSI－ref the value of is related to at least one of K and m, or n CSI－ref but [Equation 23] the value of Z' is related to at least one of K and m; [0000] 44. The apparatus of claim 41, wherein at least one of: is the number of symbols in one slot.

45. n CSI－ref The value of is related to at least one of K and m by n CSI－ref The value of [Equation 25] is the smallest integer greater than or equal to f 1 (K) is a function directly proportional to the value of K, The value of Z' is related to at least one of K and m if the value of Z' f 1 '(K) is directly proportional to the value of K, 45. The apparatus of claim 44.

46. n CSI－ref The value of is related to at least one of K and m by n CSI－ref The value of [Equation 26] is the smallest integer greater than or equal to f 2 (m) is a function inversely proportional to the value of m, The value of Z' is related to at least one of K and m if the value of Z' f 2 '(m) is inversely proportional to the value of m, 45. The apparatus of claim 44.

47. n CSI－ref The value of is related to at least one of K and m by n CSI－ref The value of [0000] the smallest integer greater than or equal to [0000] and m 1 is the given measurement gap, and f 2 (K) and f 3 (K) is a function directly proportional to the value of K, and f 3 (K) > f 2 (K) is satisfied, The value of Z' is related to at least one of K and m if the value of Z' is f 4 '(m, K), [0000] and m 2 is the given measurement gap, and f 2 '(K) and f 3 '(K) is a function directly proportional to the value of K, and f 3 '(K)>f 2 '(K) satisfies, 45. The apparatus of claim 44.

48. before receiving the measurement signal in the target CSI reference resource based on the first information, 48. The apparatus of claim 43, further configured to receive downlink control information DCI from a network device, wherein a gap between a time-domain position of the DCI and the time-domain position of the CSI report is equal to or greater than a target time-domain resource Z, and the DCI is used to trigger the CSI report.

49. The value of Z is [Equation 30] and Δ 1 49. The apparatus of claim 48, wherein is a constant greater than or equal to 0.

50. The value of Z is [Equation 31] and Δ 2 49. The apparatus of claim 48, wherein is a constant greater than or equal to 0.

51. 51. The apparatus of claim 43, wherein the first information is transmitted using CSI reporting configuration information.

52. A communication device, a processing unit configured to generate first information, the first information indicating K transmission time points for transmitting a non-zero power channel state information reference signal (NZP) CSI-RS and a transmission gap m between adjacent transmission time points among the K transmission time points; a transceiver unit configured to transmit the first information and to transmit a measurement signal based on the first information, the measurement signal including the NZP CSI-RS used for channel measurement; 4. The communications apparatus, wherein the transceiver unit is further configured to receive reported CSI, the CSI being obtained based on the measurement signal before a target CSI reference resource, and a time-domain position of the target CSI reference resource being associated with at least one of K and m.

53. 53. The apparatus of claim 52, wherein transmitting the measurement signal based on the first information comprises transmitting the measurement signal before the target CSI reference resource based on the first information.

54. 54. The apparatus of claim 52 or 53, wherein the transceiver unit is further configured to transmit second information before transmitting the measurement signal based on the first information, the second information indicating a time-domain position of a CSI report.

55. the NZP CSI-RS is aperiodic, the K transmission instants correspond to K NZP CSI-RS resources included in an NZP CSI-RS resource set, and the transmission gap corresponds to a time offset difference between adjacent NZP CSI-RS resources within the K NZP CSI-RS resources; or 55. The apparatus of claim 52, wherein the NZP CSI-RS is periodic or semi-persistent, the K transmission instances correspond to K transmission instances of a same NZP CSI-RS resource, and the transmission gap corresponds to a periodicity for transmitting the NZP CSI-RS.

56. The time domain position of the target CSI reference resource is n-n CSI－ref wherein n is a parameter related to the time-domain location of the CSI report, and the time-domain location of the target CSI reference resource is related to at least one of K and m. n CSI－ref the value of is related to at least one of K and m, or n CSI－ref but [Equation 32] the value of Z' is related to at least one of K and m; [Equation 33] 56. The apparatus of claim 52, wherein at least one of: is the number of symbols in one slot.

57. n CSI－ref The value of is related to at least one of K and m by n CSI－ref The value of [Equation 34] is the smallest integer greater than or equal to f 1 (K) is a function directly proportional to the value of K, The value of Z' is related to at least one of K and m if the value of Z' f 1 '(K) is directly proportional to the value of K, 57. The apparatus of claim 56.

58. n CSI－ref The value of is related to at least one of K and m by n CSI－ref The value of [Equation 35] is the smallest integer greater than or equal to f 2 (m) is a function inversely proportional to the value of m, The value of Z' is related to at least one of K and m if the value of Z' f 2 '(m) is inversely proportional to the value of m, 57. The apparatus of claim 56.

59. n CSI－ref The value of is related to at least one of K and m by n CSI－ref The value of [Equation 36] the smallest integer greater than or equal to [Equation 37] and m 1 is the predetermined transmission gap, and f 2 (K) and f 3 (K) is a function directly proportional to the value of K, and f 3 (K) > f 2 (K) is satisfied, The value of Z' is related to at least one of K and m if the value of Z' is f 4 '(m, K), [Equation 38] and m 2 is the predetermined transmission gap, and f 2 '(K) and f 3 '(K) is a function directly proportional to the value of K, and f 3 '(K)>f 2 '(K) satisfies, 57. The apparatus of claim 56.

60. Before transmitting the measurement signal based on the first information, the transceiver unit:

60. The apparatus of claim 52, further configured to: transmit downlink control information (DCI), wherein a gap between a time-domain position of the DCI and the time-domain position of the CSI report is equal to or greater than target time-domain resource Z, and the DCI is used to trigger the CSI report.

61. The value of Z is [Number 39] and Δ 1 61. The apparatus of claim 60, wherein is a constant greater than or equal to 0.

62. The value of Z is [Equation 40] and Δ 2 61. The apparatus of claim 60, wherein is a constant greater than or equal to 0.

63. 63. The apparatus of claim 52, wherein the first information is transmitted using CSI reporting configuration information.

64. 10. A computer readable storage medium comprising instructions that, when executed on a communications device, cause the method of any one of claims 1 to 8 to be performed, or the method of any one of claims 17 to 40 to be performed.

65. A communication system comprising: a terminal device configured to perform the method of any one of claims 1 to 8; and a network device configured to perform the method of any one of claims 17 to 40.

66. A communications device comprising a processor and a communications interface, wherein the communications interface is configured to communicate and the processor is configured to execute computer instructions, such that a method according to any one of claims 1 to 8 is performed, or a method according to any one of claims 17 to 40 is performed.

67. 67. The device of claim 66, wherein the device is a chip.

68. A communications device comprising a memory and a processor, wherein the memory is configured to store computer instructions and the processor is configured to execute the computer instructions, such that a method according to any one of claims 1 to 8 is performed, or a method according to any one of claims 17 to 40 is performed.

69. 69. The device of claim 68, wherein the device is a chip.

70. A communications chip storing instructions that, when executed on a communications device, perform the method of any one of claims 1 to 8 or perform the method of any one of claims 17 to 40.

71. A computer program product comprising computer instructions, some or all of which, when executed on a computer, perform the method of any one of claims 1 to 8 or perform the method of any one of claims 17 to 40.

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