CN113271158A

CN113271158A - Method and device for measuring channel state information

Info

Publication number: CN113271158A
Application number: CN202010093026.0A
Authority: CN
Inventors: 李胜钰; 官磊; 李锐杰
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2020-02-14
Filing date: 2020-02-14
Publication date: 2021-08-17
Also published as: WO2021160137A1

Abstract

The embodiment of the application provides a CSI measuring method and device. And sending configuration information of a CSI report to the UE at the base station, wherein the CSI report is associated with the ZP CSI-RS subsets, and each ZP CSI-RS in the ZP CSI-RS subsets corresponds to one adjacent cell. After the UE determines the ZP CSI-RS subsets, the adjacent cell interference is measured based on each ZP CSI-RS in the ZP CSI-RS subsets, the CSI is calculated according to the measured adjacent cell interference, and the CSI is sent to the base station. By the CSI measurement method, the number of the configured ZP CSI-RSs can be effectively reduced, and the utilization rate of resources is improved.

Description

Method and device for measuring channel state information

Technical Field

The embodiment of the application relates to the field of wireless communication, in particular to a method and a device for measuring channel state information.

Background

Fifth generation (5)^thgeneration, 5G) mobile communication system and fourth generation (4)^thgeneration, 4G) mobile communication system has a big feature of increasing the support for high-reliable and low-latency communication (URLLC) service. Low-delay and high-reliability requirement and system capacity of URLLC serviceThere is naturally a conflict between the quantity requirements. Low latency means less retransmission opportunities, so URLLC traffic data needs to employ a relatively robust transmission scheme (e.g., more resources) to ensure reliability of transmission, thereby reducing system capacity.

In order to alleviate the contradiction between the requirement of low delay and high reliability and the capacity requirement of the system, a feasible method is to improve the accuracy of channel measurement and interference measurement, so that the network equipment can improve the transmission efficiency of data on the premise of ensuring the delay and reliability of data transmission, thereby improving the system capacity.

Disclosure of Invention

The application provides a CSI measurement method and a device, which can effectively reduce the configured ZP CSI-RS or NZP

The number of CSI-RSs improves the utilization rate of resources.

In a first aspect, the present application provides a method of CSI measurement. The terminal equipment receives configuration information of a first CSI report from the network equipment, the first CSI report is associated with a first ZP CSI-RS subset, the first ZP CSI-RS subset comprises Z1 ZP CSI-RSs, and Z1 is an integer greater than or equal to 2. Further, the terminal device measures the first CSI according to the first ZP CSI-RS subset and sends the first CSI to the network device.

In one possible implementation manner of the first aspect, Z1 ZP CSI-RSs are in one-to-one correspondence with Z1 interferers.

In one possible implementation manner of the first aspect, the terminal device measures Z1 interferences according to Z1 ZP-CSI-RSs and calculates the second CSI according to Z1 interferences.

In a second aspect, the present application provides a method of CSI measurement. The network equipment sends configuration information of a first CSI report to the terminal equipment, the first CSI report is associated with a first ZP CSI-RS subset, the first ZP CSI-RS subset comprises Z1 ZP CSI-RSs, and Z1 is an integer larger than or equal to 2. Further, the network device receives the first CSI from the terminal device, wherein the first CSI is measured according to the first ZP CSI-RS subset.

In one possible implementation manner of the second aspect, Z1 ZP CSI-RSs are in one-to-one correspondence with Z1 interferers.

In a third aspect, the present application provides a CSI measurement method. The terminal device receives information of the ZP CSI-RS set and configuration information of the second CSI report from the network device. Further, the terminal device also receives second indication information from the network device, the second indication information is used for determining a second ZP CSI-RS subset in the ZP CSI-RS set, the second ZP CSI-RS subset comprises Z2 ZP CSI-RSs, and Z2 is a positive integer. And the terminal equipment measures the second CSI according to the second ZP CSI-RS subset and sends the second CSI to the network equipment.

In a possible implementation manner of the third aspect, Z2 ZP CSI-RSs are in one-to-one correspondence with Z2 interferers.

In a possible implementation manner of the third aspect, the terminal device measures Z2 interferences according to Z2 ZP-CSI-RSs and calculates the second CSI according to Z2 interferences.

In one possible implementation manner of the third aspect, the terminal device sends the second CSI to the network device at time unit t1, where t1 is determined according to offset value information in configuration information of the second CSI report.

In one possible implementation manner of the third aspect, when the time interval between t1 and t2 is greater than or equal to the time threshold, the terminal device measures the second CS according to the second ZP CSI-RS subset, where t1 is a time unit when the terminal device sends the second CSI to the network device, and t2 is a time unit when the terminal device receives the second indication information.

In a fourth aspect, the present application provides a method of CSI measurement. And the network equipment sends information of the ZP CSI-RS set and configuration information of the second CSI report to the terminal equipment, and further sends second indication information to the terminal equipment, wherein the second indication information is used for determining a second ZP CSI-RS subset in the ZP CSI-RS set, the second ZP CSI-RS subset comprises Z2 ZP CSI-RSs, and Z2 is a positive integer. And the network equipment receives the second CSI from the terminal equipment, wherein the second CSI is measured according to the second ZP CSI-RS subset.

In one possible implementation manner of the fourth aspect, Z2 ZP CSI-RSs are in one-to-one correspondence with Z2 interferers.

In one possible implementation manner of the fourth aspect, the network device receives the second CSI from the terminal device at time unit t1, where t1 is determined according to the offset value. And the network equipment sends the information of the offset value to the terminal equipment through the configuration information of the second CSI report.

In a possible implementation manner of the fourth aspect, when a time interval between t1 and t2 is greater than or equal to a time threshold, the second CSI is measured according to the second ZP CSI-RS subset, where t1 is a time unit for the network device to receive the second CSI, and t2 is a time unit for the network device to send the second indication information.

In a possible implementation manner of the third aspect or the fourth aspect, Z2 ZP CSI-RSs are in one-to-one correspondence with Z2 interferers.

In a possible implementation manner of the third aspect or the fourth aspect, the second indication information is carried in DCI.

In a possible implementation manner of the third or fourth aspect, the second indication information indicates an index of the second ZP CSI-RS subset in the ZP CSI-RS set.

In a possible implementation manner of the third or fourth aspect, the second indication information indicates an index of each ZP CSI-RS in the second ZP CSI-RS subset in the ZP CSI-RS set.

In a possible implementation manner of the third aspect or the fourth aspect, the second indication information indicates a sequence of interference patterns, the sequence of interference patterns includes Q elements, Q is a repetition period of the interference patterns, and Q is a positive integer. Each element in the sequence of interference patterns corresponds to an interference pattern over a time unit.

In the first, second, third, and fourth aspects, the ZP CSI-RSs in the ZP CSI-RS subset may correspond to neighboring cells one to one, so that the number of configured ZP CSI-RSs may be greatly reduced, and the utilization rate of resources is improved.

In a fifth aspect, the present application provides a method of CSI measurement. The terminal equipment receives configuration information of a third CSI report from the network equipment, and determines a first NZP CSI-RS subset according to the configuration information of the third CSI report, wherein the first NZP CSI-RS subset comprises N NZP CSI-RSs, and N is a positive integer. Further, the terminal device measures third CSI according to the first NZPCCSI-RS subset and sends the third CSI to the network device.

In a possible implementation manner of the fifth aspect, the N NZP CSI-RSs are in one-to-one correspondence with the N interferers.

In a possible implementation manner of the fifth aspect, the terminal device measures the N interferences according to the N NZP-CSI-RSs, and calculates the third CSI according to the N interferences.

In a sixth aspect, the present application provides a method of CSI measurement. And the network equipment sends the configuration information of the third CSI report to the terminal equipment. Further, the network device receives a third CSI from the terminal device, where the third CSI is measured according to the first NZP CSI-RS subset, and the first NZP CSI-RS subset is determined according to configuration information of the third CSI report.

In a possible implementation manner of the sixth aspect, the N NZP CSI-RSs correspond to the N interferers one to one.

In a possible implementation manner of the fifth aspect or the sixth aspect, the third CSI report associates the first NZP CSI-RS subset with a first parameter, where the first parameter indicates whether the first NZP CSI-RS subset is only used for measuring neighbor cell interference.

In a possible implementation manner of the fifth aspect or the sixth aspect, the third CSI report associates the first NZP CSI-RS subset and the second NZP CSI-RS subset, wherein the first NZP CSI-RS subset is only used for measuring neighbor cell interference.

In a possible implementation manner of the fifth aspect or the sixth aspect, the first NZP CSI-RS subset is a subset of an NZP CSI-RS set, the third CSI report is associated with the NZP CSI-RS set, and each NZP CSI-RS in the NZP CSI-RS set is associated with a second parameter, where the second parameter indicates whether the corresponding NZP CSI-RS is only used for measuring interference of a neighboring cell.

In the fifth aspect and the sixth aspect, the NZP CSI-RSs in the NZP CSI-RS subset may correspond to neighboring cells one to one, so that the number of configured NZP CSI-RSs may be greatly reduced, the resource overhead of the NZP CSI-RSs is reduced, more time-frequency resources may be used for data transmission, and the spectrum efficiency of the system is improved.

In a seventh aspect, there is provided a communications device comprising functional modules for implementing the methods in the first aspect or any possible implementation manner of the first aspect; or comprises functional modules for implementing the methods in the foregoing third aspect or any possible implementation manner of the third aspect; or functional modules for implementing the methods of the fifth aspect or any possible implementation of the fifth aspect.

In an eighth aspect, there is provided a communications apparatus comprising functional modules for implementing the methods of the second aspect or any possible implementation manner of the second aspect; or functional modules for implementing the methods of the fourth aspect or any possible implementation manner of the fourth aspect; or functional modules for implementing the methods of the sixth aspect or any possible implementation manner of the sixth aspect.

In a ninth aspect, there is provided a communication device comprising a processor and an interface circuit, the interface circuit being configured to receive signals from other communication devices than the communication device and transmit the signals to the processor or send the signals from the processor to other communication devices than the communication device, the processor being configured to implement the method of the first aspect or any possible implementation manner of the first aspect by logic circuits or executing code instructions; or for implementing the method in the aforementioned third aspect or any possible implementation manner of the third aspect; or for implementing the method of the foregoing fifth aspect or any possible implementation manner of the fifth aspect.

A tenth aspect provides a communication device, comprising a processor and an interface circuit, wherein the interface circuit is used for receiving signals from other communication devices except the communication device and transmitting the signals to the processor or sending the signals from the processor to other communication devices except the communication device, and the processor is used for realizing the method in the second aspect or any possible implementation manner of the second aspect through logic circuits or executing code instructions; or for implementing the method in any possible implementation manner of the fourth aspect or the fourth aspect; or for implementing the method in any possible implementation manner of the aforementioned sixth aspect or sixth aspect.

In an eleventh aspect, there is provided a computer readable storage medium having stored therein a computer program or instructions which, when executed, implement the method of the first aspect or any possible implementation manner of the first aspect; or implementing a method in the foregoing third aspect or any possible implementation manner of the third aspect; or implementing the method of the foregoing fifth aspect or any possible implementation manner of the fifth aspect.

In a twelfth aspect, there is provided a computer readable storage medium having stored therein a computer program or instructions which, when executed, implement the method of the second aspect or any possible implementation manner of the second aspect; or implementing a method in any possible implementation of the fourth aspect or the fourth aspect; or implementing the method of any possible implementation of the aforementioned sixth aspect or aspects.

In a thirteenth aspect, there is provided a computer program or computer program product comprising instructions which, when executed, implement the first aspect or the method in any possible implementation manner of the first aspect; or implementing a method in the foregoing third aspect or any possible implementation manner of the third aspect; or implementing the method of the foregoing fifth aspect or any possible implementation manner of the fifth aspect.

In a fourteenth aspect, there is provided a computer program or computer program product comprising instructions which, when executed, implement the method of the second aspect or any possible implementation of the second aspect; or implementing a method in any possible implementation of the fourth aspect or the fourth aspect; or implementing the method of any possible implementation of the aforementioned sixth aspect or aspects.

A fifteenth aspect provides a communication system comprising the communication apparatus of the seventh or ninth aspect and the communication apparatus of the eighth or tenth aspect.

Drawings

Fig. 1 is a schematic architecture diagram of a mobile communication system applied in an embodiment of the present application;

fig. 2 is a schematic flow chart of a CSI measurement method provided in the present application;

fig. 3 is a schematic flow chart of another CSI measurement method provided in the present application;

fig. 4 is a schematic flow chart of a CSI measurement method provided in the present application;

fig. 5 is a schematic structural diagram of a communication device according to an embodiment of the present application;

fig. 6 is a schematic structural diagram of another communication device according to an embodiment of the present application.

Detailed Description

Fig. 1 is an architecture diagram of a mobile communication system to which an embodiment of the present application is applied. As shown in fig. 1, the mobile communication system includes a core network device 110, a radio access network device 120, and at least one terminal device (e.g., a terminal device 130 and a terminal device 140 in fig. 1). The terminal equipment is connected with the wireless access network equipment in a wireless mode, and the wireless access network equipment is connected with the core network equipment in a wireless or wired mode. The core network device and the radio access network device may be separate physical devices, or the function of the core network device and the logical function of the radio access network device may be integrated on the same physical device, or a physical device may be integrated with a part of the function of the core network device and a part of the function of the radio access network device. The terminal equipment may be fixed or mobile. Fig. 1 is a schematic diagram, and other network devices, such as a wireless relay device and a wireless backhaul device, may also be included in the communication system, which are not shown in fig. 1. The embodiments of the present application do not limit the number of core network devices, radio access network devices, and terminal devices included in the mobile communication system.

The terminal equipment is connected with the wireless access network equipment in a wireless mode so as to access the mobile communication system. The radio access network device may be a base station (base station), an evolved NodeB (eNodeB), a Transmission Reception Point (TRP), a next generation base station (gNB) in a 5G mobile communication system, a base station in a future mobile communication system, or an access node in a WiFi system, etc.; or may be a module or a unit that performs part of the functions of the base station, for example, a Centralized Unit (CU) or a Distributed Unit (DU). The embodiments of the present application do not limit the specific technologies and the specific device forms adopted by the radio access network device. In this application, a radio access network device is referred to as a network device for short, and if no special description is provided, the network device refers to a radio access network device.

A terminal device may also be referred to as a terminal, User Equipment (UE), a mobile station, a mobile terminal, etc. The terminal device can be a mobile phone, a tablet computer, a computer with a wireless transceiving function, a virtual reality terminal device, an augmented reality terminal device, a wireless terminal in industrial control, a wireless terminal in unmanned driving, a wireless terminal in remote operation, a wireless terminal in a smart grid, a wireless terminal in transportation safety, a wireless terminal in a smart city, a wireless terminal in a smart home and the like. The embodiment of the present application does not limit the specific technology and the specific device form adopted by the terminal device.

The network equipment and the terminal equipment can be deployed on land, including indoor or outdoor, handheld or vehicle-mounted; can also be deployed on the water surface; it may also be deployed on airborne airplanes, balloons and satellite vehicles. The embodiment of the application does not limit the application scenarios of the network device and the terminal device.

The network device and the terminal device can communicate through the authorized spectrum, can communicate through the unlicensed spectrum, and can communicate through both the authorized spectrum and the unlicensed spectrum. The network device and the terminal device may communicate with each other through a frequency spectrum of 6 gigahertz (GHz) or less, through a frequency spectrum of 6GHz or more, or through both a frequency spectrum of 6GHz or less and a frequency spectrum of 6GHz or more. The embodiments of the present application do not limit the spectrum resources used between the network device and the terminal device.

In the embodiment of the present application, the execution subject may be a network device and a terminal device, or may be a module (e.g., a chip) applied to the network device and a module (e.g., a chip) applied to the terminal device.

For convenience of description, the present application describes a base station as an example of a network device and a UE as an example of a terminal device. In order for a UE to communicate with a base station, it needs to establish a radio connection with a cell controlled by the base station. The cell in which the radio connection is established with the UE is referred to as a serving cell of the UE. When the UE communicates with the serving cell, it is also interfered by signals from neighboring cells.

In a general communication system, it is generally difficult to predict the neighbor cell interference in actual data transmission according to the measured neighbor cell interference, because the magnitude of the neighbor cell interference is related to the traffic of the neighbor cell and the channel quality of the UE communicating with the neighbor cell. The traffic volume of the neighboring cell and the channel quality of the UE communicating with the neighboring cell are time-varying and difficult to predict accurately.

A typical application scenario of URLLC service is for automation control in the field of industrial control, where the environment is relatively closed and the arrival of service data is periodic and deterministic. That is, when each cell has data to transmit, it is known to which UE to transmit. By utilizing the prior information, a more accurate interference measurement and feedback mechanism can be designed.

In an existing 5G New Radio (NR) system, two CSI-RSs in a downlink channel state information-reference signal (CSI-RS) may be used for measuring channel and interference, one is a non-zero-power (NZP) CSI-RS, and the other is a zero-power (ZP) CSI-RS. After measuring the channel and the interference, the UE may feed back Channel State Information (CSI) obtained by the measurement to the base station. The base station can perform data scheduling based on the CSI fed back by the UE, so that the data transmission efficiency is improved.

When the NZP CSI-RS is used for channel measurement, the base station may notify the UE of detailed configuration information of the NZP CSI-RS, so that the UE may measure characteristics of a radio channel experienced by the NZP CSI-RS. When the ZP CSI-RS is used for interference measurement, the base station informs the UE of which ZP CSI-RS the interference of the adjacent cell is measured on, and the UE assumes that the serving cell does not send any signal on the time-frequency resource corresponding to the ZP CSI-RS, and at this time, the UE receives the interference. When the NZP CSI-RS is used for interference measurement, the UE may first measure interference between multiple-user multiple-input multiple-output (MU-MIMO) paired UEs in a cell based on the NZP CSI-RS, and then the UE subtracts the interference between the UEs from the total received power to obtain interference between the cells.

There are three modes for CSI-RS transmission: periodic transmission, semi-persistent transmission, and aperiodic transmission. For the CSI-RS transmitted periodically, the base station transmits the CSI-RS once every period T1. For the CSI-RS transmitted semi-continuously, after configuring the relevant parameters to the UE, the base station may notify the UE through Downlink Control Information (DCI) or a media access control element (MAC CE) that the base station will transmit the CSI-RS for the first time, and after transmitting the CSI-RS for the first time, the base station will transmit the CSI-RS once every period T1. For the aperiodic transmitted CSI-RS, the base station may notify the UE through DCI or MAC CE each time the CSI-RS is transmitted. The unit of T1 may be a time domain symbol, a time slot, or other time units.

The CSI may have a plurality of different reporting quantities (reporting metrics), and may include at least one of a Channel Quality Indicator (CQI), a Precoding Matrix Indicator (PMI), and a Rank Indicator (RI), for example.

The type of CSI report may also be referred to as a feedback mode of CSI, and there may be three different feedback modes: the method comprises periodic feedback, wherein the corresponding CSI is called periodic CSI (periodic CSI, P-CSI); semi-persistent feedback, the corresponding CSI is called semi-persistent CSI (SP-CSI); aperiodic feedback, the corresponding CSI is called aperiodic CSI (a-CSI). For P-CSI, the UE feeds back once every other period T2; for the SP-CSI, after the base station configures the relevant parameters, the base station may trigger CSI feedback through DCI or MAC CE, and the UE feeds back the CSI once every period T2; for a-CSI, each CSI feedback may be triggered by the base station through DCI or MAC CE. The unit of T2 may be a time domain symbol, a time slot, or other time units. After receiving the CSI, the base station may perform scheduling according to the last received CSI.

In the embodiment of the present application, the time domain symbol may be an Orthogonal Frequency Division Multiplexing (OFDM) symbol, or may be a Discrete Fourier Transform-spread-OFDM (DFT-s-OFDM) symbol. The symbols in the embodiments of the present application all refer to time domain symbols, if not otherwise specified.

Fig. 2 is a schematic flow chart of a CSI measurement method provided in the present application. In the method, each ZP CSI-RS corresponds to one interference, and one interference corresponds to one interference source or a group of interference sources, for example, each ZP CSI-RS corresponds to one interference cell or one interference cell set. In the CSI measuring method, in order to measure the interference of the adjacent cells, the quantity of the ZP CSI-RSs is in direct proportion to the quantity of the adjacent cells, so that the quantity of the ZP CSI-RSs is effectively reduced, and the utilization rate of resources is improved. It is understood that, in various embodiments of the present application, the execution subject of the method may be a base station and a UE, or may be a module (e.g., a chip) applied in the base station or the UE.

S210, the base station sends configuration information of a first CSI report to the UE, the first CSI report is associated with a first ZP CSI-RS subset, and the first ZP CSI-RS subset comprises Z1 ZP CSI-RSs. Wherein Z1 is an integer of 1 or 2. Correspondingly, the UE receives configuration information of the first CSI report.

The Z1 ZP CSI-RSs correspond to the Z1 interferers one by one. Each of the Z1 interferers may be from one interferer or from a group of interferers. It can also be understood that one ZP CSI-RS corresponds to one interferer or to a group of interferers. For the serving cell, the signal of the neighbor cell is an interference. Therefore, the interference source may be a neighborhood region, and the set of interference sources may be a set of neighborhood regions.

In the following, description is given by taking an example that one ZP CSI-RS corresponds to one neighboring cell or corresponds to an interference signal from one neighboring cell. Assume that the first ZP CSI-RS is one ZP CSI-RS in the first ZP CSI-RS subset. The serving cell of the UE1 is cell 1, the serving cell of the UE2 is cell 2, the serving cell of the UE3 is cell 3, and the coverage areas of the cells 1, 2, and 3 are adjacent. The first ZP CSI-RS corresponds to cell 2, and for cell 1 and cell 3, the first ZP CSI-RS can also be understood to correspond to an interference signal from cell 2. At the time-frequency position corresponding to the first ZP CSI-RS, only cell 2 is transmitting CSI-RS, and cell 1 and cell 3 are not transmitting any signal at the time-frequency position corresponding to the first ZP CSI-RS, so that UE1 and UE3 can simultaneously measure the interference signal strength of cell 2 at the time-frequency position corresponding to the first ZP CSI-RS.

By adopting the configuration mode, the number of the ZP CSI-RSs of the system is equal to the number of the cells in the system, and the number of the ZP CSI-RSs can be greatly reduced, so that the resources reserved for the ZP CSI-RSs are reduced, and the resource utilization rate of the system is improved. If the cells are grouped, namely one ZP CSI-RS corresponds to a group of cells, the requirement of the system on the ZP CSI-RS can be further reduced. Taking the adjacent cell interference as an example, the Z1 adjacent cells corresponding to the Z1 ZP CSI-RSs in this example may be Z1 of the Z adjacent cells, and Z is an integer greater than or equal to Z1. Because the adjacent cell interference suffered by the UE in different time units may be changed, the base station can determine the change condition of the interference mode on a time axis by predicting an arrival model of adjacent cell service data, and configure a plurality of CSI reports for the UE, wherein each CSI report is associated with a ZP CSI-RS subset and respectively corresponds to different time units. Since interference is relatively fixed and predictable in an industrially controlled closed environment, the interference pattern is likely to be periodic. For the periodic interference pattern, the number of CSI reports configured for the UE by the base station is equal to the period of the interference pattern. For example, if the interference pattern period is 4 slots, the base station may configure 4 CSI reports for the UE, one-to-one corresponding to four ZP CSI-RS subsets. The interference mode is the interference to which neighboring cells the UE in the cell will be interfered with in a certain time unit.

S220, the UE measures the first CSI according to the first ZP CSI-RS subset.

Specifically, the UE may measure Z1 interferences corresponding to Z1 ZP CSI-RSs according to Z1 ZP CSI-RSs in the first ZP CSI-RS subset, and then calculate the first CSI according to the measured Z1 interferences. For example, the CQI is calculated from the sum of Z1 interferences.

For example, in the time unit 1, besides the serving cell, there are Z1 neighboring cells (neighboring cell 1, neighboring cell 2 … …, and neighboring cell Z1) that have data to send, so the UE can measure the interference size of Z1 neighboring cells according to the configured Z1 ZP CSI-RSs, and can calculate CQI according to the Z1 interference and report the CQI to the base station, assuming that the CQI takes the value of CQI 1. If the interference scenario of time unit 2 after time unit 1 is the same as time unit 1, that is, there are also Z1 neighbors (neighbor 1, neighbor 2 … …, and neighbor Z1) with data transmission except for the serving cell, that is, the interference pattern of time unit 2 is the same as the interference pattern of time unit 1. The base station may schedule the data of time unit 2 according to CQI1 corresponding to time unit 1, and select an appropriate transport block size and modulation scheme for data transmission.

In each embodiment of the present application, a unit of a time unit may be a time domain symbol, a slot (slot), a sub-slot (sub-slot) or a mini-slot (mini-slot), and the present application is not limited thereto.

S230, the UE sends the first CSI to the base station, which may also be referred to as sending the first CSI report to the base station by the UE, or referred to as reporting the first CSI to the base station by the UE. Correspondingly, the base station receives the first CSI, which may also be referred to as the base station receiving the first CSI report.

In this application, CSI and CSI reports may generally be identical, e.g., sending CSI and sending CSI reports may be identical. When CSI reports and CSI occur in the same words, CSI reports may be understood as signaling or messages containing CSI.

The configuration information of the first CSI report may include a type of the first CSI report. For P-CSI, each ZP CSI-RS in the first subset of ZP CSI-RSs is transmitted periodically. For SP-CSI, each ZP CSI-RS in the first subset of ZP CSI-RSs may be transmitted periodically or semi-continuously. For a-CSI, each ZP CSI-RS in the first subset of ZP CSI-RSs may be transmitted periodically, or may be transmitted semi-continuously, or may be transmitted non-periodically.

The configuration information of the first CSI report may further include information of a period and an offset value of the first CSI report. Specifically, for P-CSI and SP-CSI, the configuration information of the first CSI report may further include a period of the first CSI report. For the SP-CSI and the a-CSI, offset value information may also be included in the configuration information of the first CSI report. For SP-CSI, offset value information may be used to determine a time domain location where first CSI is first transmitted; for a-CSI, offset value information may be used to determine a time domain location where the first CSI is transmitted. The time domain position may be specifically a number of a slot or a symbol, an index of a slot or a symbol, or a time domain position counted in other time units.

The configuration information of the first CSI report may further include a specific report amount included in the first CSI report, for example, reporting at least one of CQI, PMI, and RI.

Fig. 3 is a schematic flow chart of another CSI measurement method provided in the present application. In the method, a base station configures a ZP CSI-RS set for UE, then indicates a second ZP CSI-RS subset in the ZP CSI-RS set through indication information, the second ZP CSI-RS subset can be associated with a plurality of CSI reports, and then the UE measures CSI according to the second ZP CSI-RS subset and sends the measured CSI to the base station in a corresponding CSI report. Similar to the method in fig. 2, each ZP CSI-RS in the second ZP CSI-RS subset corresponds to one interference, one interference to one interference source or a group of interference sources, e.g. each ZP CSI-RS corresponds to one interfering cell or one set of interfering cells. In the CSI measuring method, in order to measure the interference of the adjacent cells, the quantity of the ZP CSI-RSs is in direct proportion to the quantity of the adjacent cells, so that the quantity of the ZP CSI-RSs is effectively reduced, and the utilization rate of resources is improved.

S310, the base station sends information of the ZP CSI-RS set to the UE. Correspondingly, the UE receives information of the ZP CSI-RS set from the base station. The ZP CSI-RS set may include Z ZP CSI-RSs, Z being 1 or an integer greater than or equal to 2.

Specifically, the base station may send information of the ZP CSI-RS set to the UE through a broadcast message or a UE-specific Radio Resource Control (RRC) message.

The Z ZP CSI-RSs correspond to the Z interferences one by one. Each of the Z interferers may be from one interferer or from a group of interferers. It can also be understood that one ZP CSI-RS corresponds to one interferer or to a group of interferers. For the serving cell, the signal of the neighbor cell is an interference. Therefore, the interference source may be a neighborhood region, and the set of interference sources may be a set of neighborhood regions.

S320, the base station sends the configuration information of the second CSI report to the UE. Correspondingly, the UE receives configuration information of the second CSI report from the base station.

The configuration information of the second CSI report may include a type of CSI report, a periodicity of CSI report, offset value information, and a specific reporting amount, and the related detailed description may refer to the related description of the configuration information of the first CSI report in fig. 2.

The base station may also configure multiple CSI reports to the UE at the same time, that is, the configuration information that the base station sends the CSI report to the UE may include multiple CSI reports with different parameter values, for example, the types of the CSI reports are different, or the report amounts of the CSI reports are different, or the parameters of CSI measurement are different, and the like.

S330, the base station sends second indication information to the UE, wherein the second indication information is used for determining a second ZP CSI-RS subset in the ZP CSI-RS set, the second ZP CSI-RS subset comprises Z2 ZP CSI-RSs, and Z2 is a positive integer. It is understood that Z2 is equal to or less than Z. Correspondingly, the UE receives the second indication information from the base station.

Specifically, the second indication information may be different information from configuration information of the second CSI report or information triggering CSI report. The second indication information may be carried in DCI or MAC CE, e.g., the second indication information is a field in DCI or MA CCE.

Specifically, the ZP CSI-RS set in S310 may have different implementations. Implementation mode 1 of ZP CSI-RS set: the ZP CSI-RS set comprises N ZP CSI-RS subsets, and each ZP CSI-RS subset corresponds to one number or index. Implementation mode 2 of zcsi-RS set: the ZP CSI-RS set comprises M ZP CSI-RSs, and each ZP CSI-RS corresponds to one number or index. In various embodiments of the present application, the numbering and indexing functions are the same and may be used interchangeably.

For ZP CSI-RS set implementation 1, the second indication information may indicate an index of the second ZP CSI-RS subset in the ZP CSI-RS set. For ZP CSI-RS set implementation 2, the second indication information may indicate an index of each ZP CSI-RS in the second ZP CSI-RS subset in the ZP CSI-RS set. For the ZP CSI-RS set implementation mode 2, the second indication information may also indicate, in a bitmap mode, which ZP CSI-RSs in the ZP CSI-RS set form the second ZP CSI-RS subset, for example, each bit in the bitmap corresponds to one ZP CSI-RS in the ZP CSI-RS set, and indicates whether the ZP CSI-RS is a ZP CSI-RS in the second ZP CSI-RS subset. For example, a bit value in the bitmap is 1, which indicates that the ZP CSI-RS corresponding to the bit is the ZP CSI-RS in the second ZP CSI-RS subset; and the value of a bit in the bit bitmap is 0, which indicates that the ZP CSI-RS corresponding to the bit is not the ZP CSI-RS in the second ZP CSI-RS subset.

Optionally, before the base station has not sent the second indication information to the UE, or before the UE has not successfully received the second indication information, the protocol may predefine a certain ZP CSI-RS subset in the ZP CSI-RS set as the second ZP CSI-RS subset. For example, the ZP CSI-RS subset with index 0 in the ZP CSI-RS set may be used as the second ZP CSI-RS subset. Or before the base station has not sent the second indication information to the UE, or before the UE has not successfully received the second indication information, the UE may measure the CSI according to the ZP CSI-RS configuration information indicated in the configuration information of the second CSI report.

The second ZP CSI-RS subset determined by the UE may be simultaneously associated with the one or more CSI reports configured in S320, i.e. CSI in the one or more CSI reports configured in S320 is measured based on the second ZP CSI-RS subset.

It is understood that S320 may be performed before S330, and S320 may also be performed after S330.

S340, the UE measures a second CSI according to the second ZP CSI-RS subset.

Specifically, how the UE measures the second CSI according to the second ZP CSI-RS subset may refer to a description related to the UE measuring the first CSI according to the first ZP CSI-RS subset in S220.

S350, the UE sends the second CSI to the base station. Correspondingly, the base station receives the second CSI from the UE.

Specifically, the UE transmits the second CSI to the base station at time element t 1. For the SP-CSI or a-CSI, t1 is determined according to offset value information in the configuration information of the second CSI report, or jointly determined according to offset value information in the configuration information of the second CSI report and indication information in the DCI triggering the SP-CSI or a-CSI. For the SP-CSI, the UE also periodically transmits the second CSI at time unit T1+ n × T2, where n is a positive integer and T2 is the reporting period in the configuration information of the second CSI report. It can be appreciated that the values of the second CSI sent in different time units may be different, because the corresponding interference may change, and the second CSI is obtained according to the latest measured interference.

Consider that the UE requires a certain processing time from CSI measurement to sending CSI. When a time interval between the time unit t1 when the CSI is transmitted and the time unit t2 when the UE receives the second indication information is greater than or equal to a time threshold, the UE measures a second CS according to the second ZPSCSI-RS subset. When a time interval between the time unit t1 when the CSI is transmitted and the time unit t2 when the UE receives the second indication information is less than a time threshold, the UE ignores the second indication information. Optionally, when a time interval between time unit t1 when the CSI is transmitted and time unit t2 when the UE receives the second indication information is less than a time threshold, the UE measures the CSI according to a third ZP CSI-RS subset, wherein the third ZP CSI-RS subset is determined according to the second indication information received last, or, when there is no second indication information received before time unit t2, the third ZP CSI-RS subset is a protocol default ZP CSI-RS subset or a default ZP CSI-RS subset indicated in configuration information of the second CSI report.

Optionally, the second indication information in S330 may also indirectly indicate the second ZP CSI-RS subset by indicating a sequence of interference patterns instead of directly indicating the second ZP CSI-RS subset. The interference pattern sequence comprises Q elements, wherein Q is a repetition period of the interference pattern, and Q is a positive integer. Each element in the sequence of interference patterns corresponds to an interference pattern over a time unit. Since each interference corresponds to one ZP CSI-RS, a second ZP CSI-RS subset for CSI measurement may be determined by the interference pattern.

The start time unit corresponding to the first element of the interference pattern sequence may be indicated by the second indication information, or may be predefined for the protocol. For example, the UE determines that the start time unit corresponding to the first element of the interference pattern sequence is time unit t 0.

The UE may determine, according to the transmission time unit t1 of the second CSI, that the interference pattern corresponding to the time unit t1 is the interference pattern corresponding to the qth element in the interference pattern sequence. It is also understood that q is determined according to t 1. Specifically, the UE may determine q from t1 and t 0. For example, Q ═ mod (D, Q) +1, where D is the time interval between time unit t1 and time unit t0, and D and Q are of the same time granularity, e.g., both slots, or both mini-slots.

Take an interfering source of an interference as an adjacent area as an example. Assuming that the repetition period of the interference pattern is 4 time slots, and in time slot 0, the interference cells are cell 0, cell 1 and cell 2; in time slot 1, the interference cells are cell 1, cell 2 and cell 3; in time slot 2, the interfering cells are cell 2, cell 3 and cell 0; in time slot 3, the interference cells are cell 3, cell 0 and cell 1; in time slot 4, the interfering cells are cell 0, cell 1, and cell 2.

Fig. 4 is a schematic flow chart of a CSI measurement method provided in the present application. In the method, a base station configures a CSI report for UE (user equipment), the UE determines a first NZP CSI-RS subset according to configuration information of the CSI report, and then the UE measures CSI according to the first NZP CSI-RS subset and sends the measured CSI to the base station. Each NZP CSI-RS in the first NZP CSI-RS subset corresponds to one interference, one interference corresponds to one interference source or a group of interference sources, e.g., each NZP CSI-RS corresponds to one interfering cell or one set of interfering cells. In the CSI measuring method, in order to measure the interference of the adjacent cells, the number of the NZP CSI-RSs is in direct proportion to the number of the adjacent cells, so that the number of the NZP CSI-RSs is effectively reduced, the resource overhead of the NZP CSI-RSs is reduced, more time-frequency resources can be used for data transmission, and the spectrum efficiency of a system is improved.

S410, the base station sends the configuration information of the third CSI report to the UE. Correspondingly, the UE receives configuration information of a third CSI report from the base station.

The configuration information of the third CSI report may include a type of CSI report, a periodicity of CSI report, offset value information, and a specific reporting amount, and the related detailed description may refer to the related description of the configuration information of the first CSI report in fig. 2.

S420, the UE determines a first NZP CSI-RS subset according to the configuration information of the third CSI report, wherein the first NZP CSI-RS subset comprises N NZP CSI-RSs, and N is a positive integer.

The N NZP CSI-RSs correspond to the N interferences one by one. Each of the N interferers may be from one interferer or from a group of interferers. It can also be understood that one NZP CSI-RS corresponds to one interferer or to a group of interferers. For the serving cell, the signal of the neighbor cell is an interference. Therefore, the interference source may be a neighborhood region, and the set of interference sources may be a set of neighborhood regions.

Specifically, the configuration information of the third CSI report has different implementations, so that the UE can determine the first NZP CSI-RS subset according to the configuration information of the third CSI report.

The implementation mode is as follows: the third CSI report associates the first NZP CSI-RS subset with a first parameter, wherein the first parameter indicates whether the first NZP CSI-RS subset is used only for measuring neighbor cell interference. For example, when the first parameter value is a first preset value, the first NZP CSI-RS subset is only used for measuring interference of the neighboring cell; and when the first parameter value is a second preset value, the first NZPCCSI-RS subset is used for measuring the interference between the UE in the cell and the interference of the adjacent cell. Or the first parameter exists and indicates that the first NZP CSI-RS subset is only used for measuring the interference of the adjacent cell; the first parameter is absent, indicating that the first NZP CSI-RS subset is used for measuring both intra-cell inter-UE interference and neighbor cell interference.

The implementation mode two is as follows: the third CSI report associates the first and second NZP CSI-RS subsets, wherein the first NZP CSI-RS subset is only used for measuring neighbor cell interference. The second NZP CSI-RS subset is used for measuring both inter-UE interference within a cell and neighbor cell interference.

The implementation mode is three: the first NZP CSI-RS subset is a subset of the NZP CSI-RS set, the third CSI report is associated with the NZP CSI-RS set, each NZP CSI-RS in the NZP CSI-RS set is associated with a second parameter, and the second parameter indicates whether the corresponding NZP CSI-RS is only used for measuring the interference of the adjacent cell. In other words, the NZP CSI-RS set includes a first NZP CSI-RS, which is associated with a second parameter indicating whether the first NZP CSI-RS is used only for measuring neighbor cell interference. For example, when the value of the second parameter is a third preset value, the first NZP CSI-RS is only used for measuring the interference of the neighboring cell; and when the value of the second parameter is a fourth preset value, the first NZP CSI-RS is used for measuring the interference between the UE in the cell and the interference of the adjacent cell. Or the second parameter exists and indicates that the first NZP CSI-RS is only used for measuring the interference of the adjacent cell; the second parameter does not exist, which means that the first NZP CSI-RS is used for measuring both inter-UE interference and neighbor cell interference in the cell. The NZP CSI-RS set is only used for measuring neighbor cell interference NZP CSI-RS to form a first NZP CSI-RS subset.

It can be appreciated that, when the base station configures the UE with multiple CSI reports, the UE may determine multiple NZP CSI-RS subsets for measuring different CSI according to configuration information of the multiple CSI reports.

S430, the UE measures a third CSI according to the first NZP CSI-RS subset.

Specifically, the UE may measure N interferences corresponding to the N NZP CSI-RSs in the first NZP CSI-RS subset, and then calculate the third CSI according to the measured N interferences. For example, the CQI is calculated from the sum of the N interferences.

S440, the UE sends the third CSI to the base station. Correspondingly, the base station receives the third CSI from the UE.

For a detailed description about the UE transmitting the third CSI to the base station, reference may be made to S230 in fig. 2.

In the above embodiments of fig. 2, fig. 3 and fig. 4, the base station may transmit DCI or MAC CE trigger CSI report to the UE, which may also be referred to as triggering CSI transmission or triggering CSI report transmission. Specifically, the DCI or the MAC CE may include first indication information, and the first indication information triggers a CSI report. Here, the CSI report may be a first CSI report, a second CSI report, or a third CSI report, and the type of the CSI report may be SP-CSI or a-CSI.

It is to be understood that, in order to implement the functions in the above embodiments, the network device and the terminal device include hardware structures and/or software modules for performing the respective functions. Those of skill in the art will readily appreciate that the various illustrative elements and method steps described in connection with the embodiments disclosed herein may be implemented as hardware or combinations of hardware and computer software. Whether a function is performed as hardware or computer software driven hardware depends on the particular application scenario and design constraints imposed on the solution.

Fig. 5 and 6 are schematic structural diagrams of a possible communication device provided in an embodiment of the present application. These communication devices can be used to implement the functions of the terminal device or the network device in the above method embodiments, so that the beneficial effects of the above method embodiments can also be achieved. In the embodiment of the present application, the communication apparatus may be the terminal device 130 or the terminal device 140 shown in fig. 1, may also be the radio access network device 120 shown in fig. 1, and may also be a module (e.g., a chip) applied to the terminal device or the network device.

As shown in fig. 5, the communication device 500 includes a processing unit 510 and a transceiving unit 520. The communication apparatus 500 is used to implement the functions of the base station or the UE in the method embodiments shown in fig. 2, fig. 3, or fig. 4.

When the communication apparatus 500 is used to implement the functionality of the UE in the method embodiment shown in fig. 2: the transceiving unit 520 is configured to receive configuration information of a first CSI report from a base station, where the first CSI report is associated with a first ZP CSI-RS subset, and the first ZP CSI-RS subset includes Z1 ZP CSI-RSs; processing unit 510 is to measure a first CSI from the first ZP CSI-RS subset; the transceiving unit 520 is further configured to transmit the first CSI to the base station. The transceiving unit 520 is further configured to receive first indication information from the base station through the DCI or the MAC CE, where the first indication information triggers transmission of the first CSI.

When the communication apparatus 500 is used to implement the functionality of the base station in the method embodiment shown in fig. 2: the transceiving unit 520 is configured to send configuration information of a first CSI report to the UE, where the first CSI report is associated with a first ZP CSI-RS subset, and the first ZP CSI-RS subset includes Z1 ZP CSI-RSs; the transceiving unit 520 is further configured to receive a first CSI from the UE, the first CSI being measured according to the first ZP CSI-RS subset. Optionally, the processing unit 510 is configured to perform downlink data scheduling according to the first CSI. The transceiving unit 520 is further configured to transmit first indication information to the UE through the DCI or the MAC CE, where the first indication information triggers transmission of the third CSI.

When the communication apparatus 500 is used to implement the functionality of the UE in the method embodiment shown in fig. 3: the transceiving unit 520 is configured to receive information of the ZP CSI-RS set from the base station; the transceiver unit 520 is further configured to receive configuration information of a second CSI report from the base station; the transceiving unit 520 is further configured to receive second indication information from the base station, where the second indication information is used to determine a second ZP CSI-RS subset in the ZP CSI-RS set, and the second ZP CSI-RS subset includes Z2 ZP CSI-RSs; processing unit 510 is to measure a second CSI from the second ZP CSI-RS subset; the transceiver unit 520 is further configured to transmit the second CSI to the base station. The transceiving unit 520 is further configured to receive first indication information from the base station through the DCI or the MAC CE, where the first indication information triggers transmission of the second CSI.

When the communication apparatus 500 is used to implement the functionality of the base station in the method embodiment shown in fig. 3: the transceiving unit 520 is configured to send information of the ZP CSI-RS set to the UE; the transceiving unit 520 is further configured to send configuration information of the second CSI report to the UE; the transceiving unit 520 is further configured to send second indication information to the UE, where the second indication information is used to determine a second ZP CSI-RS subset in the ZP CSI-RS set, and the second ZP CSI-RS subset includes Z2 ZP CSI-RSs; the transceiving unit 520 is further configured to receive a second CSI from the UE, the second CSI being measured according to a second ZP CSI-RS subset. Optionally, the processing unit 510 is configured to perform downlink data scheduling according to the second CSI. The transceiving unit 520 is further configured to transmit first indication information to the UE through the DCI or the MAC CE, where the first indication information triggers transmission of the third CSI.

When the communication apparatus 500 is used to implement the functionality of the UE in the method embodiment shown in fig. 4: the transceiving unit 520 is configured to receive configuration information of a third CSI report from the base station; processing unit 510 is configured to determine a first NZP CSI-RS subset according to the configuration information of the third CSI report, where the first NZP CSI-RS subset includes N NZP CSI-RS; processing unit 510 is further configured to measure a third CSI from the first NZP CSI-RS subset; the transceiving unit 520 is further configured to transmit third CSI to the base station. The transceiving unit 520 is further configured to receive first indication information from the base station through the DCI or the MAC CE, where the first indication information triggers transmission of the third CSI.

When the communication apparatus 500 is used to implement the functionality of the base station in the method embodiment shown in fig. 4: the transceiving unit 520 is configured to send configuration information of the third CSI report to the UE; the transceiving unit 520 is further configured to receive a third CSI from the UE, where the third CSI is measured according to the first NZP CSI-RS subset, and the first NZP CSI-RS subset is determined according to configuration information of the third CSI report. Optionally, the processing unit 510 is configured to perform downlink data scheduling according to the first CSI. The transceiving unit 520 is further configured to transmit first indication information to the UE through the DCI or the MAC CE, where the first indication information triggers transmission of the third CSI.

More detailed descriptions about the processing unit 510 and the transceiver unit 520 may be directly obtained by referring to the related descriptions in the method embodiments shown in fig. 2, fig. 3, or fig. 4, which are not repeated herein.

As shown in fig. 6, the communication device 600 includes a processor 610 and an interface circuit 620. The processor 610 and the interface circuit 620 are coupled to each other. It is understood that the interface circuit 620 may be a transceiver or an input-output interface. Optionally, the communication device 600 may further include a memory 630 for storing instructions to be executed by the processor 610 or for storing input data required by the processor 610 to execute the instructions or for storing data generated by the processor 610 after executing the instructions.

When the communication device 600 is used to implement the methods shown in fig. 2, fig. 3 or fig. 4, the processor 610 is used to implement the functions of the processing unit 510 in fig. 5, and the interface circuit 620 is used to implement the functions of the transceiving unit 520 in fig. 5.

When the communication device is a chip applied to a terminal device, the terminal device chip implements the functions of the terminal device in the above method embodiment. The terminal device chip receives information from other modules (such as a radio frequency module or an antenna) in the terminal device, wherein the information is sent to the terminal device by the network device; or, the terminal device chip sends information to other modules (such as a radio frequency module or an antenna) in the terminal device, where the information is sent by the terminal device to the network device.

When the communication device is a chip applied to a network device, the network device chip implements the functions of the network device in the above method embodiments. The network device chip receives information from other modules (such as a radio frequency module or an antenna) in the network device, wherein the information is sent to the network device by the terminal device; alternatively, the network device chip sends information to other modules (such as a radio frequency module or an antenna) in the network device, and the information is sent by the network device to the terminal device.

It is understood that the Processor in the embodiments of the present Application may be a Central Processing Unit (CPU), other general purpose Processor, a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), a Field Programmable Gate Array (FPGA) or other Programmable logic device, a transistor logic device, a hardware component, or any combination thereof. The general purpose processor may be a microprocessor, but may be any conventional processor.

The method steps in the embodiments of the present application may be implemented by hardware, or may be implemented by software instructions executed by a processor. The software instructions may be comprised of corresponding software modules that may be stored in Random Access Memory (RAM), flash Memory, Read-Only Memory (ROM), Programmable ROM (PROM), Erasable PROM (EPROM), Electrically EPROM (EEPROM), registers, a hard disk, a removable disk, a CD-ROM, or any other form of storage medium known in the art. An exemplary storage medium is coupled to the processor such the processor can read information from, and write information to, the storage medium. Of course, the storage medium may also be integral to the processor. The processor and the storage medium may reside in an ASIC. In addition, the ASIC may reside in a network device or a terminal device. Of course, the processor and the storage medium may reside as discrete components in a network device or a terminal device.

In the above embodiments, the implementation may be wholly or partially realized by software, hardware, firmware, or any combination thereof. When implemented in software, may be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer programs or instructions. When the computer program or instructions are loaded and executed on a computer, the processes or functions described in the embodiments of the present application are performed in whole or in part. The computer may be a general purpose computer, a special purpose computer, a computer network, a network appliance, a user device, or other programmable apparatus. The computer program or instructions may be stored in a computer readable storage medium or transmitted from one computer readable storage medium to another computer readable storage medium, for example, the computer program or instructions may be transmitted from one website, computer, server, or data center to another website, computer, server, or data center by wire or wirelessly. The computer-readable storage medium can be any available medium that can be accessed by a computer or a data storage device such as a server, data center, etc. that integrates one or more available media. The usable medium may be a magnetic medium, such as a floppy disk, a hard disk, a magnetic tape; or optical media such as Digital Video Disks (DVDs); it may also be a semiconductor medium, such as a Solid State Drive (SSD).

In the embodiments of the present application, unless otherwise specified or conflicting with respect to logic, the terms and/or descriptions in different embodiments have consistency and may be mutually cited, and technical features in different embodiments may be combined to form a new embodiment according to their inherent logic relationship.

In the present application, "at least one" means one or more, "a plurality" means two or more. "and/or" describes the association relationship of the associated objects, meaning that there may be three relationships, e.g., a and/or B, which may mean: a exists alone, A and B exist simultaneously, and B exists alone, wherein A and B can be singular or plural. In the description of the text of the present application, the character "/" generally indicates that the former and latter associated objects are in an "or" relationship; in the formula of the present application, the character "/" indicates that the preceding and following related objects are in a relationship of "division".

It is to be understood that the various numerical references referred to in the embodiments of the present application are merely for descriptive convenience and are not intended to limit the scope of the embodiments of the present application. The sequence numbers of the above-mentioned processes do not mean the execution sequence, and the execution sequence of the processes should be determined by their functions and inherent logic.

Claims

1. A method for measuring Channel State Information (CSI) is characterized by comprising the following steps:

receiving configuration information of a first CSI report from a network device, wherein the first CSI report is associated with a first ZP CSI-RS subset, the first ZP CSI-RS subset comprises Z1 ZP CSI-RSs, and Z1 is an integer greater than or equal to 2;

measuring a first CSI from the first ZP CSI-RS subset;

transmitting the first CSI to the network device.

2. The method of claim 1, wherein the Z1 ZP CSI-RSs are in one-to-one correspondence with Z1 interferers.

3. The method of claim 2, wherein measuring the first CSI according to the first ZP CSI-RS subset comprises:

measuring the Z1 interferences from the Z1 ZP CSI-RSs;

calculating the first CSI from the Z1 interferers.

4. The method according to any of claims 1-3, wherein the configuration information of the first CSI report comprises a type of the first CSI report, and wherein each ZP CSI-RS in the first subset of ZP CSI-RSs is periodically transmitted when the type of the first CSI report is periodic feedback.

5. The method according to any of claims 1-3, wherein the configuration information of the first CSI report comprises a type of first CSI report, and when the type of first CSI report is semi-persistent feedback, each ZP CSI-RS in the first subset of ZP CSI-RSs is periodically transmitted or semi-persistent transmitted.

6. The method of claim 5, further comprising:

receiving first indication information from the network equipment through Downlink Control Information (DCI) or a media access control element (MAC CE), wherein the first indication information triggers the sending of the first CSI.

7. The method according to any of claims 1-6, wherein the configuration information of the first CSI report further comprises offset value information, and the offset value information is used for determining a time domain position for transmitting the first CSI.

8. A method for measuring Channel State Information (CSI) is characterized by comprising the following steps:

transmitting configuration information of a first CSI report to a terminal device, wherein the first CSI report is associated with a first zero power channel state information reference signal (ZP CSI-RS) subset, the first ZP CSI-RS subset comprises Z1 ZP CSI-RSs, and Z1 is an integer greater than or equal to 2;

receiving first CSI from the terminal device, the first CSI being measured according to the first ZP CSI-RS subset.

9. The method of claim 8, wherein the Z1 ZP CSI-RSs are in one-to-one correspondence with Z1 interferers.

10. The method of claim 9, wherein the first CSI is calculated from the Z1 interferers, and wherein the Z1 interferers are measured from the Z1 ZP CSI-RS.

11. The method according to any of claims 8-10, wherein the configuration information of the first CSI report comprises a type of first CSI report, and wherein each ZP CSI-RS in the first subset of ZP CSI-RS is periodically transmitted when the type of first CSI report is periodic feedback.

12. The method according to any of claims 8-10, wherein the configuration information of the first CSI report comprises a type of first CSI report, and wherein each ZP CSI-RS in the first subset of ZP CSI-RS is periodically transmitted or semi-continuously transmitted when the type of first CSI report is semi-continuously feedback.

13. The method of claim 12, further comprising:

and sending first indication information to the terminal equipment through Downlink Control Information (DCI) or a media access control element (MAC CE), wherein the first indication information triggers the sending of the first CSI.

14. The method according to any of claims 8-13, wherein the configuration information of the first CSI report further comprises offset value information, and wherein the offset value information is used for determining a time domain position for transmitting the first CSI.

15. A communications apparatus comprising means for performing the method of any of claims 1-14.

16. A communications device comprising a processor and interface circuitry for receiving and transmitting signals from or sending signals to other communications devices than the communications device, the processor being operable by logic circuitry or executing code instructions to implement the method of any of claims 1 to 14.

17. A computer-readable storage medium, in which a computer program or instructions are stored which, when executed by a communication apparatus, carry out the method of any one of claims 1 to 14.